Slurry concentration and dilution apparatus

Concentration control apparatus in a slurry system comprising:

• a. a circular side wall with first and second ends attached thereto in a manner to define a chamber;
• b. a first, second and third tangential port means mounted on said side wall and opening into said chamber;
• c. an axial outlet port attached to one of said end walls and opening into said chamber;
• d. a source of fluid;
• e. means coupling said source of fluid to said third tangential port, said coupling means including a controllable valve means;
• f. means coupling said first tangential port to said slurry system;
• g. means coupling said second tangential port to said slurry system;
• h. means coupled to said second tangential means for measuring the density of slurry through said means and generating an output signal in response to said measured density;
• and
• i. control means accepting said output signal and generating a response signal to said controllable valve means
• whereby slurry flowing into said chamber through said first tangential port and out of said chamber through said second tangential port can have its density uniformly reduced by injecting fluid into said chamber through said third tangential port.