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

A secondary zinc oxide and valuable metal technology, 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, and large equipment loss, etc., and achieve small heat loss and smooth process flow The effect of less corrosion loss

Active Publication Date: 2015-07-15
QUZHOU YESHENG METAL MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • 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 secondary zinc oxide, which solves the problems of low removal rate, high energy consumption, low environment friendliness and low economical efficiency in the prior art. According to the method, high-fluoride/chloride secondary zinc oxide used as a raw material is granulated, aired and subjected to rotary kiln roasting, flue gas is settled and subjected to dust collection, the roasted product is subjected to indirect water cooling, and a mixed air heating process is adopted by using natural gas as a heat source, thereby removing the fluorine, chlorine, lead and indium and implementing reenrichment of indium, lead and other valuable metals. The roasting process is utilized to remove most of fluorine, chlorine, lead and indium; the lead and indium are enriched in the roasted dust, thereby solving the problem of later processing of the high-fluoride/chloride secondary zinc oxide; and the method has the advantages of fewer required technical processes, high efficiency, smooth procedure, high degree of mechanization and the like, and greatly enhances the environmental and economic benefits.

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 Applications(China)
IPC IPC(8): C01G9/02
Inventor 欧阳广曹明锋
Owner QUZHOU YESHENG METAL MATERIAL CO LTD
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