NO844047L - PROCEDURE FOR DECLARATION OF ZINC MATERIAL - Google Patents
PROCEDURE FOR DECLARATION OF ZINC MATERIALInfo
- Publication number
- NO844047L NO844047L NO844047A NO844047A NO844047L NO 844047 L NO844047 L NO 844047L NO 844047 A NO844047 A NO 844047A NO 844047 A NO844047 A NO 844047A NO 844047 L NO844047 L NO 844047L
- Authority
- NO
- Norway
- Prior art keywords
- zinc
- reactor
- gas
- fact
- zinc chloride
- Prior art date
Links
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 33
- 229910052725 zinc Inorganic materials 0.000 title claims description 33
- 239000011701 zinc Substances 0.000 title claims description 33
- 238000000034 method Methods 0.000 title claims description 15
- 239000000463 material Substances 0.000 title description 3
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 32
- 239000002994 raw material Substances 0.000 claims description 19
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 18
- 239000011592 zinc chloride Substances 0.000 claims description 16
- 235000005074 zinc chloride Nutrition 0.000 claims description 16
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 13
- 229910052801 chlorine Inorganic materials 0.000 claims description 13
- 239000000460 chlorine Substances 0.000 claims description 13
- 239000011787 zinc oxide Substances 0.000 claims description 9
- 238000006298 dechlorination reaction Methods 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 238000010979 pH adjustment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 claims description 3
- 238000009331 sowing Methods 0.000 claims 8
- 238000010186 staining Methods 0.000 claims 1
- 150000003751 zinc Chemical class 0.000 claims 1
- 239000000047 product Substances 0.000 description 8
- 239000002699 waste material Substances 0.000 description 5
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- -1 scrap Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- 239000004484 Briquette Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
- C01G9/03—Processes of production using dry methods, e.g. vapour phase processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
Avklorering av zinkråvaraDechlorination of zinc raw material
Foreliggande uppfinning hånfor sig till ett satt for avklorering och oxidering av sekundåra zinkråvaror i form av dross, askor, oxider eller andra biprodukter. The present invention relates to a set for dechlorination and oxidation of secondary zinc raw materials in the form of dross, ascor, oxides or other by-products.
Bara i Europa raknar man med att det finns mellan 40.000 och 60.000 ton zinkaska, forutom al.lt ovrigt zinkhaltigt avfall. Zinkaskan produceras som avfallsprodukt i samband med zinktillverkning och innehåller ca 60 % zink som me-tall och oxid. En stor nackdel nar det gåiler existerande processer ar att zinkaskan innehåller hoga halter av klor i form av låttflyktig zinkklorid och andra klorider. In Europe alone, it is estimated that there are between 40,000 and 60,000 tonnes of zinc ash, apart from all other zinc-containing waste. Zinc ash is produced as a waste product in connection with zinc production and contains approx. 60% zinc as metal and oxide. A major disadvantage when using existing processes is that the zinc ash contains high levels of chlorine in the form of volatile zinc chloride and other chlorides.
Zinkaskan har ett stort varde som zinkråvara, framfor allt for sekundårindustrin,- men endast under forutsattning att den kan befrias helt från klor, eftersom klor år ett gift. Idag underkastas zinkaskan huvudsakligen en termisk behandling i roterugn for eliminering av flyktiga klorfo-reningar. Den avklorerade produkten går sedan till till-verkning av zinkoxid for anvåndning som pigment eller for framstållning av filler. Zinc ash has great value as a zinc raw material, above all for the secondary industry - but only on the condition that it can be completely freed from chlorine, since chlorine is a poison. Today, the zinc ash is mainly subjected to a thermal treatment in a rotary kiln to eliminate volatile chlorine compounds. The dechlorinated product then goes to the production of zinc oxide for use as a pigment or for the production of fillers.
