Smelting method for removing fluorine and chlorine out of fluorine-and-chlorine-containing inferior zinc oxide and enriching valuable metals

The technology of a valuable metal and a smelting method is applied in the smelting and fluorine-containing fields of zinc chlorohypoxide defluorination and enrichment of valuable metals, and can solve the problems of high investment and technical transformation cost, large pollution, and inability to unify technologies. To achieve the effect of reducing investment and technological transformation costs, reducing production costs and improving economic benefits

Inactive Publication Date: 2014-07-16
何宇波
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the actual production process, the usual method of removing fluorine and chlorine is: multiple times of water washing, heating and alkali washing of sub-zinc oxide, combined with ion exchange depth to remove chlorine, and then entering the traditional hydrometallurgy process to produce zinc metal, resulting in A large amount of washing to remove fluoride and chloride ion water not only consumes a lot of water per ton of zinc metal, but also has a large amount of sewage treatment and discharge, and the production cost is also high
Moreover, the fluorine, chlorine and other impurities in secondary zinc oxide change complexly, and almost every source and every batch is different, resulting in a complicated production process, and it is impossible to unify a treatment process, and the technology and even the equipment must be based on the raw materials adjust accordingly
Therefore, for many years, enterprises that use secondary zinc oxide to smelt zinc have a series of problems such as low production efficiency, heavy pollution, high investment and technical transformation costs, high equipment loss, high energy consumption, and inability to unify technologies.
This leads to the inability to fully utilize secondary zinc oxide from a wide range of sources, which restricts the technological improvement and industrial upgrading of the zinc smelting industry

Method used

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  • Smelting method for removing fluorine and chlorine out of fluorine-and-chlorine-containing inferior zinc oxide and enriching valuable metals
  • Smelting method for removing fluorine and chlorine out of fluorine-and-chlorine-containing inferior zinc oxide and enriching valuable metals

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Experimental program
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Effect test

Embodiment 1

[0047] Trial production is a 1:1 mixture of zinc-containing leaching slag, water-quenching slag, and steel plant gas mud used in a factory with coke powder, and a 1:1 mixture of sub-zinc oxide produced by the Wiltz method and zinc ash from a steel plant. It is still called secondary zinc oxide, and its main chemical composition is shown in Table 1:

[0048] Table 1 Main chemical components of secondary zinc oxide

[0049] element F% Cl% Zn% Bi% Pb% S% H2O% In g / T content 0.15 6.51 46.56 1.75 12.3 2.27 2.1 725 element Co% Ni% Zn% soluble Sn% Cu% Sb% Fe% Ag g / T content 0.003 0.0015 89.8 2.14 0.08 1.52 2.32 77

[0050] Use a coal tar burner to heat the Ф2.1m x 32m rotary kiln, and at the same time turn on the circulating spray water system, control the air volume of the induced draft fan at the tail of the spray system, and maintain the rotary kiln in a slightly negative pressure state. When the temperatur...

Embodiment 2

[0072] The 1:1 mixture of zinc dust and dust collection dust produced by the electroplating factory and alloy factory for trial production is still called secondary zinc oxide after synthesis. Its main chemical composition is shown in Table 10:

[0073] Table 10 main chemical components of zinc oxide

[0074] element F% Cl% Zn% Bi% Pb% S% H2O% In g / T content 0.35 3.51 56.12 0.01 1.3 0.22 1.55 -- element Co% Ni% Zn% soluble Sn% Cu% Sb% Fe% Ag g / T content 0.22 0.13 92.8 0.07 0.01 0.01 5.32 --

[0075] Use a coal tar burner to heat the Ф2.1m x 32m rotary kiln, and at the same time turn on the circulating spray water system, control the air volume of the induced draft fan at the tail of the spray system, and maintain the rotary kiln in a slightly negative pressure state. When the temperature of the kiln head rises to ≥1200°C, and the temperature of the kiln tail is ≥300°C; at this time, spray and humidify t...

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Abstract

The invention discloses a smelting method of removing fluorine and chlorine out of fluorine-and-chlorine-containing inferior zinc oxide and enriching valuable metals and relates to the technical field of hydrometallurgy and thermometallurgy of nonferrous metals such as zinc. The method disclosed by the invention comprises the following steps: oxidizing and roasting inferior zinc oxide in a rotary kiln at a high temperature so as to remove fluorine and chlorine and generate high-purity zinc oxide particles; meanwhile, volatilizing valuable metals in form of high-temperature soot and smoke, circularly spraying and washing so that valuable metals enter a spraying solution or precipitate to be enriched; further separating valuable metals in the solution; and finally, treating the sewage containing fluorine and chlorine and discharging the sewage reaching the standard or reusing the sewage by the system. Therefore, the inferior zinc oxide is purified in a primary continuous multi-sectional process to reach the technical index of conventional zinc-making raw materials, and the valuable metals are enriched by 5-20 times. The zinc making enterprises can widely use various types of inferior zinc oxide as the raw material, so that the production process is unified, the production cost is lowered, various valuable metals are comprehensively recovered, and discharge of sewage is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy and pyrometallurgy of non-ferrous metals such as zinc, in particular to a smelting method for defluorinating and chlorinating zinc oxide containing fluorine and chlorine and enriching valuable metals. Background technique [0002] The fluorine-containing and chlorine-containing subzinc oxide referred to in the present invention refers to all oxides containing zinc in a broad sense, hereinafter collectively referred to as subzinc oxide, which is produced by roasting zinc-containing smelting waste residues in reduction kilns such as rotary kilns, fuming furnaces, and blast furnaces. Soot ash; dust collection zinc ash in iron ore smelting blast furnace, sintering and other processes; waste iron and steel recycling dust collection; dust collection zinc ash produced by thermoelectric galvanizing and zinc alloy, etc. [0003] In recent years, a large number of domestic zinc smelting and producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30
CPCY02P10/20
Inventor 何宇波
Owner 何宇波
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