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Phosphogypsum waste residue treatment method

A treatment method, phosphogypsum technology, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve problems such as less research

Pending Publication Date: 2020-12-22
福泉环保城发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the raw materials for preparing nano-calcium sulfate crystals are mainly prepared from natural gypsum or raw gypsum, and there are few studies on preparing nano-calcium sulfate crystals from phosphogypsum waste residue.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Washing and drying the phosphogypsum waste residue with deionized water, grinding and sieving to obtain pretreated phosphogypsum powder;

[0020] (2) 60ml of glycerin and 25ml of absolute ethanol were mixed and stirred evenly, then 0.35g of dodecyltrimethylammonium bromide was added, and the stirring was continued until the solid was dissolved to obtain solution A;

[0021] (3) Mix and stir 1.5 g of the pretreated phosphogypsum powder and 2 ml of nitric acid solution, then add 2 ml of sulfuric acid solution and continue to stir to prepare solution B, slowly add solution A to solution B dropwise, The dropping rate of solution A is 1.2ml / min, adopt intermittent ultrasonic treatment, the specific process is: ultrasonic 10min under the power of 400W, stop for 1min, repeat the above process, the total ultrasonic time is 1h; the obtained mixture is transferred to the reaction kettle , react at 120° C. for 15 h, cool to room temperature after the reaction, filter the react...

Embodiment 2

[0023] (1) Washing and drying the phosphogypsum waste residue with deionized water, grinding and sieving to obtain pretreated phosphogypsum powder;

[0024] (2) 60ml of glycerin and 35ml of absolute ethanol were mixed and stirred evenly, then 0.55g of dodecyltrimethylammonium bromide was added, and the stirring was continued until the solid was dissolved to obtain solution A;

[0025] (3) 2.5 g of the pretreated phosphogypsum powder prepared above and 2 ml of nitric acid solution were mixed and stirred, and then 2 ml of sulfuric acid solution was added to continue stirring to obtain solution B. In solution B, slowly add solution A prepared above, The dropping speed of solution A is 1.5ml / min, adopt intermittent ultrasonic treatment, the specific process is: ultrasonic 10min under the power of 500W, stop for 1min, repeat the above process, the total ultrasonic time is 3h; the obtained mixture is transferred to the reaction kettle , react at 150° C. for 30 h, cool to room temper...

Embodiment 3

[0027] (1) Washing and drying the phosphogypsum waste residue with deionized water, grinding and sieving to obtain pretreated phosphogypsum powder;

[0028] (2) 60ml of glycerin and 30ml of absolute ethanol were mixed and stirred evenly, then 0.4g of dodecyltrimethylammonium bromide was added, and the stirring was continued until the solid was dissolved to obtain solution A;

[0029] (3) 2g of the above-prepared pretreated phosphogypsum powder and 2ml of nitric acid solution were mixed and stirred, and then 2ml of sulfuric acid solution was added to continue stirring to prepare solution B. In solution B, the above-prepared solution A was slowly added dropwise. The rate of addition of A is 1.2ml / min, using intermittent ultrasonic treatment, the specific process is: ultrasonic 10min under 450W power, stop 1min, repeat the above process, the total ultrasonic time is 2h; the obtained mixture is transferred to the reactor, The reaction was carried out at 130° C. for 20 h, and after...

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Abstract

The invention discloses a phosphogypsum waste residue treatment method, which comprises the following steps: washing phosphogypsum waste residues with deionized water, drying, grinding, and sieving toobtain pretreated phosphogypsum powder; uniformly mixing and stirring glycerol and absolute ethyl alcohol, then adding dodecyl trimethyl ammonium bromide, and continuously stirring until a solid is dissolved to prepare a solution A; mixing and stirring the prepared pretreated phosphogypsum powder and a nitric acid solution, then adding a sulfuric acid solution, continuously stirring to prepare asolution B, slowly dropwise adding the prepared solution A into the solution B, transferring the prepared mixture into a reaction kettle by adopting intermittent ultrasonic treatment, reacting, cooling to room temperature after the reaction is finished, and filtering the reaction solution to obtain a filtrate; and filtering to obtain a solid, and drying the solid to obtain the nano calcium sulfatecrystal. The method is simple to operate, and the prepared nano calcium sulfate crystal is good in stability, has the particle size of 30-50nm and is good in dispersion.

Description

Technical field: [0001] The invention relates to the field of building materials, in particular to a method for treating phosphogypsum waste residue. Background technique: [0002] Phosphogypsum is the waste residue in the phosphoric acid and ammonium phosphate chemical fertilizer industry produced by the wet method of phosphate rock powder. It is acidic and seriously pollutes the environment. It is regarded as the number one chemical waste residue by all countries in the world. Millions of tons of phosphogypsum are produced, only a small part is used as cement retarder and acid co-production cement, and most of them are not fully utilized. The storage of phosphogypsum industrial waste residue not only takes up land but also pollutes the environment. The Outline of the "Eleventh Five-Year Plan" also proposes to do a good job in the comprehensive utilization of resources and promote the utilization of industrial waste such as fly ash, coal gangue, metallurgical and chemical w...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82Y30/00B82Y40/00
CPCC01F11/468C01F11/466B82Y30/00B82Y40/00C01P2004/64C01P2006/80
Inventor 周春松余云丰胡成坤王荔孙坚
Owner 福泉环保城发展有限公司
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