CN1986472A - Process of producing cement with papermaking white clay as material - Google Patents
Process of producing cement with papermaking white clay as material Download PDFInfo
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- CN1986472A CN1986472A CNA2006101241655A CN200610124165A CN1986472A CN 1986472 A CN1986472 A CN 1986472A CN A2006101241655 A CNA2006101241655 A CN A2006101241655A CN 200610124165 A CN200610124165 A CN 200610124165A CN 1986472 A CN1986472 A CN 1986472A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The process of producing cement with waste papermaking white clay as material includes filtering alkali recovered white fluid in a vacuum suction filter to obtain white clay slurry with water content lower than 30 %, drying through contacting with vertical cement kiln fume inside a fluidized bed drier to obtain alkali-eliminating white clay, and using the white clay as material mixed clay, gypsum, coal and other cement producing material in cement produce shop. The present invention obtains cement material, waste heat and purified cement kiln fume and is environment friendly.
Description
Technical field
The present invention relates to a kind of paper white sludge refuse processing method, particularly with a kind of novel process of paper-making pulping alkali recovery white slime as the Cement Production raw material.
Background technology
Bagasse pulp belongs to grass fiber slurrying, aspect the recovery of black liquor treatment alkali, because the existence of silicone content higher (generally about 10%) and soda salt in the straw pulp white clay, its recovery can not can be sintered into lime as pure wood pulp white clay and turn back to the digestion direct reuse.At present the papermaking enterprise in the whole nation is annual produces about 1,500,000 tons of white clay, and most enterprise treats white clay and still takes to transport outward landfill or directly emit.Once there was enterprise to use white clay and generated cement testing, but because white clay moisture height, white clay oven dry power consumption is big, makes white clay generate the cement loss of capital, just is forced to stop in the experimental phase.As time goes on the improving constantly of bagasse alkaline pulping production capacity, consequent white clay secondary pollution is outstanding day by day, has also wasted a large amount of lime carbonate resources simultaneously.
People have carried out some researchs to paper white sludge as the Cement Production raw material in recent years, for example " Chinese paper industry " 2003,24 (3) .-51-52 have reported that the technical process of " paper white sludge is used for putting into practice of manufacture of cement " that Fu Chen Si of its army of Nanning sugar industry limited-liability company benefit etc. is delivered is: paper white sludge-vacuum washery slag-pre-hanging vacuum filtering and dewatering machine-entrucking-other raw material raw mill-shaft kiln-grog-cement grinding mill-cement of the temporary bunker-warm air of white clay-rotary conveyor-dryer one lift-white clay storehouse; The technical requirements of its solution is: the white clay addition content is controlled at 8%～12% of raw material amount, and moisture was less than 40% before white clay entered dryer, required white clay to contain residual alkali less than 0.5% simultaneously, can adapt to like this to be applied to the dry method Vertical Kiln for Cement Production.Chinese patent: utilize rich calcium industrial residue production increasing calcium slag＜application numbers such as carbide slag, white clay and red mud〉88102948,＜applicant〉Fan Yonggen, disclose a kind of slag tap cyclone furnace in the hereditary official and mixed baking carbide residue, rich calcium industrial residue producing cement adulterants such as paper white sludge and refining alumina laterite increase the method for calcium slag, and it is 10: 1～10: 3 that coal and these are mixed the blended ratio of burning thing.Another part Chinese patent: modified ardealite＜application number〉02138088,＜applicant〉Sun Guoqing, Ling Yixin disclose a kind of phosphate fertilizer plant's waste phosphogypsum that utilizes, with other waste residue, waste liquid is Additive Production cement, the modified ardealite of cement setting retarder and cement intensifier and preparation thereof.Its main weight consists of: additive (in aluminium sulfate slag, alunite, plant ash, the swelling, 1,2 in the middle of liquid and waste slag produced, the white clay of slag, dickite, paper mill and alkali factory and the sepiolite or 3 kind) 10-30%, phosphogypsum 70-90%.Weight ratio 70-90% phosphogypsum and 10-30% additive are mixed, make modified ardealite in stacking at a certain temperature, if will become the ash concrete retardant after 8-48 hour the modified ardealite moulding drying of 30-100 ℃ of sultry processing, if sultry 8-24 hour modified ardealite through 600-900 ℃ of high-temperature calcination, can be become cement intensifier.The pollution problem of waste residues such as solution waste phosphogypsum, waste liquid.
