Method for lowering pH value of active calcium silicate

A technology of active calcium silicate and pH value, which is applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of reducing the pH value of highly alkaline active calcium silicate and high pH value of active calcium silicate, and achieves The effect of low production cost, improved utilization rate, and low energy and material consumption

Inactive Publication Date: 2011-09-21
INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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  • Application Information

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Problems solved by technology

But this process also has the problem of high pH value of active calcium silicate
There i

Method used

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  • Method for lowering pH value of active calcium silicate

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Embodiment 1

[0038] figure 1 It is a flowchart of the method for reducing the pH value of active calcium silicate provided by Example 1 of the present invention. The active calcium silicate to be treated in this embodiment is the active calcium silicate co-produced by extracting alumina from high-alumina fly ash. Specific steps are as follows:

[0039] (1) Na of the active calcium silicate to be treated is detected 2 O mass percentage content is 3.1%, and the mass percentage content of water is 50%, and pH value is 13.7;

[0040] (2) Preparation of milk of lime: CaO and water are mixed in a ratio of 1:4 by mass, and the stirring time is 1 hour, and then the slag removal process is carried out, and the impurities at the bottom are removed to obtain milk of lime; the slag removal process here is Refers to the slag removal treatment of lime milk: in the process of preparing lime milk by adding water to the quicklime, since only active CaO in quicklime can react with water to form lime milk...

Embodiment 2

[0047] (1) Na of the active calcium silicate to be treated is detected 2 O mass percentage content is 1.8%, and the mass percentage content of water is 65%, and untreated calcium silicate pH is 13.2;

[0048] (2) Preparation of milk of lime: CaO and water are mixed in a ratio of 1:4 by mass, the stirring time is 1 hour, and then slag removal is carried out to remove impurities at the bottom to obtain milk of lime with higher purity;

[0049] (3) Slowly add milk of lime and water to the active calcium silicate to be treated and stir evenly. The mass ratio of effective calcium in active calcium silicate to milk of lime is 33:1, the reaction temperature is 90°C, and the reaction time is 1.0h , after filtration and separation, two reverse washes were carried out, and the Na in the active calcium silicate 2 O content reduced to 0.42%;

[0050] (4) Prepare a sulfuric acid solution with a mass fraction of 2 / 1000. Under normal temperature conditions, add the active calcium silicate...

Embodiment 3

[0055] (1) Na of the active calcium silicate to be treated is detected 2 The mass percent content of O is 0.7%, the mass percent content of water is 68%, and the pH of the untreated calcium silicate is 12.8.

[0056] (2) Prepare a sulfuric acid solution with a mass fraction of 2 / 1000. Under normal temperature conditions, add the active calcium silicate in step (1) into the dilute sulfuric acid solution, soak for 30 minutes after fully stirring, and the mass ratio of active calcium silicate to pure sulfuric acid is 26:1;

[0057] (3) Add saturated aluminum sulfate solution to the active calcium silicate in step (2), soak for 20min after fully stirring, and the mass ratio of active calcium silicate to solid aluminum sulfate is 30:1;

[0058] (4) Filter the active calcium silicate in step (3), wash the filter cake once with clear water, the ratio of the clear water washing liquid to the dry basis of active calcium silicate is 3:1, and finally obtain the active calcium silicate w...

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Abstract

The invention discloses a method for lowering the pH value of active calcium silicate. The method comprises the following steps of: adding lime milk to high-alkality active calcium silicate for dealkalization when the Na2O content (weight percent) in the high-alkality active calcium silicate is greater than or equal to 1%, and then carrying out acidification treatment; and directly carrying out acidification treatment on high-alkality active calcium silicate when the Na2O content (weight percent) in the high-alkality active calcium silicate is smaller than 1%. The invention overcomes the defects of the prior art, and realizes the advantages of wide raw material sources, low price, simple operation steps and low energy consumption. The pH value of high-alkality active calcium silicate treated by the method can be lowered to 8-10, thereby meeting the requirements on filler performance in the industries of plastic, rubber, paper making, paint and the like, and high-alkality active calcium silicate treated by the method can be used as a heat-insulation material.

Description

technical field [0001] The invention relates to active calcium silicate treatment technology, in particular to a method for reducing the pH value of active calcium silicate. Background technique [0002] The molecular formula of active calcium silicate can be expressed as: CaO·SiO 2 ·nH 2 O, non-toxic and tasteless, insoluble in water, alcohol and alkali, but easily soluble in strong acids, and has strong adsorption properties. Because of its fine particle size, high whiteness, low bulk density and true density, and good thermal insulation performance, this type of active calcium silicate can be used not only in the field of thermal insulation materials, but also as an additive widely used in rubber, plastic, Papermaking and coating fields. Active calcium silicate is usually hydrothermally synthesized from calcium sources such as quicklime and milk of lime and silicon sources such as sodium silicate solution, water glass, quartz sand and diatomaceous earth. However, calc...

Claims

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Application Information

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IPC IPC(8): C01B33/24
Inventor 张战军陈刚孙俊民张晓云张先奇霍奇志张国希许宏立
Owner INNER MONGOLIA DATANG INT RENEWABLE RESOURCES DEV
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