CN102357401B - Beneficiation method for separating potash feldspar ore concentrate and iron ore concentrate from Baiyunebo potassium-enriched slate - Google Patents

Abstract

The invention relates to a beneficiation method for separating potassium feldspar concentrate and iron concentrate from Baiyun Obo potassium-rich slate, belonging to the technical field of beneficiation technology. The present invention comprises the following steps: reverse flotation: after reverse flotation, potassium-rich slate with a particle size of -200 mesh accounts for more than 90% to obtain flotable mineral foam and pulp rich in potassium feldspar; strong magnetic separation: reverse Potassium feldspar enrichment obtained by flotation is subjected to strong magnetic separation to further improve the purity of potassium feldspar; weak magnetic separation: the easy-floating minerals obtained by reverse flotation and magnetic minerals obtained by strong magnetic separation are combined for weak magnetic separation to obtain Iron concentrate; Positive flotation: Perform positive flotation on the non-magnetic minerals obtained by strong magnetic separation, and finally obtain high-purity potassium feldspar concentrate. The process is scientific and reasonable, and potassium feldspar concentrate with a purity of over 98% and a recovery rate of over 85% and iron concentrate with a total iron grade of over 65% and a recovery rate of over 95% can be obtained.

Description

Mineral processing method for separating potassium feldspar concentrate and iron concentrate from Baiyan Obo potassium-rich slate

technical field

The invention relates to a beneficiation process for separating potassium feldspar concentrate and iron concentrate from Baiyun Obo potassium-rich slate, and belongs to the technical field of beneficiation process.

Background technique

The surrounding rock distributed in the hanging wall of the Bozhu and Dong Mine in Baiyue is a layer of potassium-rich slate mainly composed of potassium feldspar. The content of potassium feldspar in the potassium-rich slate is about 65%, and more than 4.5% of magnetite. Among them, the content of potassium oxide in potassium feldspar accounts for more than 11% of the entire potassium-rich slate, and the content of alumina is also more than 16%. The reserves of this kind of potassium-rich slate in Baiyun Obo are huge, and the reserves of potassium-rich slate in the mining area of the main and eastern mines in Baiyuebo alone reach more than 300 million tons. More importantly, for a long time due to technological reasons, the potassium-rich slate has been dumped in vain only as waste rocks for mining iron ore and rare earth minerals. The annual stripping and dumping volume is about 4 million tons, resulting Serious waste of resources and energy.

Potassium feldspar is the main mineral in Baiyan Obo potassium-rich slate, and potassium feldspar is a mineral with a wide range of uses. It is widely used in industrial sectors such as ceramic blanks, ceramic glazes, glass, electric porcelain, and abrasive materials. In addition, Baiyun Obo potassium-rich slate is rich in potassium and aluminum elements, and the industrial products of potassium and aluminum can be extracted directly through metallurgical methods. In these respects, predecessors have also done research on Baiyun Obo potassium-rich slate, including producing potassium fertilizer from Baiyun Obo potassium-rich slate; using Baiyun Obo potassium-rich slate to synthesize zeolite molecular sieves, and extract potassium carbonate and white carbon Hei; even semi-industrial expansion experiments have been carried out on the process of preparing alumina and potassium carbonate from Baiyun Obo potassium-rich slate. However, it is a pity that none of these processes has been put into production in industry so far. On the one hand, this shows that potassium-rich slate can indeed be developed and utilized; on the other hand, it also shows that it is impossible to directly use potassium feldspar and other minerals from potassium-rich slate due to the lack of purity of a single mineral. Therefore, the method of concentrate must be adopted, that is, the useful minerals in the potassium-rich slate must be separated by means of beneficiation.

The present invention is based on comprehensive consideration of the above aspects, using Baiyun Obo potassium-rich slate as a raw material, and adopting the means of beneficiation to obtain potassium feldspar concentrate with a purity of more than 98% and a recovery rate of more than 85%. At the same time, starting from the principle of comprehensive utilization of resources and improving economic benefits, an iron concentrate with a total iron grade of more than 65% and a recovery rate of more than 95% was effectively prepared, paving the way for the subsequent industrialization of Baiyan Obo potassium-rich slate The road has also given Baiyun Obo potassium-rich slate a broad market prospect.

