Zhangjiakou gold mine in 1975, designed by the Beijing Nonferrous Metallurgy Design and Research Institute, designed capacity of 450t / d. In 1984, the Beijing Nonferrous Metallurgy Design and Research Institute and the United States David McGee jointly designed a 450t/d carbon slurry plant, which was completed and put into operation in 1986.
(1) Ore property: It is a medium-temperature hydrothermal fissure filled quartz vein type deposit. The ore is a sulfide-containing gold-containing quartz vein type. The main metal ore minerals are hematite and limonite ore, followed galena, white lead, lead, vanadium, magnetite, and a small amount of pyrite, copper ore and natural gold. Gangue minerals quartz, followed with a silk mica, feldspar, calcite, dolomite, and the like.
Most of the natural gold and metal minerals are symbiotic, among which the limonite contains gold. The ore density is 2.51 t/m 3 .
(2) Process flow: Gold concentrate was originally produced by single flotation. Since natural gold is mainly symbiotic with metal oxide minerals, the recovery rate of gold flotation is only 73~75%. To this end, in 1985 began to rebuild, the use of raw ore direct cyanide carbon slurry process new process. The product is a quality gold. The process flow is shown in the figure below.
The new process of extracting gold from carbon slurry began to be applied in foreign countries in the early 1970s. Because it can save capital investment and the production cost has dropped slightly, it has become widely adopted in the world in the 1980s. Zhangjiakou Gold Mine is the largest carbon pulp gold extraction plant in China. It has advanced technology, high automation level, and features of equipment and configuration. For example, high-efficiency concentrator, new leaching agitation tank, and automatic testing equipment are available for gold selection design. Learn from. This kind of process uses activated carbon to adsorb gold, which replaces the traditional method of solid-liquid separation by washing. This is more advantageous for gold mines with more oxidized ore or solid-liquid separation and low washing rate. Gold mines with tight construction sites also have special significance. After the plant was completed, the gold recovery rate increased from 73 to 75% to 90%. The process indicators, unit consumption indicators, and main equipment are shown in the table below.
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