CN102363931A - Method for improving solid content of non-wood pulp black liquor - Google Patents
Method for improving solid content of non-wood pulp black liquor Download PDFInfo
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- CN102363931A CN102363931A CN2011103380070A CN201110338007A CN102363931A CN 102363931 A CN102363931 A CN 102363931A CN 2011103380070 A CN2011103380070 A CN 2011103380070A CN 201110338007 A CN201110338007 A CN 201110338007A CN 102363931 A CN102363931 A CN 102363931A
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- black liquor
- wood pulp
- solid content
- pulp black
- pulp
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Abstract
The invention discloses a method for improving solid content of non-wood pulp black liquor. The method comprises the following steps of: adding an aluminum salt into the evaporated and concentrated non-wood pulp (comprising bamboo, wheat straw, reed, sugarcane bagasse and the like) black liquor, and performing continuous stirring reaction for 30 to 40 minutes at the temperature of between 120 and 130 DEG C by using a stirrer, wherein the molar ratio of aluminum ions in the aluminum salt to SiO2 precipitated in the non-wood pulp black liquor is (0.8-1.0): 1. The aluminum salt is added in to the evaporated and concentrated non-wood pulp black liquor, so that the silicate and the aluminum salt in the black liquor undergo double hydrolysis reaction, the moisture content of the black liquor is reduced, and the solid content of the black liquor entering an alkali reclaiming combustion furnace is improved; and after the reaction is finished, the solid content of the black liquor is not less than 70 percent.
Description
Technical field
The invention belongs to the treatment process of the black liquor of pulp making of paper industry, be specifically related to a kind of method of sending into the non-wood pulp black liquor solid of alkali recovery combustion furnace content that improves with aluminium salt.
Background technology
China is main with non-wood-fiber (comprising straw pulp and bamboo pulp) papermaking, and non-wood pulp output accounts for 50%～60% of paper pulp total output, and the black liquor that produces during slurrying is produced is the topmost pollution sources of paper industry; Account for 90% of whole industrial pollution caused by paper manufacturing, contain cellulose, lignin and derivative thereof and the chemicals of a large amount of difficult degradations in the black liquor, oxygen demand is high; Be prone to cause the heavy damage of water pollution and ecological environment, handle black liquor through ripe alkali recovery technology (high-temp combustion) both at home and abroad at present, realize that chemicals and energy reclaim; This method requires the slurrying scale big; The black liquor amount is big, and the solid concentration height could satisfy the continuous operation of alkali recovery boiler, but not pulp black liquor viscosity is high; The black liquor solid content of sending into alkali recovery combustion furnace is merely 40%～50%, thereby causes non-wood pulp alkali to reclaim difficulty.It is low that the researcher sends into alkali recovery combustion furnace black liquor solid content to non-pulp black liquor, proposed many solutions, carried out useful exploration, alkali recovery combustion furnace black liquor solid content sent in raising played positive role.The method that is adopted has:
1, in black liquor, feeds carbon dioxide, promptly in non-pulp black liquor, feed carbon dioxide, the sodium metasilicate generation silicic acid deposition in the black liquor is separated out, reduce black liquor viscosity, thereby improve black liquor solid content.But this method subject matter is the CaSiO that produces
3Particle is very tiny, and because ventilation makes the CaSiO that separates out
3Particle is suspended in the solution, is difficult to deposition; The big molecule of the modified lignin that is dissolved in the alkali lye is also precipitated, reduced the calorific value of black liquor, reclaim normally carrying out of black-liquor combustion thereby have influence on alkali.
2, in non-pulp black liquor, add Ca (OH)
2, with the silicate reaction generation CaSiO in the black liquor
3Deposition can be removed silicate from black liquor, reduce black liquor viscosity, thereby has improved the solid content of black liquor.Consumption is big but weak point is medicine, general CaO: SiO
2Consumption is 2: 1～6: 1, and the white residue of generation is also many, has increased difficulty and expense that solid slag is handled, and superfluous lime also is unfavorable for black liquor vaporizing in addition, thereby this method is infeasible economically.
The above method all non-wood pulp of real solution is sent into the low problem of alkali recovery combustion furnace black liquor solid content.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of method that improves non-wood pulp black liquor solid content is provided.
For achieving the above object; The technical scheme that the present invention adopts is: add aluminium salt in the non-pulp black liquor after evaporation and concentration; Continue 30～40 minutes stirring reaction time at 120 ℃～130 ℃ with agitator, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor
2Mol ratio be 0.8～1.0: 1.
Described aluminium salt adds non-pulp black liquor with solid form.
Described aluminium salt adopts aluminum sulfate, aluminium oxide or aluminium hydroxide.
Add aluminium salt in the non-pulp black liquor of the present invention after evaporation and concentration; Make silicate, aluminium salt in the black liquor that two hydrolysis take place; Reduce the moisture in the black liquor, get into alkali recovery combustion furnace black liquor solid content thereby improve, reaction finishes back black liquor solid content and is not less than 70%.
