Study on detection and control system of coal flotation

The automation of coal flotation has been wandering for many years in China. The production efficiency is relatively low because of the feed forward control which adds the flotation reagent based on the fine coal in feed slurry, ignoring the quantity and quality of the products. Aiming at this problem, the method of measuring the flotation technical parameters was studied, and the slurry level meter and slurry ash-measuring device were developed. At the same time the computer control system of coal flotation was designed. The feedback control was realized by using the fuzzy logic control technology to regulate the reagent addition and the slurry level in the flotation tank according to the concentrate ash content detected by the coal slurry ash-measuring device. The industrial experiment indicates that the performance indexes of the coal slurry ash-measuring device have come up to the advanced level of the world. The application of the detection and control system in Huaibei Coal Preparation Plant results in a high concentrate recovery and a decrease of the reagent consumption, so that a high efficient operation can be realized.