Cement retarder and its preparation method and application

A cement retarder and cement technology, which is applied in the field of building materials, can solve the problems of not being able to adjust the setting time and not being able to use cement retarders, and achieve the effects of low cost, increased strength, and avoiding environmental pollution

Active Publication Date: 2021-07-13
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 and its preparation method and application
  • Cement retarder and its preparation method and application
  • Cement retarder and its preparation method and application

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: 50-90 parts of phosphogypsum; 6-47 parts of desulfurized ash; 1-3 parts of mineral powder; 0-3 parts of limestone powder; Specific surface area of ​​the mineral powder ≥ 500m 2 / Kg. The above-mentioned cement retarder realizes the comprehensive treatment of desulfurization ash and phosphogypsum through simple means, turns waste into wealth, saves energy and protects the environment, and is economical and applicable with low cost. It alleviates the dilemma of land occupation and environmental pollution caused by the low utilization rate of desulfurization ash and phosphogypsum, and provides qualified cement retarders for cement production enterprises, which has a very broad 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 Patents(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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