Cleaning and disposal of carbon black and ash containing wastewa

Details Cleaning and disposal of carbon black and ash containing wastewa Cleaning and disposal of carbon black and ash containing wastewa

1988-03-21

1989-05-09

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210725, 210727, 210751, 210912, C02F 154

Patent

active

048287156

ABSTRACT:
Carbon black and ash containing wastewaters from high-temperature processes in which the carbon black is present in an extremely finely divided and partly colloidal state are cleaned and disposed of by treatment with organic flocculants, predewatering of the flocculated suspension by gravity filtration and post-dewatering of the carbon black sludge by pressure filtration within the range from 0.5 to 15 bar in a process comprising adding sufficient calcium hydroxide to the wastewaters that the pH of an aqueous extract of the filter cake obtained is more than 11.8, preferably more than 12.0.

REFERENCES:
patent: 4500324 (1985-02-01), Vuong
patent: 4728437 (1988-03-01), Gettert et al.

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