CN102886309A - Method for sorting bastnaesite concentrate and monazite concentrate from high-grade mixed rare-earth concentrate - Google Patents

Abstract

The invention discloses a method for separating bastnaesite concentrate and monazite concentrate with high-grade mixed rare earth concentrate, and belongs to the technical field of rare earth mineral processing. Process steps: Use the method of fractionation beneficiation to carry out flotation separation of bastnaesite concentrate and monazite concentrate on high-grade mixed rare earth concentrate, and finally obtain fluorine Bastnaesite concentrate with a recovery rate of carnaesite greater than 90% and a purity greater than 95%, and monazite concentrate with a recovery rate and purity of monazite greater than 90%. The adjustment agent used in flotation is aluminum sulfate or alum, the collector is phthalic acid or N-hydroxyphthalimide, and the foaming agent is 2# oil. The raw material used in this method is REO 63~ 70% high-grade mixed rare earth concentrate, the two products obtained after flotation separation can be used as high-quality raw materials for smelting to directly extract rare earths, which can provide a new direction for the reform of the smelting process of mixed rare earth concentrate.

Description

Method for separating bastnaesite concentrate and monazite concentrate with high-grade mixed rare earth concentrate

the

technical field

The invention relates to a method for separating bastnaesite concentrate and monazite concentrate with high-grade mixed rare earth concentrate, and belongs to the technical field of rare earth mineral processing.

Background technique

my country is rich in rare earth resource reserves, and the mixed rare earth resources of bastnaesite and monazite are the main ones. This kind of mixed rare earth resources is enriched through ore dressing to obtain mixed rare earth concentrates. different, but compared with the original ore, the ratio of bastnaesite to monazite has not changed significantly.

The smelting process of mixed rare earth concentrate is basically a concentrated sulfuric acid roasting process. This smelting process was widely used at the beginning of its invention because of its short and continuous process and low requirements for the grade of mixed rare earth concentrate. For a long time, it has been used for The large-scale production of rare earths in my country and the development of rare earth industry have played a major role.

However, in recent years, with the improvement of environmental protection awareness and strict environmental protection requirements, the disadvantage of serious three-waste pollution of this process has become increasingly prominent. On October 1, 2011, the "Discharge Standards for Rare Earth Industrial Pollutants" was officially implemented, and all rare earth smelting enterprises using the concentrated sulfuric acid roasting process have entered the technical transformation period because the three wastes did not meet the standards.

To solve the pollution of the three wastes in the smelting of mixed rare earth concentrates, we should not only start from the improvement and innovation of the smelting process, but also consider the improvement of the smelting process.

In 1978, Baotou Institute of Metallurgy began to conduct research on the separation of bastnaesite and monazite from mixed rare earth ores, and obtained bastnaesite concentrate with a purity of >95% and monazite with a purity >95%. Monazite concentrate, although the two concentrates have higher purity and higher grade, the recovery rate is too low. The highest recovery rate of bastnaesite concentrate is only about 45%, and the recovery rate of monazite is even lower, only 20%. %about.

From the mid-1980s to the early 1990s, the Baotou Iron and Steel Concentrator successively carried out industrial experiments on the separation of bastnaesite and monazite by gravity-selecting rare earth coarse concentrate and strong magnetic medium ore. Single concentrate, but the recovery rate is low, both lower than 30%, and a large amount of mixed rare earth medium ore is also produced.

There are not many patents on the separation of bastnaesite and monazite from mixed rare earth concentrates. The patent 88101129.0 "Ore-dressing process for separation of bastnaesite and monazite by flotation" has obtained relatively pure bastnaesite concentrate and monazite concentrate , but the operational recovery rate is only 60%; Patent 200910060631.1 "A Method for Flotation Separation of Monazite and Bastnaesite from Mixed Rare Earth Concentrate" obtains a relatively high recovery rate of the two concentrates, but there is no clear requirement for purity.

Contents of the invention

The technical problem to be solved in the present invention is to overcome the defects of the prior art and provide a method for separating bastnaesite concentrate and monazite concentrate with high-grade mixed rare earth concentrate. The raw material used is REO 63-70 % high-grade mixed rare earth concentrate, the two products obtained after flotation separation can be used as high-quality raw materials for smelting to directly extract rare earths, which can provide a new direction for the reform of the mixed rare earth concentrate smelting process.

In order to solve the above problems, the present invention adopts the following technical solutions:

The invention provides a method for separating bastnaesite concentrate and monazite concentrate with high-grade mixed rare earth concentrate, comprising the following steps:

(1) Rough selection: Add water to the high-grade mixed rare earth concentrate, adjust the concentration of the pulp, add it to the rougher flotation tank, stir, add regulators, collectors and foaming agents in turn, and conduct rougher selection to obtain For the rougher foam product and the pulp in the rougher tank, the dosage of the rougher agent is added according to the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each rougher: adjuster 3.5~5.5kg/t, collector 1.5~ 4kg/t, foaming agent 0.005-0.03Kg/t, pulp mass concentration 28-50%, pulp temperature 25-55°C, pulp pH 3.5-5.5;

