SE201780C1

SE201780C1 -

Info

Publication number: SE201780C1
Authority: SE
Publication date: 1965-01-01

Description

KLASS INTERNATIONELLSVENSK C22 ba:7/04 PATENT- OCH REGISTRERINGSVERKET Ans. 6856/1961 inkom den 30/6 1961 uttagd den 10/5 196 METALLURGICAL DEVELOPMENT Co., NASSAU, BAHAMAIDARNA Forfarande for behandling av slagg tippfinnare: P M J Gray Prioritet begard frdn den 6 juli 1960 och 8 juni 1961 (Storbritannien) Foreliggande uppfinning hanfor sig till ett forfarande for behandling av sadan arsenikhaltig slagg, som erhalles vid reduktion av zink- och blymalm i masugn. Uppfinningen hanfOr sig flax-mare bestamt till behandling av arsenikslaggar innehallande kloridflusser, sá att de kunna hanteras riskfritt utan utveckling av arsenikvate. CLASS INTERNATIONAL SWEDISH C22 ba: 7/04 PATENT AND REGISTRATION AGENCY Ans. 6856/1961 was received on 30/6 1961 taken on 10/5 196 METALLURGICAL DEVELOPMENT Co., NASSAU, BAHAMAIDARNA Procedure for treatment of slag tipper: PMJ Gray Priority requested from 6 July 1960 and 8 June 1961 (Great Britain) The present invention applies to to a process for treating such arsenic-containing slag, which is obtained by reducing zinc and lead ore in a blast furnace. The invention is more particularly intended for the treatment of arsenic slag containing chloride fluxes, so that they can be handled without risk without the development of arsenic water.

Slagger innehallande kloridflusser, exempelvis slagger frail flussbadet, ha hog halt arsenik och avge arsin vid kontakt med vatten i kyla. Eftersom slaggen är sonderflytande, är den darfOr alltfor farlig att hantera och aterfora till sintringsanlaggningen, aven om detta skulle vara Onskvart ur ekonomisk synpunkt. Det Or darfOr nodvandigt att overfOra den arsenikhaltiga slaggen till giftfri form. Slags containing chloride fluxes, for example slag frail flux bath, have high arsenic content and release arsine on contact with water in cold. Because the slag is liquid, it is therefore too dangerous to handle and return to the sintering plant, even if this would be Unskvart from an economic point of view. It is necessary to transfer the arsenic-containing slag to a non-toxic form.

Foreliggande uppfinning, vars kannetecken framgä av efterfoljande patentansprak, avser ett forfarande for behandling av arsenikhaltig slagg bestdende i lakning av slaggen i ett bad av smalt bly, lampligen vid 600-650° C och lampligen under 10-15 min. Uppfinningen kan emellertid awil ehuru i vissa hanseenden mindre effektivt genomf bras med en blytemperatur av 500-650° C och en lakningstid av 5-30 min. The present invention, the characteristics of which appear from the appended patent claims, relates to a process for treating arsenic-containing slag consisting in leaching the slag in a bath of narrow lead, suitably at 600-650 ° C and suitably for 10-15 minutes. However, the invention can be carried out less efficiently in some male respects with a lead temperature of 500-650 ° C and a leaching time of 5-30 minutes.

Upp till 50 % av arseniken gar fOrlorad under behandlingen huvudsakligen genom forangning ehuru liven genom losning i blyet. Up to 50% of the arsenic is lost during the treatment mainly by evaporation although the life by dissolving in the lead.

Ehuru slagg behandlad enligt ovan ger mycket litet arsin vid statisk kontakt med vatten, kan den fortfarande utveckla en del arsin, da den far sta langre tid och stOres. Den genom blylakningen erhallna slaggen konditioneras darfor genom blandning med 6-10 % vatten under 45- Uppfinningen kan d.ven ehuru i vissa hanseende mindre fordelaktigt genomforas om slaggen konditioneras med 2-10 % vatten under 20-60 min. Although slag treated as above produces very little arsine upon static contact with water, it can still develop some arsine, as it lasts longer and is stored. The slag obtained by the lead leaching is therefore conditioned by mixing with 6-10% of water for 45 minutes.

