How to remove chloride ions from feed-grade zinc sulfate without losing the zinc sulfate in the solution. Let me explain to you how to remove chloride ions. Generally speaking, there are methods for reducing chloride ions in zinc sulfate heptahydrate.
1. The elemental copper contained in the copper slag is oxidized to produce divalent copper ions, which react with the chloride ions in the industrial zinc sulfate solution to generate Cucl precipitation that is difficult to dissolve, so as to remove the chloride ions in the zinc sulfate solution. In this method, copper can be fully utilized in the hydro-zinc smelting process without adding waste gas or slag. Therefore, the economic benefits are more significant.
2. If you are an electrolytic zinc customer, you can directly evaporate the zinc sulfate saturated solution to obtain zinc sulfate heptahydrate, grind and add excess barium chloride, add excess concentrated sulfuric acid, and filter to obtain pure zinc sulfate.