(2) Concentration: Add the roughing foam product to the first-stage beneficiation tank, adjust the concentration of the pulp, stir, and add regulators, collectors and foaming agents in turn for the first-stage beneficiation. The first-stage beneficiation foam product and the pulp in the first-stage beneficiation tank are obtained from the first-stage beneficiation. In the tank selection, adjust the concentration of the pulp, stir, and add regulators, collectors and foaming agents in sequence to carry out the second stage of concentration, and the second stage of concentration can obtain the second stage of selected foam products and the second stage of concentration The pulp in the tank, the pulp in the second-level selection tank is added back to the first-level selection tank, the second-level selection foam product is added to the third-level selection tank, the concentration of the pulp is adjusted, stirred, and added in order to adjust Agents, collectors and foaming agents for the third level of selection, the third level of selection to obtain the third level of selected foam products and the third level of selection tank slurry, the third level of selection tank pulp back In the second-stage beneficiation tank, the third-stage beneficiation foam product is bastnaesite concentrate; the amount of beneficiation agent is added according to the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each roughing: adjuster 1.5～4.0kg/t, collector 1.0～3.0kg/t, foaming agent 0.005～0.02Kg/t, selected pulp mass concentration 28～50%, pulp temperature 25～50℃, pH of pulp 3.5~6.0;

(3) Sweeping: add the ore pulp in the roughing tank obtained by roughing into the first-stage scavenging tank, adjust the concentration of the pulp, stir, and add regulators, collectors and foaming agents in turn to carry out the first-stage Sweeping, first-stage scavenging to obtain the first-stage scavenging foam product and the pulp in the first-stage scavenging tank, the first-stage scavenging foam product is added back to the roughing flotation cell, and the first-stage scavenging tank The inner pulp is added to the second-stage scavenging tank, the concentration of the ore pulp is adjusted, stirred, and the regulator, collector and foaming agent are added in sequence to carry out the second-stage scavenging, and the second-stage scavenging obtains the second-stage scavenging The foam product and the pulp in the second-stage scavenging tank, the second-stage scavenging foam product is added back to the first-stage scavenging tank, and the ore pulp in the second-stage scavenging tank is added to the third-stage scavenging tank to adjust the pulp Concentration, stirring, and adding adjuster, collector and foaming agent in turn to carry out the third stage of scavenging, the third stage of scavenging to obtain the third stage of scavenging foam product and the third stage of scavenging tank pulp, the third stage of scavenging The first-stage scavenging foam product is added back to the second-stage scavenging tank, the pulp in the third-stage scavenging tank is added to the fourth-stage scavenging tank, the concentration of the pulp is adjusted, stirred, and the regulator, collector and Foaming agent, carry out the fourth-level scavenging, the fourth-level scavenging foam product and the pulp in the fourth-level scavenging tank are obtained, and the fourth-level scavenging foam product is added back to the third-level scavenging tank Among them, the ore slurry in the fourth-stage scavenging tank is monazite concentrate; the amount of scavenging agent is added according to the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each roughing: adjuster 0 ~ 3.0kg/t, The collector is 0.5-2.5kg/t, the foaming agent is 0.005-0.03Kg/t, the mass concentration of the pulp is 20-45%, the temperature of the pulp is 20-50℃, and the pH of the pulp is 3.5-6.0.

The high-grade mixed rare earth concentrate is REO grade 63-70%, and the ratio of bastnaesite to monazite is 1:0.25-0.8.

The regulator is alum or aluminum sulfate.

The collector is phthalic acid or N-hydroxyphthalimide.

Described foaming agent is No. 2 oil.

The present invention has the following advantages:

The present invention adopts the method of fractionation beneficiation to carry out flotation separation of bastnaesite concentrate and monazite concentrate on high-grade mixed rare earth concentrate, the method is simple, the flotation agent used is cheap and easy to obtain, and the output of the whole process is only two A kind of concentrate product, no other middle ore and tailings, high operation recovery rate, less loss of rare earth, and can also ensure high purity and high recovery rate of bastnaesite concentrate and monazite concentrate.

In addition, the present invention starts from raw materials and solves many problems existing in the current smelting of mixed rare earth concentrates by means of beneficiation, and provides a new direction for the reform of the smelting process of mixed rare earth concentrates.

Description of drawings

Figure 1 is a process flow diagram of the present invention.

Detailed ways

Example 1:

Using mixed rare earth concentrate with a rare earth grade of 65.99% as raw material, it was determined that the bastnaesite REO in the raw material was 46.83%, and the purity was 71.15% (the purity referred to in this example is bastnaesite and solitary The relative purity of these two kinds of minerals, the same below), the monazite REO is 19.16%, and the purity is 28.85%. Utilize the process technology of the present invention to carry out the ore dressing and separation of bastnaesite and monazite. The specific steps are shown in Figure 1 Show:

(1) Rough selection: Add water to the high-grade mixed rare earth concentrate, adjust the mass concentration of the pulp to 39%, add it to the rougher flotation tank, stir, and sequentially press the ratio of the medicament and the high-grade mixed rare earth concentrate added in each roughing The mass ratio is added: alum 3.0kg/t, N-hydroxyphthalimide 3.0kg/t, No. 2 oil 0.03kg/t, for rough separation, the temperature of the pulp is 44°C, and the pH of the pulp is 4.4, Rough separation to obtain the rough separation foam product and the pulp in the rough separation tank;

