CN105217671A - A kind of method utilizing carbide slag to prepare light calcium carbonate - Google Patents
A kind of method utilizing carbide slag to prepare light calcium carbonate Download PDFInfo
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Abstract
The invention discloses a kind of carbide slag resource utilization application novel method, by adding carbodiimide solution in carbide slag, especially, select the aqueous solution of carbonate or supercarbonate, stirring reaction aftertreatment obtains pale solid powder, then calcine, cooling, obtains light calcium carbonate after screening, and gained whiteness of low density calcium carbonate, purity and crystal formation are excellent, and particle diameter fine uniform, can be used as a large amount of being applied in building coating of a kind of filler.
Description
Technical field
The invention belongs to chemical production field, the light calcium carbonate that a kind of particularly method utilizing carbide slag to prepare light calcium carbonate, and the method prepares can as applying filler in building coating.
Background technology
Along with expanding economy, the shortage of the energy, the rise in price of oil, increases day by day to the demand of acetylene.And the most important source of acetylene is calcium carbide ore deposit.Be raw material with calcium carbide, the technique of producing acetylene of adding water is simply ripe, existing more than 60 year history so far.Still larger specific gravity is accounted at present in China.It after acetylene gas is that the waste residue of main component is called carbide slag with calcium hydroxide that calcium carbide hydrolysis obtains, the particle diameter of most particle between 10 ~ 50 microns, generally in scattered paste shape, poor fluidity.1 ton of standard calcium carbide is produced acetylene gas and is approximately produced 1.5 ~ 2 tons of carbide slags.Carbide slag main component is Ca (OH)
2, the oxide compound in addition containing silicon, iron, aluminium, magnesium etc., a small amount of sulfide, phosphide and acetylene gas, have strong basicity, and pH value is up to more than 12.From carbide-feed generator discharge carbide slag water content up to more than 90%.Carbide slag is as can not get appropriate process, and direct air storage, will take a large amount of soils, and pollutes environment around and waters.So the process of carbide slag is extremely urgent.At present, only some carbide slag is used for banketing and is used as ground or builds the road, and major part is all processed and utilize, and does not also have good treatment process both at home and abroad and makes the relevant report of its resource utilization.
In recent years, building developed into mainstay of the national economy industry already gradually, day by day increased the demand of building coating.We know that the main composition of building coating has filmogen, color stuffing and solvent and various auxiliary agents etc.And in engineering coating, the addition of color stuffing is especially up to more than 40%.If can carry out processing treatment to carbide slag and the major part replaced in building coating or all filler, then the consumption of carbide slag is considerable.This is one " turning waste into wealth ", and the good approach of recycling carbide slag, its economic implications and Significance for Environment are very great.Therefore, take carbide slag as the favor that raw material prepares that light calcium carbonate more and more receives people.
At present, with carbide slag be that the method that light calcium carbonate prepared by raw material has following two all:
1) by unslaked lime after carbide slag high-temperature calcination and water generation digestion reaction, then in Digestive system, carbon dioxide is passed into thus the calcium carbonate be precipitated.The quality of the calcium carbonate that this method prepares, whiteness and crystal formation are not fine.
2) amino acid is joined in carbide slag, the calcium hydroxide being slightly soluble in water in carbide slag is converted into amino acid calcium soluble in water, then regulate the pH value of amino acid calcium solution to be separated out with the form of precipitation by the impurity in solution, filter and pass into carbon dioxide in backward amino acid calcium solution and prepare calcium carbonate.This method is owing to using amino acid, and production cost is high, and requires high to the precision of pH value regulate process, and these are all unfavorable for Industry Promotion.
In addition, in above-mentioned two kinds of methods, be all prepare calcium carbonate by passing into carbon dioxide in solution, this operating procedure is complicated and high to matching requirements, improves the cost of enterprise.
In addition, also in some prior aries, by adding lipid acid as the effective calcium in extraction agent extraction carbide slag, then add carbodiimide solution and prepare calcium carbonate, because the solubleness of the higher fatty acid calcium from caproic acid calcium in water is deteriorated, therefore the use of lipid acid is restricted, and all irritant smells of lower fatty acid such as formic acid, acetic acid, propionic acid, vinylformic acid, can pollute, be unfavorable for environmental protection and HUMAN HEALTH.Meanwhile, by adding lipid acid as extraction agent, need the pH value of fine adjustment system when adding carbodiimide solution, therefore, require that operative's precision is high, complicated operation, these factors are all unfavorable for the Industry Promotion of the method.
