Cyanides
Mostrando 1-11 de 11 artigos, teses e dissertações.
-
1. NEW ALTERNATIVE FOR REUSE HAZARDOUS WASTE FROM THE PRIMARY ALUMINUM PRODUCTION PROCESS (SPL): PRODUCTION OF THE OPAL GLASS AND FRITS / Nova alternativa para reaproveitamento do resíduo perigoso gerado na produção de alumínio primário (SPL): obtenção de vidros opacos e fritas.
The solid waste from deteriorated linings of cells in the aluminum metal production is called spent pot lining or SPL. Because of the presence of leachable cyanide and fluoride compounds the SPL is classified by internationals standards and the Brazilian Association of Technical Standard (ABNT) as hazardous waste. The purpose of the present work is to evalua
Publicado em: 2008
-
2. Cytogenotoxicity of SPL "(Spent Pot Liner" by plant root tip bioassays. / Citogenotoxidade do SPL (Spent Pot Liner) por meio de bioensaios vegetais em Ãpice radicular.
SPL (Spent Pot Liner) is a toxic solid waste generated by aluminum industry during the manufacturing of aluminum metal in electrolytic cells. It has a composition highly variable including fluoride salts, cyanides, metals and organic compounds. In Brazil, aluminum industries generate about 35,000 t of SPL per year. Some industries recycle this waste as feeds
Publicado em: 2008
-
3. Estudo da influência de compostos recalcitrantes na remoção de matéria orgânica biodegradável no tratamento de efluente de refinarias de petróleo / Studies of hard-to-degrade compounds influence on removal of biodegradable organic material from petroleum refinery wastewaters
Petroleum Refinery wastewaters (PRW) have hart-to-degrade compounds, such as: phenols, ammonia, cyanides, sulfides, oils and greases and the mono and polynuclear aromatic hydrocarbons: benzene, toluene and xylene (BTX), acenaphthene, nitrobenzene and naphtalene. It is known that the microrganisms activity can be reduced in the presence of certain substances,
Publicado em: 2008
-
4. Trabalho e genero : condições de saude das mulheres no setor de bijuterias e folheados / Labour and gender : health conditions of women the gold platted and fashion jewel industry
The objective of this transversal cut research was to check the health conditions of women working in the gold platted- and fashion jewel manufacture in Limeira, SP, Brazil. To do so, a profile of the subjects was designed taking into account the tasks performed by the workers, their exposure to cyanide and the self-referred complaints of health problems. A
Publicado em: 2008
-
5. The elution of metal cyanocomplexes from polyacrylic - and polystyrene- based ion exchange resins using nitrate and thiocyanate eluants
Ion exchange resins can potentially be applied in cyanide recycling to address growing environmental concerns over the use of cyanide during gold extraction. In the present work the elution of copper-, iron-, and zinc-cyanocomplexes from polyacrylic- and polystyrene-based resins was studied. It was found that iron and copper cyanides are easily eluted from p
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
-
6. TRATAMENTO DE REVESTIMENTOS GASTOS DE CUBA ELETROLÍTICA DA INDÚSTRIA DE ALUMÍNIO / TREATMENT OF SPENT POTLINER FROM ALUMINIUM INDUSTRY
Spent Potliner (SPL) is a residue from the primary aluminium production. It is indicated as the major environmental problem in the aluminum industry. SPL is formed by two fractions: Carbonaceous and refractory. According to Brazilian Standards NBR 10004, the SPL is listed as hazardous waste (K088) because it contains high levels of cyanides (complex). The pr
Publicado em: 2007
-
7. A statistical approach to the experimental design of the sulfuric acid leaching of gold-copper ore
The high grade of copper in the Igarapé Bahia (Brazil) gold-copper ore prevents the direct application of the classic cyanidation process. Copper oxides and sulfides react with cyanides in solution, causing a high consumption of leach reagent and thereby raising processing costs and decreasing recovery of gold. Studies have showm that a feasible route for t
Brazilian Journal of Chemical Engineering. Publicado em: 2003-09
-
8. The electrochemical behavior of tin dioxide based electrodes and electrochemical decomposition of cyanides / Comportamento eletroquímico de eletrodos a base de dióxido de estanho e sua aplicação na oxidação do cianeto
Tin dioxide based electrodes have a high overpotential for the OER and are relatively cheap. Due to these characteristics, they have a potential application is waste water treatment as anodes for electrochemical destruction of organics and inorganics. However, the service life of such electrodes are relatively short due to corrosion of the oxide layer during
Publicado em: 1997
-
9. Chronic cyanide exposure: a clinical, radioisotope, and laboratory study.
The effect of chronic cyanide exposure in the electroplating sections of three factories employing 36 workers was studied and compared with a control group. The concentration of cyanides to which the workers were exposed was measured. The regression line showing the relationship between thiocyanates in urine and the concentration of cyanides in the air was p
-
10. PROTON MAGNETIC RESONANCE STUDIES OF PORPHYRIN IRON (III) CYANIDES*
The nuclear magnetic resonance (NMR) spectra at 220 Mc of cyanodeuteroporphyrin IX dimethyl ester iron (III), cyanoprotoporphyrin IX diethyl ester iron (III), and cyanoprotoporphyrin IX iron (III) in a mixed solvent of 80 per cent d5-pyridine and 20 per cent D2O have been measured. The resonances are assigned and, except for the ester alkoxy groups, are show
-
11. Anaerobic biodegradation of cyanide under methanogenic conditions.
Upflow, anaerobic, fixed-bed, activated charcoal biotreatment columns capable of operating at free cyanide concentrations of greater than 100 mg liter-1 with a hydraulic retention time of less than 48 h were developed. Methanogenesis was maintained under a variety of feed medium conditions which included ethanol, phenol, or methanol as the primary reduced ca