The pilot plant is the Ministry of Chemical Industry Design and Research Institute of Chemical Mining phosphorus ore and the king set a common design. The design scale of the pilot plant is 50t/d, and the actual ore volume is 60~70t/d.
(1) Ore property: The phosphate rock is a large-scale shallow marine sedimentary phosphate rock deposit. The ore is a medium-low grade siliceous calcareous phosphate rock. The phosphorus mineral is closely symbiotic with the gangue mineral, the ore is hard, and the phosphate rock layer is produced. Dolomite shale in the rock series. The two main mineral layers of industrial value are the upper three ore layers and the lower one of the ore layers, which are 80 m apart. Three seam roof and floor of the outer sheet interbedded phosphate rock; roof one phosphorus-containing mineral dolomite, dolomite plate containing manganese and phosphorus-containing shale.
The ore structure is simple to make, but the mineral inlay characteristics are more complicated. The minerals are cryptocrystalline microcrystalline and colloidal homogeneous bodies, which are dense, braided and pseudo-saclike structures. A dense block, strip, layer or microlayer structure is formed by the colloidal phosphate. The fine-grained carbonate and silicate gangue minerals are mixed in the granules of the phosphite or the granules, and the particle size is generally 0.013~0.05mm; the granules of the phosphite or the granules are fine, generally It is 0.176~0.944mm, which is not scattered in many individuals, and is mainly distributed in a dense body. The content of the phosphorus mineral particles larger than 0.058 mm was 83%, and the content greater than 0.048 mm was 90%. The compacted phosphate rock consists of dense P 2 O 5 with high content and less impurities; the banded and interbedded phosphorite contains P 2 O 5 , depending on the phosphorus band and vein The thickness and proportion of the stone strip. The mineral composition and characteristics of the three ore layers are shown in Table 1.
This type of ore accounts for 70% of the total proven reserves of phosphate rock in the country. The phosphate ore is difficult to select and is the subject of research and development and mineral processing research of phosphate rock resources in China.
(2) Process flow: The process of mineral processing is shown in Figure 1. The particle size composition of the final product of the crushed mine is shown in Table 2. The particle size composition of the grinding products is shown in Table 3. The flotation operation conditions are shown in Table 4. The dewatering conditions are shown in Table 5. The semi-industrial test process indicators are shown in Table 6. The unit consumption indicators are shown in Table 7. The main equipment is shown in Table 8.
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