CN104107832A - Treatment method of white mud industrial waste of pulp mill - Google Patents
Treatment method of white mud industrial waste of pulp mill Download PDFInfo
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- CN104107832A CN104107832A CN201410317174.0A CN201410317174A CN104107832A CN 104107832 A CN104107832 A CN 104107832A CN 201410317174 A CN201410317174 A CN 201410317174A CN 104107832 A CN104107832 A CN 104107832A
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- white clay
- slag
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Abstract
The invention relates to the technical field of industrial waste treatment, and particularly relates to a treatment method of white mud industrial waste of a pulp mill. The method comprises the following steps: feeding carbide slag into a slaker slag elevator for a causticization reaction with Na2CO3; after the reaction, flushing the product with industrial wastewater on a folder to make NaOH residue in the reaction product enter a collection tank; and uniformly stirring the flushed reaction product and white mud, and performing suction filtration on the mixture on a pre-hanger till the moisture of the mixture is less than or equal to 30% to obtain white mud residue and dilute white liquid, wherein the moisture of the white mud residue is below 30%, the content of calcium carbonate in the white mud residue is over 92%, and the residual alkali in the white mud residue is below 1%. After the treatment, white mud and carbide slag can be used for neutralizing 30% waste acid (sulfur acid) in a titanium dioxide factory, the problems that white mud and carbide slag are stacked and cannot be utilized efficiently are fundamentally solved, and a new treatment process is formed to realize comprehensive utilization and turn harm into good and waste into wealth.
Description
Technical field
The invention belongs to industrial waste residue disposal technical field, relate in particular to the processing method of the white clay industrial residue of a kind of pulp mill alkali recycle section generation.
Background technology
Pulp and paper making can produce a large amount of causticization white claies and (also claim paper white sludge in alkali recovery process, main component is calcium carbonate), white clay moisture large (40-60%), calcium carbonate content extremely unstable (75-90%), residual a small amount of alkali (NaOH) (1-2%), store and stack difficult, the serious waste residue of environmental pollution.The causticization white clay that the timber of take is raw material, some external and domestic large-scale paper mills are all to adopt limekiln calcination method, make white slime as recycling, produce quick lime again, in causticization, recycle.The paper pulp papermaking enterprise that the non-wood-fiber of take is raw material, because the silicone content of white clay is high, if reclaiming, recycles, certainly will aggravate the silicon interference that alkali reclaims, causing alkali to reclaim cannot normally move, so white clay can not get dealing carefully with all the time, or draw to fill out to cheat and pave the way, or directly enter rivers, caused environmental pollution, must pay huge charges for disposing pollutants simultaneously and use.Along with the reinforcement day by day of efforts at environmental protection, paper white sludge is administered just becomes many enterprises difficult problem in the urgent need to address in recent years.The comprehensive reutilization of white clay is mainly for the production of building building cement at present, but can only carry out wet production because white clay moisture is high, and the energy consumption of unit product of wet-process cement exceeds 2093 ~ 2930kj/kg grog than dry technology for production, do not met cement industry developing direction.Because cement energy consumption of unit product is high, its production cost does not have market competition advantage, and normal condition is generally wanted distress sale.The a lot of enterprises of paper industry all take expropriation of land to stack or the measure of landfill, and taken over the land for use high cost and the difficult impact of expropriation of land partly face cannot deal carefully with the development problem that restricts main business because of waste residue.
Carbide slag is that the waste residue that calcium hydroxide is main component of take after acetylene gas is obtained in calcium carbide hydrolysis.Press knowhow, 1 ton of PVC product of every production consumes 1.5～1.6 tons, calcium carbide, and calcium carbide simultaneously per ton produces 1.2 tons of carbide slags (butt), and carbide slag water content is by 90%, and 1 ton of PVC product of so every production, discharges approximately 20 tons of carbide slag slurries.Carbide slag is through further dehydration, and its moisture content still reaches 40%～50%, is starchiness, and easy to leak pollutes road surface in transit, and long-term accumulation not only takies a large amount of soils, and there is to serious corrosion function in soil.And at present carbide slag mainly reclaims replace lime stone and is applied in and produces on clinker, this is the important channel of its comprehensive utilization, but because purity is high, do not need exploitation to be applicable to its production technology in cement clinker by carbide slag process, its requirement for equipment is higher than lime stone, caused the cement clinker quality preparing more general, and production cost is high.Want fundamentally to solve the stacking of carbide slag, efficiently utilize problem, for the comprehensive utilizating research of carbide slag, only have and seek technically to break through, seek new improvement technique, comprehensive utilization, turns harm into good, and turns waste into wealth.
