CN101391794A - Novel method for preparing light calcium carbonate by recovering solid white slime through alkaline pulping - Google Patents
Novel method for preparing light calcium carbonate by recovering solid white slime through alkaline pulping Download PDFInfo
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Abstract
The invention discloses a new method which uses paper industry alkali recovery solid white mud for preparing light calcium carbonate, comprising the following steps: green liquid purification treatment, quicklime handpicking, harsh reaction, carrying out handpicking and carbonation reaction on the white mud which is generated by the harsh reaction; simultaneously, washing purification is carried out on the waste gas containing CO2 which is discharged by a paper industry alkali furnace, and then the purified waste gas is conducted into a carbonation tower so as to react with the handpicked white mud; the slurry part which is generated from the carbonation reaction is prepared into slurry calcium carbonate products, and the rest part is prepared into powder light calcium carbonate products by dehydration and drying; and the powder products can be used in the industries such as rubber, plastics, paper and the painting thereof and the like. The method not only thoroughly solves the problem that the waste residue white mud which is generated by paper industry alkali recovery brings secondary pollution, but also solves the problem that the paper industry alkali furnace discharges waste gas; from the perspective of environmental protection, the invention has significant social benefits.
Description
One, technical field:
The present invention relates to the post-treating method of the waste that produces in the paper industry alkali recovery process, particularly relate to a kind of novel method of utilizing recovering solid white slime through alkaline pulping to prepare light calcium carbonate.
Two, background technology:
In recent years, though China's paper-making industry has had large development, " resource " and " environmental protection " became two big important factors of current restriction paper-making industry fast development.The primary pollution source that produces in the paper industry is the green liquor that produces in the pulping digestion process now, be processed into cooking technique as the green liquor that generally adopts, mostly adopt supporting alkali recovery process, by concentrating and burning the non-cellulose in the green liquor, xylogen are burnt, add unslaked lime (calcium oxide) by causticization again, the alkali lye of making is turned back to slurrying again be used for the boiling reuse.Though alkali reclaims the pollution problem that has solved the papermaking green liquor, alkali reclaims a large amount of alkaline scrap materials (white clay) that produce and has caused secondary pollution, and this white clay secondary pollution problem is that alkali reclaims the key subjects that must solve.
In present paper industry, alkali reclaims the treatment process that the white clay that produces mostly adopts discharging or landfill, has caused the serious problems of secondary pollution.Though the treatment process of white clay has calcination cycle to utilize method, chemistry system to fill out method and the washing system is filled out method, but have the following disadvantages: 1, calcination method mainly is applicable to wood pulp papermaking, but what China extensively adopted is the straw pulp fiber raw material, silicone content is higher in the green liquor, and silica removal is subjected to restrictions such as cost, technology, makes the green liquor clarification difficulty, white clay impure many, whiteness is low, the calcination cycle method is used and is difficult to realize, and the running cost height.2, adopt chemical method need add chemical assistant, cost is than higher, and can not be thoroughly with its lime mud treatment, and major part causes environmental pollution still by landfill disposal.3, WATER-WASHING METHOD is that operation is handled and filtered to the white clay that caustic room is discharged through several washing, carbonating, remove wherein most of impurity and residual alkali, being prepared into can be for the filler of papermaking application, this method once was applied among a small circle, but along with paper-making industry to improving constantly that paper product requires, can not satisfy papermaking with the lime carbonate of this simple process production and add the standard of filling out raw material.Because the pearl filler particle expansion that makes is poor, surface strength is low, fineness and whiteness do not reach requirement.Therefore, in view of above-mentioned various reasons, the mostly direct white clay that the causticization operation is produced of many papermaking producers is discharged outside the factory or is carried out landfill, causes environmental pollution once more.
