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Method for inhibiting generation of ferrous oxide in high iron zinc calcine reduction roasting process by utilizing partial pressure of CO2

A technology for ferrous oxide and high iron zinc is applied in the field of selective reduction and selective reduction of zinc ferrite in high iron zinc calcined sand, which can solve the problems of difficult recycling of iron slag, large amount of leaching slag, difficulty in separation of iron and zinc, etc. Easy roasting conditions, low equipment corrosion, and the effect of simplifying the zinc hydrometallurgy process

Inactive Publication Date: 2012-08-22
CENT SOUTH UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can make the decomposition rate of zinc ferrite reach more than 85%, and solve the problems of difficult separation of iron and zinc, large amount of leaching slag, and difficulty in resource utilization of iron slag in the process of zinc smelting.

Method used

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  • Method for inhibiting generation of ferrous oxide in high iron zinc calcine reduction roasting process by utilizing partial pressure of CO2
  • Method for inhibiting generation of ferrous oxide in high iron zinc calcine reduction roasting process by utilizing partial pressure of CO2
  • Method for inhibiting generation of ferrous oxide in high iron zinc calcine reduction roasting process by utilizing partial pressure of CO2

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Experimental program
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Effect test

Embodiment 1

[0023] Zinc ferrite is dried and then ground and sieved until particles with a particle size of less than 75 μm account for more than 95%. 2 Reduction roasting under the condition of 60min, 750℃, CO, Ar and CO 2 The mixed gas; where the CO concentration is 4%, CO / (CO+CO 2 ) is reduction roasting under 20% condition for 60min, and the flow rate of the mixed gas is controlled at 0.065L / g·min (the flow rate of the mixed gas refers to the volume of the mixed gas required per unit mass of zinc ferrite per unit time). The results show that the decomposition of zinc ferrite occurs during the reduction roasting process, but in the absence of CO 2 Under the roasting conditions, there is ferrous oxide generated, and CO 2 In the future, iron mainly exists in the phase form of magnetic ferroferric oxide. It can be seen that CO 2 The addition of avoids the Fe 3 o 4 +CO=FeO+CO 2 The occurrence of the reaction can effectively avoid subsequent leaching of a large amount of iron.

Embodiment 2

[0025] After the high-iron-zinc calcine pretreatment, respectively, at 750 ° C, CO concentration 4%, no CO 2 Under the conditions, reduction roasting 60min, 750℃, CO, Ar and CO 2 The mixed gas; where the CO concentration is 4%, CO / (CO+CO 2 ) is reduced and roasted for 60 minutes under the condition of 20%, and according to the zinc ferrite content, the flow rate of the mixed reducing gas is controlled to be 0.0176L / g min (the mixed gas flow rate refers to the required mixing rate of zinc ferrite per unit time in unit time). The volume of the gas in which the percentage of zinc ferrite α is 0.27). Fe was analyzed after reduction roasting 2+ / T Fe Variations over time such as image 3 shown. The results showed that the zinc ferrite in the high iron zinc calcine was decomposed during the reduction roasting process, and the zinc ferrite was transformed into zinc oxide and magnetic ferroferric oxide. without CO 2 Under the calcination conditions, zinc ferrite is over-reduced...

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Abstract

The invention provides a method for inhibiting generation of ferrous oxide in a high ferrum zinc calcine reduction roasting process by utilizing partial pressure of CO2. With adoption of the method, transformation of magnetic ferroferric oxide to ferrous oxide is inhibited in the reduction roasting process through controlling concentration of CO, partial pressure of CO / (CO+CO2), gas flow, roasting temperature and roasting time by adopting a high-temperature reduction roasting process and at the condition of a weak reducing atmosphere, thereby the ferrous dissolving amount in a follow-up wet method zinc galvanizing process is lowered, the iron precipitation burden of a zinc leaching liquid and the environmental problem brought by iron precipitation slag stockpiling are greatly lightened; and the method is beneficial for realizing that the zinc is cleaned and smelted.

Description

Technical field: [0001] The invention belongs to the intersecting field of metallurgical engineering and environmental engineering, specifically relates to a selective reduction method, in particular to a method for utilizing CO 2 A method for realizing the selective reduction of zinc ferrite in high-iron zinc calcine. Background technique: [0002] Zinc smelting methods in my country are currently dominated by wet methods, accounting for more than 85% of zinc production capacity. Today, the hydromethod zinc smelting process that has been used in large-scale industrial applications usually consists of four major processes: oxidation roasting, leaching, purification and electrowinning. Zinc sulfide concentrate is converted into zinc oxide calcine after high-temperature boiling oxidative roasting (900°C-1100°C), and the obtained calcine is subjected to neutral leaching or low-acid leaching to dissolve zinc, and the zinc-rich solution is purified and sent to electrolysis The p...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B19/00
Inventor 柴立元彭兵闫缓李密彭宁王纪明侯栋科
Owner CENT SOUTH UNIV
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