Chromium Sulphate Recovery Plants Manufacturere

of total chromium salts reacts with the hides. In the other word, about 30-40% of the chromium amount remains in the solids and liquid wastes (especially spent tanning solutions). Therefore, the removal and recovery of the chromium content of these wastewaters are necessary for environmental protection and economic reasons.

Chromic oxide is a bright green hygroscopic powder with melting point of 2435°C, boiling point of 4000°C and specific gravity of 5.2. Chromium acetate is a grey-green to blue green pasty mass. Chromium nitrate is a pale green powder. Chromium chloride is a hygroscopic compound with melting point of 1152°C and specific gravity of 2.8.

Chromium recovery/reuseThe recovery and reuse strategy involves initially the separation of chromium from soluble neutral salts as chromic hydroxide (Covington et al., 1983). Chromium(III) is easily precipitated as chromic hydroxide by the addition of an alkali to spent chromium tanning solution (Hauck, 1972; Sreeram et al., 1999).

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Basic chromium sulphate produced effects in the mediastinal lymph node, lungs, laynx and nasal cavity. Pigment was still present in basic chromium sulphate-treated animals after the 13 -week recovery period, with partial recovery of the pathological lesions, and therefore, a NOAEC was not established in this study.

As chromium, particularly in the hexavalent oxidation state, is a toxic material, considerable attention was paid at the design stage in minimising emissions, both liquid and gaseous, from the plant. Emissions of chromium from the plant stacks are monitored regularly, but are rarely at detectable levels.

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Hexavalent Chromium Removal by Reduction with Ferrous Sulfate, Coagulation, and Filtration: A Pilot-Scale Study

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