Method for removing magnesium from phosphate ore

A phosphate rock and magnesium removal technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of calcium and magnesium removal, achieve the effects of content reduction, simple process flow, and large production capacity

Inactive Publication Date: 2013-05-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the long run, this technology is expected to be used as a pre-selection operation to pre-exclude most of the gangue from low-grade phosphate rock,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Will P 2 o 5 A low-grade silicon-calcium phosphate rock raw ore in Haikou, Yunnan Province with a grade of 15.36% and a MgO content of 5.1% was ground to -0.074mm, which accounted for 70% of the mass, so that the constituent mineral monomers were dissociated. Add 5kg of polyvinyl alcohol (PVA) aqueous solution (degree of alcoholysis 60%, degree of polymerization 50) to the stone ore, stir evenly, then add sulfuric acid solution with a mass concentration of 25% until the pH value is 3, and then mix the The slurry enters the jig system for conventional roughing process, calcite and dolomite are discharged with the upper overflow of the jig as tailings, and phosphate rock is discharged through the underflow to become demagnesified phosphate concentrate. Phosphate Concentrate P 2 o 5 content of 26.2%, MgO content of 0.76%, P 2 o 5 The recovery rate reached 87%, and the removal rate of MgO reached 89%.

Embodiment 2

[0017] Will P 2 o 5 A silicon-calcium phosphate rock raw ore in Wengfu, Guizhou with a grade of 25.7% and a MgO content of 11.4% was ground to -0.074mm, accounting for 80% of the mass, so that the constituent mineral monomers were dissociated. Add 10kg of polyvinyl alcohol (PVA) aqueous solution (alcoholysis degree 70%, polymerization degree 200) to the ore, stir evenly, then add hydrochloric acid solution with a mass concentration of 15% until the pH value is 4, and then mix the ore slurry Entering the jig machine system for a conventional primary roughing and primary beneficiation process, calcite and dolomite are discharged with the upper overflow of the jig as tailings, while phosphate rock is discharged through the underflow to become demagnesified phosphorus concentrate. Phosphate Concentrate P 2 o 5 The content is 30.3%, and the MgO content is 0.67%.

Embodiment 3

[0019] Will P 2 o 5 A low-grade calcareous phosphate rock raw ore in Yichang, Hubei Province with a grade of 6.9% and a MgO content of 15.4% was ground to -0.074mm, which accounted for 60% of the mass, so that the constituent mineral monomers were dissociated. Add 15kg of polyvinyl alcohol (PVA) aqueous solution (alcoholysis degree 80%, polymerization degree 1000) to the ore, stir evenly, then add nitric acid solution with a mass concentration of 20% until the pH value is 4, and then mix the ore slurry Entering the jig system for conventional roughing, beneficiation and scavenging combination process, calcite and dolomite are discharged with the upper overflow of the jig as tailings, while phosphate rock is discharged through the underflow to become demagnesified phosphorus concentrate mine. Phosphate Concentrate P 2 o 5 The content is 21.3%, and the MgO content is 0.97%.

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Abstract

The invention provides a method for removing magnesium from phosphate ore. The method comprises the following steps: grinding raw phosphate ore until particles in the particle size of -0.074mm account for 60 to 80 mass percent to make monomers forming the ore separated; adding 1 to 20kg of aqueous solution of polyvinyl alcohol into each ton of raw phosphate ore, uniformly stirring, and adding an acid solution until the pH value is 3-5; and stirring, reselecting ore pulp, discharging calcite and dolomite as tailings in an overflow way, and discharging the phosphate ore as magnesium-removed phosphate concentrate in a bottom current way. A separation process is simple in flow; and compared with the traditional flotation and reverse flotation, the separation process has the characteristics of high separation accuracy, good separation index, high production capacity and the like, and the content of magnesium oxide in the phosphate concentrate can be effectively reduced.

Description

technical field [0001] The invention relates to a phosphate ore beneficiation process, in particular to a method for removing magnesium from middle and low-grade sedimentary collophosite, and belongs to the technical field of mineral processing. Background technique [0002] There are few rich phosphate rocks and many lean phosphate rocks in my country. Most of the phosphate rocks must be enriched through ore dressing to meet the production requirements of phosphoric acid and high-concentration phosphate fertilizer. [0003] Among the proven phosphate rock reserves, sedimentary phosphate rock (collophoste) reserves account for 85%, and most of them are medium and low-grade ores. The content of harmful impurities is generally high. These ores generally contain calcite and dolomite. Stone, when the two are together, the degree of beneficiation is more difficult. Because of calcite (CaCO 3 ), dolomite (Ca, MgCO 3 ) with apatite (Ca 5 F(PO 4 ) 3 ) both contain the homonymo...

Claims

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Application Information

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IPC IPC(8): B03B5/10B03B1/00
Inventor 邓荣东刘全军常富强胡婷叶峰宏
Owner KUNMING UNIV OF SCI & TECH
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