Summary of the invention
In order to solve the problem, present inventor has performed and study with keen determination, found that: by adding carbodiimide solution in carbide slag, especially, select the aqueous solution of carbonate or supercarbonate, stirring reaction aftertreatment obtains pale solid powder, then calcine, cooling, obtains light calcium carbonate after screening, thus completes the present invention.
The object of the present invention is to provide a kind of method utilizing carbide slag to prepare light calcium carbonate, the method comprises the following steps:
1) carbide slag is cleaned with water;
2) in step 1) in cleaning after carbide slag in add carbonate or/and the aqueous solution of supercarbonate, centrifugally after stirring reaction obtain solid, then drying solid, obtain pale powder, wherein, carbonate is or/and the mass percent concentration of the aqueous solution of supercarbonate is 10% ~ 50%;
3) to step 2) in the pale powder of gained calcine, after calcining, cooling, obtains white powder;
4) to step 3) in the white powder of gained sieve, obtain lightweight carbonic acid acid calcium.
The light calcium carbonate that another object of the present invention is to provide a kind of method utilizing carbide slag to prepare light calcium carbonate to prepare is as the filler in building coating.
Another object of the present invention is to provide a kind of building coating, and this building coating is made up of the raw material comprising following parts by weight:
Benzene emulsion 90 ~ 120 parts, softening water 300 ~ 450 parts, light calcium carbonate 380 ~ 450 parts, titanium dioxide 80 ~ 120 parts, kaolin 20 ~ 50 parts, mica powder 5 ~ 15 parts, Natvosol 1.5 ~ 2.5 parts, wetting agent 0.5 ~ 1.5 part, dispersion agent 3 ~ 5 parts, defoamer 1 ~ 2.5 part, neutralizing agent 0.2 ~ 1 part, film coalescence aid 3 ~ 5 parts, alkali swelling class thickening material 0.8 ~ 1.5 part, polyurethane associative thickener 0.3 ~ 0.8 part, frostproofer 3 ~ 5 parts, anticorrosion and bactericidal agent 0.5 ~ 1 part, wherein, described light calcium carbonate is prepared by a kind of method utilizing carbide slag to prepare light calcium carbonate provided by the present invention.
Another object of the present invention is the preparation method providing a kind of building coating, and the method comprises the following steps:
A) in agitator, add the softening water of 300 ~ 450 parts, then in stirring, add the wetting agent of 0.5 ~ 1.5 part, the dispersion agent of 3 ~ 5 parts, the defoamer of 0.8 ~ 1.5 part, the neutralizing agent of 0.2 ~ 1 part, the Natvosol of 1 ~ 1.5 part, after stirring, the titanium dioxide adding 80 ~ 120 parts stirs;
B) to step a) in system in add the light calcium carbonate of 400 ~ 450 parts, in stirring, add the kaolin of 20 ~ 50 parts, the mica powder of 5 ~ 15 parts, the frostproofer of 3 ~ 5 parts, the film coalescence aid of 3 ~ 5 parts, stirs, wherein, described light calcium carbonate is prepared by a kind of method utilizing carbide slag to prepare light calcium carbonate provided by the present invention;
C) Natvosol taking 0.5 ~ 1 part joins step b) system in, stir, the benzene emulsion of 90 ~ 120 parts is added in stirring, the alkali swelling class thickening material of 0.8 ~ 1.5 part, the polyurethane associative thickener of 0.3 ~ 0.8 part, the defoamer of 0.2 ~ 1 part, the anticorrosion and bactericidal agent of 0.5 ~ 1 part, after stirring, obtain building coating.
The light calcium carbonate that method provided by the invention prepares, its whiteness is high, content is high, crystal formation is excellent, and particle diameter is tiny, evenly, can be used as filler a large amount of be applied in building coating, the excellent performance of the building coating of gained, in addition, the preparation method of building coating provided by the invention makes the stability in storage of the building coating finally obtained, the performance such as ageing-resistant more excellent.
Accompanying drawing explanation
Fig. 1 is the XRD spectra of carbide slag and the comparison diagram of JCPDS card;
Fig. 2 is the comparison diagram of XRD spectra by the preparation-obtained light calcium carbonate of embodiment 1 and JCPDS card.
