CN1070022A - From black liquid, produce the method for dry powder - Google Patents
From black liquid, produce the method for dry powder Download PDFInfo
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- CN1070022A CN1070022A CN 92103483 CN92103483A CN1070022A CN 1070022 A CN1070022 A CN 1070022A CN 92103483 CN92103483 CN 92103483 CN 92103483 A CN92103483 A CN 92103483A CN 1070022 A CN1070022 A CN 1070022A
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- dry powder
- black liquid
- alkali lignin
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Abstract
A kind of method of producing dry powder from black liquid is that black liquid directly or after concentrating is filtered, and carries out the high temperature atomizing again and handles, and enters drying in the drying tower afterwards, and isolates alkali lignin dry powder by cyclone separator.This method can realize the non-pollution discharge of black liquid, and paper waste can be recycled, and the alkali lignin dry powder of producing can be used for technical fields such as oil exploitation, plant growing, glue.
Description
The present invention relates to a kind of method of from black liquid, producing dry powder, particularly from black liquid, directly produce the method for alkali lignin dry powder, belong to the comprehensive utilization technique of papermaking wastewater.
Black liquid, the black liquid of straw pulp paper-making in especially medium and small paper mill are important sources of environmental pollution, and black liquor nearly all is discharged in the environment, and annual charges for disposing pollutants from huge amount to relevant department that will turn over, cause very big economic loss to enterprise.And the more important thing is and make surrounding environment be subjected to severe contamination, directly have influence on the normal existence of people's healthy and animal and plant.The technical scheme that Chinese patent 88103016.3 discloses a kind of " administration of papermaking black liquid and application ", mainly be to separate out the aluminium lignin after black liquor is reacted with aluminum sulfate in reactive tank, and after flushing with clean water again with calcium hypochlorite or bleaching liquid reaction, mix, post precipitation becomes pasty state aluminium lignin.This technical matters complexity, cost is higher, also has discharging of waste liquid, does not reach the purpose of thorough improvement black liquor.And product is a pasty state, is difficult for packing, transportation and directly utilization.Adopt acidization from black liquor, to produce alkali lignin in addition in addition, but remaining waste liquid still need handle, can not reach non-pollution discharge.The employing multi-effect evaporator that also has concentrates black liquor, because the self-characteristic of black liquor, is difficult to reach Baume degrees greater than 50 concentrate, more can't obtain moisture content less than 15% alkali lignin dry powder.
Purpose of the present invention just is to overcome above-mentioned the deficiencies in the prior art, and provide a kind of black liquid that makes can disposable Separation of Solid and Liquid, thoroughly eliminate black liquor pollution, obtain alkali lignin dry powder simultaneously, and the method for from black liquid, producing alkali lignin dry powder that waste water is recycled.
The technical scheme that solves the foregoing invention purpose is: with black liquid directly or to be concentrated into Baume degrees be 3～30 to enter after filtering again and carry out the high temperature atomizing in the centrifugal atomizer and handle, enter in the drying tower dryly afterwards, isolate alkali lignin dry powder by cyclone separator again.Said black liquid consistency is 3～30 Baume degrees, and temperature is 20～100 ℃, and high temperature atomizing is to be 400～500 ℃ in temperature, and vaporization rate is to carry out under 2000 kilograms/hour the condition.
Accompanying drawing is a process chart of the present invention.
Embodiments of the present invention is described in detail below in conjunction with accompanying drawing.