In recent years, for the secondary pollution that the white clay that solves the alkali recovery process generation causes, many experts and producer had carried out big quantity research, and had obtained certain effect.At present, many bibliographical informations about this respect are also arranged.For example: 1, application number is 02113979.2, denomination of invention is technological process of recovering white clay to produce stuffing calcium carbonate, and this novel process comprises operations such as fusion groove, green liquor clarification, causticization, white liquid clarification, white clay be refining.2, application number is 200710034312.4, denomination of invention is new technique for refining filler of calcium carbonate from lime mud, this technology comprise get the raw materials ready, clarify washing, scalping, expansion separates wadding and carbonization, fine screen and finished product store.3, application number is 200710115131.4, denomination of invention is the method that the white clay that utilizes straw pulp alkali to reclaim prepares lime carbonate, this method may further comprise the steps: former green liquor clarification, add that flocculation agent precipitation, white clay are washed, a carbonization, sieve, the secondary carbonization, separate wadding and sieve, the carbon dioxide of this invention employing is technical grade CO
2
The present invention is on the basis of existing processing white clay technology, by certain technological improvement, studied and a kind ofly can solve the novel process of white clay secondary pollution fully, the white clay that this technology reclaim to produce alkali is as required partly made the slurry light calcium carbonate and is returned the paper mill and utilize again, rest part is made the powder light calcium carbonate and is used as other industry filler, can use for the paper mill, can be used as production marketing again.This technology has thoroughly solved the pollution problem of white clay, can promote the fast development of paper-making industry largely.
Three, content of the present invention:
The technical problem to be solved in the present invention provides a kind ofly can thoroughly solve the white clay pollution problem, utilize the solid white clay that produces in alkali furnace exhaust that paper industry produces and the paper industry alkali recovery process to prepare the novel method of light calcium carbonate.
Address the above problem, the technical solution used in the present invention is:
The invention provides a kind of novel method of utilizing caustic sludge from papermaking industry-white clay to prepare light calcium carbonate, described novel method comprises that green liquor purification processes process, unslaked lime are selected, causticizing reaction, white clay is selected and carburizing reagent, and its detailed step is as follows:
(1), green liquor purification processes process: in green liquor, add the stablizer be equivalent to green liquor volumetric concentration 10～20ppm and concentration and be 10% lime slurry, the add-on of lime slurry is 1 of green liquor flow～3 ‰, the green liquor flow is 20～40 cubic meters/hours, carry out mechanical filter with pump suction pressure filter or bag type filtering machine after stirring, the green liquor after the filtration imports storage tanks;
(2), unslaked lime is selected: unslaked lime with the vibratory screening apparatus processing of sieving, is removed cinder wherein, make in its unslaked lime less than 1 centimetre foreign matter content less than 3%, the purity of the back unslaked lime that sieves is that the content of calcium oxide reaches more than 85%;
(3), causticizing reaction: will carry out causticizing reaction in the green liquor after the adding of the unslaked lime after the selected purification, when carsticity stopped reaction greater than 88% time, the sodium hydroxide solution that generates uses in the paper industry again through conventional processing, carries out the white clay that produces selected;
(4), the refining process of white clay: with all or part of dissolving tank that enters of white clay of causticizing reaction generation, it is the slurry of 15～20 degree Beaume that thin up becomes concentration, white clay slurry after the dilution is filtered through 40～80 order vibratory screening apparatuss, filter back importingization slurry jar, filter through 120～200 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, then the white clay slurry is removed hydrochloric acid insoluble substance through skim gate, after the slagging-off its white clay slurry is imported No. 2 and be equipped with stock tank, add control agent in the stock tank fully at No. 2, the add-on of control agent is 0.03～0.06% of a white clay solids content, import after stirring and carry out in the shredder grinding the first time, the particle diameter D90 of white clay is 75 μ m before grinding, the particle diameter D90 that grinds the back white clay is 40 μ m, after grinding for the first time its clay wash body and function 200～325 purposes being revolved the sieve that shakes filters, screenings importing after the filtration is equipped with stock tank for No. 1 and grinds again, white clay slurry after the filtration imports No. 1 fine pulp tub, pour shredder again into and carry out the grinding second time, the median size of grinding the back white clay for the second time is less than 20 μ m, with No. 2 fine pulp tubs of its suction, clay wash bulk concentration after selected is 15～20 degree Beaume, imports carbonating tower then;
(5), the purification processes of paper industry alkali furnace exhaust: will contain CO from what paper industry alkali fire grate went out
2Waste gas feed spraying dust removal tower, washing tower successively and carry out the dedusting washing, remove impurities in waste gas, CO in the gas behind the washing, purifying
2Concentration reach 8～12%;
(6), carburizing reagent: contain CO after will purifying
2Gas by pressure fan with 20～30m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts with white clay slurry after selected, and stopped reaction when the pH value of slurry is 6.5～7.5 needs 3～5 hours;
(7), the part slurry lime carbonate that produces after the carburizing reagent is joined slurry as required, make the slurry light calcium carbonate product, it is personal to be transported to paper industry; Utilize water extracter to dewater remainder, dehydration back lime carbonate water ratio is 30～35%, utilizes drying machine to carry out drying then, and drying temperature is 100～300 ℃, can obtain the powder light calcium carbonate product after the drying, and its water ratio is less than 0.5%.
