Fluorine-removing process for zinc sulphate solution

Abstract

The invention relates to the technology of removing fluorine by zinc sulphate solution, which belongs to the way of removing fluorine in the neutral extracted supernatant during the wet process of refining zinc. In the invention, after adding Al3+ and PO43- to the neutral extracted supernatant which contains fluorine, the fluorine is precipitated so it can be removed from the solution. The advantages of the invention: short technological flow-sheet, easy to operate, high fluorine-removing rate, less loss of elements with valence, more available to the cheap accessories and low operating cost.

Description

technical field

[0001] The invention belongs to a method for removing fluorine in neutral leaching supernatant liquid in zinc hydrometallurgy. Background technique

[0002] In zinc hydrometallurgy, the main source of fluorine is that it is brought into the leachate when dealing with fluorine-containing zinc oxide ore and sublimation fumes (hereinafter referred to as fluorine-containing materials). For this reason, when dealing with fluorine-containing materials, fluorine removal methods can generally be divided into two categories: one is defluorination from the material before leaching, and the other is defluorination from the solution after the material is leached.

[0003] There are two kinds of defluorination of materials before leaching: fire method and wet method alkaline cleaning. Fire methods such as the multi-hearth furnace roasting of Zhuzhou Smelter and the rotary kiln roasting of Port Pirie, Australia, have huge equipment, high investment, high energy consumptio...