CN101993104A - Novel method for producing superfine calcium carbonate by using carbide slag as raw material - Google Patents
Novel method for producing superfine calcium carbonate by using carbide slag as raw material Download PDFInfo
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- CN101993104A CN101993104A CN2009100914308A CN200910091430A CN101993104A CN 101993104 A CN101993104 A CN 101993104A CN 2009100914308 A CN2009100914308 A CN 2009100914308A CN 200910091430 A CN200910091430 A CN 200910091430A CN 101993104 A CN101993104 A CN 101993104A
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Abstract
The invention relates to a method for preparing superfine calcium carbonate by adopting glycine as a dissolving agent, a modifying agent and an acid-binding agent, extracting effective calcium from calcium sources, such as carbide slag or lime, and the like and charging carbon dioxide into a reactor for calcifying, filtering and washing and application of the superfine calcium carbonate to paper making, paint production, and the like.
Description
Technical field
The present invention relates to a kind of employing glycine as solvating agent, properties-correcting agent and acid binding agent, from calcium sources such as carbide slag or lime, extract effective calcium, in reactor, feed carbonic acid gas and carry out calcification, filter, washing, prepare the method for super fine calcium carbonate, and the application of described super fine calcium carbonate in papermaking and coating etc. are produced.
Background technology
Carbide slag is the waste residue of carbide of calcium after acetylene gas is produced in hydrolysis, and main component is a calcium hydroxide, also contains a spot of silicon, iron, aluminium, calcium, magnesium and carbon slag.Because its composition is comparatively complicated, and has stink, and environment has been caused the serious environmental pollution, is the emphasis and the difficult point of China's cleaner production and resource circulation utilization.At present there are following problems in Comprehensive Utilization for Carbide Slag: as sweetening agent, consumption is too little; Produce materials for walls such as hollow brick, added value is lower, and market outlook are not clear, and the calcium carbide quantity of slag of actual consumption is limited; Produce cement, because technology is still immature, bigger to the product quality influence, added value is not high; Produce light calcium carbonate, the color that energy consumption height, carbide slag are brought into and impurity effect product quality as the calcium source.Therefore, Development and Production technology is simple, and cost is low, the added value of product height, can extensively promote, the new technology of mass consumption carbide slag, have important economy, society, environmental benefit.
Whiteness height, particle diameter are little, good dispersity, calcium carbonate powder material that cost is low have very big application value, and particularly the application prospect in fields such as papermaking, coating, plastics, rubber, feed, foodstuff additive, toothpaste is extensive, has a high potential.Therefore be the calcium source with the carbide slag, seek that cost is low, the Technology of clean environment firendly, solve the problem of energy consumption height, product quality difference, production meets the lime carbonate of service requirements, be the optimal path of realizing the carbide slag high value added utilization, have remarkable economic efficiency, social benefit and environmental benefit.
The experience of inventor's collection research for many years; through testing in large quantities and process optimization; collect engineering and technology experience for many years; to have invented a production technique simple original; cost is low; it is low to consume energy; environmental protection; it is better that large-scale production goes out economic worth; the glycine method that use properties more is better than fine calcium carbonate prepares on the novel technique basis of super fine calcium carbonate; by controlling for the condition in the carbonation reaction; making the super fine calcium carbonate that makes form the coalescence body can directly filter out with existing filter plant; the super fine calcium carbonate lotion that obtains can be directly stable with its dispersion and dispersion back storge quality with mechanical means; can directly apply in the coating preparation; also can directly apply in the papermaking, perhaps be applied to rubber after the drying; other need add plastics etc. in the industry of lime carbonate.This technology has realized the mass-producing utilization of carbide slag high added value, for low-cost, suitability for industrialized production super fine calcium carbonate lotion are applied to provide in the water-based system possibility, has huge economic benefit and market outlook.