(2) Concentration: Add the roughing foam product to the first-stage concentrating tank, adjust the mass concentration of the pulp to 36%, stir, and follow the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each roughing in turn Add: 3.0kg/t of alum, 2.5kg/t of N-hydroxyphthalimide, 0.02kg/t of No. 2 oil, the temperature of the pulp is 42°C, the pH of the pulp is 4.5, and the first stage of beneficiation is carried out. The first-level selection obtains the first-level selected foam product and the pulp in the first-level selection tank, and the pulp in the first-level selection tank is added back to the roughing tank, and the first-level selected foam product is added to the second In the first-grade concentration tank, adjust the mass concentration of the pulp to 33%, stir, and add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: alum 2.5kg/t, N-hydroxy phthalo Imide 2.0kg/t, No. 2 oil 0.02kg/t, pulp temperature is 40°C, pulp pH is 4.6, the second-stage beneficiation is carried out, and the second-stage beneficiation obtains the second-stage beneficiation foam product and the second-stage beneficiation The pulp in the second-stage selection tank, the pulp in the second-level selection tank is added back to the first-level selection tank, the second-level selection foam product is added to the third-level selection tank, and the mass concentration of the pulp is adjusted to 30 %, stir, and add in order according to the mass ratio of the agent and the high-grade mixed rare earth concentrate added in each roughing: alum 2.0kg/t, N-hydroxyphthalimide 1.0kg/t, No. 2 oil 0.02 kg/t, the temperature of the pulp is 36°C, and the pH of the pulp is 4.7, the third stage of beneficiation is carried out, and the third stage of beneficiation is used to obtain the third stage of beneficiation foam product and the pulp in the third stage of beneficiation tank, the third stage of beneficiation The pulp in the selection tank is added back to the second-level selection tank, and the third-level selection foam product is bastnaesite concentrate;

(3) Sweeping: Add the ore pulp in the roughing tank obtained by roughing into the first-stage sweeping tank, adjust the mass concentration of the pulp to 38%, stir, and sequentially press the medicament and the high-grade mixed rare earth added in each roughing The mass ratio of the concentrate is added: alum 2.5kg/t, N-hydroxyphthalimide 2.5kg/t, No. 2 oil 0.02kg/t, the temperature of the pulp is 43°C, and the pH of the pulp is 3.9. First-stage scavenging, the first-stage scavenging obtains the first-stage scavenging foam product and the pulp in the first-stage scavenging tank, and the first-stage scavenging foam product is added back to the rougher flotation cell, and the first-stage scavenging foam product Add the pulp in the selection tank to the second-stage sweeping tank, adjust the mass concentration of the pulp to 37%, stir, and add in turn according to the mass ratio of the agent and the high-grade mixed rare earth concentrate added in each roughing: alum 2.0kg/t , N-hydroxyphthalimide 2.0kg/t, No. 2 oil 0.02kg/t, the temperature of the pulp is 43°C, the pH of the pulp is 3.9, and the second-stage scavenging is carried out, and the second-stage scavenging obtains the No. The second-stage scavenging foam product and the pulp in the second-stage scavenging tank, the second-stage scavenging foam product is added back to the first-stage scavenging tank, and the pulp in the second-stage scavenging tank is added to the third-stage scavenging tank During the process, adjust the mass concentration of the pulp to 33%, stir, and add in turn according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: alum 1.0kg/t, N-hydroxyphthalimide 1.0 kg/t, No. 2 oil 0.02kg/t, the temperature of the pulp is 40°C, the pH of the pulp is 4.0, and the third-stage scavenging is carried out, and the third-stage scavenging foam product and the third-stage scavenging are obtained The slurry in the tank, the third-level scavenging foam product is added back to the second-level scavenging tank, the ore slurry in the third-level scavenging tank is added to the fourth-level scavenging tank, and the mass concentration of the pulp is adjusted to 28%, stirring, Sequentially add according to the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each roughing: N-hydroxyphthalimide 0.8kg/t, No. 2 oil 0.03kg/t, the slurry temperature is 30°C, The pH of the pulp is 5.5, and the fourth-stage scavenging is carried out. The fourth-stage scavenging foam product and the ore pulp in the fourth-stage scavenging tank are obtained from the fourth-stage scavenging. The fourth-stage scavenging foam product is added to the third-stage scavenging In the selection tank, the slurry in the fourth-stage scavenging tank is monazite concentrate.

After determination: bastnaesite concentrate REO is 69.31%, relative purity 96.2%, recovery rate 93.5%, monazite concentrate REO is 60.08%, relative purity 90.4%, recovery rate 90.3%.

