Purpose of by-product ammonium thiosulfate generated in steel-making waste water treatment process as complexing agent for leaching silver and its application method

A technology for treating process and steelmaking wastewater, which is applied in the field of silver leaching with ammonium thiosulfate as a complexing agent, can solve the problems of easy oxidation of thiourea, high price of thiourea, and large consumption, and achieve easy industrial continuous production , good selectivity, and little environmental damage

Inactive Publication Date: 2012-07-11
苏州久王环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thiourea is easily oxidized, so it consumes a lot during use. At the same time, the price of thiourea is relatively high. From economic considerations, this method is difficult to apply in industrial production.
Ammonia water is a low-cost complexing reagent. The ammonia water leaching method is mainly suitable for the situation with high silver content. For the silver-containing samples of zinc smelting waste residue, the leaching rate is low, so it is not applicable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for leaching silver using the by-product ammonium thiosulfate produced in the steelmaking wastewater treatment process as a complexing agent, comprising the following steps:

[0014] ①. Grinding the zinc smelting waste slag with a three-roller ball mill to particles with a diameter of about 0.10 mm, and drying in an oven to obtain powdered zinc slag;

[0015] ② Take 8.56g of ammonium thiosulfate residue (ammonium thiosulfate 69.0wt%, ammonium sulfate 31.0wt%) after extracting potassium thiocyanate from the steelmaking wastewater of Nangang (containing 0.04mol ammonium thiosulfate and 0.02mol ammonium sulfate ) into distilled water, constant volume, and make 200mL solution for later use; add 100g powdered zinc slag (containing 680ppm silver) into the above solution, heat, and stir at 60°C for 4 hours;

[0016] ③. The remaining waste residue was filtered out, dried, and the mass fraction of silver in the waste residue was determined by elemental analysis to be 89...

Embodiment 2

[0018] A method for leaching silver using the by-product ammonium thiosulfate produced in the steelmaking wastewater treatment process as a complexing agent, comprising the following steps:

[0019] ①. Grinding the zinc smelting waste slag with a three-roller ball mill to particles with a diameter of about 0.15 mm, and drying in an oven to obtain powdered zinc slag;

[0020] ② Take 21.4g of the ammonium thiosulfate residue (ammonium thiosulfate 69.0wt%, ammonium sulfate 31.0wt%) after extracting potassium thiocyanate from the steelmaking wastewater of Nangang (containing 0.1mol ammonium thiosulfate and 0.05mol ammonium sulfate ) into distilled water, constant volume, and make 200mL solution for use; 100g100g powdered zinc slag (containing 680ppm silver) was added to the above solution, heated, and stirred at 60°C for 5 hours;

[0021] ③. The remaining waste residue was filtered out, dried, and the mass fraction of silver in the waste residue was determined by elemental analysi...

Embodiment 3

[0023] A method for leaching silver using the by-product ammonium thiosulfate produced in the steelmaking wastewater treatment process as a complexing agent, comprising the following steps:

[0024] ①. Grinding the zinc smelting waste slag with a three-roller ball mill to particles with a diameter of about 0.20 mm, and drying in an oven to obtain powdered zinc slag;

[0025] ② Take 34.24g of the ammonium thiosulfate residue (ammonium thiosulfate 69.0wt%, ammonium sulfate 31.0wt%) after extracting potassium thiocyanate from the steelmaking wastewater of Nangang (containing 0.16mol ammonium thiosulfate and 0.08mol ammonium sulfate ) into distilled water, constant volume, and make 200mL solution for later use; add 100g powdered zinc slag (containing 680ppm silver) into the above solution, heat, and stir at 60°C for 4 hours;

[0026] ③. The remaining waste residue was filtered out, dried, and the mass fraction of silver in the waste residue was determined by elemental analysis to ...

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Abstract

The invention discloses a purpose of a by-product ammonium thiosulfate generated in a steel-making waste water treatment process as a complexing agent for leaching silver and its application method. According to the invention, the by-product ammonium thiosulfate generated in the steel-making waste water treatment process as the complexing agent are reacted with the silver-containing solution for leaching silver; the by-product ammonium thiosulfate generated in the steel-making waste water treatment process is taken as the complexing agent for leaching silver, because thiosulfate radical ion and silver ion can form a stable complex, ammonia ion and silver ion can form stable silver-ammonia complex ion, therefore a better leaching effect is provided to silver chloride, silver oxide, silver sulfide and metal silver, and the ammonium thiosulfate solution possesses high leaching rate to silver under low concentration, the invention has the advantages of short leaching time, high leaching rate, good selectivity, low base metal leaching rate, small environment damage and small hidden trouble in safety production.

Description

technical field [0001] The invention relates to a use of ammonium thiosulfate, a by-product produced in the treatment process of steelmaking wastewater, as a complexing agent for leaching silver and a method for using it; it belongs to the technical field of silver recovery. Background technique [0002] Lead-zinc deposits are often associated with gold and silver ore, mainly distributed in the primary lead-zinc ore. Because the gold and silver grades of the associated ore are low, it is difficult to meet the industrial requirements of independent gold and silver mines. recycle and re-use. At present, due to the comprehensive consideration of economic benefits and process technology, the recovery rate of these associated silver is low. For example, in the Nanjing lead-zinc-silver mine, the comprehensive recovery rate of silver is about 55.8%. Therefore, in general, silver recovery technology still needs to be developed. [0003] At present, the methods of recovering silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B7/04C22B11/00
CPCY02P10/20
Inventor 张超智王宏明郭照冰顾智杰
Owner 苏州久王环保科技股份有限公司
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