Sulphuric acid is added into a vessel and slowly adds zinc in a granule form, followed by the heating process to completely dissolved the zinc in a certain heating temperature.
Zinc sulphate precipitate is obtained by leaving the zinc sulphate solution standstill after the heating treatment in the dissolution process for a certain time. The precipitated will be formed and zinc sulphate precipitate is obtained. The precipitate is filtered from the vessel, washed using cold water, and dried to obtain zinc sulphate with high purity.