CN102070309A - Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge - Google Patents
Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge Download PDFInfo
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Abstract
The invention discloses a method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge. The method comprises the following steps: preparing a mixture: putting papermaking causticized white sludge and pulverized fuel ash into a forced type stirrer for stirring, and putting burnt clay into the forced type stirrer for evenly stirring to obtain the mixture; molding the mixture: molding by adopting a centrifugal rolling balling method or shaking pressurization method; naturally curing the mixture: putting the molded mixture balls into the natural environment with good ventilation conditions for stacking and curing, and putting adobes into the natural environment with good ventilation conditions for stacking and curing for 7-14 days until the quality of the adobes can not be further reduced and the primary compression strength of the adobes is more than 1MPa; and calcining the material: conveying the cured and dried material balls or adobes into a shaft kiln for calcining and insulating, then naturally cooling to the room temperature, and milling the calcined products to be used for preparing silicate products. The invention reduces the dust pollution and solves the problem of treatment of pulverized fuel ash.
Description
Technical field
The invention belongs to inoganic solids utilization of waste as resource field, particularly a kind of method of utilizing industrial residue papermaking causticization clay-slag to prepare New Building Materials.
Background technology
China is pulping and paper-making big country, adopts the chemical pulping method at present, and chemical pulping utilizes various chemical agents exactly, under given conditions the most of lignin stripping in the plant fiber material is made it to be dispersed into paper pulp.Summarize and get up to be divided into soda pulping and sulfite pulping two big classes.Soda pulping is mainly used to produce some straw pulp, as rice wheat straw, Herba Poae Sphondylodis, reed etc.Kraft process is mainly used to produce wood pulp, also is useful on system bamboo pulp and straw pulp.Adopting the chemical pulping method, which kind of raw material papermaking all will produce black liquor with, contain a large amount of salkali waste and organism in the black liquor, is one of severe contamination source of water body.Many paper mills do not add any processing and at will black liquor are discharged in the lake, river, have wasted on the one hand a large amount of alkali resources, on the other hand severe contamination environment.It is the first-selected measure of China's paper industry environmental improvement that alkali reclaims, and it not only has good economic benefits, and also has good social benefit, to improving environment important effect and meaning is arranged.
The essential distinction of China's paper industry and American-European developed country is the difference of slurrying kind, and external papermaking is based on wood pulp, and China's wood pulp, non-wood pulp (straw, wheat straw, Herba Poae Sphondylodis, reed etc. are raw material) paper technology respectively account for 50% approximately.Papermaking causticization clay-slag is meant chemical pulping method--the black liquor of pulp making that soda processes produces is through the alkali and the organism that extract, evaporation concentration forms solid content 50%～70%, then concentrated solution is placed in the alkali recovery boiler and burns, with the organism burning-off, obtain melts, its main component is yellow soda ash Na
2CO
3And Na
2S.Melts formation green liquor soluble in water through causticization process, will digest in the lime adding green liquor making yellow soda ash be converted into sodium hydroxide, and calcium hydroxide forms precipitation of calcium carbonate.Suspension liquid after the causticization is used for slurrying through clarification, washing, filtrate filtered recirculation, obtains throw out lime carbonate simultaneously and forms causticization clay-slag (white clay filter cake) through concentrated, vacuum hydro-extraction, and alkali reclaims causticization clay-slag generation technical process and sees Fig. 1.
