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Process for preparing phosphate concentrate and by-products calcium carbonate and magnesium oxide from mid and low-grade phosphate rocks

A low-grade, phosphorus concentrate technology, applied in the direction of magnesium oxide, calcium carbonate/strontium/barium, phosphate material treatment, etc., can solve the problems of land occupation and processing difficulties, and achieve the reduction of magnesium content, improvement of purity, and good economy benefit effect

Inactive Publication Date: 2015-09-02
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Weng'an, Fuquan and other places in my country have built large-scale flotation plants, but the tailings discharged from them need to occupy land and are very difficult to deal with.
At present, there is no report on the method of using ammonium nitrate to pretreat medium and low-grade phosphate rock to produce phosphorus concentrate, calcium carbonate and magnesium oxide.

Method used

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  • Process for preparing phosphate concentrate and by-products calcium carbonate and magnesium oxide from mid and low-grade phosphate rocks
  • Process for preparing phosphate concentrate and by-products calcium carbonate and magnesium oxide from mid and low-grade phosphate rocks
  • Process for preparing phosphate concentrate and by-products calcium carbonate and magnesium oxide from mid and low-grade phosphate rocks

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] A process for preparing phosphate concentrate by-product calcium carbonate and magnesium oxide from medium and low-grade phosphate rock, the process flow chart is as follows figure 1 shown, including the following steps:

[0043] (1) Calcining 100g of low- and medium-grade phosphate rock at 900-1100°C for 1 hour (the factory calcination process is to mix low- and medium-grade phosphate rock with anthracite for calcination) to obtain calcined slag and carbon dioxide; Dolomite (CaCO 3 · MgCO 3 ), calcite (CaCO 3 ) and fluorapatite (Ca 5 F(PO 4 ) 3 ), where dolomite and calcite begin to decompose at high temperatures above 750°C, as follows:

[0044] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0045] CaCO 3 =CaO+CO 2

[0046] At the same time, fluoroapatite (Ca 5 F(PO 4 ) 3 ) has a decomposition temperature of 1650°C and will not decompose in the range of 900-1100°C;

[0047] (2) Digest the calcined slag with water at 60°C; using higher temperature water can accelerate...

Embodiment 2

[0070] A process for preparing phosphate concentrate by-products calcium carbonate and magnesium oxide from medium and low-grade phosphate rock, the process flow chart is as follows figure 1 shown, including the following steps:

[0071] (1) Calcining 100g of low- and medium-grade phosphate rock at 900-1100°C for 2 hours to obtain calcined slag and carbon dioxide; studies have shown that dolomite (CaCO 3 · MgCO 3 ), calcite (CaCO 3 ) and fluorapatite (Ca 5 F(PO 4 ) 3 ), where dolomite and calcite begin to decompose at high temperatures above 750°C, as follows:

[0072] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0073] CaCO 3 =CaO+CO 2

[0074] At the same time, fluoroapatite (Ca 5 F(PO 4 ) 3 ) has a decomposition temperature of 1650°C and will not decompose in the range of 900-1100°C;

[0075] (2) Digest the calcined slag with water at 100°C; using higher temperature water can accelerate the reaction of CaO and MgO with water to form calcium hydroxide and magnesium hydro...

Embodiment 3

[0089] A process for preparing phosphate concentrate by-products calcium carbonate and magnesium oxide from medium and low-grade phosphate rock, the process flow chart is as follows figure 1 shown, including the following steps:

[0090](1) Calcining 100g of low- and medium-grade phosphate rock at 900-1100°C for 1.5 hours to obtain calcined slag and carbon dioxide; studies have shown that dolomite (CaCO 3 · MgCO 3 ), calcite (CaCO 3 ) and fluorapatite (Ca 5 F(PO 4 ) 3 ), where dolomite and calcite begin to decompose at high temperatures above 750°C, as follows:

[0091] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0092] CaCO 3 =CaO+CO 2

[0093] At the same time, fluoroapatite (Ca 5 F(PO 4 ) 3 ) has a decomposition temperature of 1650°C and will not decompose in the range of 900-1100°C;

[0094] (2) Digest the calcined slag with water at 80°C; the use of higher temperature water can accelerate the reaction of CaO and MgO with water to form calcium hydroxide and magnesium ...

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PUM

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Abstract

The invention provides a process for preparing phosphate concentrate and by-products calcium carbonate and magnesium oxide from mid and low-grade phosphate rocks, and belongs to the technical field of inorganic chemical industry. The process comprises the following steps: burning mid and low-grade phosphate rocks at 900-1100 DEG C; and then carrying out a series of treatment including digesting, leaching and participating to obtain phosphate concentrate, calcium carbonate and magnesium oxide. By virtue of the process, the phosphorus element is reserved in the prepared phosphate concentrate to the maximal extent; meanwhile, the by-products calcium carbonate and magnesium oxide are generated; calcium elements, magnesium elements and phosphorus elements in the mid and low-grade phosphate rocks are fully utilized; and meanwhile, ammonium nitrate and ammonium sulfate are recycled in the treatment process, so that the target of saving raw materials is reached.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a process for preparing phosphate concentrate by-product calcium carbonate and magnesium oxide from medium and low-grade phosphate rock. Background technique [0002] my country's phosphate rock reserves rank second in the world, but compared with other countries in the world, there is a large gap in ore quality, selectivity, and phosphate rock mining. The basic reserves of phosphate rock that can be processed and utilized are relatively large. Low, only 4.054 billion tons, low-grade ore and more, of which P 2 o 5 The rich ore with a mass fraction greater than 30% is only 1.108 billion tons, and China's phosphate rock P 2 o 5 The average mass fraction is about 17%. Most of the phosphate rock must be enriched to meet the production requirements of phosphoric acid and high-concentration phosphate fertilizer. According to the current mining speed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01F11/18C01F5/06
CPCC01B25/01C01F5/02C01F11/18C01P2006/80
Inventor 张钦顾春光卢玉莲张澜曦韩瑜张仁秀
Owner GUIZHOU RES INST OF CHEM IND
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