Contents of the invention

The purpose of this invention is to provide a kind of beneficiation method for separating potassium feldspar concentrate and iron ore concentrate from Baiyun Obo potassium-rich slate, which can make Baiyunebo potassium-rich slate reasonably and effectively utilized, with simple process and low production cost Low, high-grade and high recovery rate of potassium feldspar concentrate and iron concentrate can be obtained, which realizes the effective utilization of resources.

The object of the present invention is achieved by the following process steps.

(1) Reverse flotation: Using potassium-rich slate with a particle size of -200 mesh and accounting for more than 90% as raw material, reverse flotation is carried out. The ore and scavenging concentrate return to the roughing tank to continue roughing. The reagent system: the inhibitor is water glass, the collector is fatty acid collector, and the foaming agent is No. 2 oil. During the reverse flotation process, the pulp The mass concentration of the slurry is 30% to 50%, the pH of the slurry is 8 to 10, the temperature of the slurry is 18 to 35°C, and the amount of roughing agent added is calculated by weight ratio: inhibitor 0.5 ~ 2.0Kg/t, collector 1.5 ~ 4.5Kg/t, foaming agent 0.005～0.02Kg/t, selection and sweeping agents added by weight ratio: inhibitor 0.5～1.5Kg/t, collector 1.0～3.0Kg/t, foaming agent 0～0.015Kg/t, the foam obtained by reverse flotation is easy floating tailings, and the pulp is concentrate rich in potassium feldspar;

(2) Strong magnetic separation: Perform strong magnetic separation on the concentrate rich in potassium feldspar obtained from reverse flotation to obtain two products: magnetic minerals and non-magnetic minerals rich in potassium feldspar, with a magnetic field strength of 1.0-1.2T ;

(3) Weak magnetic separation: Weak magnetic separation is carried out on the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation. The tailings and scavenging concentrates are returned and combined for roughing. The magnetic field strength for roughing is 0.2-0.26T, and the magnetic field strength for beneficiation and scavenging is 0.17-0.2T. Finally, iron concentrate and scavenging tailings are obtained. ;

(4) Positive flotation: Positive flotation is carried out on the non-magnetic minerals rich in potassium feldspar obtained by strong magnetic separation, and the selected tailings and scavenging concentrate are separated by one roughing, one beneficiation and one scavenging. Return to the roughing tank to continue the roughing. The reagents used in the positive flotation: the regulator is sulfuric acid or hydrofluoric acid, the collector is an amine collector, and the No. 2 oil is a foaming agent. system. In the process of positive flotation, the mass concentration of the pulp is 30% to 50%, the pH value of the pulp is 2 to 3, the temperature of the pulp is 18 to 35°C, and the amount of roughing agent added is calculated by weight ratio: collector 1.5 to 4.5Kg/t, foaming agent 0.005～0.02Kg/t, selection and scavenging reagents added by weight ratio: collector 1.0～3.0Kg/t, foaming agent 0.005～0.015Kg/t, positive buoyancy The foam product obtained after separation is the final potassium feldspar concentrate, and the pulp in the flotation tank is tailings.

The potassium feldspar purity in the potassium-rich slate is 50-70%, and the magnetite grade is 3.5-8%.

The fatty acid collector is one of oleic acid, tall oil, naphthenic acid and oxidized paraffin.

The amine collector is one of dodecylamine, octadecylamine, mixed amines and trialkylamines.

The present invention has the following advantages:

1. Using Baiyun Obo potassium-rich slate as raw material, a joint beneficiation process combining magnetic separation and flotation for preparing potassium feldspar concentrate and iron concentrate was invented. Potassium feldspar concentrate with a purity of more than 98% and a recovery rate of 85% and iron concentrate with a total iron grade of more than 65% and a recovery rate of more than 95% are obtained.

2. Strong magnetic separation of the potassium-feldspar-rich slurry obtained by reverse flotation can effectively remove impurities and improve the purity of potassium feldspar.

