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A special grinding aid for phosphogypsum cement and its preparation method

A grinding aid and phosphogypsum technology, applied in the field of cement admixture, can solve the problems of cement setting time delay, cement strength reduction, etc., and achieve the effect of increasing the hydration reaction speed, increasing the strength in the later stage, and being easy to use

Active Publication Date: 2021-07-13
SHANDONG HONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems that the setting time of cement is delayed and the strength of cement is reduced after the use of phosphogypsum. The inventor provides a special grinding aid for phosphogypsum cement, through which calcium silicate hydrate absorbs and solidifies impurities in phosphogypsum. At the same time, through the grinding aid of the grinding aid components, the gradation of cement particles can be improved, the physical strength of cement can be improved, and many problems in the application of phosphogypsum in the cement industry can be solved.

Method used

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  • A special grinding aid for phosphogypsum cement and its preparation method

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Embodiment 1

[0028] A special grinding aid for phosphogypsum cement, which is prepared from the following raw materials in parts by weight: 10 parts of alcohol amine grinding aid components, 40 parts of calcium silicate hydrate seed crystals, 0.5 parts of thickening and dispersing agent, defoaming 0.1 part of agent, 20 parts of water; described calcium silicate hydrate crystal seed is made through the following steps:

[0029] (1) Configure A solution: weigh 5 parts of Ca(NO 3 ) 2 4H 2 O was dissolved in 10 parts of deionized water, stirred and dissolved to make A solution;

[0030] (2) Configuration B solution: weigh 4 parts of Na 2 SiO 3 9H 2 O was dissolved in 8 parts of deionized water and stirred to make solution B;

[0031] (3) Add 0.5 parts of polyvinyl alcohol and 20 parts of deionized water into the high-speed stirring tank, stir to dissolve, control the temperature at 20 ° C, and add solution A and B solution to the stirring tank at the same time, keep the constant temperat...

Embodiment 2

[0045] A special grinding aid for phosphogypsum cement, which is prepared from the following raw materials in parts by weight: 20 parts of alcohol amine grinding aid components, 50 parts of calcium silicate hydrate seed crystals, 0.5 parts of thickening dispersant, defoaming agent 0.1 part of agent, 30 parts of water; described calcium silicate hydrate crystal seed is made through the following steps:

[0046] (1) Configure A solution: weigh 8 parts of Ca(NO 3 ) 2 4H 2 O was dissolved in 12 parts of deionized water, stirred and dissolved to make A solution;

[0047] (2) Configuration B solution: weigh 5 parts of Na 2 SiO 3 9H 2 O was dissolved in 10 parts of deionized water and stirred to make solution B;

[0048] (3) Add 0.8 parts of polyvinyl alcohol and 25 parts of deionized water into the high-speed stirring tank, stir to dissolve, control the temperature at 20 ° C, and add solution A and B solution to the stirring tank at the same time, keep the constant temperature...

Embodiment 3

[0062] A special grinding aid for phosphogypsum cement, prepared from the following raw materials in parts by weight: 30 parts of alcohol amine grinding aid components, 70 parts of calcium silicate hydrate seed crystals, 2 parts of thickening and dispersing agent, defoaming agent 0.5 part of agent, 40 parts of water; Described calcium silicate hydrate crystal seed is made through the following steps:

[0063] (1) Configure A solution: weigh 10 parts of Ca(NO 3 ) 2 4H 2 O was dissolved in 15 parts of deionized water, stirred and dissolved to make A solution;

[0064] (2) Configuration B solution: weigh 6 parts of Na 2 SiO 3 9H 2 O was dissolved in 12 parts of deionized water, stirred to make B solution;

[0065] (3) Add 1 part of polyvinyl alcohol and 30 parts of deionized water into the high-speed stirred tank, stir to dissolve, control the temperature at 20 ° C, and add solution A and B to the stirred tank at the same time, keep the constant temperature at 20 ° C, stir ...

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Abstract

The invention discloses a special grinding aid for phosphogypsum cement and a preparation method thereof, belonging to the technical field of cement admixtures. The grinding aid of the present invention is prepared from the following raw materials in parts by weight: 10-30 parts of alcohol amine grinding aid components, 40-70 parts of calcium silicate hydrate seed crystals, 0.5-2 parts of thickening dispersant, Foam agent 0.1-0.5 part, water 20-40 part. The present invention uses the prepared hydrated calcium silicate crystal seed as a substance to induce cement hydration, shortens the induction period in the cement hydration process, and improves the hydration reaction speed; at the same time, it can also adsorb water-soluble phosphorus-containing compounds in phosphogypsum, thereby Accelerate cement hydration and reduce the impact of phosphorus-containing impurities in phosphogypsum on cement hydration. The invention also introduces alcohol amine grinding aid components, and the synergistic effect of each substance can alleviate the problems such as the later strength reduction caused by the phosphogypsum impurities to a certain extent. The product provided by the invention is in the form of liquid, and has many advantages such as simple use and convenient transportation.

Description

technical field [0001] The invention belongs to the technical field of cement admixtures, and in particular relates to a special grinding aid for phosphogypsum cement and a preparation method thereof. Background technique [0002] Phosphogypsum is a by-product of the wet-process phosphoric acid production process, and its main component is CaSO 4 2H 2 O and some other impurities. Generally, every 1t of wet-process phosphoric acid produced (in P 2 o 5 Total) 4~4.5t of phosphogypsum will be produced by-product. At present, the vast majority of phosphogypsum has not been comprehensively utilized, but is disposed of by discarding and stacking, which not only occupies land, pollutes the environment, but also wastes reusable resources. Considering the total amount of consumption and the impact on the environment, the preparation of building materials from phosphogypsum is one of the most suitable ways of utilization. Cement is currently the largest and most widely used bulk b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/52
CPCC04B40/0039C04B2103/52C04B24/122C04B22/00C04B2103/408C04B2103/44C04B2103/50
Inventor 李耀司宏振秦尤敏董芹玺宋南京冯恩娟张辉
Owner SHANDONG HONGYI TECH
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