bioleaching of nickel from spent petroleum catalyst usingthe enhanced recovery of nickel at very low ph was attributed to the higher acidic strength of sulfuric acid produced in the culture medium by the bacterium. during the bioleaching process, 89% of the ni present in the catalyst waste could be successfully recovered in optimized conditions.processing of spent nickelcatalyst for fat recoveryo catalizador niquel usado(snc) apresenta potencial de deterioracao da qualidade do meio ambiente de diversas formas. seu residuo tem efeito poluidor. uma otima recuperacao da gordura do snc poderia salvar o ambiente e reduzir as perdas de oleo. hexamo e o solvente mais utilizado na extracao de oleo. um solvente alternativo relacionado com seguranca esta sendo avaliado nesse trabalho.process for metals recovery from spent catalyst chevronmeans for recovery of vanadium, nickel and molybdenum from catalysts has been disclosed in other patents. for example, u.s. pat. no. 4,762,8 discloses a process for the recovery of a spent supported catalyst comprising molybdenum sulfide from a hydroprocess for the upgrading of a hydrocarbonaceous mineral oil containing nickel and vanadium.recovery of nickel from spent catalyst from palm oilmar 25, 10· ivascanu et al. reported 99% nickel sulfate recovery from spent catalyst via dissolution of the catalyst in sulfuric acid solution (80%) for 50 min at 70 °c. loboiko et al. reported that the recovery of nickel was increased by extractive leaching at 6070% nitric acid concentration at 1 °c for 23 h.cited by 24nickel recovery from spent raneynickel catalyst throughapr , 10· in the present study, a simple hydrometallurgical process using dilute sulfuric acid leaching was described for the recovery of nickel from spent raneynickel catalyst. recovery of nickel varied with acid concentration and time, whereas temperature had negligible effect.cited by 59 nickel recovery from spent raneynickel catalystdec 01, 09· in the present study, a simple hydrometallurgical process using dilute sulfuric acid leaching was described for the recovery of nickel from spent raneynickel catalyst. recovery of nickelestimated reading time 6 minsrecovery of nickel oxide from spent catalyst sciencedirectjan 01, 02· invascanu and roman studied the recovery of nickel from a spent catalyst in an ammonia plant by leaching it in sulfuric acid solution. ninetynine percent of the nickel was recovered as nickel sulfate when the catalyst, having a particle size of 0.09 mm, was dissolved in an 80% sulfuric acid solution for 50 min in at 70°c.cited by 1
the method of extraction of nickel from spent nickel catalyst(57) abstract use extraction of metals from spent catalysts can find application in the chemical and metallurgical industries. essence when removing nickel from spent nickel catalyst source material is crushed to particle size of not more than 1 mm, burn it in a stationary layer at 600 10 o c for 1 to 3 hours in a gaseous reducing atmosphere in the presence of solid pulverized lowrecovery of nickel from spent nio/al2o3 catalyst throughsep , · effective recovery of nickel (ni) from spent nio/al 2 o 3 catalyst in a simple hydrometallurgical route is suggested. nickel recovery of 99.5% was achieved with sulfuric acid leaching. the leach liquor was partly neutralized and nickel ammonium sulfate was precipitated by adding ammonia.nickel recovery from spent nickel catalystnickel recovery from spent nickel catalyst. a process for nickel recovery from a spent catalyst of definite composition has been developed using the hydrometallurgical route. the processing steps includes direct sulphuric acid leaching followed by separation of iron as well as silica and other impurities. for a 2 microm particle size catal.cited by 33leaching nickel, cobalt, molybdenum, tungsten, andnickel recovery suffers as the roast temperature of the spent catalyst particles is increased beyond 600° c. no metals are significantly better recovered than if the spent catalyst is roasted at 427° c. cobalt recovery is better after minutes at each roast temperature than after 0 minutes at the same roast temperature.recovery and characterization of nickel oxalate and oxidemar 30, · up to10%cash back· abdelaal and rashad studied nickel leaching kinetics on spent nickel catalysts (al 2 o 3nio) with 50 pct h 2 so 4 at 358 k extracted 94 pct nio. lee et al. recovered 98 pct nio with 100 pct purity by the precipitation and separation of al with na 2 co 3 solution at ph ~ 5.4 from a sulphuric acidleached solution of spent nickel catalysts (nioal 2 o 3 ).[ 5 ]cited by 2ep0058453a1 method of recovering nickel from a spent fatthe invention relates to a method of recovering nickel from a spent fat hardening catalyst which consists of finely divided nickel metal on a carrier for example of infusorial . earth and/or synthetic material and suspended in fat. the fat is saponified by means of an alkali solution to form a dissolved soap composition which is separated from the , nickel metal and the carrier.recovery of nickel from spent ni/al2o3 catalysts usingresearch work focuses on the recovery of nickel from spent nitrogenous catalyst using conventional acid leaching chelation route and a novel technique ultrasonication developed implemented successfully by the authors.recovery of nickel oxide from spent catalyst request firstly, nickel was recovered from spent catalyst using hno3leaching process. results show that nickel recovery of over 90% with a purity of over 90% can be achieved with hno3 2..5 m at
nickel recovery from spent nickel catalyst request most of the workers have studied the recovery of nickel from a spent catalyst in an ammonia plant by leaching it in sulphuric acid or in hydrochloric acid solution [1,3,  [nickel recovery from spent nickel catalyst kamala kapr 01, 05· a process for nickel recovery from a spent catalyst of definite composition has been developed using the hydrometallurgical route. the processing steps includes direct sulphuric acid leaching followed by separation of iron as well as silica and other impurities.cited by 33recovery of nickel from spent ni/al2o3 catalysts usingthe recovered nickel salts can be recycled for the preparation of fresh catalysts and promises to be a good industrial process for handling t per batch of spent nickel catalyst. references singh b., treatment of spent catalyst from thenitrogenous fertilizer industry a review ofthe available methods of regeneration, recovery and disposal intensification and optimisation of nickel recoverymay 29, · intensification and optimisation of nickel recovery from spent hydrogenation catalyst s via ultrasoundaugmented hydrometallurgy mitchell s.recycling nickel from spent catalyst of phu my fertilizerapr 05, · in this study, a very promising way of treating and recycling spent nickel catalysts of fertilizer plants in vietnam was proposed. firstly, nickel was recovered from spent catalyst using hno 3 leaching process. results show that nickel recovery of over 90% with a purity of over 90% can be achieved with hno 3 2..5 m at 100 °c in 75 min. the residue after leaching is not considered as abiocatalytic and chemical leaching of a lowgrade nickelnickel and cobalt recovery from a lowgrade nickel laterite ore, supplied from Çaldağ deposit (manisa, turkey) were investigated by bio and chemical leaching processes. the fungus, aspergillus niger was used for biocatalytic leaching experiments. therecovery of nickel from spent catalysts usingmay , · in the present study recovery of nickel from spent nickel catalysts using ultrasonicationassisted leaching has been investigated. result the effect on nickel recovery of acid concentration, temperature, solid to liquid (sl) ratio, and time of digestion were studied in detail and optimized for the ultrasonication route. leaching of nickel from a secondary source byfrom spent catalyst . also, 99% of nickel is recovered when using bartolozzi et al.  described a hydrometallurgical process for the acid concentration of 50%, particle size of below 500 mm, pulp density recovery of nickel and cadmium from nicd spent batteries.