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A method for flash furnace cyclic enrichment and recovery of zinc powder in zinc-containing dust

A flash furnace and dust technology, which is applied in the field of metallurgy, can solve the problems of the influence of extraction purity and the consumption of large leaching agents, etc., and achieve the effect of improving leaching efficiency and purity, improving purity, and improving purity

Active Publication Date: 2022-02-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lower the zinc content in the zinc-containing dust, the lower the zinc oxide content in the coarse zinc oxide powder obtained by pyro-enrichment, which will contain a large amount of iron, lead and other metal oxides, calcium oxide, aluminum oxide, coal ash and other dust. When purifying by wet method, a large amount of leaching agent is still consumed, and the extraction purity will be greatly affected

Method used

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  • A method for flash furnace cyclic enrichment and recovery of zinc powder in zinc-containing dust
  • A method for flash furnace cyclic enrichment and recovery of zinc powder in zinc-containing dust
  • A method for flash furnace cyclic enrichment and recovery of zinc powder in zinc-containing dust

Examples

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Effect test

Embodiment 1

[0059] A method for cyclically enriching and recovering zinc powder in zinc-containing dust in a flash furnace, which involves cyclically enriching and recovering the zinc-containing dust produced in a blast furnace ironmaking in an ironworks, the recovery method comprising the following steps:

[0060] Table 1 The mass content of chemical components of zinc-containing dust

[0061]

[0062] S1. Take 1t of the above-mentioned zinc-containing dust, test its element content, as shown in Table 1, then calculate the theoretical demand of reducing agent during reduction smelting according to the following formula:

[0063] ZnO(s)+C(g)=Zn(g)+CO(g)

[0064] 3Fe 2 o 3 (s)+C(g)=2Fe 3 o 4 (s)+CO(g)

[0065] Fe 3 o 4 (s)+C(g)=3FeO(s)+CO(g)

[0066] FeO(s)+C(g)=Fe(s)+CO(g)

[0067] The quality of zinc oxide in 1t of this zinc-containing dust is 95.2kg, the quality of iron oxide is 205.5kg, and the quality of ferrous oxide is 130.8kg, which are converted into the amount of subs...

Embodiment 2

[0074] A method for cyclically enriching and recovering zinc powder in zinc-containing dust in a flash furnace, which involves cyclically enriching and recovering the zinc-containing dust produced by electric furnace ironmaking in a certain ironworks, and the recovery method includes the following steps:

[0075] Table 2 Mass content of chemical components of zinc-containing dust

[0076]

[0077] S1. Take 1t of the above-mentioned zinc-containing dust, test its element content, as shown in Table 2, then calculate the theoretical demand of reducing agent during reduction smelting according to the following formula:

[0078] ZnO(s)+C(g)=Zn(g)+CO(g)

[0079] 3Fe 2 o 3 (s)+C(g)=2Fe 3 o 4 (s)+CO(g)

[0080] Fe 3 o 4 (s)+C(g)=3FeO(s)+CO(g)

[0081] FeO(s)+C(g)=Fe(s)+CO(g)

[0082] The quality of zinc oxide in 1t of this zinc-containing dust is 89.9kg, the quality of iron oxide is 367.6kg, and the quality of ferrous oxide is 180.8kg, which are converted into the amount o...

Embodiment 3

[0089] Compared with Example 1, Example 3 differs in that the composition of the zinc-containing dust to be recovered is shown in Table 3, and the recovery and treatment steps are basically the same as those of Example 1, and will not be repeated here.

[0090] Table 3 Mass content of chemical components of zinc-containing dust

[0091]

[0092] After cyclic enrichment and recovery, the cyclic enrichment time when the content of zinc oxide in the obtained solid powder is ≥ 10% is about 80 minutes, which is longer than that of Example 1.

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Abstract

The invention provides a method for cyclically enriching and recovering zinc powder in zinc-containing dust in a flash furnace. First, by testing the element content in the zinc-containing dust, quantitatively calculate the theoretical demand of the reducing agent; then quantitatively put the zinc-containing dust and reducing agent into the flash furnace according to the calculation results, and carry out reduction smelting to obtain flue gas containing zinc vapor and melting Iron slag; when the flue gas encounters cold air, zinc vapor is oxidized to zinc oxide powder, the solid powder and gas in the flue gas are separated, and the solid powder is circulated and blown into the flash furnace, and the reducing agent is replenished as needed. When the zinc content in the solid powder is more than or equal to 10%, the solid powder is subjected to wet leaching to obtain a high-purity zinc product; the molten slag and iron are subjected to rapid cooling, pulverization and magnetic separation to obtain iron raw materials and cement raw materials. The invention improves the purity of the crude zinc oxide product through flash furnace cyclic enrichment and wet leaching, thereby reducing recovery energy consumption, cost and environmental pollution, and significantly improving the purity of recovered zinc.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for cyclically enriching and recovering zinc powder in zinc-containing dust in a flash furnace. Background technique [0002] Most iron ores contain harmful elements such as zinc and lead. During the ironmaking process, zinc and lead are reduced to gaseous simple substances at high temperatures, and are carried out of the furnace together with ore, coke, flux and other dust along with the flue gas. , the elemental substance in the gas form is oxidized to zinc oxide and lead oxide when it encounters air, and then it is collected by a dust removal and purification device to obtain zinc-containing dust. If this kind of zinc-containing dust is not properly disposed of, it will occupy a large amount of land, and will also cause a waste of valuable metal resources, and will also bring safety hazards to the environment. Therefore, it is of great significance to enrich and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/30C22B7/00C22B5/10C22B19/34C22B19/20
CPCC22B19/34C22B19/30C22B7/001C22B5/10C22B7/007C22B19/22Y02P10/20
Inventor 张建良徐润生刘征建王广伟
Owner UNIV OF SCI & TECH BEIJING