Embodiment
Below by the present invention is described in detail, the features and advantages of the invention will illustrate along with these and become more clear, clear and definite.
According to an aspect of the present invention, provide a kind of method utilizing carbide slag to prepare light calcium carbonate, the method comprises the following steps:
1) carbide slag is cleaned with water;
2) in step 1) in cleaning after carbide slag in add carbonate or/and the aqueous solution of supercarbonate, centrifugally after stirring reaction obtain solid, then drying solid, obtain pale powder, wherein, carbonate is or/and the mass percent concentration of the aqueous solution of supercarbonate is 10% ~ 50%;
3) to step 2) in the pale powder of gained calcine, after calcining, cooling, obtains white powder;
4) to step 3) in the white powder of gained sieve, obtain lightweight carbonic acid acid calcium.
According to the present invention, in step 1) in, wash the water-soluble impurity in carbide slag with water, especially, with water to carbide slag cleaning repeatedly, most impurity can be washed away, thus avoid the impact of impurity on the productive rate of final product light calcium carbonate, whiteness, content and particle diameter.
According to the present invention, in step 2) in, carbodiimide solution stirring reaction is added in the carbide slag cleaned up, especially, select carbonate or/and the aqueous solution of supercarbonate joins in carbide slag as carbodiimide solution, then, under whipped state, calcium carbonate is generated with the main component calcium hydroxide reaction in carbide slag.The stirring reaction time is not restricted, and reaction occurs, preferably 0.3 ~ 12 hour, more preferably 0.5 ~ 6 hour.
In a preferred embodiment, carbonate or/and supercarbonate the aqueous solution in carbonate or/and in supercarbonate and carbide slag the mol ratio of calcium hydroxide be 1 ~ 10:1, preferably 1.5 ~ 3:1, wherein, the content of the calcium hydroxide in carbide slag can be measured by the method for acid base titration in advance.
According to the present invention, carbonate or/and the mass percent concentration preferably 10% ~ 50% of the aqueous solution of supercarbonate, more preferably 20% ~ 40%.
According to the present invention, carbonate and supercarbonate are not subject to the restriction of concrete kind, the aqueous solution such as salt of wormwood, sodium carbonate, volatile salt, saleratus, sodium bicarbonate, bicarbonate of ammonia.Especially, select volatile salt or/and the aqueous solution of bicarbonate of ammonia join in carbide slag with calcium hydroxide reaction, due to volatile salt or/and the ammoniacal liquor that produces in calcium hydroxide reaction process of bicarbonate of ammonia, directly can recycle, therefore avoid secondary pollution.
According to above-mentioned steps 2), add after carbodiimide solution stirring reaction completes, reaction system is centrifugal, especially, rotating speed is 2000 ~ 5000r/min, after elimination aqueous systems, solids component is dry, dry mode can be multiple, naturally dry or dry at a certain temperature, but the temperature of drying is preferably not more than the decomposition temperature of calcium carbonate, otherwise affect yield and the content of final product, the calcium carbonate of gray powdery is finally obtained after drying completes, owing to also there is the impurity such as some organism in calcium carbonate now, therefore content is not high, await further purification.
In step 2) in the particle diameter of the calcium carbonate of gray powdery that obtains below 50 microns.
According to the present invention, in order to obtain whiteness, crystal formation is excellent and content is high light calcium carbonate, by above-mentioned steps 2) in the pale powder that finally obtains calcine, in the process of calcining, the organism in pale powder can be removed, meanwhile, make the whiteness of calcium carbonate and crystal formation better.
In a preferred embodiment, the gray powdery calcium carbonate finally obtained is calcined under the temperature condition of 200 ~ 800 DEG C, in this temperature range, under ensureing the Undec prerequisite of calcium carbonate, effective decomposition to eliminate in pale powder contained organic impurities, if temperature is lower than 200 DEG C, then and can not effectively removing organic impurities, then can affect the quality of final light calcium carbonate, as content, whiteness etc.Especially, be preferably 300 ~ 600 DEG C, better can remove impurity.Wherein, calcination time is preferably 1 ~ 15 hour, more preferably 2 ~ 10 hours.
In described step 3) in, the calcium carbonate of gray powdery is after calcining, and cooling, obtain the calcium carbonate of white powder, particle diameter, even can below 20 microns below 30 microns.Wherein, the mode of cooling is not restricted, naturally cooling, or adopts manual type to force cooling, especially, and preferred naturally cooling cooling.
