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Method for producing active calcium silicate by using fly ash desilication mother solution

A technology of fly ash and calcium silicate, applied in the direction of silicate, alkaline earth metal silicate, etc., to achieve the effect of remarkable economic benefit, low production cost and high whiteness

Active Publication Date: 2012-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] By retrieving a large number of documents and materials on the production of active calcium silicate by using fly ash, it can be seen that most of the existing technologies only illustrate the scheme design that can co-produce active calcium silicate during the processing and utilization of fly ash, and there is no Carry out detailed research on how to produce active calcium silicate with uniform performance, high whiteness and low impurity content, so a kind of active calcium silicate with good performance in all aspects can be developed, which can reduce production cost and reduce secondary pollution at the same time Calcium has become the need of the market and environmental protection

Method used

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  • Method for producing active calcium silicate by using fly ash desilication mother solution

Examples

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Effect test

Embodiment 1

[0034] Move the desiliconization mother liquor in the process of producing alumina from fly ash into a vertical leaf filter for fine filtration to remove suspended solids in the fly ash desilication mother liquor; : 1 mixed evenly to prepare milk of lime; the milk of lime and the desiliconized semen of fly ash were compared with calcium to silicon (the CaO in the milk of lime and the SiO in the desiliconized semen of fly ash 2 The ratio of the amount of substance) is 0.95 and mixed evenly, moved into the causticization tank, and stirred at a stirring rate of 150r·min -1 1. Carry out causticizing reaction at a reaction temperature of 95°C for 1 hour; move the slurry after the causticizing reaction into a filter for solid-liquid separation to obtain solid-phase calcium silicate slag and liquid-phase sodium hydroxide solution; process water and calcium silicate The slag is mixed evenly according to the liquid-solid ratio of 2:1, moved into the washing tank, and stirred at a stirr...

Embodiment 2

[0036] Move the desiliconization mother liquor in the process of producing fly ash to mullite into a vertical leaf filter for fine filtration to remove suspended solids in the fly ash desilication mother liquor; process water and calcium hydroxide in a liquid-solid ratio of 3:1 mixed evenly to prepare milk of lime; milk of lime and desiliconized semen from fly ash according to the ratio of calcium to silicon (CaO in milk of lime and SiO in desiliconized semen from fly ash 2 The ratio of the amount of substance) is 1.0 and mixed evenly, moved into the causticization tank, and stirred at a stirring rate of 150r·min -1 1. Carry out causticizing reaction at a reaction temperature of 95°C for 1.5h; move the slurry after the causticizing reaction into a filter for solid-liquid separation to obtain solid-phase calcium silicate slag and liquid-phase sodium hydroxide solution; process water and silicic acid Calcium slag is mixed evenly according to the liquid-solid ratio of 2:1, moved ...

Embodiment 3

[0038] Transfer the secondary desiliconization mother liquor in the process of producing fly ash to mullite into a vertical leaf filter for fine filtration to remove suspended solids in the fly ash desilication mother liquor; process water and calcium hydroxide by liquid-solid The ratio is 3:1 and mixed evenly to prepare lime milk; the lime milk and fly ash desilication semen are mixed according to the calcium-silicon ratio (the CaO in the lime milk and the SiO in the fly ash desilication semen 2 The ratio of the amount of substance) is 0.95 and mixed evenly, moved into the causticization tank, and stirred at a stirring rate of 150r·min -1 1. Carry out causticizing reaction at a reaction temperature of 110°C for 1 hour; move the slurry after the causticizing reaction into a filter for solid-liquid separation to obtain solid-phase calcium silicate slag and liquid-phase sodium hydroxide solution; process water and calcium silicate The slag is mixed evenly according to the liquid...

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Abstract

The invention relates to the technical field of production of active calcium carbonate, in particular to a method for producing calcium carbonate by using a fly ash desilication mother solution. According to the method, the fly ash desilication mother solution serving as a raw material is subjected to causticization, water washing, dealkalization, water washing and drying to obtain a calcium silicate product. Compared with the prior art, the method has the characteristics of wide source of raw materials, strong raw material adaptability, uniform performance of the calcium silicate product, high whiteness, low impurity content and the like, the production cost is low, the energy consumption is low, and the environmental and economical benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of active calcium silicate preparation, and in particular relates to a method for producing calcium silicate by using fly ash desilication mother liquor, which is beneficial to the comprehensive utilization of solid waste and the treatment of secondary pollutants. Background technique [0002] In a broad sense, calcium silicate is a hydrate of calcium oxide and silicon dioxide, and its molecular formula can be expressed as CaO·mSiO 2 ·nH 2 O. It is suitable for the insulation of steel, petrochemical, ceramics, glass, cement, external wall and various furnaces, as well as the thermal insulation of electric power, machinery, electronics, shipbuilding and other industries. [0003] Active calcium silicate, also known as highly dispersed calcium silicate, is non-toxic and tasteless, insoluble in water, alcohol and alkali, soluble in acid, has very fine particle size, large specific surface area, strong reinfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24
Inventor 李会泉李少鹏李勇辉马艳丽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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