3. Weak magnetic separation is only carried out on the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation, which can reduce the mechanical equipment of magnetic separation and select high-quality iron ore concentrate.

4. Designing strong magnetic separation between reverse flotation and forward flotation can effectively reduce the impact of reverse flotation reagents on positive flotation. At the same time, setting positive flotation at the last stage is also beneficial to flotation Stability and comprehensive treatment of wastewater.

Description of drawings

Fig. 1 is a schematic diagram of the process flow of the present invention.

Detailed ways

The following examples further illustrate the technical solution of the present invention, but the content of the present invention is not limited only to the following examples.

Example 1

Using the Baiyun Obo potassium-rich slate with a particle size of -200 mesh accounting for more than 90%, a potassium feldspar content of 64.26%, and a magnetite grade of 6.1% as raw material, the following process steps are carried out by using the process method of the present invention:

1) Reverse flotation: Reverse flotation adopts a process of roughing, one-time beneficiation and one-time sweeping; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings, and the roughing concentrate is subjected to one-time beneficiation. Get the concentrated ore and tailings, carry out a scavenging on the rougher tailings, get the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank and combine them for roughing The inhibitor of reverse flotation is water glass, the collector is naphthenic acid, and the foaming agent is No. 2 oil; in the whole reverse flotation process, the pH value of the pulp is 9.3, and the mass concentration of the pulp is 40%. The temperature of the pulp is 20°C. The addition amount of roughing agents is calculated by weight ratio: water glass 1.8Kg/t, naphthenic acid 3.6Kg/t, No. 2 oil 0.010Kg/t, the addition amount of selection and sweeping agents is calculated by weight ratio: water glass 1.2Kg /t, naphthenic acid 3.0Kg/t, No. 2 oil 0.005Kg/t. After reverse flotation, flotage gangue and slurry rich in potassium feldspar are obtained.

2) Strong magnetic separation: The slurry rich in potassium feldspar obtained by reverse flotation undergoes a strong magnetic separation process to obtain magnetic minerals and non-magnetic minerals rich in potassium feldspar, with a magnetic field strength of 1.2T.

3) Weak magnetic separation: Combine the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation for weak magnetic separation; The magnetic field strength for selection is 0.20T, and the magnetic field strength for concentrating and sweeping is 0.17T; first, roughing is carried out to obtain roughing concentrate and roughing tailings; ore and concentrated tailings, the concentrated ore is iron ore concentrate, and the roughing tailings are swept once to obtain the scavenging concentrate and scavenging tailings, and the selected tailings and scavenging concentrate are returned and combined After roughing, iron concentrate and scavenging tailings with a grade of 65.5% and a recovery rate of 95.7% are finally obtained.

4) Positive flotation: The non-magnetic minerals rich in potassium feldspar obtained by strong magnetic separation are sent to the flotation device for positive flotation after pulping. Direct flotation adopts a process of roughing, one-time beneficiation and one-time sweeping. Firstly, roughing is carried out to obtain roughing concentrate and roughing tailings. Selected tailings, sweep the rougher tailings once to obtain the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank for roughing, the whole positive flotation During the process, the pH value of the pulp is 2.0, the mass concentration of the pulp is 40%, and the temperature of the pulp is 22°C; the regulator of reverse flotation is hydrofluoric acid, the collector is dodecylamine, and the foaming agent is No. 2 Oil; the addition amount of roughing agent is calculated by weight ratio: dodecylamine 4.0Kg/t, No. Kg/t, the amount of scavengers added is calculated by weight ratio: dodecylamine 2.4Kg/t, No. 2 oil 0.013Kg/t. Potassium feldspar concentrate with a purity of 98.8% and a recovery rate of 86.2% was obtained after positive flotation, and the tailings in the flotation tank were discarded.

