Zinc sulfate evaporative crystallization drying equipment and process thereof

Abstract

The invention relates to zinc sulfate evaporative crystallization drying equipment and a process thereof. The equipment comprises a stock solution preheating unit, an evaporative crystallization unit,a thickening unit, a filtering separation unit and a drying unit which are connected in sequence, and also comprises a control unit. According to the equipment, a zinc sulfate solution is automatically treated through the stock solution preheating unit, the evaporative crystallization unit, the thickening unit, the filtering separation unit and the drying unit in sequence, the zinc sulfate solution is directly prepared into zinc sulfate through evaporative crystallization, the production equipment is high in automation degree, the production efficiency is high, and the equipment is simple instructure, small in occupied area and low in investment cost, and is low-energy-consumption and environment-friendly production equipment. The invention also discloses an evaporative crystallization process, the zinc sulfate solution is preheated, evaporated, concentrated and crystallized to obtain a monohydrate product, the product is filtered and separated, and the crystallized salt is dried toobtain a product. The process has the advantages of simple steps, low energy consumption and low production cost, and the energy consumption is further reduced.

Description

technical field [0001] The invention relates to the technical field of zinc sulfate production, and more specifically refers to zinc sulfate evaporative crystallization drying equipment and a process thereof. Background technique [0002] Pure zinc sulfate is colorless or white crystals, granules or powder, aliased as alum, odorless and astringent. It is an important inorganic chemical product with a wide range of uses. In industry, it is the main raw material for the manufacture of lithopone and zinc salt. It can also be used as a printing and dyeing mordant, a preservative for wood and leather, and a stabilizer for circulating cooling water. It is also an important auxiliary raw material for the production of viscose fiber and vinylon fiber. In addition, it is also used in electroplating and electrolysis industries, and can also be used to make cables. In medicine, oral zinc sulfate can correct zinc deficiency and restore the function of the enzyme system. Zinc ions can...

AI Technical Summary

Problems solved by technology

[0003] At present, zinc sulfate is usually prepared by the process of evaporation, concentration and crystallization. In the traditional evaporation crystallization process, the evaporation process is mostly carried out by single-effect or multi-effect evaporation. Among them, the secondary steam of single-effect evaporation or the last stage steam of multi-effect evaporation can be It is directly transferred to the cooling water outside the system by the vacuum pump. In this way, it is necessary to build a cooling water circulation cooling system, and it needs to consume steam to maintain the evaporation temperature. There are problems of energy consumption, high equipment investment cost, and low production efficiency. Zinc has the problem of being extremely deliquescent in the air

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