Treatment method of smelting waste liquor

Abstract

The invention relates to a treatment method of smelting waste liquor, in particular to a method for treating the heavy metal ion in the smelting waste liquor by the precipitation of high-alkaline and high-cyanide barren liquor generated in the cyaniding extraction process of gold and silver. The method is characterized by comprising the steps of: adding the smelting waste liquor in cyaniding barren liquor, wherein the pH value is 2-3; standing for precipitation to obtain precipitate and supernatant, wherein most of the heavy metal is precipitated in cyanide complex form and the impurity removal rate of the heavy metal in the supernatant is above 95%; adding cyaniding barren liquor to the supernatant to adjust the pH value to 8-9; precipitating and filtering part of the alkaline heavy metal ion; taking the supernatant after twice impurity removal by precipitation and filtration as refilling water for the cyaniding process; and returning to the cyaniding process for cyclic utilization. By adopting the method, the investment is not increased; the cyaniding barren liquor is used for treating the smelting waste liquor, and through controlling the pH value, the cyaniding barren liquor and the smelting waste liquor interact, thereby recycling the heavy metal ion in the waste liquor without increasing the treatment investment, realizing the zero discharging of the smelting waste liquor, treating the cyaniding barren liquor, reducing the sulfuric acid amount in the acidizing treatment of the barren liquor, and lowering the acidizing treatment cost of the cyaniding barren liquor.

Description

Technical field: [0001] The invention relates to a method for treating smelting waste liquid, in particular to a method for treating heavy metal ions in the smelting waste liquid precipitated by high-alkali and high-cyanide poor liquid produced in the process of extracting gold and silver by cyanidation. Background technique: [0002] As we all know, nitric acid removal of impurities, aqua regia solution gold replacement method and chlorination method are commonly used in gold cyanide mud. The pH value of the waste liquid generated during the production process is less than 1 and needs to be treated. Alkali neutralization and precipitation are often used. After heavy metal ions are released, they will cause environmental pollution. [0003] Cyanide barren solution is a high-alkali, high-cyanide liquid produced during the process of extracting gold and silver by cyanide method. The barren solution is closed-circuited in production, and the acidification method is often used t...

AI Technical Summary

Problems solved by technology

[0002] As we all know, nitric acid removal of impurities, aqua regia solution gold replacement method and chlorination method are commonly used in gold cyanide mud. The pH value of the waste liquid generated during the production process is less than 1 and needs to be treated. Alkali neutralization and precipitation are often used. Heavy metal ions are discharged, causing environmental pollution