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Cement retarder and preparation method thereof

A technology of cement retarder and cement clinker, which is applied in the field of cement retardation to achieve the effect of simple process

Active Publication Date: 2012-10-03
史汉祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of filter residue containing a large amount of water and soluble sulfate acidity cannot be directly used as a cement retarder and needs to be treated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] Taking the iron-making and steel-making slag of the invention patent announced by CN100453148C as the obtained desulfurization product filter cake after the absorbent absorbs sulfur dioxide in the flue gas, an embodiment of the method for processing and preparing the cement retarder is:

[0010] After absorbing sulfur dioxide, the ironmaking and steelmaking slag slurry is filtered and separated to obtain the desulfurization product filter cake, and the desulfurization product filter cake is washed with neutral water for 1 to 4 times to increase the pH value of the filter cake from 5 to 6 to 6.9. Good equipment, so that the weight ratio of mechanically entrained water contained in the filter cake filtered by the last washing is 12%. Add lime or dry-milled powdered steel-making slag or iron-making slag to the washed filter cake to mix it evenly with the filter cake, and the pH value of the filter cake rises to 8. The filter cake after adding lime or dry-milled powdered st...

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PUM

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Abstract

The invention discloses a cement retarder prepared from a desulphurization product, which is obtained after sulfur dioxide in a smoke gas is absorbed by using ironmaking and steelmaking slag as an absorbent, as a main raw material, and a preparation method thereof. Ironmaking and steelmaking slag slurry after absorbing the sulfur dioxide is filtered and separated to obtain a desulphurization product filter cake; the filter cake is washed by neutral water; then the washed filter cake is filtered by using equipment with a better filtering effect until the weight ratio of mechanically-entrapped water in the filter cake is not more than 15%; lime or dryly ground powder steelmaking slag or ironmaking slag is added to the washed filter cake to be uniformly mixed with the filter cake; the filtercake after the lime or the dryly ground powder steelmaking slag or ironmaking slag is added is dried by hot air in a drying kiln; and the dried filter cake is the cement retarder which can be pulverized together with cement clinker.

Description

technical field [0001] The invention belongs to the technical field of cement retardation, and in particular relates to a main raw material for preparing a cement retarder and a method for preparing the cement retarder by using steel slag or a desulfurization product obtained by absorbing sulfur dioxide in flue gas as an absorbent. technical background [0002] When cement is mixed with the right amount of water, what begins to form is a malleable paste that is workable. As time goes on, the slurry gradually loses its plasticity and becomes a compact state that cannot flow. After that, the strength of the slurry gradually increases until it finally becomes a stone-like solid with considerable strength. This process is called setting and hardening of cement. The coagulation process is divided into initial coagulation and final coagulation, expressed by the time after water is added. For example, the national standard stipulates that the initial setting of ordinary Portland ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B09B3/00C04B22/00
CPCC04B40/0039Y02W30/91C04B18/142C04B22/064C04B40/0028C04B18/0418
Inventor 史汉祥
Owner 史汉祥