According to above-mentioned novel method, the stablizer described in the step (1) be in diethylenetriamine, Triethylenetetramine (TETA), quadrol, the trolamine any or any two; It is 100～200 mg/litre that described green liquor carries out the preceding solid impurity content of mechanism filter-pressing, and filtering back solid impurity content is 10～20 mg/litre; Green liquor mesosilicic acid salt component content is 8～13% before filtering, and filtering back green liquor mesosilicic acid salt component content is below 3%.
According to above-mentioned novel method, control agent is tertiary sodium phosphate or trolamine described in the step (4).
According to above-mentioned novel method, white clay slurry described in the step (4) is removed hydrochloric acid insoluble substance through skim gate, and hydrochloric acid insoluble substance is 7～10% through content before the skim gate, and removing back content is below 1%.
The slurry light calcium carbonate product whiteness of novel method preparation of the present invention〉88%, free alkali content≤0.184%, screenings content＜0.5% behind 325 mesh sieves can satisfy the requirement of paper industry fully excessively.
The powder light calcium carbonate product whiteness of novel method preparation of the present invention〉90%, free alkali content≤0.35%, settling volume〉2.4ml/g, screenings content＜0.6% behind 325 mesh sieves excessively.This powder light calcium carbonate product fineness, whiteness can be used for industries such as rubber, plastics, coating and papermaking thereof, as international sale than higher.
For the above-mentioned novel method of utilizing recovering solid white slime through alkaline pulping to prepare light calcium carbonate, stablizer diethylenetriamine, Triethylenetetramine (TETA), quadrol and the trolamine used in the process add it after with the dilution proportion of distilled water by 1:10; The control agent trolamine is pressed with distilled water to add after the dilution proportion of 1:10 and is used.
Positive beneficial effect of the present invention:
1, novel method of the present invention adds lime slurry in green liquor purification processes process; solved silicone content problem of higher in the green liquor; this novel method is not only applicable to handle the paper industry that adopts wood pulp to produce; also be applicable to the paper industry that adopts straw pulp to produce; solve paper industry alkali recovery process and produced the secondary severe contamination problem that white clay brought; help environment protection, have remarkable social benefit.
2, adopt the inventive method to handle the white clay that the paper industry alkali recovery process produces, white clay can be converted into light calcium carbonate fully, thoroughly solve the secondary severe contamination that white clay brings to paper industry, the slurry light calcium carbonate of the inventive method preparation is all supplied paper plant and is done the papermaking filler use, powder calcium carbonate product whiteness, fineness are higher, can be widely used in industries such as rubber, plastics, coating, papermaking,, have considerable economic as international sale.Realized that really waste residue utilizes again, turned waste into wealth, obtained favorable economic benefit.
3, also solved the part exhaust emission problem that paper industry alkali fire grate goes out in the novel method of the present invention, the waste gas that paper industry alkali roasting kiln produces has been handled through washing, purifying, made its CO
2Concentration reach 8～12%, replace technical grade CO
2, react with white clay after selected, not only reduce production cost, and solved the pollution problem of alkali stove institute waste discharge gas.
