Patent · US Expired

Treatment and disposal of wastewaters containing carbon black and ash

US4728437A · kind A · utility

3Cited by

4References

4Claims

0Family size

Assignee

BASF SE

Inventors

Hans Gettert · Mannheim, DE
Knut Kaempfer
Bruno Sander · Ludwigshafen, DE
Siegfried Marquardt · Frankenthal (Pfalz), DE
K. Robert Mueller · Heidelberg, DE

Key dates

Filing date	Aug 8, 1986
Grant date	Mar 1, 1988
Priority date	—
Expiry date	Aug 8, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/912
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Wastewaters which contain carbon black and ash and originate from high temperature processes and in which the carbon black is present in a very finely divided state and partially in a colloidal state are treated and disposed of by a process in which the wastewater is treated with calcium carbonate or calcium hydroxide and an organic flocculant and subjected to a two-stage filtration and the resulting filter cake containing carbon black and ash is subjected to an aftertreatment with an aqueous iron salt solution.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.