CN102730734B - Purification method for calcium carbonate - Google Patents
Purification method for calcium carbonate Download PDFInfo
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- CN102730734B CN102730734B CN201210200396.5A CN201210200396A CN102730734B CN 102730734 B CN102730734 B CN 102730734B CN 201210200396 A CN201210200396 A CN 201210200396A CN 102730734 B CN102730734 B CN 102730734B
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Abstract
The invention relates to a purification method for calcium carbonate, belonging to the technical field of chemical industry. According to the method, lime stone powder, calcium-magnesium powder and marble powder are used as raw materials; barium, magnesium and iron impurities are removed from the raw materials successively and a high purity calcium chloride solution is prepared; then a sodium hydroxide solution with a fixed concentration is added so as to prepare a calcium hydroxide solid-liquid mixture; carbon dioxide is allowed to enter into the mixture under the condition of a constant temperature for a synthesis reaction so as to prepare calcium carbonate slurry; and the carbonate calcium slurry undergoes filtration, draining at a constant temperature, crushing and screening so as to obtain desired calcium carbonate. Compared with traditional production processes for calcium carbonate by using an ammonium bicarbonate method, the purification method provided in the invention has the following advantages: produced effluents are deionized water and sodium chloride, which enables pollution of ammonia nitrogen to environment to be avoided; process flow is simple and controllable, and the whole process is carried out in a closed environment, thereby preventing external pollution powder; and finally prepared calcium carbonate has a small particle size, good dispersibility, high purity and activity, etc., and is extensively used as a ceramic material for a multilayer monolithic capacitor base metal electrode high frequency element and a positive temperature coefficient thermistor element.
Description
Technical field
The present invention relates to chemical technology field, especially relate to a kind of method of purification of calcium carbonate.
Background technology
At present, electronic apparatus and the reliability of communication equipment system manufacturer to various electronic devices and components propose more and more stricter requirement.The starting material that high pure and ultra-fine electronic-grade easily disperses become the key and core that make ultra-fine, ultra-thin, high performance electrode component.Calcium carbonate is as electronic ceramic component main material, due to the reason of each side, granularity is large on the one hand for the calcium carbonate that market provides, reunite serious, medium particle diameter (D50) is large, dispersed bad, and the pure calcium carbonate that another aspect market provides is on the low side, be only about 99%, can not meet the requirement that electron trade is strict.
Summary of the invention
Not high in order to solve existing pure calcium carbonate, particle diameter is large, reunites serious and is unfavorable for the problems such as dispersion.The advantages such as the present invention proposes a kind of method of purification of calcium carbonate, and the calcium carbonate that this method of purification prepares has narrow particle size distribution, and degree of crystallinity is high, easy dispersion.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A method of purification for calcium carbonate, is characterized in that: comprise the steps:
Step one. by the industrial dissolving with hydrochloric acid of the starting material containing calcium carbonate, remove barium, magnesium and the iron contamination in starting material, obtain calcium chloride clear liquid;
Step 2. the calcium chloride clear liquid concentration in step one is mixed with 2.0 ± 0.2mol/L, and be add sodium hydroxide solution at 0.9: 2-1.4: 2 by the mol ratio of calcium ion and hydroxide ion, make aqua calcis, now calcium hydroxide mushy stage coexists;
Step 3. calcium hydroxide gained mushy stage in step 2 coexisted constant temperature at the first temperature 42 ± 1.0 DEG C dissolves, blast carbonic acid gas that at the uniform velocity flow is 40-80kg/h and carry out building-up reactions under keeping the first steady temperature, detection reaction solution pH value when being 6-6.5, obtain required calcium carbonate slurry, the chemical equation of this reaction is as follows:
CaCl
2+2NaOH＝＝＝Ca(OH)
2+2NaCl
Ca(OH)
2+CO
2＝＝＝CaCO
3↓+H
2O
Step 4. step 3 gained calcium carbonate slurry is obtained calcium carbonate filter cake through press filtration, described calcium carbonate filter cake is put into baking oven, constant temperature drying at the second temperature 180 ± 8 DEG C, take out and pulverize, cross 30-100 eye mesh screen, namely obtain required calcium carbonate.
Preferably, the described starting material containing calcium carbonate are dry powder, limestone powder or marble flour.
