CN101224443A - A kind of comprehensive utilization method of iron sulfide mineral - Google Patents

Abstract

The invention relates to a method for recovering iron-sulfur gold from iron sulfide minerals, which is characterized in that the iron sulfide minerals are subjected to a rough selection, 1-2 times of concentration, and 1-3 times of scavenging and flotation for the iron sulfide minerals. iron sulfide concentrate, and then carry out a beneficiation and separation to obtain a high-sulfur concentrate with a sulfur weight ≥ 49% and a sulfur concentrate with a low-sulfur concentrated tailings, and then separate the high-sulfur concentrate and the high-sulfur concentrate Sulfur concentrate from beneficiation tailings with low sulfur content is recycled. In the method of the present invention, a separation operation is added after the conventional iron sulfide mineral flotation selection operation, and the high-sulfur content concentrate and the low-sulfur content concentrate are separated and then recycled separately. It effectively avoids the pollution of sulfuric acid slag to the environment, and fully recovers useful resources, achieving the goals of energy saving, emission reduction and efficient recovery.

Description

A kind of comprehensive utilization method of iron sulfide mineral

technical field

The invention relates to a method for recovering iron-sulfur gold from iron sulfide minerals.

Background technique

Iron sulfide minerals are usually obtained from individual iron sulfide ores or non-ferrous polymetallic ores containing iron sulfide minerals through conventional flotation, and the utilization of iron sulfide ores is mainly used for chemical acid production. At present, the acid production process of iron sulfide ore adopts roasting acid production process. Since the sulfur grade of iron sulfide minerals is mostly lower than 40%, the sulfuric acid slag prepared by roasting sulfuric acid is difficult to continue to use because of its low iron content, high sulfur content, and high silicon dioxide content. Most of them are stored as waste. On the one hand, it causes Environmental pollution is caused, on the one hand, the utilization rate of iron sulfide minerals is low, resulting in waste of resources.

Contents of the invention

The purpose of the present invention is to provide a method for comprehensive utilization of iron sulfide minerals that can effectively improve the utilization rate of iron sulfide minerals and reduce the pressure of environmental pollution.

The purpose of the present invention is achieved through the following technical solutions.

A method for comprehensive utilization of iron sulfide minerals, characterized in that the process is to process the iron sulfide minerals from the iron sulfide concentrate obtained by roughing the iron sulfide minerals once, 1-2 times of beneficiation, and 1-3 times of scavenging and flotation, and then Carry out a beneficiation and separation to obtain high-sulfur concentrate and low-sulfur concentrated tailings with a sulfur weight ≥ 49%, and then separate the high-sulfur concentrate and low-sulfur concentrated tailings The sulfur concentrate of the mine is recycled.

A method for comprehensive utilization of iron sulfide minerals of the present invention is characterized in that the method for recovering and treating the sulfur concentrate of the selected tailings with low sulfur content is to use a conventional roasting acid production process to produce sulfuric acid , Acid slag is used as an auxiliary material in cement production.

A method for comprehensive utilization of iron sulfide minerals of the present invention is characterized in that the method for recovering high-sulfur content concentrates is to use conventional acid-making fluidized furnaces to produce sulfuric acid, and the acid slag is used as iron concentrates Recycle.

A method for comprehensive utilization of iron sulfide minerals of the present invention is characterized in that the method for recovering high-sulfur content concentrates is to use a conventional acid-making fluidized furnace to produce sulfuric acid, and the acid slag is cyanided Gold is extracted, and cyanide slag is recovered as iron ore concentrate.

A method for comprehensive utilization of iron sulfide minerals of the present invention is characterized in that in the process of producing sulfuric acid in the high-sulfur content concentrate using a conventional acid-making fluidized furnace, the high-sulfur content concentrate is mixed with The 20% ~ 35% acid slag is then roasted to make acid.

In the method of the invention, a separation operation is added after the conventional iron sulfide mineral flotation selection operation, and two products of high-sulfur content concentrate (sulfur-containing weight ≥ 49%) and low-sulfur content concentrate are produced through separation. The purpose of producing concentrate with high sulfur content is to reduce the gangue minerals such as silicate in concentrate products, so as to prevent the agglomeration of ore powder in the subsequent high-temperature roasting acid production process and help the iron content of roasting slag reach the level of iron concentrate standard. Measures such as high temperature (800-950 degrees Celsius) and 20%-35% returned slag are adopted for concentrates with high sulfur content, the purpose is to desulfurize as much as possible (to make the sulfur content of acid slag less than 1%) and prevent mineral powder from caking. Block and improve the gold recovery rate of subsequent cyanide leaching (if the gold content in the acid residue is ≥ 1g/t). It effectively avoids the pollution of sulfuric acid slag to the environment, and fully recovers useful resources, achieving the goals of energy saving, emission reduction and efficient recovery.