Recognize from the above-mentioned open source literature that retrieves: utilize the paper mill white clay few for the report of raw material production cement, Nanning, the Nanning sugar industry limited-liability company that has only Guangxi, paper mill white clay instead of part Wingdale with oven dry, the white clay addition content is controlled at 8%～12% of raw material amount, is used for the production of dry method shaft kiln cement.88102948,02,138,088 two parts of patent documentations are disclosed just mentions wherein a kind of as additive of white clay, does not mention the pre-treating process of white clay.And also there is the extra heat energy that adds of needs in the method for open source literature introduction, do not meet enterprise and makes full use of the purpose that the used heat waste residue reduces production cost.
Summary of the invention
The objective of the invention is will be in comprehensive utilization paper-making pulping alkali recovery white slime in the lime carbonate resource, cut down the consumption of energy, make refuse can become useful resource, both can reduce the quantity discharged of pollutent, can obtain the new technology of part of my profit again, can effectively utilize the white mud calcium carbonate resource, less energy-consumption, high-quality cement.
The present invention is achieved in that
1. utilize the stack gas that has surplus heat of cement in vertical kiln discharging,, make the drying cost of white clay be lower than the Wingdale price by the dry white clay of efficient fluidized bed dryer.
2. the white clay key that influences cement quality is the residual alkali in the white clay, removes residual alkali in the exsiccant process.
3. the exploitation white clay is produced the cement of high index technical recipe, and the comprehensive organic efficiency of white mud calcium carbonate resource will reach more than 90%.
Specific embodiment is:
Alkali is reclaimed white liquid, and (containing the alkali weight percentage is: 0.3-0.5%) place vacuum suction filter to filter, make it obtain moisture 30% the white clay slurry that is lower than, transport to the cement mill material storage yard, arrive fluidized bed dryer by conveyor delivery, contact with cement in vertical kiln stack gas at fluidized bed dryer, because cement in vertical kiln stack gas contains carbonic acid gas, the sulfurous gas sour gas, as obtaining after the drying except that the white clay behind the alkali, deliver to raw material workshop, cement mill, with other clay, gypsum, coal, raw materials such as fluorite mix, and homogenizing is burnt till grog at shaft kiln, after cement grinding mill just can obtain construction cement.
Cement in vertical kiln flue gas outlet temperature of the present invention is generally 800-1100 ℃, the white clay slurry is 5-10 minute at the mean residence time of fluidized bed dryer, the white clay water content that obtains after the drying is 1%-3%%, alkali content can reduce to 0.1-0.3%, and the carbonic acid gas of flue gas outlet, sulfurous gas content of acid gas also reduce in a large number.
Outstanding substantive distinguishing features of the present invention and obvious improvement are:
1, made full use of the waste white clay in paper mill, alleviated the pollution hazard of white clay discharging, can also provide the lime carbonate resource for the cement mill.
2, make full use of and save the energy, a lot of in the past cement mill flue gas outlet heat energy all is not used and has wasted, the Jin Zhenqi, the Chen Ruqing that have only power machine institute of Wuhan Water Conservancy and Electric Power Univ are at " cement mill UTILIZATION OF VESIDUAL HEAT IN research " " energy-conservation " 2001 (3) .-6-9,47 mention warm fume afterheat electricity generating plan research in the cement mill, Jiaozhuo, also proposing the cement kiln fume afterheat directly utilizes scheme to mainly contain: (1) adds warm air to flue gas waste heat recovery by heat exchanger, to save furnace fuel; (2) will discharge flue gas recirculation is transmitted back in the kiln, save furnace fuel. the indirect utilization scheme mainly contains: (1) arranges people's waste heat boiler with flue gas, produce steam, can directly utilize steam thermal energy to satisfy the needs of industry and domestic heating, also can utilize the steam pushing turbine, to extraneous output mechanical energy or electric energy; (2) kiln is discharged flue gas and directly make a gift to someone in the internal combustion turbine, waste heat is converted into electric energy or mechanical energy.But this article is not mentioned the carbonic acid gas that can alleviate flue gas outlet, the technical scheme of sulfurous gas content of acid gas.So the present invention is used for the white clay slurry drying, obtain cement raw material on the one hand, utilized used heat on the other hand, also make and purified cement in vertical kiln stack gas, alleviated the acid waste gas contaminate environment, the dust of shaft kiln stack gas also is purified in this system, and contamination particle also reduces in a large number in the discharged flue gas.
Description of drawings
Fig. 1 is that white clay utilizes the cement in vertical kiln flue gas drying to remove the alkali process route chart.