By retrieval, obtain at present the progress of following white clay-carbide slag correlation technique:
Patent CN201210310163.0, a kind of white clay/carbide slag pulping device and technique, research unit Hangzhou sky blue environment-friendly engineering design Co., Ltd.This disclosure of the invention a kind of white clay/carbide slag pulping device, comprise supersonic wave cleaning machine (1), also comprise settlement separation tank (2) and homogenizer (4); A kind of white clay/carbide slag pulping process, white clay/carbide slag and water are mixed and made into white clay/carbide slag slurry, send in supersonic wave cleaning machine, through ultrasonic cavitation, remove black suspension impurity, stir layering makes bulky grain in white clay/carbide slag slurry be deposited on the bottom of supersonic wave cleaning machine simultaneously, bottom slurries are sent into circulation cutting in homogenizer, the slurries of supersonic wave cleaning machine middle and upper part are sent in settlement separation tank, stir layering, top is carried the slurries of black suspension impurity and after micro-pore-film filtration, is sent into sewage disposal system, and bottom slurries are as desulfurizing agent.
Patent CN88102948.3, utilizes the rich calcium industrial residue such as carbide slag, white clay and red mud to produce and increases calcium slag, inventor Fan Yonggen.This invention utilizes slag tap cyclone furnace to mix baking carbide residue, white clay, red mud or other rich calcium industrial residue, and coal and these blend ratios of mixing burning thing are 10: 1～10: 3.These calcium oxide contents of mixing burning thing generally all approach lime stone, have the effect of mixing scoria lime stone.If before mixing burning, these moistures of mixing burning thing are excessive, should dewater, make it not hinder and transmit and boiler combustion, its concrete production procedure is as follows: coal+mix burning thing → travelling belt → disintegrating machine → run coal bin → grater → thick, fine separator → Pulverized Coal Bin → batcher → boiler cyclone combustion chamber.
Patent CN201310047588.1, the autoclaved lime-sand brick that the industrial residue of take is raw material, Liuzhou Yu Hua Science and Technology Ltd. of research institution.This disclosure of the invention a kind ofly take the autoclaved lime-sand brick that industrial residue is raw material, to be made by the raw material of following weight portion: 80～90 parts of grain slags, 40～60 parts, hair sand, 30～40 parts, flyash, 25～35 parts of carbide slags, 1～3 part of chimney white clay, the CaO mass content > 55% in carbide slag wherein, carbide slag moisture content < 15%.Autoclaved lime-sand brick prepared by the present invention, mean compressive strength more than 17.30MPa, average rupture strength more than 3.69MPa, after freezing-thawing test mean compressive strength more than 12.10MPa, the loss rate 0.5～0.9% of monolithic brick.
Above technology is mainly that industrial residue white clay or carbide slag are processed in processing, production for products such as desulfurizing agent, increasing calcium powder, Dinas brickes, there are no processing about direct comprehensive utilization white clay and carbide slag, obtain after processing highly containing calcium carbonate slag, the spent acid (sulfuric acid) of doing its 30% concentration of neutralization for titanium powder plant is used.
Summary of the invention
The object of the invention is the industrial residue discharging for existing pulp mill alkali recycle section---white clay due to moisture large (40-60%), calcium carbonate content extremely unstable (75-90%), residual fraction alkali (NaOH) (1-2%), it can not directly be fully utilized, and store stacking difficulty, cause environmental pollution serious problems, the processing method of the white clay industrial residue of a kind of paper mill alkali recycle section generation is provided, the stacking that solves white clay, carbide slag is difficult, can not efficiently utilize problem, form new improvement technique, comprehensive utilization, turn harm into good, turn waste into wealth.