Summary of the invention
The present invention has generated the solubility Calcium glycinate with glycine dissolving carbide slag and has separated with other inorganic impurities having invented, feeding carbonic acid gas prepares on the basis of novel method of lime carbonate, surprised discovery not only can reach uniform nano-grade size with the lime carbonate that glycine method obtains, and be agglomerated into the spheric aggregate easily, and in the crystallisation process, reaction equipment, feed concentration have remarkable influence to the shape of lime carbonate crystal formation, the size of nucleus.Discover that further Calcium glycinate solution is at interior circulation in the tower or still formula ultrasonic reactor, can obtain the uniform calcium carbonate microparticle of nano level particle diameter, can form coacervate under certain pH value, its controllable size is built in 1-10 μ m (seeing Figure of description 1).Find that by furtheing investigate us the carbonization process of lime carbonate is a process that generates and progressively grow up along with the lime carbonate nucleus, under equipment of the present invention and processing condition, can control growing up of lime carbonate and form the crystallite of nano-grade size, and the pH value is to the coalescence important influence of fine calcium carbonate particle, carrying out along with reaction, reaction was near terminal point when the pH value was reduced to 7.5-8.5, but this moment, lime carbonate existed with nano-form, can't effectively filter, but when adjusting pH value drops to 6-7, particle is coalescence rapidly, be agglomerated into easy filtering mean sizes at the coalescence body more than 10 microns (seeing Figure of description 2), this great separation that is found to be nano-calcium carbonate provides great convenience, this about 10 microns coacervate can be used plate filter easily, equipment such as whizzer filter, and obtain water content less than 50% lotion.This lotion can reduce aggregation size (seeing Figure of description 3) by mechanical means such as simple grinding or high speed dispersion, because the lime carbonate that generates has the modifying function of globosity and glycine, storge quality is stable, the change of size in storage process little (seeing Figure of description 4).Therefore be convenient to filter by its aggregated particle size of pH value control, can be easy after filtration it be disperseed with mechanical means is directly used in the water-based systems such as coating, papermaking, also can be used for oiliness systems such as plastics and rubber after the drying.
We find that under study for action the particle diameter of lime carbonate is thin more, and size distribution is narrow more, and then result of use is good more, but addition is big more, particularly the hiding rare in the coating, dispersiveness is improved a lot.We find further to study the application of super fine calcium carbonate lotion in coating, because the lime carbonate that the effect of glycine generates has the modular construction of nanoparticle and can assemble in a large number for presenting the globular coacervate, it is thin to have particle diameter after it is disperseed with mechanical means, the advantage of narrow distribution range (seeing Figure of description 5), not only nano effect be can embody according to using with the different of treatment condition, the effect of filler or the joint effect of the two also can be embodied.Substitute every performances such as the hiding rare of the prepared new coating of high-grade powders such as expensive titanium dioxide, superfine talcum powder in the coating and washability all has greatly improved with this lotion, can develop make new advances more cheap and the coating of excellent performance, thereby make the present invention have bigger marketable value.
Super fine calcium carbonate of the present invention, its coacervate median size are 1-10 μ m, and 99% size distribution is between 0.1-25 μ m.
Technical solution of the present invention can realize according to following mode:
The super fine calcium carbonate preparation:
1), carry calcium: under the normal temperature, the calcium hydroxide reaction in glycine and the carbide slag.
Ca(OH)
2+NH
2CHRCOOH→(NH
2CHRCOO)
2Ca+H
2O
The calcium hydroxide that is slightly soluble in water is converted into water miscible Calcium glycinate, impurities in the filtering carbide slag, the calcium extraction yield can reach more than 93%.
2), carbonization: above-mentioned Calcium glycinate filtrate is placed interior circulation still formula or tower reactor with ultrasonic generating unit, feed carbonic acid gas, when the pH value descends 7 when following, when being preferably 6-7, finish reaction, the super fine calcium carbonate that obtains can be preferably settling centrifuge and filter directly with having for example filter plant such as plate filter, whizzer of filter plant now, and the glycin mother liquid recycled after the filtration is in the dissolution process of carbide slag.
