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Method for demagging from phosphate ore

A technology of phosphate ore and phosphate concentrate, applied in solid separation, flotation, etc., can solve the problems affecting the economic benefits of wet-process phosphoric acid and phosphate compound fertilizer, high production cost of phosphate ore concentrate products, complicated operation control, etc., to achieve The effect of low dosage of chemicals, high flotation efficiency and simple equipment structure

Active Publication Date: 2007-10-10
YUNNAN CHEM RES INST
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Problems solved by technology

[0003] At present, magnesium removal from phosphate rock mainly adopts the reverse flotation process of conventional mechanical agitation flotation machine. Although the process technology is mature, it has the disadvantages of long process, complicated operation control, large installed capacity, high operating cost, and large occupied area, which lead to The production cost of phosphate ore concentrate is high, which affects the economic benefits of downstream products such as wet-process phosphoric acid and phosphorus compound fertilizer

Method used

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  • Method for demagging from phosphate ore
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Embodiment 1

[0025] Mining sample from a mining area in Yunnan, raw ore P 2 o 5 The grade is 26.83%, and the MgO content is 3.91%. A flotation column is used, and the technological process is reverse flotation (see Figure 1). The grinding fineness is -200 mesh 94%, the grinding concentration is 34%, the flotation temperature is about 20°C, 4.0kg / t of mixed acid and 2.5kg / t of fatty acid collector are added, and the phosphorus concentrate after reverse flotation is P 2 o 5 Grade 30.41%, MgO content 1.37%, P 2 o 5 The recovery rate reached 90.04%, and the MgO removal rate reached 72.17%.

Embodiment 2

[0027] Mine sample is the same as embodiment 1, namely raw ore P 2 o 5 The grade is 26.83%, and the MgO content is 3.91%. A flotation column is used, and the technological process is reverse flotation (see Figure 1). The grinding fineness is -200 mesh 94%, the grinding concentration is 34%, the flotation temperature is about 20°C, 4.0kg / t of mixed acid and 2.5kg / t of fatty acid collector are added, and the phosphorus concentrate after reverse flotation is P 2 o 5 Grade 31.02%, MgO content 1.18%, P 2 o 5 The recovery rate reaches 94.80%, and the MgO removal rate reaches 76.25%.

Embodiment 3

[0029] Mine sample is the same as embodiment 1, namely raw ore P 2 o 5 The grade is 26.83%, and the MgO content is 3.91%. Two flotation columns are used. The process flow is a rough and a fine process (see Figure 2). The grinding fineness is -200 mesh 94%, the grinding concentration is 34%, the flotation temperature is about 20°C, adding mixed acid 4.0kg / t, collector 2.5kg / t; the parameters of the second stage flotation column are, adding mixed acid 0.5kg / t, fatty acid collector 0.3kg / t, phosphorus concentrate P after reverse flotation 2 o 5 Grade 32.84%, MgO content 0.78%, P 2 o 5 The recovery rate reached 90.69%, and the MgO removal rate reached 85.22%.

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Abstract

A process for removing Mg from phosphorus ore in order to prepare phosphoric acid by wet method features use of static microbubble floatation column, and includes such steps as breaking the crude phosphorus ore, grinding, classifying, mineralizing by mixing the reverse floatation chemical with ore sludge, and floatating in said static microbubble floatation column while conditioning the ore sludge to obtain the bubble-phase tailings and low-Mg phosphorus ore concentrate from the column bottom.

Description

technical field [0001] The present invention relates to a method for removing impurities from phosphate rock, more specifically, a new method for removing magnesium impurities from phosphate rock. Background technique [0002] In the production process of wet-process phosphoric acid, magnesium impurities in phosphate rock not only affect the production of wet-process phosphoric acid, but also have a significant impact on the deep processing of phosphoric acid and product quality indicators. my country's wet-process phosphoric acid production has reached 5 million tons (P 2 o 5 ) production capacity, and the solution to the technical problems of magnesium removal from phosphate rocks are related to the development of my country's high-concentration phosphate compound fertilizer industry and even the entire chemical fertilizer industry. Stone removal of impurities includes two parts: phosphate rock concentration and enrichment, and phosphate rock im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02B03D1/002B03D1/004B03B1/00B03D101/06B03D101/02B03D103/04
Inventor 刘江林曾波熊明金
Owner YUNNAN CHEM RES INST
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