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High value-added greening comprehensive utilization method for medium and low-grade zinc oxide ores

A technology for comprehensive utilization of zinc oxide ore, applied to chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve problems such as single product structure, large consumption of sulfuric acid, low zinc content in leachate, etc., and achieve simple process flow, The effect of simple equipment and low cost

Inactive Publication Date: 2010-06-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] 1) There is a certain amount of silicon in zinc oxide ore, and acid leaching is not easy to desiliconize
[0015] 2) The zinc content in the leach solution is low, the amount of leaching neutralization residue is large, and the solution balance is difficult to control
[0016] 3) The consumption of sulfuric acid is large, and 1 ton of zinc consumes more than 1 ton of acid, which is more than 5 times the acid consumption of zinc sulfide ore
However, there are problems such as high energy consumption in the ammonia distillation process, serious scarring in the ammonia distillation tower and no good solution, and a single product structure.

Method used

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  • High value-added greening comprehensive utilization method for medium and low-grade zinc oxide ores

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The composition of zinc oxide ore used is: Zn 28.3%, Fe 2.6%, CaO 1.72%, Pb 3.01%, Al 0.02%, and Cu 0.01%. Zinc exists mainly as smithsonite in minerals.

[0046] The zinc oxide ore is crushed, pulverized to less than 80μm, calcined at 900°C for 3h, and mixed evenly with the ammonium sulfate solution. Among them, the molar ratio of zinc oxide to ammonium sulfate in the ore is 1:3, and the concentration of ammonium sulfate is 40%. Dry and dehydrate for 2 hours below 200°C, then heat up to 500°C for roasting, keep it for 2 hours, and carry out roasting reaction. The roasted product is cooled, dissolved in water, and then subjected to solid-liquid separation. The filtrate is zinc sulfate, iron sulfate and ferrous sulfate, and the filter residue is silica, ferric oxide, etc.

[0047] The filtrate is impurity-removed by the yellow ammonium iron vitriol method to obtain the zinc sulfate refined solution and then electrolyzed. The cathode sheet prepared by the electrowinning wil...

Embodiment 2

[0052] The composition of zinc oxide ore used is: Zn 18.81%, Fe 4.67%, Pb 0.95%, S 2.04%, SiO 2 44.99%, Al 2 O 3 4.16%, CaO 10.54%, MgO 0.48%. Zinc mainly exists in minerals as hemimorphite and willemite.

[0053] The zinc oxide ore is crushed, pulverized to less than 80 μm, and mixed evenly with the ammonium sulfate solution. Among them, the molar ratio of zinc oxide to ammonium sulfate in the ore is 1:4, and the concentration of ammonium sulfate is 38%. Dry and dehydrate for 2 hours below 200°C, then heat up to 400°C for roasting, keep it for 3 hours, and carry out roasting reaction. The roasted product is cooled, dissolved in water, and then subjected to solid-liquid separation. The filtrate is zinc sulfate, iron sulfate and ferrous sulfate, and the filter residue is silica, ferric oxide, and calcium sulfate.

[0054] The filtrate is impurity-removed by the yellow ammonium iron vitriol method to obtain the zinc sulfate refined solution and then electrolyzed. The cathode she...

Embodiment 3

[0059] The composition of zinc oxide ore used is: Zn 11.43%, Fe 16.18%, SiO 2 27.98%, Al 2 O 3 6.18%, CaO 7.52%, MgO 0.17%, Pb 0.68%, Mn 1.76%. Zinc mainly exists as heteropolar ore in minerals.

[0060] The zinc oxide ore is crushed, pulverized to less than 80 μm, and mixed evenly with the ammonium sulfate solution. Among them, the molar ratio of zinc oxide to ammonium sulfate in the ore is 1:6, and the concentration of concentrated ammonium sulfate is 40%. Then it is dried and dehydrated below 150°C for 3 hours, then heated to 450°C for roasting, and kept for 2 hours for roasting reaction. The roasted product is cooled, dissolved in water, and then subjected to solid-liquid separation. The filtrate is zinc sulfate, iron sulfate and ferrous sulfate, and the filter residue is silicon dioxide, ferric oxide and calcium sulfate.

[0061] The filtrate is impurity-removed by the yellow ammonium iron vitriol method to obtain the zinc sulfate refined solution and then electrolyzed. T...

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Abstract

The invention discloses a high value-added greening comprehensive utilization method for medium and low-grade zinc oxide ores (mainly comprising willemite, hemimorphite and calamine). The method comprises the following steps: (1) crushing and grinding the zinc oxide ores, then mixing the ground zinc oxide ores and ammonium sulfate solution, and drying, dehydrating and roasting the mixture (the calamine needs to be calcined before mixing); (2) dissolving the roasted product in water, filtering the solution, and then removing impurities by an ammoniojarosite method to obtain zinc sulfate refining solution; (3) electrodepositing the zinc sulfate refining solution to prepare zinc, and introducing ammonia into the electrodepositing waste solution to prepare ammonium sulfate for reclaiming; and (4) treating the filter residue (mainly containing oxides of silicon and iron) by alkali to prepare a silicon oxide product, and using the residue as an iron-making raw material or deeply processing the residue into a high value-added product. The method is suitable for treating various medium and low-grade zinc oxide ores, has simple process flow and simple and convenient equipment, has no waste emission of solid, liquid and gas so as not to cause secondary pollution, and realize high value-added greening comprehensive utilization of the medium and low-grade zinc oxide ore resources with lower cost.

Description

Technical field [0001] The invention relates to a method for the green comprehensive utilization of zinc oxide ore with high added value, in particular to the comprehensive utilization of heteropolar ore, siderite and willemite. Background technique [0002] With the increasing world demand for zinc and the continuous development and consumption of zinc sulfide mineral resources, how to develop and utilize zinc oxide mineral resources becomes more and more important. Most zinc ore in nature exists in the form of zinc sulfide. Zinc oxide ore is a secondary ore of zinc. It is an important type of zinc-bearing minerals. The main zinc ore (ZnCO 3 ), Hemimorphite (Zn 4 (Si 2 O 7 )(OH) 2 ·H 2 O) and willemite (Zn 2 SiO 4 ) And other forms exist. It contains a lot of metal impurities, such as lead, iron, cadmium, copper and so on. The gangue minerals are mainly calcite, dolomite, quartz, clay, iron oxide and iron hydroxide. Zinc oxide ore is distributed in many countries in the world...

Claims

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Application Information

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IPC IPC(8): C01C1/24C01C1/02C01B31/20C01F11/02C01G49/02C01B33/12C01D1/04C22B19/02C25C1/16C01B32/50
CPCY02P10/20
Inventor 翟玉春吴艳顾惠敏申晓毅孙毅
Owner NORTHEASTERN UNIV
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