Method for separating zinc and iron from zinc leaching residues
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A zinc leaching slag and leaching technology, applied in the field of metallurgy, can solve the problems of good comprehensive utilization effect of raw materials, high equipment material requirements, large investment costs, etc., and achieve the effects of low production labor intensity, shortening leaching time, and improving production rate.
Inactive Publication Date: 2014-12-03
CENT SOUTH UNIV
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The yellow potash iron vanadium method has the characteristics of simple process and low production cost, but the amount of slag produced by this method is large, and a separate site needs to be built. At the same time, the slag contains toxic elements such as As and Pb, which is easy to cause environmental pollution; the goethite method The amount of slag is about 60% of that of the yellow potassium iron vanadium method, but the process is complicated and the investment cost is relatively high; the metal recovery rate of the hematite method is high, and the effect of comprehensive utilization of raw materials is good. The main disadvantage is that the equipment material requirements are high , High investment cost (Peng Rongqiu. Lead-Zinc Metallurgy. Beijing, Science Press, 2003)
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Embodiment 1
[0023] The main components of zinc leaching slag are calculated in mass percentage (%): Zn 18.57%, Fe 21.74%, SiO 2 12.96%. Industrial grade ammonium sulfate, of which nitrogen content ≥ 20.5%, moisture ≤ 1.0%; industrial grade sulfuric acid, of which H 2 SO 4 ≥98%; industrial grade hydrogen peroxide, of which H 2 o 2 ≥35%; industrial grade anhydrous calcium sulfate, of which CaSO 4 ≥98%.
[0024] Weigh 100g of zinc leaching slag, mix it evenly with 90g of ammonium sulfate and 3g of calcium sulfate, put it into the furnace, and roast it at 600°C for 2 hours. 3 48%, N 2 15%, SO 2 30%.
[0025] Cool 108.2g of the roasted product obtained after roasting, put it in 400mL of sulfuric acid solution with a concentration of 0.00005mol / L for slurrying, react at a temperature of 25°C for 1 hour, filter, wash and dry to obtain 53.8g of leaching residue, the main Composition: Zn 0.39%, Fe 40.29%, SiO 2 24.09%; the obtained zinc-containing leachate was 392mL, and its main co...
Embodiment 2
[0028] The main components of zinc leaching slag are calculated in mass percentage (%): Zn 21.40%, Fe 23.56%, SiO 2 10.38%. Industrial grade ammonium sulfate, of which nitrogen content ≥ 20.5%, moisture ≤ 1.0%; industrial grade sulfuric acid, of which H 2 SO 4 ≥98%; industrial grade hydrogen peroxide, of which H 2 o 2 ≥35%; technical grade anhydrous magnesium sulfate, of which MgSO 4 ≥98%.
[0029] Weigh 100g of zinc leaching slag, mix it with 42g of ammonium sulfate and 2g of magnesium sulfate, put it into the furnace, and roast it at 500°C for 3 hours. 3 60%, N 2 10%, SO 2 twenty two%.
[0030] Cool 102.4 g of the roasted product obtained after roasting, put it in 400 mL of sulfuric acid solution with a concentration of 0.30 mol / L for slurrying, react at a temperature of 25 ° C for 1 hour, filter, wash, and dry to obtain 53.0 g of leaching residue. Composition: Zn 1.06%, Fe 44.35%, SiO 2 19.58%; the obtained zinc-containing leachate was 396mL, and its main com...
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Abstract
The invention discloses a method for separating zinc and iron from zinc leaching residues. The method comprises the following steps: firstly, mixing the zinc leaching residues with ammonium sulfate and an additive, then performing roasting to ensure that zinc ferrite and the like in the zinc leaching residues are changed into soluble zinc sulfate and insoluble ferric oxide; secondly, directly leaching out a roasted product by using a dilute sulfuric acid solution; and finally, introducing fume which is produced during roasting and mainly contains ammonia gas into a zinc leaching solution to perform deposition so as to produce zinc hydroxide and an ammonium sulfate solution, and concentrating and crystallizing the ammonium sulfate solution to prepare ammonium sulfate which is returned to the ammonium sulfate roasting process. The ammonium sulfate roasting process in the method can ensure that a zinc ferrite phase in the zinc leaching residues is changed into soluble zinc sulfate, the leaching rate of zinc is more than 97%, and the leaching rate of iron is lower than 2%, so that the separation of zinc and iron is effectively realized; the ammonia gas produced in the ammonium sulfate roasting process is directly used for depositing zinc from the leaching solution, and the regeneration of ammonium sulfate can be realized while a zinc hydroxide product is generated; the comprehensive recovery rate of zinc is more than 96%; the method can realize closed-loop circulation and is relatively environment-friendly.
Description
technical field [0001] The invention relates to pyrometallurgy and hydrometallurgy processes in the field of metallurgy, in particular to a method for effectively separating zinc and iron in zinc leaching slag. Background technique [0002] Zinc sulfide concentrate is boiled and roasted to produce zinc calcine, which is directly leached using dilute sulfuric acid solution as a solvent. The zinc existing in the zinc oxide phase is dissolved during the leaching process, and the remaining zinc is retained in the slag, which is often called zinc leaching slag. . The undissolved zinc content in the zinc leaching slag is generally about 20%. Since the contained zinc mainly exists in the form of zinc ferrite, it is difficult to leaching in the conventional dilute sulfuric acid leaching process. Therefore, reduction volatilization is usually used in industry. treatment process or hot acid leaching process. [0003] The reduction and volatilization treatment process is to mix the z...
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