(NH
2CHRCOO)
2Ca+CO
2→CaCO
3+NH
2CHRCOOH
3), washing: the lotion for preparing with an amount of water washing, is obtained content and be about 50% superfine lotion lime carbonate, and wash water is recyclable to be applied mechanically.
Super fine calcium carbonate is used:
Directly apply in coating and the papermaking after the calcium carbonate product for preparing disperseed with mechanical system, with commercially available lime carbonate as a comparison, estimate the use properties of lime carbonate according to examination criteria.
The inventive method can adopt following specific embodiments:
With certain density glycine solution and carbide slag according to certain material mixed, be reacted to reaction end at normal temperatures after, filtering separation promptly obtains Calcium glycinate solution.Wherein, the concentration of glycine solution can be preferably 10-20% from extremely rare to saturated; The material mole proportion optimization of carbide slag and glycine is 1: 1-2.5; Temperature of reaction is 0-100 ℃, is preferably normal temperature; Reaction times is preferably about 1h, and glycine can reach more than 93% the calcium extraction yield of carbide slag.Carry filter residue behind the calcium and can make the usefulness of coating putty filler and cement additire.
Place reactor to blast carbonic acid gas Calcium glycinate solution, after reaction is reached home at a certain temperature, filter, wash, promptly get white fine calcium carbonate lotion, the glycin mother liquid recycled.Wherein, gas concentration lwevel can be 1%-100%, preferred boiler exhaust gas or other stack gas concentration (about 20%); Temperature of reaction is 0-100 ℃, is preferably normal temperature; Reaction end is that the pH value is controlled at less than 7, is preferably 6-7; Reactor can be interior circulation still formula or tower ultrasonic reactor, the tower ultrasonic reactor of circulation in being preferably; Filter filter plants such as available plate filter, whizzer, be preferably the big equipment of treatment capacity such as settling centrifuge.
The lotion that makes is washed, and wash water is applied mechanically, and disperses with mechanical system then, obtains ultramicrofine calcium carbonate product, and product can directly add in coating and the papermaking as fine particle calcium carbonate, also can be used for the industry that other need add lime carbonate after the drying.Wherein, the mass ratio of wash water and lime carbonate lotion is preferred 3: 1; The mechanical dispersion mode can be with existing any mechanical dispersion mode, preferred high speed dispersor; The lime carbonate lotion can be directly used in the various water-based systems, in preferred coatings and the papermaking.The super fine calcium carbonate lotion water content that the inventive method prepares 50%, pH value 6-8, be ball shaped nano grade particles coacervate, product is checked (see: the calcium carbonate product performance index detect) by analysis, meet relevant industries standard (HG2226-2000) fully, can directly apply in the water-based systems such as papermaking, coating, also can be used for oiliness systems such as rubber, plastics after the drying.
Below for producing a kind of prescription of coating.
The inventive method is applicable to that also with lime (for example unslaked lime, white lime) be in the system in calcium source obviously, can reach higher quality requirements such as whiteness, purity, fineness, modification.
