Process for preparing phosphate concentrate as well as byproducts magnesium ammonium sulfate and calcium ammonium nitrate by use of medium and low grade phosphorus ores

A technology of magnesium ammonium sulfate and calcium ammonium nitrate, which is applied in the direction of magnesium sulfate, calcium/strontium/barium nitrate, phosphorus compounds, 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

Active Publication Date: 2015-07-29
贵州盛源新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale flotation plants have been built in Weng'an, Fuquan and other places in my country, but the tailings that are discharged from them need to occupy land and are very difficult to deal with.
At pres...

Method used

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  • Process for preparing phosphate concentrate as well as byproducts magnesium ammonium sulfate and calcium ammonium nitrate by use of medium and low grade phosphorus ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A process for preparing phosphate concentrate by-product ammonium magnesium sulfate and calcium ammonium nitrate from medium and low-grade phosphate rock, the process flow is as follows figure 1 shown, including the following steps:

[0033] (1) Calcining 100g of medium and low-grade phosphate rock at a temperature of 900-1100°C (the factory produces mixed calcination of medium and low-grade phosphate rock and anthracite coal) to obtain calcined slag and carbon dioxide; research shows that low- and medium-grade phosphorus 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:

[0034] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0035] CaCO 3 =CaO+CO 2

[0036] 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;

[0037] (2) Calcined slag is digested with ...

Embodiment 2

[0050] A process for preparing phosphate concentrate by-product ammonium magnesium sulfate and calcium ammonium nitrate from medium and low-grade phosphate rock, the process flow is as follows figure 1 shown, including the following steps:

[0051] (1) Calcining 100g of low- and medium-grade phosphate rock at a temperature of 900-1100°C 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:

[0052] CaCO 3 · MgCO 3 =CaO+MgO+2CO 2

[0053] CaCO 3 =CaO+CO 2

[0054] 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;

[0055] (2) Calcined slag is digested with 100°C water; the use of higher temperature water can accelerate the reaction of CaO and MgO with water:

[0056] CaO+MgO+2H 2 O...

Embodiment 3

[0068] A process for preparing phosphate concentrate by-product ammonium magnesium sulfate and calcium ammonium nitrate from medium and low-grade phosphate rock, the process flow is as follows figure 1 shown, including the following steps:

[0069] (1) Calcining 100g of low- and medium-grade phosphate rock at a temperature of 900-1100°C 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) The calcined slag is digested with water at 80°C; the use of higher temperature water can accelerate the reaction of CaO and MgO with water:

[0074] CaO+MgO+2...

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Abstract

The invention provides a process for preparing phosphate concentrate as well as byproducts of magnesium ammonium sulfate and calcium ammonium nitrate by use of medium and low grade phosphorus ores and belongs to the technical field of inorganic chemical engineering. The process comprises the following steps of calcining, digesting, leaching with ammonium nitrate, then filtering, concentrating and pelletizing a leachate, adding ammonium sulfate into leaching residues for leaching, then filtering, drying filtration residues to obtain the phosphate concentrate, and concentrating a filtration solution to obtain the magnesium ammonium sulfate. According to the process, phosphorus element can be preserved in the prepared phosphate concentrate to the greatest extent; furthermore, the byproducts of the magnesium ammonium sulfate and the calcium ammonium nitrate can be produced at the same time, so that calcium, magnesium and phosphorus elements in the medium and low grade phosphorus ores are fully utilized.

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 ammonium magnesium sulfate and calcium ammonium nitrate 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, with many low-grade ores, 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 cur...

Claims

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Application Information

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IPC IPC(8): C01B25/455C01F5/40C01F11/42
Inventor 张钦顾春光卢玉莲韩瑜张澜曦张仁秀
Owner 贵州盛源新材料股份有限公司
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