Alkali reclaims annual pulping and paper-making factory and produce more than 300 ten thousand tons of clay-slags in alkali recovery process.According to statistics, China's paper industry slurrying alkali in 2005 reclaims enterprise 98,152.36 ten thousand tons of year recovery caustic soda amounts.Wherein wood pulp alkali reclaims 36 of enterprises, 68.51 ten thousand tons of year recovery caustic soda amounts; Non-wood pulp alkali reclaims 62 of enterprises, and non-wood pulp enterprise reclaimed 83.85 ten thousand tons of caustic soda amounts in 2005, accounted for 55.0% of total recovery caustic soda amount, 174.68 ten thousand tons of untreated causticization clay-slags.And non-wood pulp enterprise's year in 2000 was reclaimed 13.88 ten thousand tons of caustic soda amounts, 28.92 ten thousand tons of untreated causticization clay-slags.The quantity discharged of causticization clay-slag increases by 6 times in 5 years, and accumulative total is discharged 563.53 ten thousand tons.Along with the increase of China's chemical recovery system quantity, the quantity discharged of annual causticization clay-slag presents rising tendency in recent years.This shows that causticization clay-slag quantity discharged is big, and environment is caused severe contamination.
Alkali reclaims following chemical reaction has taken place in the causticization process:
The water dissolution process of melts
(Na
2CO
3)+H
2O＝＝＝＝2Na
++OH
-+HCO
3 ----------------------------------------(1)
HCO
3 -+H
2O＝＝＝＝OH
-+H
2CO
3-----------------------------------------------(2)
The causticization process
CaO+H
2O＝＝＝Ca(OH)
2＝＝＝＝2OH
-+Ca
2+------------------------------------(3)
2Na
++H
2CO
3+2OH
-+Ca
2+＝＝＝＝CaCO
3↓+2NaOH+H
2O----------------------------(4)
As can be seen, the causticization process forms sodium hydroxide and precipitation of calcium carbonate from above-mentioned test reaction formula (1-4), and precipitated chalk is exactly the clay-slag that alkali recovery process produces, and wherein contains part unreacted calcium hydroxide (Ca (OH) completely
2) and the residual alkali (Na of part
+), so the causticization clay-slag is called alkaline clay-slag again.Single from reaction formula (4) result, there is not the technical problem of utilizing in the utilization of clay-slag, throw out is formed calcium oxide CaO again through super-dry, calcining, can utilize once more.With timber is the causticization clay-slag of pulping raw material, because silicone content is few, some large-scale paper mills all are to adopt the calcined by rotary kiln method to make white slime as recycling both at home and abroad, produce unslaked lime again, recycle in causticization.And in fact wheat (rice, reed) straw pulp is mainly adopted in China's papermaking, wheat (rice, reed) straw pulp contains silicon-dioxide usually, contain the white clay recovery use of silicon when employing after, wherein the silicon content height is understood and alkalimetal oxide formation water glass material, cause material gluing, can't separate, if reclaiming recycles, element silicon is accumulation constantly, certainly will cause chemical recovery system normally to move.On the other hand, concentrated black liquor in the alkali recovery boiler when burning sodium oxide and silicon form various water glass, sodium silicoaluminate mineral, these class mineral are easy to fouling in producing pipeline, the long-term accumulation of fouling causes the production unit service efficiency to descend, and energy consumption increases even influence is produced.Therefore most of is that the alkali of raw material reclaims because silicon disturbs often can't reclaim with the straw pulp, and the causticization clay-slag directly discharges, and causes environmental pollution.
The heat energy that it is one of operation of energy consumption maximum in each operation of chemical pulping that the causticization clay-slag reclaims, consumed is approximately 10% of the required energy consumption of full factory.Because causticization clay-slag water ratio height, main component is a precipitated chalk, is powdery, fineness is big, and dust pollution is serious during calcining, and causticization clay-slag recovery system commonly used is a rotary kiln, and its purposes is dry and the burning white clay, and fuel used is heavy oil or Sweet natural gas.Through heat calculation, 1 ton of lime of the every recovery of the lime rotary kiln of domestic operation, consume heavy oil 250-300kg, wherein the moisture evaporation heat dissipation accounts for more than 40% of total energy consumption, energy utilization rate is low, and calcining cost height is energy-conservation key point so puddling cake moisture is gone in reduction.Adopt mechanize, the higher calcined by rotary kiln mode of level of automation, it is big to have throughput, characteristics such as continous way production, but need to adopt the high-level efficiency device for recovering powder, facility investment is big, the production cost height, and day output is big, and this mode is not suitable for the processing that China medium-sized enterprise produces tens thousand of tons of causticization clay-slags per year, and there are problems such as under-capacity operation, the idleness of equipment in most of enterprise.