Preferably, described removal contains barium, magnesium and iron contamination in the starting material of calcium carbonate, and its concrete technology step is:
A. remove containing the barium impurity in the starting material of calcium carbonate: by the described industrial dissolving with hydrochloric acid of starting material containing calcium carbonate, add sulfuric acid and remove barium impurity;
B. remove containing the magnesium in the starting material of calcium carbonate and iron contamination: in the solution of removing barium impurity, add the first oxygenant, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add the first basic solution adjust ph be subsequently 9-11, removing magnesium and part iron contamination, press filtration is removed slag and is obtained calcium chloride solution;
C. the calcium chloride solution in described step B is added sulfuric acid, again except barium impurity, add the second oxygenant, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add the second basic solution adjust ph be subsequently 6-8, remove iron contamination completely, obtain calcium chloride clear liquid.
Further, described first oxygenant and the second oxygenant are hydrogen peroxide, and described first basic solution and the second basic solution are sodium hydroxide solution.
Preferably, the mol ratio of described calcium ion and hydroxide ion is 1.1: 2, and described first temperature is 42 ± 0.5 DEG C, described in the carbonic acid gas that blasts be food-grade carbon-dioxide, described second temperature is 180 ± 5 DEG C.
The invention has the beneficial effects as follows:
1, this invention facilitates process for processing, can carry out industrialization, industrialization, continuously produce large batch of calcium carbonate.
2, the pure calcium carbonate that this invention is produced reaches more than 99.8%, and medium particle diameter (D50) is less than 0.5 micron, specific surface area 4-20m
2/ g is adjustable, and purity reaches 99.8% and is high-purity, and particle diameter is less than 5 microns and is ultra-fine, and the calcium carbonate that namely this invention is produced is the calcium carbonate of high pure and ultra-fine, can meet the requirement of hyundai electronics industry.
3, the calcium carbonate narrow diameter distribution of this invention production, degree of crystallinity is high, easily disperses.
Accompanying drawing explanation
Fig. 1 is the calcium carbonate process flow sheet of preparation in the embodiment of the present invention 1.
Fig. 2 is the calcium carbonate laser particle analyzer detection figure of preparation in the embodiment of the present invention 1.
Fig. 3 is the calcium carbonate scanning electron microscope detection figure of preparation in the embodiment of the present invention 1.
Embodiment
Example of the present invention can not limit the present invention to explanation of the present invention, and any change in the implication suitable with the present invention and scope and adjustment, all should think within the scope of the invention.
Below in conjunction with embodiment, the present invention will be further described.
The method of purification of embodiment 1 one kinds of calcium carbonate, comprises the following steps:
Step one. will be the industrial dissolving with hydrochloric acid of dry powder of 90%-95% containing weight of calcium carbonate proportioning, remove barium, magnesium and iron contamination in starting material, obtain calcium chloride clear liquid; The described acidic solution containing chlorine element can be technical hydrochloric acid or hypochlorous acid, preferred technical hydrochloric acid.
Described removal contains barium, magnesium and iron contamination in the starting material of calcium carbonate, and its concrete technology step is:
A. remove containing the barium impurity in the starting material of calcium carbonate: contain described the industrial dissolving with hydrochloric acid of dry powder that weight of calcium carbonate proportioning is 90%-95%, add the sulfuric acid removal barium impurity that weight proportion is 3-10%;
B. remove containing the magnesium in the starting material of calcium carbonate and iron contamination: in the solution of removing barium impurity, add the hydrogen peroxide that weight proportion is 3-10%, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add sodium hydroxide adjust ph be subsequently 9-11, removing magnesium and part iron contamination, press filtration is removed slag and is obtained calcium chloride solution;
C. the calcium chloride solution in described step B is added the sulfuric acid that weight proportion is 2-5%, again except barium impurity, add the hydrogen peroxide that weight proportion is 2-5%, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add sodium hydroxide solution adjust ph be subsequently 6-8, remove iron contamination completely, obtain calcium chloride clear liquid by chuck or coil pipe water quench to room temperature.
Described first oxygenant and described second oxygenant can be hydrogen peroxide, Potassium peroxide or sodium peroxide, preferred hydrogen peroxide, and described first basic solution and described second basic solution can be sodium hydroxide solution or potassium hydroxide solution, preferred sodium hydroxide solution.