Fig. 2 is the efficient sulfuration bed dryer device structure synoptic diagram of dry white clay.
Recognize from Fig. 1: alkali reclaims white liquid and places vacuum suction filter to filter; make it obtain the white clay slurry that water content is lower than 30% white clay; transport to the cement mill material storage yard with dump truck; arrive efficient fluidized bed dryer by conveyor delivery; contact with cement in vertical kiln stack gas at fluidized bed dryer; obtain after the drying except that the white clay behind the alkali; deliver to raw material workshop, cement mill; draw with vacuum fan from the top outlet of efficient fluidized bed dryer; through separation cyclone scrubber; further reclaim the white clay of fine particle, mix, deliver to raw material workshop, cement mill together with the coarse particles of efficient fluidized bed dryer bottom.
Among Fig. 2, efficient fluidized bed dryer one end top is provided with white clay inlet and exhanst gas outlet, and the other end is provided with white clay outlet and waste hot gas inlet.White clay seethes with waste hot gas at the fluidized bed dryer internal screw and contacts in opposite directions, absorbing the heat exsiccant simultaneously, absorb stack gas and contain carbonic acid gas, sulfurous gas sour gas, reduce the residual alkali content in the white clay, waste gas is extracted out through discharging from chimney behind the cyclonic separator separation white clay dust by vacuum fan.
Embodiment
Embodiment 1
Alkali is reclaimed white liquid, and (the alkalinity weight percentage is: 0.3-0.5%) place vacuum suction filter to filter; make the white clay slurry of its white clay that obtains water content 28-32%; transport to the cement mill material storage yard with dump truck; arrive efficient fluidized bed dryer by conveyor delivery; contact with cement in vertical kiln stack gas at fluidized bed dryer; cement in vertical kiln flue gas outlet temperature is generally 800-1100 ℃; the white clay slurry is 5-10 minute at the mean residence time of fluidized bed dryer; obtain after the drying except that the white clay behind the alkali; white clay white clay water content is 2%; alkali content can reduce to 0.2%; deliver to raw material workshop, cement mill; draw with vacuum fan from the top outlet of efficient fluidized bed dryer; through separation cyclone scrubber; further reclaim the white clay of fine particle; mix with the coarse particles of efficient fluidized bed dryer bottom; deliver to raw material workshop, cement mill together; with other clay; gypsum; coal; raw materials such as fluorite mix; homogenizing; burn till grog at shaft kiln; after cement grinding mill just can obtain construction cement.Material homogenizer, calcining, ball milling condition and Portland cement shaft kiln production technique and the equipment of (cement grinding mill adopts φ 2.4 * 8m raw mill, and shaft kiln adopts the tower machine shaft kiln of φ 3.0 * 10m, burns till back 2.4*8 cement grinding mill) manufacture of cement do not have any change.
Embodiment 2
Alkali is reclaimed white liquid, and (the alkalinity weight percentage is: 0.3-0.5%) place vacuum suction filter to filter; make the white clay slurry of its white clay that obtains water content 30-35%; transport to the cement mill material storage yard with dump truck; arrive efficient fluidized bed dryer by conveyor delivery; contact with cement in vertical kiln stack gas at fluidized bed dryer; cement in vertical kiln flue gas outlet temperature is generally 800-1100 ℃; the white clay slurry is 8-12 minute at the mean residence time of fluidized bed dryer; obtain after the drying except that the white clay behind the alkali; white clay white clay water content is 3%; alkali content can reduce to 0.2%; deliver to raw material workshop, cement mill; draw with vacuum fan from the top outlet of efficient fluidized bed dryer; through separation cyclone scrubber; further reclaim the white clay of fine particle; mix with the coarse particles of efficient fluidized bed dryer bottom; deliver to raw material workshop, cement mill together; with other clay; gypsum; coal; raw materials such as fluorite mix; homogenizing; burn till grog at shaft kiln, after cement grinding mill, (cement grinding mill adopts φ 2.4 * 8m raw mill; shaft kiln adopts the tower machine shaft kiln of φ 3.0 * 10m, burns till back 2.4*8 cement grinding mill) just can obtain construction cement.The material homogenizer of manufacture of cement, calcining, ball milling condition and Portland cement shaft kiln production technique and equipment do not have any change.
