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Hydroxide synergy precipitating-silica pulping method

A technology of hydroxide and magnesium hydroxide, which is applied in the direction of pulping with inorganic alkali, adding inorganic compounds, pulping of cellulose raw materials, etc., can solve problems such as interference

Inactive Publication Date: 2009-09-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

4. The improvement of the black liquor extraction equipment, the improvement of the evaporation station, and the improvement of the combustion furnace have further improved the effect of alkali recovery, but the above methods have not solved the problem of silicon transfer from the source, and are still deeply troubled by "silicon interference"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: at first, wheat straw is cut into the wheat straw section of 25-30mm, and standard method measuring moisture is 6.28%, and ash is 6.13%. Then get 0.1% aluminum oxide, 0.2% magnesium hydroxide and 0.05% anthraquinone of wheat straw segment quality, add aluminum oxide, magnesium hydroxide and anthraquinone in the sodium hydroxide solution and stir to obtain a mixed solution; finally, Add the mixed solution to the wheat straw section, then add water to make the mass ratio of wheat straw to liquid 1:4, heat up from room temperature to 155°C, heat up for 60 minutes, keep warm for 30 minutes, and spray into the spray pot to obtain the slurry. Fine slurry yield 43.74%, KMnO4 value 12.70, slurry SiO 2 Content 2.13%, slurry ash 4.43%, black liquor pH 11.38, SiO2 content (to slurry) 1.28% in black liquor.

Embodiment 2

[0009] Embodiment 2: at first, wheat straw is cut into the wheat straw section of 25-30mm, and standard method measuring moisture is 6.28%, and ash is 6.13%. Get the aluminum oxide of wheat straw section quality 0.06%, the magnesium hydroxide of 0.5%, the calcium hydroxide of 0.5% and the anthraquinone of 0.05%, join aluminum oxide, magnesium hydroxide, calcium hydroxide and anthraquinone to the hydroxide Stir evenly in the sodium solution to obtain a mixed solution; finally, add the mixed solution to the wheat straw segment, then add water to make the mass ratio of wheat straw to liquid 1:5, heat up from room temperature to 160°C, heat up for 60 minutes, and keep warm for 30 minutes. Spray it into the spray pot to get the slurry. Fine slurry yield 44.84%, KMnO 4 Value 10.50, paste SiO 2 Content 3.34%, slurry ash 6.22%, black liquor pH 12.16, SiO in black liquor 2 Content (to slurry) 1.19%.

Embodiment 3

[0010] Embodiment 3: at first, wheat straw is cut into the wheat straw section of 25-30mm, and standard method measuring moisture is 6.28%, and ash is 6.13%. Get the aluminum oxide of wheat straw section quality 0.3%, the magnesium hydroxide of 0.3%, the calcium hydroxide of 1.5% and the anthraquinone of 0.05%, join aluminum oxide, magnesium hydroxide, calcium hydroxide and anthraquinone to the hydroxide Stir evenly in the sodium solution to obtain a mixed solution; finally, add the mixed solution to the wheat straw segment, then add water to make the mass ratio of wheat straw to liquid 1:6, heat up from room temperature to 165°C, heat up for 60 minutes, and keep warm for 30 minutes. Spray it into the spray pot to get the slurry. Fine slurry yield 44.68%, KMnO4 value 10.60, slurry SiO 2 Content 2.37%, slurry ash 4.74%, black liquor pH 12.10, SiO in black liquor 2 Content (to slurry) 2.07%.

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PUM

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Abstract

The invention relates to a hydroxide synergy precipitating-silica pulping method. Aluminum oxide, magnesium hydroxide, calcium hydroxide and anthraquinone are added into sodium hydroxide solution to obtain a mixed solution; the mixed solution is added into wheat straw segments and then water is added in the wheat straw segments, and the mixture is increased in temperature from the room temperature to 155-165 DEG C and preserved for 30 minutes; and pulp is obtained by blowing the mixture into a blowing pot. The invention is a method provided aiming at wheat straw steaming pumping by the conventional soda-anthraquinone method, i.e. the aluminum oxide, the magnesium hydroxide and the calcium hydroxide are added before steaming. Tests show that hydroxide permeates into material to react with silica cells among epidermal cells to generate a complex undissolved substance which surrounds the silica cells, restrains the transfer of silica in the silica cells to black liquor, simultaneously connects the epidermal cells, and covers protrusions on the edge of the epidermal cells; so that most of silaceous substances remains in the interior and on the surface of a fiber to complete the precipitating silica.

Description

technical field [0001] The invention belongs to a pulping method in the papermaking industry, and in particular relates to a pulping method in cooperation with hydroxide and silicon retention. Background technique [0002] Non-wood fiber papermaking raw material wheat straw is an important renewable fiber resource in my country. Especially in the context of the strengthening of environmental awareness and energy crisis awareness in today's society, it is very important to correctly understand the importance and position of wheat straw in my country's pulp and papermaking. necessary. Due to the special reasons of the non-wood fiber raw material itself, the hemicellulose content is higher than that of wood, there are more miscellaneous cells, the ash content is high, and the silica accounts for more than 60%, resulting in high viscosity of black liquor, low extraction rate, and low temperature entering the combustion section , white mud is difficult to recycle and other issues...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21H11/12D21H17/64D21H17/67D21H17/05
Inventor 徐永建李宣建潘刚王建陈斌
Owner SHAANXI UNIV OF SCI & TECH