The inventive method has following characteristics:
The present invention removes its indissoluble impurity in effective calcium component and separation that glycine extracts in the carbide slag, carbonization obtains on the basis of high-purity super fine lime carbonate novel process, tower or the interior circulation tank reactor of circulation in utilizing, the lime carbonate particle diameter that control generates under ultrasound condition remains on nano level, the super fine calcium carbonate particle agglomeration after-filtration separation that generates by the pH value of regulating carburizing reagent obtains the lime carbonate lotion, the lotion that obtains obtains super fine calcium carbonate after can disperseing by simple mechanical means, it is little that this product has a particle diameter, specific surface area is big, good dispersity, storge quality is stable, be easy to characteristics such as dispersion, can be directly used in instead of titanium white powder in the coating preparation, high order is counted high-grade powders such as talcum powder, reduce the coating material production cost, reduce the dust pollution in the production process, also can be used for being used for plastics after papermaking or the drying, rubber etc. need to add in the industry of lime carbonate.This method not only can mass-producing, the processing carbide slag of high added value; effectively solve the pollution problem of carbide slag to environment; provide and realized that base unit is the industrialization possibility of the lime carbonate of Nano grade; also conditions such as pH value in reaction are disperseed easily by controlling, storge quality is stable, segregative nano-calcium carbonate coacervate, and it is directly used in aqueous systems in a plurality of industries such as coating, papermaking becomes possibility.It is extensive that this invention achievement has not only solved carbide slag; the low-cost technical barrier of using; and developed the new industrial synthesis of nanometer grade calcium carbonate; the stability and the excellent Practical Performance of obtained lotion have been found; captured the resource utilization of troubling carbide slag refuse; nano-calcium carbonate is difficult to large-scale production; produce nano-calcium carbonate and need difficulties such as the isolating high energy consumption of spraying drying; simultaneously also having solved lotion lime carbonate lumps easily; be difficult to the difficult problem that commercialization is used; saved oven dry; packing cost; the powder that has reduced environment pollutes; more meet cleaner production; the requirements of green environmental protection of energy-saving consumption-reducing, so the present invention has novelty; advance and practicality.
This technological process is simple, less investment, and the added value of product height both can effectively utilize the three wastes, reached the purpose of cleaner production, the utilization of resources again, not only can avoid a large amount of greenhouse gases CO in the existing fine particle calcium carbonate production process
2Discharging and huge energy consumption, and can utilize CO
2Reach the useless carbide slags of up to ten million tons and produce the super fine calcium carbonate lotion of added value height, stable performance, can reduce the cost that needs to add the lime carbonate relevant industries greatly, promote its product performance, have good environmental benefit, economic benefit and social benefit.
Description of drawings
Accompanying drawing 1 is the super fine calcium carbonate sem photograph of glycine technology preparation.
Accompanying drawing 2 is the change of size figure in the carbonization process.
Accompanying drawing 3 is the change of size figure of lime carbonate lotion process of lapping.
Accompanying drawing 4 is the change of size figure in the storage of lime carbonate lotion.
Accompanying drawing 5 is the size distribution figure of lime carbonate lotion.
Accompanying drawing 6 is the sem photograph of common commercially available lime carbonate.
Embodiment
The present invention can be further described with indefiniteness embodiment hereinafter.
The preparation of super fine calcium carbonate
Embodiment 1: the Calcium glycinate extracting solution logical carbonic acid gas carbonization in interior circulation tank reactor (being with ultrasonic) that generates with glycine and carbide slag reaction prepares super fine calcium carbonate
1.45L water is joined in the reactor, add 140g glycine (technical grade) again, be stirred to dissolving.Add 130g carbide slag (calcium hydroxide content about 52.5%) subsequently and continue to stir, finish behind the reaction 2h, filter, obtain 1706g Calcium glycinate extracting solution, wherein Calcium glycinate concentration 9.63%, and waste residue is used to make putty usefulness, puies forward calcium rate 95%.Extracting solution is changed in the interior circulation tank reactor (being with ultrasonic), feed carbonic acid gas, when pH＜7, reaction finishes, obtain super fine calcium carbonate lotion 164.71g (moisture content is 48%) after the direct filtration washing, carbonation rate 95%, its median size are 4.502 μ m, and maximum particle diameter is 14.736 μ m, lime carbonate purity 97.6% in the dry powder of oven dry back, whiteness 96, glycine content are 1.92%, and all the other indexs all meet the HG2226-2000 index request.
