Slurry processing apparatus and related methods

A method for producing an emulsion comprising

• introducing a slurry into a macerator inlet, the macerator comprising
• a) a housing that defines a chamber an inlet and an outlet, the inlet configured to receive a flow of slurry,
• b) two or more elongate concentric bodies located within the chamber to define a gap between the surface of the outer body and the inner surface of the housing, the bodies having a first end and a second end, at least one of the bodies rotatable about an axis, and each body comprising a plurality of apertures to define a flow path through each body, from the housing inlet to the housing outlet,
• c) a baffle or baffles that extend substantially the width of the gap from the first end to the second end of the bodies to define a first portion that contains the inlet, and a second portion that contains the outlet, and wherein the baffle or baffles substantially inhibit passage of slurry between the two portions via the gap such that the slurry is directed through the body apertures,
• d) a motor to drive the rotating body or bodies,
• e) one or more injectors that inject liquid into the gap, wherein at least one of the injectors is located in the first portion, and
• operating the motor to drive one or more of the bodies such that the slurry transverses the apertures of the bodies to the outlet, and
• wherein the particle size of the outlet slurry is less than the particle size of the inlet slurry.