The specific embodiment
The used black liquor of following examples is taken from non-wood pulp chemical recovery system concentrated black liquid groove, concentrated black liquid solid content 45%.
Embodiment 1: the non-pulp black liquor of getting after concentrating places container made of iron, heats non-pulp black liquor to 120 ℃ with electric furnace, then adds the aluminum sulfate solid, continues stirring reaction 30 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 0.8: 1.Reaction records non-wood pulp black liquor solid content 71% after finishing.
Embodiment 2: the non-pulp black liquor of getting after concentrating places container made of iron, heats non-pulp black liquor to 120 ℃ with electric furnace, then adds the aluminum sulfate solid, continues stirring reaction 30 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 0.9: 1.Reaction records non-wood pulp black liquor solid content 72% after finishing.
Embodiment 3: the non-pulp black liquor of getting after concentrating places container made of iron, heats non-pulp black liquor to 120 ℃ with electric furnace, then adds the aluminum sulfate solid, continues stirring reaction 30 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 1.0: 1.Reaction records non-wood pulp black liquor solid content 74% after finishing.
Embodiment 4: the non-pulp black liquor of getting after concentrating places container made of iron, heats non-pulp black liquor to 128 ℃ with electric furnace, then adds the aluminium oxide solid, continues stirring reaction 40 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 0.8: 1.Reaction records non-wood pulp black liquor solid content 72% after finishing.
Embodiment 5: the non-pulp black liquor of getting after concentrating places container made of iron; Heat non-pulp black liquor to 123 ℃ with electric furnace; Then add the aluminium hydroxide solid, continue stirring reaction 35 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 0.8: 1.Reaction records non-wood pulp black liquor solid content 73% after finishing.
Embodiment 6: the non-pulp black liquor of getting after concentrating places container made of iron, heats non-pulp black liquor to 130 ℃ with electric furnace, then adds the aluminum sulfate solid, continues stirring reaction 30 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 0.8: 1.Reaction records non-wood pulp black liquor solid content 76% after finishing.
Embodiment 7: the non-pulp black liquor of getting after concentrating places container made of iron, heats non-pulp black liquor to 125 ℃ with electric furnace, then adds the aluminum sulfate solid, continues stirring reaction 30 minutes, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor with agitator
2Mol ratio be 0.8: 1.Reaction records non-wood pulp black liquor solid content 74% after finishing.
Claims (3)
1. method that improves non-wood pulp black liquor solid content; It is characterized in that: add aluminium salt in the non-pulp black liquor after evaporation and concentration; Continue 30～40 minutes stirring reaction time at 120 ℃～130 ℃ with agitator, the SiO that wherein precipitates in aluminium ion in the aluminium salt and the non-pulp black liquor
2Mol ratio be 0.8～1.0: 1.
2. the method for the non-wood pulp black liquor solid of raising according to claim 1 content, it is characterized in that: described aluminium salt adds non-pulp black liquor with solid form.
3. the method for the non-wood pulp black liquor solid of raising according to claim 1 content is characterized in that: described aluminium salt adopts aluminum sulfate, aluminium oxide or aluminium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103380070A CN102363931A (en) | 2011-10-31 | 2011-10-31 | Method for improving solid content of non-wood pulp black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103380070A CN102363931A (en) | 2011-10-31 | 2011-10-31 | Method for improving solid content of non-wood pulp black liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102363931A true CN102363931A (en) | 2012-02-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103380070A Pending CN102363931A (en) | 2011-10-31 | 2011-10-31 | Method for improving solid content of non-wood pulp black liquor |
Country Status (1)
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| CN (1) | CN102363931A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452396A (en) * | 2014-10-23 | 2015-03-25 | 上海交通大学 | Efficient black liquor treatment agent as well as preparation method and application of efficient black liquor treatment agent |
| CN115652676A (en) * | 2022-11-17 | 2023-01-31 | 陕西科技大学 | Green liquor desilicication process preposed in desilicication process |
-
2011
- 2011-10-31 CN CN2011103380070A patent/CN102363931A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 徐永建 等: "抑制硅转移的非木材原料蒸煮新工艺及机理研究进展", 《中国造纸》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452396A (en) * | 2014-10-23 | 2015-03-25 | 上海交通大学 | Efficient black liquor treatment agent as well as preparation method and application of efficient black liquor treatment agent |
| CN115652676A (en) * | 2022-11-17 | 2023-01-31 | 陕西科技大学 | Green liquor desilicication process preposed in desilicication process |
| CN115652676B (en) * | 2022-11-17 | 2023-09-26 | 陕西科技大学 | Green liquid silicon removal process for pre-stage silicon removal process |
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Application publication date: 20120229 |