Comprehensive recycling method of cyanide tailing slag

A technology for cyanidation of tailings and tailings, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve problems such as large fluctuations in raw material grades, environmental hidden dangers, and poor operation stability of acid production systems, and achieve efficient separation and recovery. , reducing pollution and improving comprehensive utilization efficiency

Active Publication Date: 2014-08-13
ZHAOJIN MINING +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

The dumping of cyanide tailings will inevitably have a serious impact on the environment, such as occupying a large amount of land, wasting mineral resources, and leaving highly toxic CN - Pollution to the soil of the river, affecting the ecological environment, and the dam break of the tailings pond may even cause potential safety hazards
[0007] The existing treatment methods for cyanidation tailings are simply stockpiling or landfilling, and a large amount of valuable elements are wasted
Although the cyanide tailings after multi-element recovery treatment still contain a large amount of low-grade sulfur and iron elements (generally contain 20-30% sulfur and 20-30% iron), but because of the multi-process treatment, the muddy phenomenon is intensified , the particle size becomes finer (-400 mesh content is greater than 90%), the water content is as high as 20%, the viscosity increases, the pressure filtration is difficult, and it contains highly toxic CN - As well as residual polluting agents, there are serious environmental hazards directly discharged as solid waste
Spontaneous aggregation effect of fine-grained minerals and a large number of CN - The existence of the inhibitory effect on the buoyancy of sulfur and iron elements brings great difficulties to the enrichment and separation of sulfur and iron elements
Some domestic gold companies simply use this cyanide tailings to boil and roast to produce acid. Due to the high water content and high viscosity of the raw materials, they have to use the original "drying ore" method to meet the raw material requirements for the furnace. In addition, the raw material grade fluctuates greatly. On the one hand, it leads to poor operation stability of the acid production system, low utilization rate of waste heat and low production efficiency. On the other hand, the iron content of acid production slag is 30-40%, which cannot be directly used as ironmaking raw materials, but can only be used as cement raw materials. The amount of digestion is very limited, and the added value of the product is low. These red iron slags can only be dumped and stored, and the economic benefits are poor
In addition, precious gold, silver, copper and other resources in the waste residue are also completely wasted

Method used

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  • Comprehensive recycling method of cyanide tailing slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for comprehensive recovery and utilization of cyanide tailings, comprising the following steps:

[0054] (1) Flotation to obtain high-sulfur concentrate: add water to the cyanide tailings to make it into pulp, adjust the total mass of solute in the pulp to account for 31% of the total mass of the pulp, add acid to adjust the pH of the pulp to 5, and use 450L / h Collectors are added at a high speed, and the sulfur concentrate and tailings are obtained after a roughing, a second beneficiation, and two sweepings. After the sulfur concentrate and tailings are concentrated and filtered, the tailings are used to make bricks or cement ;

[0055] (2) Acid production: After the sulfur concentrate obtained in step (1) is naturally dried to a water content of 8-10%, the sulfur concentrate is put into a roasting furnace at a rate of 15t / h, and the fluidizing air is introduced into the roasting furnace for weak Oxygen roasting, the roasting temperature is 850°C, the roastin...

Embodiment 2

[0060] A method for comprehensive recovery and utilization of cyanide tailings, comprising the following steps:

[0061] (1) Flotation to obtain high-sulfur concentrate: add water to the cyanide tailings to make it into a pulp, adjust the total mass of solute in the pulp to account for 33% of the total mass of the pulp, add acid to adjust the pH of the pulp to 5, and use 450L / h Collectors are added at a high speed, and the sulfur concentrate and tailings are obtained after a roughing, a second beneficiation, and two sweepings. After the sulfur concentrate and tailings are concentrated and filtered, the tailings are used to make bricks or cement ;

[0062] (2) Acid production: After the sulfur concentrate obtained in step (1) is naturally dried to 8-10% water content, the sulfur concentrate is put into the roasting furnace at a rate of 20t / h, and the fluidizing air is fed into the roasting furnace for weak Oxygen roasting, the roasting temperature is 900°C, the roasting linear...

Embodiment 3

[0067] A method for comprehensive recovery and utilization of cyanide tailings, comprising the following steps:

[0068] (1) Flotation to obtain high-sulfur concentrate: add water to the cyanide tailings to make it into a pulp, adjust the total mass of solute in the pulp to account for 35% of the total mass of the pulp, add acid to adjust the pH of the pulp to 6, and use 450L / h Collectors are added at a high speed, and the sulfur concentrate and tailings are obtained after a roughing, a second beneficiation, and two sweepings. After the sulfur concentrate and tailings are concentrated and filtered, the tailings are used to make bricks or cement ;

[0069] (2) Acid production: After the sulfur concentrate obtained in step (1) is naturally dried to 8-10% of water content, the sulfur concentrate is put into the roasting furnace at a rate of 16t / h, and the fluidizing air is fed into the roasting furnace for weakening Oxygen roasting, the roasting temperature is 950°C, the roastin...

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Abstract

The invention belongs to the technical field of metallurgical waste slag recovery and in particular relates to a comprehensive recycling method of cyanide tailing slag. Cyanide tailings is floated to obtain sulfur concentrate and tailing, sulfur concentrate is roasted by weak oxygen to obtain sulfuric acid, and pyritic slag is subjected to chlorination roasting to enable valuable elements to be recycled. By virtue of the comprehensive recycling method disclosed by the invention, the valuable elements can be efficiently separated and recovered from cyanide tailing slag, and cyanide tailing slag is utilized to a maximum extent, the comprehensive utilization efficiency of resources is improved and the pollution of cyanide tailing slag to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of recycling metallurgical waste residues, in particular to a method for comprehensive recycling of cyanide tailings. Background technique [0002] Cyanide tailings are terminal polymetallic wastes containing acidic, alkaline, highly toxic cyanide ions and heavy metal components produced in the cyanidation gold extraction process in the gold smelting process. The composition is shown in the following table: [0003] [0004] [Note]: Units of Au and Ag are g / t. [0005] Among the many methods and processes of gold dressing and smelting, cyanide leaching and gold extraction is the main method of gold dressing and smelting in the world. Since its application in 1887, the cyanidation gold extraction process has been widely used due to its high recovery rate, strong adaptability to ore, simple process operation, low cost, and avoidance of gold ore transportation losses. As of 2001, 80% of the world's All new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C04B18/12C04B7/14C01B17/36
CPCY02P10/20Y02P40/10Y02W30/91
Inventor 时文革秦洪训王彩霞王立新赵军栾东武
Owner ZHAOJIN MINING
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