According to the present invention, to above-mentioned steps 3) in the white powder of gained sieve, especially, 800 mesh sieves are selected to divide, obtain evengranular light calcium carbonate, and the particle diameter of the light calcium carbonate obtained is below 25 microns, even can reach less than 20 microns, preparation-obtained light calcium carbonate content is up to more than 93%.
According to a further aspect in the invention, the light calcium carbonate prepared by method provided by the present invention is because its whiteness is high, content is high and crystal formation is excellent, therefore of many uses, especially, can be used as a kind of applying filler in building coating.
In accordance with a further aspect of the present invention, provide a kind of building coating, this building coating is made up of the raw material comprising following parts by weight:
Benzene emulsion 90 ~ 120 parts, softening water 300 ~ 450 parts, light calcium carbonate 400 ~ 450 parts, titanium dioxide 80 ~ 120 parts, kaolin 20 ~ 50 parts, mica powder 5 ~ 15 parts, Natvosol 1.5 ~ 2.5 parts, wetting agent 0.5 ~ 1.5 part, dispersion agent 3 ~ 5 parts, defoamer 1 ~ 2.5 part, neutralizing agent 0.2 ~ 1 part, film coalescence aid 3 ~ 5 parts, alkali swelling class thickening material 0.8 ~ 1.5 part, polyurethane associative thickener 0.3 ~ 0.8 part, frostproofer 3 ~ 5 parts, anticorrosion and bactericidal agent 0.5 ~ 1 part, wherein, described light calcium carbonate is prepared by the method utilizing carbide slag to prepare light calcium carbonate provided by the present invention.
In a preferred embodiment, a kind of building coating is made up of the raw material comprising following parts by weight:
Benzene emulsion 100 parts, softening water 400 parts, light calcium carbonate 400 parts, titanium dioxide 100 parts, kaolin 30 parts, mica powder 10 parts, Natvosol 2 parts, wetting agent 1 part, dispersion agent 4 parts, defoamer 1.5 parts, neutralizing agent 0.5 part, film coalescence aid 4 parts, alkali swelling class thickening material 1 part, polyurethane associative thickener 0.5 part, frostproofer 4 parts, anticorrosion and bactericidal agent 1 part, wherein, described light calcium carbonate is prepared by a kind of method utilizing carbide slag to prepare light calcium carbonate provided by the present invention.
According to the above-mentioned building coating provided, wherein, the neutralizing agent of the preferred weak base class of neutralizing agent, especially, one or more in preferred ammoniacal liquor, thanomin, diethanolamine, trolamine, make the stability of coating reach best.
In above-mentioned building coating, Natvosol joins in system as the water miscible non-ionic celluloses ether class of one, while the viscosity of regulation system, can also make the dispersiveness of system and stability better.
In above-mentioned building coating, especially, when alkali swelling class thickening material is 1 part, when polyurethane associative thickener is 0.5 part, building coating sag prevention performance and water tolerance is made to reach best.
According to the present invention, a large amount of light calcium carbonates is with the addition of as filler in benzene emulsion, and because light calcium carbonate for this reason utilizes the waste residue carbide slag of high pollution to prepare as raw material, therefore, the production cost of lightweight carbonic acid can be reduced significantly, in addition, because carbide slag alkalescence is high, if be deposited in open air, severe contamination environment and water source, therefore, the light calcium carbonate obtained after carbide slag process is applied in building coating efficiently solves environmental problem.
In addition, the building coating that the present invention carries, solid content is high, modest viscosity, and therefore production efficiency is high, and transportation cost is low, and in use, rate of drying is fast, constructs more convenient, fast drying, low power consumption and other advantages simultaneously.
In a preferred embodiment, described building coating is prepared by following steps:
A) in agitator, add the softening water of 300 ~ 450 parts, then in stirring, add the wetting agent of 0.5 ~ 1.5 part, the dispersion agent of 3 ~ 5 parts, the defoamer of 0.8 ~ 1.5 part, the neutralizing agent of 0.2 ~ 1 part, the Natvosol of 1 ~ 1.5 part, after stirring, the titanium dioxide adding 80 ~ 120 parts stirs;
B) to step a) in system in add the light calcium carbonate of 400 ~ 450 parts, in stirring, add the kaolin of 20 ~ 50 parts, the mica powder of 5 ~ 15 parts, the frostproofer of 3 ~ 5 parts, the film coalescence aid of 3 ~ 5 parts, stirs, wherein, light calcium carbonate is prepared by the method utilizing carbide slag to prepare light calcium carbonate provided by the present invention;
C) Natvosol taking 0.5 ~ 1 part joins step b) system in, stir, the benzene emulsion of 90 ~ 120 parts is added in stirring, the alkali swelling class thickening material of 0.8 ~ 1.5 part, the polyurethane associative thickener of 0.3 ~ 0.8 part, the defoamer of 0.2 ~ 1 part, the anticorrosion and bactericidal agent of 0.5 ~ 1 part, after stirring, obtain building coating.
