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Cement using stainless steel slag tailing mud as admixture and preparation method thereof

A stainless steel slag and mixed material technology, applied in cement production and other directions, can solve the problems of unstable free calcium content and increase processing cost, and achieve the effect of creating economic value, reducing comprehensive cost and reasonable particle size composition.

Pending Publication Date: 2021-02-19
GUANGXI YUFENG CEMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the price of steel slag is increasing year by year, and its free calcium content is higher and its properties are unstable, so it needs to use a certain activator or use high temperature modification in the processing process, which further increases the processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The stainless steel slag and tailings that have been aged for more than three months are dried and dehydrated to a dry state, and ball milled separately to a specific surface area of ​​483m 2 / kg, Portland cement clinker and desulfurized gypsum are separately ball milled to a specific surface area of ​​355m 2 / kg; according to stainless steel slag tailings: portland cement clinker: desulfurization gypsum = 20:75:5 mixed evenly, to obtain the cement mixed with stainless steel slag tailings.

[0029] The standard consistency of the cement detected was 25.8%, the initial setting time was 139 minutes, and the final setting time was 199 minutes. The stability was tested by the test cake method. The content of hexavalent chromium was 9.66 mg / kg as measured by diphenylcarbazide spectrophotometry, and the content of chloride ion as measured by distillation separation-mercuric nitrate coordination titration was 0.012%. The 3d flexural and compressive strengths are 4.93MPa and ...

Embodiment 2

[0038] The stainless steel slag and tailings that have been aged for more than three months are dried and dehydrated to a dry state, and ball milled separately to a specific surface area of ​​483m 2 / kg, Portland cement clinker and desulfurized gypsum are ball milled separately to a specific surface area of ​​300m 2 / kg; according to stainless steel slag tailings: Portland cement clinker: desulfurization gypsum = 15:80:5 mixed evenly, to obtain the cement mixed with stainless steel slag tailings.

[0039] The standard consistency of the cement detected was 25.8%, the initial setting time was 135 minutes, and the final setting time was 189 minutes. The stability was tested by the test cake method. The content of hexavalent chromium was 7.82 mg / kg as measured by diphenylcarbazide spectrophotometry, and the content of chloride ion as measured by distillation separation-mercuric nitrate coordination titration was 0.012%. The 3d flexural and compressive strengths are 5.02MPa and ...

Embodiment 3

[0046] The stainless steel slag and tailings that have been aged for more than three months are dried and dehydrated to a dry state, and ball milled separately to a specific surface area of ​​483m 2 / kg, Portland cement clinker and desulfurized gypsum are ball milled separately to a specific surface area of ​​300m 2 / kg; According to stainless steel slag tailings: Portland cement clinker: desulfurization gypsum = 18:79:3 mixed evenly, to obtain the cement mixed with stainless steel slag tailings.

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Abstract

The invention discloses cement using stainless steel slag tailing mud as an admixture and a preparation method thereof, and belongs to the technical field of building materials. The cement comprises the following components in parts by weight: 50-95 parts of Portland cement clinker, 15-20 parts of stainless steel slag tailing mud, and 3-6 parts of gypsum. According to the invention, the stainlesssteel slag tailing mud waste residues are used in cement, the prepared cement has standard consistency of not greater than 28%, initial setting time of not less than 45 min, final setting time of notmore than 600 min and qualified stability, the content of water-soluble hexavalent chromium in cement is not greater than 10 mg / kg, the content of chloride ions is not greater than 0.06%, the compressive strength is not less than 42.5 MPa, and the heavy metal leaching value meets standard requirements, thereby not only facilitating reduction of the comprehensive cost of cement and reduction of energy consumption, but also being of great significance to environmental protection.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement using stainless steel slag tailings as a mixed material and a preparation method thereof. Background technique [0002] Steel slag is an indispensable subsidiary product of steelmaking production, how to comprehensively utilize it more effectively and energy-saving has always been a research problem at this stage. The various components in steel slag are quite different due to different steel types and smelting stages. According to different smelting processes, steel slag is mainly divided into converter slag, electric furnace slag, casting residue and stainless steel slag. [0003] my country's stainless steel production has increased significantly, and the resulting stainless steel slag is increasing day by day. Stainless steel slag and tailings are waste residues produced in the late stage of steelmaking and refining in stainless steel factories, and then...

Claims

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Application Information

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IPC IPC(8): C04B7/147C04B7/36
CPCC04B7/147C04B7/36Y02P40/10
Inventor 倪亚峰唐小春董健苗邓玉莲刘骥蒋久芳廖双双隆盛康
Owner GUANGXI YUFENG CEMENT
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