CN1023996C - Method for producing highly active calcium oxide - Google Patents
Method for producing highly active calcium oxide Download PDFInfo
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- CN1023996C CN1023996C CN 91106412 CN91106412A CN1023996C CN 1023996 C CN1023996 C CN 1023996C CN 91106412 CN91106412 CN 91106412 CN 91106412 A CN91106412 A CN 91106412A CN 1023996 C CN1023996 C CN 1023996C
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- calcium oxide
- highly active
- active calcium
- sodium
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Abstract
The present invention relates to a process for calcining calcium oxide with high activity in a vertical kiln. The present invention is characterized in that sodium chloride is used for excitation and accounts for 0.5 to 2.5% of limestone, and the sodium chloride and the limestone are calcined at a temperature of 850 to 1300 DEG C. The product structure is loose and porous, and the content of a type CaO is larger than or equal to 94.5%; the activity is larger than or equal to 370 ml, and the product quality is superior to the quality of products calcined in a congener kiln at home and abroad. The calcium hydroxide obtained by hydration has high activity, and is widely used for treating soft water and producing bleaching powder, bleaching powder concentrates, epoxy chloropropane, propylene oxide, calcium base grease, filling materials of acetylene cylinders, rubber additives, petrochemical industrial additives, medicines, etc., and the present invention provides a process for producing calcium hydroxide at home.
Description
The present invention relates to the manufacture method of calcium oxide, particularly a kind of manufacture method of highly active calcium oxide.
Make the traditional technology of calcium oxide, continue to use ancient shaft furnace biscuiting technology-promptly at home always and load in mixture in shaft furnace with Wingdale and coke or coal, decarboxylation after calcining, carbonic acid gas emptying or recovery, remaining solid is a calcium oxide in the kiln.
The shortcoming of traditional technology is that raw material limestone and fuel are that solid loads in mixture, and are difficult to evenly; The calcining zone heat distribution is extremely inconsistent in the kiln; The decarboxylic reaction time is difficult to accurate control.
Very easily cause:
(1) the kiln temperature part too high, when calcination time is long, lime carbonate decomposition speed and calcium oxide crystallization velocity are too fast, generate the calcium oxide crystal that crystal grain is trickle, structure is closely knit, even form half sintering or sintering state, become β or γ type calcium oxide, their porositys are extremely low, present very low chemically reactive.
(2) calcining belt temperature local low with excessivelying, when calcination time is not enough again, give birth to the sharp increase of burning amount, purity is not high, active corresponding reduction.
Domestic production calcium oxide quality is producer preferably, and the quality of the calcium oxide of its shaft furnace biscuiting technology also only can reach CaO 〉=85%, activity 〉=250ml.
Thereby the calcium oxide of domestic traditional shaft furnace biscuiting explained hereafter only is applicable to the less demanding occasion of activity, as material of construction, soil modifier etc.
Abroad, burn or rusting technology with the revolution kiln gas, the calcium oxide of manufacturing, its quality is: CaO 〉=89%, activity 〉=290ml, the quality of producing than domestic shaft furnace biscuiting technology is slightly good.
Have some to report about the patent of making highly active calcium oxide, but its particular requirement is all arranged, as SU998,351 use the chemical settling lime carbonate, and raw material is made slip, interpolation calcium sulfate-sodium hydroxide is made catalyzer, used rotary kiln CaO 〉=95%; The clear 59-21521 of JP only mentions CaO 〉=96%, not mentioned calcining process; WO84/03691, with catalyzer-as (MX) (CaO) refractory surface of mixture melt granules (wherein M is a halogenide for basic metal X), kiln also with above-mentioned fused salt cladding or the like.Their investments are big, complex process, energy consumption height, construction investment are big, are not suitable for the current national conditions of China.
Purpose of the present invention, exactly under the prerequisite that can utilize the existing shaft furnace equipment of China, look for a kind of improvement technology of suitable China's national situation, produce highly active calcium oxide, satisfy the needs of different industries, change the situation that China's calcium oxide industrial manufacture process falls behind high chemically reactive calcium oxide.
Technical application scheme of the present invention is:
Designed a kind ofly by Wingdale and coke or coal, through adding thermal decarboxylation, the method-shaft furnace salt firing technique of highly active calcium oxide is produced in screening, it is characterized in that, adds 0.5～2.5% sodium-chlor of Wingdale weight in the raw material in shaft furnace.
The method of above-mentioned production highly active calcium oxide is characterized in that the sodium-chlor that adds is solid.
The method of above-mentioned production highly active calcium oxide is characterized in that the sodium-chlor that adds is saturated solution.
The method of above-mentioned production highly active calcium oxide is characterized in that described calcining zone heating decarboxylation temperature is 850～1300 ℃.
The method of above-mentioned production highly active calcium oxide is characterized in that described to add the thermal decarboxylation time be 2～6h.