Det Or icke klarlagt, varf Or denna lakning gOr slaggen saker mot utveckling av arsin med vatten, ehuru man kan tanka sig, att den obehandlade flussbadslaggen, som innehdller zinkarsenid, zinkklorid och metallisk zink, bildar en sur losning med vatten, som reagerar med arseniden under bildning av arsin. Zinkarseniden reagerar icke i neutral losning och efterbehandlingen i franvaro av metallisk zink, som liar lakats ut med det smdlta blyet, medfor icke bildning av nagon sur lOsning. It is not clear why this leaching causes the slag to develop against arsine with water, although it is conceivable that the untreated flux bath slag, which contains zinc arsenide, zinc chloride and metallic zinc, forms an acidic solution with water which reacts with the arsenide. during the formation of arsine. The zinc arsenide does not react in neutral solution and the post-treatment in the absence of metallic zinc, which has been leached with the molten lead, does not result in the formation of any acidic solution.

Den meta% som har losts ut ur slaggen, kan sedan utvinnas ur blyet. The meta% that has been released from the slag can then be extracted from the lead.

Bildningen av arsin vid blandning med vatten kan minskas ytterligare, om den arsenikhaltiga flusslaggen blandas med nngefar samma mangd arsenikfri slagg, som kan utgaras av en utifran tillford zinkslagg. Blandningen kan genomforas fore blylalmingen eller under tillsats av omvaxlande arsenikhaltig och arsenikfri slagg till blylakningsbadet. The formation of arsine when mixed with water can be further reduced if the arsenic-containing flux slag is mixed with approximately the same amount of arsenic-free slag, which can be extracted from an external zinc slag. The mixing can be carried out before the lead grinding or with the addition of alternating arsenic-containing and arsenic-free slag to the lead leaching bath.

Uppfinningen kommer i det foljande all belysas ndrmare genom ett icke begransande exempel. The invention will be further elucidated in the following by a non-limiting example.

Exempel. Ungefar lika viktdelar flussbadslagg och utifran tillford zinkslagg blandades i en slagglada (de exakta proportionerna Oro icke kritiska). Example. Approximately equal parts by weight of flux bath slag and externally supplied zinc slag were mixed in a slag slag (the exact proportions are not critical).

C:a 45-68 kg av denna slagg Males pd. ytan av en blysmdlta vid 600-650° C i en tank med diametern c:a 75 cm innehallande 2 t bly och forsedd med en omrorare pa. c:a 20 cm. Badet omrordes sedan 10-15 min. About 45-68 kg of this slag Males pd. the surface of a lead melt at 600-650 ° C in a tank with a diameter of about 75 cm containing 2 t of lead and equipped with a stirrer on. c: a 20 cm. The bath was then stirred for 10-15 minutes.

Halften av den behandlade slaggen avldgsnades genom rakning uppf Or en ramp till en torn slagglada, medan ytterligare 45-68 kg slagg tillsattes och omrordes 10-15 min. Detta upprepades, tills all slagg hade behandlats. Half of the treated slag was removed by shaving up a ramp to a tower slag-laden, while another 45-68 kg of slag was added and stirred for 10-15 minutes. This was repeated until all the slag had been treated.

En tredjedel av blyet pumpades sedan till en kylskank och ersattes med liknande mangd kylt 2 bly. Medan blyet i skanken svalnade, skummades zink och aterfordes till kondensorpumpens sump. One third of the lead was then pumped to a cooling shank and replaced with a similar amount of cooled 2 lead. While the lead in the shank cooled, zinc was foamed and returned to the condenser pump sump.

Udall med den torra, behandlade slaggen fick svalna i luften, tills rOkbildningen upphorde, och tomdes pa ett galler. Slaggen konditionerades sedan. Udall with the dry, treated slag was allowed to cool in the air, until the smoke formation ceased, and was emptied on a grate. The slag was then conditioned.