Example 2

Using the Baiyun Obo potassium-rich slate with a particle size of -200 mesh accounting for more than 90%, a potassium feldspar content of 66.70%, and a magnetite grade of 6.2% as raw material, the following process steps are carried out by using the process method of the present invention:

1) Reverse flotation: Reverse flotation adopts a process of roughing, one-time beneficiation and one-time sweeping; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings, and the roughing concentrate is subjected to one-time beneficiation. Get the concentrated ore and tailings, carry out a scavenging on the rougher tailings, get the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank and combine them for roughing The inhibitor of reverse flotation is water glass, the collector is oleic acid, and the foaming agent is No. 2 oil; in the whole reverse flotation process, the pH value of the pulp is 9.6, and the mass concentration of the pulp is 49%. The temperature is 35°C. The addition amount of rough selection agent is calculated by weight ratio: water glass 2.0Kg/t, oleic acid 4.0Kg/t, No. Acid 3.0Kg/t, No. 2 oil 0.005Kg/t, the amount of scavenging agent added by weight ratio: water glass 1.2Kg/t, oleic acid 1.5Kg/t, No. 2 oil 0.006Kg/t. After reverse flotation, flotage gangue and slurry rich in potassium feldspar are obtained.

2) Strong magnetic separation: The slurry rich in potassium feldspar obtained by reverse flotation undergoes a strong magnetic separation process to obtain magnetic minerals and non-magnetic minerals rich in potassium feldspar, with a magnetic field strength of 1.2T.

3) Weak magnetic separation: Combine the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation for weak magnetic separation; The magnetic field strength for selection is 0.24T, and the magnetic field strength for concentrating and sweeping is 0.17T; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings; ore and concentrated tailings, the concentrated ore is iron ore concentrate, and the roughing tailings are swept once to obtain the scavenging concentrate and scavenging tailings, and the selected tailings and scavenging concentrate are returned and combined After roughing, iron concentrate and tailings with a grade of 66.0% and a recovery rate of 97.0% are finally obtained.

4) Positive flotation: The non-magnetic minerals rich in potassium feldspar obtained by strong magnetic separation are sent to the flotation device for positive flotation after pulping. Direct flotation adopts a process of roughing, one-time beneficiation and one-time sweeping. Firstly, roughing is carried out to obtain roughing concentrate and roughing tailings. Selected tailings, sweep the rougher tailings once to obtain the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank for roughing, the whole positive flotation During the process, the pH value of the pulp is 2.3, the mass concentration of the pulp is 40%, and the temperature of the pulp is 20°C; the regulator of reverse flotation is sulfuric acid, the collector is octadecylamine, and the foaming agent is No. 2 oil; , the addition amount of rough selection agent is calculated by weight ratio: octadecylamine 3.7Kg/t, No. /t, the amount of scavenging agent added is calculated by weight ratio: octadecylamine 2.6Kg/t, No. 2 oil 0.015Kg/t. Potassium feldspar concentrate with a purity of 99.0% and a recovery rate of 85.6% is obtained after positive flotation, and the tailings in the flotation tank are discarded.

Example 3

Using the Baiyunebo potassium-rich slate with a particle size of -200 mesh accounting for more than 90%, a potassium feldspar content of 63.25%, and a magnetite grade of 4.9% as raw material, the following process steps are carried out by using the process method of the present invention:

1) Reverse flotation: Reverse flotation adopts a process of roughing, one-time beneficiation and one-time sweeping; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings, and the roughing concentrate is subjected to one-time beneficiation. Get the concentrated ore and tailings, carry out a scavenging on the rougher tailings, get the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank and combine them for roughing The inhibitor of reverse flotation is water glass, the collector is oxidized paraffin wax soap, and the foaming agent is No. 2 oil; in the whole reverse flotation process, the pH value of the pulp is 8.9, and the mass concentration of the pulp is 30%. The temperature of the pulp is 20°C. The addition amount of roughing agents is calculated by weight ratio: water glass 1.8Kg/t, oxidized paraffin soap 3.6Kg/t, No. 2 oil 0.010Kg/t, the addition amount of selection and sweeping agents are both: water glass 1.2Kg/t , oxidized paraffin soap 3.0Kg/t, No. 2 oil 0.005Kg/t. After reverse flotation, flotage gangue and slurry rich in potassium feldspar are obtained.