Technical scheme of the present invention is as follows:
A processing method for pulp mill's white clay industrial residue, delivers to carbide slag in slaker slag extracting machine and Na
2cO
3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, after product after flushing and white clay stir, be placed in pre-on-hook, carry out suction filtration make water divide≤30%, after suction filtration, obtain clay-slag and rare white liquid.
As a further improvement on the present invention, described white clay is the industrial residue of paper mill discharge.Especially the industrial residue that alkali recycle section in paper mill discharges.
As a further improvement on the present invention, described clay-slag moisture is below 30%, and calcium carbonate content is more than 92%, and residual alkali is below 1%.
As a further improvement on the present invention, described carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis)
2content is 90%-97%.
As a further improvement on the present invention, described industrial wastewater is the faintly acid waste water of paper pulp papermaking factory discharge.
As a further improvement on the present invention, its water content of product after described flushing remains on 65 ~ 75%.
As a further improvement on the present invention, the product after described flushing and white clay carry out mix and blend according to volume ratio 1L:1 ~ 3L.
Principle of the present invention is: traditional handicraft is used quick lime, adds water and change Ca(OH after fragmentation)
2deliver to slaker slag extracting machine and Na
2cO
3reaction, but due to quick lime in internal cause temperature field, limekiln unstable its CaO content that makes very unstable, thereby make the CaCO of white clay
3content is also unstable, and normal containing impurity such as Mg, Si, Al, Fe in lime, thereby makes CaCO in the white clay after recycling
3on the low side.The present invention adopts carbide slag to substitute quick lime, its purity higher (Ca(OH)
2content 93-97%), thus make Ca C O in white clay
3stable content and content higher (95% left and right), utilize causticizing reaction formula:
Ca(OH)
2+ Na
2cO
3=CaCO
3↓+2NaOH, after carbide slag and sodium carbonate are reacted, product is placed on folding band machine and rinses, and makes to remain in CaCO
3in NaOH enter feeder, and alkali (NaOH) is reclaimed, residual alkali content in white clay is reduced, the product after flushing is the CaCO of moisture content 70%
3, calcium carbonate and white clay are uniformly mixed and are placed in pre-on-hook moisture after suction filtration and can be reduced to below 30%.
The present invention has produced following good result:
(1) by the treatment process to traditional white clay, improve, the technique after improvement has increased folding band machine, on folding band machine, rinses, and makes to remain in CaCO
3in NaOH enter feeder, make the content that has reduced residual alkali in white clay; Technique after improvement has increased pre-on-hook, and the white clay moisture after suction filtration hanging in advance on pre-hung machine can be reduced to 30%; Adopt carbide slag to substitute quick lime, its purity higher (Ca(OH)
2content 93-97%), thus make Ca C O in white clay
3stable content and content higher (95% left and right), after processing, white clay and carbide slag can be used for spent acid (sulfuric acid) use that titanium powder plant is done its 30% concentration of neutralization, finally obtain clay-slag moisture below 30%, and calcium carbonate content is more than 92%, and residual alkali is below 1%.Fundamentally solve the stacking of white clay, carbide slag, can not efficiently utilize problem, form new improvement technique, comprehensive utilization, turns harm into good, and turns waste into wealth.
(2) remarkable in economical benefits (take to produce 80000 tons of paper pulp per year be example, 50,000 tons of year discharge white claies).Use before the technology of the present invention, white clay all will be transported outward stacking, if in 10 yuan/ton of freights, need every year to pay 500,000 yuan of freights, use after this technology, white clay can 20 yuan/ton be sold to titanium powder plant, can increase every year 1000000 yuan of incomes, positive minus tolerance quite brings benefits 1,500,000 yuan.Can exempt every year the stockyard maintenance expense of 200,000 yuan.Annual 1.5 ten thousand tons, the lime that uses, 400 yuan/ton of left and right of current lime market price, and carbide slag is as a kind of industrial residue, is 100 yuan of left and right at present to factory's unit price, annual cost-saved 3,000,000 yuan.In sum, produce the pulp mill of 50,000 tons per year and use this technology 5,000,000 yuan of left and right that can bring benefits.Another titanium powder plant is used the alternative 40,000 tons of limestone fines of this white clay, to factory in 100 price differences, cost-saved 4,000,000 yuan.