4, the slurry light calcium carbonate product whiteness that adopts novel method of the present invention to utilize the white clay of paper industry alkali recovery generation to make〉88%, free alkali content≤0.184%, residuum content＜0.5% behind 325 mesh sieves excessively.Powder light calcium carbonate product whiteness〉90%, free alkali content≤0.35%, settling volume〉2.4ml/g, residuum content＜0.6% behind 325 mesh sieves excessively.The slurry light calcium carbonate product can satisfy the requirement of present paper industry fully, and the powder light calcium carbonate product not only can be applied to paper industry, can also be applied to industries such as rubber, plastics and coating thereof as international sale.
5, the present invention has not only thoroughly solved paper industry alkali and has reclaimed the secondary severe contamination problem that produces the white clay waste residue, the pollution problem that has also solved part paper industry alkali stove institute waste discharge gas, and from environmental angle, the present invention has remarkable social benefit.
Four, description of drawings:
Fig. 1 utilizes recovering solid white slime through alkaline pulping to prepare the process flow sheet of light calcium carbonate
The process flow sheet of the selected and white clay regrind operation of white clay among Fig. 2 Fig. 1
Five, embodiment:
Following examples only in order to further specify the present invention, do not limit content of the present invention.
Embodiment one: utilize recovering solid white slime through alkaline pulping to prepare the novel method of light calcium carbonate
The detailed step of novel method of the present invention is as follows:
(1), green liquor purification processes process: in green liquor, add the stablizer diethylenetriamine be equivalent to green liquor volumetric concentration 15ppm and concentration and be 10% lime slurry, add green liquor after diethylenetriamine and distilled water the dilution proportion by 1:10, the add-on of lime slurry is 2 ‰ of a green liquor flow, the green liquor flow is 30 cubic meters/hours, carry out mechanical filter with pump suction pressure filter after stirring, it is 100～200 mg/litre that green liquor carries out the preceding solid impurity content of mechanism filter-pressing, and filtering back solid impurity content is 10～20 mg/litre; Green liquor mesosilicic acid salt component content is 8～13% before filtering, and filters back green liquor mesosilicic acid salt component content and reduces to below 3%, and the green liquor after the filtration imports storage tanks;
(2), unslaked lime is selected: unslaked lime with the vibratory screening apparatus processing of sieving, is removed cinder wherein, make in its unslaked lime less than 1 centimetre foreign matter content less than 3%, the purity of the back unslaked lime that sieves is that the content of calcium oxide reaches more than 85%;
(3), causticizing reaction: will carry out causticizing reaction in the green liquor after the adding of the unslaked lime after the selected purification, when carsticity stopped reaction greater than 88% time, the sodium hydroxide solution that generates uses in the paper industry again through after the conventional processing, carries out the white clay that produces selected;
(4), the refining process of white clay: with all or part of dissolving tank that enters of white clay of causticizing reaction generation, it is the slurry of 15 degree Beaume that thin up becomes concentration, white clay slurry after the dilution is filtered through 40 order vibratory screening apparatuss, pouring into slurry jar after the filtration, filter through 120 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, then the white clay slurry is removed hydrochloric acid insoluble substance through skim gate, hydrochloric acid insoluble substance is reduced to below 1% by original 7～10% through skim gate its content, after the slagging-off its white clay solution is imported No. 2 and be equipped with stock tank, be equipped with adding control agent tertiary sodium phosphate in the stock tank at No. 2, the add-on of tertiary sodium phosphate is 0.05% of a white clay solids content, import after stirring and carry out in the shredder grinding the first time, the particle diameter D90 of white clay is 75 μ m before grinding, the particle diameter D90 that grinds the back white clay is 40 μ m, after grinding for the first time its clay wash body and function 250 purposes being revolved the sieve that shakes filters, screenings importing after the filtration is equipped with stock tank for No. 1 and grinds again, white clay slurry after the filtration imports No. 1 fine pulp tub, pour shredder again into and carry out the grinding second time, the median size of grinding the back white clay for the second time is less than 20 μ m, with No. 2 fine pulp tubs of its suction, clay wash bulk concentration after selected is 18 degree Beaume, imports carbonating tower then;
(5), the purification processes of paper industry alkali furnace exhaust: will contain CO from what paper industry alkali fire grate went out
2Waste gas feed spraying dust removal tower, washing tower successively and carry out the dedusting washing, remove impurities in waste gas, CO in the gas behind the washing, purifying
2Concentration reach 8～12%;
(6), carburizing reagent: contain CO after will purifying
2Gas by pressure fan with 30m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts stopped reaction when the pH value of slurry is 7 with white clay slurry after selected;
(7), the part slurry lime carbonate that produces after the carburizing reagent is joined slurry as required, make the slurry light calcium carbonate product, it is personal to be transported to paper industry; Utilize water extracter to dewater remainder, dehydration back lime carbonate water ratio is 30～35%, utilizes drying machine to carry out drying then, and drying temperature is 150 ℃, can obtain the powder light calcium carbonate product after the drying, and its water ratio is less than 0.5%.