2) Strong magnetic separation: The slurry rich in potassium feldspar obtained by reverse flotation undergoes a strong magnetic separation process to obtain magnetic minerals and non-magnetic minerals rich in potassium feldspar, with a magnetic field strength of 1.1T.

3) Weak magnetic separation: Combine the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation for weak magnetic separation; The magnetic field strength for selection is 0.25T, and the magnetic field strength for concentrating and sweeping is 0.17T. ore and concentrated tailings, the concentrated ore is iron ore concentrate, and the roughing tailings are swept once to obtain the scavenging concentrate and scavenging tailings, and the scavenging concentrate and scavenging concentrate are combined and returned After roughing, the finally obtained minerals are only iron concentrate and scavenging tailings with a grade of 66.3% and a recovery rate of 96.2%.

4) Positive flotation: The non-magnetic minerals rich in potassium feldspar obtained by strong magnetic separation are sent to the flotation device for positive flotation after pulping. Direct flotation adopts a process of roughing, one-time beneficiation and one-time sweeping. Firstly, roughing is carried out to obtain roughing concentrate and roughing tailings. Selected tailings, sweep the rougher tailings once to obtain the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank for roughing, the whole positive flotation During the process, the pH value of the pulp is 2.0, the mass concentration of the pulp is 40%, and the temperature of the pulp is 27°C; the regulator of reverse flotation is hydrofluoric acid, the collector is mixed amine, and the foaming agent is No. 2 oil ; The addition amount of roughing agent is calculated by weight ratio: mixed amine 3.6Kg/t, No. 2 oil 0.01Kg/t; Kg/t. Potassium feldspar concentrate with a purity of 98.4% and a recovery rate of 86.5% is obtained after positive flotation, and the tailings in the flotation tank are discarded.

Example 4

With the Baiyan Obo potassium-rich slate raw material whose particle size is -200 mesh accounting for more than 90%, potassium feldspar content of 67.28%, and magnetite grade of 4.6%, the following process steps are carried out by using the process method of the present invention:

1) Reverse flotation: Reverse flotation adopts a process of roughing, one-time beneficiation and one-time sweeping; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings, and the roughing concentrate is subjected to one-time beneficiation. Get the concentrated ore and tailings, carry out a scavenging on the rougher tailings, get the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank and combine them for roughing The depressant of reverse flotation is water glass, the collector is tall oil, and the foaming agent is No. 2 oil; in the whole reverse flotation process, the pH value of the pulp is 9.2, and the mass concentration of the pulp is 38%. The temperature of the pulp is 26°C. The addition of roughing agents is calculated by weight ratio: water glass 1.8Kg/t, tall oil 3.6Kg/t, No. 2 oil 0.010Kg/t; Er oil 2.5Kg/t, No. 2 oil 0.005Kg/t, addition amount of scavenging agent: water glass 0.5Kg/t, tall oil 1.5Kg/t, No. 2 oil 0.015Kg/t. After reverse flotation, flotage gangue and slurry rich in potassium feldspar are obtained.

2) Strong magnetic separation: The slurry rich in potassium feldspar obtained by reverse flotation undergoes a strong magnetic separation process to obtain magnetic minerals and non-magnetic minerals rich in potassium feldspar, with a magnetic field strength of 1.2T.

3) Weak magnetic separation: Combine the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation for weak magnetic separation; The magnetic field strength for selection is 0.25T, and the magnetic field strength for concentrating and sweeping is 0.20T; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings; ore and concentrated tailings, the concentrated ore is iron ore concentrate, and the roughing tailings are swept once to obtain the scavenging concentrate and scavenging tailings, and the scavenging concentrate and scavenging concentrate are combined and returned After roughing, iron concentrate and scavenging tailings with a grade of 65.8% and a recovery rate of 96.3% are finally obtained.