Step 2. the calcium chloride clear liquid concentration in step one is mixed with 2.0 ± 0.2mol/L, and be add sodium hydroxide solution at 1.1: 2 by the mol ratio of calcium ion and hydroxide ion, make aqua calcis, now calcium hydroxide mushy stage coexists;
The preparation of sodium hydroxide solution in described step 2: iron contamination content is less than the sodium hydrate solid of 5ppm, high purity deionized water adds the 1st stainless steel stirred pot and dissolve, control detect concentration of sodium hydroxide solution be 4.0-6.0mol/L, be down to less than 40 DEG C for subsequent use;
Under the condition of Keep agitation, quantitative calcium chloride clear liquid, quantitatively deionized water are joined in the 2nd stainless steel stirred pot, control calcium chloride concentration is 2.0 ± 0.2mol/L, subsequently the sodium hydroxide solution of described preparation is joined in the 2nd stainless steel stirred pot, the aqua calcis that obtained mushy stage coexists.
Step 3. calcium hydroxide gained mushy stage in step 2 coexisted constant temperature at the first temperature 42 ± 0.5 DEG C dissolves, blast food-grade carbon-dioxide that at the uniform velocity flow is 40-80kg/h and carry out building-up reactions under keeping the first steady temperature, detection reaction solution pH value when being 6-6.5, obtain required calcium carbonate slurry, the chemical equation of this reaction is as follows:
CaCl
2+2NaOH＝＝＝Ca(OH)
2+2NaCl
Ca(OH)
2+CO
2＝＝＝CaCO
3↓+H
2O
Step 4. step 3 gained calcium carbonate slurry is obtained calcium carbonate filter cake through press filtration, described calcium carbonate filter cake is put into baking oven, constant temperature drying at the second temperature 180 ± 5 DEG C, take out and pulverize, cross 30-100 eye mesh screen, namely obtain required calcium carbonate.
The method of purification of embodiment 2 one kinds of calcium carbonate, comprises the following steps:
Step one. will be the industrial dissolving with hydrochloric acid of limestone powder of 90%-95% containing weight of calcium carbonate proportioning, remove barium, magnesium and iron contamination in starting material, obtain calcium chloride clear liquid; The described acidic solution containing chlorine element can be technical hydrochloric acid or hypochlorous acid, preferred technical hydrochloric acid.
Described removal contains barium, magnesium and iron contamination in the starting material of calcium carbonate, and its concrete technology step is:
A. remove containing the barium impurity in the starting material of calcium carbonate: contain described the industrial dissolving with hydrochloric acid of dry powder that weight of calcium carbonate proportioning is 90%-95%, add the sulfuric acid removal barium impurity that weight proportion is 3-10%;
B. remove containing the magnesium in the starting material of calcium carbonate and iron contamination: in the solution of removing barium impurity, add the hydrogen peroxide that weight proportion is 3-10%, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add sodium hydroxide adjust ph be subsequently 9-11, removing magnesium and part iron contamination, press filtration is removed slag and is obtained calcium chloride solution;
C. the calcium chloride solution in described step B is added the sulfuric acid that weight proportion is 2-5%, again except barium impurity, add the hydrogen peroxide that weight proportion is 2-5%, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add sodium hydroxide solution adjust ph be subsequently 6-8, remove iron contamination completely, obtain calcium chloride clear liquid by chuck or coil pipe water quench to room temperature.
Described first oxygenant and described second oxygenant can be hydrogen peroxide, Potassium peroxide or sodium peroxide, preferred hydrogen peroxide, and described first basic solution and described second basic solution can be sodium hydroxide solution or potassium hydroxide solution, preferred sodium hydroxide solution.
Step 2. the calcium chloride clear liquid concentration in step one is mixed with 2.0 ± 0.2mol/L, and be add sodium hydroxide solution at 1.1: 2 by the mol ratio of calcium ion and hydroxide ion, make aqua calcis, now calcium hydroxide mushy stage coexists;
The preparation of sodium hydroxide solution in described step 2: iron contamination content is less than the sodium hydrate solid of 5ppm, high purity deionized water adds the 1st stainless steel stirred pot and dissolve, control detect concentration of sodium hydroxide solution be 4.0-6.0mol/L, be down to less than 40 DEG C for subsequent use;
Under the condition of Keep agitation, quantitative calcium chloride clear liquid, quantitatively deionized water are joined in the 2nd stainless steel stirred pot, control calcium chloride concentration is 2.0 ± 0.2mol/L, subsequently the sodium hydroxide solution of described preparation is joined in the second stainless steel stirred pot, the aqua calcis that obtained mushy stage coexists.