Embodiment 2: the Calcium glycinate extracting solution that generates with the reaction of glycine and carbide slag in interior circulation tower reactor in the reactor (being with ultrasonic) logical carbonic acid gas prepare the super fine calcium carbonate lotion
2.0L water is joined in the reactor, add the 195g glycine again, be stirred to dissolving.Add 180g carbide slag (calcium hydroxide content about 52.5%) subsequently and continue to stir, finish behind the reaction 2h, filter, obtain 2206g Calcium glycinate extracting solution, wherein the Calcium glycinate ionic concn 11.75%, and waste residue is used to make putty, puies forward calcium rate 92.6%.Change extracting solution over to interior circulation tower reactor (being with ultrasonic), feed carbonic acid gas, when pH＜7, reaction finishes, and obtains lime carbonate lotion 276g (moisture content is 50%) after the direct filtration washing, its median size is 2.254 μ m, maximum particle diameter is 9.457 μ m, lime carbonate purity 98% in the dry powder of oven dry back, whiteness 97, glycine content is 1.72%, and all the other indexs all meet the HG2226-2000 index request.
Embodiment 3: the Calcium glycinate extracting solution that generates with glycine and lime reaction in interior circulation tower reactor in the reactor (being with ultrasonic) logical carbonic acid gas prepare the super fine calcium carbonate lotion
1.8L water is joined in the reactor, add the 173.8g glycine again, be stirred to dissolving.Add 107g lime (wherein calcium hydroxide content about 80%) subsequently and continue to stir, finish behind the reaction 2h, filter, obtain 2070g Calcium glycinate extracting solution, wherein the Calcium glycinate ionic concn 10.08%, and waste residue is used to make putty, puies forward calcium rate 96%.Change extracting solution over to interior circulation tower reactor (being with ultrasonic), feed carbonic acid gas, when pH＜7, reaction finishes, obtain lime carbonate lotion 207g (moisture content is 48%) after the direct filtration washing, carbonation rate 97%, its median size are 2.454 μ m, and maximum particle diameter is 10.796 μ m, lime carbonate purity 98.5% in the dry powder of oven dry back, whiteness 98, glycine content are 1.69%, and all the other indexs all meet the HG2226-2000 index request.
Embodiment 4: the Calcium glycinate extracting solution logical carbonic acid gas in interior circulation tank reactor that generates with glycine and carbide slag reaction prepares the super fine calcium carbonate lotion
3.2L water is joined in the reactor, add the 312g glycine again, be stirred to dissolving.Add 288g carbide slag (calcium hydroxide content about 52.5%) subsequently and continue to stir, finish behind the reaction 2h, filter, obtain 3760g Calcium glycinate extracting solution, wherein the Calcium glycinate ionic concn 9.7%, and waste residue is used to make putty, puies forward calcium rate 95%.Extracting solution is changed in the reactor, feed carbonic acid gas, when pH＜7, reaction finishes, and obtains lime carbonate lotion 377g (moisture content is 50%) after the direct filtration washing, its median size is 9.471 μ m, maximum particle diameter is 23.360 μ m, lime carbonate purity 96% in the dry powder of oven dry back, whiteness 97, glycine content is 1.94%, and all the other indexs all meet the HG2226-2000 index request.
Embodiment 5: the Calcium glycinate extracting solution logical carbonic acid gas carbonization in interior circulation tank reactor (being with ultrasonic) that generates with glycine and lime reaction prepares fine calcium carbonate
2.2L water is joined in the reactor, add the 212.4g glycine again, be stirred to dissolving.Add 131g lime (wherein calcium hydroxide content about 80%) subsequently and continue to stir, finish behind the reaction 2h, filter, obtain 2530g Calcium glycinate extracting solution, wherein Calcium glycinate concentration 10.1%, and waste residue is used to make putty usefulness, puies forward calcium rate 96%.Extracting solution is changed in the interior circulation tank reactor (being with ultrasonic), feed carbonic acid gas, when pH＜7, reaction finishes, obtain fine calcium carbonate lotion 248.8g (moisture content is 48%) behind the filtration washing, carbonation rate 97%, its median size are 6.512 μ m, and maximum particle diameter is 23.453 μ m, lime carbonate purity 98.7% in the dry powder of oven dry back, whiteness 97.5, glycine content are 1.80%, and all the other indexs all meet the HG2226-2000 index request.
