CN102092697A - Method for producing ordinary zinc phosphate and caustic soda by using sodium hydrosulfite filtration residues - Google Patents
Method for producing ordinary zinc phosphate and caustic soda by using sodium hydrosulfite filtration residues Download PDFInfo
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- CN102092697A CN102092697A CN2010102754490A CN201010275449A CN102092697A CN 102092697 A CN102092697 A CN 102092697A CN 2010102754490 A CN2010102754490 A CN 2010102754490A CN 201010275449 A CN201010275449 A CN 201010275449A CN 102092697 A CN102092697 A CN 102092697A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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Abstract
The invention provides a method for producing ordinary zinc phosphate and caustic soda by using sodium hydrosulfite filtration residues, which comprises the following steps of: crushing the sodium hydrosulfite filtration residues to prepare suspension; reacting the suspension with solution of sodium phosphate according to the pure substance mass ratio of zinc hydroxide to sodium phosphate of 0.90 to 1.30 to obtain a mixture containing zinc phosphate precipitates and sodium hydroxide; filtering the mixture to obtain a zinc phosphate filter cake and sodium hydroxide filtrate; performing washing, drying and crushing on the zinc phosphate filter cake to obtain zinc phosphate powder products; and distilling the obtained sodium hydroxide filtrate, discharging and cooling the distilled sodium hydroxide filtrate to obtain sodium hydroxide solids when 85 percent of water is distilled, and crushing the obtained sodium hydroxide solids to obtain caustic soda blocks.
Description
Technical field
The present invention relates to the technical field of the improvement and the utilization of waste residue, particularly a kind of method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue.
Background technology
Vat powder is being commonly called as of V-Brite B (Sodium Hydrosulfite), is a kind of strong reductant, is widely used in weaving, printing and dyeing industry, make dyeing auxiliaries and SYNTHETIC OPTICAL WHITNER, also be medicine industry simultaneously, the raw material of synthetic dyestuff also is applied to copperplate printing and analytical reagent etc.
In recent years, market is vigorous day by day to the demand of vat powder, growth is very fast.Particularly weaving, printing and dyeing industry grow steadily to the vat powder demand, and 10～15% ascensional range is all arranged every year.In addition, be accompanied by the production exploitation of domestic high-grade newsprinting paper, the raising of kaolin quality, this potential vat powder market slowly highlights, and market potential is also in quick increase.At present, the total consumption of international insurance powder is 500,000 tons/year; China's 07 annual export volume is 8～100,000 tons/year; 08 annual export volume is 12～150,000 tons; 09 annual export volume is near 200,000 tons; Export volume obviously increases, and is maximum in the world vat powder export State.And domestic consumption is greatly about 20～250,000 tons/year.
The production method of vat powder mainly contains zinc powder method, sodium formate method and amalgamation process.At present, it mainly is preceding two kinds for industrial application.Wherein, the three wastes of sodium amalgam method production technique are handled and labour protection requires comparatively strictness, and power consumption is higher, seldom is used industrial.Sodium formate method production technology maturation, flow process is brief, and the waste water generation is few, but product purity is lower, less stable; And zinc powder method mature production technology, product purity height, good stability are the main production methods of using in the industry.
It is to be sulfur dioxide gas processing zinc powder aqueous suspension more than 99% with purity that the zinc powder method is produced vat powder, generate the SODIUM HYDROSULPHITE zinc solution, add sodium hydroxide then and carry out replacement(metathesis)reaction, generate V-Brite B and zinc hydroxide precipitation, obtain containing V-Brite B after the filtering separation and contain the sedimentary waste residue of zinc hydroxide.Filtrate is saltoutd with strong brine, more after filtration, separate, after the dehydration, with washing with alcohol, drying and must V-Brite B.Thereby the production process of vat powder has been discharged the filter cake waste residue that contains zinc hydroxide in a large number through press filtration.The zinc hydroxide waste residue is a kind of strong alkaline substance, is piled up if do not handle the corrosion in soil and alkalescence to be solidified all very serious, and especially the white dust kicked up of wind makes us suffocating especially.At present, Chang Yong treatment process is for recycling with zinc hydroxide waste residue oxygenerating zinc or metallic zinc.Its purposes is comparatively single, can not consume the increase that is accompanied by the vat powder turnout far away and the zinc powder waste residue that increases day by day.