Accompanying drawing shows whole technical process of the present invention.With concentration is that 3～30 Baume degrees, temperature are that 20～100 ℃ black liquid, especially alkaline straw pulp paper black liquid is concentrated into 30 Baume degrees to filter or directly enter centrifugal atomizer be that 400～500 ℃, boil-off rate are to carry out the high temperature atomizing under 2000 kilograms/hour the condition to handle in temperature.The black liquor that enters centrifugal atomizer is fully atomized and is carried out heat exchange with hot-air in the drying tower, the moisture content on solid content surface is vaporized effusion in the black liquor, and solid content falls into the drying tower bottom, and through pipeline send into cyclone separator separated from the gas after, can obtain the alkali lignin power-product, reach the solid-liquid first separation; And the steam that produces in atomization process enters in the collecting tank can be recycled (PH of this condensed water＞5.0) through condenser condenses Cheng Shuihou, and the small amount of exhaust gas emptying is arranged simultaneously.Under above-mentioned process conditions, can produce 10 tons in alkali lignin dry powder daily, the alkali lignin dry powder rate of recovery reaches 95%, water content in the dry powder＜15%.Hot-air in centrifugal atomizer and the drying tower can directly be supplied with by regenerative hot blast stove heating back, also can adopt other heat form.The EAT of drying tower is high more, and the dry powder productive rate is also high more.But solid content was easily by gelatinization or carbonization, so EAT is preferably grasped between 400～500 ℃ after temperature surpassed 500 ℃.The outlet temperature of drying tower crosses that low then air humidity is excessive, the dry powder moisture is increased and is difficult for fully being separated, and does not reach the product quality requirement, so the outlet wind-warm syndrome is advisable with 100～125 ℃.
The present invention is owing to adopt directly black liquor high temperature atomization drying and isolate the advanced technologies of alkali lignin power-product, and the black liquor that has thoroughly solved the discharging of medium and small paper mill has been realized non-pollution discharge to the severe contamination problem that environment causes.The alkali lignin dry powder of being produced is easy to packing, transportation and directly utilizes, and also can recycle in paper technology through condensed water, both provides great convenience to the user, has brought benefit to enterprise again.This method equipment needed thereby is simple, and cost of investment is lower, and is easy to operate, and environmental protection is had great significance, and also can improve the economic benefit in medium and small paper mill.
Claims (2)
1, a kind of method of from black liquid, producing dry powder, particularly from black liquid, produce the method for alkali lignin dry powder, it is characterized in that directly or be concentrated into to enter again after 3～30 Baume degrees filter and carry out the high temperature atomizing in the centrifugal atomizer and handle black liquid, enter drying in the drying tower afterwards, isolate alkali lignin dry powder by cyclone separator again.
2, the method for producing dry powder according to claim 1, it is characterized in that said black liquid consistency is 3～30 Baume degrees, black liquor temperature is 20～100 ℃, and high temperature atomizing is to be 400～500 ℃ in temperature, and boil-off rate is to carry out under 2000 kilograms/hour the condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103483 CN1070022A (en) | 1992-05-12 | 1992-05-12 | From black liquid, produce the method for dry powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103483 CN1070022A (en) | 1992-05-12 | 1992-05-12 | From black liquid, produce the method for dry powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1070022A true CN1070022A (en) | 1993-03-17 |
Family
ID=4940222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92103483 Pending CN1070022A (en) | 1992-05-12 | 1992-05-12 | From black liquid, produce the method for dry powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1070022A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075574C (en) * | 1999-07-15 | 2001-11-28 | 孙连超 | Process for preparing sodium xylose from paper-making black liquor and recovering caustic soda by dry combustion |
| CN103362008A (en) * | 2012-04-01 | 2013-10-23 | 中国科学院过程工程研究所 | Method for producing steam-exploded stalk eco-boards by utilizing alkali lignin as binder |
-
1992
- 1992-05-12 CN CN 92103483 patent/CN1070022A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075574C (en) * | 1999-07-15 | 2001-11-28 | 孙连超 | Process for preparing sodium xylose from paper-making black liquor and recovering caustic soda by dry combustion |
| CN103362008A (en) * | 2012-04-01 | 2013-10-23 | 中国科学院过程工程研究所 | Method for producing steam-exploded stalk eco-boards by utilizing alkali lignin as binder |
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| Date | Code | Title | Description |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |