关键词: 压滤机, 隔膜, 穿流, 反吹

Abstract: The dewatering effects of diaphragm squeeze, back flushing and cross-flow were discussed in filter-press processing of coal slimes and concentrates. Several equations were built, which describe the relations between cake moisture and compression ratio, cake’s relative density, and other parameters. According to these equations, the diaphragm squeeze process that increases cake compression ratio can reduce cake moisture rapidly, but shall face the limit when cake particles are over compactly deposited. Back flushing process can only decrease moisture content indistinctively, showing its main purpose is to ensure the stability of products’ quality. In ideal situation, cross-flow processing can reduce cake moisture to Mad, which is essential when the moisture content requirement is even higher and compression ratio cannot reach to the required level. But in practice, the cake shall not be over compacted to ensure the processing works right. A field experiment was conducted in a coal separating plant suffering several problems on filter-press processing. The result indicated that, cycle time was shortened and the cake moisture decreased by 3% to 5%, through increasing the pressure of squeeze, adding filter aids and changing the operating procedure.

Key words: filter press, diaphragm, cross-flow, back flushing