Ovannåmnda kånda process har emellertid begrånsningar som påverkar mojligheterna att utvinna zinkaskans vårdefulla beståndsdelar med något hogre utbyte. Verkningsgraden i roterugn år mycket låg, och roterugnarna år vidare svåra att få tåta och. dårfor ur miljosynpunkt otillfredsstallan-de. Processer i roterugnår ger vidare upphov till mycket stora gasmångder fråmst beroende på att vårmen ska gene-reras genom forbrånning.• However, the above-mentioned process has limitations that affect the possibilities of extracting the zinc ash's valuable constituents with a somewhat higher yield. The efficiency of rotary kilns is very low, and the rotary kilns are also difficult to fill. therefore, from an environmental point of view, they are unsatisfactory. Processes in rotary kilns also give rise to very large quantities of gas, mainly due to the heat being generated through combustion.•
Andamålet med foreliggande uppfinning år dårfor att åstad-komma en process som mojliggor långtgående utvinning av vårdefulla beståndsdelar i klorhaltig zinkråvara och i vilken nackdelarna som år forknippade med de kånda proces-serna elimineras eller minimeras. The aim of the present invention is therefore to create a process which enables far-reaching extraction of valuable components in chlorine-containing zinc raw material and in which the disadvantages associated with the known processes are eliminated or minimized.
Detta uppnås med såttet enligt foreliggande uppfinning huvudsakligen dårigenom att den klorhaltiga zinkråvaran inmatas i en reaktor och upphettas till ca 750°C, varvid den erforderliga vårmeenergin tillfores medelst en i en plasmagenerator upphettad, energirik gas och att gasformig zinkklorid avdrages vid reaktorns topp och avklorerad zinkoxid avdrages vid en lågr.e nivå i reaktorn. Den energirika gasen bor foretrådesvis vara oxiderande for att oxi-dera upp eventuell zinkmetall till zinkoxid och dårmed forhindra kladdning. This is achieved with the seed according to the present invention mainly by feeding the chlorine-containing zinc raw material into a reactor and heating it to about 750°C, whereby the required thermal energy is supplied by means of an energy-rich gas heated in a plasma generator and gaseous zinc chloride is removed at the top of the reactor and dechlorinated zinc oxide is removed at a low level in the reactor. The energy-rich gas should preferably be oxidizing in order to oxidize any zinc metal to zinc oxide and thereby prevent fouling.
Enligt en forstå utforingsform av uppfinningen tillfores den klorhaltiga zinkråvaran i pulverform ovanfor en gasgenomslåpplig rost, under vilken tillfores en medelst en plasmagenerator upphettad gas, vars mångd och hastig-het år så avpassad, att en fluidiserad bådd uppråtthålles ovanfor nåmnda rost, samtidigt som den i plasmageneratorn tillforda energimångden avpassas så att en temperatur på ca 750°C uppråtthålles i reaktorns ovre del, varvid en avklorerad av zinkoxid bestående produkt avdrages genom ett bråddavlopp och gasforraig zinkklorid avdrages genom ett gasutlopp i reaktorns topp. According to an understood embodiment of the invention, the chlorine-containing zinc raw material is supplied in powder form above a gas-permeable grate, under which a gas heated by means of a plasma generator is supplied, the quantity and speed of which are so adjusted that a fluidized bath is maintained above the said grate, at the same time that in the amount of energy supplied by the plasma generator is adjusted so that a temperature of approx. 750°C is maintained in the upper part of the reactor, whereby a dechlorination product consisting of zinc oxide is removed through an emergency outlet and gas source zinc chloride is removed through a gas outlet at the top of the reactor.
Enligt en andra utforingsform av uppfinningen tillfores den klorhaltiga råvaran i briketterad form eller stycke-form genom ett gastått uppsåttningsmål i reaktorns topp samt avdrages avklorerad zinkoxidprodukt vid reaktorns botten genom en gaståt utmatningsanordning, varvid av-drivningen av bildad gasformig zinkklorid sker genom att varmeenergi tillfores medelst en i en plasmagenerator upphettad gas i en sådan mångd att temperaturen i reaktorns topp uppråtthålles vid ca 750°C. According to a second embodiment of the invention, the chlorine-containing raw material is supplied in briquette form or piece form through a gas-tight installation target at the top of the reactor, and dechlorinated zinc oxide product is removed at the bottom of the reactor through a gas-tight discharge device, whereby the removal of formed gaseous zinc chloride takes place by supplying heat energy through a gas heated in a plasma generator in such a quantity that the temperature at the top of the reactor is maintained at approximately 750°C.