Above-mentioned steps a) in, rotating speed is preferably 600r/min, when adding titanium dioxide, in order to improve dispersiveness, can be 1000r/min by adjustment of rotational speed.
At above-mentioned steps b) in, kaolin preferably calcine after kaolin, the performances such as the intensity after coating film forming, wear resistance can be promoted.In this step, be preferably stirring system under the condition of 1000r/min at rotating speed, filler is disperseed fully.
At above-mentioned steps c) in, rotating speed is preferably 600r/min, after stirring, obtains building coating.
Prepare in the method for building coating above-mentioned, before Natvosol adds system, first fully can dissolve with softening water, and then join in system, Natvosol is fully scatter.
Study discovery through the present inventor, Natvosol is divided into two portions and joins respectively in system, can reach best effect.First, step a) in, add part Natvosol, the viscosity of regulation system that can be appropriate, the dispersiveness of filler can not be affected again because of the increasing of viscosity, until step a) and step b) in the raw material stirring of adding evenly after, in step c) in add another part Natvosol, under making not affect completely the prerequisite of other stock dispersion, particularly do not affect the dispersiveness of filler, make the viscosity that system finally reaches suitable, thus the flow that less coating produces because viscosity is improper when use procedure.
After testing building coating provided by the present invention according to national standard G/T24-2000, its water tolerance, ultra-violet resistance, ageing resistance, the properties such as stability in storage all conform with the regulations.Therefore, the light calcium carbonate obtained by preparation method provided by the present invention meets application standard completely.
Comprehensive, the method utilizing carbide slag to prepare light calcium carbonate provided by the present invention, has following beneficial effect:
1, whole operating procedure is simple, and the carbodiimide solution used is cheap, and at easy handling, and the light calcium carbonate productive rate that obtains of present method is high simultaneously, and cost is low, and these factors are all conducive to the popularization of industrialization;
2, utilize carbide slag to prepare light calcium carbonate, make the utilization that the refuse of high pollution obtains again, in addition, in whole production technique, the by product ammoniacal liquor of generation can directly be recycled, and avoids secondary pollution, therefore environmental protection more;
3, employ the light calcium carbonate obtained by carbide slag process in a large number in building coating provided by the invention, under the prerequisite of guaranteed performance excellence, the cost of the building coating of gained is lower.
4, the preparation method of building coating provided by the invention, makes the stability in storage of the building coating finally obtained, the performance such as ageing-resistant more excellent.
embodiment
The present invention is further described below by way of specific examples.But these examples are only exemplary, do not form any restriction to protection scope of the present invention.
In following embodiment and comparative example:
Carbide slag is the mine tailing of acetylene gas company, wherein, X-ray diffraction is carried out to carbide slag, obtain the XRD spectra of carbide slag, after contrasting with JCPDS card, as shown in Figure 1, learn that the most of material in carbide slag is calcium hydroxide, meanwhile, be 89.3% by the content of determination of acid-basetitration calcium hydroxide;
Other raw materials are the product of being purchased.
Embodiment 1
prepare light calcium carbonate
1) take the carbide slag of 1000g, clean carbide slag twice with water;
2) sal volatile is prepared: in reaction vessels, add 2000g water, then add 1000g volatile salt solid, stir, make the aqueous solution that mass percent concentration is 33.3%;
3) ammonium carbonate solution prepared is joined in the carbide slag after cleaning, under the rotating speed of 3000r/min, stirring reaction 0.5 hour, stirring reaction is after 0.5 hour, centrifugally in centrifuges obtain solid, solid is put into 105 DEG C, baking oven to dry 3 hours, obtain pale powder, by product ammoniacal liquor is directly recycled;
4) obtained pale powder is put into retort furnace to calcine, at the temperature lower calcination 2 hours of 500 DEG C, then naturally cooling, obtains white powder;
5) cross 800 mesh sieves to sieve white powder, obtaining white powder solid after screening is 960g.
