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Method for recovering sodium nitrate from silver waste water

A technology for sodium nitrate and waste water, applied in the field of recycling sodium nitrate, can solve problems such as loss of sodium nitrate, and achieve the effects of simple operation method, increased economic benefits, and full utilization of resources

Active Publication Date: 2010-12-15
烟台招金励福贵金属股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Then add acid to neutralize, and the cyanide is neutrally discharged after passing the standard, resulting in the loss of a large amount of sodium nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for reclaiming sodium nitrate from silver waste water, the concrete operation steps are as follows:

[0021] 1. Alkaline oxidation of silver wastewater to break cyanide: For each cyanide-breaking treatment operation, first open the pipeline valve of the cyanide-breaking pool, turn on the circulating pump to make the pool in a circulating state; measure the pH value of 2 after circulating for 20 minutes, add liquid 100L of alkali continues to circulate and stir, and when the average pH value of the liquid in the pool is 10, add sodium hypochlorite (11% available chlorine) and circulate for 3 hours.

[0022] 2. Add hydrochloric acid to adjust the pH value: After the predicted cyanide is qualified, add an appropriate amount of hydrochloric acid to adjust the pH value, and circulate and stir until the pH value is 7. If the predicted result is unqualified, continue to repeat the above procedure until the cyanide is qualified. Sodium nitrate can be recovered.

[0023...

Embodiment 2

[0025] A method for reclaiming sodium nitrate from silver waste water, the concrete operation steps are as follows:

[0026] 1. Alkaline oxidation of silver wastewater to break cyanide: For each cyanide-breaking treatment operation, first open the pipeline valve of the cyanide-breaking tank, turn on the circulating pump to make the pool in a circulating state; measure the PII value of 4 after circulating for 50 minutes, and add liquid 200L of alkali continues to circulate and stir, and when the average pH value of the liquid in the pool is 12, add sodium hypochlorite (11% available chlorine) and circulate for 6 hours.

[0027] 2. Add hydrochloric acid to adjust the pH value: After the predicted cyanide is qualified, add an appropriate amount of hydrochloric acid to adjust the pH value, and circulate and stir until the pH value is 7. If the predicted result is unqualified, continue to repeat the above procedure until the cyanide is qualified. Sodium nitrate can be recovered.

...

Embodiment 3

[0030] A method for reclaiming sodium nitrate from silver waste water, the concrete operation steps are as follows:

[0031] 1. Alkaline oxidation of silver wastewater to break cyanide: For each cyanide-breaking treatment operation, first open the pipeline valve of the cyanide-breaking pool, turn on the circulation pump to make the pool in a circulating state; measure the pH value of 3 after 30 minutes of circulation, and add liquid 150L of alkali continues to circulate and stir, and when the average pH value of the liquid in the pool is 11, sodium hypochlorite (11% available chlorine) is added to circulate for 4 hours.

[0032] 2. Add hydrochloric acid to adjust the pH value: After the predicted cyanide is qualified, add an appropriate amount of hydrochloric acid to adjust the pH value, and circulate and stir until the pH value is 7. If the predicted result is unqualified, continue to repeat the above procedure until the cyanide is qualified. Sodium nitrate can be recovered. ...

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PUM

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Abstract

The invention relates to a method for recovering sodium nitrate from silver waste water, belonging to the technical field of environmental protection. The method for recovering the sodium nitrate from the silver waste water is characterized by comprising the following steps of: carrying out alkaline oxidation cyanide breaking on the silver waste water; adding acids for neutralization, and then filtering a solution for evaporation and concentration; and cooling and crystallizing to obtain the sodium nitrate. The method for recovering the sodium nitrate from the silver waste water has the advantages of simple operation method, economy and environmental protection and can sufficiently utilize the resources, thereby enhancing the economic benefits to a certain degree.

Description

technical field [0001] The invention relates to a method for recovering sodium nitrate from silver waste water, which belongs to the technical field of environmental protection. Background technique [0002] The reaction of silver nitrate and sodium cyanide can produce silver cyanide, and a large amount of waste water is produced in the production process, which mainly contains cyanide and a small amount of silver, and also contains a large amount of sodium nitrate. At present, the commonly used method for treating silver wastewater at home and abroad is alkaline oxidation to break cyanide, and its main chemical reaction formula is: [0003] CN - +HClO→CNCl+OH - [0004] CNCl+2OH - →CNO - +Cl - +H 2 o [0005] 2CNO - +4OH - +3Cl 2 →2CO 2 +N 2 +6Cl - +2H 2 o [0006] Then add acid to neutralize, and the cyanide is neutrally discharged after passing the standard, resulting in the loss of a large amount of sodium nitrate. If the sodium nitrate can be recovered,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/16C02F9/04
Inventor 姜忠智冯立明李玉芹吕顺一梁红静
Owner 烟台招金励福贵金属股份有限公司
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