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Cement grinding auxiliary agent for reducing content of free calcium in cement and preparation method of cement grinding auxiliary agent

A technology of cement grinding aid and free calcium, which is applied in the field of cement grinding aid to achieve the effect of eliminating adverse effects

Inactive Publication Date: 2018-02-23
NINGXIA QINGTONGXIA XIXIA KERUN BUILDING MATERIALCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the control of free calcium in cement is concentrated on the control of cement production process, such as feed ratio, grinding fineness, etc., and no one has explored cement grinding aids to find out through the addition of cement grinding aids ways to reduce free calcium

Method used

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  • Cement grinding auxiliary agent for reducing content of free calcium in cement and preparation method of cement grinding auxiliary agent
  • Cement grinding auxiliary agent for reducing content of free calcium in cement and preparation method of cement grinding auxiliary agent
  • Cement grinding auxiliary agent for reducing content of free calcium in cement and preparation method of cement grinding auxiliary agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A cement grinding aid for reducing the free calcium content of cement, made of the following raw materials in weight percentage:

[0022]

[0023] The preparation method is as follows: a preparation method of a cement grinding aid that reduces the free calcium content of cement, adding sodium gluconate and straw ash into water, stirring evenly, heating the solution to 40-50°C, adding calcium lignosulfonate, Stir and stand still, add pimelic acid and ethylenediamine phosphate in sequence when the temperature of the solution is 25-30°C, and stir evenly to obtain the cement grinding aid.

Embodiment 2

[0025] A cement grinding aid for reducing the free calcium content of cement, made of the following raw materials in weight percentage:

[0026]

[0027] Its preparation method is with embodiment one.

Embodiment 3

[0029] A cement grinding aid for reducing the free calcium content of cement, made of the following raw materials in weight percentage:

[0030]

[0031]

[0032] Its preparation method is with embodiment one.

[0033] Add the cement grinding aids of Examples 1, 2, and 3 at a mass ratio of 0.45% of cement, and the cement material ratio is as follows: 76% clinker, 4% gypsum, 5% lime, and 15% coal gangue. Sampling the finished cement product, adding water and stirring for 30 minutes, standing still for 3 hours and watering for curing, then measuring the free calcium content by the glycerol-ethanol method, the test results are shown in the table below.

[0034]

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PUM

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Abstract

The invention discloses a cement grinding auxiliary agent for reducing the content of free calcium in cement. The cement grinding auxiliary agent is prepared from the following raw materials shown inthe description in percentage by weight. The invention also provides the preparation method of the cement grinding auxiliary agent. The method provided by the invention reduces the content of the freecalcium in the cement by adding the auxiliary agent from a viewpoint of the cement grinding auxiliary agent, and provides an additional option for enterprises which have more difficulty or instability in process condition control to eliminate adverse effects caused by the free calcium in the use process of the cement.

Description

Technical field: [0001] The invention relates to a cement grinding aid, in particular to a cement grinding aid for reducing the free calcium content of Portland cement and a preparation method thereof. Background technique: [0002] Cement clinker free calcium is an important quality index related to the quality of cement. It indicates the remaining degree of calcium oxide combined with silicon oxide, aluminum oxide, and iron oxide in the calcining of raw materials. Its level directly affects the stability and cookedness of cement. material strength. When the ingredients are improper, the raw material is too coarse or the calcination is poor, free calcium that has not been absorbed will appear in the clinker. During the calcination process of cement clinker, most of CaO can be combined with acidic oxides to form tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite and other minerals. However, due to the influence of raw material compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18C04B103/52
CPCC04B40/0039C04B2103/52C04B24/04C04B18/101C04B24/003C04B24/10C04B24/18C04B22/002
Inventor 郭登科李阳
Owner NINGXIA QINGTONGXIA XIXIA KERUN BUILDING MATERIALCO