Method for regulating growth of calcium carbonate crystal grains by using pulping black liquor lignin

A technology for pulping black liquor and particle growth, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult control of reaction conditions, high cost of organic matter sources, and complicated preparation process

Inactive Publication Date: 2013-12-11
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the current complex preparation process for preparing calcium carbonate crystal particles of specific shape and size, the high cost of organic matter sources, and the difficult control of reaction conditions, etc., and at the

Method used

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  • Method for regulating growth of calcium carbonate crystal grains by using pulping black liquor lignin
  • Method for regulating growth of calcium carbonate crystal grains by using pulping black liquor lignin
  • Method for regulating growth of calcium carbonate crystal grains by using pulping black liquor lignin

Examples

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Embodiment 1

[0022] 1) The kraft pulping method is used to cook spruce wood chips. The cooking conditions are as follows: the amount of alkali used is 22wt% (calculated as NaOH), the degree of sulfidation is 34wt%, the liquid ratio is 1:4, the maximum temperature is 175°C, the heating time is 90min, and the heat preservation After 3 hours, the resulting slurry was put into a canvas bag, and the slurry was rinsed with tap water to neutrality, and the collected rinse solution was the spruce pulping black liquor;

[0023] 2) Slowly titrate the coniferous wood pulping black liquor obtained in step 1) with a oxalic acid solution with a concentration of 20wt% to pH=3, vacuum filter the above black liquor, intercept and obtain solid lignin, wash with distilled water until neutral, Vacuum dry at 25°C for 24 hours to obtain dry solid lignin, and dissolve the obtained dry solid lignin with an acetone solution with a volume ratio of 3:1 to obtain a mixed solution containing lignin. After the solution ...

Embodiment 2

[0028] 1) The kraft pulping method is used to cook masson pine wood chips. The cooking conditions are as follows: the amount of alkali used is 26wt% (calculated as NaOH), the degree of sulfidation is 32wt%, the liquid ratio is 1:4, the maximum temperature is 170°C, the heating time is 90min, and the temperature is kept Time 3h, gained slurry is packed in the canvas bag, adopts tap water to wash slurry to neutrality, and the washing solution that collects is the masson pine pulping black liquor;

[0029] 2) Slowly titrate the coniferous wood pulping black liquor obtained in step 1) with a oxalic acid solution with a concentration of 20wt% to pH=3, vacuum filter the above black liquor, intercept and obtain solid lignin, wash with distilled water until neutral, Vacuum dry at 25°C for 24 hours to obtain dry solid lignin, and dissolve the obtained dry solid lignin with an acetone solution with a volume ratio of 3:1 to obtain a mixed solution containing lignin. After the solution is ...

Embodiment 3

[0034] 1) Using the kraft pulping method to cook larch wood chips, the cooking conditions are: the amount of alkali used is 30wt% (calculated as NaOH), the degree of sulfidation is 30wt%, the liquid ratio is 1:4, the maximum temperature is 165°C, the heating time is 90min, and the heat preservation Time 3h, the gained slurry is packed in the canvas bag, adopts tap water to wash the slurry to neutrality, and the washing solution that collects is larch pulping black liquor;

[0035] 2) Slowly titrate the coniferous wood pulping black liquor obtained in step 1) with a oxalic acid solution with a concentration of 20wt% to pH=3, vacuum filter the above black liquor, intercept and obtain solid lignin, wash with distilled water until neutral, Vacuum dry at 25°C for 24 hours to obtain dry solid lignin, and dissolve the obtained dry solid lignin with an acetone solution with a volume ratio of 3:1 to obtain a mixed solution containing lignin. After the solution is left to stand for strat...

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Abstract

The invention discloses a method for regulating growth of calcium carbonate crystal grains by using pulping black liquor lignin. According to the biological mineralization principle, by softwood pulping black liquor lignin as an organic matrix, the lignin concentration, system temperature, system pH value, crystallizing time and other technological parameters are changed and regulated to prepare calcium carbonate crystal grains with different shapes and sizes to satisfy the application demands of different technical fields. The technique disclosed by the invention is quick, efficient and environment-friendly; the softwood pulping black liquor lignin is introduced into the raw materials for preparing calcium carbonate crystal grains with different shapes and sizes as the organic regulation matrix, thereby sufficiently and reasonably utilizing the waste resources in paper making industry, and reducing the pollution load of the pulping black liquor onto the natural environment and the treatment cost of the paper making enterprise; and the prepared calcium carbonate crystal grains can be widely used in industries of paper making, rubber and the like, and has important environmental benefit and economic value.

Description

technical field [0001] The invention relates to a method for regulating the growth of calcium carbonate crystal particles by using organic matter, in particular to a method for regulating the growth of calcium carbonate crystal particles by using lignin from pulping black liquor, and belongs to the technical field of pulp and papermaking engineering. Background technique [0002] Calcium carbonate is one of the most abundant inorganic minerals on the earth. It has the advantages of low price, non-toxic, non-irritating, good color and high whiteness. It is widely used in papermaking, plastics, coatings, ceramics, cosmetics and other industrial fields. Calcium carbonate belongs to multi-type crystals, including calcite type, aragonite type and vaterite type. Ordinary calcium carbonate exists in the most stable calcite type. Crystal forms exist. In the ordinary carbonization process, because the surface energy of cubic calcium carbonate is low, it is the most stable in nature,...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 张勇姚菊明彭国华马东旭
Owner ZHEJIANG SCI-TECH UNIV
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