CN103387253A - Carbonization process for white mud by using flue gas of alkali recovery boiler - Google Patents
Carbonization process for white mud by using flue gas of alkali recovery boiler Download PDFInfo
- Publication number
- CN103387253A CN103387253A CN2013101697649A CN201310169764A CN103387253A CN 103387253 A CN103387253 A CN 103387253A CN 2013101697649 A CN2013101697649 A CN 2013101697649A CN 201310169764 A CN201310169764 A CN 201310169764A CN 103387253 A CN103387253 A CN 103387253A
- Authority
- CN
- China
- Prior art keywords
- carbonization
- white clay
- flue gas
- alkali
- alkali recovery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Paper (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a carbonization and recovery process for white mud by using the flue gas of an alkali recovery boiler. The process comprises the following steps: delivering the flue gas of the alkali recovery boiler having undergone electrostatic precipitation to a boiler flue gas purification tower for purification; and then respectively delivering the purified flue gas of the alkali recovery boiler into a front deflocculating tank, the cavity of a deflocculating machine and a pipeline for carbonization of the white mud, wherein the pipeline is used for delivering the white mud to a finished product tank after deflocculating. According to the invention, the flue gas of the alkali recovery boiler is used as a carbon source, carbonization are carried out at three points, and the content of sulfur dioxide in the purified flue gas is no more than 30 ppm; the carbonization process for the white mud needs low carbonization cost and can well control the pH value of light calcium carbonate in the white mud.
Description
Technical field
The present invention relates to a kind of technique of utilizing the carbonization of alkali recovery furnace flue gas to reclaim white clay.
Background technology
China's alkali recovery white slime amount of giving money as a gift has reached 2,500,000 tons present every year, and most processing mode is to take to transport outward landfill or directly discharging, and the pollution of soil and water is become increasingly conspicuous.And the white Mud Recovered from Alkali Prepare Light Calcium Carbonate project belongs to the recycle of typically turning waste into wealth, and meets policy and the guiding of the aspects such as national cleaner production and recycling economy fully.From ecological aspect, the industrial scale of present China precipitation fine particle calcium carbonate is near 3,000,000 tons, and white clay fine particle calcium carbonate project can be alleviated exploitation scale and the speed of calcium carbonate mine resources effectively.From social aspect, alkali recovery white slime reclaims fine particle calcium carbonate can thoroughly eliminate the secondary pollution that white clay produces.From economic aspect, on present market, fine particle calcium carbonate is 700 yuan per ton, approximately 310 yuan per ton of the cost of white clay recovery fine particle calcium carbonate, and visible white clay fine particle calcium carbonate processed has significant cost advantage and profit margin.In these 310 yuan of costs, the cost of commodity purchased carbonic acid gas accounts for 46.5%, and the flue gas major ingredient of alkali recovery furnace discharging is carbonic acid gas, a small amount of sulfurous gas and alkali dirt particulate matter, atmosphere pollution, if replace the commodity carbonic acid gas to make carbon source after the alkali kiln gas is processed, both can further reduce white clay fine particle calcium carbonate cost processed, can reduce again the pollution that the discharging of alkali kiln gas produces.One ton of alkali of every production, produce approximately 3.5 tons of carbonic acid gas and 1.25 tons of white claies, and the about 200 kilograms of CO of per ton need of white clay fine particle calcium carbonate processed
2.
White clay fine particle calcium carbonate processed due to can decontamination, create profit, therefore more and more be subject to pulp mill's papermaking
It is bad that favor, but it is also few really white clay to be reclaimed the factory that the fine particle calcium carbonate quality does well, one of them factor are that pH value is controlled, and remaining calcium oxide carbonization is not thorough, affects paper and add and fill out and applying glue.
The method of controlling now white clay fine particle calcium carbonate pH value is: the commodity purchased carbonic acid gas, the white clay of separating after wadding sieves is put into the carbonization tank, and then pass into the carbonic acid gas of outsourcing, when the white clay pH value drops to 10.0, stop passing into carbonic acid gas, carbonization stops.
Summary of the invention
The object of the present invention is to provide a kind of alkali kiln gas that utilizes to do carbon source, the carbonization cost is low, and the technique of the carbonization white clay of fine control white clay fine particle calcium carbonate pH value.
