Environment-friendly high-efficiency gold leaching agent synthesis method

A synthesis method and technology of gold leaching agent, which is applied in the synthesis field of environment-friendly high-efficiency gold leaching agent, can solve the problems of biological oxidation process damage, insufficient energy uptake by cells, oxidative phosphorylation obstruction, etc., so as to reduce metathesis reaction and increase reactant Utilization rate, the effect of promoting the generation of cyanate

Active Publication Date: 2019-05-24
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the disappearance of the catalytic effect due to the structural change of the enzyme, electrons can no longer be obtained from the substrate, and the E(Fe 3+ ) reduced to E(Fe 2+ ), due to the interruption of this step reaction, the entire biological oxidation process is destroyed, and the molecular state O in the blood 2 It can no longer be used by tissue cells, oxidative phosphorylation is blocked, ATP synthesis is reduced, and cells are suffocated due to insufficient energy intake
It can be seen that the presence of free cyanide in the drug is dangerous, and the greater the amount, the greater the toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a synthetic method of an environment-friendly high-efficiency gold leaching agent, the specific process is:

[0022] Weigh an appropriate amount of medicine according to the ratio of ferric nitrate: sodium cyanate: sodium carbonate mass ratio of 10:50:20, mix and grind for 10 minutes, after mixing, put it in the atmosphere furnace, press N 2 :CO 2 :O 2 Adjust the reaction atmosphere with a volume ratio of 12:15:73 and slowly raise the temperature to 700°C, keep it warm for 30 minutes, and cool to room temperature to obtain an off-white or dark gray melt, which is an environmentally friendly high-efficiency gold leaching agent, with a yield of more than 97%.

[0023] Weigh 0.092g of the above environment-friendly high-efficiency gold leaching agent and dissolve it in 46mL of water, add 20g of gold ore powder, shake and leach in the oscillator for 24h, filter, wash the tailings, and finally use atomic absorption to determine the gold content in t...

Embodiment 2

[0025] Weigh an appropriate amount of medicine according to the ratio of iron hydroxide: sodium cyanate: sodium carbonate mass ratio of 10:50:20, mix and grind for 10 minutes, after mixing, put it in the atmosphere furnace, adjust the N 2 :CO 2 :O 2 The volume ratio is 12:15:73, and the temperature is slowly raised to 900°C, kept for 20 minutes, cooled to room temperature, and an off-white or dark gray melt is obtained, which is an environmentally friendly high-efficiency gold leaching agent. The product yield is greater than 98%.

[0026] Weigh 0.092g of gold leaching agent and dissolve it in 46mL of water, add 20g of gold ore powder, shake and leach for 24h in the oscillator, filter, wash the tailings, and finally use atomic absorption to measure the gold content in the raw ore and tailings, and calculate the gold The leaching rate is 68.8%, which is lower than the leaching rate (80.2%) of sodium cyanide under the same conditions, but the total cyanide concentration in the...

Embodiment 3

[0028] According to the ratio of ferric carbonate: sodium cyanate: sodium carbonate mass ratio of 10:50:20, take an appropriate amount of medicine, mix and grind for 10 minutes, after mixing, put it in the atmosphere furnace, adjust the N 2 :CO 2 :O 2 The volume ratio is 12:15:73, and the temperature is slowly raised to 400°C, kept for 20 minutes, cooled to room temperature, and an off-white or dark gray melt is obtained, which is an environmentally friendly high-efficiency gold leaching agent. The product yield is greater than 98%.

[0029] Weigh 0.092g of gold leaching agent and dissolve it in 46mL of water, add 20g of gold ore powder, shake and leach for 24h in the oscillator, filter, wash the tailings, and finally use atomic absorption to measure the gold content in the raw ore and tailings, and calculate the gold The leaching rate was 76.8%, lower than the leaching rate (80.2%) of sodium cyanide under the same conditions, but the total cyanide concentration in the gold ...

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Abstract

The invention discloses an environment-friendly high-efficiency gold leaching agent synthesis method. The environment-friendly high-efficiency gold leaching agent synthesis method comprises the specific steps that iron salt, sodium cyanate and sodium carbonate are mixed and placed in a reactor, the reaction atmosphere is controlled according to the volume ratio of N2: CO2: O2 being [5-25]:[5-30]:[45-90], slowly heating is carried out to reach 400-900 DEG C, the temperature is kept for 10-50min, and cooling is carried out to normal temperature to obtain an environment-friendly high-efficiency gold leaching agent; and the mass ratio of iron salt, sodium cyanate and sodium carbonate is [2-30]:[40-85]:[5-40]. According to the environment-friendly high-efficiency gold leaching agent synthesis method, by controlling the reaction atmosphere, the metathesis reaction in the high-temperature process can be effectively reduced, the utilization rate of reactants is greatly improved, the generationof cyanate is promoted, the chelation of cyanate and iron salt is catalyzed, the generation of cyanide is inhibited, so that the total cyanide concentration in gold leaching tail liquid is greatly reduced, and the leaching rate is ensured.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a method for synthesizing an environment-friendly high-efficiency gold leaching agent. Background technique [0002] At present, 85% of domestic and foreign gold production is produced by cyanidation. The cyanide gold extraction process has the characteristics of simple and easy operation, strong adaptability, high leaching rate, and stable production process. Its disadvantage is that the gold leaching agent used is a highly toxic agent, which is extremely harmful to the environment. With the continuous improvement of global environmental awareness and the improvement of environmental protection systems, more and more attention has been paid to the environmental protection of mines. The development of cyanide-free or low-cyanide processes has become a general trend in the industry. Finding a chemical that can replace sodium cyanide is one of them. an important direction....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/04
CPCY02P10/20
Inventor 陈景河衷水平苏秀珠陈杭李国尧王俊娥
Owner ZIJIN MINING GROUP
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