Detailed ways

A method for comprehensive utilization of iron sulfide minerals, the process of which is to process the iron sulfide concentrates obtained from the iron sulfide minerals through a rough selection, 1-2 times of beneficiation, and 1-3 times of scavenging and flotation, and then perform a refining process. Separation and separation to obtain high-sulfur concentrates with a sulfur content of ≥49% and sulfur concentrates from concentrated tailings with low sulfur content. Mine is recycled.

The method for recovering and treating the sulfur concentrate of the selected tailings with low sulfur content is to adopt the conventional roasting acid production process to produce sulfuric acid, and the acid slag is used as an auxiliary material for cement production.

The method for recovering and treating high-sulfur concentrates is to use a conventional acid-making fluidized furnace to produce sulfuric acid, and recover the acid slag as iron concentrates.

The method for recovering ore with high sulfur content is to use a conventional acid-making fluidized furnace to produce sulfuric acid, use cyanide to extract gold from acid slag, and recover the cyanide slag as iron concentrate.

The process of producing sulfuric acid in the concentrated ore with high sulfur content using a conventional acid-making fluidized furnace, and adding acid slag accounting for 20% to 35% of the total weight of the concentrated ore in the high-sulfur content is roasted to produce acid.

Example 1

In a lead-zinc beneficiation plant, the tailings after zinc beneficiation contain 25.51% sulfur, and high-sulfur is obtained through conventional flotation and separation (adding 200g/t _{-dry ore} water glass and spraying water on the slurry surface) Concentrate with high sulfur content and concentrate with low sulfur content, the sulfur grade of high sulfur content concentrate is 49.56%, and the sulfur recovery rate is 45.38%; the sulfur grade of low sulfur content concentrate is 38.79%, and the sulfur recovery rate is 46.15%. Low-sulfur content concentrates are roasted in a conventional acid-making fluidized furnace at 650 degrees Celsius, and the acid slag contains 43.68% iron, which can be used as auxiliary materials for cement production; high-sulfur content concentrates are mixed with returned 25% slag at 900 degrees Celsius Under the conditions, the acid slag after roasting in a conventional acid-making fluidized furnace contains 64.26% iron, 0.73% sulfur, and 1.13g/t gold. It is washed with water until the pH value is neutral, and then lime is added to adjust the pH value to 10.5. 1Kg/t _{- dry ore} sodium cyanide, under the condition of liquid-solid ratio of 2, cyanide leaching for 24 hours, the leaching rate of gold is 68.37%, and the cyanide slag is the qualified iron concentrate.

Example 2

In a silver polymetallic ore dressing plant, the tailings after zinc selection contain 26.73% sulfur, which is obtained by conventional flotation and separation (adding 350g/t-dry ore water glass and spraying water on the slurry surface) High-sulfur concentrate and low-sulfur concentrate, the high-sulfur concentrate has a sulfur grade of 49.78% and a sulfur recovery rate of 46.23%; the low-sulfur concentrate has a sulfur grade of 39.54% and a sulfur recovery rate of 45.73%. The low-sulfur content concentrate is roasted in a conventional acid-making fluidized furnace at 550 degrees Celsius, and the acid slag contains 44.06% iron, which can be used as an auxiliary material for cement production; the high-sulfur content concentrate is mixed with returned 30% slag material at 850 degrees Celsius Under certain conditions, the acid slag contains 64.82% iron, 0.69% sulfur, and 0.35g/t gold after being roasted in a conventional acid-making fluidized furnace. This acid slag is a qualified iron concentrate.

Example 3

In a copper-sulfur ore concentrator, the tailings after _copper beneficiation contain 22.67% sulfur, and high Sulfur content concentrates and low sulfur content concentrates, of which the sulfur grade of high sulfur content concentrates is 49.09% and the sulfur recovery rate is 45.32%; the sulfur content of low sulfur content concentrates is 38.27% and the sulfur recovery rate is 47.07%. The low-sulfur content concentrate is roasted in a conventional acid-making fluidized furnace at 650 degrees Celsius, and the acid slag contains 42.98% iron, which can be used as an auxiliary material for cement production; the high-sulfur content concentrate is mixed with returned 28% slag at 800 degrees Celsius Under certain conditions, the acid slag contains 63.18% iron, 0.65% sulfur, and 2.27g/t gold after roasting in a conventional acid-making fluidized furnace. It is washed with water until the pH is neutral, and then lime is added to adjust the pH to 11. Add 1.5Kg/t _{-dried ore} sodium cyanide, under the condition of liquid-solid ratio of 2.5, cyanide leaching for 24 hours, the leaching rate of gold is 70.28%, and the cyanide slag is qualified iron ore concentrate.