4) Positive flotation: The non-magnetic minerals rich in potassium feldspar obtained by strong magnetic separation are sent to the flotation device for positive flotation after pulping. Direct flotation adopts a process of roughing, one-time beneficiation and one-time sweeping. Firstly, roughing is carried out to obtain roughing concentrate and roughing tailings. Selected tailings, sweep the rougher tailings once to obtain the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank for roughing, the whole positive flotation During the process, the pH value of the pulp is 2.4, the mass concentration of the pulp is 38%, and the temperature of the pulp is 27°C; the regulator of reverse flotation is hydrofluoric acid, the collector is trialkylamine, and the foaming agent is di No. 1 oil; the amount of roughing agents added by weight ratio: trialkylamine 4.0Kg/t, No. 2 oil 0.01Kg/t, the amount of selected agents added by weight ratio: No. 0.005Kg/t oil, the amount of scavengers added by weight ratio: trialkylamine 1.1Kg/t, No. 2 oil 0.013Kg/t. Potassium feldspar concentrate with a purity of 98.9% and a recovery rate of 88.4% is obtained after positive flotation, and the tailings in the flotation tank are discarded.

Example 5

Using the Baiyun Obo potassium-rich slate powder with a particle size of -200 mesh accounting for more than 90%, a potassium feldspar content of 64.73%, and a magnetite grade of 6.4% as raw material, the following process steps are carried out by using the process method of the present invention:

1) Reverse flotation: Reverse flotation adopts a process of roughing, one-time beneficiation and one-time sweeping; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings, and the roughing concentrate is subjected to one-time beneficiation. Get the concentrated ore and tailings, carry out a scavenging on the rougher tailings, get the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank and combine them for roughing The depressant of reverse flotation is water glass, the collector is naphthenic acid, and the foaming agent is No. 2 oil; in the whole reverse flotation process, the pH value of the pulp is 9.3, and the mass concentration of the pulp is 39%. The temperature of the pulp is 28°C. , the addition amount of roughing agents is calculated by weight ratio: water glass 1.9Kg/t, naphthenic acid 3.9Kg/t, No. Kg/t, naphthenic acid 3.0Kg/t, No. 2 oil 0.005Kg/t. After reverse flotation, flotage gangue and slurry rich in potassium feldspar are obtained.

2) Strong magnetic separation: The slurry rich in potassium feldspar obtained by reverse flotation undergoes a strong magnetic separation process to obtain magnetic minerals and non-magnetic minerals rich in potassium feldspar. The magnetic field strength is 1.2T.

3) Weak magnetic separation: Combine the floating minerals obtained by reverse flotation and the magnetic minerals obtained by strong magnetic separation for weak magnetic separation; The magnetic field strength for selection is 0.25T, and the magnetic field strength for concentrating and sweeping is 0.18T; firstly, roughing is carried out to obtain roughing concentrate and roughing tailings, and the roughing concentrate is once selected to obtain concentrated concentrate ore and concentrated tailings, the concentrated ore is iron ore concentrate, and the roughing tailings are swept once to obtain the scavenging concentrate and scavenging tailings, and the scavenging concentrate and scavenging concentrate are combined and returned After roughing, the grade 65.5% iron concentrate and tailings are finally obtained.

4) Positive flotation: The non-magnetic minerals rich in potassium feldspar obtained by strong magnetic separation are sent to the flotation device for positive flotation after pulping. Direct flotation adopts a process of roughing, one-time beneficiation and one-time sweeping. Firstly, roughing is carried out to obtain roughing concentrate and roughing tailings. Selected tailings, sweep the rougher tailings once to obtain the scavenging concentrate and scavenging tailings, return the selected tailings and scavenging concentrate to the rougher tank for roughing, the whole positive flotation During the process, the pH value of the pulp is 2.5, the mass concentration of the pulp is 40%, and the temperature of the pulp is 35°C; the regulator of reverse flotation is sulfuric acid, the collector is octadecylamine, and the foaming agent is No. 2 oil; The amount of roughing agent added is calculated by weight ratio: octadecylamine 4.0Kg/t, No. 2 oil 0.015Kg/t; t, the addition amount of scavenging agent is calculated by weight ratio: octadecylamine 1.2Kg/t, No. 2 oil 0.005Kg/t. Potassium feldspar concentrate with a purity of 98.0% and a recovery rate of 87.8% is obtained after positive flotation, and the tailings in the flotation tank are discarded.

