Factors Research on the Influence of Leaching Rate of Nickel and Cobalt from Waste Superalloys with Sulfuric Acid

Fan, Xiaohui; Xing, Weidong; Dong, Haigang; Zhao, Jiachun; Wu, Yue-Dong; Li, Bojie; Weifeng, Tong; Wu, Xia

doi:10.4236/ijnm.2013.22008

Cited by 31 publications

(16 citation statements)

References 7 publications

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“…Our results agree with (Cheng, et al, 2012) who proved that Al(III) leaching increases with reaction time until 20 min, but above 20 min the leaching reaction reaches a steady state that is not influenced by sulfuric acid concentration. Our findings also agree with Fan et al (2013) who reported that leaching rate of nickel and cobalt increase very quickly when leaching time is increased up to 5 hours, achieving a leaching rate of nickel and cobalt above 96%, but as leaching time increases beyond 5 hours, the leaching rate increased more slowly.…”

Section: Resultssupporting

confidence: 93%

“…Our results agree with (Cheng et al, 2012) by applying different temperatures 10, 40 and 70 8C and at a particular reaction time, Al(III) leaching rate increases with temperature. Our findings are compatible also with (Fan et al, 2013) who proved that leaching rate of nickel and cobalt in sulfuric acid solution is influenced much more by increasing temperature, the leaching rate of nickel and cobalt was 96.68 wt% when temperature was elevated to 85 8C.…”

Section: Resultssupporting

confidence: 93%

See 1 more Smart Citation

Utilization of Drinking Water Treatment Slurry to Produce Aluminum Sulfate Coagulant

Fouad¹,

Razek

El-Gendy

2017

Water Environment Research

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In Egypt, water treatment consumes about 365 000 tons of aluminum sulfate and produces more than 100 million tons of sludge per year. The common disposal system of sludge in Egypt is to discharge it into natural waterways. Toxicity of aluminum, environmental regulations and costs of chemicals used in water treatment and sludge treatment processes led to an evaluation of coagulant recovery and subsequent reuse. The present work aimed at aluminum recovery from sludge of El-Shiekh Zayd water treatment plant (WTP) to produce aluminum sulfate coagulant. Sludge was characterized and the effect of five variables was tested and the process efficiency was evaluated at different operating conditions. Maximum recovery is 94.2% at acid concentration 1.5 N, sludge weight 5 g, mixing speed 60 rpm, temperature 60 °C and leaching time 40 min. Then optimum conditions were applied to get maximum recovery for aluminum sulfate and compared to commercial coagulant on raw water of El-Shiekh Zayd (WTP).

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 93%

Utilization of Drinking Water Treatment Slurry to Produce Aluminum Sulfate Coagulant

Fouad¹,

Razek

El-Gendy

2017

Water Environment Research

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show abstract

“…However, the reaction is exothermic more temperature push the reaction forward that may be due to the solubility of aluminum hydroxide increased by temperature. Our findings were compatible also with (Fan et al, 2013) who proved that leaching rate of Ni and Co in sulfuric acid solution is influenced much more by increasing temperature, the leaching rate of Ni and Co was 96.68 wt% when temperature elevated to 85 ˚C. rpm, leaching efficiency does not show significant increase by increasing paddle speed.…”

Section: -2-impact Of Wts Weight On Recovery Of Al (Iii)supporting

confidence: 92%

Utilization of Drinking Water Treatment Sludge to Produce Aluminum Sulfate

M³

2016

Journal of Environmental Science

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In Egypt, water treatment industry consumes about 365,000 tons of aluminum sulfate as coagulant and produces more than 100 million tons of semidried sludge per year. The common disposal system of alum sludge in Egypt is to discharge it into natural water bodies. Toxic nature of free and complexed aluminum species to aquatic life, stringent environmental regulations on disposal of sludge into water bodies and costs of the chemicals used in water treatment process and sludge treatment led to evaluate coagulant recovery and subsequent reuse. The present work aimed at aluminum metal recovery from sludge obtained from El-Shiekh Zayd water treatment plant by acidification method to produce aluminum sulfate coagulant. Sludge from drying beds was characterized and sulfuric acid was selected as the acidic leaching medium and effect of five variables were tested: acid concentration (N), sludge weight (g), mixing speed (rpm), temperature (o C) and leaching time (min) was studied. Moreover, the process efficiency was evaluated at different operating conditions. Then optimum conditions were applied to get maximum recovery for aluminum sulfate. Maximum recovery is 94.2 % at acid concentration 1.5 N, sludge weight 5 g, mixing speed 60 rpm, temperature 60 o C and leaching time 40 min.

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“…The palm ash used in this research work has been pulverised to increase the leaching rate. Theoretically, the smaller size of the material, the easier to be heated and mass transfer, the higher leaching rate [12].…”

Section: Effect Of Reaction Temperaturementioning

confidence: 99%

Palm Ash as an Alternative Source for Silica Production

2016

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Abstract. Agricultural wastes such as palm ash and rice husk have a possibility to be used as a useful renewable source for the production of silica (SiO 2 ). Extensive researches have been carried out to extract silica from agricultural wastes such as rice husk, due to silica as a useful raw material for industrial application. In this study, the environmentally benign and economically effective process to produce SiO 2 materials from palm ash has been established by using citric acid leaching, not the conventional strong acids. Results showed that silica can be extracted from palm ash using the citric acid leaching method under the optimum extracting conditions with 700 0 C of solution temperature, 60 minutes of reaction time and concentration of citric acid of more than 2 %. The purity of silica extracted is more than 90 %.

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Factors Research on the Influence of Leaching Rate of Nickel and Cobalt from Waste Superalloys with Sulfuric Acid

Cited by 31 publications

References 7 publications

Utilization of Drinking Water Treatment Slurry to Produce Aluminum Sulfate Coagulant

Utilization of Drinking Water Treatment Slurry to Produce Aluminum Sulfate Coagulant

Utilization of Drinking Water Treatment Sludge to Produce Aluminum Sulfate

Palm Ash as an Alternative Source for Silica Production

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