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Method for reclaiming valuable element from zinc kiln slag

A technology for valuable elements and kiln slag, applied in the field of recovering valuable elements, can solve the problems of waste of resources, corrosion of chloride salt treatment equipment, unsatisfactory zinc volatilization index, etc. The effect of subsequent processing

Inactive Publication Date: 2008-02-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc kiln slag contains valuable metal elements such as iron, zinc, copper and silver, and contains a certain amount of carbon. However, due to its complex phase and difficult to recycle, it is discarded and stockpiled or sold at a low price, resulting in waste of resources and environmental pollution.
There is known document report, only adopts the mode recovery carbon of magnetic separation or winnowing; Vulcanizing agent (chemical formula is CuFeS 2 ) using vulcanization technology to process zinc kiln slag, which can reclaim valuable elements in zinc kiln slag, but the sulfur dioxide produced in the process will deteriorate the treatment environment; in known documents (Zhou Hongwu, Xu Ziping. Silver recovery in China. Non-ferrous metals (smelting part), 1991 (6)) discloses the use of molten pool smelting method to reclaim valuable elements in zinc kiln slag, the recovery rate of rare metals is only about 40wt%, and there are also follow-up treatments and sulfur dioxide pollution Environmental problems; In the known literature (Liu Zhihong, Wen Jian, Li Yuhu, etc. The research on the comprehensive recovery of valuable metals from Fankou kiln slag by melting chlorination volatilization process. Non-ferrous metals (smelting part), 2005 (3)) discloses the use of Fusion chlorination method recovers valuable elements in zinc kiln slag from flue dust. The volatilization rate of zinc and copper is low, and the volatilization index of zinc is not ideal. There are also problems such as large amount of flue dust, flue dust pollutes the environment, and chlorine salts corrode processing equipment.

Method used

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  • Method for reclaiming valuable element from zinc kiln slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The weight percent of the main chemical components of the raw material zinc kiln slag is TFe 31.36wt%, Zn 4.57wt%, Cu 0.77wt%, Pb 0.48wt%, C 15wt%, the particle size is ground to -0.074mm, accounting for 50-75wt%, high temperature melting The process conditions are: composite additive CaF 2 :CaO:SiO 2 =1:1:1 Addition amount 5wt%, adding coke 10wt%, smelting time 60min, smelting temperature 1300±50°C, the yield of metal phase iron obtained by smelting is 28wt%, the recovery rate of iron is 92.5wt%, copper The recovery rate is 98.5wt%. The metallographic structure analysis of iron is shown in Figure 1, which belongs to cast iron; the corresponding slag phase chemical composition: TFe is 3.76wt%, Cu≤0.001wt%, Pb≤0.019wt%, Zn≤0.001wt%, SiO 2 is 34.95wt%, and CaO is 16.18wt%; the content of Zn in the dust is ≥ 90wt%, and the content of Pb is ≥ 89wt%.

example 2

[0019] The weight percent of the main chemical components of the raw material zinc kiln slag is TFe32.82wt%, Zn5.29wt%, Pb0.60wt%, Cu0.91wt%, C18wt%; the particle size is ground to -0.074mm, accounting for 50-75wt%; the composite additive CaF 2 , CaO and SiO 2 Adding amount is 15wt%, adding coke 8wt%, smelting time is 45min, and smelting temperature is 1250±50°C. The yield of metal phase iron obtained by smelting is 25wt%, the recovery rate of iron is 90.5wt%, and the recovery rate of copper is 99.0wt%. : TFe is 4.08wt%, Cu≤0.001wt%, Pb≤0.001wt%, Zn≤0.001wt%, SiO 2 is 38.60wt%, and CaO is 19.05wt%; the content of Zn in the dust is ≥ 91wt%, and that of Pb is ≥ 90wt%.

example 3

[0021] The weight percent of the main chemical components of the raw material zinc kiln slag is TFe33.55wt%, Zn6.46wt%, Pb0.28wt%, Cu1.1wt%, C22wt%, the particle size is ground to -0.074mm mesh, accounting for 65wt%, high temperature smelting process conditions For: composite additive CaF 2 , CaO and SiO 2 The addition amount is 10wt%, the amount of coke added is 5wt%, the smelting time is 30min, the smelting temperature is 1300°C, the yield of metal phase iron obtained by smelting is 20wt%, the recovery rate of iron is 88.5wt%, and the recovery rate of copper is 99.5wt %. The metallographic analysis of iron is shown in Figure 3, and the corresponding slag chemical composition: TFe is 5.1wt%; Cu≤0.001wt%; Pb≤0.001wt%; Zn≤0.001wt%; SiO 2 It is 36.14wt%; CaO is 17.88wt%. The recovery rate of zinc in smoke dust is Zn≥92wt%, and Pb≥91wt%.

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Abstract

The invention relates to a method for recycling the valuable element from the zinc kiln slag. The method comprises the steps as follow: the raw material zinc kiln slag is grinded to a granularity of minus -0.074 millimeter, and the zinc kiln slag has a weight ratio of 50 to 75 percent; the mixture is sent to a high temperature furnace for melting after adding cokes which is 2 to 10 percent of the raw material and fully mixing the CaF2, CaO and SiO2 with a weight ratio of 1: 1: 1; the melting temperature is controlled from 1200 DEG C to 1350 DEG C and the melting time is controlled from 30 minutes to 60 minutes; and then metallographic phase, flue phase and slag phase are gained. Metallic iron and metallic copper can be layered from metallographic phase; lead and zinc can be recycled from the flue; and silicon and calcium element can be recycled from the slag phase. The invention achieves the separation and collection of the valuable elements such as copper, iron, zinc and plumbic from the zinc kiln slag.

Description

1. Technical field [0001] The invention relates to a method for recovering valuable elements from zinc kiln slag, specifically a method for processing zinc kiln slag at a lower temperature to obtain metal phase, soot phase and slag phase. It belongs to the technical field of nonferrous metallurgy. 2. Technical background [0002] Zinc kiln slag is mixed with coke powder or coal powder in the leaching slag of zinc hydrometallurgy, and then roasted in a rotary kiln at a temperature of 1200-1300°C or higher, so that most of the zinc, lead, indium and The residue after a small part of germanium volatilizes into the smoke belongs to the secondary smelting slag. Zinc kiln slag contains valuable metal elements such as iron, zinc, copper and silver, and contains a certain amount of carbon. However, due to its complex phase and difficult to recycle, it is discarded and stockpiled or sold at a low price, resulting in waste of resources and environmental pollution. There is known doc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/14C22B5/02
CPCY02P10/20
Inventor 魏昶黄孟阳彭金辉李静张世敏张利波雷鹰李雨
Owner KUNMING UNIV OF SCI & TECH
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