Non-Cyanide Gold Extraction Process

 The successful development of Sinogold Pro gold extraction method is a major innovation in the gold dressing industry, whichhas revolutionized the cyanidation gold extraction method worldwide for 100years, and can be regarded as a major breakthrough in the world environmentalhistory. Won the national invention patent and the certification of thenational authority, this technology does not change the original cyanidationequipment, does not change the original cyanidation process, because of theleaching speed, high recovery rate, strong adaptability to all kinds of ore,can on the property gold and other advantages. Pro gold leaching method will be the good news for gold production enterprises.

Generally, the Pro gold leaching method can be divided into stirring process and percolation process. Among them,stirring is mainly used to treat flotation gold concentrate, or whole mud;However, the leachate is mainly used to treat low grade gold ores.

Carbon pulpextraction process (CIP method and CIL method) is to put activated carbon into pulp,adsorb dissolved gold on activated carbon, and then extract gold from activatedcarbon, mainly including the preparation of leaching materials, stirringleaching and countercurrent carbon adsorption, gold-loaded carbon desorption,electrodeposition electrolysis, smelting ingots, carbon regeneration and otheroperations.

Carbon pulp method (CIP) : firstleach, then add activated carbon to adsorb gold in pulp;

Carbon leaching (CIL) : activatedcarbon is added to the leaching tank and the leaching and adsorption arecarried out simultaneously.

Leaching and adsorption are twoseparate operations in CIP process. In the adsorption operation, the leachingprocess has been basically completed, and the size, number and operationconditions of the adsorption tank are determined by the adsorption parameters.

In the CILprocess, leaching and adsorption are carried out simultaneously. In general,the leaching operation takes longer than the adsorption operation, so the size,aeration and dosing of the tank are determined by the leaching parameters.Since the adsorption rate is a function of the dissolved gold concentration inthe solution, in order to increase the concentration of dissolved gold in thefront adsorption tank and increase the leaching time, it is usual to add 1 ~ 2levels of preleaching before leaching and absorption.

Heap leachingis mainly will transfer to prepared in advance of the ore mining yard on theheap, or directly on the storage of waste rock or low grade ores, leachingliquid spray or percolation, and make the solution produced by ore percolationleaching, leaching liquid cycle for many times, repeatedly spray ore heap, andthen collected leachate, reoccupy activated carbon adsorption or zincreplacement, the poor fluid return cycle used for heap leaching operations.

It is commonly chosen that theheap leaching sites are located in the hilly areas with a gentle slope (naturalgradient 5-15) close to the stope and convenient for transportation. Firstly,the weeds and floating soil are cleared and then the environment is rammed. Itis built into a foundation with a gradient of around 5 wine, with the height onboth sides slightly lower in the middle, so that the leach fluid can beconcentrated into the storage tank and the storage yard is covered withgeotechnical film to prevent leakage. Soil Banks of 0.4 meters were builtaround the yard and used as drains to prevent rainwater from flowing into theyard. A large lean ore 0.3 m thick is deposited before the ore is piled.

Heap leaching method has lowproduction cost and can be quickly put into production. The heap leaching scalecan be large or small, and each heap of ore can reach tens of thousands oftons. Heap leaching or pelletizing after ore crushing to a certain size.