CN101654261A - Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate - Google Patents
Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate Download PDFInfo
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- CN101654261A CN101654261A CN200910041215A CN200910041215A CN101654261A CN 101654261 A CN101654261 A CN 101654261A CN 200910041215 A CN200910041215 A CN 200910041215A CN 200910041215 A CN200910041215 A CN 200910041215A CN 101654261 A CN101654261 A CN 101654261A
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- sodium hydroxide
- calcium carbonate
- caustic soda
- liquid caustic
- quality liquid
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Abstract
The invention discloses a method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate. The main technical scheme is as follows: carrying out chemical reaction on carbide slag and sodium carbonate in a certain proportion to generate the mixed liquor of sodium hydroxide and calcium carbonate; centrifuging the mixed liquor to obtain sodium hydroxide dilutesolution; and directly distilling the sodium hydroxide dilute solution to obtain high-quality liquid caustic soda sodium hydroxide; and carrying out washing, drying, crashing and packaging on filter cake to obtain calcium carbonate. The method of the invention effectively reduces production cost of high-quality liquid caustic soda sodium hydroxide, improves productivity of sodium hydroxide by washing and recovering, and simultaneously governs three wastes discharge to turn into products.
Description
Technical field:
The present invention relates to the technical field of three chemical wastes and utilization, especially a kind of method of making low high-quality liquid caustic soda and high-grade calcium carbonate.
Technical background:
At present, the method for producing sodium hydroxide is except the ionic membrane method, and that has been exactly a causticizing process, mainly is to utilize slaked lime and soda ash to carry out causticizing reaction under certain condition and make.The shortcoming of this method is the production cost height, and productive rate is low, and the three waste discharge phenomenon is arranged.And the present invention is on the basis of causticizing process, utilize the chemical spent material calcium carbide slag to substitute slaked lime cost is reduced greatly, and, both reclaimed alkali lye by washing and improved productive rate the waste residue utilization that discharges after the causticization, produce the ordinary calcium carbonate product again, the three wastes have also obtained improvement simultaneously.
Summary of the invention:
The invention provides a kind of method of making low high-quality liquid caustic soda and high-grade calcium carbonate, effectively reduced the production cost of liquid sodium hydroxide, improved the productive rate of sodium hydroxide again, also administered three waste discharge simultaneously by washing and recycling.
To achieve the above object, technical scheme of the present invention is:
Carbide slag acidified purifies and obtains purified calcium hydroxide, and its process is:
The carbide slag water is modulated into emulsion and the mass ratio of dilution hydrochloric acid well in pure substance: 1: the ratio of 0.76-1.16 is put into reactor (1) lining, under stirring slowly, carry out chemical reaction, obtain the calcium chloride mixing solutions, suction filtration gets calcium chloride clear liquor and carbon dust slag.Then calcium chloride and sodium hydroxide according to the mass ratio 1 of pure substance: 0.52-0.92 be input to reactor (2) carry out chemical reaction obtain fine calcium hydroxide mixing solutions suction filtration (3) the clarification of calcium hydroxide filter cake and sodium-chlor.
The calcium hydroxide that obtains after purifying reconciled under the stirring that the good soda ash of emulsion and dissolving blows slowly in causticization still (4) lining according to pure substance mass ratio 1: 1.23-1.63 again with clear water carry out chemical reaction, temperature of reaction was controlled at the 40-50 degree, obtained the mixing liquid of sodium hydroxide and lime carbonate through 2-5 hour causticizing reaction.Wash through centrifugal (5) afterwards and obtain dilute solution of sodium hydroxide and calcium carbonate wet product after pouring separates, dilute solution of sodium hydroxide enters finishing room (7) through underpressure distillation (6) to 25% sodium hydroxide liquid caustic soda; Lime carbonate drying (8) is pulverized (9), and packing becomes the finished product high-grade calcium carbonate.
Its chemical principle is: Ca (OH)
2+ 2HCl===CaCl
2+ H
2O
CaCl
2+NaOH＝＝＝Ca(OH)
2+2NaCl
Ca(OH)
2+Na
2CO
3＝＝2NaOH+CaCO
3
Description of drawings:
This figure is a process flow sheet of the present invention, wherein
1------reactor one, 2------reactor two, the 3------suction filter, 4------causticization still, the 5------whizzer, the 6------vacuum distilling apparatus, 7-------liquid caustic soda storage tank, the 8------drying room is between 9------pulverizes.
Concrete embodiment:
Embodiment one: the carbide slag water of 600kg is modulated into emulsion is reduced into the mass ratio of the good soda ash of calcium hydroxide and dissolving in pure substance again through purifying: 1: 1.43 ratio is put into causticization still (4) lining, under stirring slowly, carry out chemical reaction, temperature of reaction was controlled at the 40-50 degree, obtained the mixing liquid of sodium hydroxide and lime carbonate through 3 hours causticizing reactions.Wash through centrifugal (5) afterwards and obtain dilute solution of sodium hydroxide and calcium carbonate wet product after drench separating, dilute solution of sodium hydroxide obtains 25% high-quality liquid caustic soda (1438.89kg) through underpressure distillation (6) and enters storage tank; Lime carbonate drying (8) is pulverized (9), and packing becomes finished product lime carbonate (809.44kg) at finishing room.
Embodiment two: the carbide slag of 600kg is modulated into emulsion is reduced into calcium hydroxide and the soda ash mass ratio in pure substance again through purifying: 1: 1.23 ratio is put in the causticization still, temperature of reaction was controlled at 45 degree, obtained the mixing liquid of sodium hydroxide and lime carbonate through 2 hours causticizing reactions.Obtain dilute solution of sodium hydroxide and calcium carbonate wet product through centrifugal washing after pouring separates afterwards, dilute solution of sodium hydroxide obtains 25% high-quality liquid caustic soda (1237.73kg) through underpressure distillation; The lime carbonate drying is pulverized, and packing becomes finished product lime carbonate (696.22kg).