Gained slurry light calcium carbonate product whiteness of the present invention〉88%, free alkali content is 0.184%, excessively screenings content＜0.5% behind 325 mesh sieves.Gained powder light calcium carbonate product whiteness〉90%, free alkali content is 0.35%, settling volume〉2.4ml/g, screenings content＜0.6% behind 325 mesh sieves excessively.
Embodiment two: basic identical with embodiment one, something in common is no longer narrated, and difference is:
The stablizer that adopts in the step (1) is a Triethylenetetramine (TETA), add-on is 10ppm, adds green liquor with after itself and the dilution proportion of distilled water by 1:10, and the add-on of lime slurry is 3 ‰, the green liquor flow is 40 cubic meters/hours, adopts bag type filtering machine to carry out mechanical filter;
To concentration the slurry of 18 degree Beaume with the white clay thin up in the dissolving tank in the step (4), white clay slurry after the dilution is filtered through 60 order vibratory screening apparatuss, pouring into slurry jar after the filtration, filter through 150 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, remove hydrochloric acid insoluble substance through skim gate, its white clay slurry is imported No. 2 be equipped with stock tank, the control agent trolamine of adding 0.04%, trolamine and distilled water add the white clay slurry after pressing the dilution proportion of 1:10, after grinding for the first time the white clay slurry is revolved the sieve that shakes through 280 orders and filter, the concentration of selected back white clay slurry is 15 degree Beaume;
Step contains CO in (6)
2Gas by pressure fan with 20m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts stopped reaction when the pH value of slurry is 7.5 with white clay after selected;
Drying temperature is 200 ℃ in the step (7).
Embodiment three: basic identical with embodiment one, something in common is no longer narrated, and difference is:
The stablizer quadrol that adopts in the step (1), add-on is 20ppm, with its with the dilution proportion of distilled water by 1:10 after add green liquor, the add-on of lime slurry is 1 ‰, the green liquor flow is 20 cubic meters/hours, the employing bag type filtering machine carries out mechanical filter;
To concentration the slurry of 20 degree Beaume with the white clay thin up in the dissolving tank in the step (4), white clay slurry after the dilution is filtered through 80 order vibratory screening apparatuss, pouring into slurry jar after the filtration, filter through 180 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, remove hydrochloric acid insoluble substance through skim gate, its white clay slurry is imported No. 2 be equipped with stock tank, the control agent trolamine of adding 0.06%, trolamine and distilled water add the white clay slurry after pressing the dilution proportion of 1:10, after grinding for the first time the white clay slurry is revolved the sieve that shakes through 325 orders and filter, the concentration of selected back white clay slurry is 18 degree Beaume;
Step contains CO in (6)
2Gas by pressure fan with 25m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts stopped reaction when the pH value of slurry is 6.5 with white clay after selected;
Drying temperature is 300 ℃ in the step (7).
