Abstract: Small particles and fines included along with larger subdivided solids are treated with liquid to extract soluble solids therein in an apparatus and process using milli-screens with milli-sized openings of less than about 0.095 inches across. The milli-screen openings may be kept open for the passage of liquids with specially-designed wipers and/or back-flushing from a liquid compartment and/or rotation of the milli-screen past the matrix of subdivided solids, the subdivided solids themselves acting as a screen cleaner. The invention is useful in batch or continuous diffusers for extracting soluble solids from subdivided solids containing small particles and fines.

Abstract: A safety disconnect system for an installation comprising machines which are designed to interact, has a machine disconnect level in which a dedicated disconnect circuit is allocated to each machine, an area disconnect level, in which disconnect areas which comprise groups of associated machines can be disconnected, and a system disconnect level which is allocated to all the machines of the installation. The disconnect circuits in each case have an electrically operable switching element which is connected via safety circuits to a main box for the central control of the safety disconnect system and, through this box, to a power supply. The safety circuits have operable tripping elements at the area disconnect level and at the system disconnect level, are constructed as latching circuits and are passed through the main box in which they can optionally be linked to one another by means of a switching matrix such that groups of associated machines are disconnected if one of the tripping elements is operated.