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A kind of chromium reducing agent and its preparation method and cement

A chromium reducing agent and cement technology, which is applied in the field of cement materials, to achieve the effect of reducing the workload of crushing, reducing the possibility of exposure, and long storage time

Active Publication Date: 2022-06-07
唐山冀东水泥外加剂有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to facilitate the storage of materials under the existing long-term construction and environmental protection, the application also provides an environmentally friendly cement

Method used

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  • A kind of chromium reducing agent and its preparation method and cement
  • A kind of chromium reducing agent and its preparation method and cement
  • A kind of chromium reducing agent and its preparation method and cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A chromium reducing agent is sodium nitrite.

Embodiment 2

[0049] A chromium reducing agent, comprising a load body and a protective layer wrapped outside the load body.

[0050] The carrier is modified shell powder with a particle size of 1340 meshes. The loading body is loaded with sodium nitrite, wherein the nitrogen content of the loading body is 0.02 wt % before loading, and the nitrogen content after loading is 0.57 wt %.

[0051] The protective layer is mainly composed of silicone ethylene glycol polymer wax with a small amount of dissolved impurities. Dissolved impurities include residual water carried in raw materials and dissolved gases mixed in the production process.

[0052] The preparation method of above-mentioned chromium reducing agent is as follows:

[0053] 1. Preparation of the carrier:

[0054] The calcined shell powder is soaked in a 4.5 wt% sodium sulfate solution, and the sodium sulfate solution needs to completely immerse the calcined shell powder. Cool down until the liquid is completely frozen, freeze fo...

Embodiment 3～7

[0061] The chromium reducing agent was prepared based on the preparation method of Example 2, and the nitrogen content before and after the loading of the support in the obtained chromium reducing agent are shown in Table 1 below. The nitrogen content of the load before loading is the sampling inspection activity after the preparation of the load, and the iron content of the load after the load is the sampling inspection before the protective layer is coated.

[0062] Table 1. Nitrogen content before and after loading of the support in the chromium-reducing agents of Examples 2-7

[0063] Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Nitrogen content before loading / wt% 0.02 0.01 0.02 0.02 0.01 0.02 Nitrogen content wt% after loading 0.57 0.51 0.6 0.66 0.54 0.51

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Abstract

The application relates to the field of cement materials, and specifically discloses a chromium-reducing agent, a preparation method thereof, and cement, wherein the chromium-reducing agent includes an active ingredient, and the effective ingredient is sodium nitrite. When the chromium-reducing agent is used in cement , the ratio of sodium nitrite to cement is 0.0045~0.01wt%. Sodium nitrite is used as the active ingredient of chromium reducing agent. Compared with ferric sulfite, under the same addition amount, its chromium reducing effect and chromium reducing time are better than Ferrous sulfate.

Description

technical field [0001] The present application relates to cement materials, more particularly, it relates to a chromium reducing agent and its preparation method and cement. Background technique [0002] Cement is a common building material that is widely used in modern buildings. At present, the sources of slag and cement clinker in the raw materials of cement contain water-soluble hexavalent chromium compounds. In order to protect the environment and the health of workers who have been exposed to cement for a long time, it is necessary to add chromium reducers to cement with high hexavalent chromium content in the raw materials. , in order to reduce the hexavalent chromium content. [0003] The most commonly used chromium reducing agent is ferrous sulfate. When the cement is mixed with water, the ferrous ion dissolved and ionized by the ferrous sulfate has a reducing property, and can react with hexavalent chromium to reduce the hexavalent chromium to less toxic ferrous i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/08C04B20/10C04B7/36
CPCC04B22/085C04B20/1051C04B7/60C04B14/28Y02W30/91
Inventor 王立彬刘禹杉高峰魏川苏晓强赵百顺苏鹏举李兴武高茄砾郑立曼肖见祺王思远张楠刘利光陈志明张业明
Owner 唐山冀东水泥外加剂有限责任公司
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