Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1977-05-02
1978-12-26
Hart, Charles N.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 52, 210 10, 210 66, 252175, 252317, 423305, C02B 120
Patent
active
041315456
ABSTRACT:
Phosphate containing basic aluminum solutions are provided by reaction aluminum sulphate solution with phosphoric acid, adding chloride, basifying by precipitation of calcium sulphate from solution and cooling the resultant solution in a controlled manner. Preferably addition of chloride and basification occurs at a temperature of 80.degree.-90.degree. C and the solution is cooled to below 60.degree. C soon after the basifying salts have been introduced. The solutions, preferably diluted to an aluminum content of 1 to 2% Al.sub.2 O.sub.3 are useful for clarifying water and dewatering sewage sludge.
REFERENCES:
patent: 3929666 (1975-12-01), Aiba et al.
Berry David
Redmayne William H.
Castel Bendoit
Hart Charles N.
Laporte Industries Limited
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