Ytterligare fordelar och kånnetecken hos uppfinningen kom-mer att framgå av nedanstående detaljerade beskrivning av två utforingsformer av uppfinningen i anslutning till bi-fogade ritningar, på vilka Further advantages and features of the invention will be apparent from the following detailed description of two embodiments of the invention in connection with the attached drawings, on which
fig 1 visar ett schematiskt flodesschema avseende avklorering och oxidering av sekundara zinkråvaror i pulverform, och fig 1 shows a schematic flow chart regarding the dechlorination and oxidation of secondary zinc raw materials in powder form, and
fig 2 visar ett schematiskt flodesschema avseende avklorering och oxidering av sekundara zinkråvaror i briketterad form. fig 2 shows a schematic flow diagram regarding the dechlorination and oxidation of secondary zinc raw materials in briquetted form.
Zinkråvaran kan, såsom nåmnts i beskrivningens inledning, hårstamma från zinkframstållning och utgors då av zinkaska. Emellertid produceras åven sekundårt zinkhaltigt avfall i form av kemikalier, skrot, plaster etc. Beroende på avfallstyp kan efter onskemål materialet tillforas i finfordelad form, varvid en reaktor som arbetar enligt principen for en fluidiserad badd, jåmfor fig 1, utnyttjas, eller kan materialet briketteras och matas in i en såsom schaktugn arbetande reaktor, jåmfor processen enligt fig 2. The zinc raw material can, as mentioned in the introduction to the description, originate from zinc smelting and then consist of zinc ash. However, secondary zinc-containing waste is also produced in the form of chemicals, scrap, plastic, etc. Depending on the type of waste, the material can be supplied in finely divided form, whereby a reactor that works according to the principle of a fluidized bath, as shown in Fig. 1, is used, or the material can be briquetted and fed into a reactor operating as a shaft furnace, according to the process according to fig 2.
Vid processen enligt fig 1 utnyttjas en reaktor 1 med fluidiserad bådd. Den klorhaltiga zinkråvaran matas in genom ett inlopp 2 ovanfor en gasgenomslåpplig botten eller rost 3 i finfordelad form, dvs zinkråvaran skall vara krossad till korn vars storlek inte bor overstiga ca 5 mm. Kornen skall emellertid vara tillråckligt stora for att inte med-ryckas av fluidiseringsgasen, och vidare bor storleken vara avpassad så att erforderlig uppehållstid erhålles i reaktorn medelst den upphettade fluidiseringsgasen, som bi-bringas ett onskat hogt energiinnehåll i en plasmagenerator 4 och dårefter blåses in under overtryck i reaktorn 1 under nåmnda rost. In the process according to Fig. 1, a reactor 1 with a fluidized bed is used. The chlorine-containing zinc raw material is fed in through an inlet 2 above a gas-permeable bottom or grate 3 in finely divided form, i.e. the zinc raw material must be crushed into grains whose size should not exceed approx. 5 mm. However, the grains must be sufficiently large so as not to be carried away by the fluidizing gas, and furthermore the size must be adjusted so that the required residence time is obtained in the reactor by means of the heated fluidizing gas, which is given a desired high energy content in a plasma generator 4 and then blown in under overpressure in reactor 1 under the above-mentioned rust.
Avklorerad produkt i form av zinkoxid avdrages dårefter genom ett braddavlopp 5, under det att bildad gasformig zinkklorid uttages genom ett gasutlopp 6 vid reaktorns topp 7. The dechlorinated product in the form of zinc oxide is then removed through a brad outlet 5, while the gaseous zinc chloride formed is removed through a gas outlet 6 at the top 7 of the reactor.
Den gasformiga zinkkloriden går sedan vidare genom en stoftficka 8 for att dårefter omsåttas med vatten i en venturiskrubber 9. Hårvid erhålles genom pH-justering i en behållare 10 av den erhållna zinkkloridlosningen sink-dihydroxid. Den renade processgasen kan dårefter recirku-lera till processen alternativt slåppas ut i atmosfåren. The gaseous zinc chloride then passes through a dust pocket 8 to then react with water in a venturi scrubber 9. Hair width is obtained by pH adjustment in a container 10 of the obtained zinc chloride zinc-dihydroxide solution. The purified process gas can then be recirculated to the process or alternatively discharged into the atmosphere.
Det i stoftfickan 8 avskilda stoftet, som i huvudsak be-står av zinkoxid, tillvaratages tillsammans med den avklorerade zinkoxidprodukten. The dust separated in the dust pocket 8, which mainly consists of zinc oxide, is disposed of together with the dechlorinated zinc oxide product.
