Low-grade phosphorite mineral dressing technology and method for producing by-product high-purity gypsum powder

A low-grade, gypsum powder technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of resource utilization and cannot be used efficiently, and achieve the solution of shortage of phosphorus resources, great economic value and social benefits, and achieve high efficiency. The effect of using

Inactive Publication Date: 2012-07-18
张黔生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortage that existing low-grade phosphate rock cannot be efficiently utilized as a resource, the present invention provides a low-grade phosphate rock beneficiation process and a method for by-product high-purity gypsum powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 100 grams of phosphate rock, and the composition of phosphate rock is

[0020] name P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 Al 2 o 3 F SUM Raw ore 16.092 37.772 5.793 24.771 1.25 0.885 1.612 88.675

[0021] Implement by processing step of the present invention:

[0022] A. Crush and ball-mill low-grade phosphate rock with a content of 16-18% to a 40-mesh phosphate rock powder, add water and mix it into a slurry. The liquid-solid ratio of the slurry is controlled at 3:1, and the temperature is controlled at 30-50°C. Add hydrochloric acid with a concentration of 18% to 30%, add 50 to 70 grams of hydrogen chloride per 100 grams of phosphate rock powder, and the reaction time is 20 to 50 minutes;

[0023] B. Add compound defluorinating agent, control to add 8-10 grams of compound defluorinating agent per 100 grams of phosphate rock powder, keep warm at 40°C-50°C, defluorinate and keep warm at rest for 4-6 hours;

[0024] C. ...

Embodiment 2

[0045] Weigh 500 grams of phosphate rock, and the composition of phosphate rock is

[0046] name P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 Al 2 o 3 F SUM Raw ore 16.092 37.772 5.793 24.771 1.25 0.885 1.612 88.675

[0047] Take by weighing 1100 grams of hydrochloric acid (concentration 30.1%), implement according to processing steps A~F of the present invention:

[0048] Reaction time (h) Defluorinating agent (g) Clarification time (h) Amount of sediment in one filtration (g) Washing water (g) Amount of lime milk (g) Calcium dihydrogen phosphate reaction time (h) Amount of calcium dihydrogen phosphate (g) 0.5 15.12 4 182.05 150 (of which 40g is discharged) 5.76 (concentration 10%, converted to pure CaO) 1.5 174.4

[0049] Amount of washing water (g) Amount of lime added (g) Reaction time (h) Magnesium hydroxide (g) Amount of washing water (g) Amount of sulfuric acid added (g) ...

Embodiment 3

[0060] Take by weighing 600 grams of phosphate rock, and the composition of phosphate rock is:

[0061] name P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 al 2 o 3 F SUM Raw ore 16.092 37.772 5.793 24.771 1.25 0.885 1.612 88.675

[0062] Take by weighing 2111 grams of hydrochloric acid (concentration 18.1%), implement according to processing steps A~F of the present invention:

[0063] Reaction time (h) Defluorinating agent (g) Clarification time (h) Amount of sediment in one filtration (g) Washing water (g) Amount of lime milk (g) Calcium dihydrogen phosphate reaction time (h) Amount of calcium dihydrogen phosphate (g) 0.5 18.144 4 218.46 144 (of which 48g is discharged) 34.56 (concentration 10%, converted to pure CaO) 1.5 209.28

[0064] Amount of washing water (g) Amount of lime added (g) Reaction time (h) Magnesium hydroxide (g) Amount of washing water (g) Amount of sulfuric ac...

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Abstract

The invention provides a low-grade phosphorite mineral dressing technology and a method for producing a by-product high-purity gypsum powder. Phosphorite is recycled and processed with hydrochloric acid to produce calcium dihydrogen phosphate and calcium hydrogen phosphate and co-produce high-purity gypsum powder. According to the method, the comprehensive utilization of accompanying elements in phosphorite resources is implemented; except for a main product calcium phosphate, three products of high silica slag, magnesium hydroxide and the high-purity gypsum powder are obtained; the high efficiency utilization of low-grade phosphorite is implemented; the resource value is promoted; the problem of phosphorus resource shortage in China is solved; a powerful support is provided for the sustainable development of phosphorus chemical industry enterprises; the economic benefits of the chemical industry enterprises are greatly improved; and great economic value and social benefits of limited mineral resources are realized.

Description

technical field [0001] The invention relates to a mineral processing technology of phosphate rock, in particular to a low-grade phosphorus rock mineral processing technology and a method for producing high-purity gypsum powder by-product. Background technique [0002] At present, with the development of the national economy, my country's phosphate rock resources are becoming less and less, especially high-grade phosphate rock, while a large amount of low-grade phosphate rock is 16-18%. Due to technical limitations, its economic value lower, discard it. On the one hand, due to the shortage of phosphorus resources, the state restricts exports, resulting in serious excess production capacity of phosphorus compound fertilizers, phosphates, and yellow phosphorus in my country, and low economic benefits for phosphorus chemical enterprises; Contents of the invention [0003] In order to overcome the deficiency that existing low-grade phosphate rock cannot be efficiently utilized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C01F5/22C01F11/46
Inventor 张黔生胡厚美
Owner 张黔生
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