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Method for chloridizing roasting and ammonia extraction of silver and manganese products for manganese silver finished ore

A technology of chlorination roasting and manganese-silver concentrate, which is applied in the field of extracting silver and manganese products by chlorination roasting and ammonia leaching of manganese-silver concentrate, which can solve the large investment cost of the production process, environmental protection and safety adverse effects, and environmental protection requirements Higher problems, to achieve the effect of low product cost, significant comprehensive utilization effect, and flexible scale

Active Publication Date: 2006-07-19
广西锰华科技投资有限公司
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AI Technical Summary

Problems solved by technology

[0002] Since manganese-silver concentrate is manganese-based sulfide ore, the main problem in the treatment of this type of ore is that it is difficult to separate manganese and silver no matter in pyrometallurgy or hydrometallurgy; if it is treated before smelting, arsenic, sulfur Comprehensive recovery is difficult and the process is cumbersome; arsenic in the production process of acid recovery is easy to poison the catalyst, and has high requirements for environmental protection
Although this type of method improves the recovery rate to some extent, due to the long process and many links, the dispersion loss of silver is increased, which affects the further improvement of the total recovery rate of silver.
The above methods can only produce alloy or crude silver at one time. At the same time, due to the use of highly corrosive strong acids, highly toxic cyanide and lead, they have adverse effects on environmental protection and safety during the operation process, and the requirements for equipment anti-corrosion are strict. High investment costs in the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 10 tons of manganese-silver concentrate with a silver content of 2253 g / t is oxidized and roasted in a 14m×φ1.6m rotary kiln, the temperature of the kiln head is controlled at 850°C, the temperature of the kiln tail is less than 300°C, roasted for 2 hours, and desulfurized The rate is 96%. Add 1,044 kg of industrial calcium chloride to the calcined sand, and then chlorinate and roast for 2 hours at a kiln head temperature of 750°C and a kiln tail temperature of <300°C, with a chlorination rate of 94.5%. Add 40 tons of water to stir, settle, pump to remove impurities soluble in water, and the removal rate of impurities is nearly 100%. Then conventionally stirred with 20000 liters of ammonia solution of normality 1.7 for 0.5 hour, and the silver leaching rate was 80.3%. Add 5.6 liters of hydrazine hydrate with a hydrazine content of 40% to the immersion liquid, conventionally stir, titrate, and stand for 1 hour to yield 16.925 kg of sponge silver, and the silver reductio...

Embodiment 2

[0018] 10 tons of manganese-silver concentrates with a silver content of 4962 g / t were oxidized and roasted in the same kiln as in Example 1, the controlled kiln head temperature was 900°C, the kiln tail temperature was <300°C, roasted for 2 hours, and the desulfurization rate was 98.15%. . Add 800 kg of industrial salt to the calcined sand, and carry out chlorination and roasting for 2 hours at a kiln head temperature of 800°C and a kiln tail temperature of <300°C, with a chlorination rate of 96.5%. Add 50 tons of water to stir, settle, pump to remove impurities soluble in water, and the removal rate of impurities is nearly 100%. Then add 35,000 liters of ammonia solution with a normality of 2.0 and stir for 1 hour, and the silver leaching rate is 98.12%. Add 19.2 liters of hydrazine hydrate with a hydrazine content of 40% to the immersion solution, conventionally stir, titrate, and stand for 2 hours to yield 47.72 kg of sponge silver, and the silver reduction rate in the im...

Embodiment 3

[0020] 10 tons of manganese-silver concentrates with a silver content of 7654 g / t were oxidized and roasted in the same kiln as in Example 1. The controlled kiln head temperature was 850° C., and the kiln tail temperature was <300° C. After roasting for 2.5 hours, the desulfurization rate was 96.76%. Add 1,300 kg of industrial salt to the calcined sand, and carry out chlorination and roasting for 3 hours at a kiln head temperature of 850°C and a kiln tail temperature of <300°C, with a chlorination rate of 96.76%. Add 60 tons of water to stir, settling for 1 hour, pumping liquid to remove impurities dissolved in water, and the removal rate of impurities is nearly 100%. Then add 45,000 liters of ammonia solution with a normality of 2.2 and stir for 1.5 hours, and the silver leaching rate is 98.0%. Add 35.10 liters of hydrazine hydrate with a hydrazine content of 40% to the immersion liquid, stir conventionally, titrate, and let stand for 1.5 hours to yield 73.132 kg of sponge si...

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Abstract

A process for extracting silver and manganses products from manganses silver ore concentrate by adopting chloridising roasting and ammine leaching comprises the steps of oxidizing roasting the manganses silver ore concentrate, adding chlorizating agent therein for a chloridising roasting or adding chlorizating agent therein to directly execute a chloridising roasting, water washing the roasted product to remove water soluble metal impurities, mixing the water-washed roasted product with ammoniacal liquor and stirring them for silver leaching; deoxidizing the silver-ammonia solution with hydrazine hydrate, filter-filtrating or pump-filtrating and washing the generated sponges silver, adding covering agent and fluxing medium therein, and casting them into commercial product silver with a silver content of 99.99%. By adopting the process in accordance with the present invention to extract silver from manganses silver ore concentrate, the decentralization loss of silver during the operation course is reduced, and the high recovery rate of silver is ensured; the primary materials used has small corrosivity and low poisonous character, the operation is safe, the environment pollution is small, the construction investment is small, the scale sizes is flexible, the cost of products is low, the technology is reliable, the index is stable, and the comprehensive utilization effect is remarkable.

Description

technical field [0001] The invention belongs to a method for extracting silver and manganese products from manganese silver concentrate. Background technique [0002] Since manganese-silver concentrate is manganese-based sulfide ore, the main problem in the treatment of this type of ore is that it is difficult to separate manganese and silver no matter in pyrometallurgy or hydrometallurgy; if it is treated before smelting, arsenic, sulfur Comprehensive recovery is difficult, and the process is cumbersome; arsenic in the recovery process of acid production can easily poison the catalyst, and has high requirements for environmental protection. In view of the current technical situation, the metallurgical industry is seeking better smelting methods. [0003] The patents applied in China are "Wet Silver Extraction Process of High Manganese Pyrite Silver Ore", "Patent Application No. 97112371" and "Method for Producing Manganese Sulfate and Extracting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B11/06C22B47/00C22B3/14
Inventor 周国宪谭再钧
Owner 广西锰华科技投资有限公司
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