Embodiment three: the carbide slag of 600kg is modulated into emulsion is reduced into calcium hydroxide and the soda ash mass ratio in pure substance again through purifying: 1: 1.63 ratio is put in the causticization still, temperature of reaction was controlled at 50 degree, obtained the mixing liquid of sodium hydroxide and lime carbonate through 5 hours causticizing reactions.Obtain dilute solution of sodium hydroxide and calcium carbonate wet product through centrifugal washing after pouring separates afterwards, dilute solution of sodium hydroxide obtains 25% high-quality liquid caustic soda (1153.15kg) through underpressure distillation; The lime carbonate drying is pulverized, and packing becomes finished product lime carbonate (810.82kg).
Claims (5)
1 one kinds of methods of making low high-quality liquid caustic soda and high-grade calcium carbonate, carrying out chemical reaction by carbide slag and soda ash through abundant stirring obtains, its technical characterictic is that carbide slag and soda ash are according to certain ratio reaction, when producing high-quality liquid caustic soda, go back the co-producing calcium carbonate product.
The described a kind of method of making low high-quality liquid caustic soda and high-grade calcium carbonate of 2 claims 1, its technical characterictic are that carbide slag and soda ash react according to certain ratio, when producing high-quality liquid caustic soda, go back the co-producing calcium carbonate product.Concrete process flow steps is:
Carbide slag acidified purifies and obtains purified calcium hydroxide, and its process is:
The carbide slag water is modulated into emulsion and the mass ratio of dilution hydrochloric acid well in pure substance: 1: the ratio of 0.76-1.16 is put into reactor (1) lining, under stirring slowly, carry out chemical reaction, obtain the calcium chloride mixing solutions, suction filtration gets calcium chloride clear liquor and carbon dust slag.Then calcium chloride and sodium hydroxide according to the mass ratio 1 of pure substance: 0.52-0.92 be input to reactor (2) carry out chemical reaction obtain fine calcium hydroxide mixing solutions suction filtration (3) the clarification of calcium hydroxide filter cake and sodium-chlor.
3 claims 1 and 2 described a kind of methods of making low high-quality liquid caustic soda and high-grade calcium carbonate, its technical characterictic are that carbide slag and soda ash react according to certain ratio, when producing high-quality liquid caustic soda, go back the co-producing calcium carbonate product.Concrete process flow steps is:
The calcium hydroxide that obtains after purifying reconciled under the stirring that the good soda ash of emulsion and dissolving blows slowly in causticization still (4) lining according to pure substance mass ratio 1: 1.23-1.63 again with clear water carry out chemical reaction, temperature of reaction was controlled at the 40-50 degree, obtained the mixing liquid of sodium hydroxide and lime carbonate through 2-5 hour causticizing reaction.Wash through centrifugal (5) afterwards and obtain dilute solution of sodium hydroxide and calcium carbonate wet product after pouring separates, dilute solution of sodium hydroxide enters finishing room (7) through underpressure distillation (6) to 25% sodium hydroxide liquid caustic soda; Lime carbonate drying (8) is pulverized (9), and packing becomes the finished product high-grade calcium carbonate.
The described a kind of method of making low high-quality liquid caustic soda and high-grade calcium carbonate of 4 claims 3, described the carbide slag water is modulated into the mass ratio of the good hydrochloric acid of emulsion and dilution in pure substance: 1: the ratio of 0.76-1.16 is put into reactor (1) lining, under stirring slowly, carry out chemical reaction, obtain the calcium chloride mixing solutions, suction filtration gets calcium chloride clear liquor and carbon dust slag.Then calcium chloride and sodium hydroxide according to the mass ratio 1 of pure substance: 0.52-0.92 be input to reactor (2) carry out chemical reaction obtain fine calcium hydroxide mixing solutions suction filtration (3) the clarification of calcium hydroxide filter cake and sodium-chlor.
The described a kind of method of making low high-quality liquid caustic soda and high-grade calcium carbonate of 5 claims 3, the described calcium hydroxide that obtains after purifying is reconciled under the stirring that the good soda ash of emulsion and dissolving blows slowly in causticization still (4) lining according to pure substance mass ratio 1: 1.23-1.63 again with clear water carried out chemical reaction, temperature of reaction was controlled at the 40-50 degree, obtained the mixing liquid of sodium hydroxide and lime carbonate through 2-5 hour causticizing reaction.Wash through centrifugal (5) afterwards and obtain dilute solution of sodium hydroxide and calcium carbonate wet product after pouring separates, dilute solution of sodium hydroxide enters finishing room (7) through underpressure distillation (6) to 25% sodium hydroxide liquid caustic soda; Lime carbonate drying (8) is pulverized (9), and packing becomes the finished product high-grade calcium carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910041215A CN101654261A (en) | 2009-07-17 | 2009-07-17 | Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate |
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|---|---|---|---|
| CN200910041215A CN101654261A (en) | 2009-07-17 | 2009-07-17 | Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate |
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| CN101654261A true CN101654261A (en) | 2010-02-24 |
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| CN200910041215A Pending CN101654261A (en) | 2009-07-17 | 2009-07-17 | Method for manufacturing low-grade and high-quality liquid caustic soda and top grade calcium carbonate |
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2009
- 2009-07-17 CN CN200910041215A patent/CN101654261A/en active Pending
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Open date: 20100224 |