Summary of the invention
The objective of the invention is to, a kind of method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue is provided, this method turns waste into wealth, effectively the zinc hydroxide in the vat powder filter residue is converted into zinc phosphate and the coproduction caustic soda that has than the large economy meaning, fully excavate and utilized vat powder filter residue potential economic worth, also comprehensive utilization and the improvement for the vat powder filter residue provides new approach.
Technical scheme of the present invention is as follows: a kind of method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue comprises following concrete steps:
Steps A: the content of zinc hydroxide in the filter residue of conversion vat powder, and, be configured to suspension liquid with the pulverizing of vat powder filter residue, dispose sodium radio-phosphate,P-32 solution simultaneously;
Step B: is that 0.90-1.30 puts in first corrosion-resistant reactor (1) with the suspension liquid of steps A configuration and sodium carbonate solution by the mass ratio of zinc hydroxide and sodium phosphate pure substance, and reaction obtains the mixture of phosphoric acid zinc precipitation and sodium hydroxide;
Step C: the mixture of phosphoric acid zinc precipitation and sodium hydroxide is filtered through filter (2), obtain zinc phosphate filter cake and sodium hydroxide filtrate;
Step D: with the zinc phosphate filter cake of step C gained again with an amount of zinc hydroxide reaction, so that the phosphate transfection beyond the zinc phosphate is turned to zinc phosphate, then, again with the reaction of an amount of sodium phosphate, insoluble solid salt is converted into the sodium salt of solubility, after filtration, obtain purified zinc phosphate filter cake, purified zinc phosphate filter cake is through washing machine (3) washing, moisture eliminator (4) drying, and pulverizer (5) is pulverized, and obtains zinc phosphate powder product (6).；
Step e: the sodium hydroxide filtrate of step C gained is sent into distillation in the distiller (7), when the water yield steams 95%, discharge cooling, obtain sodium hydrate solid, pulverize, obtain block caustic soda (9) through second pulverizer (8).
In the step e, when distilling the water yield when steaming 70%, there is crystallization to separate out, then solution is discharged from distiller (7), filter through second strainer (10), removing decrystallizes continues to be fed into and distills the water yield in the distiller 7 and steam 95%, discharge cooling, obtain sodium hydrate solid, pulverize, obtain block caustic soda (9) through second pulverizer (8).
The zinc phosphate filter cake of step C gained again with the reaction of an amount of zinc hydroxide, so that the phosphate transfection beyond the zinc phosphate is turned to zinc phosphate, then, again with the reaction of an amount of sodium phosphate, insoluble solid salt is converted into the sodium salt of solubility, after filtration, obtain purified zinc phosphate filter cake, purified zinc phosphate filter cake is through washing machine (3) washing, moisture eliminator (4) drying, and pulverizer (5) is pulverized, and obtains zinc phosphate powder product (6).
The chemical principle of producing the method for common zinc carbonate coproduction caustic soda with the vat powder filter residue of the present invention is:
3Zn(OH)
2+2Na
3PO
4＝＝＝＝＝Zn
3(PO
4)
2+6NaOH
The invention has the beneficial effects as follows: method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue of the present invention, effectively the zinc hydroxide in the vat powder filter residue is converted into the zinc phosphate that has than the large economy meaning, fully excavate and utilized vat powder filter residue potential economic worth, also comprehensive utilization and the improvement for the vat powder filter residue provides new approach.Simultaneously, this method is simple to operate, and the facility investment expense is low, and by product is few, is suitable for applying.
