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Technology for producing calcium superphosphate from titanium dioxide production byproduct waste acid

A technology of titanium dioxide and superphosphate, applied in the chemical industry, can solve the problems of waste of resources, high environmental protection cost, waste of calcium resources, etc., and achieve the effect of reducing the cost of concentration, avoiding the cost of pollution and treatment, and reducing the cost of treatment.

Pending Publication Date: 2019-12-17
贵州胜威福全化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low concentration of 20%-25% waste acid and containing a large amount of ferrous sulfate, traditional sulfuric acid titanium dioxide production enterprises can only desulfurize and neutralize it, which not only causes a large amount of sulfur, iron, and calcium resources. waste, and a large amount of desulfurized gypsum stockpiles are generated, and the cost of environmental protection treatment is high
[0003] As mentioned above, the current production of sulfuric acid titanium dioxide has the disadvantages of waste of valuable resources, a large amount of desulfurization gypsum stockpiling and high cost of environmental protection treatment.

Method used

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  • Technology for producing calcium superphosphate from titanium dioxide production byproduct waste acid
  • Technology for producing calcium superphosphate from titanium dioxide production byproduct waste acid
  • Technology for producing calcium superphosphate from titanium dioxide production byproduct waste acid

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1, a kind of technique that utilizes titanium dioxide by-product waste acid to produce superphosphate, the concrete steps of this technique are as follows:

[0041] (1) Heat exchange the by-product waste acid in the production of titanium dioxide with the tail gas of the calcination rotary kiln in the empty tower, concentrate the waste acid to 28%, and then send it to a plate and frame filter press for coarse filtration to remove impurities to obtain clarified acid. The tail gas is sent to the tail gas treatment system for treatment and discharged up to standard;

[0042] (2) The clarified acid after coarse filtration is sent to the acid preparation section and mixed with 98% concentrated sulfuric acid in the acid preparation tank to increase the acid concentration to 65% to obtain concentrated acid;

[0043] (3) Cool the concentrated acid to <50°C through a graphite heat exchanger, then pump it to a plate and frame filter press for fine filtration, remove th...

Embodiment 2

[0045] Embodiment 2, a kind of technique that utilizes titanium dioxide by-product waste acid to produce superphosphate, the concrete steps of this technique are as follows:

[0046] (1) Heat exchange the by-product waste acid in the production of titanium dioxide with the tail gas of the calcination rotary kiln in the empty tower, concentrate the waste acid to 26%, and then send it to a plate and frame filter press for coarse filtration to remove impurities to obtain clarified acid. The tail gas is sent to the tail gas treatment system for treatment and discharged up to standard;

[0047] (2) The clarified acid after coarse filtration is sent to the acid preparation section and mixed with 97% concentrated sulfuric acid in the acid preparation tank to increase the acid concentration to 65% to obtain concentrated acid;

[0048] (3) Cool the concentrated acid to <50°C through a graphite heat exchanger, then pump it to a plate and frame filter press for fine filtration, remove th...

Embodiment 3

[0050] Embodiment 3, a kind of technique that utilizes titanium dioxide byproduct waste acid to produce superphosphate, the concrete steps of this technique are as follows:

[0051] (1) Heat exchange the by-product waste acid in the production of titanium dioxide with the tail gas of the calcination rotary kiln in the empty tower, concentrate the waste acid to 30%, and then send it to a plate and frame filter press for coarse filtration to remove impurities to obtain clarified acid. The tail gas is sent to the tail gas treatment system for treatment and discharged up to standard;

[0052] (2) The clarified acid after the coarse filtration is sent to the acid preparation section and mixed with 99% concentrated sulfuric acid in the acid preparation tank to increase the acid concentration to 67% to obtain concentrated acid;

[0053] (3) Cool the concentrated acid to <50°C through a graphite heat exchanger, then pump it to a plate and frame filter press for fine filtration, remove...

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Abstract

The invention discloses a technology for producing calcium superphosphate from a titanium dioxide production byproduct waste acid. The technology comprises the following steps: (1) carrying out heat exchange on the titanium dioxide production byproduct waste acid and calcining rotary kiln tail gas to obtain concentrated waste acid, and carrying out coarse filtration on the concentrated waste acidto obtain a clarified acid; (2) blending the clarified acid with concentrated sulfuric acid to obtain a concentrated acid; (3) cooling the concentrated acid, and then carrying out fine filtration to obtain a ferrous iron-removed acid; and (4) reacting the ferrous iron-removed acid with ground phosphate rock in a reactor, overflowing the obtained solution to a rotary converter, performing a reaction, and performing curing after the reaction to obtain the calcium superphosphate. The technology has the advantages of low treatment cost, high conversion rate of the phosphate rock, generation of great economic benefits, and no generation of desulfurized gypsum.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a process for producing superphosphate by using waste acid produced by titanium dioxide. Background technique [0002] At present, the industrial production methods of nano-titanium dioxide in the world mainly include sulfuric acid decomposition of titanium raw materials and chlorine gas decomposition of titanium raw materials. During the production process of sulfuric acid decomposition of titanium raw materials, 20%-25% of waste sulfuric acid, generally called waste acid, will be produced by-product; 3-5% of acidic wastewater will also be produced by-product. Due to the low concentration of 20%-25% waste acid and containing a large amount of ferrous sulfate, traditional sulfuric acid titanium dioxide production enterprises can only desulfurize and neutralize it, which not only causes a large amount of sulfur, iron, and calcium resources. Waste, and a large amount of desulfuriz...

Claims

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Application Information

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IPC IPC(8): C01B25/32
CPCC01B25/325C01P2006/80
Inventor 周桂民张邦琪陆廷雷赵磊邓主全
Owner 贵州胜威福全化工有限公司
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