Cement hexavalent chromium reducing agent and preparation method thereof

A technology of hexavalent chromium and reducing agent, applied in the field of cement preparation, can solve problems such as genetic defects and skin sensitivity, and achieve the effects of reducing environmental hazards, maintaining long-term effect, and improving reducing activity

Pending Publication Date: 2021-11-19
贵州省鑫瀚蓝环保科技有限公司
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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

Method used

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  • Cement hexavalent chromium reducing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation steps are: dissolve one part of the prepared polycarboxylic acid hyperdispersant in water, add 5 parts of antimony trioxide, quickly shear and disperse with a shear dispersant to form a suspension, and then add 0.2 parts of an antifoaming agent to defoam The agent is a silicone defoamer, the model is XP-17;

[0025] Finally, after stirring for a period of time, add 10 parts of activated carbon fiber-supported nano-iron solution, and stir evenly to obtain the hexavalent chromium reducing agent in the form of suspension.

[0026] Activated carbon fiber-loaded nano-iron solution is prepared by the following method:

[0027] a. After pulverizing the polyacrylonitrile-based activated carbon fiber felt mucous membrane, pass it through a 300-mesh sieve, and place it in a drying oven at 100 degrees Celsius to bake for later use;

[0028] b. The nano-iron is synthesized by liquid phase reduction method, and the nano-iron is washed with deoxygenated deionized wat...

Embodiment 2

[0033] The preparation steps are: dissolve one part of the prepared polycarboxylic acid hyperdispersant in water, add 20 parts of antimony trioxide, quickly shear and disperse with a shear dispersant to form a suspension, and then add 0.5 part of a defoamer to defoam The agent is a silicone defoamer, the model is XP-17;

[0034] Finally, after stirring for a period of time, 15 parts of activated carbon fiber-supported nano-iron solution was added and stirred evenly to obtain a hexavalent chromium reducing agent in the form of a suspension.

[0035] Activated carbon fiber-loaded nano-iron solution is prepared by the following method:

[0036] a. After pulverizing the polyacrylonitrile-based activated carbon fiber felt mucous membrane, pass it through a 300-mesh sieve, and place it in a drying oven at 100 degrees Celsius to bake for later use;

[0037] b. The nano-iron is synthesized by liquid phase reduction method, and the nano-iron is washed with deoxygenated deionized water...

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PUM

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Abstract

The invention discloses a cement hexavalent chromium reducing agent, which is prepared from the following raw materials in parts by weight: 0.2-0.35 part of ferrous sulfate, 5-20 parts of antimony trioxide, 1-5 parts of a polycarboxylic acid hyperdispersant, 0.2-0.5 part of a defoaming agent, 70-90 parts of water and 10-15 parts of an activated carbon fiber supported nano-iron solution. According t o the invention, the activated carbon fiber supported nano-iron can remove Cr in the cement waste residues so as to reduce the harm to the environment and play a role in environment restoration, and antimony trioxide as a hexavalent chromium reduction component shows good reduction activity under the alkaline condition, is not sensitive to temperature and humidity, has great advantages compared with traditional ferrous salt and stannous salt reducing agents, and can keep the long-term effect of the reducing agent.

Description

technical field [0001] The invention relates to the technical field of cement preparation, and more specifically relates to a cement hexavalent chromium reducing agent and a preparation method thereof. Background technique [0002] In recent years, the development of the cement industry has consumed a large amount of industrial solid waste. While consuming waste, some pollutants have also been brought into cement, and soluble hexavalent chromium is one of them. In the cement grinding process, the chromium-containing steel balls and cement raw materials in the cement mill are important 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 the environment. Hexavalent chromium in cement can dissolve into the environment through contact with hardened water, so strictly controlling the hexavalent chromium content in cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B22/149C04B22/06C04B24/24C04B24/42C04B14/386C04B14/34
Inventor 苏舜峰林渊标郭志辉罗祥翰
Owner 贵州省鑫瀚蓝环保科技有限公司
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