Composite fluorine removal agent and preparation method

Abstract

The invention discloses a composite fluorine removal agent. The composite fluorine removal agent is formed by porous coal in a multi-layer hole diameter structure and active fluorine removal particles embedded in the porous coal. The active fluorine removal particles are produced by natural minerals containing Al or Mg through crushing and high-temperature activating in porous coal diameters. The active fluorine removal particles and the porous coal are firmly integrated and scattered uniformly. A preparation method comprises the steps of natural mineral crushing screening, composite fluorine removal agent precursor matching and activating, pore forming material removal and the like. According to the composite fluorine removal agent and the preparation method, the method is simple, the operation is facilitated, the prepared composite fluorine removal agent is used for removing fluorine in zinc sulfate leach liquor during zinc removal hydrometallurgy and has the advantages of being large in fluorine removal amount and rapid and efficient, the composite fluorine removal agent can be recycled through regeneration of inorganic aluminum salt, inorganic magnesium salt or alkali liquor easily, and the fluorine removal comprehensive cost is low.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy in nonferrous metallurgy, and in particular relates to a defluorinating agent used for removing fluorine in zinc sulfate leaching solution in zinc hydrometallurgy, and a preparation method of the defluorinating agent. Background technique [0002] Modern zinc smelting production processes are mainly divided into two categories: pyrometallurgy and hydrometallurgy. Among them, hydrometallurgy is the main process of zinc smelting due to its advantages of low energy consumption, environmental friendliness, and high metal recovery rate. Production has accounted for more than 85% of the world's zinc production. In the process of zinc hydrometallurgy, the fluorine content in the electrolyte is strictly controlled, because fluorine ions can destroy the aluminum oxide film on the surface of the cathode aluminum plate, making the zinc and the aluminum plate stick together and difficult to peel off, resulting ...

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Problems solved by technology

Lime milk or calcium carbonate is a more commonly used defluoridation agent, which is used to generate insoluble CaF 2 Precipitation to remove fluorine, but in the acidic system of zinc sulfate leaching solution, ZnF is easy to form + with MnF + Type matching ions, resulting in low fluoride removal efficiency; silica gel adsorption method can deal with low fluorine-containing solutions, but because the main principle is simple physical adsorption, the fluoride removal rate is low and zinc loss is serious; rare earth metal salts can form insoluble compounds with fluorine So as to achieve the purpose of defluoridation, but rare earth metal salts are expensive, and are not suitable for use in industry; magnesium salts and aluminum salts can also be used as defluoridation precipitation agents, especially in acidic systems, which show good defluorination activity. The price of fluorine agent is high and the dosage is large, and the cost of fluorine removal is high

In addition, CN1966407A discloses adding Al 3+ and PO 4 3- , producing Al 2 (PO 3 f) 3 Precipitation removes fluorine, but the zinc loss rate of this method is relatively high; CN101001693B discloses a method for adsorbing and removing fluorine from a zinc-containing solution by using iron compounds or zinc compounds, and patents CN102259946A, CN102357357A and CN104324684A disclose the use of iron compounds containing Ti, Zr, The raw materials of Ce and other elements can achieve good defluorination effect, but the cost of these defluorination materials is high, and the technical operation is difficult

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