Effect of Operating Parameters and Chemical Additives on Crystal Habit and Specific Cake Resistance of Zinc Hydroxide Precipitates

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The effect of process parameters and chemical additives on the specific cake resistance of zinc hydroxide precipitates was investigated. The ability of a slurry to be filtered is dependent upon the particle habit of the solid and the particle habit is influenced by certain process variables. The process variables studied include neutralization temperature, agitation type, and alkalinity source used for neutralization. Several commercially available chemical additives advertised to aid in solid/liquid separation were also examined in conjunction with hydroxide precipitation. A statistical analysis revealed that the neutralization temperature and the source of alkalinity were statistically significant in influencing the specific ... continued below

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126 pages

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Alwin, Jennifer Louise August 1, 1999.

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The effect of process parameters and chemical additives on the specific cake resistance of zinc hydroxide precipitates was investigated. The ability of a slurry to be filtered is dependent upon the particle habit of the solid and the particle habit is influenced by certain process variables. The process variables studied include neutralization temperature, agitation type, and alkalinity source used for neutralization. Several commercially available chemical additives advertised to aid in solid/liquid separation were also examined in conjunction with hydroxide precipitation. A statistical analysis revealed that the neutralization temperature and the source of alkalinity were statistically significant in influencing the specific cake resistance of zinc hydroxide precipitates in this study. The type of agitation did not significantly effect the specific cake resistance of zinc hydroxide precipitates. The use of chemical additives in conjunction with hydroxide precipitation had a favorable effect on the filterability. The morphology of the hydroxide precipitates was analyzed using scanning electron microscopy.

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126 pages

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OSTI as DE00010599

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  • Other Information: TH: Thesis (M.S.); Submitted to New Mexico State Univ., Dept. of Chemical Engineering, Las Cruces, NM (US)

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  • Report No.: LA-13611-T
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/10599 | External Link
  • Office of Scientific & Technical Information Report Number: 10599
  • Archival Resource Key: ark:/67531/metadc626506

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  • August 1, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 1:14 p.m.

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Alwin, Jennifer Louise. Effect of Operating Parameters and Chemical Additives on Crystal Habit and Specific Cake Resistance of Zinc Hydroxide Precipitates, thesis or dissertation, August 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc626506/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.