Example 4

A single sulfur ore beneficiation plant, the raw ore contains 26.43% sulfur, through conventional flotation and separation (adding 350g/t _{-dry ore} water glass and adding spray water to the slurry surface) to obtain high-sulfur concentrate and The low-sulfur concentrate contains 50.17% sulfur grade and 46.53% sulfur recovery rate in the high-sulfur concentrate concentrate; the sulfur grade in the low-sulfur concentrate concentrate is 40.89% and the sulfur recovery rate is 46.58%. The low-sulfur content concentrate is roasted in a conventional acid-making fluidized furnace at 700 degrees Celsius, and the acid slag contains 44.73% iron, which can be used as an auxiliary material for cement production; the high-sulfur content concentrate is mixed with returned 35% slag at 860 degrees Celsius Under certain conditions, the acid slag contains 65.31% iron, 0.87% sulfur and no gold after being roasted in a conventional acid-making fluidized furnace. This acid slag is a qualified iron concentrate.

Example 5

In a copper-molybdenum ore dressing plant, the tailings after copper-molybdenum mixed separation contain 28.1% sulfur, which are separated by conventional flotation and separation (adding 400g/t _{-dry ore} water glass and spraying water on the liquid surface of the slurry) High-sulfur concentrate and low-sulfur concentrate were obtained. The high-sulfur concentrate had a sulfur grade of 49.89% and a sulfur recovery rate of 47.56%; the low-sulfur concentrate had a sulfur grade of 39.68% and a sulfur recovery rate of 45.47%. The low-sulfur content concentrate is roasted in a conventional acid-making fluidized furnace at 620 degrees Celsius, and the acid slag contains 43.59% iron, which can be used as an auxiliary material for cement production; the high-sulfur content concentrate is mixed with returned 20% slag at 820 degrees Celsius Under certain conditions, the acid slag contains 64.72% iron, 0.68% sulfur, and 1.84g/t gold after roasting in a conventional acid-making fluidized furnace. It is washed with water until the pH is neutral, and then lime is added to adjust the pH to 10. Add 0.8Kg/t _{-dried ore} sodium cyanide, under the condition of liquid-solid ratio of 3, cyanide leaching for 24 hours, the gold leaching rate is 69.79%, and the cyanide slag is qualified iron ore concentrate.

Claims (5)

1. the method for comprehensive utilization of an iron sulfide mineral, it is characterized in that its process be iron sulfide mineral is selected through one roughing, 1～2 time, scan the iron sulfide concentrate that floatingly selects for 1～3 time, carrying out primary cleaning again separates, the sulphur concentrate that separates the cleaner tailings of the high sulfur content concentrate obtain sulfur-bearing weight 〉=49% and low sulfur content recycles the sulphur concentrate of the cleaner tailings of high sulfur content concentrate and low sulfur content respectively again.

2. the method for comprehensive utilization of a kind of iron sulfide mineral according to claim 1, it is characterized in that the method that the sulphur concentrate of described cleaner tailings to low sulfur content recycles, be to adopt conventional roasting acid-making process to produce sulfuric acid, acid sludge is as the auxiliary material of manufacture of cement.

3. the method for comprehensive utilization of a kind of iron sulfide mineral according to claim 1 is characterized in that described method to the high sulfur content concentrate is recycled, and is to utilize conventional relieving haperacidity fluidized bed furnace to produce sulfuric acid, and acid sludge reclaims as iron ore concentrate.

4. the method for comprehensive utilization of a kind of iron sulfide mineral according to claim 1, it is characterized in that described method to the high sulfur content concentrate is recycled, be to utilize conventional relieving haperacidity fluidized bed furnace to produce sulfuric acid, the acid sludge extraction of gold by cyanidation, the cyaniding slag reclaims as iron ore concentrate.

5. the method for comprehensive utilization of a kind of iron sulfide mineral according to claim 1, it is characterized in that describedly adopting conventional relieving haperacidity fluidized bed furnace to produce sulfuric acid process, in the high sulfur content concentrate, allocate into and account for the roasting relieving haperacidity carried out behind 20%～35% heavy acid sludge of total batching at the high sulfur content concentrate.