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Technology for preparation of low-magnesium phosphate concentrate and byproducts calcium carbonate and magnesium oxide from medium and low grade phosphate rock

A low-magnesium phosphorus concentrate, low-grade 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, to solve the problem of land occupation and environmental protection Pollution, effect of reducing magnesium content

Active Publication Date: 2016-05-04
贵州盛源新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 chloride or ammonium nitrate to pretreat medium and low-grade phosphate rock to produce low-magnesium phosphorus concentrate, calcium carbonate, and magnesium oxide.

Method used

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  • Technology for preparation of low-magnesium phosphate concentrate and byproducts calcium carbonate and magnesium oxide from medium and low grade phosphate rock
  • Technology for preparation of low-magnesium phosphate concentrate and byproducts calcium carbonate and magnesium oxide from medium and low grade phosphate rock
  • Technology for preparation of low-magnesium phosphate concentrate and byproducts calcium carbonate and magnesium oxide from medium and low grade phosphate rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A process for producing low-magnesium phosphorus 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:

[0042] (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:

[0043] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0044] CaCO 3 =CaO+CO 2

[0045] 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;

[0046] (2) Digest the calcined slag with water at 60°C; using higher temperature water...

Embodiment 2

[0068] A process for producing low-magnesium phosphorus 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:

[0069] (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:

[0070] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0071] CaCO 3 =CaO+CO 2

[0072] 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;

[0073] (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 m...

Embodiment 3

[0085]A process for producing low-magnesium phosphorus 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:

[0086] (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:

[0087] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0088] CaCO 3 =CaO+CO 2

[0089] 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;

[0090] (2) Digest the calcined slag with water at 80°C; using higher temperature water can accelerate the reaction of CaO and MgO with water to form calcium hydroxide and m...

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Abstract

Belonging to the technical field of inorganic chemical industry, the invention provides a technology for preparation of low-magnesium phosphate concentrate and byproducts calcium carbonate and magnesium oxide from medium and low grade phosphate rock. The technology includes the steps of: calcining medium and low grade phosphate rock at 900-1100DEG C; and then carrying out slaking, leaching, precipitation and a series of treatment to obtain low-magnesium phosphate concentrate, calcium carbonate and magnesium oxide. The technology maximumly retains phosphorus element in the prepared low-magnesium phosphate concentrate, and produces calcium carbonate and magnesium oxide as the byproducts, so that the calcium, magnesium and phosphorus elements in the medium and low grade phosphate rock can be fully utilized. In the obtained low-magnesium phosphate concentrate, calcium carbonate and magnesium oxide products, the low-magnesium phosphate concentrate has a phosphorus pentoxide content of more than 37% and a magnesium oxide content of less than 0.5%, the calcium carbonate has a calcium oxide content of more than 50%, and the magnesium oxide has purity of over 94%. Therefore, the increase percentage point of phosphorus pentoxide in the low-magnesium phosphate concentrate is over 10.13.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a process for preparing low-magnesium phosphorus 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01C01F11/18C01F5/02
CPCC01B25/01C01F5/02C01F11/18C01P2006/80
Inventor 张钦顾春光卢玉莲张澜曦韩瑜张仁秀
Owner 贵州盛源新材料股份有限公司
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