Method for utilizing magnesium resource in wet zinc smelting process

Abstract

The patent discloses a method for utilizing magnesium resources in a wet zinc smelting process. The method comprises the steps of adding magnesium fluoride seed crystals and zinc fluoride to a magnesium-containing zinc sulfate solution to obtain coarse grains crystals of a magnesium fluoride precipitate, and conducting liquid-solid separation; adding concentrated sulfuric acid to the magnesium fluoride precipitate to obtain hydrogen fluoride gas and magnesium sulfate; introducing the hydrogen fluoride into a container containing zinc oxide soot to obtain zinc fluoride; adding a catalyst and anatmosphere regulating agent to the magnesium sulfate, and conducting heating and decomposing to obtain magnesium oxide; and adding magnesium sulfate, an an organic admixture, an inorganic admixture,a reinforcing agent and short fiber to the magnesium oxide, and conducting uniform mixing, so as to obtain magnesium oxysulfate cement. Compared with the prior art, the method has the advantages of low production cost, 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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