Carbon slurry gold extraction process

There gold extraction process a plurality of gold ore processing equipment, gold extraction process CIP process is one method for extracting gold cyanide, gold material after the completion of cyanide leaching, gold cyanides carbon adsorption process.
People who have been engaged in gold mining operations in the early days have already discovered that gold ore beneficiation equipment technology can be used to adsorb gold from the solution. Since the cyanide slurry has to be separated by solid-liquid separation to obtain a clear liquid and the activated carbon cannot be returned, this method cannot be industrially competitive with the widely used zinc substitution method. Later, directly from the activated carbon adsorption of gold cyanide pulp, thus eliminating the need for solid-liquid separation operations; gold loaded activated carbon desorption mixture was neutralized with sodium hydroxide and sodium cyanide gold and silver, the process may return the activated charcoal used. Therefore, this year, the development of carbon slurry method has become a new process for gold extraction.
The carbon slurry gold extraction process has higher requirements on the beneficiation equipment. Each section of the equipment has its own characteristics and functions. The process includes the main operations such as raw material preparation and activated carbon regeneration. The process flow is shown in the figure.

Schematic diagram of carbon extracting process of gold ore beneficiation equipment

The process of gold ore beneficiation equipment in the process of gold extraction is as follows:
(1) Preparation of raw materials The ancient gold material is ground to a size suitable for cyanidation, generally less than 28 mesh, and impurities such as wood chips are removed, and the concentration of the leached pulp is preferably 45%-50% by concentration and dehydration.
(2) Stirring leaching The same as the conventional cyanidation method, generally 5-8 stirring tanks.
(3) Carbon adsorption cyanide slurry is leached out of the stirred adsorption tank (carbon slurry tank). The gold mine is equipped with a format sieve and a slurry riser in the suction tank, which is used to realize the reverse flow of activated carbon and slurry, and adsorb the dissolved gold in the slurry. The bridge screen can reduce the wear of activated carbon. The screen hole of the front bridge screen is easily blocked by activated carbon, and it needs to be cleaned with compressed home gas.
(4) Desorption of gold-loaded carbon can be desorbed by four methods. Desorption of hot caustic cyanide solution;
2 low concentration caustic sodium cyanide solution plus alcohol desorption 3 desorption under caustic and sodium cyanide solution under heating and pressure; 4 high concentration caustic sodium cyanide solution desorption.
(5) Electrowinning method or conventional zinc powder replacement precipitation gold The gold-carbon solution method is used to obtain a high-grade noble liquid containing gold up to 600g/m3, and gold powder is obtained by electrowinning or zinc replacement method, and sent to smelting to obtain gold ingot.
(6) Regeneration of Activated Carbon The activated carbon after desorption is first acid washed with dilute sulfuric acid (nitric acid) to remove aggregates such as carbonates. After several times of returning to the net, thermal activation is required to restore the adsorption activity of carbon.
The carbon slurry method is mainly applied to gold-bearing oxidized ore with high sludge content. Because of the high stone content and difficult solid-liquid separation, the existing filter can not effectively separate the precious liquid and the slag, so the conventional cyanidation method It is impossible to obtain better technical and economic indicators. Practice shows that the carbon slurry method has achieved good results in the industry, and the gold ore beneficiation equipment customized for the carbon slurry process is also favored by the current market.

Nitrogen Fertilizer

Nitrogen fertilizer refers to a unit fertilizer with nitrogen (N) as the main component, with an N-marked amount, and applied to the soil to provide plant nitrogen nutrition. Nitrogen fertilizer is the world's largest fertilizer production and use of fertilizer varieties; Appropriate nitrogen fertilizer dosage plays an important role in increasing crop yield and improving the quality of agricultural products. Nitrogen fertilizer can be divided into ammonia nitrogen fertilizer, ammonium nitrogen fertilizer, nitrate nitrogen fertilizer, ammonium nitrate nitrogen fertilizer, cyanamide nitrogen fertilizer and amide nitrogen fertilizer according to nitrogen-containing groups. The main raw material for the production of chemical nitrogen fertilizer is synthetic ammonia (the Haber method device for generating synthetic ammonia was built in 1909 and first industrialized in Germany, becoming the basis of the nitrogen fertilizer industry), in the 1940s and 1950s, ammonium sulfate was the most important nitrogen fertilizer variety; In the 1960s, ammonium nitrate was added; Since the 1970s, urea has become the dominant nitrogen fertilizer variety. Ammonium bicarbonate is one of the main nitrogen fertilizer varieties produced in China in the 1980s.