独居石碱转滤液精细过滤工艺改进研究

Improvement of Fine Filtration of Filter Liquor of Monazite Alkali Decomposition

在独居石碱转滤液的精细过滤生产中,采用铁板框压滤机压滤存在过滤效果差、自动化水平低、过滤后温度下降多等问题。对现有精细过滤工序进行改进,研究了表面过滤器作为碱转滤液精细过滤设备的适用性。结果表明,滤芯为PP、PTFE膜材质的表面过滤器,其1.0 h后过滤截留率均高达93%;明显高于铁板框压滤机的截留率。与铁板框过滤相比,表面过滤器过滤效果好、自动化水平高、溶液保温效果好,可较好地应用于独居石碱转滤液的精细过滤中。

In the fine filtration production of filter liquor of monazite alkali decomposition,the use of iron plate and frame filter had problems such as poor filtration effect,low automation level,and significant temperature drop after filtration.Improvements were made to the existing fine filtration process,and the applicability of surface filter as fine filtration equipment for filter liquor of monazite alkali decomposition was studied.The results show that the surface filter with PP and PTFE membrane materials has a filtration retention rate of 93%after one hour,which is higher than the retention rate of the iron plate and frame filter.Compared with the iron plate and frame filtration,the surface filter has better filtration efficiency,higher automation level,and better solution insulation effect,which can be well applied in the fine filtration of filter liquor of monazite alkali decomposition.