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Method for producing portland cement for road by blending iron ore beneficiation tailings in cement

A technology for road silicate and iron ore is applied in the field of road portland cement production, which can solve the problem of low road cement strength, and achieve the effects of considerable economic benefits, reduction of production costs, and consumption savings.

Inactive Publication Date: 2012-10-10
嘉峪关祁连山水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of this invention is to provide a method for producing road Portland cement by using iron ore dressing tailings in cement to solve the problem of low strength of existing road cement

Method used

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  • Method for producing portland cement for road by blending iron ore beneficiation tailings in cement
  • Method for producing portland cement for road by blending iron ore beneficiation tailings in cement
  • Method for producing portland cement for road by blending iron ore beneficiation tailings in cement

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Experimental program
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Effect test

Embodiment 1

[0036] A. Raw meal ingredients: the following raw material ingredients in the following percentages by weight, iron ore beneficiation tailings 9%, limestone beneficiation waste slag 73%, aeolian sand 6%, granulated blast furnace slag 12%; ground into fine powder.

[0037] B. Clinker calcination

[0038] In the dry process cement rotary kiln, the raw meal powder is preheated, decomposed and calcined, and burned at a temperature of 1100°C until it is partially melted to obtain road Portland cement clinker;

[0039] C, cement batching, grinding

[0040] The road portland cement is prepared according to the conventional method with the following raw material ingredients in weight percentage, 88.0% of road portland cement clinker, 6.0% of desulfurized gypsum, and 6.0% of granulated electric furnace phosphorous slag.

Embodiment 2

[0042] A. Raw material ingredients: the following raw material ingredients in the following weight percentages, iron ore beneficiation tailings 10%, limestone beneficiation waste slag 76%, aeolian sand 5%, granulated blast furnace slag 9%; ground into fine powder.

[0043] B. Clinker calcination

[0044] In the dry-process cement rotary kiln, the raw meal powder is preheated and decomposed and calcined, and burned at a temperature of 1400°C until it is partially melted to obtain road Portland cement clinker;

[0045] C, cement batching, grinding

[0046] The road portland cement is prepared according to the conventional method with the following raw material ingredients in weight percentage, 88.0% of road portland cement clinker, 6.0% of desulfurized gypsum, and 6.0% of granulated electric furnace phosphorous slag.

Embodiment 3

[0048] A. Raw material ingredients: the following raw material ingredients by weight percentage, iron ore beneficiation tailings 11%, limestone beneficiation waste slag 79%, aeolian sand 4%, granulated blast furnace slag 6.0%; ground into fine powder.

[0049] B. Clinker calcination

[0050] In the dry-process cement rotary kiln, the raw meal powder is preheated and decomposed and calcined, and burned at a temperature of 1450°C until it is partially melted to obtain road Portland cement clinker;

[0051] C, cement batching, grinding

[0052] The road portland cement is prepared according to the conventional method with the following raw material ingredients in weight percentage, 88.0% of road portland cement clinker, 6.0% of desulfurized gypsum, and 6.0% of granulated electric furnace phosphorous slag.

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Abstract

The invention discloses a method for producing portland cement for road by blending iron ore beneficiation tailings in cement, and the method is used for solving the problem that the existing road is low in cement strength. The method comprises the following steps of: A. blending raw materials: 9-11% of iron ore beneficiation tailings, 73-79% of limestone beneficiation waste residue, 4-6% of aeolian sand and 6-12% of granulated blast-furnace slag; B. calcining clinker; and C. blending the cement. According to the method, the iron ore beneficiation tailings, the limestone beneficiation waste residue and the granulated blast-furnace slag are utilized as the raw materials, and desulfurized gypsum and granulated electric furnace phosphorous slag are utilized as accessories, thus saving the consumption of natural raw materials and reducing the cement production cost; the produced portland cement for road is higher in wear resistance and better in air shrinkage, is widely applied to a super highway, an airfield runway and other projects; and the product is good in market prospect and considerable in economic benefit.

Description

technical field [0001] The invention relates to a method for producing road Portland cement. Background technique [0002] As a special-purpose cement, road Portland cement is mainly used in places with high wear resistance requirements such as roads and airports. According to the GB13693-2005 standard, the dry shrinkage rate of road cement should not exceed 0.10% in 28 days, and the wear amount in 28 days should not exceed 3.00kg / m 2 , Therefore, road cement is required to contain lower tricalcium silicate (C 3 A) and higher tetracalcium aluminoferrite minerals (C 4 AF). [0003] C 3 Mineral A has the characteristics of rapid hydration, high heat release, and can exert most of its strength within 3 days. The strength is not high, and it hardly grows at the later stage, even shrinks back, and has a large drying shrinkage deformation. Therefore, road cement clinker requires C 3 A<5.0%. [0004] C 4 The hydration rate of AF minerals is between C 3 A and C 3 Betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/36C04B7/22
Inventor 武学龙王玉才赵建清王立花
Owner 嘉峪关祁连山水泥有限公司
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