Magnesium phosphate removal technology

Yunnan and Sichuan, Yichang, Shennongjia Baokang area and phosphorus mineral deposition type metal phosphate rock, was aphanitic block, false oolite granular aggregates, i.e. phosphate rock, is hard mineral stone.

1. Deposit: It is divided into three metallogenic layers, of which the lower layer is a mineral layer with industrial value. The lower ore layer is divided into three ore layers, namely the upper and lower lean ore layers and the Zhongfu deposit, forming a “poor and rich” ore structure. The upper lean layer (Ph13-3) consists of dolomite strips of phosphorite, with an average grade of 18.01%, which is a carbonate type ore. The middle layer (Ph13-2) consists of dense strips of phosphate rock with an average grade of 32.79%. The lower lean layer (Ph13-1) ore is composed of argillaceous strips of phosphate rock with an average grade of 15.16% and is a silicate type ore. The entire Ph13 deposit is a mixed ore. There are few rich ore in the area, and there are a lot of ore. The chemical composition of the ore in Yichang and Baokang mines is listed below (Table 1).

2. Ore mineral composition and embedding characteristics The main useful component in the ore is colloidal phosphate. The gangue minerals are mainly dolomite, quartz and clay minerals, followed by feldspar , mica and carbonate minerals. The ore mineral particles are fine, and the phosphorus minerals are closely symbiotic with the gangue minerals, which are colloidal or cryptocrystalline and microcrystalline. Collophane microscopic brown, brown or colorless gum-like form, shavings sand, mineral aggregates of oolite, oolite false structure, often mixed with clay minerals, carbonate, silica, iron substance, It is distributed with the gangue to form a so-called "endogenous" gangue. Table 1 Analysis results of chemical composition of ore

project P 2 O 5 CaO MgO CO 2 Loss on ignition Acid insoluble matter R 2 O 3 F SO 4 -2 S SiO 2
Yichang 19.25 39.98 10.85 22.83 22.70 4.50 1.63 0.56 0.70 0.35 /
Baokang 21.80 38.14 4.92 12.41 12.18 / 3.73 1.82 / / 13.32
Carbonate gangue minerals are dolomite, calcite , mostly fine-grained aggregates and vein-like white cloud strips, and some are irregular aggregates scattered in the colloidal phosphate ore aggregates, some of which are substituted for colloidal phosphate ore. And appeared. Dolomite is generally high in content, and its particle size is less than 0.01-value=".6" unitname="mm">0.6 mm, which is semi-self-shaped and self-shaped. Quartz is distributed in mud-silica ore, which is angular and rounded, with a particle size of 0.01-value=".04" unitname="mm">0.04 mm. It can be seen from the above that the phosphorus mineral and the gangue mineral are finely embedded, and from the viewpoint of beneficiation, it is necessary to grind the ore to -200 mesh or finer to dissociate the mineral monomer. Single flotation process technical indicators
product name Yield(%) grade(%) Recovery rate(%) Remarks
Phosphate concentrate 69.75 32.5 92.15 The product contains MgO 0.58% and contains SiO 2 2.08%.

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