The application of super fine calcium carbonate lotion
Application Example 1: the application test of super fine calcium carbonate lotion in coating
In reactor, add 25g water, 0.2g defoamer respectively, 52g lime carbonate (or other powder), the room temperature high speed dispersion stirs 20min, add the 18g emulsion subsequently, 3g alcohol ester+Z (film coalescence aid), 1g thickening material, opacifying power is measured in making sheet behind the continuation dispersed with stirring 15min.Through contrast, the super fine calcium carbonate opacifying power surpasses 1250 purpose talcum powder, is 93% of expensive titanium dioxide opacifying power, is better than commercially available lime carbonate greatly.Therefore medium-to-high grade filler or the pigment (as titanium dioxide, talcum powder etc.) that substitutes in the formulation for coating material with super fine calcium carbonate is possible fully, and this will reduce the raw materials cost of coating significantly, have remarkable economic efficiency.
Opacifying power contrast test data
According to formulation for coating material, with the progressively alternative powder preparing coating wherein of super fine calcium carbonate, after tested, prepared coating can both reach qualified requirement on performance, on performances such as hiding rare, washability, also improve to some extent, provide possibility for directly preparing low-cost coating with super fine calcium carbonate.
Super fine calcium carbonate substitutes powder experimental data in the coating
| Test event | Hiding rare | Washability/time | Solid content/% | All the other performances |
| Former state | 0.96 | 12450 | 58.2 | Qualified |
| Substitute fine particle calcium carbonate | 0.98 | 14100 | 58.7 | |
| Substitute | ||||
| 50% titanium white | 0.95 | 13230 | 58.1 | Qualified |
| Substitute whole titanium whites | 0.94 | 12600 | 57.9 | Qualified |
Super fine calcium carbonate in the present embodiment is embodiment 1 product.
The application test of Application Example 2 super fine calcium carbonates in papermaking
In 200ml paper pulp, add the 0.4g super fine calcium carbonate, mix after the performance of the modification paper that dehydration, squeezing, drying obtain meets relevant criterion, for lime carbonate replace expensive fibrous material, reduce the papermaking cost, improve paper performance provide may, opened up lime carbonate new Application Areas in papermaking.Super fine calcium carbonate in the present embodiment is embodiment 2 products.
Super fine calcium carbonate modification paper performance data
The application test of Application Example 3 super fine calcium carbonate lotions in papermaking
In 200ml paper pulp, add 0.4g lime carbonate, mix after dewater, squeezing, corresponding performance test is carried out to paper pulp in dry back, with commercially available 800 order lime carbonate, 1250 order water-ground limestones and do not add lime carbonate paper pulp contrast, the super fine calcium carbonate of this prepared with lower retention at degree of sizing, whiteness, excellent performance is arranged on the opaqueness, on the situation of identical addition, over-all properties the best, for lime carbonate replaces expensive fibrous material, reduce the papermaking cost, improve paper performance provide may, opened up lime carbonate new Application Areas in papermaking.
Super fine calcium carbonate is added on the performance data in the paper pulp
Super fine calcium carbonate in the present embodiment is embodiment 3 products.
The application test of Application Example 4 super fine calcium carbonate powders in rubber
The super fine calcium carbonate oven dry back of preparation and commercially available 800 order lime carbonate contrasts, according to NCB fill a prescription make test piece after, corresponding physical property test detection is carried out in test piece.Through contrast, super fine calcium carbonate is in tensile strength, and everyways such as tensile yield are better than commercially available 800 light calcium carbonates, excellent combination property.Provide possibility for increasing addition, the reduction rubber cost of super fine calcium carbonate in rubber.