Carry out X-ray diffraction to the light calcium carbonate that the present embodiment prepares, obtain its XRD spectra, after contrasting, can draw with JCPDS card, preparation-obtained material is calcium carbonate, and meanwhile, the material of the overwhelming majority is calcium carbonate, shows that content is high.
In addition, the productive rate of the light calcium carbonate that the present embodiment prepares is 92.3%, and content is 97.1%, and particle diameter is less than 20 microns.
Embodiment 2
prepare light calcium carbonate
1) take the carbide slag of 1000g, clean carbide slag twice with water;
2) ammonium bicarbonate soln is prepared: in reaction vessels, add 2000g water, then add 1000g volatile salt solid, stir, make the aqueous solution that mass percent concentration is 33.3%;
3) ammonium carbonate solution prepared is joined in the carbide slag after cleaning, under the rotating speed of 3000r/min, stirring reaction 0.5 hour, stirring reaction is after 0.5 hour, centrifugally in centrifuges obtain solid, solid is put into 105 DEG C, baking oven to dry 3 hours, obtain pale powder, by product ammoniacal liquor is directly recycled;
4) obtained pale powder is put into retort furnace to calcine, at the temperature lower calcination 2 hours of 500 DEG C, then naturally cooling, obtains white powder;
5) cross 800 mesh sieves to sieve white powder, obtain the light calcium carbonate 1198g of white after screening, productive rate 93.7%, content is 95.1%, and particle diameter is less than 20 microns
Embodiment 3
prepare light calcium carbonate
1) take the carbide slag of 1000g, clean carbide slag twice with water;
2) sal volatile is prepared: in reaction vessels, add 4000g water, then add 1000g volatile salt solid, stir, make the aqueous solution that mass percent concentration is 20%;
3) ammonium carbonate solution prepared is joined in the carbide slag after cleaning, under the rotating speed of 2000r/min, stirring reaction 2 hours, stirring reaction is after 2 hours, centrifugally in centrifuges obtain solid, solid is put into 105 DEG C, baking oven to dry 3 hours, obtain pale powder, by product ammoniacal liquor is directly recycled;
4) obtained pale powder is put into retort furnace to calcine, at the temperature lower calcination 2 hours of 200 DEG C, then naturally cooling, obtains white powder;
5) cross 800 mesh sieves to sieve white powder, obtain the light calcium carbonate 955g of white after screening, productive rate 91.7%, content is 93.7%, and particle diameter is less than 25 microns
Embodiment 4
prepare building coating
A) the light calcium carbonate 400g taking gained in embodiment 1 is for subsequent use;
B) in agitator, add softening water 400g, rotating speed is 600r/min, adds wetting agent 1.0g, stir 10min, add dispersion agent 4.0g, stir 10min, add defoamer 1g, stir 10min, add thanomin 0.5g, stir 10min, weigh Natvosol 1.2g, add in agitator after dissolving with 20g softening water, stir 30 minutes, be, after 1000r/min, add titanium dioxide 100g by adjustment of rotational speed, stir 30 minutes;
C) to step 2) system in add the 400g light calcium carbonate taken, stir 30 minutes, add calcined kaolin 30g, stir 20 minutes, add mica powder 10g, stir 30 minutes, add frostproofer 4g, stir 10min, add film coalescence aid 4g, stir 10min;
D) again weigh Natvosol 0.8g, add in agitator after softening water-soluble opening with 10g, stir 20 minutes, be 600r/min by adjustment of rotational speed, add benzene emulsion 100g, stir 30 minutes, add alkali swelling class thickening material 1g, stir 10min, add polyurethane associative thickener 0.5g, stir 10min, add defoamer 0.5g, stir 10min, add anticorrosion and bactericidal agent 1.0g, finally stir 30 minutes, finally obtain the about 1080g of coating, solid content is 60.2%, and viscosity is 97KU.
