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Method for producing low-alkali Portland cement by using industrial solid waste

A Portland cement and solid waste technology, applied in the direction of cement production, etc., can solve the problem of high alkali content, and achieve the effects of saving the use of iron powder, reducing production costs, and reducing consumption

Active Publication Date: 2012-10-17
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

[0005] The purpose of the present invention is to provide a method for producing low-alkali Portland cement using industrial solid waste to solve the problem of high alkali content in traditionally produced cement

Method used

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  • Method for producing low-alkali Portland cement by using industrial solid waste
  • Method for producing low-alkali Portland cement by using industrial solid waste
  • Method for producing low-alkali Portland cement by using industrial solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A. Raw ingredients

[0035] Limestone mining waste slag 75.0% (including 10.0% lime kiln dust), granulated blast furnace slag 7.0%, silica mineral processing waste slag 10.0%, converter steel slag 8.0%.

[0036] B. Clinker calcination

[0037] Determine the three ratios of clinker: KH: 0.930; N: 2.8, P: 1.60; the raw meal powder is preheated and calcined in a dry-process cement rotary kiln, and fired at a high temperature of 1400°C until it is partially melted. Calcium acid as the main mineral hydraulic gelling substance - Portland cement clinker.

[0038] C. Cement grinding

[0039] Add 6.0% coagulant (industrial by-product desulfurization gypsum) to the clinker of low-alkali Portland cement, and grind it into low-alkali Portland cement 。

Embodiment 2

[0041] A. Raw ingredients

[0042] Limestone mining waste residue is 72.5% (including 10.0% lime kiln dust), granulated blast furnace slag is 10.0%, silica mineral processing waste residue is 8.0%, and converter steel slag is 9.5%.

[0043] B. Clinker calcination

[0044] Determine the three rate values ​​of clinker: KH: 0.910, N: 2.7, P: 1.50. In the dry cement rotary kiln, the raw meal powder is preheated, calcined, and burned at a high temperature of 1400 ° C until it is partially melted to obtain a hydraulic gelling substance with calcium silicate as the main mineral - Portland cement clinker.

[0045] C. Cement grinding

[0046] Add 6.0% coagulant (industrial by-product desulfurization gypsum) to low-alkali Portland cement clinker, and grind it into low-alkali Portland cement with alkali content 。

Embodiment 3

[0048] A. Raw ingredients

[0049] Limestone mining waste slag 70.0% (including 10.0% lime kiln dust), granulated blast furnace slag 12.0%, silica mineral processing waste slag 6.0%, converter steel slag 12.0%.

[0050] B. Clinker calcination

[0051]Determine the clinker three-rate value: clinker three-rate value: KH: 0.890, N: 2.6, P: 1.40. In the dry cement rotary kiln, the raw meal powder is preheated, calcined, and fired at a high temperature of 1400°C until it is partially melted to obtain a hydraulic gelling substance with calcium silicate as the main mineral----Portland cement clinker.

[0052] C. Cement grinding

[0053] Add 6.0% coagulant (industrial by-product desulfurization gypsum) to the clinker of low-alkali Portland cement, and grind it to make low-alkali Portland cement (low-alkali) with an alkali content of less than 0.50%. 。

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Abstract

The invention discloses a method for producing low-alkali Portland cement by using industrial solid waste and aims to overcome the problem that alkali content in cement produced by using traditional methods is high. The method comprises the following steps: A, preparation of the raw materials of 70 to 75% of mining debris of limestone, 7.0 to 12.0% of granulated blast-furnace slag, 6.0 to 10.0% of rejects of silica and 8.0 to 12.0% of converter steel slag; B, clinker calcination; and C, cement grinding. The method provided in the invention has the following characteristics: rejects of silica are used as a silico-regulating material, and not only the characteristic of low alkali content of the rejects of silica is made use of, but also the silica modulus N of the clinker can be adjusted by adjusting the proportion of the rejects of silica so as to inhibit the probability of skinning of a preheater and ring formation in a rotary kiln caused by excessively good burnability of materials. Lime kiln ash, the granulated blast-furnace slag and the converter steel slag are subjected to high temperature calcination, so alkali in the above-mentioned materials greatly volatilizes; therefore, alkali content in the raw materials is decreased, thereby meeting compounding requirements and creating conditions for production of low alkali cement.

Description

technical field [0001] The invention relates to a method for producing low-alkali Portland cement. Background technique [0002] The "alkali-aggregate reaction" caused by high alkali content has great damage to concrete. Therefore, controlling the alkali content in cement is the most effective means to reduce the alkali content of concrete. "General Portland Cement" GB175-2007 standard 7.2 technical requirements, [0003] "Alkali content is used as a selective indicator, and the alkali content in cement is determined by Na 2 O+0.658K 2 The calculated value of O indicates that if active aggregate is used, when the user requests to provide low-alkali cement, the alkali content in the cement should not exceed 0.6% or be determined through negotiation between the buyer and the seller. " [0004] The alkali content in traditionally produced cement is generally between 0.5-3.%, and the alkali content of cement clinker produced with these raw materials is generally 0.7--1.2%, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/36
CPCY02P40/10
Inventor 武学龙翟胜利鄢平王志军贾国林杨建军
Owner 嘉峪关祁连山水泥有限公司
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