The production capacity of the beneficiation plant is 1800tpd, it is for cassiterite polymetallic sulfide ore.
The ore is cassiterite hydrothermal polymetallic sulfide ore. The main metallic minerals are pyrrhotite, pyrite, chalcopyrite, pyrite, sphalerite, scheelite, cassiterite, natural bismuth etc.. The gangue minerals are mainly pyroxene, calcite, quartz and so on. The hardness of the ore is 10-12, the density is 3.8t/m3, the loose density is 2.2t/m3, the rest angle is 35-38 degrees, and the ore water content is 4%.
The content of sulphide in the raw ore is about 50%, which is mainly pyrrhotite. Along with the mine stope development depth increased, tin grade has been decreased from 0.8% to 0.4-0.5%, tungsten dropped from 0.14% to 0.07%, copper grade decreased from 0.6% to 0.3-0.4%, the zinc grade decreased from 1.2% to 0.5-0.9%, sulfur decreased from 19% to 9%; and the ore mud content was increased year by year, less than 0.074mm particle level increased from 6.8% to 13%.
In cassiterite magnetic pyrite, fluorite, spodumene ore block, granular irregular or incomplete crystal output, particle size is generally 0.0085-0.14mm. There is also a small amount of granular crystal composed of cassiterite or irregular aggregates, particle size up to 3mm.
Pyrrhotite is mainly an irregular large piece of production. There are often pyroxene, fluorite, calcite and chalcopyrite in the ore block. Chalcopyrite granular irregular or better crystals in pyroxene, pyrrhotite block, and calcite and fluorite with particle size of 0.01-4mm part of chalcopyrite in pyroxene crystals, reticular, vein or irregular grid, pulse width of 0.017-3mm, usually 0.05-0.12mm, less than 0.15mm only monomer.
Tungsten minerals are scheelite, crystal size is fine, only less than 0.074mm monomer. The natural bismuth is in the presence of thin particles in pyrrhotite with a particle size of about 0.003-0.04mm. Sphalerite is irregular granular in pyrrhotite, fluorite and pyroxene ore, with a grain size of 0.05-0.075mm.
The analysis of multiple elements in the raw mineral is shown in Table 1. The mineral composition of the ore is shown in Table 2
Table 1. The analysis of multiple elements in the raw mineral
Table 2. mineral composition of the ore
The crushing and screening stage of the production line is three stages and one closed process. After the change of the ore property, the water content of the mud increased, which affected the normal operation of the ore transportation, ore unloading, screening and other equipments, and then increased the washing equipment.
The combined process of flotation, gravity and flotation is adopted. Practice shows that the process of fine disseminated cassiterite polymetallic sulfide ore is very suitable. In addition to recovering metal tin, copper and tungsten, the recovery of bismuth, sulfur and zinc is also carried out at the same time. The natural bismuth of associated metals is dispersed in various products and intermediate products, and enriched in sulfide minerals in addition to the enrichment of Sn - W mixed concentrate. According to the characteristics of natural bismuth density than the magnetic pyrite large, desulfurization product separation in copper sulfur separation of sulfur concentrate and tungsten tin in tabling bismuth, can get a taste of 12.83%, the recovery rate of about 4.3% of bismuth concentrate.
About 75% of zinc is concentrated in the foam products of copper and sulphur floatation. Through the separation of copper and sulfur, 36% of zinc into the copper concentrate, and 39% of the zinc into the sulphur concentrate. Zinc concentrates with a grade of 30% and a recovery rate of about 21% can be obtained by concentrating zinc. The production practice shows that the zinc grade of the original ore can be recovered to the final concentrate of the smelting requirement when the grade of zinc is above 0.7%.
According to the needs of the production process, the suitable equipment is configured, and the actual operation is smooth and the maintenance is convenient. List of main equipment table 3.
Table3.List of main equipment
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