CN102978418A - Processing method of casting zinc dross - Google Patents
Processing method of casting zinc dross Download PDFInfo
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- CN102978418A CN102978418A CN2012105239791A CN201210523979A CN102978418A CN 102978418 A CN102978418 A CN 102978418A CN 2012105239791 A CN2012105239791 A CN 2012105239791A CN 201210523979 A CN201210523979 A CN 201210523979A CN 102978418 A CN102978418 A CN 102978418A
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- reverse osmosis
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000011701 zinc Substances 0.000 title claims abstract description 74
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 69
- 238000005266 casting Methods 0.000 title claims abstract description 40
- 238000003672 processing method Methods 0.000 title abstract 4
- 238000005406 washing Methods 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 57
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 238000000909 electrodialysis Methods 0.000 claims abstract description 36
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 239000008399 tap water Substances 0.000 claims abstract description 27
- 235000020679 tap water Nutrition 0.000 claims abstract description 27
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000001110 calcium chloride Substances 0.000 claims abstract description 9
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 56
- 230000002000 scavenging effect Effects 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000000047 product Substances 0.000 abstract description 15
- 238000000926 separation method Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000460 chlorine Substances 0.000 abstract description 6
- 229910052801 chlorine Inorganic materials 0.000 abstract description 6
- 239000002351 wastewater Substances 0.000 abstract description 5
- 239000012528 membrane Substances 0.000 abstract description 3
- 239000000706 filtrate Substances 0.000 abstract 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 3
- 239000000920 calcium hydroxide Substances 0.000 abstract 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 1
- 230000008016 vaporization Effects 0.000 abstract 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 29
- 238000006298 dechlorination reaction Methods 0.000 description 19
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 18
- 239000011592 zinc chloride Substances 0.000 description 14
- 235000005074 zinc chloride Nutrition 0.000 description 14
- 239000011787 zinc oxide Substances 0.000 description 9
- 230000001698 pyrogenic effect Effects 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000003500 flue dust Substances 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 150000004677 hydrates Chemical class 0.000 description 3
- 238000005200 wet scrubbing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 2
- 229940007718 zinc hydroxide Drugs 0.000 description 2
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical group 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical group [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- -1 soda ash Chemical compound 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009858 zinc metallurgy Methods 0.000 description 1
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical group [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a processing method of casting zinc dross. The processing method comprises the steps of adding water and the casting zinc dross into a washing trough when stirring at room temperature, adjusting the final pH value of washing liquid to 9-11 using hydrated lime powder, washing the casting zinc dross for 10-30 minutes, filtering to obtain filtrate and filtration residue, washing the filtration residue using tap water at room temperature and in the liquid-solid ratio of (3:1):(5:1) for 10-30 minutes, filtering to obtain the filtrate and filtration residue, returning the filtration residue to a zinc system to produce electrodeposited zinc, returning the filtrate to the lime water washing procedure, subjecting the lime water washed filtrate to electrodialysis concentration,subjecting the electrodialysis purified liquid to the separation treatment by means of reverse osmosis membrane technology, returning the reverse osmosis concentrated liquid to the electrodialysis procedure for processing, returning the reverse osmosis membrane purified liquid to the tap water washing procedure, and vaporizing and concentrating the electrodialysis concentrated liquid to produce the product of calcium chloride. By adopting the processing method provided by the invention, chlorine can be fast removed from the casting zinc dross, the metal zinc can be recycled, the product of calcium chloride can be simultaneously produced, and the whole process procedures do not produce waste water.
Description
Technical field
The present invention relates to smelting field of nonferrous metal, particularly a kind for the treatment of process of casting mold zinc dross.
Background technology
The casting mold zinc dross be the negative electrode zinc metal sheet in fusion-cast zinc ingot metal process output contain zinc 70～85%, chloride 1.0～3.0% scum silica frost; Zinc mainly exists with the zinc oxide form, small portion is metallic zinc and zinc chloride, the major impurity element of casting mold zinc dross is chlorine, chlorine mainly exists with the zinc chloride form, other impurity such as iron, lead, arsenic, antimony, copper, cadmium etc. are all very low, according to the Chemical Composition of casting mold zinc dross, process if can carry out dechlorination to the casting mold scum silica frost, be a kind of very desirable zinc metallurgy raw material through the casting mold zinc dross after the dechlorination so.
