Three-stage countercurrent washing process and device for calcium carbonate based on gypsum conversion

Abstract

The invention relates to a three-stage countercurrent washing device for calcium carbonate based on gypsum conversion. The three-stage countercurrent washing device comprises an automatic discharging centrifugal machine, a washing liquid pump, a washing tank set, an upper water pipe, a lower water pipe and a centrifugal machine rack; the automatic discharging centrifugal machine is located over the washing tank set and fixed through the centrifugal machine rack, an outlet of the automatic discharging centrifugal machine is connected with an inlet of the washing tank set through the lower water pipe, and an outlet of the washing tank set is connected with an inlet of the automatic discharging centrifugal machine through the washing liquid pump and the upper water pipe; the washing tank set comprises a first-stage washing liquid tank, a second-stage washing liquid tank, a third-stage washing liquid tank, a clear water tank and a solid material tank, and the first-stage washing liquid tank, the second-stage washing liquid tank, the third-stage washing liquid tank and the clear water tank are all of an annular columnar structure. The three-stage countercurrent washing device has the beneficial effects that the washing tank set is of the annular structure, the automatic discharging centrifugal machine is located over the washing tank set, the equipment structure is reasonable, the arrangement mode is compact, and the problems of washing water consumption and equipment land occupation in a washing process are well solved.

Description

technical field [0001] The invention relates to a calcium carbonate solid water washing process, in particular to a calcium carbonate solid water washing process based on a reaction product of gypsum conversion. Background technique [0002] Industrial by-product gypsum and other chemical substances (such as ammonium carbonate, sodium carbonate, ammonium bicarbonate, etc.) can react to form calcium carbonate and another compound, which is generally soluble, so the reaction mixture product needs to be filtered for product separation. The separated solid calcium carbonate will contain a certain amount of water, and this compound (such as ammonium sulfate, sodium sulfate, etc.) will be dissolved in the water. Therefore, in order to avoid calcium carbonate containing other impurity components, it needs to be washed. The washing liquid after washing will be poured into the separation liquid. In order to reduce the cost of subsequent water treatment, the lower the amount of washin...

AI Technical Summary

Problems solved by technology

The conventional washing method is to directly wash the solid matter with clean water, and perform multiple washings until the content of other components in the solid is reduced to a certain extent, but the disadvantage of this method is that the amount of washing water is large, which increases the cost of subsequent water treatment

The multi-stage washing method can reduce the amount of water washing, but the system is complex and occupies a large area

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