Study and application of the slime water system management and control technologies

For enhancing the flotation process management level and the intelligent level of the slime water treatment system, a study is made on the management and control technologies with the slime water system of the coal preparation under Sanhekou Mining Co. as the object of study. The paper elaborates on the effects obtained in application of the technologies derived through study, from the perspectives of technical transformation, washing process management and intelligent construction. Practice shows that through the technical reform and the application of the technologies for checking the entry of coarse particles into centrate of slime centrifuge and for separate treatment of magnetic tailings of middlings and refuse, the yield of clean coal is noticeably increased; with the use of the flotation concentrate ash-tailings ash-reagent dosage correlated mathematical model, the addition of agents can be made under intelligent control; as the detection of feed pressure of the classifying cyclone and the liquid level of the cyclone′s feed tank are all made automatically, the cyclone can work with a high efficiency and the phenomenon of escape of coarser particles to cyclone′s overflow is eliminated; because of the use of turbidity meter and realization of intelligent dosing of flocculant, the agent preparation and doing can be made in an integrated and unmanned manner; thanks to the possibility to detect even a very small flow and the liquid level of slime water agitating tank by using monitoring and control system, the filter press can carry out smart operation by dint of the automatic diagnosis and intelligent identification system; the filter press is made possible to operate in a safe and clean manner due to use of the blowout preventer and the high-efficiency air-water (solids) separator; with the use of the independently developed high-efficiency and energy-saving slime breaker-mixer, homogeneous mixing of flotation concentrate with clean coal of the primary washing system is made possible. Application of the upgraded slime water treatment system management and control technologies has made it possible to effectively ensure the steady operation of the coal washing system and improve both product quality and economic performance of the coal preparation plant.