Accompanying drawing explanation
Fig. 1. the process flow figure of pulp mill of the present invention white clay industrial residue.
The specific embodiment
The processing method of pulp mill of the present invention white clay industrial residue is described below in conjunction with Fig. 1 and embodiment.
Embodiment 1
This enforcement raw material sources are as follows:
White clay is the industrial residue that paper mill alkali recycle section discharges.
Carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis)
2content is 93%-95%.
Industrial wastewater is the faintly acid waste water (containing a small amount of sulfuric acid) of paper pulp papermaking factory discharge.
Carbide slag is delivered in slaker slag extracting machine and Na
2cO
3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, its water content of product after flushing remains on 70% left and right, after product after flushing and white clay stir, product and white clay carry out mix and blend according to volume ratio 1L:3L, are placed in pre-on-hook, to carry out suction filtration to make moisture be 25-30%, obtain clay-slag and rare white liquid after suction filtration.
The clay-slag moisture obtaining after the present embodiment suction filtration is at 25-30%, and calcium carbonate content is 95.37%, residual alkali 0.57%, and concrete effect is in Table 1.
Embodiment 2
This enforcement raw material sources are as follows:
White clay is the industrial residue of pulp mill's discharge.
Carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis)
2content is 90%-93%.
Industrial wastewater is the faintly acid waste water of paper pulp papermaking factory discharge.
Carbide slag is delivered in slaker slag extracting machine and Na
2cO
3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, its water content of product after flushing remains on 65% left and right, after product after flushing and white clay stir, product and white clay carry out mix and blend according to volume ratio 1L:2.5L, are placed in pre-on-hook, to carry out suction filtration to make moisture be 25-30%, obtain clay-slag and rare white liquid after suction filtration.
The clay-slag moisture obtaining after the present embodiment suction filtration is at 25-30%, and calcium carbonate content is 97.48%, and residual alkali number is 0.62%, and concrete effect is in Table 1.
Embodiment 3
This enforcement raw material sources are as follows:
White clay is the industrial residue of paper mill discharge.
Carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis)
2content is 97%.
Industrial wastewater is the faintly acid waste water of paper pulp papermaking factory discharge.
Carbide slag is delivered in slaker slag extracting machine and Na
2cO
3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, its water content of product after flushing remains on 75% left and right, after product after flushing and white clay stir, product and white clay carry out mix and blend according to volume ratio 1L:1.5L, are placed in pre-on-hook, to carry out suction filtration to make moisture be 25-30%, obtain clay-slag and rare white liquid after suction filtration.
The clay-slag moisture obtaining after the present embodiment suction filtration is in 25-30% left and right, and calcium carbonate content is 98.15%, and residual alkali number is 0.53%, and concrete effect is in Table 1.
Embodiment 4
This enforcement raw material sources are as follows:
White clay is the industrial residue of pulp mill's discharge.
Carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis)
2content is 93% left and right.
Industrial wastewater is the faintly acid waste water of paper pulp papermaking factory discharge.
Carbide slag is delivered in slaker slag extracting machine and Na
2cO
3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, its water content of product after flushing remains on 70% left and right, after product after flushing and white clay stir, product and white clay carry out mix and blend according to volume ratio 1L:3L, are placed in pre-on-hook, to carry out suction filtration and make moisture 25-30%, obtain clay-slag and rare white liquid after suction filtration.
The clay-slag moisture obtaining after the present embodiment suction filtration is at 25-30%, and calcium carbonate content is more than 96.2%, and residual alkali is 0.45%, and concrete effect is in Table 1.
Embodiment 5
This enforcement raw material sources are as follows:
White clay is the industrial residue of paper mill discharge.
Carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis)
2content is 97% left and right.
Industrial wastewater is the faintly acid waste water of paper pulp papermaking factory discharge.
