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A method for removing fluorine, chlorine and valuable metals in secondary zinc oxide

A technology of secondary zinc oxide and valuable metal, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of insufficient environmental protection and economy, energy saving and emission reduction, long and complicated process, large equipment loss, etc., and achieves low heat loss and process flow. Less, less corrosion loss effect

Active Publication Date: 2018-02-09
QUZHOU YESHENG METAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of lengthy and complex processes in the prior art, high cost, large loss of equipment, and insufficient environmental protection, economy, energy saving and emission reduction, the present invention provides a method for removing fluorine, chlorine and valuable metals in secondary zinc oxide , in the granulation process of secondary zinc oxide, only water is added without adding other treatment agents, and the corrosion loss to the rotary kiln is small; through the roasting process, the removal of fluorine and chlorine and the removal of valuable metals are completed in one fell swoop. Re-enrichment requires less process flow, high efficiency, greatly reduces costs, shortens time, and greatly improves environmental protection and economic benefits

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  • A method for removing fluorine, chlorine and valuable metals in secondary zinc oxide

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Effect test

Embodiment 1

[0055] An enterprise in Zhejiang uses high-zinc dust removal dust from steel mills as raw material for sub-zinc oxide, and the composition of each element of sub-zinc oxide is shown in Table 1:

[0056] Table 1 Elemental composition of secondary zinc oxide

[0057] Zn(wt%)

[0058] The above secondary zinc oxide is granulated, the particle size is 5mm, the weight ratio of the sum of the added water to the raw material secondary zinc oxide is 8:92, and the drying time is 2 days. The spherical material obtained by granulation is input into a rotary kiln (specification φ2.2×30m) for roasting. The heating device of the rotary kiln is a double-layer casing, the inner tube is a fuel channel, and the outer tube is an air channel. The fuel is natural gas , the natural gas supply pressure is 0.4MPa, the inlet pressure of the air fan supplying air to the outer pipe is 1500Pa, the kiln tail flue gas outlet temperature is 400°C, the kiln head temperature is 1000°C, the kiln tail...

Embodiment 2

[0071] An enterprise in Sichuan uses lean zinc oxide ore as raw material to produce secondary zinc oxide through the fuming method of a rotary kiln. The composition of each element of secondary zinc oxide is shown in Table 5:

[0072] Table 5 Elemental composition of secondary zinc oxide

[0073] Zn(wt%)

[0074] The above-mentioned secondary zinc oxide is granulated, the particle size is 5mm, the weight ratio of the sum of the added water to the raw material secondary zinc oxide is 9:91, and the drying time is 2 days. The spherical material obtained by granulation is input into a rotary kiln (specification φ2.2×34.5m) for roasting. The heating device of the rotary kiln is a double-layer casing, the inner tube is a fuel channel, and the outer tube is an air channel. The fuel is Natural gas, the gas supply pressure of natural gas is 0.4MPa, the inlet pressure of the air fan supplying air to the outer pipe is 1500Pa, the outlet temperature of the flue gas at the kiln t...

Embodiment 3

[0086] A certain enterprise uses lead-zinc ore smelting slag as raw material to process secondary zinc oxide. The composition of each element of secondary zinc oxide is shown in Table 9:

[0087] Table 9 Elemental Composition of Secondary Zinc Oxide

[0088] Zn(wt%)

[0089] The above-mentioned secondary zinc oxide is granulated, the particle size is 3mm, the weight ratio of the sum of added water to the raw material secondary zinc oxide is 7:93, and the drying time is 1 day. The spherical material obtained by granulation is input into a rotary kiln (specification φ2.2×30m) for roasting. The heating device of the rotary kiln is a double-layer casing, the inner tube is a fuel channel, and the outer tube is an air channel. The fuel is natural gas , the natural gas supply pressure is 0.2MPa, the inlet pressure of the air fan supplying air to the outer pipe is 1300Pa, the kiln tail flue gas outlet temperature is 350°C, the kiln head temperature is 950°C, the kiln tail fa...

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Abstract

The invention provides a method for removing fluorine, chlorine and valuable metals in sub-zinc oxide, which solves the problems of low removal rate, high energy consumption, unenvironmental and economical problems in the prior art. The method of the present invention uses high-fluorine chlorine suboxide zinc oxide as raw material, adopts granulation, air drying, rotary kiln roasting, flue gas through sedimentation, dust collection, calcination indirect water cooling process, natural gas as heat source, mixed air heating method, Fluorine, chlorine, lead, and indium are removed, and valuable metals such as indium and lead are re-enriched at the same time. The present invention removes most of fluorine, chlorine, lead, and indium in one fell swoop through the roasting process, enriches lead and indium in roasted dust, solves the problem of subsequent treatment of high-fluorine chlorine suboxide zinc oxide, and requires less technological process. It has the advantages of high efficiency, smooth process and high degree of mechanization, and the environmental protection and economic benefits have been greatly improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for removing fluorine, chlorine and valuable metals in secondary zinc oxide. More specifically, the method effectively removes fluorine, chlorine and valuable metals in the zinc suboxide by roasting the wet-granulated zinc suboxide in a rotary kiln, and at the same time realizes the re-enrichment of the valuable metals. Background technique [0002] Zinc is an important non-ferrous metal and plays an important role in the national economy. Widely used in galvanizing industry, material synthesis processing, battery, automobile, chemical industry, metallurgy and other industries. With the development of the economy, the application fields of zinc are constantly expanding, and the demand is also expanding. However, the supply of domestic zinc concentrate is limited. Therefore, some domestic enterprises have strengthened the recovery and utilization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02
Inventor 欧阳广曹明锋
Owner QUZHOU YESHENG METAL MATERIAL CO LTD
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