Example 2:

Using mixed rare earth concentrate with a rare earth grade of 64.55% as raw material, it was determined that the bastnaesite REO in the raw material was 43.23%, and the purity was 66.24% (the purity referred to in this example is bastnaesite and solitary The relative purity of these two kinds of minerals, the same below), the monazite REO is 21.22%, and the purity is 33.76%. Utilize the process technology of the present invention to carry out the mineral separation of bastnaesite and monazite, the specific steps are shown in Figure 1 Show:

(1) Rough separation: Add water to the high-grade mixed rare earth concentrate, adjust the mass concentration of the pulp to 48%, add it to the rougher flotation cell, stir, and follow the ratio of the medicament and the high-grade mixed rare earth concentrate added to each roughing in turn. The mass ratio is added: alum 5.5kg/t, phthalic acid 3.8kg/t, No. 2 oil 0.03kg/t, for rough separation, the temperature of the pulp and pulp is 53°C, and the pH of the pulp is 3.7, rough separation to obtain rough separation foam Product and slurry in rougher tank;

(2) Concentration: Add the roughing foam product to the first-stage concentrating tank, adjust the mass concentration of the pulp to 44%, stir, and follow the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing in turn Add: 3.3kg/t of alum, 2.8kg/t of phthalic acid, 0.005kg/t of No. 2 oil, the temperature of the pulp is 50°C, the pH of the pulp is 3.6, and the first-stage beneficiation is carried out, and the first-stage beneficiation is obtained The first-stage selected foam product and the pulp in the first-stage selected tank, the pulp in the first-stage selected tank is added to the rougher tank, and the first-stage selected foam product is added to the second-stage selected tank, Adjust the mass concentration of the pulp to 42%, stir, and add in order according to the mass ratio of the chemical agent and the high-grade mixed rare earth concentrate added in each roughing: alum 2.0kg/t, phthalic acid 1.8kg/t, No. 2 oil 0.005 kg/t, the temperature of the pulp is 47°C, and the pH of the pulp is 3.9, the second stage of concentration is carried out, and the second stage of concentration is obtained to obtain the second stage of selected foam products and the pulp in the second stage of concentration tank, and the second stage of concentration The ore pulp in the selection tank is added back to the first-level selection tank, and the second-level selection foam product is added to the third-level selection tank, and the mass concentration of the pulp is adjusted to 28%. The mass ratio of the high-grade mixed rare earth concentrate added: 1.5kg/t of alum, 1.0kg/t of phthalic acid, 0.02kg/t of No. Three-stage selection, the third-stage selection obtains the third-stage selected foam product and the pulp in the third-stage selection tank, and the pulp in the third-stage selection tank is added back to the second-stage selection tank, and the third-stage selection tank The selected foam product is bastnaesite concentrate;

(3) Sweeping: Add the ore pulp in the roughing tank obtained by roughing into the first-stage sweeping tank, adjust the mass concentration of the pulp to 43%, stir, and sequentially press the medicament and the high-grade mixed rare earth added in each roughing The mass ratio of the concentrate is added: alum 1.0kg/t, phthalic acid 2.5kg/t, No. 2 oil 0.015kg/t, the pulp temperature is 48°C, and the pH of the pulp is 3.6. The first-stage scavenging foam product and the pulp in the first-stage scavenging tank are obtained by the first-stage scavenging. In the second-stage scavenging tank, adjust the mass concentration of the pulp to 35%, stir, and add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: 0.5kg/t of alum, 1.8% of phthalic acid kg/t, No. 2 oil 0.01kg/t, the temperature of the pulp is 46°C, the pH of the pulp is 3.8, the second-stage scavenging is carried out, and the second-stage scavenging foam product and the second-stage scavenging are obtained The pulp in the tank, the second-stage scavenging foam product is added back to the first-stage scavenging tank, the ore pulp in the second-stage scavenging tank is added to the third-stage scavenging tank, and the mass concentration of the pulp is adjusted to 30%, and stirred. Add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: phthalic acid 1.0kg/t, No. 2 oil 0.01kg/t, the temperature of the pulp is 42°C, the pH of the pulp is 4.2, Carry out the third-level scavenging, the third-level scavenging foam product and the pulp in the third-level scavenging tank are obtained by the third-level scavenging, the third-level scavenging foam product is added back to the second-level scavenging tank, and the third-level scavenging tank Add the ore pulp in the first-stage scavenging tank to the fourth-stage scavenging tank, adjust the mass concentration of the ore pulp to 23%, stir, and add in turn according to the mass ratio of the medicament and the high-grade mixed rare earth concentrate added in each roughing: phthalate Formic acid 0.5kg/t, No. 2 oil 0.01kg/t, pulp temperature 40°C, pulp pH 4.5, carry out fourth-stage scavenging, and fourth-stage scavenging obtains fourth-stage scavenging foam products and fourth-stage The slurry in the scavenging tank, the fourth-stage scavenging foam product is added back to the third-stage scavenging tank, and the ore pulp in the fourth-stage scavenging tank is monazite concentrate.

After determination: bastnaesite concentrate REO is 67.89%, relative purity 95.2%, recovery rate 92.8%, monazite concentrate REO is 59.32%, relative purity 90.2%, recovery rate 91.2%.

