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A hexavalent chromium reducing agent and preparation method thereof

A reducing agent and hexavalent chromium technology, applied in the field of building materials, can solve problems such as easy loss of reducibility, and achieve the effect of improving the performance of removing hexavalent chromium and reducing the dosage

Active Publication Date: 2022-04-12
内蒙古同佳技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cement is generally alkaline, and many reducing agents can only play a reducing role under acidic conditions, and it is easy to lose their reducing properties under alkaline conditions. Therefore, it is necessary to develop a high-efficiency, cheap, stable and long-term effective The reducing agent reduces highly toxic hexavalent chromium in cement to low toxic trivalent chromium

Method used

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  • A hexavalent chromium reducing agent and preparation method thereof
  • A hexavalent chromium reducing agent and preparation method thereof

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preparation example Construction

[0023] The preparation method of described hexavalent chromium reducing agent comprises:

[0024] (1) At 30°C, mix the solvent, ferrous ions, stannous ions and stabilizers evenly, and filter through a 200-mesh screen to obtain the first mixture;

[0025] (2) After adding the dispersant to the first mixture, mix well;

[0026] (3) Mix heteroetherified melamine resin, sodium p-aminosalicylate, and nano-alumina evenly, then add to the solution in step 2, mix evenly, and then filter through a 200-mesh sieve.

Embodiment 1

[0028] A hexavalent chromium reducing agent, comprising: 17 parts by weight of ferrous ions, 5.5 parts by weight of stannous ions, 3 parts of heteroetherified melamine resins, 1.5 parts of sodium p-aminosalicylate, 0.3 parts of nano-oxidized Aluminum, 50 parts by weight of solvent, 5 parts by weight of dispersant, and 3 parts by weight of stabilizer.

Embodiment 2

[0030] A hexavalent chromium reducing agent, comprising: 11 parts by weight of ferrous ions, 9 parts by weight of stannous ions, 2 parts of heteroetherified melamine resins, 2 parts of sodium p-aminosalicylate, 0.2 parts of nano-oxidized Aluminum, 60 parts by weight of solvent, 4 parts by weight of dispersant, and 4 parts by weight of stabilizer.

[0031] All the other parts are identical with embodiment 1.

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Abstract

The invention discloses a hexavalent chromium reducing agent, comprising: 11-23 parts by weight of ferrous ions, 2-9 parts by weight of stannous ions, 2-4 parts of heteroetherified melamine resin, 1-2 parts of Sodium p-aminosalicylate, 0.2-0.4 parts of nano-alumina, 40-60 parts by weight of the solvent, 4-6 parts by weight of the dispersant, 2-4 parts by weight of the stabilizer; the solvent is triethanolamine, ethyl alcohol Diamine, water, the ratio is 2-4:1-2:6-8; the stabilizer is lignosulfonate.

Description

【Technical field】 [0001] The invention belongs to the technical field of building materials, and in particular relates to a hexavalent chromium reducing agent and a preparation method thereof. 【Background technique】 [0002] Cement is an indispensable building material in the development of the national economy, and it is also one of the most produced artificial building materials in the world. At the same time, the per capita consumption of cement is also an important indicator to measure whether a country is developed. Cement plays a very important role in the development and progress of human civilization. According to the current development of the world's scientific and technological level, no building material can replace cement in a short period of time. [0003] Due to the excessive content of hexavalent chromium in cement and the harm to human beings and the environment, it is imperative to deal with hexavalent chromium in cement. The toxicity of hexavalent chromi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/30C04B7/36C04B24/32C08G12/42
CPCC04B40/0046C04B7/60C08G12/427C04B22/149C04B22/12C04B22/142C04B24/305C04B24/123C04B14/303C04B24/122C04B22/002C04B24/32C04B24/18
Inventor 张祯张宏川张小川
Owner 内蒙古同佳技术发展有限公司