CN101648720A - Method for producing granular sodium hydroxide and high-grade calcium carbonate by using carbide slags - Google Patents
Method for producing granular sodium hydroxide and high-grade calcium carbonate by using carbide slags Download PDFInfo
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- CN101648720A CN101648720A CN200910041213A CN200910041213A CN101648720A CN 101648720 A CN101648720 A CN 101648720A CN 200910041213 A CN200910041213 A CN 200910041213A CN 200910041213 A CN200910041213 A CN 200910041213A CN 101648720 A CN101648720 A CN 101648720A
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- sodium hydroxide
- calcium
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- calcium carbonate
- carbide slag
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Abstract
The invention discloses a method for producing granular sodium hydroxide and co-producing high-grade calcium carbonate by using carbide slags. The main technical scheme is as follows: the carbide slags and soda ash undergo chemical reaction according to a certain proportion to generate mixed liquor of sodium hydroxide and calcium carbonate; dilute sodium hydroxide solution is obtained by centrifuging and is directly distilled to obtain solid granular sodium hydroxide; the calcium carbonate is obtained by washing, drying, grinding and packaging filter cakes. The method effectively lowers the production cost of solid granular sodium hydroxide, increases the productivity of the sodium hydroxide through washing and recycling, simultaneously controls the discharge of three wastes and produces the 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 granular sodium hydroxide and high-grade calcium carbonate with carbide slag.
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 and a kind ofly make the method for granular sodium hydroxide 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 with carbide slag.
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 obtains granular solids sodium hydroxide and enters finishing room (7) through broken, granulation (9) through underpressure distillation (6); 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 the granulation of 9------solid caustic soda.
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 pouring separates, dilute solution of sodium hydroxide obtains solid sodium hydroxide through underpressure distillation (6), obtains particulate state sodium hydroxide through the tablets press granulation; (647.54kg) enter 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 solid granular sodium hydroxide (556.98kg) 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 solid granular sodium hydroxide (518.92kg) through underpressure distillation; The lime carbonate drying is pulverized, and packing becomes finished product lime carbonate (810.82kg).
Claims (5)
1 one kinds of carbide slags are made the method for granular sodium hydroxide and co-producing 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 granular sodium hydroxide, go back the co-producing calcium carbonate product.
The described a kind of carbide slag of 2 claims 1 is made the method for granular sodium hydroxide and co-producing calcium carbonate, and its technical characterictic is that carbide slag and soda ash react according to certain ratio, when producing granular sodium hydroxide, 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 carbide slags are made the method for massive sodium hydroxide and co-producing lime carbonate, and its technical characterictic is that carbide slag and soda ash react according to certain ratio, when producing blocky sodium hydroxide, 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 obtains granular solids sodium hydroxide and enters finishing room (7) through broken, granulation (9) through underpressure distillation (6); Lime carbonate drying (8) is pulverized (9), and packing becomes the finished product high-grade calcium carbonate.
The described a kind of carbide slag of 4 claims 3 is made the method for massive sodium hydroxide and co-producing lime carbonate, 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 carbide slag of 5 claims 3 is made the method for massive sodium hydroxide and co-producing lime carbonate, 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 obtains granular solids sodium hydroxide and enters finishing room (7) through broken, granulation (9) through underpressure distillation (6); Lime carbonate drying (8) is pulverized (9), and packing becomes the finished product high-grade calcium carbonate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910041213A CN101648720A (en) | 2009-07-17 | 2009-07-17 | Method for producing granular sodium hydroxide and high-grade calcium carbonate by using carbide slags |
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| CN200910041213A CN101648720A (en) | 2009-07-17 | 2009-07-17 | Method for producing granular sodium hydroxide and high-grade calcium carbonate by using carbide slags |
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2009
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