Modified steel slag desulfurization ash mixture, preparation method thereof and cementing material

A technology of cementitious material and desulfurization ash, which is applied in cement production and other directions, can solve the problems of slow hydration reaction and poor stability of desulfurization ash, and achieve the effects of improving the cementing activity, the later strength and the utilization rate.

Active Publication Date: 2021-11-23
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Abstract
  • Description
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Problems solved by technology

[0006] The object of the present invention is to address the deficiencies of the prior art, to provide a modified steel slag desulfurization ash mixture and its preparation method, which can eliminate the problems of slow hydration reaction and poor stability of desulfurization ash, and improve the stability of steel slag waste in cementitious materials. The utilization rate in the medium can prepare the cementitious material with higher early strength

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  • Modified steel slag desulfurization ash mixture, preparation method thereof and cementing material
  • Modified steel slag desulfurization ash mixture, preparation method thereof and cementing material

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preparation example Construction

[0030] The invention provides a method for preparing a modified steel slag desulfurization ash mixture, comprising the following steps:

[0031] S1, add water to the desulfurization ash to obtain wet desulfurization ash;

[0032] S2. Adding moist desulfurization ash and high-temperature steel slag into a high-temperature oxidation furnace, introducing an oxidizing gas into the high-temperature oxidation furnace to carry out an oxidation reaction to obtain a modified mixture; the high-temperature steel slag is molten slag produced by steelmaking, The temperature of the high-temperature steel slag is 400-900°C;

[0033] S3, cooling and screening the modified mixture to obtain modified steel slag and modified desulfurization ash;

[0034] S4, crushing, sieving, and magnetically separating the modified steel slag to obtain modified steel slag powder;

[0035] S5. Mix the modified steel slag powder with the modified desulfurization ash, homogenize and mechanically grind to obtain...

Embodiment 1

[0052] Add 25wt% water to the desulfurization ash to obtain wet desulfurization ash. Set a part of the wet desulfurization ash at the bottom of the high temperature oxidation furnace, then pour 900°C high temperature steel slag into the high temperature oxidation furnace, close the high temperature oxidation furnace, and evenly spray another part of the wet desulfurization ash to the high temperature through the feed port above the furnace. On the surface of steel slag, pass 5Nm into the high temperature oxidation furnace 3 Oxygen-air mixed gas for oxidation reaction to obtain a modified mixture. In the high-temperature oxidation furnace, the mass ratio of high-temperature steel slag to desulfurization ash is 2:1, and the oxidation reaction time is 5 hours.

[0053] The modified mixture is cooled to below 100°C, and the modified steel slag and modified desulfurization ash are screened through a sieving machine. The modified steel slag is crushed, screened, and magnetically s...

Embodiment 2

[0056] Add 35wt% water to the desulfurization ash to obtain wet desulfurization ash. Set a part of the wet desulfurization ash at the bottom of the high temperature oxidation furnace, then pour 600°C high temperature steel slag into the high temperature oxidation furnace, close the high temperature oxidation furnace, and evenly spray another part of the wet desulfurization ash to the high temperature through the feed port above the furnace. On the surface of steel slag, pass 10Nm into the high temperature oxidation furnace 3 Oxygen-air mixed gas for oxidation reaction to obtain a modified mixture. In the high-temperature oxidation furnace, the mass ratio of high-temperature steel slag to desulfurization ash is 1:1, and the oxidation reaction time is 8 hours.

[0057] The modified mixture is cooled to below 100°C, and the modified steel slag and modified desulfurization ash are screened through a sieving machine. The modified steel slag is crushed, screened, and magnetically ...

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Abstract

The invention provides a preparation method of a modified steel slag and desulfurized ash mixture, which comprises the following steps: firstly, adding water into desulfurized ash to obtain wet desulfurized ash; secondly, adding the wet desulfurized fly ash and high-temperature steel slag into a high-temperature oxidation furnace, introducing oxidizing gas into the high-temperature oxidation furnace, and carrying out oxidation reaction to obtain a modified mixture; thirdly, cooling and screenign the modified mixture, and obtaining modified steel slag and modified desulfurized fly ash; carrying out crushing, screening and magnetic separation on the modified steel slag to obtain modified steel slag powder; and finally, mixing the modified steel slag powder with the modified desulfurized fly ash, and carrying out homogenization treatment and mechanical grinding to obtain the modified steel slag desulfurized fly ash mixture. The prepared modified steel slag and desulfurized ash mixture is used as a main component of a cementing material, so that the utilization amount of steel slag is increased, the production and preparation cost of the cementing material is reduced, and the early performance of the cementing material is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of using industrial solid waste to prepare cementitious materials, and in particular relates to a modified steel slag desulfurization ash mixture, a preparation method thereof and a cementitious material. Background technique [0002] In the context of the goal and background of carbon neutrality, the carbon emissions of the traditional cementitious material cement industry will be reduced from 1.375 billion tons in 2020 to 242 million tons in 2050. The industry is facing huge pressure to reduce carbon emissions. How to reduce CO 2 Emissions are a problem that the industry needs to solve urgently. [0003] Industrial solid waste collaborative development of new low-carbon cementitious materials can replace traditional cement, reduce cement clinker production, and reduce CO 2 Emissions are one of the important measures for the cement industry to achieve carbon neutrality. At the same time, my country's soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/147C04B7/21
CPCC04B7/28C04B7/147C04B7/21Y02P40/10
Inventor 姜明明郭华军邵雁刘子豪熊劲向浩许晓明胡国峰刘颖蒋庆肯
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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