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Preparation method of improver for phosphogypsum

A technology of phosphogypsum and improver, applied in the field of building materials, can solve the problems of poor effect, low softening coefficient, poor performance, etc., and achieve the effect of wide application, improving softening coefficient and improving performance

Inactive Publication Date: 2021-11-02
SUZHOU XINGBANG CHEM BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The softening coefficient of existing phosphogypsum is low, the performance is not good, and the application effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing a modifier for phosphogypsum is provided, comprising the steps of:

[0018] (1) Use a ball mill to mill the natural gypsum so that the specific surface area of ​​the natural gypsum is milled to 6300m 2 / kg, the 400-mesh sieve balance does not exceed 0.5%;

[0019] (2) Fully soak the ground natural gypsum in succinic acid with a mass fraction of 5% for 24 hours to obtain a mixed aqueous solution of natural gypsum;

[0020] (3) Calcining the natural gypsum mixed aqueous solution by hydrothermal method, the calcination temperature is 600°C, the pressure is 0.5MPa, and the time is 6 hours, to obtain a modified component, which is in powder form;

[0021] (4) Fully mix 700kg of modified components with 80kg of calcium stearate, 120kg of tributyl phosphate, and 100kg of fumed silica to obtain a modifier for phosphogypsum;

[0022] (5) The blending amount of the improver for phosphogypsum is 1% of the mass of the phosphogypsum, and after blending, the ...

Embodiment 2

[0024] A method for preparing a modifier for phosphogypsum is provided, comprising the steps of:

[0025] (1) Use a ball mill to mill the natural gypsum to make the specific surface area of ​​the natural gypsum reach 6000m 2 / kg, the 400-mesh sieve balance does not exceed 0.5%;

[0026] (2) Fully soak the finely ground natural gypsum in succinic acid with a mass fraction of 7% for 23 hours to obtain a mixed aqueous solution of natural gypsum;

[0027] (3) Calcining the natural gypsum mixed aqueous solution by hydrothermal method, the calcination temperature is 550°C, the pressure is 0.6MPa, and the time is 7 hours, to obtain a modified component, which is in powder form;

[0028] (4) Fully mix 650kg of modified components with 100kg of calcium stearate, 100kg of tributyl phosphate, and 130kg of fumed silica to obtain a modifier for phosphogypsum;

[0029] (5) The blending amount of the improver for phosphogypsum is 1.5% of the mass of the phosphogypsum. After blending, the s...

Embodiment 3

[0031] A method for preparing a modifier for phosphogypsum is provided, comprising the steps of:

[0032] (1) Use a ball mill to mill the natural gypsum so that the specific surface area of ​​the natural gypsum can be milled to 6500m 2 / kg, the 400-mesh sieve balance does not exceed 0.5%;

[0033] (2) Fully soak the finely ground natural gypsum in succinic acid with a mass fraction of 4% for 28 hours to obtain a mixed aqueous solution of natural gypsum;

[0034] (3) Calcining the natural gypsum mixed aqueous solution by hydrothermal method, the calcination temperature is 700°C, the pressure is 0.4MPa, and the time is 5 hours, to obtain a modified component, which is in powder form;

[0035] (4) Fully mix 750kg of modified components with 60kg of calcium stearate, 150kg of tributyl phosphate, and 80kg of fumed silica to obtain a modifier for phosphogypsum;

[0036] (5) The blending amount of the improver for phosphogypsum is 0.5% of the mass of the phosphogypsum, and after bl...

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Abstract

The invention discloses a preparation method of an improver for phosphogypsum, which comprises the following steps: carrying out ball milling on natural gypsum, and soaking the ground natural gypsum to obtain a natural gypsum mixed aqueous solution; calcining the natural gypsum mixed aqueous solution by adopting a hydrothermal method to obtain a modified component; and mixing the modified component with calcium stearate, tributyl phosphate and fumed silica to obtain the improver for phosphogypsum. According to the mode, after the modifier is doped into the phosphogypsum, the softening coefficient of the phosphogypsum can be increased and is larger than 0.98, the performance of the phosphogypsum is effectively improved, and wider application of the phosphogypsum can be achieved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of a modifier for phosphogypsum. Background technique [0002] Phosphogypsum refers to the solid waste generated when sulfuric acid is used to treat phosphate rock in the production of phosphoric acid, and its main component is calcium sulfate. The main component of phosphogypsum is CaSO 4 2H 2 O, in addition to containing a variety of other impurities. Phosphogypsum is generally in powder form, and its appearance is generally grayish white, grayish yellow, light green and other colors, and it also contains organic phosphorus, sulfur and fluorine compounds. Building phosphogypsum and its products, which are mainly composed of β-hemihydrate gypsum, obtained by dehydration of phosphogypsum are an effective way of resource utilization, and at the same time can achieve the purpose of consuming a large amount of phosphogypsum waste residue. The exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B11/024
CPCC04B11/26C04B11/024
Inventor 沈焱钱佳佳时磊郑媛媛
Owner SUZHOU XINGBANG CHEM BUILDING MATERIALS
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