GB933337A - A method of regulating the quantity of flow and the solid content of a pulp or slurry - Google Patents

Abstract

933,337. Mixing solids with liquids in flow. KLOCKNER-HUMBOLDT DEUTZ A.G. Feb. 17, 1960 [June 1, 1959], No. 5627/60. Class 86. [Also in Group XXIX] In a method and apparatus for regulating the solid content of a pulp or slurry, so as to supply a constant quantity per unit time of slurry of a constant solids content and constant grain size, coarse and fine grain dense slurries are supplied from concentrators 30, 30<SP>1</SP> in constant proportions to an intermediate tank 37, thence via a pipe 55 to another intermediate tank 56, and from there through pipe 68 to a mixer 69, to which is also supplied dilution water from pipe 73. The final mixture thus formed flows up a tube 76 having two dip-tubes 77, 78 supplied with compressed air at constant pressure. The pressure set up in the pipes 81, 82 is a measure of the depth of penetration in the tubes and, with a predetermined difference of penetration, the difference in pressures is a measure of the specific gravity of the slurry. The measured value controls the inflow of slurry and carrier liquid into the mixer 69 through the valves 90, 92 which move in opposite directions in such a manner that the sum of the flows remains constant. A dip-tube 38 in the tank 37 controls the valves 35, 35<SP>1</SP> so that the level in that tank remains constant while another dip-tube 57 in the tank 56 provides an over-riding control of the valves 35, 35<SP>1</SP> if the level in the tank 56 should rise too high. The apparatus is primarily intended for use in the separation of coal by flotation.