Description of drawings
Fig. 1 is a process flow sheet of producing the method for common zinc phosphate coproduction caustic soda with the vat powder filter residue of the present invention, wherein, (1)--first corrosion-resistant reactor, (2)--strainer, (3)--washing machine, (4)--moisture eliminator, (5)--pulverizer, (6)--zinc phosphate powder product, (7)--distiller, (8)--second pulverizer, (9)--block caustic soda.
Fig. 2 is a gained sodium hydroxide filtrate when distilling in distiller (7), has crystallization to separate out, the time need the process flow sheet of filtering and impurity removing, wherein, (10)--second strainer.
Embodiment
Embodiment 1
With reference to Fig. 1, a kind of method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue comprises following concrete steps: weighing 495kg vat powder, the content of zinc hydroxide is 297kg in the filter residue of conversion vat powder, and, be configured to suspension liquid with the pulverizing of vat powder filter residue, dispose sodium radio-phosphate,P-32 solution simultaneously; Is to put in first corrosion-resistant reactor (1) at 1: 1.1 suspension liquid and sodium radio-phosphate,P-32 solution by the mass ratio of zinc hydroxide and sodium phosphate pure substance, and reaction obtains the mixture of phosphoric acid zinc precipitation and sodium hydroxide; The mixture of zinc phosphate precipitation and sodium hydroxide is filtered through filter (2), obtain zinc phosphate filter cake and sodium hydroxide filtrate; Through washing machine (3) washing, moisture eliminator (4) drying, pulverizer (5) is pulverized, and obtains zinc phosphate powder product (6) with the zinc phosphate filter cake, and the quality of the zinc phosphate pure substance that it contains is 384.99kg; With sodium hydroxide filtrate send into distillation in the distiller (7), when the water yield steams 95%, discharge cooling, obtain sodium hydrate solid, pulverize through second pulverizer (8), obtain block caustic soda (9), the quality of the sodium hydroxide pure substance that it contains is 240kg.
With reference to Fig. 1, a kind of method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue comprises following concrete steps: weighing 495kg vat powder, the content of zinc hydroxide is 297kg in the filter residue of conversion vat powder, and, be configured to suspension liquid with the pulverizing of vat powder filter residue, dispose sodium radio-phosphate,P-32 solution simultaneously; Is to put in first corrosion-resistant reactor (1) at 1: 1.30 suspension liquid and sodium radio-phosphate,P-32 solution by the mass ratio of zinc hydroxide and sodium phosphate pure substance, and reaction obtains the mixture of phosphoric acid zinc precipitation and sodium hydroxide; The mixture of zinc phosphate precipitation and sodium hydroxide is filtered through filter (2), obtain zinc phosphate filter cake and sodium hydroxide filtrate; The zinc phosphate filter cake of gained again with the reaction of an amount of zinc hydroxide, so that the phosphate transfection beyond the zinc phosphate is turned to zinc phosphate, then, again with an amount of sodium phosphate reaction, insoluble solid salt is converted into the sodium salt of solubility, after filtration, obtain purified zinc phosphate filter cake, purified zinc phosphate filter cake is through washing machine (3) washing, moisture eliminator (4) drying, and pulverizer (5) is pulverized, obtain zinc phosphate powder product (6), the quality of the zinc phosphate pure substance that it contains is 384.99kg; With sodium hydroxide filtrate send into distillation in the distiller (7), with reference to Fig. 2,, there is crystallization to separate out when distilling the water yield when steaming 70%, solution is discharged from distiller (7), filter through second strainer (10), removing decrystallizes continues to be fed into and distills the water yield in the distiller (7) and steam 95%, discharges cooling, obtain sodium hydrate solid, pulverize through second pulverizer (8), obtain block caustic soda (9), the quality of the sodium hydroxide pure substance that it contains is 240kg.