Embodiment 5
prepare building coating
A) the light calcium carbonate 450g taking gained in embodiment 2 is for subsequent use;
B) in agitator, add softening water 400g, rotating speed is 600r/min, adds wetting agent 1.0g, stir 10min, add dispersion agent 4.0g, stir 10min, add defoamer 1g, stir 10min, add ammoniacal liquor 0.5g, stir 10min, weigh Natvosol 1.2g, add in agitator after dissolving with 20g softening water, stir 30 minutes, be, after 1000r/min, add titanium dioxide 100g by adjustment of rotational speed, stir 30 minutes;
C) to step 2) system in add the 400g light calcium carbonate taken, stir 30 minutes, add calcined kaolin 30g, stir 20 minutes, add mica powder 10g, stir 30 minutes, add frostproofer 4g, stir 10min, add film coalescence aid 4g, stir 10min;
D) again weigh Natvosol 0.8g, add in agitator after softening water-soluble opening with 10g, stir 20 minutes, be 600r/min by adjustment of rotational speed, add benzene emulsion 100g, stir 30 minutes, add alkali swelling class thickening material 1g, stir 10min, add polyurethane associative thickener 0.5g, stir 10min, add defoamer 0.5g, stir 10min, add anticorrosion and bactericidal agent 1.0g, finally stir 30 minutes, finally obtain the about 1130g of coating, solid content is 61.9%, and viscosity is 100KU.
Embodiment 6
prepare building coating
A) the light calcium carbonate 400g taking gained in embodiment 3 is for subsequent use;
B) in agitator, add softening water 300g, rotating speed is 600r/min, adds wetting agent 0.5g, stir 10min, add dispersion agent 3g, stir 10min, add defoamer 0.8g, stir 10min, add ammoniacal liquor 0.2g, stir 10min, weigh Natvosol 1g, add in agitator after dissolving with 10g softening water, stir 30 minutes, be, after 1000r/min, add titanium dioxide 80g by adjustment of rotational speed, stir 30 minutes;
C) to step 2) system in add the 400g light calcium carbonate taken, stir 30 minutes, add calcined kaolin 20g, stir 20 minutes, add mica powder 5g, stir 30 minutes, add frostproofer 4g, stir 10min, add film coalescence aid 3g, stir 10min;
D) again weigh Natvosol 0.5g, add in agitator after softening water-soluble opening with 5g, stir 20 minutes, be 600r/min by adjustment of rotational speed, add benzene emulsion 90g, stir 30 minutes, add alkali swelling class thickening material 0.8g, stir 10min, add polyurethane associative thickener 0.3g, stir 10min, add defoamer 0.2g, stir 10min, add anticorrosion and bactericidal agent 0.5g, finally stir 30 minutes, finally obtain the about 923g of coating, solid content is 65.8%, and viscosity is 103KU.
Comparative example 1
Repeat embodiment 4, wherein, by steps d) in the Natvosol of 0.8g dissolve together with the Natvosol of the 1.2g in step b) add described step b to) in system in, all the other conditions are all constant.
Gained dope viscosity is large, and the light calcium carbonate added can not get good dispersion, and paint stability is poor, easy layering.
Comparative example 2
Repeat embodiment 1, wherein, the temperature of calcining is 150 DEG C, and all the other conditions are all constant, productive rate 95%, and content is 89.7%.
test example
test example 1
According to following methods: respectively in Example 1 ~ 3, comparative example 2 and the light calcium carbonate bought same weight light calcium carbonate after, the water adding certainweight is made thick, and then blade coating, on blank sheet of paper, dries rear comparison respectively.
The whiteness comparison after blade coating with standard light calcium carbonate after blade coating by embodiment 1 ~ 3 and comparative example 2 gained light calcium carbonate, result is as shown in table 1:
Table 1
test example 2
According to G/T24-2000, carry out correlated performance test to the building coating of gained in embodiment 4 ~ 6, result is as shown in table 2:
Table 2
More than in conjunction with embodiment and exemplary example to invention has been detailed description, but these explanations can not be interpreted as limitation of the present invention.It will be appreciated by those skilled in the art that when not departing from spirit and scope of the invention, can carry out multiple equivalencing, modification or improvement to technical solution of the present invention and embodiment thereof, these all fall within the scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. utilize carbide slag to prepare a method for light calcium carbonate, the method comprises the following steps:
1) carbide slag is cleaned with water;
2) in step 1) in cleaning after carbide slag in add carbonate or/and the aqueous solution of supercarbonate, centrifugally after stirring reaction obtain solid, then drying solid, obtain pale powder, wherein, carbonate is or/and the mass percent concentration of the aqueous solution of supercarbonate is 10% ~ 50%;
3) to step 2) in the pale powder of gained calcine, after calcining, cooling, obtains white powder;
4) to step 3) in the white powder of gained sieve, obtain lightweight carbonic acid acid calcium.