Den anvånda gasen skall vara oxiderande och kan exempelvis utgoras av luft. The gas used must be oxidizing and can, for example, be made up of air.
Temperaturen i den fluidiserande båddens ovre del 11 skall foretrådesvis ligga på ca 750°C. Temperaturen i venturiskrubbern ligger på ungefår rumstemperatur. Den avklorerade zinkoxidprodukten, vilken avdrages genom bråddavloppet 5, matas ut genom en gaståt slussanordning 12 av i och for sig kånt slag. The temperature in the upper part 11 of the fluidizing vessel should preferably be around 750°C. The temperature in the venturi scrubber is approximately room temperature. The dechlorinated zinc oxide product, which is carried off through the emergency drain 5, is fed out through a gas-tight sluice device 12 of a suitable type.
Vid den i fig 2 illustrerade processen tillfores briketterad eller styckeformig .klorhaltig zinkråvara 21 i toppen av en reaktor 22 genom ettkonventionellt gastått uppsåttningsmål 23. Reaktorn fungerar som en schaktugn, dår det briketterade utgångsmaterialet bildar en fyllning 24, som kontinuerligt sjunker ned genom reaktorn. Den erforderliga energin tillfores, såsom vid foregående process medelst en i en plasmagenerator 25 upphettad gas, varvid energitill-forseln regleras så att en temperatur på ca 750°C upprått hålles vid reaktorns topp 26. Gasformig zinkklorid avdrages genom ett gasutlopp 27 vid reaktorns topp under det att avklorerad zinkoxid matas ut vid reaktorns hot-ten 28 genom en gaståt slussanordning 29. In the process illustrated in Fig. 2, briquetted or lumpy chlorine-containing zinc raw material 21 is fed into the top of a reactor 22 through a conventional gas-fired installation target 23. The reactor functions as a shaft furnace, as the briquetted starting material forms a filling 24, which continuously sinks down through the reactor. The required energy is supplied, as in the preceding process, by means of a gas heated in a plasma generator 25, whereby the energy supply is regulated so that a temperature of approximately 750°C is maintained at the top of the reactor 26. Gaseous zinc chloride is withdrawn through a gas outlet 27 at the top of the reactor under that dechlorinated zinc oxide is fed out at the reactor hotplate 28 through a gas-tight sluice device 29.
I detta senare fall dår briketterat utgångsmaterial ut-nytt jas, erfordras icke något stoftfilter, då den even-tuella mycket ringa mångd stoft som kan ryckas med av gasen utan problem kan fångas upp i venturiskrubbern 30, In this latter case, when briquetted starting material is reused, no dust filter is required, as the possible very small amount of dust that can be carried away by the gas can be caught in the venturi scrubber 30 without problem,
i vilken i gasen innehållen zinkklorid upptas i form av en vattenlosning, som genom en pH-justering i en behållare 31 kan overforas till zinkhydroxid. Vid nåmnda uttvått-ning uppgår temperaturen till cirka 30°. in which the zinc chloride contained in the gas is taken up in the form of an aqueous solution, which can be converted to zinc hydroxide through a pH adjustment in a container 31. In the case of the aforementioned wetting, the temperature rises to approximately 30°.
Den erhållna avgasen kan slåppas ut i atmosfåren alternativt komprimeras och recirkuleras i processen. The resulting exhaust gas can be released into the atmosphere or alternatively compressed and recirculated in the process.
Genom de båda ovannåmnda utforingsformerna av processen enligt uppfinningen kan således vårdefull zink och zinkoxid utvinnas vid alla tånkbara avfallsprodukter från industrin, vilka med dagens teknik inte kan utvinnas på ekonomiskt sått. Through the two above-mentioned embodiments of the process according to the invention, valuable zinc and zinc oxide can thus be extracted from all conceivable waste products from industry, which with current technology cannot be economically extracted.