Embodiment 3
With reference to Fig. 1, a kind of method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue comprises following concrete steps: weighing 495kg vat powder, the content of zinc hydroxide is 297kg in the filter residue of conversion vat powder, and, be configured to suspension liquid with the pulverizing of vat powder filter residue, dispose sodium radio-phosphate,P-32 solution simultaneously; Is to put in first corrosion-resistant reactor (1) at 1: 0.90 suspension liquid and sodium radio-phosphate,P-32 solution by the mass ratio of zinc hydroxide and sodium phosphate pure substance, and reaction obtains the mixture of phosphoric acid zinc precipitation and sodium hydroxide; The mixture of zinc phosphate precipitation and sodium hydroxide is filtered through filter (2), obtain zinc phosphate filter cake and sodium hydroxide filtrate; Through washing machine (3) washing, moisture eliminator (4) drying, pulverizer (5) is pulverized with the zinc phosphate filter cake, and the quality that obtains its zinc phosphate pure substance that contains of zinc phosphate powder product (6) is 313.74kg; With sodium hydroxide filtrate send into distillation in the distiller (7), with reference to Fig. 2,, there is crystallization to separate out when distilling the water yield when steaming 70%, solution is discharged from distiller (7), filter through second strainer (10), removing decrystallizes continues to be fed into and distills the water yield in the distiller (7) and steam 95%, discharges cooling, obtain sodium hydrate solid, pulverize through second pulverizer (8), obtain block caustic soda (9), the quality of the sodium hydroxide pure substance that it contains is 195.60kg.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, its framework form can be flexible and changeable, can the subseries method.Just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (3)
1. a method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue is characterized in that, comprises following concrete steps:
Steps A: the content of zinc hydroxide in the filter residue of conversion vat powder, and, be configured to suspension liquid with the pulverizing of vat powder filter residue, dispose sodium radio-phosphate,P-32 solution simultaneously;
Step B: is that 0.90-1.30 puts in first corrosion-resistant reactor (1) with the suspension liquid of steps A configuration and sodium carbonate solution by the mass ratio of zinc hydroxide and sodium phosphate pure substance, and reaction obtains the mixture of phosphoric acid zinc precipitation and sodium hydroxide;
Step C: the mixture of phosphoric acid zinc precipitation and sodium hydroxide is filtered through filter (2), obtain zinc phosphate filter cake and sodium hydroxide filtrate;
Step D: through washing machine (3) washing, moisture eliminator (4) drying, pulverizer (5) is pulverized, and obtains zinc phosphate powder product (6) with the zinc phosphate filter cake of step C gained;
Step e: the sodium hydroxide filtrate of step C gained is sent into distillation in the distiller (7), when the water yield steams 95%, discharge cooling, obtain sodium hydrate solid, pulverize, obtain block caustic soda (9) through second pulverizer (8).
2. method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue as claimed in claim 1, it is characterized in that, in the step e, when distilling the water yield when steaming 70%, there is crystallization to separate out, then solution is discharged from distiller (7), filter through second strainer (10), removing decrystallizes continues to be fed into and distills the water yield in the distiller 7 and steam 95%, discharge cooling, obtain sodium hydrate solid, pulverize, obtain block caustic soda (9) through second pulverizer (8).
3. method of producing common zinc phosphate coproduction caustic soda with the vat powder filter residue as claimed in claim 1, it is characterized in that, the zinc phosphate filter cake of step C gained again with the reaction of an amount of zinc hydroxide, so that the phosphate transfection beyond the zinc phosphate is turned to zinc phosphate, then, again with an amount of sodium phosphate reaction, insoluble solid salt is converted into the sodium salt of solubility, after filtration, obtain purified zinc phosphate filter cake, purified zinc phosphate filter cake is through washing machine (3) washing, moisture eliminator (4) drying, and pulverizer (5) is pulverized, and obtains zinc phosphate powder product (6).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118183658A (en) * | 2024-03-26 | 2024-06-14 | 湖北虹润高科新材料有限公司 | Low-sulfur high-iron-phosphorus-ratio ferric phosphate and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118183658A (en) * | 2024-03-26 | 2024-06-14 | 湖北虹润高科新材料有限公司 | Low-sulfur high-iron-phosphorus-ratio ferric phosphate and preparation method and application thereof |
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Application publication date: 20110615 |