2. method according to claim 1, wherein, described step 2) in carbonate or/and the aqueous solution of supercarbonate is preferably volatile salt or/and the aqueous solution of bicarbonate of ammonia.
3. method according to claim 1, wherein, described step 2) in carbonate or/and the mass percent concentration of the aqueous solution of supercarbonate is 20% ~ 40%.
4. method according to claim 1, wherein, the carbonate in the described aqueous solution or/and in supercarbonate and carbide slag the mol ratio of calcium hydroxide be 1 ~ 10:1, preferably 1.5 ~ 3:1, wherein, the content of the calcium hydroxide in carbide slag can be measured by the method for acid base titration in advance.
5. method according to claim 1, wherein, add carbonate or/and supercarbonate the aqueous solution after, under the rotating speed of 2000 ~ 5000r/min, stirring reaction 0.3 ~ 12 hour, centrifugal, the solid obtained after drying is at the temperature lower calcination 1 ~ 15 hour of 200 ~ 800 DEG C.
6. method according to claim 1, wherein, in step 4) in the particle diameter of light calcium carbonate of gained below 25 microns.
7. method according to claim 1, wherein, described light calcium carbonate is as the filler in building coating.
8. a building coating, wherein, this coating is made up of the raw material comprising following parts by weight:
Benzene emulsion 90 ~ 120 parts, softening water 300 ~ 450 parts, light calcium carbonate 400 ~ 450 parts, titanium dioxide 80 ~ 120 parts, kaolin 20 ~ 50 parts, mica powder 5 ~ 15 parts, Natvosol 1.5 ~ 2.5 parts, wetting agent 0.5 ~ 1.5 part, dispersion agent 3 ~ 5 parts, defoamer 1 ~ 2.5 part, neutralizing agent 0.2 ~ 1 part, film coalescence aid 3 ~ 5 parts, alkali swelling class thickening material 0.8 ~ 1.5 part, polyurethane associative thickener 0.3 ~ 0.8 part, frostproofer 3 ~ 5 parts, anticorrosion and bactericidal agent 0.5 ~ 1 part, wherein, described light calcium carbonate prepares for the method according to any one of Claims 1 to 4.
9. building coating according to claim 8, wherein,
Benzene emulsion 100 parts, softening water 400 parts, light calcium carbonate 400 parts, titanium dioxide 100 parts, kaolin 30 parts, mica powder 10 parts, Natvosol 2 parts, wetting agent 1 part, dispersion agent 4 parts, defoamer 1.5 parts, neutralizing agent 0.5 part, film coalescence aid 4 parts, alkali swelling class thickening material 1 part, polyurethane associative thickener 0.5 part, frostproofer 4 parts, anticorrosion and bactericidal agent 1 part, wherein, described light calcium carbonate prepares for the method according to any one of Claims 1 to 4, described neutralizing agent is ammoniacal liquor, thanomin, diethanolamine, one or more in trolamine.
10. the building coating described according to Claim 8 ~ 9 any one, wherein, this coating is prepared by following steps:
A) in agitator, add the softening water of 300 ~ 450 parts, then in stirring, add the wetting agent of 0.5 ~ 1.5 part, the dispersion agent of 3 ~ 5 parts, the defoamer of 0.8 ~ 1.5 part, the neutralizing agent of 0.2 ~ 1 part, the Natvosol of 1 ~ 1.5 part, after stirring, the titanium dioxide adding 80 ~ 120 parts stirs;
B) to step a) in system in add the light calcium carbonate of 400 ~ 450 parts, in stirring, add the kaolin of 20 ~ 50 parts, the mica powder of 5 ~ 15 parts, the frostproofer of 3 ~ 5 parts, the film coalescence aid of 3 ~ 5 parts, stirs, wherein, described light calcium carbonate prepares for the method according to any one of Claims 1 to 4;
C) Natvosol taking 0.5 ~ 1 part joins step b) system in, stir, the benzene emulsion of 90 ~ 120 parts is added in stirring, the alkali swelling class thickening material of 0.8 ~ 1.5 part, the polyurethane associative thickener of 0.3 ~ 0.8 part, the defoamer of 0.2 ~ 1 part, the anticorrosion and bactericidal agent of 0.5 ~ 1 part, after stirring, obtain building coating.
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