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Method for recovering valuable metals in iron and steel industry solid waste

A valuable metal and iron and steel industry technology, which is applied in the field of solid waste valuable metal recovery in the iron and steel industry, and can solve the problems of low metal recovery rate and so on.

Active Publication Date: 2019-03-15
LIUZHOU IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of low metal recovery rate in metallurgical solid waste in the process of metal recycling in the prior art, and to provide a method for recovering valuable metals from solid waste in the iron and steel industry. The waste is made into inner pellets, and then the metallurgical solid waste is coated on the outer surface of the inner pellets to form a coating layer, and then the coated pellets are roasted to achieve the reduction and evaporation of heavy metals, thereby increasing the concentration of metals in metallurgical solid waste. recovery rate

Method used

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  • Method for recovering valuable metals in iron and steel industry solid waste
  • Method for recovering valuable metals in iron and steel industry solid waste
  • Method for recovering valuable metals in iron and steel industry solid waste

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Embodiment 1

[0042] Such as Figure 1~3 As shown, a method for recovering valuable metals from solid waste in the iron and steel industry of the present invention, the metallurgical solid waste powder A is made into inner pellets 100, wherein ω in the metallurgical solid waste powder A Zn ≥3%, the molar ratio of C to Zn is k:1, and 1≤k≤5; then wrap the metallurgical solid waste powder B on the surface of the inner layer pellet 100 to form a coating layer 200; wrap the coated pellet Put it in the grate machine 400-rotary kiln 500 for preheating and roasting, so that the metal zinc in the pellets is reduced and evaporated, and the metal zinc in the rotary kiln 500 is recovered through the air extraction device 501 . During the pelletizing process, the metallurgical solid waste powder B forms a cladding layer to wrap the outer surface of the inner pellet of the metallurgical solid waste powder A. The cladding layer can act as a barrier and heat conduction to the inner pellet. On the one hand...

Embodiment 2

[0081] This embodiment is basically the same as Embodiment 1, except that in the inner pellet 100 of this embodiment, the mass percentage of metallurgical solid waste powder A with a particle size of 200 mesh to 150 mesh is 60%, and the cladding layer 200 The mass percentage of the metallurgical solid waste powder material B with a particle size of less than 300 meshes is still 80%, and this embodiment increases the mass percentage of the large particle size metallurgical solid waste powder material A in the inner pellet 100; Roasting and metal recovery steps are the same as in Example 1. The recovery records of each metal in this embodiment are shown in Table 3.

Embodiment 3

[0083] This embodiment is basically the same as Embodiment 1, except that in the cladding layer 200 of this embodiment, the mass percentage of metallurgical solid waste powder with a particle size of less than 300 mesh is 90%. The metallurgical solid waste powder A with a particle size of 200 mesh to 150 mesh in the inner layer pellet 100 is still 55%. This embodiment aims to improve the quality of the metallurgical solid waste powder B in the coating layer 200 with a particle size of less than 300 mesh Percentage; Then pelletizing, pellet roasting and metal recovery steps are the same as in Example 1. The recovery records of each metal in this embodiment are shown in Table 3.

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Abstract

The invention discloses a method for recovering valuable metals in iron and steel industry solid waste, and relates to the technical field of metallurgical solid waste resource utilization. The method comprises the following steps that metallurgical solid waste powder A is prepared into inner-layer pellets, wherein omega Zn is more than or equal to 3% in the metallurgical solid waste powder A, the mole ratio of C to Zn is k:1, and k is more than or equal to 1 and less than or equal to 5; then metallurgical solid waste powder B is wrapped around the surfaces of the inner-layer pellets to forma coating layer; the coated pellets are placed in the grate-rotary kiln for preheating and roasting, then metal zinc in the pellets is reduced and evaporated, and the metal zinc in the rotary kiln isrecovered through an exhaust device. By adopting the method, the coating layer plays a role in blocking and conducting heat on the inner-layer pellets, on one hand, the coating layer can form a reducing atmosphere at the inner-layer pellets, on the other hand, the coating layer can enable the inner-layer pellets to keep the relatively high temperature, and then reduction and recovery of the heavymetals such as zinc in the inner-layer pellets can be promoted.

Description

technical field [0001] The invention relates to the technical field of utilization of metallurgical solid waste resources, and more specifically relates to a method for recovering valuable metals from solid waste in the iron and steel industry. Background technique [0002] At present, there are a large number of metallurgical solid wastes in the iron and steel metallurgical industry, among which blast furnace dust is one of them. Blast furnace dust is rich in heavy metals such as Fe, C, Zn, and Pb, and has good comprehensive recycling value; while converter Dust contains a large amount of Fe elements (TFe≥50%), and the economic benefits of recycling are also very significant; in addition, electric furnace ash also contains a large amount of heavy metal elements, and sintered ash contains a large amount of Fe elements, which has a huge recycling value. [0003] For metallurgical solid waste, due to the low metal recovery rate in metallurgical solid waste, many iron and steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/24C22B1/248C22B1/216C22B5/10C22B19/04C22B19/30
CPCC22B1/216C22B1/24C22B1/248C22B5/10C22B7/001C22B7/02C22B19/04C22B19/30Y02P10/20
Inventor 阮志勇春铁军张艾红龙红明李雁翎王子宏魏汝飞潘晶张福元张芳
Owner LIUZHOU IRON & STEEL