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Preparation method of in-situ calcium silicate fiber pulp and calcium silicate high-filler pulp

A calcium silicate and pulp technology, applied in the field of filler filling, can solve the problems of low filler retention rate, high chemical consumption, poor binding force between calcium silicate and fiber, etc., achieving wide source of raw materials and improving bonding strength , the effect of low cost

Inactive Publication Date: 2015-09-02
DATANG INT HIGH ALUMINA COAL R & D CENT
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing fiber in-situ calcium silicate pulp, which solves the problem of poor bonding between calcium silicate and fiber in the prior art when calcium silicate and fiber are physically mixed and stirred for filling. Technical issues of low filler retention, high chemical consumption and high energy consumption during paper drying

Method used

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  • Preparation method of in-situ calcium silicate fiber pulp and calcium silicate high-filler pulp
  • Preparation method of in-situ calcium silicate fiber pulp and calcium silicate high-filler pulp

Examples

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Effect test

Embodiment 1

[0025] Add 20g of fly ash to 250g of sodium hydroxide solution with a concentration of 16%. At this time, the dry basis mass ratio of fly ash and sodium hydroxide is 0.50:1. After stirring, a slurry is formed, and the temperature of the slurry is raised to 120°C , desiliconization reaction under this condition for 2 hours, after the reaction, the desiliconization slurry was separated from the solid and liquid, and the separated desilication filtrate was finely filtered through a leaf filter to obtain a desiliconization solution, which was diluted to 0.123L. At this time, the SiO in the desiliconization solution 2 Concentration is 59.8g / L, it is used as the siliceous raw material of fiber in-situ synthesis calcium silicate, measures 160ml diluted desiliconization solution, and adds 20g absolute dry coniferous wood pulp fiber in the desilication solution that vector takes, fully After soaking and standing for 1 hour, use a beater to beat the pulp, and control the beating degree ...

Embodiment 2

[0032] Add 19g of fly ash to 180g concentration of 15% sodium hydroxide solution, form a slurry after stirring, the dry basis mass ratio of fly ash and sodium hydroxide is 0.70:1, the temperature of the slurry is raised to 130°C, Under these conditions, desiliconization takes 2.5 hours. After the reaction, the desiliconization slurry is subjected to solid-liquid separation, and the desilication filtrate after solid-liquid separation is finely filtered through a leaf filter to obtain a desiliconization liquid, which is diluted to 0.14 L, SiO in the desiliconization solution at this time 2 The concentration is 55g / L, measure 170ml of diluted desiliconization solution, add 20g of dry broad-leaved wood pulp fiber, fully soak and let it stand for 1 hour, then use a beater to beat, control the beating degree of pulp at 45°SR~55° In the SR, adjust the pulp concentration of the pulp solution to 2% after beating, add the lime emulsion with a concentration of 150g / L to the pulp solution...

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Abstract

The invention provides a preparation method of in-situ calcium silicate fiber pulp and calcium silicate high-filler pulp. The method comprises the following steps: adding coal ashes to a sodium hydroxide solution, and carrying out desilylation reaction to prepare a desilication liquid; burning limestone, and carrying out slaking reaction on the burnt limestone and water to prepare a lime milk; adding a fiber material to the desilication liquid, and carrying out defibering and pulping treatment, so as to prepare a pulp solution; and adding the lime milk into the pulp solution, and carrying out in-situ fiber hydrothermal synthesis reaction, so as to prepare the in-situ calcium silicate fiber pulp. According to the preparation method of the in-situ calcium silicate fiber pulp provided by the invention, the technical problems of low filler retention rate, relatively high chemical consumption and relatively high energy consumption in paper drying caused by relatively poor binding force of the calcium silicate and the fiber when the calcium silicate and the fiber are subjected to physical mixing, stirring and filling in the prior art are solved.

Description

technical field [0001] The invention relates to a filling technology, in particular to a method for preparing fiber in-situ calcium silicate pulp and calcium silicate high-filler pulp. Background technique [0002] my country is the world's largest coal-burning country. With the rapid development of the power industry, the annual discharge of fly ash from coal-fired power plants has increased sharply. It is estimated that by 2020, the output of fly ash will reach 500 million tons. Left and right, this has caused enormous pressure on my country's national economy and environmental protection. [0003] At present, paper is mainly composed of plant fibers and mineral fillers. Traditional mineral fillers such as heavy calcium, light calcium, and talcum powder, etc., but due to factors such as high density, small specific surface area, and difficulty in combining with fibers, traditional mineral fillers are in the pulp. The filling ratio is generally not more than 30%. Relevant e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/68C01B33/24
Inventor 孙俊民张战军徐鹏王成海魏晓芬陈杨
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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