Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1978-02-13
1980-01-29
Castel, Benoit
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 46, 423142, C02B 120
Patent
active
041860888
ABSTRACT:
An aqueous ferrous sulfate waste stream is converted into sludge and improved water effluent by a preferably ambient indoor temperature and pressure flow process comprising: turbulently mixing said stream with a substantial excess of gaseous oxygen and a small excess of impalpable calcium carbonate in a reaction zone until the iron content of said stream is virtually all sludged; classifying resulting sludge into a coarser solids fraction (a portion of which is recycled to the sludging operation) and an aqueous suspension of finer solids; and separating finer solids from such aqueous suspension. As such streams usually contain free sulfuric acid, it is desirable to first precipitate from the stream a primary gypsum product by neutralization prior to such sludging operation.
REFERENCES:
patent: 3375066 (1968-03-01), Murakami et al.
patent: 3617559 (1971-11-01), Cywin
patent: 3849535 (1974-11-01), Irani
Knowles C. L.; "Waste Pickle Liquors;" Steel (Industry Week); vol. 104, No. 20 (1939).
Hoak R. D.; "Waste Pickle Liquor;" Industrial & Engin. Chem.; vol. 39, p. 614, May 1947.
Fitch Steven J.
Heiser David J.
Peeling Philip R.
Becker Gordon P.
Castel Benoit
Douthitt Merton H.
Mueller, Jr. Jerry K.
SCM Corporation
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