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System and method for comprehensively treating zinc dross

A technology for comprehensive treatment and zinc scum, applied in the field of metallurgy, can solve the problems of unrealized separation of zinc oxide and zinc chloride, unfriendly environment, high chlorine content in flue gas, and achieve good economic benefits and environmental emission reduction benefits. Simple process and the effect of improving zinc recovery rate

Pending Publication Date: 2021-02-12
云锡文山锌铟冶炼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent application with the application number 20111037769.6 discloses a method for extracting metal zinc powder for different purposes from zinc dross. The main process is that the dross is repeatedly ground by a ball mill, and then sieved to separate zinc powder and zinc ash of different particle sizes. There are three deficiencies in this process: one is that the block zinc is not easy to be ground, the grinding efficiency is low, and repeated grinding increases energy consumption; the other is that the complete separation of zinc powder and zinc ash is not realized, and the purity of zinc powder is low; Realize the separation of zinc oxide and zinc chloride. Zinc ash contains chlorine and is returned to the fluidized furnace for preparation. The flue gas contains high chlorine, which corrodes equipment and is not friendly to the environment.

Method used

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  • System and method for comprehensively treating zinc dross
  • System and method for comprehensively treating zinc dross
  • System and method for comprehensively treating zinc dross

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Step 1: Take 5000Kg of zinc scum (larger lumps of zinc have been picked out), cool naturally to below 60°C, turn on the centrifugal fan of the bag filter, and adjust the air volume to 25000-30000Nm 3 / h, and the zinc scum is evenly and slowly added to the silo, sieved by a linear vibrating sieve to obtain block zinc and undersieves containing zinc particles and zinc powder ash, block zinc enters the slag hopper from the chute;

[0088] Step 2: Supply the undersieve containing zinc particles and zinc powder ash to a ball mill for grinding, separate the zinc particles and zinc powder ash, and discharge the zinc particles from the zinc particle outlet of the ball mill into the slag hopper;

[0089] Step 3: Discharge the zinc powder and zinc ash from the zinc powder ash outlet of the ball mill into the dust collection pipe. Due to the difference in quality, the zinc powder enters the cyclone dust collector for collection, and the zinc dust enters the bag filter for collectio...

Embodiment 2

[0097] Step 1: Take 5000Kg of zinc scum (larger lumps of zinc have been picked out), cool naturally to below 60°C, turn on the centrifugal fan of the bag filter, and adjust the air volume to 25000-30000Nm 3 / h, and the zinc scum is evenly and slowly added to the silo, sieved by a linear vibrating sieve to obtain block zinc and undersieves containing zinc particles and zinc powder ash, block zinc enters the slag hopper from the chute;

[0098] Step 2: Supply the undersieve containing zinc particles and zinc powder ash to a ball mill for grinding, separate the zinc particles and zinc powder ash, and discharge the zinc particles from the zinc particle outlet of the ball mill into the slag hopper;

[0099] Step 3: Discharge the zinc powder and zinc ash from the zinc powder ash outlet of the ball mill into the dust collection pipe. Due to the difference in quality, the zinc powder enters the cyclone dust collector for collection, and the zinc dust enters the bag filter for collection....

Embodiment 3

[0107] Step 1: Take 5000Kg of zinc scum (larger lumps of zinc have been picked out), cool naturally to below 60°C, turn on the centrifugal fan of the bag filter, and adjust the air volume to 25000-30000Nm 3 / h, and the zinc scum is evenly and slowly added to the silo, sieved by a linear vibrating sieve to obtain block zinc and undersieves containing zinc particles and zinc powder ash, block zinc enters the slag hopper from the chute;

[0108] Step 2: Supply the undersieve containing zinc particles and zinc powder ash to a ball mill for grinding, separate the zinc particles and zinc powder ash, and discharge the zinc particles from the zinc particle outlet of the ball mill into the slag hopper;

[0109] Step 3: Discharge the zinc powder and zinc ash from the zinc powder ash outlet of the ball mill into the dust collection pipe. Due to the difference in quality, the zinc powder enters the cyclone dust collector for collection, and the zinc dust enters the bag filter for collectio...

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Abstract

The invention discloses a system and method for comprehensively treating zinc dross. The system for comprehensively treating the zinc dross comprises a screening device, a ball mill, a powder-ash separation unit, a pickling device, a first solid-liquid separation device and an evaporative crystallization device. The system is used for comprehensively treating the zinc dross, so that all material components in the zinc dross are thoroughly separated, the zinc recovery rate (the zinc recovery rate is up to 99% or above) is remarkably increased, and the system is simple in technological process,easy and convenient to operate, low in energy consumption and environmentally friendly. Besides, impurity element chlorine in the zinc dross is well opened, adverse effects on a zinc hydrometallurgy system are avoided, zinc chloride obtained through comprehensive treatment can be sold as a product, and good economic benefits and environmental emission reduction benefits are achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a system and method for comprehensively treating zinc scum. Background technique [0002] During the melting and casting process of zinc hydrometallurgy, due to the high temperature, the surface zinc liquid is easily oxidized by air, and a layer of zinc oxide scum is formed on the surface of the zinc molten pool, and the scum formation rate is 3% to 5%. In the process of zinc melting and casting, in order not to affect the production, it is necessary to remove part of the scum regularly to maintain a certain thickness of the scum layer. Before slag removal, it is usually necessary to sprinkle solid ammonium chloride and fully stir to react with zinc oxide to form zinc chloride, because the melting point of zinc chloride (about 283°C) is lower than that of zinc (419.5°C), and this reaction destroys the floating Zinc oxide film in the slag, so that the zinc liquid wrapped in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/00C22B19/04C22B19/30C01G9/04
CPCC01G9/04C22B1/005C22B7/006C22B7/04C22B19/04C22B19/30Y02P10/20
Inventor 陈先友朱北平姚应雄陈钢陶家荣孔正国何成道高占勋杨瑗纪开洪孙玉文
Owner 云锡文山锌铟冶炼有限公司