Based on above difficulty, make that the causticization clay-slag can not get dealing carefully with all the time, except that minority enterprise fully utilized the causticization clay-slag, ground landfill or stacking were just selected by most of enterprises.Comprehensive utilization about the causticization clay-slag at present mainly shows following three aspects: aspect material of construction, can utilize the causticization clay-slag to produce cement, putty, solid paint for building construction, buildings sheet material waterproof paint and interior wall, exterior coating etc.; In plastic industry, can utilize the causticization clay-slag to replace lime carbonate as the stopping composition in some plastics such as the industrial supporting plastic cement component production such as woven bag, woven cloth, semi-hard plastic floor leather, tubing, profiled material and automobile, household electrical appliances; And in environmental protection industry (epi), some unit is used for the causticization clay-slag sweetening agent and the coal briquette bond and the desulfurizing assistant agent etc. of power boiler smoke evacuation in recent years.Though at present China aspect a lot of to white clay processing and utilizing in addition, but these methods all have limitation separately, in its comprehensive utilizating research and exploitation, face many problems, for example, when the causticization clay-slag is transported to the alternative part Wingdale in cement mill as raw material production cement, energy consumption problem has just become an important problem, and its economic benefit is very little, and it is applied also and is not easy.When the causticization clay-slag was used as fume desulfurizing agent, if use wet white clay, because its pH value height, life-time service can produce corrosive nature to sweetener.If use extra dry white wine mud, then the energy consumption increase causes use cost to improve, and the problems referred to above all are the major causes that the causticization clay-slag can not be utilized effectively for a long time.The chemical recovery system quantity newly-built along with China's enterprises in pulp and paper industry increases, scale enlarges, and the causticization clay-slag of generation will proportionally increase considerably and accumulate, and comprehensive utilization how to accelerate it just becomes in China's paper industry very distinct issues.
The foreign patent technology is primarily aimed at the wood pulp papermaking system.Because the wood pulp silicone content seldom, the causticization alkaline residue can be used as lime through calcining and reclaims causticization again and recycle.China's timber resources is very deficient, develops non-wood pulp paper-making technique, adopts the regenerated papermaking resource to be fit to China's national situation.Straw, wheat straw resource are very abundant in China, 9,954 ten thousand tons of wheat annual production.The major production areas has: Henan, Shandong, Hebei, Jiangsu, Anhui, and 8,000 ten thousand tons of wheat straw output can be produced 3,000 ten thousand tons of paper pulp, and straw, wheat straw are used for papermaking in the existing successful experience of China as agricultural wastes.Because non-wood pulp causticization alkaline residue contains silicon, contain the silicon-dioxide about 5-10% usually in the causticization clay-slag, this part silicon exists with non-crystalline state, influences the causticization process alkali recovery efficiency.If recycle, silicon also can constantly accumulate, therefore the difficult problem that is treated as enterprise development of non-wood pulp papermaking causticization clay-slag.Adopt rotary kiln mode lime kilning, reclaim 125 kilograms of calculating of kiln screenings expendable weight oil per ton by Finland's causticization alkaline residue, the incinerating fuel cost is difficult to promote in China up to 300 yuan of/ton lime.Domestic and international new patent searching is found, more at the black liquor processing patent that wood pulp papermaking alkali reclaims, discuss rare to the patent that the siliceous causticization clay-slag of straw pulp class is handled.This phenomenon had both illustrated that straw pulp class pulping process only adopted, has China's paper making raw material characteristic in China in a large number, proved absolutely difficulty and arduousness that siliceous, ultra-fine, aqueous causticization clay-slag comprehensive utilization is administered again.Development is fit to the papermaking alkaline residue recovery technology of China's national situation, and forming China's independent intellectual property right improvement papermaking alkali recovery causticization clay-slag treatment technology is the problem that patent of the present invention will solve.
