Concentration production device for mirabilite-method barium sulfate byproduct sodium sulfide

Abstract

The invention discloses a concentration production device for a mirabilite-method barium sulfate byproduct sodium sulfide. The device includes a sodium sulfide solution inlet, a first-stage preheater,a first-stage settling tank, a second-stage settling tank, a microfilter, a second-stage preheater and a separator that are sequentially connected through pipelines; the at least one evaporation heating chamber and the separator form a closed loop; the lower part of the separator is connected to a concentrated liquid outlet through a pipeline; the first-stage settling tank comprises a box body, amotor, a scraping plate and a rotating shaft; a scraping plate is arranged in the box body; the scraping plate is attached to the bottom of the box body; the scraping plate is arranged on the rotating shaft; the rotating shaft is rotatably connected to the box body; and the motor drives the rotating shaft to rotate. According to the invention, the sodium sulfide solution is filtered and settled before separation, scaling in the evaporator is avoided, and the concentration efficiency of the sodium sulfide solution is improved; the motor drives the rotating shaft to rotate to drive the scrapingplate to rotate, pipe blockage is prevented, disassembly and cleaning are avoided, and a large amount of manpower and material resources are saved.

Description

technical field [0001] The invention relates to the concentration field, in particular to the concentration production field of sodium sulfide. Background technique [0002] Sodium sulfide is one of the main by-products in the production of barium sulfate by Glauber's salt method, and its concentration is as low as 5% (wt). In actual production, the low-concentration sodium sulfide by-product needs to be concentrated as a downstream industrial product. At present, the commonly used concentration method is multi-effect evaporation, and because sodium sulfide contains barium sulfate, calcium sulfate, calcium carbonate and other trace insoluble substances, it is easy to foul in the evaporator and cause tube blockage, which requires frequent disassembly and cleaning, which takes a lot of labor. Coupled with multiple factors such as high energy consumption of multi-effect evaporation, the production cost of sodium sulfide remains high, which seriously reduces the production effic...

AI Technical Summary

Problems solved by technology

At present, the commonly used concentration method is multi-effect evaporation, and because sodium sulfide contains barium sulfate, calcium sulfate, calcium carbonate and other trace insoluble substances, it is easy to foul in the evaporator and cause tube blockage, which requires fr

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