At present, mainly contain following several to the treatment process of casting mold zinc dross:
1, multiple hearth furnace pyrogenic process dechlorination.Adopt multiple hearth furnace pyrogenic process dechlorination process to process the casting mold zinc dross, mainly be to utilize the zinc chloride boiling point in the casting mold zinc dross low than zinc oxide, under 750～850 ℃ of the temperature and atmospheric condition of multiple hearth furnace operation control, the zinc chloride volatilization enters flue gas, and along with the cooling of flue gas, enter in the bag dust, zinc oxide is non-volatile, under the promotion of mechanical stirrer, at the bottom of the multiple hearth furnace out.Multiple hearth furnace pyrogenic process dechlorination rate reaches more than 90%, and the casting mold scum silica frost after the dechlorination is chloride to be reduced to below 0.2%, and product can satisfy electric zinc raw material and the requirement of furnace zinc powder raw material fully.It is good that this technique has a dechlorination effect, dechlorination rate reaches more than 90%, plant efficiency is high, and every stove every day can material handling 100 tons, and its shortcoming is to need to consume coal gas, the zinc chloride that is isolated in the cloth bag flue dust can't use by Returning process, reduced the rate of recovery of zinc, in addition, the flue dust that contains zinc chloride has hygroscopic property, the work-ing life of cloth bag is short, and production cost is high.
2, rotary kiln pyrogenic process dechlorination.Adopt rotary kiln pyrogenic process dechlorination process to process the casting mold zinc dross, its principle is the same with the dechlorination of multiple hearth furnace pyrogenic process, utilize the zinc chloride boiling point in the casting mold zinc dross low than zinc oxide, under 850～1100 ℃ of the temperature and atmospheric condition of revolution operation control, zinc chloride volatilization enters flue gas, and along with the cooling of flue gas, enters in the bag dust, zinc oxide is non-volatile, along with the rotation of kiln body from kiln hood out.Because the service temperature of rotary kiln is higher than multiple hearth furnace, therefore, rotary kiln pyrogenic process dechlorination rate is higher, reaches more than 98%, casting mold scum silica frost after the dechlorination is chloride to be reduced to below 0.05%, and product can satisfy electric zinc raw material, furnace zinc powder raw material and grade zinc oxide ingredient requirement fully.It is good that this technique has a dechlorination effect, dechlorination rate reaches more than 98%, product is chloride to be reduced to below 0.05%, operating process is simple, the workman just can go up post operation through simple training, and its shortcoming is that energy consumption is large, and the zinc chloride of cloth bag flue dust can't use by Returning process, simultaneously because the roasting process exhausting is large, the zinc oxide of some also is pumped in the bag dust, mixes with the zinc chloride that volatilizees, and can't reclaim use, therefore, the zinc metal recovery rate is lower, and in addition, the flue dust that contains zinc chloride has hygroscopic property, the work-ing life of cloth bag is short, and production cost is high.
3, wet scrubbing dechlorination, adopt the wet scrubbing dechlorination process to process the casting mold zinc dross, its principle is to utilize the zinc chloride in the casting mold zinc dross soluble in water, and zinc oxide and metallic zinc are not dissolved in water, under the wash conditions, the zinc chloride dissolving enters solution, and zinc oxide and metallic zinc are deposited in the washed-residue.Through after the solid-liquid separation, reached the purpose of zinc chloride and zinc oxide separation, effective elimination the chlorine element.If in washing process, add the alkaline matter that is dissolvable in water water, such as soda ash, volatile salt, yellow soda ash, lime etc., then the zinc in the solution can be precipitated out, again enter in the slag with zinc hydroxide or zinc subcarbonate form, therefore add the alkaline matter washing that is dissolvable in water water, can effectively reclaim the zinc metal, the rate of recovery of zinc metal can reach more than 99%, casting mold scum silica frost after the once washing dechlorination is chloride to be reduced to about 0.4%, secondary washing can be reduced to below 0.2%, and the secondary washing product can satisfy electric zinc raw material fully, the requirement of furnace zinc powder raw material.It is simple that this technique has operating process, and the workman just can go up post operation through simple training, and the zinc metal recovery rate is high, reaches 99%, and its shortcoming is the output washes, contaminate environment.
Summary of the invention
The treatment process that the purpose of this invention is to provide a kind of casting mold zinc dross; the method is with wet scrubbing dechlorination technology and the abundant combination of wastewater treating technology; not only fully reclaimed the zinc metal in the casting mold zinc dross; also calcium chloride solution is realized low-cost concentrated; output industrial calcium chloride product; technological process is output waste water no longer, effectively protection of the environment.
