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Method for preparing cement by utilizing oil shale ash

A technology of oil shale ash and cement, which is applied in the field of cement preparation by using oil shale ash, can solve the problems of secondary pollution of the environment, waste of stockpiling costs, and occupying large land, so as to reduce CO2 emissions, reduce heat consumption, reduce The effect of stress on environmental influences

Active Publication Date: 2014-12-03
SHENYANG XINBO IND TECH
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  • Abstract
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Problems solved by technology

[0004] In the past oil shale ash utilization technology, only a small amount was used to make bricks or concrete blocks, and most of them were discarded, which not only occupied a large amount of land, wasted storage costs, but also caused secondary pollution to the environment
[0005] Chinese Patent No. 201110428145.8 "A Method for Preparing Cement Using Oil Shale Waste Residue" discloses the technology of using oil shale ash to make cement. 13%, long process, large investment, high energy consumption

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  • Method for preparing cement by utilizing oil shale ash

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Embodiment Construction

[0017] Below the technical route in the example of the present invention in conjunction with appendix figure 1 Described in detail, but the protection scope of the present invention is not limited by examples.

[0018] (1) Grind the iron powder in the mill to -88μm, with a sieve residue of 12%, and dry the calcium carbide slag with a fineness of 4900 mesh sieve ≤ 14% in the dryer until the moisture content is ≤ 1.5%. The fineness of the oil shale ash after oiling is -88μm, and the sieve residue is 12%, and then the raw meal powder is continuously prepared according to the ratio of oil shale ash 76.4%: carbide slag 18.6%: iron powder 5% by mass, so that the burning raw meal Lime saturation coefficient KH=0.89±0.01, silicon rate SM=1.80±0.1, aluminum rate IM=1.40±0.1, sent to the raw meal homogenization system for homogenization, when the fluctuation range of CaO content in the raw meal composition is ≤±0.2% It is qualified raw material, and the heat source of calcium carbide s...

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Abstract

The invention relates to a method for preparing cement by utilizing oil shale ash. The method comprises process steps of preparing qualified raw materials, sintering the raw materials and mixing and grinding. The method is characterized in that the oil shale ash the weight of which exceeds 30% of the total weight of the raw materials is used. According to the cement prepared by the method, the compressive strength growth rate from 3 d to 28 d is 103.6%, the sintering temperature is effectively reduced by 80 DEG C, heat consumption of clinker is reduced by 12%, and power consumption needed for grinding is reduced by 15%.

Description

technical field [0001] The invention relates to the field of building material production, in particular to a method for preparing cement by using oil shale ash. Background technique [0002] my country's oil shale reserves are very rich, but a large amount of oil shale ash is produced in the process of extracting oil from oil shale. Based on an average oil content of 7% and an oil recovery rate of 75%, a factory with an annual output of 100,000 tons of shale oil, The discharge of oil shale ash will reach 1.8 million tons per year. [0003] SiO in oil shale ash 2 Accounting for 55-65%, other components are CaO, Al 2 o 3 and Fe 2 o 3 , is very close to the clay composition used in conventional cement production, so using oil shale ash to produce cement can greatly save clay resources. [0004] In the past oil shale ash utilization technology, only a small amount was used to make bricks or concrete blocks, and most of them were discarded, which not only occupied a large a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/30C04B7/36
CPCY02P40/10Y02P40/121
Inventor 王新军刘鹤群程云驰
Owner SHENYANG XINBO IND TECH