Method of obtaining electrolytic manganese from ferroalloy production waste
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C25C-001/10
B01D-053/73
출원번호
US-0580855
(2004-05-25)
등록번호
US-8911611
(2014-12-16)
국제출원번호
PCT/ES2004/000239
(2004-05-25)
§371/§102 date
20060526
(20060526)
국제공개번호
WO2005/115593
(2005-12-08)
발명자
/ 주소
Sanchez Recio, Juan Carlos
Sancho Martinez, José
출원인 / 주소
Ferroatlantica, S.L.
대리인 / 주소
Ladas & Parry LLP
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
A process for obtaining electrolytic manganese from the treated sludge of the exhaust gases of ferroalloy production furnaces for any other industrial waste having magnesium in general, with a significant manganese content, by means of a process consisting of the following phases: sulphation, lixivi
A process for obtaining electrolytic manganese from the treated sludge of the exhaust gases of ferroalloy production furnaces for any other industrial waste having magnesium in general, with a significant manganese content, by means of a process consisting of the following phases: sulphation, lixiviation, purification, conditioning and electrolysis, and whereby a manganese sulphate liquor is obtained that is suitable for the already known electrolysis process, which allows obtaining electrolytic manganese.
대표청구항▼
1. A method of obtaining electrolytic manganese from treated sludge of exhaust gases from silico- and ferroalloy production furnaces, comprising: a sulfation step wherein the sludge is treated with sulfuric acid within a furnace and heated until dry, in which near-stoichiometric consumption of the a
1. A method of obtaining electrolytic manganese from treated sludge of exhaust gases from silico- and ferroalloy production furnaces, comprising: a sulfation step wherein the sludge is treated with sulfuric acid within a furnace and heated until dry, in which near-stoichiometric consumption of the acid is used;a lixiviation step following the sulfation step, comprising mixing the product of the sulfation step with sulfuric acid to produce a leach solution;a primary purification step following the lixiviation step, comprising the removal of impurities, comprising primarily aluminum and iron, by the adjustment of the pH of the leach solution through the addition of lime so as to cause the precipitation of the impurities as hydroxides wherein the precipitates are removed from the leach solution by filtration to form a primary solution;an organic removal step, comprising passing the primary solution obtained from the primary purification step through an active carbon filter;a secondary purification step, following the organic removal step, comprising a step of removing additional impurities, comprising primarily zinc, by the addition of a sulfur containing compound under slightly acidic conditions causing the additional impurities to precipitate out as sulfides so as to form a secondary solution;a conditioning step, comprising steps of: (a) increasing the pH of the secondary solution; followed by (b) a crystallization step wherein the secondary solution having the increased pH is treated in a crystallizer under conditions to favor the precipitation of calcium and magnesium as ammonium salts; and concluding withan electrolysis step, wherein the electrolysis step results in a manganese purity of 99.9%. 2. The method of claim 1, wherein the sulfation step is carried out in a furnace in which exothermic reactions occur inside the furnace and on PTFE trays, generating SO2 gases. 3. The method of claim 1, wherein the lixiviation and primary purification steps are carried out with a consumed anolyte of an electrolysis cell or with a synthetic anolyte. 4. The method of claim 1, wherein in said lixiviation step, an anolyte is used as a lixiviation agent, and wherein said lixiviation step is carried out with strong stirring in a reactor coated with an acid-resistant material. 5. The method of claim 1, wherein the primary purification step is carried out in the same reactor as the lixiviation step, and the pH of the precipitates is raised to values near neutral pH, wherein said filtration comprises filtering the precipitates in a filter press and washing with water to obtain an inert waste. 6. The method of claim 5, wherein the washing water of the precipitates is used as added water to a mixer in an initial step of the process prior to the sulfation step, or the washing water can be re-used successive times to concentrate the manganese therein.
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이 특허에 인용된 특허 (6)
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