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Method for extracting zinc from non-ferrous metal waste residue

A non-ferrous metal and waste slag technology, applied in the field of zinc extraction, can solve the problems of high impurity content and low recovery rate, and achieve the effect of good taste, high recovery rate and simple principle

Inactive Publication Date: 2012-11-14
HANYUAN GUANGCHAO NON FERROUS METALS COMPREHENSIVE RECOVER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The extraction of zinc from traditional non-ferrous metal waste slag is mostly directly treated by wet process, but the impurity content after treatment is high and the recovery rate is low; The treatment process with good economic benefits has practical significance

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  • Method for extracting zinc from non-ferrous metal waste residue

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Embodiment 1

[0017] a. Take 300kg of non-ferrous metal waste slag (main content: 20-30% lead, 6-8% zinc) from an electrolytic zinc enterprise in Hanyuan County, mix it with coal powder at a mass ratio of 1:0.05, and add it to the rotary kiln. Smelt at 500°C for 5 hours, and then collect the soot phase secondary zinc oxide through a bag filter; the main chemical composition of secondary zinc oxide is: zinc 30%, lead 10%;

[0018] b. Under normal temperature and pressure, mix and stir secondary zinc oxide and water according to the solid-to-liquid mass ratio of 1:3.5, react for 10 minutes, add concentrated sulfuric acid with a mass fraction of 98%, carry out acid leaching, then wash and press filter , to obtain leaching slag and leaching solution; the leaching slag is returned to the precious metal smelting system; wherein, the process parameters of the acid leaching step are: initial acid concentration 170g / L, final acid concentration 5g / L, leaching temperature is 70°C, and reaction time is ...

Embodiment 2

[0022] a. Take 100kg of non-ferrous metal waste slag (main content: 20-30% lead, 6-8% zinc) from an electrolytic zinc enterprise in Shimian County, mix it with coal powder at a mass ratio of 1:0.1, and add it to the rotary kiln. Smelt at 600°C for 6 hours, then collect the soot phase secondary zinc oxide through a bag filter; the main chemical composition of secondary zinc oxide is: zinc 40%, lead 20%;

[0023] b. Under normal temperature and pressure, mix and stir secondary zinc oxide and water according to the solid-to-liquid mass ratio of 1:3.5, react for 10 minutes, add concentrated sulfuric acid with a mass fraction of 98%, carry out acid leaching, then wash and press filter , to obtain leaching slag and leaching solution; the leaching slag is returned to the precious metal smelting system; wherein, the process parameters of the acid leaching step are: initial acid concentration 180g / L, final acid concentration 8g / L, leaching temperature 80°C, reaction time 3.5 Hour;

[...

Embodiment 3

[0027] a. Take 200kg of non-ferrous metal waste slag (main content: lead 20-30%, zinc 6-8%) from an electrolytic zinc enterprise in Hanyuan County, mix it with coal powder at a mass ratio of 1:0.15, and add it to the rotary kiln. Smelt at 550°C for 5.5 hours, and then collect the soot phase secondary zinc oxide through a bag filter; among them, the main chemical composition of secondary zinc oxide is: zinc 35%, lead 30%;

[0028] b. Under normal temperature and pressure, mix and stir secondary zinc oxide and water according to the solid-to-liquid mass ratio of 1:3.5, react for 10 minutes, add concentrated sulfuric acid with a mass fraction of 98%, carry out acid leaching, then wash and press filter , to obtain leaching slag and leaching solution; the leaching slag is returned to the precious metal smelting system; wherein, the process parameters of the acid leaching step are: initial acid concentration 175g / L, final acid concentration 10g / L, leaching temperature is 75°C, and th...

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Abstract

The invention discloses a method for extracting zinc from non-ferrous metal waste residue. The method is characterized by comprising the steps of pyrometallurgy, acid leaching, zinc depositing, reduction smelting and the like. Firstly, a fire system is utilized to obtain smoke phase secondary zinc oxide products under specific smelting conditions to enable the zinc in the non-ferrous metal waste residue to enter a secondary zinc oxide phase as far as possible, so that good raw material foundation is laid for improving zinc quality; secondly, according to characteristics of the metal zinc, a wet process is utilized to recover the zinc under a certain process condition; and finally, the reduction smelting is performed on the obtained crude zinc to obtain refined zinc. By utilizing a fire-wet combination process to recover the zinc, the recovery rate of the zinc is high, the zinc quality is good, and cyclic utilization of the waste residue is achieved. The existing resources are further recovered, and pollution of the valuable metal to the environment is avoided, so that the method is safe and environment-friendly. Besides, the method is simple in principle, reasonable in flow path and low in cost.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a method for extracting zinc from nonferrous metal waste slag. Background technique [0002] At present, the production of non-ferrous metals, especially the production of lead and zinc, is mainly concentrated in several large and medium-sized electrolysis plants and smelters in China, and the raw materials are lead and zinc concentrates. Due to the non-renewability of resources, the reserves of lead and zinc concentrates are decreasing day by day, thus restricting the increase and demand of lead and zinc production. But on the other hand, some large and medium-sized electrolysis and smelting plants have produced a large amount of non-ferrous metal waste slag, which contains lead and zinc waste slag in different forms. If the material is not used effectively, it will cause a great waste of resources. In addition, when non-ferrous metals such as Zn, Pb, Cu or Cd in wast...

Claims

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Application Information

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IPC IPC(8): C22B19/30
CPCY02P10/20
Inventor 陈元超
Owner HANYUAN GUANGCHAO NON FERROUS METALS COMPREHENSIVE RECOVER
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