Carbide slag is delivered in slaker slag extracting machine and Na
2cO
3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, its water content of product after flushing remains on 75% left and right, after product after flushing and white clay stir, product and white clay carry out mix and blend according to volume ratio 1L:1L, are placed in pre-on-hook, to carry out suction filtration and make moisture 25-30%, obtain clay-slag and rare white liquid after suction filtration.
The clay-slag moisture obtaining after the present embodiment suction filtration is at 25-30%, and calcium carbonate content is 92.0%, residual alkali 0.6%, and concrete effect is in Table 1.
The above embodiment of the present invention scheme is only can not limit the present invention to explanation of the present invention, right wants P to point out the scope of processing method parameter of the present invention in asking, and the scope of parameter of the present invention is not pointed out in above-mentioned explanation, therefore, in the implication suitable with claims of the present invention and any change in scope, be all considered to be in the scope that is included in claims.
Table 1, prepare the performance overview of white clay
Claims (7)
- The processing method of 1.Yi Zhong pulp mill white clay industrial residue, is characterized in that, carbide slag is delivered in slaker slag extracting machine and Na 2cO 3there is causticizing reaction, having reacted afterproduct is placed on folding band machine and utilizes industrial wastewater to rinse, the NaOH that makes to remain in product enters feeder, after product after flushing and white clay stir, be placed in pre-on-hook, carry out suction filtration make water divide≤30%, after suction filtration, obtain clay-slag and rare white liquid.
- 2. the processing method of a kind of pulp mill according to claim 1 white clay industrial residue, is characterized in that, described white clay is the industrial residue of paper mill discharge.
- 3. the processing method of a kind of pulp mill according to claim 1 white clay industrial residue, is characterized in that, described clay-slag moisture is below 30%, and calcium carbonate content is more than 92%, and residual alkali is below 1%.
- 4. the processing method of a kind of pulp mill according to claim 1 white clay industrial residue, is characterized in that, described carbide slag is that the industrial residue producing after acetylene gas, its Ca(OH are obtained in calcium carbide hydrolysis) 2content is 90%-97%.
- 5. the processing method of a kind of pulp mill according to claim 1 white clay industrial residue, is characterized in that, described industrial wastewater is the faintly acid waste water of paper pulp papermaking factory discharge.
- 6. the processing method of a kind of pulp mill according to claim 1 white clay industrial residue, is characterized in that, its water content of the product after described flushing remains on 65 ~ 75%.
- 7. the processing method of a kind of pulp mill according to claim 1 white clay industrial residue, is characterized in that, the product after described flushing and white clay carry out mix and blend according to volume ratio 1L:1 ~ 3L.
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|---|---|---|---|
| CN201410317174.0A CN104107832B (en) | 2014-07-04 | 2014-07-04 | A kind of processing method of pulp mill white clay industrial residue |
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|---|---|---|---|
| CN201410317174.0A CN104107832B (en) | 2014-07-04 | 2014-07-04 | A kind of processing method of pulp mill white clay industrial residue |
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| CN104107832B CN104107832B (en) | 2016-09-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107662934A (en) * | 2017-10-19 | 2018-02-06 | 黑龙江科技大学 | A kind of method that applicable industry waste prepares hydrated calcium silicate and magnetic hydrotalcite |
| CN112973403A (en) * | 2021-03-31 | 2021-06-18 | 华北电力大学（保定） | Method for desulfurizing white mud |
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2014
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Patent Citations (6)
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| EP2438976A1 (en) * | 2006-03-10 | 2012-04-11 | Douglas C. Comrie | Carbon dioxide sequestration materials and processes |
| CN102424392A (en) * | 2011-09-11 | 2012-04-25 | 中国科学院过程工程研究所 | Method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107662934A (en) * | 2017-10-19 | 2018-02-06 | 黑龙江科技大学 | A kind of method that applicable industry waste prepares hydrated calcium silicate and magnetic hydrotalcite |
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| CN112973403A (en) * | 2021-03-31 | 2021-06-18 | 华北电力大学（保定） | Method for desulfurizing white mud |
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|---|---|
| CN104107832B (en) | 2016-09-07 |
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