The present invention is achieved through the following technical solutions above-mentioned purpose: a kind for the treatment of process of casting mold zinc dross comprises the steps:
(1), liming washing: under normal temperature, stirring, weight ratio by liquid/solid is that 3:1～5:1 adds entry and casting mold zinc dross in rinse bath, then regulate the endpoint pH to 9 of washings～11 with dry hydrate, washing casting mold zinc dross 10～30 minutes, filter, obtain the liming washing and filtering liquid of chloride 3.0～6.0 grams per liters and chloride 0.3～0.6% liming washing and filtering slag;
(2), tap water washing: the liming washing and filtering slag that step (1) is obtained, be under the condition of 3:1～5:1 with tap water in normal temperature, liquid-solid ratio, washed 10～30 minutes, filter, obtaining chloride 0.1～0.2% tap water washing and filtering slag returns Zn system and produces electric zinc, tap water washing and filtering liquid returns the liming washing process of step (1)
(3), electrodialysis is concentrated: it is concentrated that the liming washing and filtering liquid of step (1) is carried out electroosmose process, obtains the electrodialysis concentrated solution of chloride 100～200 grams per liters and the electrodialysis scavenging solution of chloride 0.5～2.0 grams per liter,
(4), reverse osmosis isolation: the electrodialysis scavenging solution of chloride 0.5～2.0 grams per liter is carried out separating treatment with reverse osmosis technology; Obtain the reverse osmosis concentrated liquid of chloride 3.0～7.0 grams per liters and the reverse osmosis scavenging solution of chloride 0.05～0.20 grams per liter; Reverse osmosis concentrated liquid returns the electrodialysis process of step (3), and the reverse osmosis scavenging solution returns the tap water washing process of step (2),
(5) evaporating, concentrating and crystallizing: the electrodialysis concentrated solution of chloride 100～200 grams per liters is carried out evaporating, concentrating and crystallizing, manufacture level calcium chloride product.
Outstanding advantages of the present invention is:
Can realize efficiently, fast that the zinc in the casting mold zinc dross separates with chlorine, not only have the high advantage of zinc recovery, and after washing low-cost the concentrating of calcium chloride solution process that obtains, become the calcium chloride Industrial products, process is output waste water no longer, effectively protection of the environment.
In washing process, owing to adopted lime to make pH value conditioning agent, make the zinc chloride in the solution change the zinc hydroxide precipitation into, zinc has obtained recovery, and therefore, the method can guarantee that zinc has the higher rate of recovery, reaches more than 99%.
Adopt electrodialysis tentatively to concentrate to calcium chloride solution, the Chlorine in Solution ionic concn is concentrated to 100～200 grams per liters by 3.0～7.0 grams per liters, reduced by a relatively large margin the solution concentrated cost.
The electrodialysis scavenging solution is carried out isolation processing with reverse osmosis membrane technology, and the reverse osmosis scavenging solution that obtains turns back to washing flow, has realized the zero release of waste water.
Description of drawings
Fig. 1 is the process flow sheet of the treatment process of casting mold zinc dross of the present invention.
Embodiment
By the following examples technical scheme of the present invention is described further.
Embodiment 1
Present embodiment is the first example of the treatment process of casting mold zinc dross of the present invention, comprises the steps:
(1), liming washing: in 30 cubic metres rinse bath, the water that adds 18 cubic metres, stir, temperature is 25 ℃, adds to contain 6 tons of zinc 70%, chloride 1.0% casting mold zinc dross, with 81 kilograms of dry hydrates, regulate the endpoint pH to 9 of washings, washed 10 minutes, and carried out filtering separation, obtain 7.7 tons of 16.5 cubic metres of the liming washing and filtering liquid of chloride 3.1 grams per liters and chloride 0.35% liming washing and filtering wet slags.
(2), tap water washing: in 30 cubic metres rinse bath, the tap water that adds 18 cubic metres, stir, add 7.7 tons of liming washing and filtering wet slags, being 25 ℃ in temperature washed 10 minutes, carry out filtering separation, obtain the washing and filtering water of 7.7 tons of chloride 0.12% tap water washing and filtering wet slags and 18 cubic metres; The washing and filtering wet slag returns Zn system and produces electric zinc, and tap water washing and filtering liquid turns back to the liming washing process of step (1).
(3), electrodialysis is concentrated: 16.5 cubic metres of the liming washing and filtering liquid of chloride 3.1 grams per liters, it is concentrated to carry out electroosmose process, obtains 16.07 cubic metres of the electrodialysis scavenging solutions of 0.42 cubic metre of the electrodialysis concentrated solution of chloride 100 grams per liters and chloride 0.5 grams per liter.
