WO1994008057B1 - Method for the enhanced recovery of zinc oxide - Google Patents
Method for the enhanced recovery of zinc oxideInfo
- Publication number
- WO1994008057B1 WO1994008057B1 PCT/US1993/008497 US9308497W WO9408057B1 WO 1994008057 B1 WO1994008057 B1 WO 1994008057B1 US 9308497 W US9308497 W US 9308497W WO 9408057 B1 WO9408057 B1 WO 9408057B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- zinc
- product solution
- compounds
- solution
- temperature
- Prior art date
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract 38
- 239000011787 zinc oxide Substances 0.000 title claims abstract 19
- 238000011084 recovery Methods 0.000 title claims abstract 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract 31
- 229910052725 zinc Inorganic materials 0.000 claims abstract 31
- 239000011701 zinc Substances 0.000 claims abstract 31
- 239000002184 metal Substances 0.000 claims abstract 26
- 229910052751 metal Inorganic materials 0.000 claims abstract 26
- 239000002699 waste material Substances 0.000 claims abstract 24
- 150000003752 zinc compounds Chemical class 0.000 claims abstract 21
- 239000011133 lead Substances 0.000 claims abstract 17
- 229940100888 zinc compounds Drugs 0.000 claims abstract 16
- 229910052793 cadmium Inorganic materials 0.000 claims abstract 15
- 150000001875 compounds Chemical class 0.000 claims abstract 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract 10
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract 7
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract 7
- QDHHCQZDFGDHMP-UHFFFAOYSA-N monochloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 claims abstract 7
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract 6
- 229910052742 iron Inorganic materials 0.000 claims abstract 5
- 238000001035 drying Methods 0.000 claims abstract 4
- 238000005406 washing Methods 0.000 claims abstract 4
- 239000000463 material Substances 0.000 claims abstract 3
- HLTJBEMUWFJRBP-UHFFFAOYSA-L zinc;azanide;dichloride Chemical compound [NH2-].[NH2-].[Cl-].[Cl-].[Zn+2] HLTJBEMUWFJRBP-UHFFFAOYSA-L 0.000 claims abstract 3
- 238000001816 cooling Methods 0.000 claims abstract 2
- 239000000047 product Substances 0.000 claims 52
- 239000002270 dispersing agent Substances 0.000 claims 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims 10
- 229910000460 iron oxide Inorganic materials 0.000 claims 10
- -1 cadmium metals Chemical class 0.000 claims 9
- 239000007787 solid Substances 0.000 claims 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 7
- 238000004064 recycling Methods 0.000 claims 6
- 230000002776 aggregation Effects 0.000 claims 4
- 238000004220 aggregation Methods 0.000 claims 4
- 239000002244 precipitate Substances 0.000 claims 4
- 230000001376 precipitating Effects 0.000 claims 3
- 230000003381 solubilizing Effects 0.000 claims 3
- VHOWDPHADPBJTA-UHFFFAOYSA-M [Cl-].N[Zn]N Chemical compound [Cl-].N[Zn]N VHOWDPHADPBJTA-UHFFFAOYSA-M 0.000 claims 2
- 229910001431 copper ion Inorganic materials 0.000 claims 2
- ABLZXFCXXLZCGV-UHFFFAOYSA-L CHEBI:8154 Chemical class [O-]P([O-])=O ABLZXFCXXLZCGV-UHFFFAOYSA-L 0.000 claims 1
- 229920001732 Lignosulfonate Polymers 0.000 claims 1
- 229920000388 Polyphosphate Polymers 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 1
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 125000002467 phosphate group Chemical class [H]OP(=O)(O[H])O[*] 0.000 claims 1
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims 1
- 229920000058 polyacrylate Polymers 0.000 claims 1
- 229920000193 polymethacrylate Polymers 0.000 claims 1
- 239000001205 polyphosphate Substances 0.000 claims 1
- 235000011176 polyphosphates Nutrition 0.000 claims 1
- 229920003169 water-soluble polymer Polymers 0.000 claims 1
- 239000002440 industrial waste Substances 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 abstract 1
Abstract
A method for the recovery of zinc oxide from industrial waste materials of various components, including zinc, lead, iron and cadmium, by roasting the waste material at an elevated temperature, treating the waste material with an ammonium chloride solution maintained at an elevated temperature, separating the undissolved components from the solution, treating the solution with zinc metal to displace undesired metal ions from the solution, cooling the solution to precipitate therefrom zinc compounds, washing the precipitated zinc compounds to remove unwanted compounds such as diamino zinc dichloride, and drying the remaining zinc compound which is essentially hydrated zinc oxide, resulting in essentially pure zinc oxide.
