Magnesium fluoride electrochemical separating and utilizing method in wet-method zinc smelting technology

Abstract

The invention discloses a magnesium fluoride electrochemical separating and utilizing method in a wet-method zinc smelting technology. The method is characterized by comprising the steps: adding magnesium fluoride seed crystal and zinc fluoride into a magnesium containing zinc sulfate solution to obtain coarse grain magnesium fluoride precipitate and performing liquid-solid separation; adding a potassium hydroxide solution into the magnesium fluoride precipitate to obtain magnesium hydroxide precipitate and a potassium fluoride solution, filtering and separating; adding the potassium fluoridesolution and a stabilizer into a diaphragm electrolyzer to be electrolyzed to obtain potassium hydroxide and zinc fluoride; quickly burning the magnesium hydroxide to obtain magnesium oxide; adding magnesium sulfate, an organic additive, an inorganic additive, a reinforcing agent and crystal whisker into the magnesium oxide and evenly mixing to obtain magnesium sulfate cement. Compared with the existing technical scheme, the method has the characteristics of short technological process, moderate reaction, high production efficiency and good product quality.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste residues, in particular to the removal and utilization of magnesium in a zinc hydrometallurgy solution. Background technique [0002] Magnesium is a common associated impurity element in zinc ore. In the zinc hydrometallurgy process, after roasting and leaching, most of the magnesium enters the zinc hydrometallurgy process in the form of sulfate, and only a small amount of magnesium in the zinc concentrate The solution and the slag are open, and most of the magnesium is not open in the electrolyte circulation, and it is difficult to remove during the purification process, which will cause the enrichment of magnesium in the zinc hydrometallurgy process; at the same time, the zinc sulfate solution contains A large number of sulfate radicals, when the temperature of the solution system decreases, magnesium will salt out and crystallize in the form of magnesium sulfate dihydrate...

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Problems solved by technology

[0002] Magnesium is a common associated impurity element in zinc ore. In the zinc hydrometallurgy process, after roasting and leaching, most of the magnesium enters the zinc hydrometallurgy process in the form of sulfate, and only a small amount of magnesium in the zinc concentrate The solution and the slag are open, and most of the magnesium is not open in the electrolyte circulation, and it is difficult to remove during the purification process, which will cause the enrichment of magnesium in the zinc hydrometallurgy process; at the same time, the zinc sulfate solution contains A large amount of sulfate radicals, when the temperature of the solution system is lowered, the magnesium will salt out and crystallize in the form of magnesium sulfate dihydrate, which will lead to pipeline blockage and scaling on the tank wall during the hydrometallurgy process, and will also affect The current efficiency of the electrowinning process increases the energy consumption of zinc hydrometallurgy [Wu Haiyan. Research on magnesium removal behavior of zinc hydrometallurgy [D]. Kunming University of Science and Technology, 2016]

At present, the commonly used magnesium removal methods at home and abroad include five categories: pretreatment removal method, fluoride chemical precipitation method, open circuit solution method, cooling crystallization method, solvent extraction method, etc., but the high value-added application of magnesium removed from zinc sulfate solution Less reported

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