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(1) Raw ore properties
Magnolia mercury mine located in Nandan county.
Before 1969, the ore was directly smelted by fire. After 1968 the mine mainly produces medicinal cinnabar, the state has invested 90-million yuan to build 50 tons / day ore dressing plant, in March 1969 started trial production in October the same year. The actual production capacity can reach 70 tons / day.
Cinnabar (mercury sulfide-containing more than 96%) to send payment City Jiangsu medicine company, concentrate cinnabar (mercury sulfide-containing 17% or more) transmission Jinchengjiang mercury smelter wet refining. The cost of producing one ton of cinnabar is 96~1500 yuan, and the cost of one ton of cinnabar mercury metal is 8,000~10,000 yuan, which is profitable every year.
The mine is powered by a self-contained diesel power station with an installed capacity of 1,840 hp. There is no river nearby, and the water source is lacking. The industrial water is extracted by the combination of the ravine water, the pit water, the tailings pond overflow water and the surface sewage.
(2) Process flow 1. Raw ore properties The ore is a low temperature hydrothermal mercury sulfide deposit. The main metallic minerals cinnabar, followed by a small amount of pyrite and marcasite like. The gangue minerals are mainly calcite and quartz , followed by barite , fluorite and a small amount of opal. The surrounding rocks are argillaceous limestone, carbonaceous shale and siliceous limestone. Cinnabar is mainly produced on the joints and bedding planes of carbonaceous shale, argillaceous limestone and siliceous limestone. The crystal grain size is at most 0.5 mm and the minimum is 0.009 mm, generally 0.027-0.12 mm. The colors are bright red, vermilion, maroon and so on. Cinnabar is often symbiotic with pyrite, showing fine veins and disseminated. The two are closely related to each other, and the fine aggregates of pyrite or gangue minerals are often wrapped in the aggregate of cinnabar.
2. Process flow The original ore of the original ore is passed through a 200 mm fixed grid sieve. The ore is larger than 200 mm ore. The ore is less than 200 mm and the ore is broken by an open circuit. The crushed product directly enters the rod mill, is ground to a 3 mm, and is roughly selected by a four-stage shaker to obtain four products of coarse concentrate, secondary concentrate, medium mine and tailings. After the re-grinding of the medium ore, the grading and re-election will be carried out, and the secondary concentrate and the coarsely-selected secondary concentrate will be selected for sweeping, and the secondary concentrate will be re-grinded and re-selected. The graded overflow of the secondary concentrate re-grinding and re-election system and the tailings are re-selected cinnabar concentrates, and all the shaker concentrates are cinnabar.
All re-election overflows and tailings except secondary concentrate re-election are concentrated and dehydrated. After the grit is re-ground, flotation is carried out. The concentrator overflows into the sedimentation tank and the resulting sand is directly floated. The flotation process is a rough selection, three sweeps, and a second selection. The flotation concentrate and the re-selected cinnabar concentrate are combined into a cinnabar product.
Re-selection of the shaker concentrate also requires manual washing and magnetic separation to obtain qualified cinnabar products. The mineral processing process and technical conditions are shown in the figure below.
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(III) Main equipment of the concentrator (below)
The mineral ceramsite used in the mine is unevenly embedded in coarse and fine particles. The combined process of multi-stage grinding, multi-stage washing, re-grinding and re-election, and re-election of tailings and overflow flotation is the first process of flotation. The cinnabar and cinnabar concentrates have been obtained. The production practice in the past few years proves that the process is reasonable and can obtain better mineral processing indicators.
At present, a section of open-circuit crushing is used, and the particle size of the final product cannot be guaranteed. The grain size of the rod mill reaches 70 mm, which increases the over-grinding of useful minerals and affects the production of cinnabar. The factory is now going to be changed to a two-stage crushing process.
The shaker concentrate (hair cinnabar) is concentrated in manual panning, which is labor intensive and inefficient. The mercury mine in Guizhou replaced the manual panning with a 450×1000 small shaker, and an electromagnet (homemade) was placed on the upper part of the shaker concentrate belt instead of the magnetic separator to remove iron. It has improved labor conditions and improved labor productivity, which can be further summarized and promoted.
At present, the flotation operation has not reached the design requirement (-200 mesh 90%) due to the fineness of grinding, the flotation operation is unstable, and the operation recovery rate is low, and further improvement is needed.
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