Example 3:

Using the mixed rare earth concentrate with a rare earth grade of 63.11% as raw material, it was determined that the bastnaesite REO in the raw material was 39.98%, and the purity was 63.33% (the purity referred to in this example refers to bastnaesite and solitary The relative purity of these two kinds of minerals, the same below), the monazite REO is 22.19%, and the purity is 27.67%. Utilize the technology of the present invention to carry out the ore dressing and separation of bastnaesite and monazite. The specific steps are shown in Figure 1 Show:

(1) Rough separation: Add water to the high-grade mixed rare earth concentrate, adjust the mass concentration of the pulp to 48%, add it to the rougher flotation cell, stir, and follow the ratio of the medicament and the high-grade mixed rare earth concentrate added to each roughing in turn. The mass ratio is added: alum 5.5kg/t, phthalic acid 3.8kg/t, No. 2 oil 0.03kg/t, for rough separation, the temperature of the pulp and pulp is 53°C, and the pH of the pulp is 3.7, rough separation to obtain rough separation foam Product and slurry in rougher tank;

(2) Concentration: Add the roughing foam product to the first-stage concentrating tank, adjust the mass concentration of the pulp to 44%, stir, and follow the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing in turn Add: 3.3kg/t of alum, 2.8kg/t of phthalic acid, 0.005kg/t of No. 2 oil, the temperature of the pulp is 50°C, the pH of the pulp is 3.6, and the first-stage beneficiation is carried out, and the first-stage beneficiation is obtained The first-stage selected foam product and the pulp in the first-stage selected tank, the pulp in the first-stage selected tank is added to the rougher tank, and the first-stage selected foam product is added to the second-stage selected tank, Adjust the mass concentration of the pulp to 42%, stir, and add in order according to the mass ratio of the chemical agent and the high-grade mixed rare earth concentrate added in each roughing: alum 2.0kg/t, phthalic acid 1.8kg/t, No. 2 oil 0.005 kg/t, the temperature of the pulp is 47°C, and the pH of the pulp is 3.9, the second stage of concentration is carried out, and the second stage of concentration is obtained to obtain the second stage of selected foam products and the pulp in the second stage of concentration tank, and the second stage of concentration The ore pulp in the selection tank is added back to the first-level selection tank, and the second-level selection foam product is added to the third-level selection tank, and the mass concentration of the pulp is adjusted to 28%. The mass ratio of the high-grade mixed rare earth concentrate added: 1.5kg/t of alum, 1.0kg/t of phthalic acid, 0.02kg/t of No. Three-stage selection, the third-stage selection obtains the third-stage selected foam product and the pulp in the third-stage selection tank, and the pulp in the third-stage selection tank is added back to the second-stage selection tank, and the third-stage selection tank The selected foam product is bastnaesite concentrate;

(3) Sweeping: Add the ore pulp in the roughing tank obtained by roughing into the first-stage sweeping tank, adjust the mass concentration of the pulp to 43%, stir, and sequentially press the medicament and the high-grade mixed rare earth added in each roughing The mass ratio of the concentrate is added: alum 1.0kg/t, phthalic acid 2.5kg/t, No. 2 oil 0.015kg/t, the pulp temperature is 48°C, and the pH of the pulp is 3.6. The first-stage scavenging foam product and the pulp in the first-stage scavenging tank are obtained by the first-stage scavenging. In the second-stage scavenging tank, adjust the mass concentration of the pulp to 35%, stir, and add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: 0.5kg/t of alum, 1.8% of phthalic acid kg/t, No. 2 oil 0.01kg/t, the temperature of the pulp is 46°C, the pH of the pulp is 3.8, the second-stage scavenging is carried out, and the second-stage scavenging foam product and the second-stage scavenging are obtained The pulp in the tank, the second-stage scavenging foam product is added back to the first-stage scavenging tank, the ore pulp in the second-stage scavenging tank is added to the third-stage scavenging tank, and the mass concentration of the pulp is adjusted to 30%, and stirred. Add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: phthalic acid 1.0kg/t, No. 2 oil 0.01kg/t, the temperature of the pulp is 42°C, the pH of the pulp is 4.2, Carry out the third-level scavenging, the third-level scavenging foam product and the pulp in the third-level scavenging tank are obtained by the third-level scavenging, the third-level scavenging foam product is added back to the second-level scavenging tank, and the third-level scavenging tank Add the ore pulp in the first-stage scavenging tank to the fourth-stage scavenging tank, adjust the mass concentration of the ore pulp to 23%, stir, and add in turn according to the mass ratio of the medicament and the high-grade mixed rare earth concentrate added in each roughing: phthalate Formic acid 0.5kg/t, No. 2 oil 0.01kg/t, pulp temperature 40°C, pulp pH 4.5, carry out fourth-stage scavenging, and fourth-stage scavenging obtains fourth-stage scavenging foam products and fourth-stage The slurry in the scavenging tank, the fourth-stage scavenging foam product is added back to the third-stage scavenging tank, and the ore pulp in the fourth-stage scavenging tank is monazite concentrate.

After determination: bastnaesite concentrate REO is 67.63%, relative purity 96.5%, recovery rate 92.8%, monazite concentrate REO is 58.81%, relative purity 90.5%, recovery rate 90.3%.

