Preparation method of hexavalent chromium reducing agent for nano-loaded cement

A loaded, hexavalent chromium technology, which is applied in the field of building materials, can solve problems such as water solubility, and achieve the effects of increased reduction efficiency, low dosage, and high reduction efficiency
CN112500013APending Publication Date: 2021-03-16CHINA RESOURCES CEMENT TECH RES DEV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA RESOURCES CEMENT TECH RES DEV
Publication Date
2021-03-16

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Abstract

The invention discloses a preparation method of a hexavalent chromium reducing agent for nano-loaded cement, and belongs to the technical field of preparation of building materials. The method comprises the following specific steps: sequentially adding a certain amount of an antimony compound, organic alkali and a carrier into a glass flask, stirring for a certain time at a certain temperature, and performing standing; and carrying out suction filtration on the obtained precipitate, respectively washing with deionized water and absolute ethyl alcohol, and drying at a certain temperature to obtain the hexavalent chromium reducing agent for the nano-loaded cement. The hexavalent chromium reducing agent prepared by the invention has the advantages of low doping amount, high reduction efficiency, no negative influence on cement-related properties and the like, and the method is simple and easy to operate and has industrial popularization value.
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Description

technical field

[0001] The invention relates to the technical field of building materials, in particular to a preparation method of a hexavalent chromium reducing agent for nano-loaded cement. Background technique

[0002] As a major cement producer, my country's cement output reached 2.33 billion tons in 2019. In the process of cement production, due to the introduction of raw materials, cement inevitably contains a certain amount of heavy metals. The national standard GB 31893-2015 clearly stipulates the limit value of heavy metal content in cement clinker and the limit value of leachable heavy metal content in cement clinker. Taking water-soluble hexavalent chromium with high toxicity as an example, the current national standard stipulates that the content of soluble hexavalent chromium in cement clinker should be below 10ppm, but according to the existing development trend, the content of hexavalent chromium in the new national standard in the future is very high It is...

Claims

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