Summary of the invention
The object of the present invention is to provide a kind ofly to have characteristics such as complicated component, water ratio height, alkalescence is big, particle is thin at papermaking causticization clay-slag and cause it to can not get effective processing for a long time, provide a kind of technology treatment process simple, with low cost.
The technical solution that realizes the object of the invention is: a kind of papermaking alkali reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: compound preparation, papermaking causticization clay-slag, flyash are put into forced mixer and stirred, treat that various material put into forced mixer with chainotte after mixing and stir, obtain compound;
Second step: the compound moulding, adopt centrifugal rolling balling method or vibrations extrusion forming, promptly
In centrifugal rolling balling method, the compound for preparing is put into balling-up equipment pan-pelletizer, rotate pan-pelletizer, add 1～5% the flyash that accounts for papermaking causticization clay-slag quality or 1～5% chainotte in gradually in the pan-pelletizer, the mixing pellet that formation has initial strength;
In the vibrations extrusion forming, select concrete block moulding machine for use, the compound for preparing is put into the block machine hopper, through the vibrations extrusion forming, obtain standard square size moulding adobe;
The 3rd step: natural curing, the formed mixed material ball is placed in the ventilation condition good natural environment stacks maintenance, adobe is placed and to be stacked maintenance 7～14 days in the ventilation condition good natural environment, no longer alleviates and has above the initial ultimate compression strength more than the 1MPa up to unfired brick quality;
The 4th step: material calcining, dry good pellet of maintenance or adobe are sent into calcining insulation in the shaft kiln, naturally cool to room temperature then, be applied to prepare silicate product after calcinate is levigate.
The present invention compared with prior art, its remarkable advantage: (1) at present papermaking enterprise all is furnished with the industry-owned thermal power plant and discharges with flyash, the flyash of discharging can be directly used in this method and prepare causticization burning of lime sludge material.Solidify calcining material base body by the pozzolanic activity reaction, reduce dust pollution, calcinate is used to produce silicate product, and the silicon that with forms such as Calucium Silicate powder, water glass exist in the causticization white clay this moment has become favourable composition, has solved the handling problem of flyash; (2) the causticization clay-slag of forming has certain blank strength, and with the aquation of flyash, the intensity of spheroid or adobe strengthens gradually, can satisfy the requirement of long-term stacking; (3) adopt present method that the preceding water ratio of causticization clay-slag calcining is reduced significantly, compare with direct causticization clay-slag and reduced calcinating consumption, saved the calcining cost; (4) present method also makes the causticization clay-slag when transportation, calcining, and the dust pollution question that causes greatly because of particle fineness is well solved; (5) the causticization clay-slag after moulding can adopt cheaply the shaft kiln calcination technology to calcine, and is used to prepare silicate product calcareous material and masonry mortar by selecting the alternative building lime of product after the suitable calcining process parameter calcining.Because of the dehydration of the low temperature Calucium Silicate powder that forms in the calcinate and part hydrated product equates that mineral have the rehydration ability, therefore and its performance of calcining clay-slag that the present invention obtains is better than common lime mechanical property to silicate product and masonry mortar plays promoter action; (6) the present invention had both solved alkali and had reclaimed the problem of environmental pollution that the causticization clay-slag causes, make the lime carbonate resource obtain effective utilization again, it is the processing of the causticization clay-slag of raw pulp generation that present method is fit to timber and non-timber, and the alkali that is suitable for large and medium-sized papermaking enterprise reclaims the causticization clay-slag and handles.In the calcinate that the present invention obtained, active oxidation calcium contents 50%～78%, high reactivity gel mineral content 10%～20% has the hydraulic performance more excellent than commodity lime.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is a paper-making pulping alkali recovery process schema of the present invention.
Fig. 2 handles the process flow sheet of papermaking causticization white clay method for the present invention.
Fig. 3 handles the another kind of process flow sheet of papermaking causticization white clay method for the present invention.