Claims
AMENDED CLAIMS
[received by the International Bureau on 15 February 1994 (15.02.94); original claims 1, 15, 26 and 31 amended; remaining claims unchanged (6 pages)]
1. A continuous method for the recovery of zinc oxide from waste material streams which comprise zinc compounds, comprising the steps of: a. roasting said waste material at an elevated temperature and in a reducing atmosphere; b. treating said waste material with an ammonium chloride solution at an elevated temperature to form a product solution which comprises dissolved zinc and dissolved zinc oxide whereby any iron oxide in said waste material will not go into solution; c. separating said product solution from any undissolved materials present in said product solution including any of said iron oxide; d. adding zinc metal and a dispersant to said product solution whereby any lead and copper ions contained within said product solution are displaced by said zinc metal and precipitate out of said product solution as lead and cadmium metals and said dispersant is selected from the group consisting of dispersants which will prevent the aggregation of said zinc metal; e. separating said product solution from the lead and cadmium metals; f. lowering the temperature of said product solution thereby precipitating the zinc component as a mixture of crystallized zinc compounds; g. separating said precipitated zinc compounds from said product solution; h. washing said zinc compounds solids with a wash water thereby solubilizing certain of said zinc compounds; i. separating the remaining zinc compounds solids from said solution; and then j. drying said remaining zinc compounds solids at a temperature of between about 100°C and 200°C whereby said resulting product is zinc oxide of 99% or greater purity.
2. The method as described in Claim 1, wherein said product solution of step d is maintained at a temperature of at least 90°C.
AMENDED SHEEHAWi E W
13. The method as described in Claim 12, wherein said dispersant is selected from the group consisting of water soluble polymers.
14. The method as described in Claim 13, wherein said dispersant is selected from the group consisting of maleic based acrylic oligmers, lignosulfonates, polyphosphates, polyacrylates, polymethacrylates, maleic anhydride copolymers, polymaleic anhydride, phosphate esters, and phosphonates.
15. A continuous method for the recovery of zinc oxide from waste material streams which comprise zinc compounds, comprising the steps of: a. treating said waste material a first time with an ammonium chloride solution at an elevated temperature to form a first product solution which comprises dissolved zinc and dissolved zinc oxide whereby any iron oxide in said waste material will not go into.solution; b. separating said first product solution from the undissolved waste material compounds present in said first product solution including any of said iron oxide; c. roasting said undissolved waste material compounds at an elevated temperature and in a reducing atmosphere; d. treating said roasted undissolved waste material compounds a second time with said ammonium chloride solution at an elevated temperature to form a second product solution which comprises dissolved zinc and dissolved zinc oxide whereby any iron oxide remaining in said roasted undissolved waste material compounds will not go into solution; e. combining said first and second product solutions to form a combined product solution and adding zinc metal and a dispersant to said combined product solution whereby any lead and copper ions contained within said combined product solution are displaced by said zinc metal and precipitate out of said combined product solution as lead and cadmium metals and said dispersant is selected from the group consisting of dispersants which will prevent the aggregation of said zinc metal;
21. The method as described in Claim 20, wherein the lowering of the temperature of said combined product solution is accomplished using a reverse natural cooling profile.
22. The method as described in Claim 15, wherein said wash water has a termperature of between about 25°C and 100°C.
23. The method as described in Claim 15, further comprising the step of recycling said solution after the zinc component is precipitated therefrom in step g to be reemployed in steps a and d.
24. The method as described in Claim 15, further comprising the step of recycling said wash water after said zinc oxide is separated therefrom to be reemployed in step h.
25. The method as described in Claim 15, further comprising the step of adding a dispersant to said combined product solution concurrently while adding zinc metal to said combined product solution in step e.
26. A continuoμs method for the recovery of zinc oxide from waste materials which comprise compounds of zinc, iron, lead and cadmium, comprising the steps of: a. roasting said waste material at a temperature of at least 500°C and in a reducing atmosphere; b. treating said waste material with an ammonium chloride solution maintained at a temperature of at least 90°C to form a product solution which comprises compounds of zinc, lead and cadmium whereby any iron oxide in said waste material will not go into solution; c. separating said product solution from the undissolved compounds of iron and any other undissolved materials present in said product solution including any of said iron oxide; d. adding zinc metal and a dispersant to said product solution whereby the lead and cadmium ions contained within said product solution and displaced by said zinc metal and precipitate out of said product solution as lead and cadmium metals and said dispersant is selected from the group consisting of dispersants which will prevent the aggregation of said zinc metal;
AMENDED SHEET (,*«« *
e. separating said product solution from the lead and cadmium metals; f. lowering the temperature of said product solution in a controlled fashion over a predetermined period of time to a temperature of between about 20°C and 60°C thereby precipitating out said compounds of zinc, including diamino zinc dichloride and hydrated zinc oxide; g. separating said precipitated zinc compounds from said product solution; h. washing said zinc compounds with a wash water at a temperature of between about 25°C and 100°C thereby solubilizing the diamino zinc chloride component; i. separating the remaining zinc compound solids from said product solution; and j . drying said remaining zinc compound solids at a temperature of between about
100°C and 200°C resulting in zinc oxide of 99% or greater purity.
