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A kind of reduced chromium type cement and preparation method thereof

A technology of cement and cement clinker, which is applied in the field of cement, can solve the problems of affecting the effect of chromium reduction and strict requirements on operating temperature, and achieve the effects of avoiding pump blocking, strong oxidation resistance, and excellent high temperature resistance

Active Publication Date: 2022-03-11
ANHUI CONCH GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of reduced chromium type cement and preparation method thereof, to solve ferrous sulfate and reduced chromium type cement in the prior art, due to being exposed in the air, ferrous sulfate and reduced chromium type cement all will gradually It is oxidized, which affects the effect of chromium reduction, and there is a technical problem of strict requirements on the use temperature

Method used

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  • A kind of reduced chromium type cement and preparation method thereof
  • A kind of reduced chromium type cement and preparation method thereof
  • A kind of reduced chromium type cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Preparation of reduced chromium cement:

[0063] 1.1 Raw materials:

[0064] 85 parts of cement clinker, 10 parts of cement mixture, 5 parts of gypsum;

[0065] The grinding aid is a single-type chromium-reduced cement grinding aid, and its addition amount is 0.05% of the total weight of the main material;

[0066] Grinding aid raw material consumption is shown in table 1 below:

[0067] Table 1 Embodiment 1 grinding aid raw material list:

[0068]

[0069] 1.2 Preparation method, comprising the following steps:

[0070] (1) preparation of grinding aids

[0071] ①At room temperature, add water into the reaction vessel, add inorganic salt or chromium-reducing additive and stir evenly while stirring; after adding inorganic salt or chromium-reducing additive, stir at a speed of 65r / min for 15min;

[0072] ②Stop stirring, add alcohol amine and stir evenly; after adding alcohol amine, stir at a speed of 65r / min for 4min.

[0073] ③Stop stirring, add organic acid and...

Embodiment 2

[0078] Preparation of reduced chromium cement:

[0079] 2.1 Raw materials:

[0080] 60 parts of cement clinker, 35 parts of cement mixture, 5 parts of gypsum;

[0081] The grinding aid is a single-type chromium-reduced cement grinding aid, and its addition amount is 0.2% of the total weight of the main material;

[0082] Grinding aid raw material consumption is shown in table 2 below:

[0083] Table 2 embodiment 2 grinding aid raw material list:

[0084]

[0085] 2.2 Preparation method, comprising the following steps:

[0086] (1) preparation of grinding aids

[0087] ①At room temperature, add water to the reaction vessel, add inorganic salt or chromium-reducing additive and stir evenly while stirring; after adding inorganic salt or chromium-reducing additive, stir for 5 minutes at a speed of 70r / min;

[0088] ②Stop stirring, add alcohol amine and stir evenly; after adding alcohol amine, stir at a speed of 70r / min for 3 minutes.

[0089] ③Stop stirring, add organic ac...

Embodiment 3

[0094] Preparation of reduced chromium cement:

[0095] 3.1 Raw materials:

[0096] 64.5 parts of cement clinker, 30 parts of cement mixture, and 5 parts of gypsum;

[0097] The grinding aid is a single-type chromium-reduced cement grinding aid, and its addition amount is 0.1% of the total weight of the main material;

[0098] Grinding aid raw material consumption is shown in table 3 below:

[0099] Table 3 embodiment 3 grinding aid raw material list:

[0100]

[0101] 3.2 Preparation method, comprising the following steps:

[0102] (1) preparation of grinding aids

[0103] ①At room temperature, add water into the reaction vessel, add inorganic salt or chromium-reducing additive and stir evenly while stirring; after adding inorganic salt or chromium-reducing additive, stir at a speed of 60r / min for 20min;

[0104] ②Stop stirring, add alcohol amine and stir evenly; after adding alcohol amine, stir at a speed of 60r / min for 5min.

[0105] ③Stop stirring, add organic aci...

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Abstract

The invention provides a reduced-chromium cement and a preparation method thereof, which solves the problem of ferrous sulfate and reduced-chromium cement in the prior art. Due to exposure to air, both ferrous sulfate and reduced-chromium cement will be gradually oxidized , which in turn affects the chromium reduction effect, and there is a technical problem of strict requirements on the use temperature. Its preparation comprises the following components by weight: 10-20 parts of alcohol amine; 5-15 parts of inorganic salt; 2-20 parts of organic acid; 45-83 parts of water. Due to the addition of chromium-reducing grinding aid in the present invention, it not only has the grinding-aiding effect of the grinding aid itself, but also has strong oxidation resistance, is suitable for long-term storage, and can avoid storage being oxidized and affecting the chromium-reducing effect; the finished product is uniform solution, which can avoid the phenomenon of sediment accumulation and easy pump blockage; and has excellent high temperature resistance, which can well adapt to the temperature change of cement working conditions; the production process is simple, easy to operate and quality control, and has obvious technical advantages and a broad market prospect.

Description

technical field [0001] The invention relates to a cement, in particular to a chromium-reduced cement and a preparation method thereof. Background technique [0002] Cement is the basic material for national economic construction, and is widely used in industrial construction and civil construction. The water-soluble hexavalent chromium in cement is mainly brought in by limestone, iron tailings, silica-alumina materials, mixed materials and refractory materials in raw materials. Because hexavalent chromium has strong oxidizing and corrosive properties, long-term exposure will cause "skin eczema", and a large amount of intake may even lead to adverse consequences such as cancer and mutation. In the environment of long-term rainwater flushing, it will also cause groundwater quality and soil chromium pollution, resulting in the hidden danger of chromium poisoning. [0003] In order to control the content of water-soluble hexavalent chromium in cement and reduce the harm to huma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/00C04B7/52C04B24/16C04B103/52
CPCC04B7/00C04B7/52C04B40/0039C04B2103/52C04B24/122C04B22/147C04B24/16C04B22/124C04B22/14
Inventor 熊玉兰韩礼张冲吴小波周文陈曦宋利丽
Owner ANHUI CONCH GRP
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