Cobaltous sulfate solution evaporation system and process thereof

Abstract

The invention discloses a cobaltous sulfate solution evaporation system and a process thereof. The evaporation system comprises an evaporation unit, a vacuum unit, a preheating unit and a connecting pipeline, wherein the evaporation unit comprises a separator, a steam compression machine, evaporators and a forced circulation pump; a secondary steam outlet of the separator is directly communicatedwith the evaporators through pipelines and is indirectly communicated with the evaporators through the steam compression machine; the two groups of evaporators are in parallel and are communicated through the circulation pump; the vacuum unit comprises a two-stage condenser, a two-stage gas-liquid separator, a vacuum pump and a condensate tank; the preheating unit comprises four preheaters; a medium heat inlet and a second-level condensation liquid cooling medium outlet of a first-level preheater are connected with a heat medium outlet of a second-level preheater; a medium inlet of the second-level preheater is connected with a condensation liquid tank through a condensation liquid pump; a heat medium inlet of a third-level preheater is connected with non-condensable gas outlets of the evaporators. Compared with an existing evaporation process, the process utilizing the system for evaporating a cobaltous sulfate solution has the advantages of high heat recovery rate, high continuity and low investment cost.

Description

technical field [0001] The invention belongs to the technical field of evaporation, in particular to a mechanical vapor recompression evaporation system for cobalt sulfate solution. Background technique [0002] In the traditional cobalt sulfate evaporation and crystallization process, the evaporation process is mostly carried out by single-effect or multi-effect evaporation. The secondary steam of single-effect evaporation or the last stage steam of multi-effect evaporation is directly transferred to the cooling water outside the system by a vacuum pump, and at the same time It is necessary to build a cooling water circulation cooling system, and it needs to consume steam to maintain the evaporation temperature. The consumption of steam (0.8MPa) is about 0.8~1.2 tons / water. [0003] CN201610658077.7 discloses a device system for high-efficiency concentration and continuous crystallization of cobalt sulfate: applying MVR technology to the evaporation of cobalt sulfate soluti...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned evaporation system, and provide a set of mechanical vapor recompression evaporation system with the advantages of high heat recovery rate, strong continuity, and low overall equipment height, which is suitable for the evaporation of cobalt sulfate solution concentrate

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