Claims (13)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8306804A SE8306804L (en) | 1983-12-09 | 1983-12-09 | DECLARATION OF ZINC PRODUCTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO844047L true NO844047L (en) | 1985-06-10 |
Family
ID=20353661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO844047A NO844047L (en) | 1983-12-09 | 1984-10-09 | PROCEDURE FOR DECLARATION OF ZINC MATERIAL |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS60125337A (en) |
| AU (1) | AU3283084A (en) |
| BE (1) | BE900757A (en) |
| DE (1) | DE3431381A1 (en) |
| DK (1) | DK390284A (en) |
| ES (1) | ES8506357A1 (en) |
| FR (1) | FR2556368A1 (en) |
| GB (1) | GB2150923A (en) |
| IT (1) | IT1176628B (en) |
| NO (1) | NO844047L (en) |
| SE (1) | SE8306804L (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8518746D0 (en) * | 1985-07-24 | 1985-08-29 | Fray D J | Zinc recovery |
| JPH04125328U (en) * | 1991-05-07 | 1992-11-16 | 株式会社タイセイ | water related floor coverings |
| SE9400533L (en) * | 1994-02-15 | 1995-08-16 | Odda Recycling As | Ways to remove halogens from a material |
| CN1057131C (en) * | 1996-05-28 | 2000-10-04 | L及C斯泰因米勒(非洲)(私人)有限公司 | Fluidized bed treatment of EAF dust |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE350702C (en) * | 1921-04-14 | 1922-03-24 | Oberschlesische Zinkhuetten Ak | Process for processing zinc ashes or oxides containing chlorine zinc |
| US1605640A (en) * | 1923-06-28 | 1926-11-02 | American Smelting Refining | Recovery of zinc as sulphate from dross |
| GB269321A (en) * | 1926-04-07 | 1927-04-21 | American Smelting Refining | Improvements in or relating to the recovery of zinc from the dross obtained in melting zinc during refining |
| GB279693A (en) * | 1927-02-28 | 1927-11-03 | Metallbank & Metallurg Ges Ag | Method of and apparatus for sintering, desulphurising or removing volatile constituents from ores and metallurgical products |
| US1851130A (en) * | 1929-01-29 | 1932-03-29 | Federated Metals | Process of treating zinc skimmings |
| GB696003A (en) * | 1951-06-13 | 1953-08-19 | Basf Ag | Improvements in the chlorinating roasting of materials containing copper or zinc or both |
| DE877957C (en) * | 1951-07-26 | 1953-08-10 | Metallgesellschaft Ag | Process for blowing zinc-containing material |
| US2936233A (en) * | 1957-12-16 | 1960-05-10 | Horizons Inc | Zinc recovery |
| US3425797A (en) * | 1966-02-25 | 1969-02-04 | Aluminium Lab Ltd | Recovery of purified divalent metal chlorides |
| US4257914A (en) * | 1979-12-10 | 1981-03-24 | Conoco, Inc. | Method for the regeneration of spent molten zinc chloride |
-
1983
- 1983-12-09 SE SE8306804A patent/SE8306804L/en not_active Application Discontinuation
-
1984
- 1984-08-14 DK DK390284A patent/DK390284A/en unknown
- 1984-08-20 JP JP59171697A patent/JPS60125337A/en active Pending
- 1984-08-23 FR FR8413120A patent/FR2556368A1/en not_active Withdrawn
- 1984-08-24 IT IT2240984A patent/IT1176628B/en active
- 1984-08-25 DE DE19843431381 patent/DE3431381A1/en not_active Ceased
- 1984-09-03 GB GB8422211A patent/GB2150923A/en not_active Withdrawn
- 1984-09-07 AU AU32830/84A patent/AU3283084A/en not_active Abandoned
- 1984-09-12 ES ES535856A patent/ES8506357A1/en not_active Expired
- 1984-10-05 BE BE0/213781A patent/BE900757A/en not_active IP Right Cessation
- 1984-10-09 NO NO844047A patent/NO844047L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK390284D0 (en) | 1984-08-14 |
| SE8306804L (en) | 1985-06-10 |
| JPS60125337A (en) | 1985-07-04 |
| BE900757A (en) | 1985-02-01 |
| SE8306804D0 (en) | 1983-12-09 |
| ES535856A0 (en) | 1985-07-16 |
| GB8422211D0 (en) | 1984-10-10 |
| GB2150923A (en) | 1985-07-10 |
| FR2556368A1 (en) | 1985-06-14 |
| IT1176628B (en) | 1987-08-18 |
| DE3431381A1 (en) | 1985-06-20 |
| AU3283084A (en) | 1985-06-13 |
| DK390284A (en) | 1985-06-10 |
| ES8506357A1 (en) | 1985-07-16 |
| IT8422409A0 (en) | 1984-08-24 |
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