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Grinding aid for removing chromium from liquid cement and preparation method of grinding aid

A grinding aid and cement technology, applied in the field of cement grinding, can solve the problems of unusable product hardening, sensitive skin, inconvenient use, etc., to avoid crystallization, ensure the effect of removing chromium, and improve the grinding efficiency.

Active Publication Date: 2019-02-15
SHANDONG HONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is toxic if swallowed / very inhaled, may cause sensitization by skin contact, is more likely to cause genetic defects, and is a persistent hazard to the environment
However, this method provides a solid product, which has disadvantages such as moisture absorption, easy agglomeration, inaccurate measurement, and inconvenient use. In addition, the coating of organic matter may easily cause the product to harden and cannot be used.

Method used

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  • Grinding aid for removing chromium from liquid cement and preparation method of grinding aid
  • Grinding aid for removing chromium from liquid cement and preparation method of grinding aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A liquid cement chromium removal grinding aid is prepared from the following raw materials in parts by weight: 5 parts of grinding aid dispersant, 30 parts of reducing agent, 20 parts of water, and 0.5 part of anti-crystallization agent; the grinding aid dispersant is Diethanol monoisopropanol, purity is 85%; Described reducing agent is sodium thiosulfate; Described anti-crystallization agent is made through the following steps:

[0031] (1) Prepare A solution: weigh 5 parts of acrylic acid, 0.2 parts of thiopropionic acid and 11 parts of deionized water, stir and dissolve to make A solution;

[0032] (2) Prepare B solution: pulverize the diaobai block, weigh 0.3 parts, dissolve in 25 parts of deionized water, stir and dissolve to make B solution;

[0033] (3) Add 40 parts of deionized water into the reaction kettle, then stir and add 70 parts of methallyl polyoxyethylene ether, heat to 30°C, and control it to a constant temperature of 30°C. After all of it is dissolved...

Embodiment 2

[0044] A liquid cement chromium removal grinding aid is prepared from the following raw materials in parts by weight: 10 parts of a grinding aid dispersant, 45 parts of a reducing agent, 30 parts of water, and 1 part of an anti-crystallization agent; the grinding aid dispersant is Triethanolamine; Described reducing agent is sodium thiosulfate; Described anti-crystallization agent is made through the following steps:

[0045] (1) Prepare A solution: weigh 7 parts of acrylic acid, 0.3 part of thiopropionic acid and 12 parts of deionized water, stir and dissolve to make A solution;

[0046] (2) Prepare B solution: pulverize the diaobai block, weigh 0.4 parts, dissolve in 27 parts of deionized water, stir and dissolve to make B solution;

[0047] (3) Add 43 parts of deionized water into the reaction kettle, then stir and add 75 parts of methallyl polyoxyethylene ether, heat to 30°C, and control it to a constant temperature of 30°C. After all of them are dissolved, add 0.5 parts o...

Embodiment 3

[0059] A liquid cement chromium removal grinding aid is prepared from the following raw materials in parts by weight: 20 parts of grinding aid dispersant, 60 parts of reducing agent, 40 parts of water, 2 parts of anti-crystallization agent; the grinding aid dispersant is Glycerin; The reducing agent is sodium pyrosulfite; The anti-crystallization agent is made through the following steps:

[0060] (1) Prepare A solution: weigh 10 parts of acrylic acid, 0.4 part of thiopropionic acid and 13 parts of deionized water, stir and dissolve to make A solution;

[0061] (2) Prepare B solution: pulverize the diaobai block, weigh 0.5 parts, dissolve in 30 parts of deionized water, stir and dissolve to make B solution;

[0062] (3) Add 45 parts of deionized water into the reaction kettle, then stir and add 80 parts of methallyl polyoxyethylene ether, heat to 30°C, and control it to a constant temperature of 30°C. After all of it is dissolved, add 0.6 parts of Hydrogen peroxide, stirring ...

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Abstract

The invention discloses a grinding aid for removing chromium from liquid cement and a preparation method of the grinding aid, and belongs to the technical field of cement grinding. The grinding aid for removing chromium from liquid cement is prepared from the following raw materials in parts by weight: 5-20 parts of a grinding aid dispersant, 30-60 parts of a reducer, 20-40 parts of water and 0.5-2 parts of an anti-crystallization agent. According to the invention, sodium metabisulfite or sodium thiosulfate is used as a chromium removal raw material, which can reduce the hexavalent chromium content of the cement from 10-20 ppm to 10 ppm or less than10 ppm. In addition, the anti-crystallization agent used effectively avoids crystallization of the reducer in the solution to ensure the efficiency of removing chromium. The grinding aid dispersant is added in the grinding aid, so that not only are rapid dispersion and rapid reaction of the chromium reducing components facilitated, the chromium removal effect is ensured, but also the cement grinding efficiency and the cement strength are improved, and functions of a product are enriched.

Description

technical field [0001] The invention belongs to the technical field of cement grinding, and in particular relates to a liquid cement chromium removal grinding aid and a preparation method thereof. Background technique [0002] Cement is a powdery hydraulic cementitious material, which can harden in water or air after being stirred with water, and can be used together with sand and gravel to make concrete. [0003] In recent years, the development of the cement industry consumes a large amount of industrial solid waste, and some pollutants are also brought into the cement while consuming the waste. Soluble hexavalent chromium is one of them. During the cement grinding process, the chromium-containing steel balls and cement raw materials in the cement mill are the sources of hexavalent chromium in cement. Hexavalent chromium is poisonous if swallowed / very inhaled, may cause sensitization by skin contact, is more likely to cause genetic defects, and is a persistent hazard to ...

Claims

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Application Information

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IPC IPC(8): C04B24/32C08F283/06C08F220/06C04B103/52
CPCC04B24/32C04B40/0039C04B2103/52C08F283/065C04B24/026C04B22/14C08F220/06C04B24/122
Inventor 李耀宋南京秦尤敏潘玉杰冯恩娟王志强张辉
Owner SHANDONG HONGYI TECH
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