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A method for preparing calcium-poor silicon-rich ecological cement by step-by-step calcination

An ecological cement and step-by-step calcination technology, which is applied in cement production and other directions, can solve the problems of high preparation cost and low calcination temperature, and achieve the effects of reduced preparation cost, low energy consumption and less pollution discharge

Active Publication Date: 2020-04-24
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a composite cement, the calcination temperature of this cement is low, and the industrial alkali processed by calcination is also significantly less than that of alkali-activated cement, but the use of expensive industrial alkali (caustic soda or soda ash) to provide Na 2 The O component makes the preparation cost still high

Method used

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  • A method for preparing calcium-poor silicon-rich ecological cement by step-by-step calcination
  • A method for preparing calcium-poor silicon-rich ecological cement by step-by-step calcination
  • A method for preparing calcium-poor silicon-rich ecological cement by step-by-step calcination

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Embodiment Construction

[0017] The present invention will be further described in detail through specific examples below, but the present invention is not limited thereto.

[0018] The silicon-aluminum oxide involved in the embodiment has 5 kinds of natural rocks, a kind of coal gangue and a kind of mine tailings, and their chemical composition satisfies that in the remaining mass after calcination at 1000°C, SiO 2 2 o 3 >10% and SiO 2 +Al 2 o 3 >80% (see Table 1); the sodium sulfate used is industrial anhydrous sodium sulfate, of which Na 2 SO 4 content ≥ 98.5%; anthracite coal containing 90% elemental carbon is used as the elemental carbon raw material; the specific types of lime used are quicklime, slaked lime, and carbide slag, and the former two are analytically pure CaO and Ca(OH) 2 , while calcium carbide slag contains 85% (mass ratio) of Ca(OH) 2 The gypsum used includes five kinds of natural dihydrate gypsum, desulfurized gypsum, construction gypsum, anhydrite and calcined gypsum, wher...

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Abstract

The invention belongs to the field of cement materials and particularly relates to a method for preparing poor-calcium and rich-silicon eco-cement with step-by-step calcining. The method is characterized in that three raw materials of sodium sulfate, silica-alumina oxide and elemental carbon are mixed and ground, step-by-step calcining and quick cooling are performed to obtain a calcined material,and the calcined material, limes and gypsum are ground together to prepare the eco-cement. The cement prepared by the invention has the characteristics of low cost, low energy consumption, low carbonemission, waste utilization and the like and has a wide development prospect.

Description

technical field [0001] The invention belongs to the field of new cement materials, and in particular relates to a method for preparing calcium-poor and silicon-rich ecological cement by step-by-step calcination. Background technique [0002] my country is the country with the highest cement production in the world, and most of the cement produced is Portland cement. The calcination temperature of Portland cement reaches 1450°C, high energy consumption and material consumption, high carbon emissions, serious environmental pollution, poor acid resistance, corrosion resistance and durability, and consumes a large amount of high-quality limestone resources. Scientists are always looking for new cement varieties that are more environmentally friendly and cost-effective. The alkali-activated cement that has been studied more recently is a two-component cement composed of an aqueous solution of a strong alkali salt and an active solid oxide powder, in which the typical component i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/04C04B7/24C04B7/38
CPCC04B7/04C04B7/24C04B7/38Y02P40/10
Inventor 彭美勋马洪超聂孟琪张婷何晴张雷刚刘任肖秋国张欣
Owner HUNAN UNIV OF SCI & TECH