Embodiment
Papermaking alkali of the present invention reclaims the technical thought that the causticization clay-slag prepares the method for hydraulicity calcium oxide: 1. with the causticization clay-slag with have chemical reactivity and have the material mixing moulding of high water absorbing capacity, reach preliminary reduction water ratio; 2. utilize in-situ chemical reaction to solidify dehydration and chemical reaction sclerosis, make the causticization clay-slag of moulding have certain intensity, can carry, stack for a long time, reduce and go into the kiln water ratio and reduce dust; 3. adopt shaft kiln calcination, save the calciner investment, save calcinating consumption; 4. utilizing wheat straw, straw to contain silicon and interpolation has the pozzolanic activity material and forms hydrated calcium silicate gel in the chemical reaction phase and can improve the intensity of not calcining causticization clay-slag formed body, its main chemical reactions:
Ca(OH)
2+XSiO
2+YH
2O＝＝CaO·XSiO
2·YH
2O
Ca(OH)
2+MAl
2O
3+NH
2O＝＝CaO·MAl
2O
3·NH
2O
During the calcining of causticization clay-slag, established hydrated calcium silicate, drated calcium aluminate dewater to form in calcination process and have the metastable structure silicate minerals, the silicon-oxy tetrahedron depolymerization, the dehydration mineral have good rehydration ability, and the lime that makes calcining causticization clay-slag obtain has the hydraulic performance.
The papermaking causticization clay-slag of indication of the present invention is meant by concentrating the white clay filter cake that press filtration or vacuum press filtration obtain, contains part unreacted calcium hydroxide (Ca (OH) completely
2) and the residual alkali (Na of part
+), water ratio is 35%～55% usually; Chainotte is meant that through 600 ℃ of-900 ℃ of calcined clays through grinding, its essential mineral is unformed metakaolin mutually.
Papermaking alkali of the present invention reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: material proportion
The compound preparation, soon papermaking causticization clay-slag, flyash (accounting for the 5-15% of causticization clay-slag total mass) are proportionally put into forced mixer stirring 2-3 minute, treating that various material mix when acquisition is moistening plastic state for the first time stops to stir, chainotte (accounting for the 5-10% of causticization clay-slag total mass) is proportionally put into forced mixer to be stirred 1-2 minute, treating that various material mix stops when being moistening plastic state stirring, and material at this moment is called compound;
Second step: compound moulding, the present invention adopts two kinds of method moulding: the centrifugal rolling balling method of a kind of employing, promptly the compound for preparing is put into balling-up equipment pan-pelletizer, with certain rotational speed pan-pelletizer, add 1～5% the flyash that accounts for causticization clay-slag total mass or 1～5% chainotte in then gradually in the pan-pelletizer, to forming the mixing pellet with certain initial ultimate compression strength, the pellet size is controlled at 10-30mm; Second kind of molding mode adopts the vibrations extrusion forming, selects concrete block moulding machine for use, and the causticization clay-slag compound that the first step obtains is directly put into the block machine hopper, through the vibrations extrusion forming, obtains the adobe of standard square size 240*115*53mm size.
The 3rd step: natural curing (reaction dehydration, aquation is solidified), the formed mixed material ball is placed in the ventilation condition good natural environment stacks maintenance, adobe is placed in the ventilation condition good natural environment stacks maintenance 7～14 days, no longer alleviates and has initial ultimate compression strength more than the 1MPa up to unfired brick quality;
The 4th step: material calcining, be about to (the reaction dehydration of maintenance drying, hydration and hardening) good moulding pellet or adobe are sent into and are fired to 800～1100 ℃ in the shaft kiln, insulation 1-4 hour, naturally cool to room temperature then, calcinate can replace common lime to be applied to prepare silicate product and material after levigate.
The principle of the invention is to utilize to contain the part Calcium of intensifiens in the papermaking causticization clay-slag (with Ca (OH)
2Form exists) and residual alkali and flyash in active silica, alumina composition generation have a gelling product of intensity and balling-up, the causticization clay-slag ball warp natural curing drying of forming, aquation, solidify to form causticization clay-slag mixing pellet, can satisfy transportation, accumulation and incinerating requirement with good initial strength.
