초록 ▼

A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminarily can be treated by adding carbon and an ammonium chloride solution, separating any undissolved componen

A method for the recovery of high purity zinc oxide products, and optionally iron-carbon feedstocks, from industrial waste streams containing zinc oxide and/or iron. The waste streams preliminarily can be treated by adding carbon and an ammonium chloride solution, separating any undissolved components from the solution, displacing undesired metal ions from the solution using zinc metal, treating the solution to remove therefrom zinc compounds, and further treating the zinc compounds and the undissolved components, as necessary, resulting in the zinc products and the optional iron-carbon feedbacks. Once the zinc oxide has been recovered, the purification process is used to further purify the zinc oxide to obtain zinc oxide which is at least 99.8% pure and which hsa predeterminable purity and particle characteristics.

대표청구항 ▼

[ What is claimed is:] [1.] A method for purifying zinc oxide to obtain zinc oxide crystals comprising the steps of:a. dissolving a zinc oxide containing material in an intermediate to form a solution;b. filtering out any undissolved materials;c. precipitating zinc oxide crystals out of the intermed

[ What is claimed is:] [1.] A method for purifying zinc oxide to obtain zinc oxide crystals comprising the steps of:a. dissolving a zinc oxide containing material in an intermediate to form a solution;b. filtering out any undissolved materials;c. precipitating zinc oxide crystals out of the intermediate by diluting the solution by a factor ranging from 3 to 30, by volume by the addition of water at a temperature ranging from 70.degree. C. to 100.degree. C.; andd. filtering out said zinc oxide crystals.