Claims (4)

1. the beneficiation method of Bayan Obo k-rich slate sorting potassic feldspar concentrate and iron ore concentrate is characterized in that, method step is as follows:

(1) reverse flotation: account for k-rich slate more than 90% take granularity as-200 orders as raw material, carry out reverse flotation, reverse flotation adopts one roughing, primary cleaning and once purging selection, cleaner tailings and scavenger concentrate are turned back to initial separatory cell to be proceeded to roughly select, regime of agent: inhibitor is waterglass, collecting agent is fatty acid collecting agent, foaming agent is No. two oil, in the reverse flotation process, the mass concentration of ore pulp is 30%～50%, pH values of pulp is 8～10, the temperature of ore pulp is 18～35 ℃, roughly select the medicament addition by weight: inhibitor 0.5～2.0Kg/t, collecting agent 1.5～4.5Kg/t, foaming agent 0.005～0.02Kg/t, selected and scan the medicament addition by weight: inhibitor 0.5～1.5Kg/t, collecting agent 1.0～3.0Kg/t, foaming agent 0～0.015Kg/t, the foam that reverse flotation obtains is easily floating mine tailing, and ore pulp is the concentrate that is rich in potassic feldspar;

(2) high intensity magnetic separation: the reverse flotation concentrate that is rich in potassic feldspar is out carried out high intensity magnetic separation, obtain magnetic mineral and the two kinds of products of non magnetic ore that are rich in potassic feldspar, magnetic field intensity is 1.0～1.2T;

(3) low intensity magnetic separation: reverse flotation easily floating mineral and the magnetic mineral elected of high intensity magnetic separation out carried out low intensity magnetic separation, the flow process of one roughing, primary cleaning and once purging selection is adopted in low intensity magnetic separation, cleaner tailings and scavenger concentrate are returned rear merging to be roughly selected, the magnetic field intensity of roughly selecting is 0.2～0.26T, selected and magnetic field intensity that scan is 0.17～0.2T, finally obtains iron ore concentrate and scans mine tailing;

(4) direct flotation: the non magnetic ore that is rich in potassic feldspar that high intensity magnetic separation is obtained carries out direct flotation, adopt one roughing, primary cleaning and once purging selection, cleaner tailings and scavenger concentrate are turned back to initial separatory cell to be proceeded to roughly select, the medicament that direct flotation adopts: adjusting agent is that sulfuric acid or hydrofluoric acid, collecting agent are that amine collector, No. two oil are foaming agent, adopts the system of stage agent addition; In the direct flotation process, the mass concentration of ore pulp is 30%～50%, the pH value of ore pulp is 2～3, the temperature of ore pulp is 18～35 ℃, roughly select the medicament addition by weight: collecting agent 1.5～4.5Kg/t, foaming agent 0.005～0.02Kg/t, selected and scan the medicament addition by weight: collecting agent 1.0～3.0Kg/t, foaming agent 0.005～0.015Kg/t, the froth pulp that obtains behind the direct flotation are final potassic feldspar concentrate, and the ore pulp in the flotation cell is mine tailing.

2. the beneficiation method of Bayan Obo k-rich slate sorting potassic feldspar concentrate according to claim 1 and iron ore concentrate is characterized in that: potassic feldspar purity is 50～70% in the described k-rich slate, the magnetic iron ore grade is 3.5～8%.

3. the beneficiation method of Bayan Obo k-rich slate sorting potassic feldspar concentrate according to claim 1 and iron ore concentrate is characterized in that: described fatty acid collecting agent is a kind of in oleic acid, tall oil, aphthenic acids, the oxidized paraffin wax.

4. the beneficiation method of Bayan Obo k-rich slate sorting potassic feldspar concentrate according to claim 1 and iron ore concentrate is characterized in that: described amine collector is a kind of in lauryl amine, octadecylamine, mixed amine, the trialkylamine.

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