Embodiment four: basic identical with embodiment one, something in common is no longer narrated, and difference is:
The stablizer that adopts in the step (1) is a trolamine, and add-on is 18ppm, with its with the dilution proportion of distilled water by 1:10 after add green liquor, the add-on of lime slurry is 2.5 ‰, the green liquor flow is 35 cubic meters/hours, the employing pressure filter carries out mechanical filter;
To concentration the slurry of 16 degree Beaume with the white clay thin up in the dissolving tank in the step (4), white clay slurry after the dilution is filtered through 40 order vibratory screening apparatuss, pouring into slurry jar after the filtration, filter through 120 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, remove hydrochloric acid insoluble substance through skim gate, its white clay slurry is imported No. 2 be equipped with stock tank, the control agent tertiary sodium phosphate of adding 0.03%, after grinding for the first time the white clay slurry is revolved the sieve that shakes through 250 orders and filter, the concentration of selected back white clay slurry is 15 degree Beaume;
Step contains CO in (6)
2Gas by pressure fan with 28m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts stopped reaction when the pH value of slurry is 7 with white clay after selected;
Drying temperature is 180 ℃ in the step (7).
Embodiment five: basic identical with embodiment one, something in common is no longer narrated, and difference is:
The stablizer that adopts in the step (1) is a Triethylenetetramine (TETA), add-on is 13ppm, adds green liquor with after itself and the dilution proportion of distilled water by 1:10, and the add-on of lime slurry is 1.5 ‰, the green liquor flow is 25 cubic meters/hours, adopts pressure filter to carry out mechanical filter;
To concentration the slurry of 20 degree Beaume with the white clay thin up in the dissolving tank in the step (4), white clay slurry after the dilution is filtered through 80 order vibratory screening apparatuss, pouring into slurry jar after the filtration, filter through 200 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, remove hydrochloric acid insoluble substance through skim gate, its white clay slurry is imported No. 2 be equipped with stock tank, the control agent tertiary sodium phosphate of adding 0.05%, after grinding for the first time the white clay slurry is revolved the sieve that shakes through 250 orders and filter, the concentration of selected back white clay slurry is 18 degree Beaume;
Step contains CO in (6)
2Gas by pressure fan with 30m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts stopped reaction when the pH value of slurry is 7.5 with white clay after selected;
Drying temperature is 100 ℃ in the step (7).
Embodiment six: basic identical with embodiment one, something in common is no longer narrated, and difference is:
The stablizer diethylenetriamine that adopts in the step (1), add-on is 16ppm, with its with the dilution proportion of distilled water by 1:10 after add green liquor, the add-on of lime slurry is 2 ‰, the green liquor flow is 30 cubic meters/hours, the employing pressure filter carries out mechanical filter;
To concentration the slurry of 18 degree Beaume with the white clay thin up in the dissolving tank in the step (4), white clay slurry after the dilution is filtered through 40 order vibratory screening apparatuss, pouring into slurry jar after the filtration, filter through 120 order vibratory screening apparatuss again, filter the back and import stock tank fully No. 1, remove hydrochloric acid insoluble substance through skim gate, its white clay slurry is imported No. 2 be equipped with stock tank, the control agent trolamine of adding 0.05%, trolamine and distilled water add the white clay slurry after pressing the dilution proportion of 1:10, after grinding for the first time the white clay slurry is revolved the sieve that shakes through 325 orders and filter, the concentration of selected back white clay slurry is 18 degree Beaume;
Step contains CO in (6)
2Gas by pressure fan with 25m
3The flow of/min feeds carbonation reaction tower by carbonating tower bottom, fully reacts stopped reaction when the pH value of slurry is 7 with white clay after selected;
Drying temperature is 230 ℃ in the step (7).