Through practical proof, because the adding of sodium-chlor has increased divided calcium carbonate and separated air pressure, reduced the crystallization velocity of the decomposition rate and the calcium oxide of lime carbonate effectively, eliminated too high, the long drawback that produces of calcination time of local temperature in the calcining zone.Product confirms through the electron microscope scanning image; for crystal grain is independent mutually, more well-regulated α type highly active calcium oxide, its short texture porous, CaO 〉=94.5%; activity 〉=370ml is better than the quality level of the highly active calcium oxide that the similar kiln type in home and abroad produces.Thereby reversed the calcium oxide of China's shaft furnace biscuiting explained hereafter, the backward situation that quality is not good, use face is narrow has been filled up domestic blank.
The highly active calcium oxide that shaft furnace salt firing technique provided by the invention is produced, because its high reactivity, high quality, suddenly become important basic chemical raw materials, this kind α type highly active calcium oxide, specific surface area and surface energy are all big, calcium hydroxide with it makes after aquation has high reactivity, high purity equally, is widely used in chlorinated lime, high test bleaching powder, epoxy chloropropane, propylene oxide, calcium grease lubricating oil, acetylene cylinder filler, soft water processing, rubber and petrochemical complex additive and medicine production etc.
The highly active calcium oxide that technology of the present invention provides, through how tame high test bleaching powder, epoxy chloropropane, propylene oxide, calcium grease lubricating oil, acetylene cylinder filler, use as soft water processing, rubber and petrochemical complex additive and medical manufacturer, to its highly active quality, be satisfied with.
Compared with prior art, the present invention has tangible advantage:
1. can utilize existing shaft furnace equipment, reduced investment, instant effect, additive is inexpensive, be easy to get, and is fit to China's national situation;
2. good product quality is active high, meets and exceeds similar kiln type advanced level;
3. hear rate is than the low 838kJ/kg of rotary kiln.
Reached intended purposes of the present invention.
Its technical process is:
The present invention is further elaborated below in conjunction with embodiment:
[embodiment one]
Wingdale contains CaCO
3〉=97%, particle diameter 60～90mm; Coke, thermal value 〉=27300kJ/kg, particle diameter 25～40mm; Sodium-chlor, commercial size.
Three's weight ratio is a Wingdale: coke: sodium-chlor=100: 8.5: 1.0
Mix, use the windlass material loading, it is uniformly distributed in the shaft furnace, use thermocouple measuring temperature, control calcining temperature and be, preheating zone＜350 ℃, 850～1100 ℃ of calcining zones, cooling zone＜450 ℃.Decarboxylation time 6h, discharging, with the Vibrationsifter screening of sieve aperture 10mm, screen overflow is product, after testing, α type calcium oxide content 94.56%, crystal grain diameter 4.16～5.20 μ m, activity 371.13ml(50g, 4mol/L HCl, 10 minutes methods).
[embodiment two]
Wingdale contains CaCO
3〉=97%, particle diameter 60～90mm; Coke, thermal value 〉=27300kJ/kg, particle diameter 25～40mm; Sodium-chlor, commercial size.
Three's weight ratio is a Wingdale: coke: sodium-chlor=100: 9.5: 1.5
Mix, use the windlass material loading, it is uniformly distributed in the shaft furnace, use thermocouple measuring temperature, control calcining temperature and be, preheating zone＜350 ℃, 950～1150 ℃ of calcining zones, cooling zone＜450 ℃.Decarboxylation time 4h, discharging, with the Vibrationsifter screening of sieve aperture 10mm, screen overflow is product, after testing, α type calcium oxide content 95.87%, crystal grain diameter 4.10～5.35 μ m, activity 376.27ml(50g, 4mol/L HCl, 10 minutes methods).
[embodiment three]
Wingdale contains CaCO
3〉=97%, particle diameter 60～90mm; Coke, thermal value 〉=27300kJ/kg, particle diameter 25～40mm; Sodium-chlor, commercial size.
Three's weight ratio is a Wingdale: coke: sodium-chlor=100: 9.0: 2.0
Mix, use the windlass material loading, it is uniformly distributed in the shaft furnace, use thermocouple measuring temperature, control calcining temperature and be, preheating zone＜350 ℃, 1000～1250 ℃ of calcining zones, cooling zone＜450 ℃.Decarboxylation time 2h, discharging, with the Vibrationsifter screening of sieve aperture 10mm, screen overflow is product, after testing, α type calcium oxide content 95.87%, crystal grain diameter 3.12～4.68 μ m, activity 376.27ml(50g, 4mol/L HCl, 10 minutes methods).
[embodiment four]
Wingdale contains CaCO
3〉=97%, particle diameter 60～90mm; Coke, thermal value 〉=27300kJ/kg, particle diameter 25～40mm; Sodium-chlor, commercial size is made into saturated solution.