The technical solution used in the present invention is: a kind of technique of utilizing the carbonization of alkali recovery furnace flue gas to reclaim white clay is characterized in that: comprise the steps:
1. with induced draft fan, the alkali recovery furnace stack gas after electrostatic precipitation is drawn, bleed ports is located at the horizontal flue of alkali recovery furnace;
The alkali kiln gas of 2. drawing is delivered to alkali kiln gas scavenging tower and is purified, and is washed to SO
2Below content 30ppm;
3. will separate the white clay concentration adjustment to 16%-20% of groove before wadding, the alkali kiln gas that has purified is delivered to respectively and is separated groove before wadding, cracking flossing machine thoracic cavity and Xie Xuhou and send the interior and white clay of the pipeline of pan tank to carry out carbonization; The carbonization terminal pH value of wherein separating the front groove white clay of wadding is 10.0, when before the solution wadding, groove white clay pH value drops to 10.0, closes and separates the front groove flue gas air intake valve of wadding a quilt with cotton; The carbonization terminal pH value of pan tank finished product white clay is 9.5, when in pan tank, the white clay pH value drops to 9.5, closes flue gas and enters the interior valve of pan tank preceding pipeline.
The washing water of step of the present invention in 2. are that the Xun ring uses, and when the pH value of washing water rises to 9.0, deliver to weak white liquor storage, and Xun ring tank reloads washing water.
Described carbonization pressure is 2.0-4.0kg/cm
2, carbonization temperature is 35 ℃-45 ℃.
During described cracking flossing machine thoracic cavity carbonization, flue gas and white clay are all from the cracking flossing machine bottom feed.
Flue gas flow size of the present invention can be regulated, and the carbonization of whole white clay is intermittent carbonization, i.e. carbonization one groove is seen a groove off.
Because a white clay particle is gathered together by a lot of white clay small-particle waddings, only have the solution wadding through the white clay cracking flossing machine, these white clay small-particles could be separated one by one.The present invention is chosen in rear 3 of Xie Xuqian, Xie Xuzhong, solution wadding and carries out carbonization, can avoid white clay parcel calcium oxide, affect adding of paper and fill out with applying glue etc.
The present invention utilizes the alkali kiln gas to do carbon source, carbonization is dispersed at 3 carries out, and sulfur dioxide in flue gas content≤30ppm after purifying is the technique that a kind of carbonization cost is low, reach the carbonization white clay of fine control white clay fine particle calcium carbonate pH value.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and specific examples:
Example of the present invention adopts the technical process described in Fig. 1:
1, the alkali kiln gas purifies:
Open induced draft fan alkali kiln gas scavenging tower is drawn, delivered to the alkali kiln gas from alkali stove horizontal flue, open simultaneously Xun ring water pump, the alkali kiln gas enters from the scavenging tower bottom, washing water down spray from tower top.Alkali kiln gas after spray washing is regulated pressure to 2.0-4.0kg/cm
2, after minutes three branch roads are delivered to respectively groove, cracking flossing machine thoracic cavity before cracking flossing machine and separated wadding, white clay is delivered in the pipeline of pan tank and carries out carbonization.
2, white clay carbonization:
To separate the white clay concentration adjustment to 16%-20% of the front groove of wadding, temperature at this moment is about 35 ℃-45 ℃.The alkali kiln gas intake valve of opening three carbonization points starts carbonization.Observe the online pH value of separating the front groove of wadding and pan tank and count in carbonization process, when before the solution wadding, groove white clay pH value drops to 10.0, close and separate the front groove flue gas air intake valve of wadding a quilt with cotton; When in pan tank, the white clay pH value drops to 9.5, close flue gas and enter the interior valve of pan tank preceding pipeline.
Claims (4)
1. a technique of utilizing the carbonization of alkali recovery furnace flue gas to reclaim white clay, is characterized in that: comprise the steps:
1. with induced draft fan, the alkali recovery furnace stack gas after electrostatic precipitation is drawn, bleed ports is located at the horizontal flue of alkali recovery furnace;
The alkali kiln gas of 2. drawing is delivered to alkali kiln gas scavenging tower and is purified, and is washed to SO
2Below content 30ppm;
3. will separate the white clay concentration adjustment to 16%-20% of groove before wadding, the alkali kiln gas that has purified is delivered to respectively and is separated groove before wadding, cracking flossing machine thoracic cavity and Xie Xuhou and send the interior and white clay of the pipeline of pan tank to carry out carbonization; The carbonization terminal pH value of wherein separating the front groove white clay of wadding is 10.0; The carbonization terminal pH value of pan tank finished product white clay is 9.5.
2. the technique described according to claim 1 is characterized in that: the washing water of described step in 2. are that the Xun ring uses, and when the pH value of washing water rises to 9.0, deliver to weak white liquor storage, and Xun ring tank reloads washing water.
3. the technique described according to claim 1, it is characterized in that: described carbonization pressure is 2.0-4.0kg/cm
2, carbonization temperature is 35 ℃-45 ℃.
