CN-117488090-B - Preparation method of gold extraction agent

Abstract

The invention belongs to the technical field of gold extraction agents, and particularly relates to a preparation method of a gold extraction agent. The invention provides a preparation method of a gold extraction agent, which comprises the following steps of mixing sodium cyanate and iron powder, and carrying out a melting catalytic reaction to obtain the gold extraction agent. The invention adopts the iron powder as the catalyst, and can effectively promote the polymerization reaction of sodium cyanate. In the process of catalytic polymerization, the iron atoms can break carbon-nitrogen triple bonds in sodium cyanate into carbon-nitrogen double bonds, and one end of each carbon-nitrogen double bond is linked with a sodium atom. The gold extracting agent has no free cyanide ion and thus no toxicity. The obtained gold extraction agent can replace sodium with gold in gold ore in application process, and has effect of extracting gold. According to the test results of the embodiment, the gold extraction efficiency of the gold extraction agent provided by the invention is equivalent to that of sodium cyanide, and the gold extraction agent is safe, environment-friendly and nontoxic.

Inventors

• QIU PENGYUN
• GAN ZHANGHUA
• JIANG SHIJUN
• Zeng Quande
• WU CHUANDONG

Assignees

• 湖南立德科技新材料有限公司

Dates

Publication Date

20260505

Application Date

20231102

Claims (4)

1. 1. The preparation method of the gold extraction agent is characterized by comprising the following steps: mixing sodium cyanate and iron powder, and carrying out a melting catalytic reaction to obtain the gold extracting agent; The mass of the iron powder is 0.8-1.2% of the mass of the sodium cyanate; the temperature of the melt catalytic reaction is 800-850 ℃, and the heat preservation time is 4-6 h.
2. 2. The method according to claim 1, wherein the particle size of the iron powder is 60 to 100 mesh.
3. 3. The production method according to claim 1, wherein a rate of temperature rise to the melt catalytic reaction temperature is 2 to 4 ℃.
4. 4. The method according to claim 1, further comprising cooling, casting and pulverizing the obtained product in this order after the melt-catalyzed reaction; the cooling temperature is 700-750 ℃.

Description

Preparation method of gold extraction agent Technical Field The invention belongs to the technical field of gold extraction agents, and particularly relates to a preparation method of a gold extraction agent. Background Gold belongs to rare noble metals, important strategic resources and money reserve resources. Meanwhile, gold is used as an important industrial raw material, and has important application in the departments of jewelry industry, medical treatment, electronic industry, modern communication, aerospace industry and the like. Currently, gold is mainly produced by the cyanidation method in the industrial production of China. The cyanidation method utilizes aqueous cyanide solutions to dissolve gold in minerals under conditions of oxygen dissolution or bubbling of oxygen into the solution. The process is mature and simple, low in cost, good in adaptability and high in recovery rate, and is suitable for large-scale industrial production. However, the extraction process of the cyanidation method has the problems of high pollution, long leaching time, poor selectivity on metal ions, easy interference by impurity ions and the like, and cyanide is a highly toxic substance, seriously pollutes water and soil and endangers the environment and human health. Therefore, research on novel environment-friendly non-cyanide gold extraction agents to replace sodium cyanide in industrial production is urgently needed. Disclosure of Invention The invention aims to provide a preparation method of a gold extraction agent, and the gold extraction agent obtained by the method provided by the invention has no cyanide ions, is safe and environment-friendly and has higher gold extraction rate. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a preparation method of a gold extraction agent, which comprises the following steps: Mixing sodium cyanate and iron powder, and carrying out melt catalytic reaction to obtain the gold extracting agent. Preferably, the particle size of the iron powder is 60-100 meshes. Preferably, the mass of the iron powder is 0.8-1.2% of the mass of the sodium cyanate. Preferably, the temperature of the melt catalytic reaction is 800-850 ℃, and the heat preservation time is 4-6 hours. Preferably, the temperature rising rate of the molten catalytic reaction temperature is 2-4 ℃ per minute. Preferably, after the melt catalytic reaction, the method further comprises the steps of sequentially cooling, casting, forming and crushing the obtained product; the cooling temperature is 700-750 ℃. The invention provides a preparation method of a gold extraction agent, which comprises the following steps of mixing sodium cyanate and iron powder, and carrying out a melting catalytic reaction to obtain the gold extraction agent. The invention adopts the iron powder as the catalyst, and can effectively promote the polymerization reaction of sodium cyanate. Sodium cyanate has the molecular formula NaOCN and the molecular structure of Na-O-C.ident.N, wherein the carbon-nitrogen triple bond is cyano. In the process of catalytic polymerization, the iron atoms can break carbon-nitrogen triple bonds in sodium cyanate into carbon-nitrogen double bonds, and one end of each carbon-nitrogen double bond is linked with a sodium atom. After the reaction is completed, free cyanide ions are not existed in the product, so that the product has no toxicity, and the obtained gold extracting agent can replace gold in gold ore in the application process, thereby playing the role of extracting gold. According to the test results of the embodiment, the gold extraction efficiency of the gold extraction agent provided by the invention is equivalent to that of sodium cyanide, and the gold extraction agent is safe, environment-friendly and nontoxic. Detailed Description The invention provides a preparation method of a gold extraction agent, which comprises the following steps: Mixing sodium cyanate and iron powder, and carrying out melt catalytic reaction to obtain the gold extracting agent. In the present invention, all the preparation materials are commercially available products well known to those skilled in the art unless specified otherwise. In the present invention, the particle size of the iron powder is preferably 60 to 100 mesh, more preferably 70 to 90 mesh, and even more preferably 80 mesh. In the present invention, the iron powder is preferably 0.8 to 1.2% by mass, more preferably 0.9 to 1.1% by mass, and still more preferably 1.0% by mass of the sodium cyanate. The mixing process is not particularly limited, and the two can be uniformly mixed by a method well known to those skilled in the art. In the invention, the temperature of the melt catalytic reaction is preferably 800-850 ℃, more preferably 810-840 ℃, still more preferably 820-830 ℃, the temperature rising rate from the temperature rising to the melt catalytic reaction temperature is preferably