Step 3. calcium hydroxide gained mushy stage in step 2 coexisted constant temperature at the first temperature 42 ± 0.5 DEG C dissolves, blast food-grade carbon-dioxide that at the uniform velocity flow is 40-80kg/h and carry out building-up reactions under keeping the first steady temperature, detection reaction solution pH value when being 6-6.5, obtain required calcium carbonate slurry, the chemical equation of this reaction is as follows:
CaCl
2+2NaOH＝＝＝Ca(OH)
2+2NaCl
Ca(OH)
2+CO
2＝＝＝CaCO
3↓+H
2O
Step 4. step 3 gained calcium carbonate slurry is obtained calcium carbonate filter cake through press filtration, described calcium carbonate filter cake is put into baking oven, constant temperature drying at the second temperature 180 ± 5 DEG C, take out and pulverize, cross 30-100 eye mesh screen, namely obtain required calcium carbonate.
The method of purification of embodiment 3 one kinds of calcium carbonate, comprises the following steps:
Step one. will be the industrial dissolving with hydrochloric acid of marble flour of 90%-95% containing weight of calcium carbonate proportioning, remove barium, magnesium and iron contamination in starting material, obtain calcium chloride clear liquid; The described acidic solution containing chlorine element can be technical hydrochloric acid or hypochlorous acid, preferred technical hydrochloric acid.
Barium, magnesium and iron contamination in described removal starting material, its concrete technology step is:
A. remove the barium impurity in starting material: contain described the industrial dissolving with hydrochloric acid of dry powder that weight of calcium carbonate proportioning is 90%-95%, add the sulfuric acid removal barium impurity that weight proportion is 3-10%;
B. the magnesium in starting material and iron contamination is removed: in the solution of removing barium impurity, add the hydrogen peroxide that weight proportion is 3-10%, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add sodium hydroxide adjust ph be subsequently 9-11, removing magnesium and part iron contamination, press filtration is removed slag and is obtained calcium chloride solution;
C. the calcium oxide solution in described step B is added the sulfuric acid that weight proportion is 2-5%, again except barium impurity, add the hydrogen peroxide that weight proportion is 2-5%, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add sodium hydroxide solution adjust ph be subsequently 6-8, remove iron contamination completely, obtain calcium chloride clear liquid by chuck or coil pipe water quench to room temperature.
Described first oxygenant and described second oxygenant can be hydrogen peroxide, Potassium peroxide or sodium peroxide, preferred hydrogen peroxide, and described first basic solution and described second basic solution can be sodium hydroxide solution or potassium hydroxide solution, preferred sodium hydroxide solution.
Step 2. the calcium chloride clear liquid concentration in step one is mixed with 2.0 ± 0.2mol/L, and be add sodium hydroxide solution at 1.1: 2 by the mol ratio of calcium ion and hydroxide ion, make aqua calcis, now calcium hydroxide mushy stage coexists;
The preparation of sodium hydroxide solution in described step 2: iron contamination content is less than the sodium hydrate solid of 5ppm, high purity deionized water adds the 1st stainless steel stirred pot and dissolve, control detect concentration of sodium hydroxide solution be 4.0-6.0mol/L, be down to less than 40 DEG C for subsequent use;
Under the condition of Keep agitation, quantitative calcium chloride clear liquid, quantitatively deionized water are joined in the 2nd stainless steel stirred pot, control calcium chloride concentration is 2.0 ± 0.2mol/L, subsequently the sodium hydroxide solution of described preparation is joined in the second stainless steel stirred pot, the aqua calcis that obtained mushy stage coexists.
Step 3. calcium hydroxide gained mushy stage in step 2 coexisted constant temperature at the first temperature 42 ± 0.5 DEG C dissolves, blast food-grade carbon-dioxide that at the uniform velocity flow is 40-80kg/h and carry out building-up reactions under keeping the first steady temperature, detection reaction solution pH value when being 6-6.5, obtain required calcium carbonate slurry, the chemical equation of this reaction is as follows:
CaCl
2+2NaOH＝＝＝Ca(OH)
2+2NaCl
Ca(OH)
2+CO
2＝＝＝CaCO
3↓+H
2O
Step 4. step 3 gained calcium carbonate slurry is obtained calcium carbonate filter cake through press filtration, described calcium carbonate filter cake is put into baking oven, constant temperature drying at the second temperature 180 ± 5 DEG C, take out and pulverize, cross 30-100 eye mesh screen, namely obtain required calcium carbonate.