4. the technique described according to claim 1, it is characterized in that: during the carbonization of described cracking flossing machine thoracic cavity, flue gas and white clay are all from the cracking flossing machine bottom feed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101697649A CN103387253A (en) | 2013-05-10 | 2013-05-10 | Carbonization process for white mud by using flue gas of alkali recovery boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101697649A CN103387253A (en) | 2013-05-10 | 2013-05-10 | Carbonization process for white mud by using flue gas of alkali recovery boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103387253A true CN103387253A (en) | 2013-11-13 |
Family
ID=49531688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101697649A Pending CN103387253A (en) | 2013-05-10 | 2013-05-10 | Carbonization process for white mud by using flue gas of alkali recovery boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103387253A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109279637A (en) * | 2018-09-21 | 2019-01-29 | 岳阳林纸股份有限公司 | A kind of method of chemistry sulfate wood pulp alkali recovery white slime refining filler of calcium carbonate |
| CN110697753A (en) * | 2019-10-23 | 2020-01-17 | 王亚双 | Method for preparing high-concentration calcium carbonate slurry from alkali recovery white mud and recycling calcium carbonate slurry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101003383A (en) * | 2007-01-21 | 2007-07-25 | 岳阳纸业股份有限公司 | New technique for refining filler of calcium carbonate from lime mud |
| CN101186326A (en) * | 2007-11-23 | 2008-05-28 | 华泰集团有限公司 | Method for preparing calcium carbonate from reclaimed white mud of straw pulp production alkali |
-
2013
- 2013-05-10 CN CN2013101697649A patent/CN103387253A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101003383A (en) * | 2007-01-21 | 2007-07-25 | 岳阳纸业股份有限公司 | New technique for refining filler of calcium carbonate from lime mud |
| CN101186326A (en) * | 2007-11-23 | 2008-05-28 | 华泰集团有限公司 | Method for preparing calcium carbonate from reclaimed white mud of straw pulp production alkali |
Non-Patent Citations (2)
| Title |
|---|
| 宋克海等: "碱回收炉二氧化碳回用方案的研究与应用", 《造纸科学与技术》 * |
| 工业和信息部: "工业固体废物综合利用先进适用技术目录", 《中华人民共和国工业和信息化部节能与综合利用司》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109279637A (en) * | 2018-09-21 | 2019-01-29 | 岳阳林纸股份有限公司 | A kind of method of chemistry sulfate wood pulp alkali recovery white slime refining filler of calcium carbonate |
| CN110697753A (en) * | 2019-10-23 | 2020-01-17 | 王亚双 | Method for preparing high-concentration calcium carbonate slurry from alkali recovery white mud and recycling calcium carbonate slurry |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102677515B (en) | Process for preparing recovered pulp with high whiteness and high cleanliness | |
| CN103102053B (en) | Recycling method of papermaking sludge | |
| CN104498716B (en) | A kind of secondary lead smelting co-producing paper pulp technology of energy-conserving and environment-protective | |
| CN103523945A (en) | Clean production method of plant fiber product | |
| CN105714590A (en) | Method for separating lignin and hemicellulose from papermaking black liquor and recycling alkali liquor | |
| CN109095578A (en) | A kind of method of oxalate precipitation method recycling power plant desulfurization wastewater calcium and magnesium | |
| CN102134139A (en) | Comprehensive control process of black liquor | |
| CN104762478B (en) | The method reclaiming metal is produced based on pickling mud | |
| CN103466839A (en) | Ink wastewater treatment method | |
| CN1891841B (en) | Regenerative lead processing method and apparatus | |
| CN102161495A (en) | Method for recycling soda waste mud from soda plant | |
| CN104773885A (en) | Comprehensive treatment method of coking desulfurization waste liquid | |
| CN104671497B (en) | Realize straw pulping and paper-making and waste lead acid battery and regenerate the energy-conserving and environment-protective technique of two industrial symbiosis mutual benefits | |
| CN103387253A (en) | Carbonization process for white mud by using flue gas of alkali recovery boiler | |
| CN104190240A (en) | Method for reducing cost of limestone-gypsum wet desulfurization process | |
| CN101418527B (en) | Deinking process for waste paper | |
| CN104326498B (en) | Device utilizing high-temperature flue gas with high CO2 content to produce ultrafine active calcium powder and production method thereof | |
| CN100408918C (en) | Method for dealing with discharge liquid from paper, leather and dye printing industry using circulating fluidized combustion method | |
| CN103848882B (en) | A kind of turmeric saponin extracting method of non-waste-emission | |
| CN102586947A (en) | Method for producing inorganic fiber for papermaking by means of alkali recovery lime sludge of paper mill | |
| CN102041703B (en) | Process for removing silicon in green liquor of papermaking alkali recovery section by seeding | |
| CN103337440B (en) | A kind of useless fluorescent lamp material is separated sorting automatic manufacturing device and method | |
| CN114108352B (en) | Papermaking white mud pretreatment system and treatment method for wet desulphurization | |
| CN101830493A (en) | Method for processing waste salt slurry of calcined soda with sodium carbonate and sodium sulfate | |
| CN108906339A (en) | A kind of Floatation of Removal Carbon method of flyash |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131113 |