I gallrets underkorgficka sammanfordes den behandlade slaggen med c:a 227 kg/h annan slagg, exempelvis frammande oxidslagg. De bagge slaggerna grovblandades endast. In the lower basket pocket of the grid, the treated slag was combined with about 227 kg / h of other slag, for example foreign oxide slag. The ram slag was coarsely mixed only.

Slaggerna matades i satser pa 204 kg till tva parallellkopplade propellerblandare och konditionerades 45-50 min med c:a 6 % vatten i tillracklig mangd for aft forhindra dammning. Blandaren genomspolades med 2,8 m3/min lull. Slaggen lagrades sedan. The slag was fed in batches of 204 kg to two parallel-connected propeller mixers and conditioned for 45-50 minutes with about 6% water in a sufficient amount to prevent dusting. The mixer was flushed through with 2.8 m3 / min lull. The slag was then stored.

Det är nodvandigt att ventilera blandare, galler, trumma och lagringsfickor for konditionerad slagg. Ftiljande resultat erhollos: Ingdende Flussbadslagg Hallbadsslagg Torr- vikt kg 113,4 113,4 Zink kg 46, 86,7 fly kg 30,7 7,2 Klorid Arse- kgnik kg 13,1,8 -0, 226,8 133,2 37,9 13,2,3 Pro dukt Slagg 167,1 90,3 34,8,1,0 Metall 61,7 61,1 0,6 - - 228,8 151,4 35,1 8,1,0 Arsinhalten i avluften vid slutet av blandningssteget var 6 milliondelar och den totala utvecklingen av arsin under blandningen var 92 milliondelar. It is necessary to ventilate mixers, grilles, drums and storage pockets for conditioned slag. Additional results obtained: Ingdende Flussbadslagg Hallbadsslagg Dry weight kg 113.4 113.4 Zinc kg 46, 86.7 fly kg 30.7 7.2 Chloride Ars- kgnik kg 13,1,8 -0, 226,8 133, 2 37.9 13.2.3 Product Slag 167.1 90.3 34.8.1.0 Metal 61.7 61.1 0.6 - - 228.8 151.4 35.1 8.1, The arsine content in the exhaust air at the end of the mixing step was 6 million parts and the total evolution of arsine during the mixing was 92 million parts.

Olika modifikationer kunna vidtas Mom uppfinningens ram. Various modifications may be made to the scope of the invention.

Claims

Patent claims:

Process for the treatment of slag containing metallic zinc and arsenic and zinc and arsenic compounds, including chlorides and oxides, so that the slag is substantially free of evolution of arsine on contact with water, characterized in that the slag is leached with a bath of small lead at a temperature of 500-650 ° C for a period of between 5 and 30 minutes saint that the leached slag is conditioned by mixing with 2-10% water.

Process according to claim 1, characterized in that the leaching is carried out at 600-650 ° C.

Method according to claim 1 or 2, characterized in that the leaching is carried out for 10-15 minutes.

4. A method according to any one of claims 1-3, characterized in that the leached slag is mixed with 6-10% water.

Process according to claim 4, 1. Characterized by the slag being stirred with water for 20-60 minutes.

Method according to claim 5, characterized in that the slag is morassed with water for 45-50 minutes.

7. A method according to any one of claims 1-6, characterized in that the leached slag is mixed with arsenic-free, zinc-containing slag, before the water is added.

8. A method according to claim 7, characterized in that the arsenic-free slag is mixed with the arsenic-containing slag before lead leaching.

9. A method according to claim 7, characterized in that the arsenic-free slag is added to the lead leaching bath alternating with batches of the arsenic-containing slag.

10. A method according to any one of the preceding patent languages, characterized in that leached metal is then extracted from the slag from the lead.

11. A method according to claim 1, characterized in that it is applied to arsenic-containing slag obtained in the operation of a zinc blasting furnace and that the leached slag is returned to the charge for the zinc blasting furnace. Request publications: Patent Papers from Great Britain 6670 ar 19 10.