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High-reducibility hexavalent chromium reducing agent for cement and preparation method thereof

A hexavalent chromium and reducing agent technology, which is applied in the field of building materials, can solve the problem of excessive reducing agents, and achieve the effect of strong reduction, enhanced reduction ability, and improved reduction ability

Pending Publication Date: 2021-08-17
邢台建德水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the commonly used chemical reduction method to reduce hexavalent chromium cannot achieve good results, and more reducing agents are needed.

Method used

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  • High-reducibility hexavalent chromium reducing agent for cement and preparation method thereof
  • High-reducibility hexavalent chromium reducing agent for cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of activated carbon loaded ferrous sulfate: the specific surface area of ​​100kg is 300m 2 / g of activated carbon, soaked in 250L of 5mol / L ferrous sulfate solution for 30min, took out the activated carbon, and dried it for 30min at a temperature of 150°C to obtain activated carbon-loaded ferrous sulfate.

[0045] Preparation of raw materials: Take 30kg of activated carbon loaded with ferrous sulfate prepared above, prepare 12kg of manganese sulfate, and 10kg of dispersant, wherein the dispersant is sucrose fatty acid ester and polysorbate with a weight ratio of 1:1.

[0046] A method for preparing a hexavalent chromium reducing agent for high-reducibility cement, comprising the following preparation steps: after grinding activated carbon-supported ferrous sulfate into 200-mesh powder, adding manganese sulfate, mixing and stirring evenly, then adding a dispersant, stirring evenly, mixing After uniform stirring, a hexavalent chromium reducing agent for high r...

Embodiment 2

[0048] Difference from Example 1: preparation of raw materials: 35 kg of activated carbon loaded ferrous sulfate, 10 kg of manganese sulfate, and 10 kg of dispersant.

Embodiment 3

[0050] Difference from Example 1: preparation of raw materials: 50 kg of activated carbon loaded ferrous sulfate, 5 kg of manganese sulfate, and 3 kg of dispersant.

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Abstract

The invention relates to the field of building materials, and particularly discloses a high-reducibility hexavalent chromium reducing agent for cement and a preparation method of the high-reducibility hexavalent chromium reducing agent. The hexavalent chromium reducing agent comprises the following raw materials in parts by weight: 30-50 parts of activated carbon loaded ferrous sulfate, 5-12 parts of manganese sulfate and 3-10 parts of a dispersing agent, the preparation method comprises the following steps: grinding the activated carbon loaded ferrous sulfate into powder, adding the manganese sulfate, uniformly mixing and stirring, then adding the dispersing agent, and uniformly stirring to obtain the high-reducibility hexavalent chromium reducing agent for cement. The high-reducibility hexavalent chromium reducing agent for cement can be used for reducing hexavalent chromium ions in cement and cement clinker, the content of the hexavalent chromium ions is effectively reduced, and harm of hexavalent chromium to a human body is reduced.

Description

technical field [0001] The application relates to the field of building materials, more specifically, it relates to a hexavalent chromium reducing agent for high reducing cement and a preparation method thereof. Background technique [0002] Chromium is an unavoidable trace element in cement and cement clinker. Among chromium-containing compounds, hexavalent chromium is the most toxic, with high water solubility and strong permeability. It can easily penetrate into human tissues, irritate the skin and even cause skin ulceration. When the concrete is soaked for a long time or wetted by rainwater, the hexavalent chromium in the cement is easy to leach and flow into the reservoir and other places, and even pollute the drinking water, so that people can eat it. It can lead to anemia, neuritis, and more seriously, cancer. [0003] The toxicity of trivalent chromium is 100 times lower than that of hexavalent chromium, and the toxicity of divalent chromium and chromium itself is v...

Claims

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Application Information

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IPC IPC(8): C04B24/32
CPCC04B40/0039
Inventor 孟增臣许秀军王坚强贾风敏孟云平
Owner 邢台建德水泥有限公司
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