Process for the treatment of acidic waste liquid containing diss

Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow

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210 53, C02B 126

Patent

active

040060802

ABSTRACT:
A process for the treatment of aqueous sulphuric acid solutions of a metal salt or salts containing ferrous sulphates wherein the pH value of the solution is adjusted by the addition of a calcium compound to selectively precipitate calcium sulphate after which the precipitated calcium sulphate is separated and calcined before adjusting the pH of the mother liquor to a value in the range 7 to 9 by the addition of a calcium-containing compound to precipitate there from solid metal compounds which are then separated and/or calcined.

REFERENCES:
patent: 1310382 (1919-07-01), Auld et al.
patent: 3800024 (1974-03-01), Forsell et al.

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