Example 4:

Using the mixed rare earth concentrate with a rare earth grade of 68.93% as the raw material, it has been determined that the bastnaesite REO in the raw material is 52.19%, and the purity is 75.83% (the purity referred to in this example is bastnaesite and solitary The relative purity of these two kinds of minerals, the same below), the monazite REO is 16.74%, and the purity is 24.17%. Utilize the technology of the present invention to carry out the ore dressing and separation of bastnaesite and monazite. The specific steps are shown in Figure 1 Show:

(1) Rough separation: Add water to the high-grade mixed rare earth concentrate, adjust the mass concentration of the pulp to 33%, add it to the rougher flotation tank, stir, and sequentially press the ratio of the reagent and the high-grade mixed rare earth concentrate added in each roughing The mass ratio is added: aluminum sulfate 5.0kg/t, phthalic acid 4.0kg/t, No. 2 oil 0.02kg/t, rough separation, the temperature of the pulp and pulp is 28°C, and the pH of the pulp is 4.6, rough separation is rough separation Foam products and pulp in rougher tanks;

(2) Concentration: Add the roughing foam product to the first-stage concentrating tank, adjust the mass concentration of the pulp to 30%, stir, and follow the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each roughing in turn Add: 3.6kg/t of aluminum sulfate, 2.6kg/t of phthalic acid, 0.015kg/t of No. 2 oil, the temperature of the pulp is 27°C, the pH of the pulp is 4.8, and the first stage of selection is carried out. Get the first-stage selected foam product and the pulp in the first-stage selected tank, the pulp in the first-stage selected tank is added back to the roughing tank, and the first-stage selected foam product is added to the second-stage selected tank , adjust the mass concentration of the pulp to 28%, stir, and add in order according to the mass ratio of the medicament and the high-grade mixed rare earth concentrate added in each roughing: aluminum sulfate 1.8kg/t, phthalic acid 2.3kg/t, No. The oil is 0.01kg/t, the temperature of the pulp is 28°C, and the pH of the pulp is 4.9. The second stage of concentration is carried out, and the second stage of concentration is used to obtain the second stage of selected foam products and the pulp in the second stage of concentration tank. The ore pulp in the first-stage selection tank is added back to the first-level selection tank, and the second-level selection foam product is added to the third-level selection tank, and the mass concentration of the pulp is adjusted to 28%. The mass ratio of the high-grade mixed rare earth concentrate added in roughing: aluminum sulfate 1.5kg/t, phthalic acid 1.5kg/t, No. 2 oil 0.02kg/t, pulp temperature 28°C, pulp pH 5.4 , carry out the third level of selection, the third level of selection to get the third level of selection foam product and the pulp in the third level of selection tank, the pulp in the third level of selection tank is added back to the second level of selection tank, The third grade selected foam product is bastnaesite concentrate;

(3) Sweeping: Add the ore pulp in the roughing tank obtained by roughing into the first-stage sweeping tank, adjust the mass concentration of the pulp to 43%, stir, and sequentially press the medicament and the high-grade mixed rare earth added in each roughing The mass ratio of the concentrate is added: aluminum sulfate 0.8kg/t, phthalic acid 2.0kg/t, No. 2 oil 0.015kg/t, the temperature of the pulp is 28°C, the pH of the pulp is 4.6, and the first-stage sweeping is carried out. The first-stage scavenging produces the first-stage scavenging foam product and the pulp in the first-stage scavenging tank. In the second-stage scavenging tank, adjust the mass concentration of the pulp to 27%, stir, and add in sequence according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: phthalic acid 1.5kg/t, di No. oil is 0.015kg/t, the pulp temperature is 26°C, and the pH of the pulp is 4.8, and the second-stage scavenging is carried out. The second-stage scavenging obtains the second-stage scavenging foam product and the ore pulp in the second-stage scavenging tank. The secondary scavenging foam product is added back to the first-stage scavenging tank, and the pulp in the second-stage scavenging tank is added to the third-stage scavenging tank, and the mass concentration of the pulp is adjusted to 24%. The mass ratio of the high-grade mixed rare earth concentrate added in the sub-roughing is: 0.8kg/t of phthalic acid, 0.01kg/t of No. The third-level scavenging foam product and the pulp in the third-level scavenging tank are obtained by the third-level scavenging, and the third-level scavenging foam product is added back to the second-level scavenging tank, and the third-level scavenging tank Put the ore pulp into the fourth-stage scavenging tank, adjust the mass concentration of the ore pulp to 20%, stir, and add in turn according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: phthalic acid 0.5kg/t , No. 2 oil 0.01kg/t, the temperature of the pulp is 25°C, and the pH of the pulp is 5.9, and the fourth-stage scavenging is carried out, and the fourth-stage scavenging foam product and the pulp in the fourth-stage scavenging tank are obtained , the fourth-stage scavenging foam product is added back to the third-stage scavenging tank, and the slurry in the fourth-stage scavenging tank is monazite concentrate.

After determination: bastnaesite concentrate REO is 71.71%, relative purity 98.1%, recovery rate 93.5%, monazite concentrate REO is 64.63%, relative purity 92.1%, recovery rate 91.7%.