The principle of the invention is to adopt chainotte as siliceous raw material, be kaolin mainly according to containing essential mineral in the clay, kaolin is through calcining the hydroxyl of sloughing in the structure, obtaining metakaolin is a kind of unformed mineral, silicon oxide in the metakaolin and aluminum oxide have very high chemical reactivity, make chainotte have good pozzolanic activity can with calcareous material generation pozzolanic reaction.The more important thing is that metakaolin has very high specific surface area, contain a large amount of micro hole constructions, have very strong water-retaining capacity, can adsorb the free-water in the clay-slag, can play and regulate compound shaping work state, have the effect that promotes the compound moulding.
The principle of the invention is to have adopted gradation reinforced in stirring technique, be that causticization clay-slag and flyash stir first, because flyash is based on vitreum, water-absorbent relatively a little less than, help compound and stir, adding chainotte once more is to utilize chainotte to contain a large amount of micropores and characterization of adsorption, plays and reduces the compound free-water, make compound reach the requirement of moulding workability, promote the compound moulding.
Embodiment 1:
In conjunction with Fig. 2, papermaking alkali of the present invention reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: 500kg causticization clay-slag and 75kg flyash are put into stirrer stirred 2～3 minutes, when material to be mixed presents uniform state, add the 25kg chainotte inside and continue to stir 1～2min, this moment, compound was the uniform mixing state;
Second step: change the compound for preparing over to balling-up equipment, with certain rotational speed balling-up tube (pan-pelletizer), and in tube, add the 25kg chainotte gradually, when balling-up tube rotation time is 6～8 minutes, can form the spheroid that diameter is 10～30mm size in the tube, pellet has certain initial strength (highly freely fall and do not destroy and judge from 1m according to it);
The 3rd step: second pellet that make of step is piled up maintenance 7～14 days to spheroid mass naturally no longer alleviate, pellet has good intensity at this moment, can satisfy transportation, incinerating requirement;
The 4th step: the 3rd pellet that obtain of step is sent into vertical lime burner furnace calcine, calcining temperature is controlled at 800～1100 ℃, and insulation 2h naturally cools to room temperature afterwards;
The 5th step: the pellet calcinate after the 4th step calcining with the ball mill grinding to fineness 0.2mm screen over-size less than 5%, the calcinate after levigate replaces common lime to be used to prepare high-performance silicate product, masonry mortar and material of construction.
Embodiment 2:
In conjunction with Fig. 2, papermaking alkali of the present invention reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: 500kg causticization clay-slag and 50kg flyash are put into stirrer stirred 2～3 minutes, when material to be mixed presents uniform state, add the 50kg chainotte inside and continue to stir 1～2min, this moment, compound was the uniform mixing state;
Second step: change the compound for preparing over to balling-up equipment, with certain rotational speed balling-up tube (pan-pelletizer), and in tube, add 25kg flyash gradually, when balling-up tube rotation time is 6～8 minutes, can form the spheroid that diameter is 10～30mm size in the tube, pellet has certain initial strength (initial strength highly freely falls and do not destroy judgement from 1m according to it);
The 3rd step: second pellet that make of step is piled up maintenance 7～14 days to spheroid mass naturally no longer alleviate, pellet has good intensity at this moment, can satisfy transportation, incinerating requirement;
The 4th step: the 3rd pellet that obtain of step is sent into vertical lime burner furnace calcine, calcining temperature is controlled at 800～1000 ℃, and calcining insulation 2h naturally cools to room temperature afterwards;
The 5th step: the pellet calcinate after the 4th step calcining with the ball mill grinding to fineness 0.2mm screen over-size less than 5%, the calcinate after levigate replaces common lime to be used to prepare high-performance silicate product, masonry mortar and material of construction.
