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Liquid hexavalent chromium reducing agent and preparation method thereof, cement and preparation method thereof

A hexavalent chromium and reducing agent technology, applied in the field of building materials, can solve the problems of no reduction, easy to be oxidized, and poor stability of ferrous sulfate, and achieve the effect of reducing content, improving stability, and good stability

Active Publication Date: 2015-04-08
CHINA BUILDING MATERIALS ACAD
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  • Abstract
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  • Application Information

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Problems solved by technology

In addition, other reducing agents have also been studied in the prior art, such as sodium thiosulfate, sodium sulfite and ascorbic acid, but the effects are not obvious
[0004] But the contriver finds that the stability of ferrous sulfate is poor, when ferrous sulfate and cement clinker, gypsum are ground together in cement mill, it is easy to be oxidized, and once ferrous sulfate is oxidized, it no longer possesses reducing water-soluble six chromium capacity

Method used

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  • Liquid hexavalent chromium reducing agent and preparation method thereof, cement and preparation method thereof
  • Liquid hexavalent chromium reducing agent and preparation method thereof, cement and preparation method thereof
  • Liquid hexavalent chromium reducing agent and preparation method thereof, cement and preparation method thereof

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preparation example Construction

[0051] The embodiment of the present invention provides a method for preparing a liquid hexavalent chromium reducing agent, which specifically includes the following steps:

[0052] After uniformly mixing the raw materials for preparing the liquid hexavalent chromium reducing agent, the liquid hexavalent chromium reducing agent is obtained.

[0053] Specifically, in this step, the raw materials for preparing the liquid hexavalent chromium reducing agent include: 11-23 parts by weight of ferrous ions, 2-9 parts by weight of stannous ions, 40-80 parts by weight of solvent, 8-15 parts by weight The dispersant of parts by weight and the stabilizer of 6-13 parts by weight.

[0054] Here, the ferrous ion in this step mainly originates from the ferrous salt for providing ferrous ion, as ferrous sulfate, ferrous chloride, ferrous nitrate, ferrous hydroxide, ferrous bromide etc.; Preferably, the embodiment of the present invention is preferably any one or a mixture of ferrous sulfate ...

Embodiment 1

[0077] In the reactor, after injecting 45 parts by weight of hot water at 30-40°C, 40 parts by weight of ferrous sulfate (containing about 14.7 parts by weight of ferrous ions), 10 parts by weight of stannous sulfate (containing about 5.5 parts by weight of stannous ion), calcium lignosulfonate of 2.5 parts by weight, sodium gluconate of 4 parts by weight, calcium chloride of 7.5 parts by weight are put into reactor and stir to obtain mixture, and mixture is adopted 150 mesh sieves net to filter. 15 parts by weight of triethanolamine, 7.5 parts by weight of polyethylene glycol (molecular weight: 200) and 4 parts by weight of triisopropanolamine were added to the filtered mixture, and the liquid hexavalent chromium reducing agent was obtained after uniform stirring.

[0078] The prepared conventional grade 42.5 cement raw materials were mixed to form a cement batch, and the cement batch was mixed and ground with the hexavalent chromium reducing agent prepared in this example, a...

Embodiment 2

[0080] In the reaction kettle, 45 parts by weight of hot water at 30-40 ° C, 40 parts by weight of ferrous sulfate, 10 parts by weight of stannous sulfate, 2.5 parts by weight of calcium lignosulfonate, 4 parts by weight of gluconic acid Sodium, 7.5 parts by weight of calcium chloride, 15 parts by weight of triethanolamine, 7.5 parts by weight of polyethylene glycol (molecular weight is 200) and 4 parts by weight of triisopropanolamine are stirred evenly to obtain liquid hexavalent chromium reducing agent .

[0081] The prepared conventional grade 42.5 cement raw materials were mixed to form a cement batch, and the cement batch was mixed and ground with the hexavalent chromium reducing agent prepared in this example, and prepared into cement according to the cement preparation process of grade 42.5. Wherein, the weight ratio of the liquid hexavalent chromium reducing agent to the water-soluble hexavalent chromium in the cement batch is 100:1.

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Abstract

The invention discloses a liquid hexavalent chromium reducing agent and a preparation method thereof, cement and a preparation method thereof, relates to the field of building materials, and solves the problem of the poor long-term storage property and unstable reduction effect of a hexavalent chromium reducing agent in the prior art. . The main technical scheme is as follows: the liquid hexavalent chromium reducing agent comprises the following components of 11-23 parts by weight of ferrous ion, 2-9 parts by weight of stannous ion, 40-80 parts by weight of a solvent, 8-15 parts by weight of a dispersing agent and 6-13 parts by weight of a stabilizer. The cement with low hexavalent chromium ion content can be prepared by mixing and grinding of the liquid hexavalent chromium reducing agent, cement clinker, gypsum and mixed materials. The liquid hexavalent chromium reducing agent is used for reduction of hexavalent chromium ions in the cement into insoluble trivalence chromium to reduce the water-soluble hexavalent chromium ion content in the cement.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a liquid hexavalent chromium reducing agent for reducing water-soluble hexavalent chromium in cement, a preparation method thereof, cement and a preparation method thereof. Background technique [0002] Chromium is an inevitable trace element in cement clinker and cement, and it mainly exists in two valence states of 3+ and 6+. The water-soluble hexavalent chromium in cement is highly toxic, which will not only cause serious adverse symptoms to the human body, cause skin pain and ulceration, form cement dermatitis or eczema that is difficult to cure, but also cause the soil to be uncultivable and groundwater undrinkable. Serious consequences. Aiming at the harm caused by water-soluble hexavalent chromium, the European Union issued a special decree requiring that the content of water-soluble hexavalent chromium in cement be controlled below 2ppm (mg / kg). However, the content of...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B22/14C04B22/12
Inventor 李锐范磊文寨军彭明强曹志峰刘晨倪竹君崔健韩颖
Owner CHINA BUILDING MATERIALS ACAD
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