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Comprehensive zinc sulfate slag recycling treatment method

A zinc sulfite, recycling technology, applied in the fields of sulfur compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of deteriorating operating environment, increasing environmental protection risks, large investment and other problems, achieving easy control, uniform and stable production capacity, The effect of uniform and stable concentration

Inactive Publication Date: 2019-01-08
YUNNAN LUOPING ZINC & ELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly the following methods for the treatment of zinc sulfite: 1. Concentrated analysis of zinc sulfite with dilute sulfuric acid. Zinc sulfate slurry solution recovered with other valuable metals, but this method requires new analysis equipment and acid system, which requires a large investment, and a part of sulfur dioxide overflows from the analysis tank, which deteriorates the operating environment, and more importantly, during the analysis process , because it is difficult to control the uniformity and balance of the input of zinc sulfite and the addition of dilute sulfuric acid, it is generally operated intermittently, so the concentration of sulfur dioxide gas generated fluctuates in a large range, the control of the acid system is difficult, and the quality of the produced sulfuric acid is unstable, making the acid It is difficult to meet the exhaust emission standards of the system and increase the environmental risk
2. Slurry zinc sulfite first, control a certain temperature, let in air and add a certain amount of auxiliary oxidant to oxidize. During the process, use dilute sulfuric acid to adjust the pH of the solution in a stable range. The main principle is that zinc sulfite and Oxygen undergoes an oxidation reaction to generate zinc sulfate; this method also requires new oxidation equipment, which requires a large investment; and in the process of acid adjustment to keep the pH value of the pulp solution stable, the local acidity makes a part of zinc sulfite and dilute sulfuric acid react to generate sulfur dioxide gas overflow Deteriorating the operating environment and increasing environmental risks

Method used

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  • Comprehensive zinc sulfate slag recycling treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 200 tons of zinc sulfite slag produced by our company and mix it evenly for later use, and then take 600 tons of zinc concentrate produced by our company and mix it evenly for later use; the main components of the zinc sulfite slag are 35.26wt% zinc and 10.02wt% sulfur %, lead 4.53wt%, fluorine 0.16wt%, chlorine 0.12wt%, water 28.47wt%, sulfite 96.37wt%; the main components of zinc concentrate contain zinc 45.27wt%, sulfur 30.03wt%, water 10.12 wt%, lead 1.02wt%, fluorine 0.021wt%, chlorine 0.032wt%, trace amount of sulfite.

[0034]1. Drying of zinc sulfite slag: Dry the uniformly mixed zinc sulfite slag in a drying kiln. During the drying process, the material is uniformly fed and not blocked. tons, and produce zinc sulfite dry material with a moisture content of 8-10wt%.

[0035] 2. Drying of zinc concentrate: Dry the uniformly mixed zinc concentrate in a drying kiln. During the drying process, the feeding is controlled evenly without clogging. The temperature ...

Embodiment 2

[0046] Take 350 tons of zinc sulfite slag produced by our company and mix it evenly for later use, and then take 800 tons of zinc concentrate produced by our company and mix it evenly for later use; the main components of the zinc sulfite slag are 44.92wt% zinc and 15.01wt% sulfur %, lead 5.49wt%, fluorine 0.24wt%, chlorine 0.21wt%, water 29.68wt%, sulfite 97.97wt%; the main components of zinc concentrate contain zinc 54.86wt%, sulfur 34.73wt%, water 14.96 wt%, lead 1.47wt%, fluorine 0.029wt%, chlorine 0.038wt%, trace amount of sulfite.

[0047] 1. Drying of zinc sulfite: Dry the uniformly mixed zinc sulfite slag in a drying kiln. During the drying process, the material is uniformly cut and not blocked. The temperature of the entire drying process is 100-150 °C, and the drying rate is 10-15 tons per hour. , to produce zinc sulfite dry material with a water content of 8~10wt%.

[0048] 2. Drying of zinc concentrate: Dry the uniformly mixed zinc concentrate in a drying kiln. Du...

Embodiment 3

[0059] A method for comprehensive recovery and treatment of zinc sulfite slag, comprising the following steps:

[0060] 1) Drying and crushing of zinc sulfite slag: take the zinc sulfite slag to be treated, dry and dehydrate it at 100°C so that the water content does not exceed 10wt%, and obtain a dry material of zinc sulfite slag; The zinc slag dry material is crushed, and the zinc sulfite slag fine material with a particle size of 100wt% over 60 meshes is produced for subsequent use; the main components of the zinc sulfite slag produced by absorbing sulfur dioxide flue gas are: zinc 35wt%, sulfur 10wt%, lead 4.5wt%, sulfite 96wt%, fluorine 0.15wt%, chlorine 0.1wt%, water 25wt%;

[0061] 2) Drying and crushing of zinc concentrate: Take the zinc concentrate and dry and dehydrate it at a temperature of 200°C so that the moisture contained in it does not exceed 10wt%, to obtain a dry zinc concentrate; then crush the dry zinc concentrate, The zinc concentrate fine material whose...

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Abstract

The invention discloses a comprehensive zinc sulfate slag recycling treatment method. The method comprises processes of drying, crushing, mixing, boiling, roasting and the like for zinc sulfate slag;the zinc sulfate slag is turned into a raw material for wet zinc refining to obtain zinc roasted ores with zinc oxide serving as a main component. The method specifically comprises the following steps: drying and crushing the zinc sulfate slag at first, then uniformly mixing the zinc sulfate slag with zinc concentrates according to a certain ratio, and finally boiling and roasting the mixed material by adopting a boiling furnace to produce the zinc roasted ores for wet zinc refining and sulfur dioxide flue gas for acid production. According to the comprehensive zinc sulfate slag recycling treatment method, the zinc sulfate slag can be decomposed into the zinc oxide and the sulfur dioxide by using heat energy generated by the exothermic reaction of the zinc concentrates in the boiling and roasting process, so as to fulfill the aim of safe, environmentally-friendly and resource-integrating utilization of zinc sulfate.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for comprehensive recovery and treatment of zinc sulfite slag. Background technique [0002] Zinc leaching slag from hydrometallurgy and materials with low zinc content need comprehensive recovery and harmless treatment, generally using rotary kiln volatilization. Zinc and other valuable metals are volatilized, and zinc oxide dust, low-concentration sulfur dioxide flue gas, and water quenching slag are produced with zinc oxide as the main component. Due to the high fluorine and chlorine in the zinc oxide powder smoke, it is returned to the hydrometallurgy zinc production raw material after defluorination and chlorine in the multi-hearth furnace; After slurry adjustment, the ore is sprayed and absorbed to meet the standard discharge, and zinc sulfite slag is obtained at the same time; the produced water-quenched slag is magnetically separated to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B19/30C01B17/50C01B17/74
CPCC01B17/50C01B17/74C22B1/02C22B7/00C22B19/30Y02P10/20Y02P20/10Y02P20/129
Inventor 赵兵伍吴慧赵德军杨建兴李尤立陈长浩赵宝灿龙国心
Owner YUNNAN LUOPING ZINC & ELECTRICITY
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