Three's weight ratio is a Wingdale: coke: sodium-chlor=100: 8.5: 0.5
Mix, use the windlass material loading, it is uniformly distributed in the shaft furnace, use thermocouple measuring temperature, control calcining temperature and be, preheating zone＜350 ℃, 850～1100 ℃ of calcining zones, cooling zone＜450 ℃.Decarboxylation time 6h, discharging, with the Vibrationsifter screening of sieve aperture 10mm, screen overflow is product, after testing, α type calcium oxide content 94.79%, crystal grain diameter 4.35～6.96 μ m, activity 372.03ml(50g, 4mol/L HCl, 10 minutes methods).
[embodiment five]
Three's weight ratio is a Wingdale: coke: sodium-chlor=100: 9.5: 2.0
Difference is, sodium-chlor is made into saturated solution, and spray adds from the kiln top, and the control calcining temperature is, preheating zone＜350 ℃, 950～1200 ℃ of calcining zones, cooling zone＜450 ℃.Decarboxylation time 4h, all the other are all with embodiment four.
Product after testing, α type calcium oxide content 96.62%, crystal grain diameter 4.35～8.70 μ m, activity 379.21ml(50g, 4mol/L HCl, 10 minutes methods).
[embodiment six]
Three's weight ratio is a Wingdale: coke: sodium-chlor=100: 10.5: 2.5
Difference is, sodium-chlor is made into saturated solution, and spray adds from the kiln top, and the control calcining temperature is, preheating zone＜350 ℃, 1000～1300 ℃ of calcining zones, cooling zone＜450 ℃.Decarboxylation time 2h, all the other are all with embodiment four.
Product after testing, α type calcium oxide content 95.46%, crystal grain diameter 5.22～9.57 μ m, activity 374.66ml(50g, 4mol/L HCl, 10 minutes methods).
Claims (5)
1, a kind of by Wingdale and coke or coal, in shaft furnace,, sieve through adding thermal decarboxylation, produce the method for highly active calcium oxide, feature of the present invention is to add the sodium-chlor of Wingdale weight 0.5～2.5% in the raw material.
2,, it is characterized in that the sodium-chlor that is added is solid according to the method for the described production highly active calcium oxide of claim 1.
3,, it is characterized in that the sodium-chlor that is added is saturated solution according to the method for the described production highly active calcium oxide of claim 1.
4,, it is characterized in that described calcining zone heating decarboxylation temperature is 850～1300 ℃ according to the method for claim 2 or 3 described production highly active calcium oxides.
5,, it is characterized in that described to add the thermal decarboxylation time be 2～6h according to the method for claim 2 or 3 described production highly active calcium oxides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106412 CN1023996C (en) | 1991-05-14 | 1991-05-14 | Method for producing highly active calcium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91106412 CN1023996C (en) | 1991-05-14 | 1991-05-14 | Method for producing highly active calcium oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058198A CN1058198A (en) | 1992-01-29 |
| CN1023996C true CN1023996C (en) | 1994-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 91106412 Expired - Fee Related CN1023996C (en) | 1991-05-14 | 1991-05-14 | Method for producing highly active calcium oxide |
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| CN (1) | CN1023996C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400452C (en) * | 2006-02-14 | 2008-07-09 | 赵凯 | Method for preparing active lime |
| CN100427611C (en) * | 2005-01-25 | 2008-10-22 | 黄永春 | Efficient lime clarifier for sugar solution and its prepn and use |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392053C (en) * | 2005-03-04 | 2008-06-04 | 郑恒春 | Novel fuel with limestone as main component and preparation method thereof |
| CN101003421B (en) * | 2006-12-22 | 2012-02-15 | 湖北宜化集团有限责任公司 | Method for calcining limestone by using relaxed discharged gas of synthetic ammonia as fuel |
| CN101607791B (en) * | 2009-06-02 | 2012-08-22 | 覃忠 | Process approach for preparing quick lime by heating carbon source and calcining limestone with microwave |
| CN101913638B (en) * | 2010-08-02 | 2012-10-03 | 何宜刚 | Micrometer calcium oxide, preparation method thereof and use thereof in preparation of biodiesel |
| CN103408051B (en) * | 2013-08-07 | 2015-11-18 | 中国科学院过程工程研究所 | A kind of calcium oxide agglomerate high reactivity is coupled with high strength regulate and control method |
| CN105254192A (en) * | 2015-09-30 | 2016-01-20 | 长兴富强钙业有限公司 | Calcium oxide production technology |
| CN107720798B (en) * | 2017-09-30 | 2020-01-10 | 广西华洋矿源材料有限公司 | Preparation method of active calcium oxide |
-
1991
- 1991-05-14 CN CN 91106412 patent/CN1023996C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427611C (en) * | 2005-01-25 | 2008-10-22 | 黄永春 | Efficient lime clarifier for sugar solution and its prepn and use |
| CN100400452C (en) * | 2006-02-14 | 2008-07-09 | 赵凯 | Method for preparing active lime |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1058198A (en) | 1992-01-29 |
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