Example 5:

Using the mixed rare earth concentrate with a rare earth grade of 67.43% as raw material, it was determined that the bastnaesite REO in the raw material was 47.88%, and the purity was 72.14% (the purity referred to in this example is bastnaesite and solitary The relative purity of these two kinds of minerals, the same below), the monazite REO is 19.55%, and the purity is 27.86%. Utilize the technology of the present invention, carry out the ore dressing and separation of bastnaesite and monazite, the specific steps are as shown in Figure 1 Show:

(1) Rough selection: add water to the high-grade mixed rare earth concentrate, adjust the mass concentration of the pulp to 43%, add it to the rougher flotation tank, stir, and follow the ratio of the medicament and the high-grade mixed rare earth concentrate added in each roughing The mass ratio is added: aluminum sulfate 4.0kg/t, N-hydroxyphthalimide 3.3kg/t, No. 2 oil 0.02kg/t, for rough separation, the temperature of the pulp is 46°C, and the pH of the pulp is 4.4 , roughing to obtain the roughing foam product and the pulp in the roughing tank;

(2) Concentration: Add the roughing foam product to the first-stage concentrating tank, adjust the mass concentration of the pulp to 39%, stir, and follow the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing in turn Add: Aluminum Sulfate 2.0kg/t, N-Hydroxyphthalimide 1.5kg/t, No. 2 Oil 0.02kg/t, pulp temperature is 44℃, pulp pH is 4.9, carry out the first stage selection , the first-level selection obtains the first-level selected foam product and the pulp in the first-level selection tank, the pulp in the first-level selection tank is added back to the roughing tank, and the first-level selected foam product is added to the second-level selection tank In the secondary concentrating tank, adjust the mass concentration of the pulp to 33%, stir, and add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: aluminum sulfate 1.5kg/t, N-hydroxy phthalate Dicarboximide 1.0kg/t, No. 2 oil 0.02kg/t, pulp temperature is 43°C, pulp pH is 5.1, the second-stage selection is carried out, and the second-stage selection is used to obtain the second-stage selected foam product and the pulp in the second-stage selection tank, the pulp in the second-stage selection tank is added back to the first-stage selection tank, and the second-stage selection foam product is added to the third-stage selection tank to adjust the mass concentration of the pulp 30%, stirring, followed by adding according to the mass ratio of the agent and the high-grade mixed rare earth concentrate added in each roughing: aluminum sulfate 1.5kg/t, N-hydroxyphthalimide 1.0kg/t, di No. oil is 0.02kg/t, pulp temperature is 37°C, and pulp pH is 5.4. The third stage of beneficiation is carried out, and the third stage beneficiation obtains the third stage beneficiation foam product and the ore pulp in the third stage beneficiation tank. The ore slurry in the third-stage beneficiation tank is added back to the second-stage beneficiation tank, and the foam product of the third-stage beneficiation is bastnaesite concentrate;

(3) Sweeping: Add the ore pulp in the roughing tank obtained by roughing into the first-stage sweeping tank, adjust the mass concentration of the pulp to 36%, stir, and sequentially press the medicament and the high-grade mixed rare earth added in each roughing The mass ratio of the concentrate is added: aluminum sulfate 1.0kg/t, N-hydroxyphthalimide 1.5kg/t, No. 2 oil 0.02kg/t, the pulp temperature is 40°C, and the pH of the pulp is 4.9. The first-stage scavenging, the first-stage scavenging obtains the first-stage scavenging foam product and the pulp in the first-stage scavenging tank, and the first-stage scavenging foam product is added back to the roughing flotation cell, and the first-stage Add the pulp in the scavenging tank to the second-stage scavenging tank, adjust the mass concentration of the pulp to 30%, stir, and add in turn according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: 0.8kg of aluminum sulfate /t, N-hydroxyphthalimide 1.5kg/t, No. 2 oil 0.02kg/t, the temperature of the pulp is 43°C, the pH of the pulp is 5.3, and the second-stage sweeping is carried out. The second-stage scavenging foam product and the pulp in the second-stage scavenging tank are obtained, the second-stage scavenging foam product is added back to the first-stage scavenging tank, and the ore pulp in the second-stage scavenging tank is added to the third-stage scavenging tank In the tank selection, adjust the mass concentration of the pulp to 33%, stir, and add in order according to the mass ratio of the medicament to the high-grade mixed rare earth concentrate added in each roughing: aluminum sulfate 0.3kg/t, N-hydroxyphthaloyl Imine 1.5kg/t, No. 2 oil 0.02kg/t, pulp temperature 40°C, pulp pH 5.5, third-stage scavenging, third-stage scavenging to obtain third-stage scavenging foam products and third-stage scavenging The slurry in the first-level scavenging tank, the third-level scavenging foam product is added back to the second-level scavenging tank, the ore slurry in the third-level scavenging tank is added to the fourth-level scavenging tank, and the mass concentration of the ore pulp is adjusted to 30% , stirred, and added in turn according to the mass ratio of the agent to the high-grade mixed rare earth concentrate added in each roughing: N-hydroxyphthalimide 1.5kg/t, No. 2 oil 0.01kg/t, the pulp temperature is 37°C, the pH of the pulp is 5.8, and the fourth-stage scavenging is carried out. The fourth-stage scavenging foam product and the pulp in the fourth-stage scavenging tank are obtained from the fourth-stage scavenging. The fourth-stage scavenging foam product is added back to the In the three-stage scavenging tank, the slurry in the fourth-stage scavenging tank is monazite concentrate.

After determination: bastnaesite concentrate REO is 69.77%, relative purity 96.0%, recovery rate 92.2%, monazite concentrate REO is 60.29%, relative purity 90.3%, recovery rate 90.6%.

