Patents Assigned to Allied Colloids Limited
  • Processes for flotation of mineral substances
    Patent number: 4078993
    Abstract: A method of concentrating a metalliferous ore containing also substantial quantities of pyrites and/or pyrrhotite and/or sphalerite and comprises subjecting an aqueous pulp of the ore to a froth flotation process in the presence of a depressant and in which (1) pyrites and/or pyrrhotite, and/or (2) sphalerite, is depressed by using as the depressant a condensation product of an aldehyde with a compound containing at least two amine or amide groups.
    Type: Grant
    Filed: February 20, 1976
    Date of Patent: March 14, 1978
    Assignee: Allied Colloids Limited
    Inventors: Robert M. Griffith, Christopher Parkinson, Ronald A. Palmer
  • Removal of phosphorous from waste water
    Patent number: 4043910
    Abstract: Phosphate is removed from an aqueous medium by adding inorganic coagulant followed by a cationic polyelectrolyte which is a water-soluble quaternary ammonium salt of a high molecular weight copolymer of acrylamide and an alkylaminoalkyl ester of acrylic or methacrylic acid. The process is of particular value in reducing the phosphate content of sewage effluent.
    Type: Grant
    Filed: June 3, 1976
    Date of Patent: August 23, 1977
    Assignee: Allied Colloids Limited
    Inventors: John Rodney Field, Kenneth Guthrie Andrew
  • Process for settling red mud in the digestion of bauxite
    Patent number: 3975496
    Abstract: The invention provides novel water-soluble copolymers useful as flocculating agents, especially in flocculating the red mud formed during the Bayer process for the production of alumina from bauxite. The copolymers comprise anionic monomer units e.g. acrylic acid units in a mole percentage of less than 50% and acrylamide type units some of which are methylolated.
    Type: Grant
    Filed: October 7, 1974
    Date of Patent: August 17, 1976
    Assignee: Allied Colloids Limited
    Inventors: Graham Smalley, Eric Rothwell