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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

Pending Publication Date: 2021-03-16
CHINA RESOURCES CEMENT TECH RES DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to: aim at the above-mentioned existing problems, provide a kind of preparation method of hexavalent chromium reducing agent for nano-loaded cement, solve the problem of water-soluble hexavalent chromium in cement

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a hexavalent chromium reducing agent for nano-loaded cement, comprising the following steps:

[0023] (1) Weigh 2 g of antimony trichloride, place it in a three-neck glass flask, and place the glass flask in a constant temperature water bath at 30°C.

[0024] (2) Use a constant pressure funnel to add the ethylenediamine solution dropwise to the glass flask, the ratio of the ethylenediamine solution to antimony trichloride is 100:1, and use a constant speed electric stirrer to stir the solution. 500r / min.

[0025] (3) Add wollastonite into the flask, the mass ratio of wollastonite to antimony trichloride is 0.2:1, and continue to stir for 30 minutes.

[0026] (4) After the suspension was allowed to stand for 30 minutes, it was suction-filtered, washed twice with deionized water and alcohol, and the obtained solid was dried in an oven at 80° C. for 4 hours.

Embodiment 2

[0028] A method for preparing a hexavalent chromium reducing agent for nano-loaded cement, comprising the following steps:

[0029] (1) Weigh 2 g of antimony trichloride, place it in a three-neck glass flask, and place the glass flask in a constant temperature water bath at 60°C.

[0030] (2) Use a constant pressure funnel to add ethylenediamine solution dropwise to the glass flask, the ratio of ethylenediamine solution to antimony trichloride is 60:1, and use a constant speed electric stirrer to stir the solution. 1000r / min.

[0031] (3) Add wollastonite into the flask, the mass ratio of wollastonite to antimony trichloride is 1:1, and continue to stir for 120 minutes.

[0032] (4) After the suspension was allowed to stand for 60 minutes, it was suction-filtered, washed five times with deionized water and alcohol respectively, and the obtained solid was dried in an oven at 80° C. for 4 hours.

Embodiment 3

[0034] A method for preparing a hexavalent chromium reducing agent for nano-loaded cement, comprising the following steps:

[0035] (1) Weigh 2 g of antimony trichloride, place it in a three-necked glass flask, and place the glass flask in a constant temperature water bath at 45°C.

[0036] (2) Use a constant pressure funnel to add ethylenediamine solution dropwise to the glass flask, the ratio of ethylenediamine solution to antimony trichloride is 50:1, and use a constant speed electric stirrer to stir the solution. 800r / min.

[0037] (3) Add wollastonite into the flask, the mass ratio of wollastonite to antimony trichloride is 2:1, and continue to stir for 80 minutes.

[0038] (4) After the suspension was allowed to stand for 45 minutes, it was suction-filtered, washed three times with deionized water and alcohol respectively, and the obtained solid was dried in an oven at 80° C. for 4 hours.

[0039] In the above embodiment 1-embodiment 3, the ethylenediamine solution can...

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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.

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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Application Information

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IPC IPC(8): C04B24/12
CPCC04B40/0046C04B22/12C04B24/121C04B24/122C04B22/10C04B22/06C04B22/08C04B22/0006
Inventor 张宾林永权赵有强张玉玲
Owner CHINA RESOURCES CEMENT TECH RES DEV
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