Sand-tin deposits, sand-tungsten deposits, brown-saw-saw deposits, rare earth (monazed) deposits in Yunnan, Guangdong, Guangxi and other provinces and autonomous regions; gold deposits in Heilongjiang, Jilin, Inner Mongolia, Shandong, Hunan, Sichuan and other provinces and autonomous regions It belongs to Hecheng alluvial deposit. Alluvial sand deposits are formed by secondary enrichment in nature and often contain a variety of non-ferrous metals, rare metals and precious metal minerals.
The alluvial sand deposit is a primary ore that is transported by the water stream to the middle and lower reaches of the river, and is formed by the slower water flow rate. The dense minerals are distributed in the coarse sand or gravel layer and form an enrichment zone at their bottom. The natural panning process experienced by such deposits is not very strong, and there are more gravel and clay in the ore, and the distribution is uneven.
Alluvial sand mines are generally mined by a water gun-sand pump, a shovel-type bulldozer, a wheeled bucket or a sand mining ship. The useful minerals in the ore are essentially dissociated from the monomer, so there is generally no need for crushing and grinding. The mined sand is first sieved to remove the uncontaminated gravel, and the mud containing ore is de-sludged and then sent to the sorting. The content of high-density minerals in sand mines is generally not high, so it is usually firstly selected by a large amount of equipment (such as large jigs, cone concentrators , coarse-grain chutes, etc.), and the obtained coarse concentrates are sent to the selected ones. Processed in the workshop or centrally selected plant, resulting in a single mineral concentrate.
1 Re-election of Yunnan Shisha Tin Mine
Yunnan Tin Industry Co., Ltd. is located in Gejiu City, Yunnan Province. The old mining area belongs to the sand-tin deposit, accounting for 16% of China's tin resource reserves.
The types of ore processed by Yunxi's concentrating plant are mainly residual slope sand deposits, oxidized vein tin ore, cassite polymetallic sulfide ore, and tailings. The mineral composition of the residual slope sand deposit and the oxidized vein tin ore is similar, and the cassiterite has fine grain size and rich mud. The tin and iron minerals are closely combined, and the associated lead , zinc , copper, tungsten, indium , antimony and cadmium. All elements are more difficult to recycle. Compared with the two, the tin grade of the vein tin ore is higher, the lump ore is more, the size of the cassiterite is slightly thicker, and the mud content is relatively less.
The ore processing process for treating oxidized ore is basically the same, consisting of three major systems: raw ore preparation, ore dressing, and slime sorting. The ore preparation system of the residual slope sand deposit tin mine includes operations such as washing, crushing, sieving, and grading desilting. The ore (+0.037mm grain size) is sorted by the full shaker sorting process shown in Figure 4, which mainly includes 3 sections of grinding, 3 sections, coarse concentrate concentrate pre-rewashing, medium mine re-grinding and re-election. , overflow processing alone and other operations. The slime (-0.037mm grain size) system includes rough selection of centrifugal concentrators, belt chute selection, grooving mud boring machines or six-layer suspended mud shaker sweeping (see Figure 5). The production indicators of the whole plant are: 0.3% ~0.53% of the original ore grade, 45%~50% of the tin concentrate grade, and 53%~57% of the total tin recovery rate, of which the tin recovery rate of the slime system accounts for 5%.
Separation process of residual slope sand deposit tin ore mine sand system
Separation process for re-election of residual slope sand deposits
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