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Cement retarder as well as preparation method and application thereof

A cement retarder and cement technology, applied in the field of building materials, can solve the problems of not being able to use a cement retarder, not being able to adjust the setting time, etc., and achieving the effects of low cost, improved strength and good stability

Active Publication Date: 2018-09-28
华润水泥技术研发(广西)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the raw materials include desulfurized ash and phosphogypsum, the mixture of the two cannot adjust the setting time, so it cannot be used to prepare cement retarders

Method used

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  • Cement retarder as well as preparation method and application thereof
  • Cement retarder as well as preparation method and application thereof
  • Cement retarder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The present embodiment provides a cement retarder and a preparation method thereof, comprising the following steps:

[0045] Step 1, weighing 50% of phosphogypsum, 49% of desulfurized ash, 1% of mineral powder and 0% of limestone powder. Among them, the specific surface area of ​​mineral powder is 510m 2 / Kg.

[0046] Step 2, mixing the above raw materials, atomizing and spraying water, so that the water content of the mixture is 5%.

[0047] Step 3. Put the above mixture in an aging tank and age it in a closed environment for 24 hours. The temperature range during the aging process is 50-80° C. to obtain a cement retarder.

Embodiment 2-6

[0049] With reference to the preparation method of the cement retarder in Example 1, according to the mass percentage of each raw material in Table 1, the cement retarders of Examples 2-6 and Comparative Examples 1-3 were prepared.

[0050] Table 1

[0051]

[0052] In Table 1, slag is blast furnace slag that has not been ground. The specific surface area is 100m 2 / Kg.

[0053] In limestone powder, the content of calcium carbonate is 85%, and the specific surface area is 600m 2 / Kg.

[0054] The specific surface area of ​​fly ash is 800m 2 / Kg.

Embodiment 7

[0056]Get the cement retarder of embodiment 1-6 and comparative example 1-4, above cement retarder and cement clinker, limestone and high silicon are mixed and ground respectively, and the percentage composition of each raw material is as shown in table 2, Cement corresponding to the cement retarders of Examples 1-6 and Comparative Examples 1-4 were prepared.

[0057] Table 2

[0058]

[0059]

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Abstract

The invention relates to a cement retarder which is prepared from the following raw materials in parts by weight: 50 to 90 parts of ardealite, 6 to 47 parts of desulfurized fly ash, 1 to 3 parts of mineral powder and 0 to 3 parts of limestone flour, wherein the specific surface area of the mineral powder is more than or equal to 500 m<2> / Kg. The cement retarder realizes comprehensive treatment ofthe desulfurized fly ash and the ardealite through simple measures, so that wastes are turned into treasures, energy is saved, and the environment is protected; furthermore, the cement retarder is economical, practical and low in cost. The dilemma problem of occupation and environmental pollution which are caused by low utilization rate of the desulfurized fly ash and the ardealite for an enterprise is relieved, and a qualified cement retarder is provided for a cement production enterprise; therefore, the cement retarder has a very wide application prospect.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a cement retarder and a preparation method and application thereof. Background technique [0002] Desulfurization ash is the industrial waste discharged from the float glass factory after adopting the desulfurization process, and usually contains more calcium sulfate dihydrate (CaSO 4 2H 2 O), a small amount of calcium hydroxide and calcium sulfite, pH=10-13, because of its composition containing calcium sulfite, when used as a cement retarder, it is easy to cause cement, concrete later volume expansion, strength decline, serious It may even cause cracking. Therefore, it is currently impossible to directly use desulfurized ash to replace natural gypsum or desulfurized gypsum as a cement retarder in cement concrete. Factories that produce desulfurization ash waste slag lack effective technology, and generally adopt methods such as stockpiling, landfilling or discarding of desu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B7/153C04B7/24C04B103/22
CPCC04B7/153C04B7/24C04B40/0039C04B2103/22C04B22/144C04B22/145C04B22/10C04B22/0006Y02P40/10
Inventor 钟煜曾荣张玲吴有武滕灼光劳里林韦怀珺陈伟胡刚王奕杰彭蓉
Owner 华润水泥技术研发(广西)有限公司
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