Embodiment 3:
In conjunction with Fig. 3, papermaking alkali of the present invention reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: 500kg causticization clay-slag and 50kg flyash are put into stirrer stirred 2～3 minutes, when material to be mixed presents uniform state, add the 50kg chainotte inside and continue to stir 1～2min, this moment, compound was the uniform mixing state;
Second step: change the clay-slag compound over to concrete block moulding machine, the vibrations extrusion forming, the base substrate of moulding is placed on natural curing on the test block supporting plate, waits to have to be carried to the stockyard after certain initial ultimate compression strength and to carry out natural curing;
The 3rd step: will pile up maintenance 7～14 days to green body quality naturally through second test specimen that make of step and substantially no longer alleviate, adobe ultimate compression strength can satisfy transportation, incinerating requirement above 1MPa;
The 4th step: the 3rd test specimen that obtain of step is sent into vertical kiln calcine, calcining temperature is controlled at 900～1100 ℃, and insulation 3h naturally cools to room temperature afterwards;
The 5th step: the product after the 4th step calcining with the ball mill grinding to fineness 0.2mm screen over-size less than 5%, the calcinate after levigate replaces common lime to be used to prepare high-performance silicate product, masonry mortar and material of construction.
Embodiment 4:
In conjunction with Fig. 3, papermaking alkali of the present invention reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: 500kg causticization clay-slag and 75kg flyash are put into stirrer stirred 2～3 minutes, when material to be mixed presents uniform state, add the 25kg chainotte inside and continue to stir 1～2min, this moment, compound was the uniform mixing state;
Second step: change causticization clay-slag compound over to concrete block moulding machine, the vibrations extrusion forming, the base substrate of moulding is placed on natural curing on the test block supporting plate, waits to have to be carried to the stockyard after certain initial ultimate compression strength and to carry out natural curing;
The 3rd step: will pile up maintenance 7～14 days to green body quality naturally through second test specimen that make of step and substantially no longer alleviate, adobe ultimate compression strength can satisfy transportation, incinerating requirement above 1MPa;
The 4th step: the 3rd test specimen that obtain of step is sent into vertical kiln calcine, calcining temperature is controlled at 800～1000 ℃, and insulation 4h naturally cools to room temperature afterwards;
The 5th step: the product after the calcining of the 4th step sieves screen over-size less than 5% with the ball mill grinding to fineness 0.2mm, and the calcinate after levigate replaces common lime to be used to prepare high-performance silicate product, masonry mortar and material of construction.
Claims (3)
1. a papermaking alkali reclaims the method that the causticization clay-slag prepares hydraulicity calcium oxide, may further comprise the steps:
The first step: compound preparation, papermaking causticization clay-slag, flyash are put into forced mixer and stirred, treat that various material put into forced mixer with chainotte after mixing and stir, obtain compound;
Second step: the compound moulding, adopt centrifugal rolling balling method or vibrations extrusion forming, promptly
In centrifugal rolling balling method, the compound for preparing is put into balling-up equipment pan-pelletizer, rotate pan-pelletizer, add 1～5% the flyash that accounts for papermaking causticization clay-slag quality or 1～5% chainotte in gradually in the pan-pelletizer, the mixing pellet that formation has initial strength;
In the vibrations extrusion forming, select concrete block moulding machine for use, the compound for preparing is put into the block machine hopper, through the vibrations extrusion forming, obtain standard square size moulding adobe;
The 3rd step: natural curing, the formed mixed material ball is placed in the ventilation condition good natural environment stacks maintenance, adobe is placed and to be stacked maintenance 7～14 days in the ventilation condition good natural environment, no longer alleviates and has above the initial ultimate compression strength more than the 1MPa up to unfired brick quality;
The 4th step: material calcining, dry good pellet of maintenance or adobe are sent into calcining insulation in the shaft kiln, naturally cool to room temperature then, be applied to prepare silicate product after calcinate is levigate.