Embodiment 3
Alkali is reclaimed white liquid, and (the alkalinity weight percentage is: 0.3-0.5%) place vacuum suction filter to filter; make the white clay slurry of its white clay that obtains water content 30-40%; transport to the cement mill material storage yard with dump truck; arrive efficient fluidized bed dryer by conveyor delivery; contact with cement in vertical kiln stack gas at fluidized bed dryer; cement in vertical kiln flue gas outlet temperature is generally 800-1100 ℃; the white clay slurry is 15-18 minute at the mean residence time of fluidized bed dryer; obtain after the drying except that the white clay behind the alkali; white clay white clay water content is 0.5%-3%; alkali content can reduce to 0.1%-0.2%; deliver to raw material workshop, cement mill; draw with vacuum fan from the top outlet of efficient fluidized bed dryer; through separation cyclone scrubber; further reclaim the white clay of fine particle; mix with the coarse particles of efficient fluidized bed dryer bottom; deliver to raw material workshop, cement mill together; with other clay; gypsum; coal; raw materials such as fluorite mix; homogenizing; burn till grog at shaft kiln, after cement grinding mill, (cement grinding mill adopts φ 2.4 * 8m raw mill; shaft kiln adopts the tower machine shaft kiln of φ 3.0 * 10m, burns till back 2.4*8 cement grinding mill) just can obtain construction cement.The material homogenizer of manufacture of cement, calcining, ball milling condition and Portland cement shaft kiln production technique and equipment do not have any change.
Claims (2)
1, a kind of method that adopts paper white sludge to make cement producting material, it is characterized in that: alkali reclaims white liquid and places vacuum suction filter to filter, obtain moisture 30% the white clay slurry that is lower than, transport to the cement mill material storage yard, be transported to fluidized bed dryer again, contact with cement in vertical kiln stack gas at fluidized bed dryer, obtain after the drying except that the white clay behind the alkali, deliver to raw material workshop, cement mill, mix, produce construction cement with other raw materials such as clay, gypsum, coal, fluorite.
2, employing paper white sludge according to claim 1 is made the method for cement producting material, it is characterized in that: described cement in vertical kiln flue gas outlet temperature is 800-1100 ℃, the white clay slurry is 5-10 minute at the mean residence time of fluidized bed dryer, and the white clay water content that obtains after the drying is 1%-3%%.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101241655A CN1986472A (en) | 2006-12-12 | 2006-12-12 | Process of producing cement with papermaking white clay as material |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101241655A CN1986472A (en) | 2006-12-12 | 2006-12-12 | Process of producing cement with papermaking white clay as material |
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| CN1986472A true CN1986472A (en) | 2007-06-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104843758A (en) * | 2015-04-27 | 2015-08-19 | 李广 | Dealkalization and purification method used in production of precipitated calcium carbonate |
| CN105036583A (en) * | 2015-08-11 | 2015-11-11 | 广西桂林金山化工有限责任公司 | Recycling utilization method of digestion waste slag |
| CN106288728A (en) * | 2016-08-08 | 2017-01-04 | 钮德明 | A kind of bagasse Pneumatic drying device |
| CN108996935A (en) * | 2017-06-06 | 2018-12-14 | 丹阳蓝思信息技术有限公司 | A method of cement additive is prepared by raw material of titanium gypsum |
| CN111348850A (en) * | 2018-12-21 | 2020-06-30 | 西南科技大学 | Hydraulic lime and production method thereof |
| CN113480203A (en) * | 2021-06-16 | 2021-10-08 | 福建三明南方水泥有限公司 | Process for producing cement clinker by using papermaking waste residues (white mud) |
-
2006
- 2006-12-12 CN CNA2006101241655A patent/CN1986472A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104843758A (en) * | 2015-04-27 | 2015-08-19 | 李广 | Dealkalization and purification method used in production of precipitated calcium carbonate |
| CN105036583A (en) * | 2015-08-11 | 2015-11-11 | 广西桂林金山化工有限责任公司 | Recycling utilization method of digestion waste slag |
| CN106288728A (en) * | 2016-08-08 | 2017-01-04 | 钮德明 | A kind of bagasse Pneumatic drying device |
| CN108996935A (en) * | 2017-06-06 | 2018-12-14 | 丹阳蓝思信息技术有限公司 | A method of cement additive is prepared by raw material of titanium gypsum |
| CN111348850A (en) * | 2018-12-21 | 2020-06-30 | 西南科技大学 | Hydraulic lime and production method thereof |
| CN113480203A (en) * | 2021-06-16 | 2021-10-08 | 福建三明南方水泥有限公司 | Process for producing cement clinker by using papermaking waste residues (white mud) |
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