Claims (8)
1, a kind of novel method of utilizing recovering solid white slime through alkaline pulping to prepare light calcium carbonate, described novel method comprise that unslaked lime is selected, causticizing reaction and carburizing reagent, it is characterized in that:
(1), green liquor purification processes process: in green liquor, add the stablizer be equivalent to green liquor volumetric concentration 10～20ppm and concentration and be 10% lime slurry, the add-on of lime slurry is 1 of green liquor flow～3 ‰, the green liquor flow is 20～40 cubic meters/hours, carries out mechanical filter after stirring;
(2), unslaked lime through vibratory screening apparatus sieve handle selected after, wherein less than 1 centimetre foreign matter content less than 3%, the purity of unslaked lime is that the content of calcium oxide reaches more than 85%;
(3), in the causticizing reaction process, when carsticity stopped reaction greater than 88% time;
(4), the refining process of white clay: the white clay that causticizing reaction is produced enters dissolving tank and is diluted to the slurry that concentration is 15～20 degree Beaume, white clay slurry after the dilution is carried out screening and filtering twice through 40～80 orders and 120～200 order vibratory screening apparatuss, white clay slurry after filtering is removed wherein hydrochloric acid insoluble substance through skim gate, in the white clay slurry, add the control agent that accounts for white clay solids content 0.03～0.06% then, after stirring it is imported shredder and carry out the grinding first time, grind after 200～325 purposes are revolved the sieve that shakes filters, filter back importing shredder and carry out the grinding second time, import carbonation reaction tower then;
(5), the purifying treatment of paper industry alkali furnace exhaust: contain CO with what paper industry alkali fire grate went out
2Waste gas carry out dedusting washing, CO in the gas behind the washing, purifying by spraying dust removal tower, washing tower successively
2Concentration reach 8～12%;
(6), carburizing reagent: contain CO after will purifying
2Gas by pressure fan with 20～30m
3The flow of/min is fed in the tower by the carbonating tower bottom, fully react with the white clay slurry after selected, stopped reaction when the pH value of slurry is 6.5～7.5 is made the slurry light calcium carbonate product with the part slurry that produces, and remainder is made the powder light calcium carbonate product through dehydration, drying.
2, novel method according to claim 1 is characterized in that: stablizer described in the feature (1) be in diethylenetriamine, Triethylenetetramine (TETA), quadrol, the trolamine any or any two; Pressure filter or bag type filtering machine are adopted in described filtration; It is 100～200 mg/litre that described green liquor carries out the preceding solid impurity content of mechanical filter, and filtering back solid impurity content is 10～20 mg/litre; Green liquor mesosilicic acid salt component content is 8～13% before filtering, and filtering back green liquor mesosilicic acid salt component content is below 3%.
3, novel method according to claim 1 is characterized in that: the sodium hydroxide solution that generates in feature (3) causticizing reaction uses in the paper industry again through conventional processing, carries out the white clay that produces selected.
4, novel method according to claim 1 is characterized in that: control agent is tertiary sodium phosphate or trolamine described in the feature (4).
5, novel method according to claim 1 is characterized in that: in the feature (4) behind skim gate in the white clay slurry content of hydrochloric acid insoluble substance reduce to below 1% by 7～10%; The particle diameter D90 of white clay is 75 μ m before grinding for the first time, and the particle diameter D90 that grinds the back white clay is 40 μ m; Screenings after 200～325 orders revolve the sieve filtration of shaking imports for the first time, and shredder grinds again; The median size of grinding the back white clay for the second time is less than 20 μ m, and the clay wash bulk concentration is 15～20 degree Beaume.
6, novel method according to claim 1 is characterized in that: feature (6) dehydration back lime carbonate water ratio is 30～35%, and drying temperature is 100～300 ℃, and dry back powder light calcium carbonate product water ratio is less than 0.5%.
7, novel method according to claim 1 is characterized in that: slurry light calcium carbonate product whiteness described in the step (6)〉88%, free alkali content≤0.184%, screenings content＜0.5% behind 325 mesh sieves excessively.
8, novel method according to claim 1 is characterized in that: powder light calcium carbonate product whiteness described in the step (6)〉90%, free alkali content≤0.35%, settling volume〉2.4ml/g, screenings content＜0.6% behind 325 mesh sieves excessively.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553890A (en) * | 2012-01-18 | 2012-07-11 | 牟作峰 | White mud recycling method |
| CN102786732A (en) * | 2012-09-07 | 2012-11-21 | 上海第二工业大学 | Method for producing plastic filling master batch through papermaking waste white mud |
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