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In the new and most far-reaching process of cyanide gold extraction, the trial production began in 1961 and the perfect "Carbon in pulp" using activated carbon to adsorb gold from cyanide leaching pulp in 1973, and improved later. The "Carbon in leach" process, which adds activated carbon to the slurry while simultaneously leaching and adsorbing gold, is the latest technology in modern gold production. It has lower production costs and simpler operation. Therefore, most of the modern gold extraction plants use carbon pulp extraction technology.
The carbon slurry gold extraction process is a gold extraction method in which activated carbon is put into cyanide pulp, the gold which has been dissolved therein is adsorbed onto the activated carbon, and gold is extracted from the activated carbon. The carbon slurry method retains the main process of leaching in the conventional cyanidation process (CCD), eliminating the two subsequent processes of liquid-solid separation and zinc precipitation, and instead of carbon adsorption, desorption and electrolysis, thus fundamentally solving the conventional The problem of cyanidation has become the most viable new process in the whole mud cyanidation process.
The process has achieved good technical and economic indicators at home and abroad, and has been flourishing. Since the introduction of the Homestake Carbon Pulp Plant in the United States in 1973, the carbon extraction process has been widely used worldwide. Today, many countries in the world have established carbonization cyanide gold extraction plants of different sizes. Among them, the United States has a large number. South Africa has established nearly 20 carbon pulp plants since the mid-to-late 1970s. Among them, six large plants have been built in the 1980s, processing nearly one million tons of ore per month, and some are small to deal with low-grade waste ore. The larger plant is the 3,500 t Bessa gold ore slurry plant that was put into operation in 1982. The world's largest CIP plant may be Papua New Guinea Oak thatti gold mine copper cyanide plant. In 1985, China's self-designed and constructed two gold mines in Henan and a gold mine in Jilin were put into operation one after another; two gold mines in Hebei, a gold mine in Hebei, and two gold mines in Shaanxi, were also designed and introduced in 1987. Put into production. At present, more than a dozen carbon pulp plants have been completed and put into production nationwide. In recent years, it has developed to deal with gold concentrates. In short, the development momentum of the carbon pulp plant is still increasing.
The main advantage of the carbon slurry method is that the slurry washing and solid-liquid separation are omitted, and the granular activated carbon is directly used to adsorb gold from the slurry to replace the washing of the leaching slurry, the solid-liquid separation and the clarification, degassing and zinc replacement of the leachate. It simplifies the industrial production process, significantly improves efficiency, greatly reduces equipment and infrastructure investment, and reduces production costs. Under normal circumstances, the carbon slurry method can save 25% to 50% of investment, and the production cost can be reduced by 5% to 35%. The Masbate charcoal pulp mill in the Philippines, which was built in 1979 and has a daily processing capacity of 3,500 tons, is For example, the total construction investment is $1.5 million. If a CCD process cyanide plant of the same size is built, only the counter-current decanting and washing part will cost USD 3.25 million, and the total investment will cost USD 4.45 million. Compared with the two, the carbon pulp process plant saves about 66% of the investment. However, if a small charcoal plant for processing flotation concentrates is built, including flotation, the investment and production costs are similar to those of the CCD process. The ratio of the two is about (0.94~0.99). ):1.
Overview of carbon slurry
The carbon slurry method is one of the modern new cyanidation gold extraction processes. As mentioned above, most of the world's total gold production has been produced by cyanidation. However, the early conventional cyanidation, that is, continuous countercurrent decantation washing (CCD) -zinc replacement method, requires a series of operations such as washing of slurry, solid-liquid separation, and clarification of decanting, degassing and gold replacement, equipment and infrastructure. investment, land and more, long and complex process, gold and silver remain in the job for a long time in the process, a large zinc consumption, low grade gold clay sediment, thereby affecting cash flow, increasing the difficulty of refining the next and so on. In order to further simplify the cyanidation process, increase production efficiency, reduce costs, and strengthen the cyanide gold extraction method, people continue to research and improve the CCD process, and also constantly create a new cyanide gold extraction process, carbon slurry method to raise gold Craft is one of them.