Finally, it should be noted that obviously, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims (5)

1. the method for a high-grade mixed rare earth concentrates sorting fluoro-carbon-cerium ore concentrate and monazite concentrate is characterized in that, comprises the following steps:

(1) roughly selects: the high-grade mixed rare earth concentrates is added water, after adjusting pulp density, add in the rougher cell, stir, add successively adjusting agent, collecting agent and foaming agent, roughly select, roughly select and obtain roughly selecting ore pulp in froth pulp and the initial separatory cell, roughly selecting the medicament addition adds by the mass ratio of medicament with the high-grade mixed rare earth concentrates of roughly selecting adding at every turn: adjusting agent 3.5～5.5kg/t, collecting agent 1.5～4kg/t, foaming agent 0.005～0.03Kg/t, the ore pulp mass concentration is 28～50%, slurry temperature is 25～55 ℃, and the pH of ore pulp is 3.5～5.5;

(2) selected: as will to roughly select froth pulp and join in the first order cleaner cell, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent, carry out the first order selected, the selected selected froth pulp of the first order and the interior ore pulp of first order cleaner cell of obtaining of the first order, ore pulp returns and is added in the initial separatory cell in the first order cleaner cell, the selected froth pulp of the first order joins in the cleaner cell of the second level, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent, carry out the second level selected, the selected selected froth pulp in the second level and the interior ore pulp of second level cleaner cell of obtaining in the second level, ore pulp returns and is added in the first order cleaner cell in the cleaner cell of the second level, the selected froth pulp in the second level joins in the third level cleaner cell, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent, carry out the third level selected, the selected selected froth pulp of the third level and the interior ore pulp of third level cleaner cell of obtaining of the third level, ore pulp returns and is added in the cleaner cell of the second level in the third level cleaner cell, and the selected froth pulp of the third level is fluoro-carbon-cerium ore concentrate; Selected medicament addition adds by the mass ratio of medicament with the high-grade mixed rare earth concentrates of roughly selecting adding at every turn: adjusting agent 1.5～4.0kg/t, collecting agent 1.0～3.0kg/t, foaming agent 0.005～0.02Kg/t, selected ore pulp mass concentration is 28～50%, slurry temperature is 25～50 ℃, and the pH of ore pulp is 3.5～6.0;

(3) scan: will roughly select the interior ore pulp of the initial separatory cell that obtains and join in the first order scavenger flotation cell, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent, carrying out the first order scans, the first order is scanned and is obtained the first order and scan ore pulp in froth pulp and the first order scavenger flotation cell, the first order is scanned froth pulp and is returned and be added in the rougher cell, ore pulp in the first order scavenger flotation cell is joined in the scavenger flotation cell of the second level, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent, carrying out the second level scans, the second level is scanned to such an extent that scan ore pulp in froth pulp and the second level scavenger flotation cell to the second level, the second level is scanned froth pulp and is returned and be added in the first order scavenger flotation cell, ore pulp joins in the third level scavenger flotation cell in the scavenger flotation cell of the second level, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent, carrying out the third level scans, the third level is scanned and obtains the third level and scan ore pulp in froth pulp and the third level scavenger flotation cell, the third level is scanned froth pulp and returns and be added in the scavenger flotation cell of the second level, ore pulp joins in the fourth stage scavenger flotation cell in the third level scavenger flotation cell, adjust pulp density, stir, and add successively adjusting agent, collecting agent and foaming agent carry out the fourth stage and scan, and the fourth stage is scanned and obtained the fourth stage and scan ore pulp in froth pulp and the fourth stage scavenger flotation cell, the fourth stage is scanned froth pulp and is returned and be added in the third level scavenger flotation cell, and ore pulp is monazite concentrate in the fourth stage scavenger flotation cell; Scanning the medicament addition adds by the mass ratio of medicament with the high-grade mixed rare earth concentrates of roughly selecting adding at every turn: adjusting agent 0～3.0kg/t, collecting agent 0.5～2.5kg/t, foaming agent 0.005～0.03Kg/t, the ore pulp mass concentration of scanning is 20～45%, slurry temperature is 20～50 ℃, and the pH of ore pulp is 3.5～6.0.

2. a kind of high-grade mixed rare earth concentrates according to claim 1 separates the beneficiation method of bastnaesite and monazite, it is characterized in that: described a kind of high-grade mixed rare earth concentrates is REO grade 63～70%, and the ratio of bastnaesite and monazite is 1: 0.25 ~ 0.8 mixed rare earth concentrates.

3. the method for a kind of high-grade mixed rare earth concentrates sorting fluoro-carbon-cerium ore concentrate according to claim 1 and monazite concentrate, it is characterized in that: described adjusting agent is alum or aluminum sulfate.

4. the method for a kind of high-grade mixed rare earth concentrates sorting fluoro-carbon-cerium ore concentrate according to claim 1 and monazite concentrate, it is characterized in that: described collecting agent is phthalic acid or HP.

5. the method for a kind of high-grade mixed rare earth concentrates sorting fluoro-carbon-cerium ore concentrate according to claim 1 and monazite concentrate, it is characterized in that: described foaming agent is No. two oil.

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