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A technology for coal gangue and pyrite, which is applied in the field of comprehensive utilization of coal gangue, can solve the problems of occupying a large amount of land, environmental pollution, waste of resources, etc., so as to reduce the cost of grinding, reduce environmental pollution, and reduce slagging and adhesion. degree of effect
Inactive Publication Date: 2014-03-26
GUANGZHOU RES INST OF NON FERROUS METALS
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[0002] Coal gangue is solid waste in the process of coal mining. At present, the total amount of coal gangue discharged due to coal mining in my country has reached more than 4.5 billion tons, covering an area o
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Embodiment 1
[0024] The sulfur grade of the ore sample is 9.86% coal gangue, and the specific steps are as follows:
[0025] 1) Crushing: Two-stage crushing by the jaw crusher, and then use a 2mm sieve to check the screening and close-circuit fine crushing of the roller machine to -2mm, and the ore samples crushed to -2mm are mixed by moving piles;
[0026] 2) Grinding: Using imitation closed-circuit grinding, the crushed raw ore is ground to -0.074mm at a grinding concentration of 60%, accounting for 58.83%, and sieved with a 0.043mm sieve to screen out -0.043mm particle size Finally, the +0.043mm particle size returns to the ball mill for regrinding. After three times of grinding, screening, and coarse particle return, the grinding fineness is -0.074mm accounting for 98.58%, and -0.043mm accounting for 95.16%;
[0027] 3) Flotation: rough selection, secondary sweeping, and secondary selection are adopted, and the specific operations are as follows:
[0028] Rough separation: add 50% sul...
Embodiment 2
[0035] The sulfur grade of the ore sample is 5.65% coal gangue, and the specific steps are as follows:
[0036] 1) Crushing: Two-stage crushing by the jaw crusher, and then use a 2mm sieve to check the screening and close-circuit fine crushing of the roller machine to -2mm, and the ore samples crushed to -2mm are mixed by moving piles;
[0037] 2) Grinding: Using imitation closed-circuit grinding, the crushed raw ore is ground to -0.074mm at a grinding concentration of 60%, accounting for 60.65%, and sieved with a 0.043mm sieve to screen out -0.043mm particle size Finally, the +0.043mm particle size returns to the ball mill for regrinding. After three times of grinding, screening, and coarse particle return, the grinding fineness is -0.074mm accounting for 99.15%, and -0.043mm accounting for 95.27%;
[0038] 3) Flotation: rough selection, secondary sweeping, and secondary selection are adopted, and the specific operations are as follows:
[0039] Rough separation: add 50% sul...
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Abstract
The invention discloses a method for recovering pyrite from coal gangue. The method is characterized by comprising the following steps that the coal gangue is subjected to two-stage closed-circuit crushing, grinding, roughing, primary scavenging, secondary scavenging, primary cleaning and secondary cleaning. In the roughing step, acidified water glass, xanthate and number two oil are sequentially added to fed ore pulp, so that rougher concentrates and rougher tailings are obtained. In the primary scavenging step, acidified water glass, xanthate and number two oil are sequentially added to the rougher tailings, so that primarily scavenged concentrates and primarily scavenged tailings are obtained. In the secondary scavenging step, acidified water glass, xanthate and number two oil are sequentially added to the primarily scavenged tailings, so that secondarily scavenged concentrates and kaolin tailings are obtained. In the primary cleaning step, acidified water glass is added to the rougher concentrates, so that primary cleaner concentrates and primary cleaner tailings are obtained. In the secondary cleaning step, acidified water glass is added to the primary cleaner concentrates, so that the pyrite and secondary cleaner tailings are obtained. The method for recovering the pyrite from the coal gangue is simple; the pyrite recovery rate is high; environmental pollution is reduced; the pyrite can be produced on a large scale.
Description
technical field [0001] The invention relates to a method for comprehensive utilization of coal gangue, in particular to a method for recovering pyrite from coal gangue by using ore dressing technology. Background technique [0002] Coal gangue is solid waste in the process of coal mining. At present, the total amount of coal gangue discharged due to coal mining in my country has reached more than 4.5 billion tons, covering an area of more than 12,000 hectares. It is currently the largest industrial solid waste in my country. Not only It causes a huge waste of resources, takes up a lot of land, and easily causes environmental pollution. [0003] The main minerals in coal gangue are clay and pyrite, and the content of pyrite is generally above 3%. In recent years, my country's demand for sulfur and pyrite, raw materials for acid production, has risen rapidly. How to recycle pyrite in coal gangue and turn waste into treasure can not only alleviate the current tight supply of ...
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