Super fine calcium carbonate is added on the performance data in the rubber
Super fine calcium carbonate in the present embodiment is embodiment 3 products.
The application test of Application Example 5 fine calcium carbonate powders in plastics
Add in polypropylene (PP) and the polyethylene (PE) after the super fine calcium carbonate oven dry with preparation, test its correlated performance, contrast with commercially available 800 order lime carbonate.The contrast of the mensuration of stretched experiment, pliability test and shock test, super fine calcium carbonate has greatly improved on breaking tenacity, flexural strength than commercially available lime carbonate, and it is little that addition reaches the performance variation of 50% o'clock product, also strengthens to some extent.This provides possibility for the performance that strengthens the addition of super fine calcium carbonate in plastics and raising plastics, has great importance.Super fine calcium carbonate in the present embodiment is embodiment 5 products.
Super fine calcium carbonate is added on the performance data in the plastics
Claims (8)
1. the preparation method of a super fine calcium carbonate, its adopts glycine dissolving carbide slag or lime to carry calcium, feeds the carbonic acid gas calcification, and washing obtains super fine calcium carbonate, it is characterized in that it comprises the steps:
1), carry calcium: with the calcium hydroxide reaction in glycine and the carbide slag, impurities in the filtering carbide slag;
2), carbonization: above-mentioned Calcium glycinate filtrate is placed common loop reactor with ultrasonic generating unit, feed carbonic acid gas, when pH value descends 7 when following, end is reacted, and the super fine calcium carbonate that obtains is filtered with filter plant;
3), washing: the lotion for preparing is washed with water, obtain superfine lotion lime carbonate.
2. according to the process of claim 1 wherein, it comprises the steps:
1), carry calcium: earlier with the calcium hydroxide reaction in glycine and the carbide slag, impurities in the filtering carbide slag;
2), carbonization: above-mentioned Calcium glycinate filtrate is placed still formula or tower reactor circulation gas lift reactor with ultrasonic generating unit, feed carbonic acid gas, when pH value 6-7, finish reaction, the super fine calcium carbonate that obtains is directly filtered with plate filter or whizzer, and the glycin mother liquid recycled after the filtration is in the dissolution process of carbide slag;
3), washing: the lotion for preparing with an amount of water washing, is obtained superfine lotion lime carbonate.
3. according to the method for claim 1 or 2, wherein,
In the step 1), glycine concentration is 10-20%; The material mole proportioning of carbide slag and glycine is 1: 1-2.5; Reaction end is pH＜7.
4. according to arbitrary method of claim 1-3, wherein,
Step 2) in, carbonic acid gas is boiler exhaust gas or other stack gas of concentration about 20%; Described reactor is the tower ultrasonic reactor of interior circulation; Filter plant is settling centrifuge or other fine particle calcium carbonate filter plant.
5. according to the application of the super fine calcium carbonate of either party's method of claim 1-4 preparation, it is characterized in that described super fine calcium carbonate is used for papermaking, coating, plastics, rubber, food and feed additive and toothpaste.
6. according to the application of claim 5, wherein, described super fine calcium carbonate is used for part or all of instead of titanium white powder or talcum powder powder raw material in coating or paper.
7. according to the application of claim 5 or 6, wherein, described super fine calcium carbonate lotion is used for plastics, rubber, coating or papermaking after adopting mechanical means to disperse.
8. according to the application of claim 7, wherein, described super fine calcium carbonate is used for plastics or rubber after adopting mechanical means dispersion, drying.
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| CN106219586A (en) * | 2016-08-02 | 2016-12-14 | 王延军 | A kind of be raw material production nanometer grade calcium carbonate with carbide slag device and method |
| EP3090038A4 (en) * | 2013-12-30 | 2017-09-20 | Green Products & Technologies, L.L.C. | Synthetic base and associated methods |
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2009
- 2009-08-21 CN CN2009100914308A patent/CN101993104A/en active Pending
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