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A technology of leaching and leaching solution, applied in the field of leaching of zinc replacement slag, can solve the problems of low leaching rate of valuable metals, dispersion of valuable metals, and high cost of construction, and achieves the advantages of reducing leaching difficulty, high leaching rate, and reducing treatment costs. Effect
Active Publication Date: 2018-05-18
SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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[0004] The treatment of zinc replacement slag usually adopts the method of pyrolysis or wet leaching. The pyrolysis method is to send the replacement slag to rotary kiln, side blowing furnace and other equipment for high temperature treatment to volatilize valuable metals, and then use sulfuric acid to detoxify the smoke and dust. Although the process of leaching and cremation volatilization is simple, it has great environmental pollution, high energy consumption, and the dispersion of valuable metals. It requires the construction of supporting environmental protection facilities, etc., and the cost is high. The wet treatment mostly uses a one-stage sulfuric acid leaching process. This process can be As a part of the hydrometallurgy system, the system is complementary and environmentally friendly, but the leaching rate of valuable metals is usually not high because the high silicon in the replacement slag causes difficulties in the separation of metal germanium, etc.
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Embodiment 1
[0041] Such as figure 1 As shown, in this embodiment, the zinc replacement slag is leached, and the zinc replacement slag contains 0.45% gallium, 0.45% germanium, 0.1% indium, 8% copper, 16.9% zinc, 3% iron, dioxide Silicon 10.3%, the specific steps are as follows:
[0042] (1) Pretreatment: bake the zinc-substituted slag in an oxygen-containing atmosphere at a temperature of 300° C. for 2 hours. After baking, use a grinder to grind to a particle size of 200 mesh for later use.
[0043] (2) One-stage leaching: For every 1 kg of pretreated zinc replacement slag, use 3 liters of a solution containing 100g / L sulfuric acid or the second-stage leaching solution for slurrying. Then pump the slurried slurry into the oxygen autoclave for leaching, and the oxygen flow rate in the oxygen autoclave is 20-120Nm 3 / h, the pressure in the kettle is 0.2Mpa, the leaching temperature is 80°C, and the leaching time is 2 hours. Then the leaching slurry is separated from solid to liquid to obt...
Embodiment 2
[0048] Such as figure 1 As shown, in this embodiment, the zinc replacement slag is leached, and the zinc replacement slag contains 0.55% gallium, 0.26% germanium, 0.6% indium, 6% copper, 19.5% zinc, 5% iron, dioxide Silicon 11.3%, the specific steps are as follows:
[0049] (1) Pretreatment: bake the zinc-substituted slag in an oxygen-containing atmosphere at a temperature of 500° C. for 4 hours. After baking, use a grinder to grind the slag to a particle size of 200 mesh for later use.
[0050] (2) One-stage leaching: Slurry with 4 liters of solution containing 140g / L sulfuric acid or two-stage leaching solution for every 1 kg of pretreated zinc replacement slag. Then pump the slurried slurry into the oxygen autoclave for leaching, and the oxygen flow rate in the oxygen autoclave is 20-120Nm 3 / h, the pressure in the kettle is 0.2Mpa, the leaching temperature is 80°C, and the leaching time is 2 hours. Then the leaching slurry is separated from solid to liquid to obtain a s...
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Abstract
The invention relates to a leaching method of zinc replacement slag. The method comprises the following steps that a first-section leaching is carried out, namely slurring is carried out on a solutioncontaining 40-140g/L of sulfuric acid and the zinc replacement slag, oxygen pressure is leached after slurrying is carried out, then solid-liquid separation is carried out to obtain a first-section leachate and a first-section leached slag, and the first-section leachate is used for recovering valuable metal; second-section leaching is carried out, namely, slurrying is carried out on a solution containing 120-180g/L of sulfuric acid and the first-section leaching slag, oxygen pressure is leached after slurrying is carried out, then solid-liquid separation is carried out to obtain a second-section leachate and second-section leached slag, and the second-section leachate is returned to the first-section leaching to be used for slurring; and a third-section leaching is carried out, namely, slurrying is carried out on a sulfuric acid solution with the density of 140g-250g/L and the two-section leaching slag for stirring and leaching after slurrying is carried out, then solid-liquid separation is carried out to obtain a three-section leachate and three-section leaching slag, and the three-section leachate is returned to the two-section leaching to be used for slurrying. The leaching method of the zinc replacement slag has the advantages of being high in leaching rate, small in environment pollution, capable of achieving recycling use of the leachate and low in treatment cost.
Description
technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for leaching zinc replacement slag. Background technique [0002] At present, zinc hydrometallurgy mainly includes conventional leaching and oxygen pressure leaching. Among them, the oxygen pressure leaching process is widely used in various sulfide mixed ores due to its advantages such as high zinc leaching rate, simple process, low investment, environmental friendliness, and high degree of comprehensive recovery and utilization of associated metals. [0003] The oxygen pressure leaching process of zinc concentrate is to carry out acid leaching of pulp under certain temperature and oxygen partial pressure conditions. Valence metals are precipitated and enriched to form zinc replacement slag with high added value. Zinc replacement slag is generally rich in valuable metals gallium 0.2-0.7%, germanium 0.1-0.8%, indium 0.01-0.2%, copper 5-15%, zinc 5-2...
Claims
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