Process for preparing zinc sulfate

Abstract

The invention provides a process for preparing zinc sulfate and the process is simple in step, low in energy consumption, high in production efficiency and high in product purity. The process comprises the following steps: putting secondary zinc oxide and zinc oxide in waste residues produced in zinc preparation in a raw material tank filled with dilute sulfuric acid, reacting to generate a zinc sulfate solution, guiding the zinc sulfate solution into a reaction tank, removing impurities such as iron, cobalt and copper in the reaction tank, filtering the impurities through a filtering machine, guiding the zinc sulfate solution into a storage tank for precipitation, evaporating the zinc sulfate solution in an evaporator to obtain a concentrated solution, crystallizing in a crystallizing tank, carrying out crystal separation in a centrifugal machine, cooling to obtain zinc sulfate containing crystal water and drying in a dryer to obtain the zinc sulfate. According to the process, the zinc sulfate solution is concentrated in the way of pouring hot oil and circularly heating, so that the heating temperature is higher, the heating material can be recycled, the energy consumption is little and the cost is reduced. The process for preparing the zinc sulfate is simple and clear in processing step, energy-saving, friendly to the environment and convenient to operate.

Description

[0001] technical field [0002] The invention relates to a production process of chemical raw materials, in particular to a process for preparing zinc sulfate. Background technique [0003] As we all know, the preparation of zinc sulfate must go through the process of evaporation and crystallization. Evaporation and crystallization is the process of changing the solution from unsaturated to saturated by evaporating the solvent, and continuing to evaporate, and the excess solute will be precipitated in the form of crystals. However, in the prior art, ordinary evaporation equipment and processes are used to obtain hydrous zinc sulfate or anhydrous zinc sulfate by evaporating water and cooling and crystallizing. These evaporation crystallization processes currently used have cumbersome steps, high energy consumption, and low production efficiency. Low, zinc sulfate purity is not high and other shortcomings. Contents of the invention [0004] In order to solve the above-m...

AI Technical Summary

Problems solved by technology

However, in the prior art, ordinary evaporation equipment and processes are used to obtain hydrous zinc sulfate or anhydrous zinc sulfate by evaporating water and cooling and crystallizing. These evaporation crystallization processes currently used have cumbersome steps, high energy consumption, and low production efficiency. Disadvantages such as low and low purity of zinc sulfate

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