Ore dressing and processing of talc (1)

(I) Beneficiation and processing methods China's talc beneficiation generally adopts hand-selection and dry-grinding air classification. Although some factories and mines have established a selection process based on flotation columns, they have not been promoted and applied. The processes of mineral processing research and testing that have been carried out at present include photoselection, bleaching, dry or wet magnetic separation, hydrocyclone sorting, scrubbing and sedimentation concentration, centrifugal grading, spray drying, micronized process and talc stratification and extinction. Special processes such as bacteria.
In addition to the grinding operation of talc processing, the concentrator can also use the flotation process for the selection of low-grade ore, and comprehensive recovery of beneficial associated minerals. The principle flow of talc milling and flotation is shown in Figure 1 and Figure 2, respectively.

Crushing equipment: The crushing equipment commonly used in talc mines is a jaw crusher .
Milling equipment: including ordinary grinding equipment and ultra-fine grinding equipment. Ordinary grinding equipment is commonly used in Raymond mill, mainly used to produce 200, 325 mesh talc powder; ultra-fine grinding equipment includes flat, circulating tube, fluidized bed and other jet mills, mainly used for production less than 5μm Ultrafine talcum powder.
(II) Dressing practice 1. Liaoning Haicheng talc mine
Haicheng talc mine was built in 1949 in Fanjiabaozi Village, Mafeng Town, 24km southeast of Haicheng County. It has become a large-scale talc enterprise with an annual output of 150,000 tons of talc and 160,000 tons of talc processing capacity.
The ore is white, gray, pink, egg blue, etc. The structure is in the form of blocks, flakes and medium coarse particles. The main mineral is talc (about 55%), and the associated minerals are magnesite (42%). quartz (1.5%), gangue minerals pyrite (0.5%) and small amounts of apatite, chlorite, serpentine, tourmaline, tremolite, rutile, graphite and the like.
The mine currently only uses a dry hand selection process. The stope-350mm ore is selected by the first-class block of +100mm, the -100mm ore is sieved to separate the second block of -30mm, and the -100+30mm grain size is selected by hand to select the first block and the third grade ore. The main technical and economic indicators are as follows: treatment capacity 115kt/a, raw ore grade 50%, concentrate yield 50%, concentrate grade 94%, concentrate recovery rate 80%, tailings grade 15%, ore dressing power consumption 4.1kW•h /t raw ore.
Talc production is divided into two parts. The first part adopts Raymond mill, which mainly produces 200,325 mesh talcum powder. The treatment capacity is: 325 mesh 3.2~3.8t/h, 200 mesh 4.4~4.8t/h; the grinding grain size is less than 40mm; the original ore grade (SiO ₂ content) ): 57% first level, 53% second level, 35% third level; energy consumption 29~31kW•h/t raw ore. The second part of the fine talcum powder production line is the process equipment imported from Italy in 1976. The production line consists of four parts: preheating and drying part, grinding part, ultra-fine grinding part and air compression system. The talc grinding process is shown in Figure 3. The main and auxiliary equipments are: 6 sets of 250mm×400mm jaw crusher, 6 sets of self-centering vibrating screens of SZZ 1 250mm×2 500mm, 6 sets of 5R Raymond mills and 2 sets of GR-180 grinding mills (for jet mills). Preparation, made in Italy), a flat jet mill (made in Italy).

Chain Conveyor

QUANTUM En Masse and Drag Chain Conveyors are used to convey powdery and granulated products across a range of inclined and vertical installations.