2. papermaking alkali according to claim 1 reclaims the method that the causticization white clay prepares hydraulicity calcium oxide, it is characterized in that in the first step, causticization clay-slag and flyash mass ratio are 100: 15～5, and the mass ratio of causticization clay-slag and chainotte raw material is 100: 10～5.
3. papermaking alkali according to claim 1 reclaims the method that the causticization white clay prepares hydraulicity calcium oxide, it is characterized in that in the 4th step 800～1100 ℃ of calcining temperatures, insulation 1-4 hour.
Priority Applications (1)
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| CN102584153A (en) * | 2012-02-11 | 2012-07-18 | 朱国和 | Method for recycling low-silicon high-calcium industrial waste materials and products prepared by method |
| CN103011706A (en) * | 2012-12-14 | 2013-04-03 | 海南蓝岛环保产业股份有限公司 | Concrete taking green mud and white mud as admixtures and preparation method for concrete |
| CN103613111A (en) * | 2013-11-20 | 2014-03-05 | 四川银鸽竹浆纸业有限公司 | Method for producing lime by recovery of white clay with papermaking alkali |
| CN106396432A (en) * | 2016-08-31 | 2017-02-15 | 王桂林 | Method for recovering active lime from pulping and papermaking white mud |
| CN106431097A (en) * | 2015-08-04 | 2017-02-22 | 海南金海浆纸业有限公司 | Preparation method of new material using papermaking waste mud and new material thereof |
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| CN108609878A (en) * | 2018-05-29 | 2018-10-02 | 福建鼎盛元环保科技有限公司 | A kind of production line and its technique preparing aluminophosphates cementitious material using white clay |
| CN111348850A (en) * | 2018-12-21 | 2020-06-30 | 西南科技大学 | Hydraulic lime and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102584153A (en) * | 2012-02-11 | 2012-07-18 | 朱国和 | Method for recycling low-silicon high-calcium industrial waste materials and products prepared by method |
| CN103011706A (en) * | 2012-12-14 | 2013-04-03 | 海南蓝岛环保产业股份有限公司 | Concrete taking green mud and white mud as admixtures and preparation method for concrete |
| CN103011706B (en) * | 2012-12-14 | 2014-08-13 | 海南蓝岛环保产业股份有限公司 | Concrete taking green mud and white mud as admixtures and preparation method for concrete |
| CN103613111A (en) * | 2013-11-20 | 2014-03-05 | 四川银鸽竹浆纸业有限公司 | Method for producing lime by recovery of white clay with papermaking alkali |
| CN103613111B (en) * | 2013-11-20 | 2015-05-13 | 四川银鸽竹浆纸业有限公司 | Method for producing lime by recovery of white clay with papermaking alkali |
| CN106431097A (en) * | 2015-08-04 | 2017-02-22 | 海南金海浆纸业有限公司 | Preparation method of new material using papermaking waste mud and new material thereof |
| CN106396432A (en) * | 2016-08-31 | 2017-02-15 | 王桂林 | Method for recovering active lime from pulping and papermaking white mud |
| CN106518113A (en) * | 2016-11-06 | 2017-03-22 | 金少平 | Continuous casting tundish paint with good purification function and preparation method thereof |
| CN106518112A (en) * | 2016-11-06 | 2017-03-22 | 金少平 | Low-cost continuous casting tundish coating and preparation method thereof |
| CN107267119A (en) * | 2017-06-09 | 2017-10-20 | 烟台金奥冶炼有限公司 | A kind of cyanidation tailings produce the production method of sand-blasting abrasive |
| CN108609878A (en) * | 2018-05-29 | 2018-10-02 | 福建鼎盛元环保科技有限公司 | A kind of production line and its technique preparing aluminophosphates cementitious material using white clay |
| CN111348850A (en) * | 2018-12-21 | 2020-06-30 | 西南科技大学 | Hydraulic lime and production method thereof |
| CN114349446A (en) * | 2022-02-17 | 2022-04-15 | 广西科技大学 | Papermaking white mud aerated concrete and preparation method thereof |
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