Fig. 2 is the calcium carbonate laser particle analyzer detection figure prepared in the embodiment of the present invention, as can be seen from Figure 2, calculate from 0.040 μm to 2000 μm, volume 100%, mean value 0.410 μm, standard deviation (S.D) 0.086 μm, intermediate value 0.406 μm, relative standard deviation (C.V) 21.1%, granularity table refers to table 1.
Table 1
| ％< | 10 | 25 | 50 | 75 | 90 |
| Granularity μm | 0.298 | 0.346 | 0.406 | 0.470 | 0.527 |
This Carbonate Particle Size is very little, distributes very narrow, very concentrated, good dispersity, soilless sticking.
Fig. 3 is the calcium carbonate scanning electron microscope detection figure prepared in the embodiment of the present invention, as can be seen from Figure 3 the calcium carbonate crystal degree prepared in this embodiment is good, soilless sticking, mainly process implementing process synthesis temperature is constant, pass into carbon dioxide flow at the uniform velocity, calcium carbonate granule evenly separated out, synchronous growth.
High pure and ultra-fine Strontium carbonate powder prepared by the present invention has narrow particle size distribution, degree of crystallinity is high, the advantages such as easy dispersion, can meet that hyundai electronics ceramic components industry is ultra-fine, ultra-thin, the requirement of high pressure, heavy body, such as, can be applicable in multilayer monolith electrical condenser (MLCC) electrodes in base metal high-frequency porcelain (COG) and high-end posistor (PTC) porcelain.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a method of purification for calcium carbonate, is characterized in that: comprise the steps:
Step one. by the industrial dissolving with hydrochloric acid of the starting material containing calcium carbonate, remove barium, magnesium and the iron contamination in starting material, obtain calcium chloride clear liquid;
Step 2. the calcium chloride clear liquid concentration in step one is mixed with 2.0 ± 0.2mol/L, and be add sodium hydroxide solution at 0.9: 2-1.4: 2 by the mol ratio of calcium ion and hydroxide ion, make aqua calcis, now calcium hydroxide mushy stage coexists;
Step 3. calcium hydroxide gained mushy stage in step 2 coexisted constant temperature at the first temperature 42 ± 1.0 DEG C dissolves, blast carbonic acid gas that at the uniform velocity flow is 40-80kg/h and carry out building-up reactions under keeping the first temperature, when the pH value of detection reaction solution is 6-6.5, obtain required calcium carbonate slurry, the chemical equation of this reaction is as follows:
CaCl
2+2NaOH＝＝＝Ca(OH)
2+2NaCl
Ca(OH)
2+CO
2＝＝＝CaCO
3↓+H
2O
Step 4. step 3 gained calcium carbonate slurry is obtained calcium carbonate filter cake through press filtration, described calcium carbonate filter cake is put into baking oven, constant temperature drying at the second temperature 180 ± 8 DEG C, take out and pulverize, cross 30-100 eye mesh screen, namely obtain required calcium carbonate.
2. the method for purification of calcium carbonate according to claim 1, is characterized in that: the described starting material containing calcium carbonate are dry powder, limestone powder or marble flour.
3. the method for purification of calcium carbonate according to claim 1, is characterized in that: described removal contains barium, magnesium and iron contamination in the starting material of calcium carbonate, and its concrete technology step is:
A. remove containing the barium impurity in the starting material of calcium carbonate: by the described industrial dissolving with hydrochloric acid of starting material containing calcium carbonate, add sulfuric acid and remove barium impurity;
B. remove containing the magnesium in the starting material of calcium carbonate and iron contamination: in the solution of removing barium impurity, add the first oxygenant, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add the first basic solution adjust ph be subsequently 9-11, removing magnesium and part iron contamination, press filtration is removed slag and is obtained calcium chloride solution;
C. the calcium chloride solution in described step B is added sulfuric acid, again except barium impurity, add the second oxygenant, be heated to temperature 90 DEG C-100 DEG C, constant temperature 15-60 minute, when to add the second basic solution adjust ph be subsequently 6-8, remove iron contamination completely, obtain calcium chloride clear liquid.
