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Method for preparing crystal whisker of calcium sulphate, and phosphonic acid

A technology of calcium sulfate whiskers and phosphoric acid, applied in chemical instruments and methods, calcium/strontium/barium sulfate, crystal growth, etc., can solve the problems of environmental pollution by discharge wastewater, high cost of mineral processing, waste of sulfate radicals, etc. The effect of low anti-corrosion requirements, high decomposition rate and recovery rate of phosphate rock, and high decomposition rate

Inactive Publication Date: 2007-12-26
云南常青树化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the deepening of industrial application and development, high-grade and low-impurity phosphate-rich rocks are gradually decreasing. Generally, methods such as scrubbing and flotation are used to make the P in phosphate rocks 2 o 5 be enriched, but in the beneficiation process P 2 o 5 The yield is generally less than 85%, and the cost of mineral processing is relatively high, and the problem of environmental pollution by wastewater discharged during the mineral processing process must be solved. Therefore, the adaptability of the phosphoric acid plant to phosphate rock is improved, and raw ore (homogenized or heterogeneous) is directly used as raw material The production of phosphoric acid, improving the utilization rate of phosphorus in phosphate rock, and reducing production costs have attracted much attention
[0008] In addition, the discarded phosphogypsum wastes both the calcium element in the phosphate rock and the sulfate radical in the sulfuric acid

Method used

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  • Method for preparing crystal whisker of calcium sulphate, and phosphonic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) take P 2 o 5 120Kg of phosphate rock powder with a content of 18%, add 6Kg of composite additive A, add P 2 o 5 Concentration is 22% phosphoric acid 1440Kg, and keeping slurry temperature is 60 ℃, and reaction time is 3 hours; Wherein: compound additive formaldehyde humic acid (can be used to contain the humic acid sodium humate, potassium humate and magnesium humate Humic acid) and silicon-containing substances such as diatomaceous earth, the ratio is humic acid: diatomaceous earth=1:2;

[0037] 2) Separating the reacted slurry from liquid to solid by means of pressure filtration or vacuum filtration, washing the solid with water to neutrality and then stacking; the filtered clear liquid is sent to the next reaction procedure for use;

[0038] 3) The clear liquid obtained by the above filtration reacts with sulfuric acid with a concentration of 55% under the action of adding composite additive B, and the addition amount of composite additive B is 1.5% of the theo...

Embodiment 2

[0041] 1) take P 2 o 5 120Kg of phosphate rock powder with a content of 25%, add 1Kg of composite additive A, add P 2 o 5 Concentration is 20% phosphoric acid 1320Kg, and keeping slurry temperature is 70 ℃, and reaction time is 2.5 hours. Wherein: composite additive A is composed of humic acid and silicon-containing substance diatomite, and the ratio is humic acid:diatomite=1:5.

[0042] 2) Separating the reacted slurry from liquid to solid by means of pressure filtration or vacuum filtration, washing the solid with water to neutrality and then stacking; the filtered clear liquid is sent to the next reaction procedure for use;

[0043] 3) Filtration gained clear liquid is under the effect of adding composite additive second, and concentration is the sulfuric acid reaction of 35%, and the addition amount of composite additive is 1.0% of the theoretical generation amount of gypsum whisker output; 102%; Phosphoric acid and calcium sulfate whiskers are generated in the reactio...

Embodiment 3

[0046] 1) take P 2 o 5 120Kg of phosphate rock powder with a content of 28%, add 0.6Kg of composite additive A, add P 2 o 5 Concentration is 20% phosphoric acid 1500Kg, and keeping slurry temperature is 80 ℃, and reaction time is 2.5 hours. Wherein: composite additive A is composed of humic acid and diatomaceous earth, and the ratio is humic acid: diatomite=1:10.

[0047] 2) Use pressure filtration or vacuum filtration to separate the liquid from the solid of the reacted slurry, wash the solids until they are neutral, and then pile them up; the filtered clear liquid is sent to the next reaction program for use;

[0048] 3) Filtration gained clear liquid is under the effect of adding compound additive second, is the sulfuric acid reaction of 25% with concentration, and the addition amount of compound additive is 0.5% of the gypsum whisker output theoretical production amount; 102%; Phosphoric acid and calcium sulfate whiskers are generated in the reaction tank, the temperat...

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Abstract

This invention discloses a method for preparing calcium sulfate whiskers and phosphoric acid. The method comprises: phosphate ore decomposition, slurry filtration and separation, calcium sulfate whisker crystallization, separating, washing and drying. The method adds composite additive A during the during phosphate ore decomposition process, and adds composite additive B during calcium sulfate whisker crystallization process to form calcium sulfate whiskers and phosphoric acid. Composite additive A is composed of humic acid and diatomite at a ratio of 1:(2-10). Composite additive B is composed of sodium dodecyl sulfonate and sulfate or phosphate of magnesium and aluminum at a ratio of (2-5):1. The addition amount of composite additive A is 0.5-5.0% of phosphate ore. The addition amount of composite additive B is 0.1-2.0% of theoretical formation amount of calcium sulfate whiskers. The method has such advantages as adequate utilization of raw materials, low solid waste discharge amount, and low production cost.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers and phosphoric acid. Background technique [0002] A whisker refers to a fibrous single crystal with a fixed cross-sectional shape, a complete shape, a perfect internal structure, and an aspect ratio of 5-1000. Gypsum whiskers have excellent properties and are widely used, and can be used in composite material reinforcement, friction materials, environmental engineering, asphalt modification, coatings and paints and other fields. At present, the production methods of gypsum whiskers mainly include hydrostatic heating method and reaction method of sulfuric acid and soluble calcium salt. [0003] In the field of wet-process phosphoric acid production, it is generally known that the mixed acid decomposition of sulfuric acid and phosphoric acid is carried out in two steps: phosphoric acid is decomposed by phosphoric acid to produce calcium dihydrogen phosphate, and calcium dihydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/46C30B29/62C01B25/222C01F11/46
Inventor 陈爱中赵金秀何培李勤
Owner 云南常青树化工有限公司
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