(4), reverse osmosis isolation: 16.07 cubic metres of the electrodialysis scavenging solutions of chloride 0.5 grams per liter carry out reverse osmosis isolation, obtain 13.63 cubic metres of the reverse osmosis scavenging solutions of 2.41 cubic metres of the reverse osmosis concentrated liquids of chloride 3.0 grams per liters and chloride 0.05 grams per liter; 2.41 cubic metres of electrodialysis processes that return step (3) of reverse osmosis concentrated liquid, 13.63 cubic metres of tap water washing process that return step (2) of reverse osmosis scavenging solution.
(5) evaporating, concentrating and crystallizing: 0.42 cubic metre of the electrodialysis concentrated solution of chloride 100 grams per liters, carry out evaporating, concentrating and crystallizing, 83 kilograms of manufacture level calcium chloride products, product purity 97.0%.
Embodiment 2
Present embodiment is the second example of the treatment process of casting mold zinc dross of the present invention, comprises the steps:
(1), liming washing: in 30 cubic metres rinse bath, the water that adds 25 cubic metres, stir, temperature is 25 ℃, adds to contain 6 tons of zinc 78%, chloride 2.0% casting mold zinc dross, with 164 kilograms of dry hydrates, regulate the endpoint pH to 10 of washings, washed 20 minutes, and carried out filtering separation, obtain 7.6 tons of 23.5 cubic metres of the liming washing and filtering liquid of chloride 5.0 grams per liters and chloride 0.46% liming washing and filtering wet slags.
(2), tap water washing: in 30 cubic metres rinse bath, the tap water that adds 25 cubic metres, stir, add 7.6 tons of liming washing and filtering wet slags, being 25 ℃ in temperature washed 20 minutes, carry out filtering separation, obtain the washing and filtering water of 7.6 tons of chloride 0.11% tap water washing and filtering wet slags and 25 cubic metres; The washing and filtering wet slag returns Zn system and produces electric zinc, and tap water washing and filtering liquid turns back to the liming washing process of step (1).
(3), electrodialysis is concentrated: 23.5 cubic metres of the liming washing and filtering liquid of chloride 5.0 grams per liters, it is concentrated to carry out electroosmose process, obtains 22.87 cubic metres of the electrodialysis scavenging solutions of 0.63 cubic metre of the electrodialysis concentrated solution of chloride 150 grams per liters and chloride 1.0 grams per liters.
(4), reverse osmosis isolation: 22.87 cubic metres of the electrodialysis scavenging solutions of chloride 1.0 grams per liters carry out reverse osmosis isolation, obtain 18.67 cubic metres of the reverse osmosis scavenging solutions of 4.20 cubic metres of the reverse osmosis concentrated liquids of chloride 5.0 grams per liters and chloride 0.10 grams per liter; 4.20 cubic metres of electrodialysis processes that return step (3) of reverse osmosis concentrated liquid, 18.67 cubic metres of tap water washing process that return step (2) of reverse osmosis scavenging solution.
(5) evaporating, concentrating and crystallizing: 0.6 cubic metre of the electrodialysis concentrated solution of chloride 150 grams per liters, carry out evaporating, concentrating and crystallizing, 185 kilograms of manufacture level calcium chloride products, product purity 97.8%.
Embodiment 3
Present embodiment is the second example of the treatment process of casting mold zinc dross of the present invention, comprises the steps:
(1), liming washing: in 30 cubic metres rinse bath, the water that adds 25 cubic metres, stir, temperature is 25 ℃, adds to contain 5 tons of zinc 85%, chloride 3.0% casting mold zinc dross, with 206 kilograms of dry hydrates, regulate the endpoint pH to 11 of washings, washed 30 minutes, and carried out filtering separation, obtain 6.4 tons of 23.6 cubic metres of the liming washing and filtering liquid of chloride 6.0 grams per liters and chloride 0.58% liming washing and filtering wet slags.
(2), tap water washing: in 30 cubic metres rinse bath, the tap water that adds 25 cubic metres, stir, add 6.4 tons of liming washing and filtering wet slags, being 25 ℃ in temperature washed 30 minutes, carry out filtering separation, obtain the washing and filtering water of 6.4 tons of chloride 0.13% tap water washing and filtering wet slags and 25 cubic metres; The washing and filtering wet slag returns Zn system and produces electric zinc, and tap water washing and filtering liquid turns back to the liming washing process of step (1).
