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One-step zinc smelting method of molten pool spraying zinc concentrate

A technology of zinc concentrate and molten pool, which is applied in the field of one-step zinc smelting by spraying zinc concentrate in the molten pool, can solve the problems of complex process, high energy consumption, long technical process, etc., and achieve the effect of increasing the operating temperature and efficient and thorough volatilization

Active Publication Date: 2021-08-31
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is based on the inventor's discovery and understanding of the following facts and problems: the existing zinc-containing material treatment process has problems such as long technical process, complicated process, huge investment, high energy consumption, and difficulty in industrialization

Method used

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  • One-step zinc smelting method of molten pool spraying zinc concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Zinc sulfide concentrate (containing Zn: 50.1% by mass) and flux (FeO, SiO 2 and CaO) are mixed and dried, and the mixed material contains 3% (mass) water after drying. The mixed material and oxygen-containing gas are sprayed directly into the molten pool of the jet smelting area from the side blowing lance installed in the jet smelting area of ​​the jet smelting electrothermal reduction furnace. The smelting temperature in the jet smelting area is 1400°C for oxidative desulfurization of zinc sulfide concentrate Smelting to obtain flue gas and high zinc slag, wherein the oxygen volume concentration in the oxygen-containing gas is 40%, and the mixed material is transported in the spray gun with an oxygen-rich gas with an oxygen volume concentration of 25%. The flue gas produced in the jet smelting zone is cooled by the waste heat boiler, dust is collected by the electrostatic precipitator, and then the flue gas is sent to make acid.

[0040] The high-zinc slag enters th...

Embodiment 2

[0043] The method is the same as that of Example 1, except that the dried mixed material and oxygen-containing gas are directly sprayed into the molten pool of the jet smelting zone by the same side-blown lance provided in the jet smelting zone of the jet smelting electrothermal reduction furnace, and the innermost layer of the lance is The mixed material is sprayed into the channel, the oxygen-containing gas is sprayed into the sub-outer channel of the spray gun, and the outermost channel of the spray gun uses nitrogen and water to cool the gun body.

[0044] Table 1 shows the zinc content in the flue dust in the jet smelting zone, the zinc content in the slag in the electrothermal reduction zone, and the zinc direct recovery rate in the method of this embodiment.

Embodiment 3

[0046] The method is the same as in Example 2, except that the zinc sulfide concentrate particle size is 75 μm or less, accounting for 90%, the mixed material contains 1% (mass) of water after drying, and the oxygen volume concentration in the oxygen-containing gas in the jet smelting zone is 70%. The melting temperature in the jet melting zone is 1500°C, and the operating temperature in the electrothermal reduction zone is 1600°C.

[0047] Table 1 shows the zinc content in the flue dust in the jet smelting zone, the zinc content in the slag in the electrothermal reduction zone, and the zinc direct recovery rate in the method of this embodiment.

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Abstract

The invention discloses a one-step zinc smelting method of spraying zinc concentrate in a molten pool, which comprises the following steps: a. mixing the zinc concentrate with a flux and drying to obtain a mixed material; b. drying the mixed material obtained in the step a Spray directly into the molten pool of the jet smelting zone through the side blowing lance, react with oxygen-containing gas to oxidize and desulfurize, and obtain high-grade zinc slag and smelting flue gas; c, send the high-grade zinc slag obtained in step b into the electrothermal reduction zone for reduction to obtain Zinc vapor and slag. In the method of the present invention, by changing the feeding mode of the material, the mixed material is directly sprayed into the molten pool of the jet smelting zone by using a side-blown spray gun after drying, so that the zinc content in the flue gas in the smelting zone is significantly reduced, and the direct absorption of zinc is greatly improved. Yield, the zinc content of the slag obtained after reduction can be reduced to less than 0.1%. The slag yield is low and the amount of slag is small. It can be directly sold as general solid waste. The production capacity of a single series of zinc can meet the requirements of 5-50 million tons / year. kind of scale.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting, and in particular relates to a one-step zinc smelting method in which zinc concentrate is sprayed into a molten pool. Background technique [0002] Zinc metal is an important raw material for industry and agriculture. With the progress of society and the development of human beings, the world's demand for zinc resources is increasing rapidly, and the consumption of zinc raw materials is huge. my country is a big country producing zinc in the world, and our country produces almost 50% of zinc products with less than 20% of the world's zinc resource reserves. [0003] Zinc smelting is mainly based on wet process. Zinc concentrate is leached after roasting or other means to obtain zinc sulfate solution, which is purified and electrolytically deposited to obtain cathode zinc flakes, and zinc smelting and casting to obtain Zn99.995 zinc ingots. This process has many steps, complex process, hug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/00C22B5/16C22B13/02C21B11/10
CPCC21B11/10C22B5/16C22B13/02C22B19/00
Inventor 李东波黎敏邓兆磊尉克俭茹洪顺曹珂菲吴卫国许良宋言苟海鹏冯双杰李兵
Owner CHINA ENFI ENGINEERING CORPORATION
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