27. The method as described in Claim 26, wherein said zinc metal is in powdered form.
28. The method as described in Claim 26, further comprising the step of recycling said product solution after said zinc compounds are precipitated therefrom in step d to be employed in step b.
29. The method as described in Claim 26, further comprising the step of recycling said wash water after said zinc oxide is separated therefrom to be employed in step h.
30. The method as described in Claim 26, further comprising the step of adding a dispersant to said product solution concurrently while adding zinc metal to said product solution in step d.
31. A continuous method for the recovery of zinc oxide from waste materials which comprise compounds of zinc, iron, lead and cadmium, comprising the steps of:
AMENDED SHEET (WπCLE ~>
a. treating said waste materials a first time with an ammonium chloride solution maintained at a temperature of at least 90°C to form a first product solution which comprises dissolved compounds of zinc, lead and cadmium whereby any iron oxide in said waste materials will not go into solution; b. separating said first product solution from the undissolved compounds of iron and any other undissolved waste materials present in said first product solution including any of said iron oxide; c. roasting said undissolved waste materials at a temperature of at least 500°C and in a reducing atmosphere; d. treating said roasted undissolved waste materials a second time with said ammonium chloride solution maintained at a temperature of at least 90°C to form a second product solution which comprises dissolved compounds of zinc, lead and cadmium whereby any iron oxide remaining in said roasted undissolved waste materials will not go into solution; e. combining said first and second product solutions to form a combined product solution and adding zinc metal and a dispersant to said combined product solution whereby the lead and cadmium ions contained within said combined product solution are displaced by said zinc metal and precipitate out of said combined product solution as lead and cadmium metals and said dispersant is selected from the group consisting of dispersants which will prevent the aggregation of said zinc metal; f. separating said combined product solution from the lead and cadmium metals; g. lowering the temperature of said combined product solution in a controlled fashion over a predetermined period of time to a temperature of between about 20°C and 60°C thereby precipitating out said compounds of zinc, including diamino zinc dichloride and hydrated zinc oxide; h. separating said precipitated zinc compounds from said combined product solution;
i. washing said zinc compounds with a wash water at a temperature of between about 25°C and 100°C thereby solubilizing the diamino zinc chloride component;
. j. separating the remaining zinc compound solids from said combined product solution; and k. drying said remaining zinc compound solids at a temperature of between about
100°C and 200°C resulting in zinc oxide of 99% or greater purity.
32. The method as described in Claim 31 , wherein said zinc metal is in powdered form.
33. The method as described in Claim 31, further comprising the step of recycling said combined product solution after said zinc compounds are precipitated therefrom in step e to be employed in steps a and d.
34. The method as described in Claim 31, further comprising the step of recycling said wash water after said zinc oxide is separated therefrom to be employed in step i.
35. The method as described in Claim 31 , further comprising the step of adding a dispersant to said combined product solution concurrently while adding zinc metal to said combined product solution in step e.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU48535/93A AU4853593A (en) | 1992-09-29 | 1993-09-07 | Method for the enhanced recovery of zinc oxide |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US95364592A | 1992-09-29 | 1992-09-29 | |
| US07/953,645 | 1992-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994008057A1 WO1994008057A1 (en) | 1994-04-14 |
| WO1994008057B1 true WO1994008057B1 (en) | 1994-04-28 |
Family
ID=25494314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1993/008497 WO1994008057A1 (en) | 1992-09-29 | 1993-09-07 | Method for the enhanced recovery of zinc oxide |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU4853593A (en) |
| WO (1) | WO1994008057A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368571C (en) * | 2005-11-23 | 2008-02-13 | 中南大学 | Method for separating Fe-Mn and Mn-Zn |
| AU2013220926B2 (en) * | 2012-02-15 | 2016-10-06 | Steel Dynamics Investments, LLC | Process for zinc oxide production from ore |
| BE1031460A1 (en) * | 2023-03-22 | 2024-10-15 | Belzinc | ZINC RECOVERY PROCESS |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3849121A (en) * | 1971-11-30 | 1974-11-19 | W Burrows | Zinc oxide recovery process |
| JPH0692623B2 (en) * | 1989-11-16 | 1994-11-16 | 工業技術院長 | Metal melting method |
| GB2250189B (en) * | 1990-11-28 | 1993-11-24 | Nesbit Evans & Co Ltd | Beds |
-
1993
- 1993-09-07 WO PCT/US1993/008497 patent/WO1994008057A1/en active Application Filing
- 1993-09-07 AU AU48535/93A patent/AU4853593A/en not_active Abandoned
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