A kind of environment-friendly gold and silver leaching agent and preparation method thereof

Abstract

The invention discloses an environment-friendly gold and silver leaching agent and a preparation method thereof. The leaching agent is prepared from, by weight, 1-60 parts of sodium cyanate, 1-15 parts of sodium chloride, 1-60 parts of carbamide, 1-40 parts of potassium ferrocyanide, 1-40 parts of tetrasodium hexacyanoferrate, 1-50 parts of soda and 1-15 parts of sodium thiosulfate. The preparation method of the leaching agent comprises the steps that the materials are prepared according to a proportion, and added into a mixing agitator to be evenly stirred, and then the mixture enters a stainless steel reaction still to be subjected to a high-temperature reaction for 3.5 h to 5.5 h at the temperature of 450 DEG C to 860 DEG C; and the mixture is crushed into the size of 0.1 cm to 2 cm through a crusher after being discharged and cooled, and the product is weighed and filled to from a finished product after being inspected to be qualified. According to the environment-friendly gold and silver leaching agent, no harmful or toxic ingredients are included in the product, the leaching rate is high, the applicable mine types are wide, and the raw materials are easy to buy; the technological process of production is short, cost is low, and the product quality is easy to control; and the leaching agent is nonhazardous to production personnel and livestock, and pollution to the ecological environment is avoided.

Description

technical field [0001] The invention belongs to the technical field of precious metal leaching, and in particular relates to an environment-friendly gold and silver leaching agent and a preparation method thereof Background technique [0002] The raw materials currently used in gold and silver ore leaching agents in the world are mainly cyanide, which uses cyanide ions in cyanide to form complex alloys and complex silver with gold and silver, and then adsorbed by activated carbon, zinc Silk or zinc powder replacement, to achieve the purpose of leaching gold and silver. Its problems are long leaching time, large consumption of gold and silver ores containing sulfur, arsenic, iron, antimony and sulfuric acid slag (industrial by-products), and low leaching rate; especially for humans and livestock, it is extremely harmful and easy to kill , the aqueous solution causes damage to water bodies and vegetation, and seriously pollutes the environment. With the National Twelfth Five...

AI Technical Summary

Problems solved by technology

Its problems are long leaching time, large consumption of gold and silver ores containing sulfur, arsenic, iron, antimony and sulfuric acid slag (industrial by-products), and low leaching rate; especially for humans and livestock, it is extremely harmful and easy to kill , the aqueous solution causes damage to the water body and vegetation, and seriously pollutes the environment

[0004] The toxicology of cyanide is complicated, and the treatment and decontamination technology content is high. Once a leakage accident occurs, it will be accompanied by various environmental pollutions such as air, water, and soil, and the harm to environmental organisms, especially aquatic organisms, is more serious.

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