The plant designed in 1966 by the Changsha Nonferrous Metallurgy Design and Research Institute, August 1970 production, designed capacity of 150t / d.
(1) Ore properties: The ore is a low-temperature hydrothermal fracture-type integrated layer strip-shaped single- mercury ore with a low ore grade and a mercury content of 0.1 to 0.2%. The type of ore is simple, all of which are carbonate ore, and only the local carbonates are found in the local area. According to the state of cinnabar production, ore is basically divided into two main types: 1) sparsely disseminated cinnabar carbonate ore, accounting for about 85% of the total ore. 2) Pulsed cinnabar carbonate ore, accounting for about 15%. The mineral composition of the two types of ore is basically similar. In addition to cinnabar, metal minerals have very little mineral content. The gangue minerals are mainly calcite and dolomite. The content of calcite in sparsely disseminated ore is 70~90%, and the content of dolomite in veined ore is as high as 75~95%, followed by barite , quartz and trace amount. Fluorite , gypsum, etc. The chemical analysis of the ore is shown in the following table:
The cinnabar is impregnated, reticular, star-shaped and membranous in the dolomite transformed by dolomitization , recrystallized petrochemical and dolomitization . The cinnabar is in the shape of his crystal, and the particle size varies from 0.3 to 1.5 mm, the maximum is 2 to 5 mm, and the minimum is 0.05 mm. Some cinnabars contain barite, dolomite and secondary gangue minerals, and some cinnabars are encased in calcite and barite.
The ore hardness is f=8~12, the ore density is 2.75t/m 3 , and the loose density is 1.65t/m 3 .
(2) Process flow: The maximum particle size of the ore is 350~0mm. The two-stage open process is adopted, and the final product size is 40~0mm. The grinding uses a closed circuit; the grinding size is less than 0.074mm75~80%. The concentrate is dewatered in two stages, and the final concentrate contains about 12 to 14% water. The process flow and technical conditions are as follows:
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