4. the method for purification of calcium carbonate according to claim 3, is characterized in that: described first oxygenant and the second oxygenant are hydrogen peroxide.
5. the method for purification of calcium carbonate according to claim 4, is characterized in that: described first basic solution and the second basic solution are sodium hydroxide solution.
6. the method for purification of calcium carbonate according to claim 1, is characterized in that: the mol ratio of described calcium ion and hydroxide ion is 1.1:2.
7. the method for purification of calcium carbonate according to claim 1, is characterized in that: described first temperature is 42 ± 0.5 DEG C.
8. the method for purification of calcium carbonate according to claim 1, is characterized in that: described in the carbonic acid gas that blasts be food-grade carbon-dioxide.
9. the method for purification of calcium carbonate according to claim 1, is characterized in that: described second temperature is 180 ± 5 DEG C.
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| CN103103351A (en) * | 2013-01-31 | 2013-05-15 | 福建省长汀金龙稀土有限公司 | Method for preparing high-purity calcium carbonate for saponifying rare earth extraction agent |
| CN106925099A (en) * | 2015-12-29 | 2017-07-07 | 天津市英派克石化工程有限公司 | A kind of modified technique that wet type desulfurizing agent is prepared with marble powder |
| CN107177733B (en) * | 2017-06-05 | 2018-12-21 | 中南大学 | A kind of method of barite deposit refining and edulcoration synthetical recovery calcium and magnesium |
| CN107758718B (en) * | 2017-11-17 | 2020-08-28 | 池州市富华粉体科技有限公司 | Method for preparing superfine calcium carbonate nano powder from calcite |
| CN108002419A (en) * | 2017-12-15 | 2018-05-08 | 柳州吉辉机械设计有限公司 | A kind of method that precipitated calcium carbonate is prepared with Dali rock ballast |
| CN111717928A (en) * | 2020-04-24 | 2020-09-29 | 广西科学院 | Method for preparing nano calcium carbonate by in-situ electrochemical precipitation technology |
| WO2021222585A2 (en) * | 2020-05-01 | 2021-11-04 | Massachusetts Institute Of Technology | Use of reactor outputs to purify materials, and related systems |
| WO2022204059A1 (en) | 2021-03-22 | 2022-09-29 | Sublime Systems, Inc. | Decarbonized cement blends |
| CN117699842B (en) * | 2024-01-11 | 2024-06-04 | 上海碳酸钙厂有限公司 | Preparation method of active nano calcium carbonate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170394A (en) * | 1994-11-21 | 1998-01-14 | 矿业技术有限公司 | Method for purification of calcium carbonate |
| CN101074106A (en) * | 2007-06-27 | 2007-11-21 | 仙桃市中星电子材料有限公司 | Production of high-purity spherical nano-calcium carbonate |
| CN101591033A (en) * | 2009-06-30 | 2009-12-02 | 广东风华高新科技股份有限公司 | A kind of preparing calcium carbonate powder |
| CN101712483A (en) * | 2008-10-06 | 2010-05-26 | 天津市化学试剂研究所 | Preparation method of standard reagent calcium carbonate |
| CN102001693A (en) * | 2010-12-02 | 2011-04-06 | 昊青薪材（北京）技术有限公司 | Process for preparing light magnesium oxide and calcium carbonate powder by utilizing dolomite acid method |
-
2012
- 2012-06-18 CN CN201210200396.5A patent/CN102730734B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170394A (en) * | 1994-11-21 | 1998-01-14 | 矿业技术有限公司 | Method for purification of calcium carbonate |
| CN101074106A (en) * | 2007-06-27 | 2007-11-21 | 仙桃市中星电子材料有限公司 | Production of high-purity spherical nano-calcium carbonate |
| CN101712483A (en) * | 2008-10-06 | 2010-05-26 | 天津市化学试剂研究所 | Preparation method of standard reagent calcium carbonate |
| CN101591033A (en) * | 2009-06-30 | 2009-12-02 | 广东风华高新科技股份有限公司 | A kind of preparing calcium carbonate powder |
| CN102001693A (en) * | 2010-12-02 | 2011-04-06 | 昊青薪材（北京）技术有限公司 | Process for preparing light magnesium oxide and calcium carbonate powder by utilizing dolomite acid method |
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