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Application of calcium silicate as retention aiding intensifier in papermaking

A technology of calcium silicate and thickening agent, which is applied in the field of papermaking to achieve the effects of saving plant fiber consumption, high bulk thickness and increasing paper ash content

Inactive Publication Date: 2014-10-29
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in response to the paper industry's demand for high pulp retention and high paper bulk, there is no precedent for using calcium silicate as a retention and thickening agent for papermaking.

Method used

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  • Application of calcium silicate as retention aiding intensifier in papermaking
  • Application of calcium silicate as retention aiding intensifier in papermaking
  • Application of calcium silicate as retention aiding intensifier in papermaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of embodiment 1 active calcium silicate

[0027] 1), pre-desilication, the mixed solution composed of high-alumina fly ash and 20% sodium hydroxide solution (the mass ratio of sodium hydroxide and high-alumina fly ash is 0.5:1) is heated to 110°C. , introduce it into a pressure-resistant container for desiliconization reaction for 2h, and then carry out liquid-solid separation to obtain liquid-phase desiliconization liquid and solid-phase fly ash filter cake. High aluminum fly ash; alumina mass content in high aluminum fly ash is higher than 40%;

[0028] 2), the preparation of active calcium silicate, comprises the following steps: a, in step 1), in the desiliconization liquid, add lime milk to react, the available calcium oxide concentration in the lime milk is 150g / L, and in the available calcium oxide and the filtrate, SiO 2 The molar ratio is 1, the reaction temperature is 80 ° C, and the reaction time is 60 min, and the filter is filtered to obta...

Embodiment 2

[0029] Example 2 Calcium silicate is used for paper making

[0030] 1. Experimental materials

[0031] Activated calcium silicate prepared in Example 1; commercial softwood pulp and broadleaf pulp; filler is talcum powder.

[0032] 2. Experimental method

[0033] (1) The active calcium silicate is fully mixed with water according to the solid content of 3%, and dispersed; the linear speed of the dispersing blade of the disperser is 6.5m / s, and the dispersion time is 30min; the dispersed calcium silicate dispersion is sieved through a 100-mesh sieve Sieve treatment, the slurry is ready for use;

[0034] (2) Soft-leaved pulp: the broad-leaved pulp is prepared according to the mass ratio of 3:7, wherein the beating degree of the soft-leaved pulp is 40°SR, and the beating degree of the broad-leaved pulp is 35°SR;

[0035] (3) adding papermaking filler talc and the slurry prepared in step (1) into the slurry prepared in step (2) simultaneously;

[0036] (4) Add other papermakin...

Embodiment 3

[0047] Example 3 Calcium silicate is used for paper making

[0048] 1. Experimental materials

[0049] Activated calcium silicate prepared in Example 1; commercial softwood pulp and broadleaf pulp; filler is talcum powder.

[0050] 2. Experimental method

[0051] (1) The active calcium silicate is fully mixed with water according to the solid content of 2%, and dispersed; the linear speed of the dispersing blade of the disperser is 5m / s, and the dispersion time is 25min; the dispersed calcium silicate dispersion is sieved through a 100-mesh sieve processing, the slurry is ready for use;

[0052] (2) Soft-leaved pulp: the broad-leaved pulp is prepared according to the mass ratio of 3:7, wherein the beating degree of the soft-leaved pulp is 40°SR, and the beating degree of the broad-leaved pulp is 35°SR;

[0053] (3) first adding the papermaking filler talc powder to the slurry prepared in step (2), and then adding the slurry prepared in step (1) to the slurry;

[0054] (4) ...

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Abstract

The invention discloses application of calcium silicate as a retention aiding intensifier in papermaking and belongs to the technical field of applications of calcium silicate in papermaking. According to the invention, calcium silicate is adopted to serve as the retention aiding intensifier for the papermaking to be applied to the papermaking, wherein calcium silicate is preferably active calcium silicate. An application method comprises the following steps: (1) mixing calcium silicate with water to obtain a dispersion liquid; sieving the dispersion liquid by a screen and taking the slurry for later use; (2) adding papermaking filler into paper pulp and adding the slurry obtained in the step (1); or simultaneously adding the slurry obtained in the step (1) and the papermaking filler into the paper pulp; and (3) adding other papermaking additives and carrying out papermaking according to conventional papermaking processes. Calcium silicate is adopted to serve as the retention aiding intensifier to be applied to the papermaking and the operation is simple; the paper ash content and bulk are obviously increased; the plant fiber using amount is saved and the production cost is reduced.

Description

technical field [0001] The invention relates to a new application of calcium silicate, in particular to the application of calcium silicate as a retention and thickening agent for papermaking in papermaking, and belongs to the technical field of application of calcium silicate in papermaking. Background technique [0002] Fly ash is a solid particulate matter produced during the combustion of coal in a boiler. The technology of using fly ash to prepare new silicate fillers has been realized through synergy and co-production technology. The new calcium silicate filler is a kind of porous honeycomb, which has the characteristics of softness, large specific surface area, high sedimentation volume, low relative density, low abrasion value and good whiteness stability. [0003] However, in view of the paper industry's demand for high pulp retention and high bulk paper, there is no precedent for using calcium silicate as a retention and thickening agent for papermaking so far. S...

Claims

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Application Information

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IPC IPC(8): D21H17/67D21H21/10D21H21/22
Inventor 王成海孙俊民张战军陈杨高志军魏晓芬徐鹏
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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