(3), electrodialysis is concentrated: 23.6 cubic metres of the liming washing and filtering liquid of chloride 6.0 grams per liters, it is concentrated to carry out electroosmose process, obtains 23.12 cubic metres of the electrodialysis scavenging solutions of 0.48 cubic metre of the electrodialysis concentrated solution of chloride 200 grams per liters and chloride 2.0 grams per liters.
(4), reverse osmosis isolation: 23.12 cubic metres of the electrodialysis scavenging solutions of chloride 2.0 grams per liters carry out reverse osmosis isolation, obtain 17.01 cubic metres of the reverse osmosis scavenging solutions of 6.11 cubic metres of the reverse osmosis concentrated liquids of chloride 7.0 grams per liters and chloride 0.20 grams per liter; 6.11 cubic metres of electrodialysis processes that return step (3) of reverse osmosis concentrated liquid, 17.01 cubic metres of tap water washing process that return step (2) of reverse osmosis scavenging solution.
(5) evaporating, concentrating and crystallizing: 0.48 cubic metre of the electrodialysis concentrated solution of chloride 200 grams per liters, carry out evaporating, concentrating and crystallizing, 191 kilograms of manufacture level calcium chloride products, product purity 96.3%.
Claims (2)
1. the treatment process of a casting mold zinc dross is characterized in that, the method comprises the steps:
(1), liming washing: under normal temperature, stirring, weight ratio by liquid/solid is that 3:1～5:1 adds entry and casting mold zinc dross in rinse bath, then regulate the endpoint pH to 9 of washings～11 with lime powder, washing casting mold zinc dross 10～30 minutes, filter, obtain the liming washing and filtering liquid of chloride 3.0～6.0 grams per liters and chloride 0.3～0.6% liming washing and filtering slag;
(2), tap water washing: the liming washing and filtering slag that step (1) is obtained, be under the condition of 3:1～5:1 with tap water in normal temperature, liquid-solid ratio, washed 10～30 minutes, filter, obtaining chloride 0.1～0.2% tap water washing and filtering slag returns Zn system and produces electric zinc, tap water washing and filtering liquid returns the liming washing process of step (1)
(3), electrodialysis is concentrated: it is concentrated that the liming washing and filtering liquid of step (1) is carried out electroosmose process, obtains the electrodialysis concentrated solution of chloride 100～200 grams per liters and the electrodialysis scavenging solution of chloride 0.5～2.0 grams per liter,
(4), reverse osmosis isolation: the electrodialysis scavenging solution of chloride 0.5～2.0 grams per liter is carried out separating treatment with reverse osmosis technology; Obtain the reverse osmosis concentrated liquid of chloride 3.0～7.0 grams per liters and the reverse osmosis scavenging solution of chloride 0.05～0.20 grams per liter; Reverse osmosis concentrated liquid returns the electrodialysis process of step (3), and the reverse osmosis scavenging solution returns the tap water washing process of step (2),
(5) evaporating, concentrating and crystallizing: the electrodialysis concentrated solution of chloride 100～200 grams per liters is carried out evaporating, concentrating and crystallizing, manufacture level calcium chloride product.
2. the treatment process of casting mold zinc dross according to claim 1 is characterized in that, described casting mold zinc dross be the negative electrode zinc metal sheet in fusion-cast zinc ingot metal process output contain zinc 70～85%, chloride 1.0～3.0% scum silica frost.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194619A (en) * | 2013-04-23 | 2013-07-10 | 吴鋆 | Fusion casting method of cathode zinc sheets |
| CN103627888A (en) * | 2013-12-12 | 2014-03-12 | 重庆大学 | Dechlorination method of chlorine rhodochrosite |
| CN103739132A (en) * | 2014-01-02 | 2014-04-23 | 杭州深瑞水务有限公司 | High-salinity industrial wastewater reusing treatment process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0889141A1 (en) * | 1996-02-16 | 1999-01-07 | Aichi Steel Works, Ltd. | Zinc oxide-containing waste processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103194619A (en) * | 2013-04-23 | 2013-07-10 | 吴鋆 | Fusion casting method of cathode zinc sheets |
| CN103627888A (en) * | 2013-12-12 | 2014-03-12 | 重庆大学 | Dechlorination method of chlorine rhodochrosite |
| CN103739132A (en) * | 2014-01-02 | 2014-04-23 | 杭州深瑞水务有限公司 | High-salinity industrial wastewater reusing treatment process |
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