Method for producing road water permeable brick by using steel slag

A technology for permeable bricks and steel slag, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of complex air-permeable conversion manufacturing process, high expansion of air-permeable bricks, and easy cracking of air-permeable bricks. Good product performance, reduced expansion, not easy to crack

Inactive Publication Date: 2013-01-02
北京中冶设备研究设计总院有限公司
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  • Application Information

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Problems solved by technology

The above-mentioned existing methods of producing permeable bricks with steel slag all use the fine-grained steel tailings after magnetic separation of steel slag by hot stuffing method as the main raw material of permeable bricks, in which the contents of f-CaO and f-MgO are relatively high, and it

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  • Method for producing road water permeable brick by using steel slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Firstly, sieve the steel slag from the slag field after wheel granulation, and then dry it, and use the sieve with steel slag particle size ≥ 5mm directly as permeable brick aggregate, by weight percentage: CaO content 45%, Fe 2 o 3 Content 16.1%, SiO 2 The content is 12.75%, and the moisture content is 1%. Dry the undersieve, blast furnace slag, cement clinker, and desulfurized gypsum with a steel slag particle size ≤ 5mm until the moisture content is below 1%, and grind them to 0.045mm square hole sieve respectively. The remaining 4.8%.

[0013] (2) Mix the ground steel slag and slag powder with the cement clinker and gypsum produced by the dry process production line according to the weight percentage, and grind them together in the mill to 3.3% of the 0.045mm square hole sieve. After mixing Permeable brick cementitious material can be obtained. The cementitious material and steel slag aggregate are mixed in a ratio of 3:7, so that the weight percentage of eac...

Embodiment 2

[0017] (1) Firstly, sieve the steel slag from the slag field after wheel granulation, and then dry it, and use the sieve with steel slag particle size ≥ 5mm directly as permeable brick aggregate, by weight percentage: CaO content 40%, Fe 2 o 3 Content 18%, SiO 2 The content is 14.85%, and the moisture content is 0.7%. The undersieve, blast furnace slag, cement clinker, and desulfurized gypsum with steel slag particle size ≤ 5mm are dried until the moisture content is below 1%, and they are respectively ground to 0.045mm square hole sieve. 5.5%.

[0018] (2) Mix the ground steel slag and slag powder with the cement clinker and desulfurized gypsum produced by the new dry process production line according to the weight percentage, and grind them together in the mill to 4.8% of the 0.045mm square hole sieve, After mixing, the permeable brick cementitious material can be obtained. The mixed cementitious material and steel slag aggregate are mixed in a ratio of 1:3, so that the w...

Embodiment 3

[0022] (1) Firstly, sieve the steel slag from the slag field after wheel granulation, and then dry it, and use the sieve with steel slag particle size ≥ 5mm directly as permeable brick aggregate, by weight percentage: CaO content 47%, Fe 2 o 3 Content 15.2%, SiO 2 The content is 12.04%, and the moisture content is 0.9%. Dry the undersieve, blast furnace slag, cement clinker, and desulfurized gypsum with a steel slag particle size ≤ 5mm until the moisture content is below 0.9%, and grind them to 0.045mm square hole sieve respectively. The remaining 3.5%.

[0023] (2) Mix the ground steel slag and slag powder with the cement clinker and gypsum produced by the new dry process production line according to the weight percentage, and grind them together in the mill until the remaining 3.0% of the 0.045mm square hole sieve is mixed. After that, the permeable brick cementitious material can be obtained. The mixed cementitious material and steel slag aggregate are mixed in a ratio o...

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Abstract

Disclosed is a method for producing a road water permeable brick by using steel slag. The method is characterized in that the steel slag which is from slag fields and are subjected to wheel-style water quenching and pelletization are subjected to screening, wherein the steel slag larger than 5mm is directly used as aggregate, and the steel slag smaller than 5mm is used as cementing materials; each raw material is dried until the moisture content of the raw material is 0.01%-1%; the steel slag smaller than 5mm is ground into micro powders with 400m <2>/Kg specific surface areas, and then cement clinkers, gypsum and slag micro powders are jointly used as the cementing materials for mixing grinding, wherein the proportion of the cementing materials is 70%-80% of the steel slag aggregate, 10%-20% of the slag micro powders, 5%-10% of the steel slag micro powders, 3%-5% of the cement clinkers and 2%-5% of the desulfuration gypsum; and then the steel slag aggregate, the cementing materials and water are stirred according to a water-cement ratio of 0.25-0.35, the mixed materials are filled into a mold for mechanical mashing and pressing, finally molding pressing is performed, and 5 hours of water spraying curing of the steel slag water permeable brick is performed. The method for producing the road water permeable brick by using the steel slags has the advantages of being high in steel slag utilization ratio and simple in production process, the quality of the water permeable brick can reach national standard requirements, and the water permeable brick is difficult to crack.

Description

Technical field: [0001] The invention relates to the technical fields of environmental protection and steel slag comprehensive utilization, in particular to a method for producing pavement permeable bricks using steel slag. Background technique: [0002] Steel slag is a by-product produced in the steelmaking process, and its main content is f-CaO and f-MgO. f-CaO and f-MgO in steel slag are formed at a temperature higher than that of cement clinker. The structure is dense and the hydration is very slow. When f-CaO meets water, it forms Ca(OH) 2 , the volume expands by 98%; fMgO forms Mg(OH) when it meets water 2 , with a volume expansion of 148%. It is easy to cause cracks in concrete roads and bricks and other building materials mixed with steel slag due to expansion in hardened cement paste. Therefore, steel slag needs to be effectively treated before use to make f-CaO and f-MgO fully The existing steel slag treatment processes include hot pouring method, slag filling me...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B18/14
CPCY02W30/91
Inventor 黄迪于伟民高国才朱立江张宏伟果乃涛
Owner 北京中冶设备研究设计总院有限公司
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