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Method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum and mortar

A technology of wet-mixed mortar and phosphogypsum, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of mortar cracking, easy damage of particles, incomplete wrapping, etc., to avoid negative effects, slow down The effect of reducing pollution pressure and avoiding expansion

Active Publication Date: 2022-07-22
GUIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the above-mentioned technology is that the encapsulation is not complete, water will penetrate into the aggregate to dissolve sulfate and calcium ions during use, and in the process of production and mixing, the particles are easily damaged, and the exposed phosphogypsum directly reacts with cement to form calcium Alumite, which leads to the expansion of newly formed ettringite after encountering water in the later stage, resulting in problems such as cracking and hollowing of the mortar; at the same time, there are also problems such as high energy consumption and complicated process in the preparation process

Method used

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  • Method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum and mortar
  • Method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum and mortar
  • Method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum and mortar

Examples

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Effect test

Embodiment 1

[0033] The method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum, the steps are as follows:

[0034] The first step: take phosphogypsum with a moisture content of less than 5%, add 9% lime, 7% stone powder and 5.5% phosphoric acid solution of the mass of phosphogypsum, stir and neutralize, and age for 2 days to obtain product A;

[0035] The second step: take water, add cationic starch of 4% of the water mass, stir and mix evenly, heat to 90 ° C, stop heating after gelatinization for 2 hours, and place it to cool to obtain product B;

[0036] The third step: take product A, first add 12% of the mass of product A, product B, mix and stir evenly, bake at 50°C for 30 minutes, and then add 13% of product B of product A for the second mixing and stirring, After stirring evenly, bake again at 50°C for 30min to obtain C product;

[0037] Step 4: Spray C product with 0.5% sodium methyl silicate water repellent of the quality of C product during...

Embodiment 2

[0039] The method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum, the steps are as follows:

[0040] The first step: take phosphogypsum with a moisture content of less than 5%, add 8% lime, 6% stone powder and 5% phosphoric acid solution of the mass of phosphogypsum, stir and neutralize, and age for 1 day to obtain product A;

[0041] The second step: take water, add 2% cationic starch of the water mass, stir and mix evenly, heat to 80 ° C, stop heating after gelatinization for 3 hours, and place it to cool to obtain product B;

[0042]Step 3: Take product A, first add 10% of the mass of product A and product B, mix and stir evenly, bake at 40°C for 40 minutes, and then add 10% of the mass of product A to product B for the second mixing and stirring, After stirring evenly, bake again at 40°C for 40min to obtain C product;

[0043] The fourth step: spray the C product with 0.1% sodium methyl silicate waterproofing agent of the quality of...

Embodiment 3

[0045] The method for preparing cement-based wet-mixed mortar aggregate by modification of phosphogypsum, the steps are as follows:

[0046] The first step: take phosphogypsum with a moisture content of less than 5%, add 8.5% lime, 6.5% stone powder and 5.3% phosphoric acid solution of the mass of phosphogypsum, stir and neutralize, and age for 1 day to obtain product A;

[0047] The second step: take water, add 6% cationic starch of the water mass, stir and mix evenly, heat to 100 ° C, stop heating after gelatinization for 2 hours, and place it to cool to obtain product B;

[0048] Step 3: Take product A, first add 15% of the mass of product A and product B, mix and stir evenly, bake at 60°C for 20 minutes, then add 15% of product B by the mass of product A for the second mixing and stirring, After stirring evenly, bake again at 60°C for 20min to obtain C product;

[0049] The fourth step: spray the C product with 0.8% potassium methyl silicate waterproofing agent in the pro...

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Abstract

The invention discloses a method and mortar for preparing cement-based wet-mixed mortar aggregates by modifying phosphogypsum. The phosphogypsum is used as a raw material, and after aging treatment, it is sequentially coated with cationic starch and methyl silicate waterproofing agent. Thereby, the modified phosphogypsum aggregate for cement-based wet-mix mortar is obtained. The modified phosphogypsum aggregate of the present invention has the characteristics of not reacting with surrounding cement, and will not cause expansion, cracking and hollowing of cement-based building materials, and can be widely used in cement-based building materials; in addition, it has the advantages of energy consumption. Low cost and simple preparation process.

Description

technical field [0001] The invention relates to a method and mortar for preparing mortar aggregates by modification of phosphogypsum, in particular to a method and mortar for preparing cement-based wet-mixed mortar aggregates by modification of original phosphogypsum. Background technique [0002] Phosphogypsum is a solid waste discharged during the production of wet phosphoric acid. Long-term stacking will cause serious pollution to the surrounding environment. Therefore, the utilization of phosphogypsum resources has always been a hot and difficult research topic. [0003] At present, there are two main application methods of phosphogypsum in mortar. One is to use phosphogypsum as a retarder for cement-based mortar. The sulfate ion dissolved from phosphogypsum reacts with tricalcium aluminate in cement to form calcium. Alumite, thereby hindering the hydration of cement to retard setting. However, the dosage of phosphogypsum in this technology cannot be higher than 3-5%, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/12C04B18/04C04B28/00
CPCC04B20/12C04B18/0445C04B28/00C04B14/06C04B24/383C04B2103/0057C04B24/06C04B20/107C04B20/1048C04B20/1051Y02W30/91
Inventor 陈鸿杨林王宏杰曹建新王宪亮桂彬范勇张粤
Owner GUIZHOU UNIV
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