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Method of comprehensive utilization of industrial waste acid and ardealite

A technology for industrial waste acid and phosphogypsum, which is applied in the field of industrial waste acid and phosphogypsum to prepare calcium sulfate whiskers, and the comprehensive utilization of waste acid and solid waste phosphogypsum can solve problems such as environmental pollution, reduce natural gypsum mining, and reduce Production cost, reduction in mining, the same effect as quality

Active Publication Date: 2012-03-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing calcium sulfate whiskers using industrial waste acid and phosphogypsum as raw materials, which can solve the environmental pollution problem caused by the stockpiling of industrial waste acid and phosphogypsum, and can also reduce the mining of natural gypsum ,save resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. According to the solid-liquid ratio of 1:15, 100 g of phosphogypsum was mixed with 1500 mL of industrial waste acid with a volume concentration of 5%, and the pH value of the solution was adjusted to 3.5 with ammonia water, and stirred at 60 ° C for 30 minutes; The mass percentage of the main chemical components is: CaO=39.35, SO 2 =50.86, Fe 2 O 3 =4.83, Al 2 O 3 =2.56, P 2 O 5 =1.87, F=0.21, SiO 2 =0.32;

[0031] b. The solution obtained in step B is filtered immediately, and the filter residue is discarded to obtain a filtrate;

[0032] c. The filtrate obtained in step B was cooled at room temperature for 25min, so that all the crystals were precipitated, and the waste acid was filtered off; the waste acid was returned to step A to continue recycling, and can be reused 3 times;

[0033] D. The surface of the crystal obtained in step C is stabilized by conventional physical methods;

[0034] E. The crystals obtained in step D are dried at 220° C. to a...

Embodiment 2

[0037] A. According to the solid-liquid ratio of 1:0.5, 80 g of phosphogypsum was mixed with 40 mL of industrial waste acid with a volume concentration of 2%, and the pH value of the solution was adjusted to 2 with ammonia water, and stirred at 30 ° C for 40 min; wherein, the raw material phosphogypsum was The mass percentage of the main chemical components is: CaO=44.21, SO 2 =50.03, Fe 2 O 3 =2.24, Al 2 O 3 = 2.25, P 2 O 5=0.78, F=0.12, SiO 2 =0.37;

[0038] B. Immediately filter the solution obtained in step B, discard the filter residue, and obtain the filtrate;

[0039] C. Cool the filtrate obtained in step B at room temperature for 30 minutes to precipitate all the crystals, filter off the spent acid; return the spent acid to step A to continue recycling, and can be reused 5 times;

[0040] D. The surface of the crystal obtained in step C is stabilized by conventional chemical methods;

[0041] E. Dry the crystals obtained in step D at 300°C until the water...

Embodiment 3

[0044] A. According to the solid-liquid ratio of 1:75, mix 60g of phosphogypsum with 4500mL of industrial waste acid with a volume concentration of 10%, adjust the pH value of the solution to 6 with ammonia water, and stir at 80°C for 20min; wherein, the raw material phosphogypsum The mass percentage of the main chemical components is: CaO=46.56, SO 2 =45.27, Fe 2 O 3 =4.24, Al 2 O 3 =0.29,P 2 O 5 =2.13, F=0.2, SiO 2 = 1.31;

[0045] B. Immediately filter the solution obtained in step B, discard the filter residue, and obtain the filtrate;

[0046] C. Cool the filtrate obtained in step B at room temperature for 10 minutes to precipitate all the crystals, filter off the spent acid; return the spent acid to step A to continue recycling, and can be reused 8 times;

[0047] D. The surface of the crystal obtained in step C is stabilized by conventional mechanical methods;

[0048] E. The crystals obtained in step D were dried at 80°C until the water content was 0.28%,...

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Abstract

The invention provides a method for preparing calcium sulfate crystal whisker with industrial waste acid and ardealite, which comprises the following steps: mixing ardealite and industrial waste acid, adjusting pH of the solution with ammonia water, and then stirring; immediately filtering the solution, cooling the filtrate, all crystal being separated out, and performing conventional stabilizing process on the surface of the crystal; and then drying, and obtaining calcium sulfate crystal whisker. The diameter of the obtained calcium sulfate crystal whisker is 1-4mum, the length is 50-200mum, the moh's hardness is 3-4, the tensile strength is 20.5Gpa, the elastic modulus is 178GPa, and the refractive index is 1.585. With the invention, industrial waste acid and solid waste ardealite can be utilized, the waste product of the two kinds of industries can be utilized, so the goal of treatment of wastes with processes of wastes against one another can be achieved; exploitation of natural gypsum can be reduced, resource can be saved, and meanwhile the production cost of calcium sulfate crystal whisker can be reduced; and the limit on the ingredients of the raw material ardealite and industrial waste acid is not strict, the application range is wide, the condition is wide, and the process is simpler.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of waste acid and solid waste residue phosphogypsum, in particular to a method for preparing calcium sulfate whiskers from industrial waste acid and phosphogypsum, and belongs to the technical field of comprehensive utilization of chemical waste. Background technique [0002] Phosphogypsum is an industrial waste residue produced by the reaction between phosphate rock and sulfuric acid in the production process of wet phosphoric acid. It is calculated that every ton of phosphoric acid produced will produce 4 to 5 tons of phosphogypsum. At present, the annual emission of phosphogypsum in the world reaches 200 million. However, the utilization rate of phosphogypsum is less than 10%. The treatment, disposal and comprehensive utilization of phosphogypsum have become a worldwide problem. The production of phosphate fertilizers in my country ranks first in the world. The production of high-concen...

Claims

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Application Information

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IPC IPC(8): C30B7/14C30B29/62C30B29/46
Inventor 马林转王华卿山祝星
Owner KUNMING UNIV OF SCI & TECH
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