Method for preparing SHS ceramic liner metal tube from iron-based wastes

A metal pipe and ceramic lining technology, applied in the field of resource recycling and surface coating, to achieve the effect of wide source of raw materials, reduce raw material costs, and prevent deformation

Inactive Publication Date: 2010-12-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing SHS ceramic liner metal tube from iron-based wastes
  • Method for preparing SHS ceramic liner metal tube from iron-based wastes
  • Method for preparing SHS ceramic liner metal tube from iron-based wastes

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Embodiment 1

[0035] Will contain Cr, Ni, V, Mn metal elements (see figure 2 ), Al 2 o 3 and SiO 2 of iron-based scrap (see image 3 ) was baked at 200°C to remove water vapor and impurities, and sieved to obtain -80 mesh powder. It is evenly mixed with reducing agent Al powder, and its mass ratio is Al powder: iron-based waste material is 1:10. The mixture is evenly loaded into the steel pipe and fixed on the pipe making machine. Start the centrifuge, and when the rotating speed reaches 800 rpm, ignite the mixture with a tungsten wire to sinter by SHS centrifugal reaction. Under the action of centrifugal force, a steel pipe with a "sandwich" structure is formed, from the inside to the outside, in order of ceramic layer 1, ferroalloy layer 2 and steel pipe matrix layer 3. The crushing strength of the steel pipe is 326MPa, and the hardness is 1280kgf / mm 2 . Steel pipe linings were at 20% H 2 SO 4 , 20% HCl and aqua regia accelerated corrosion, the weight loss is 0.08g / m3 2 d, 0.0...

Embodiment 2

[0037] It will contain metal elements such as Cr, Ni, V, Mn (see figure 2 ), Al 2 o 3 and SiO 2 of iron-based scrap (see image 3 ) was baked at 300°C to remove water vapor and impurities, and sieved to obtain -120 mesh powder. It is evenly mixed with reducing agent Al powder, and its mass ratio is Al powder: iron-based waste material is 1:5. The mixture is evenly loaded into the steel pipe and fixed on the pipe making machine. Start the centrifuge, and when the rotating speed reaches 1200 rpm, ignite the mixture with a tungsten wire to sinter by SHS centrifugal reaction. Under the action of centrifugal force, a steel pipe with a "sandwich" structure is formed, from the inside to the outside, in order of ceramic layer 1, ferroalloy layer 2 and steel pipe matrix layer 3. The crushing strength of the steel pipe is 315MPa, and the hardness is 1380kgf / mm 2 . Steel pipe linings were at 20% H 2 SO 4 , 20% HCl and aqua regia accelerated corrosion, the weight loss is 0.06g / ...

Embodiment 3

[0039] It will contain metal elements such as Cr, Ni, V, Mn (see figure 2 ), Al 2 o 3 and SiO 2 of iron-based scrap (see image 3 ) was baked at 400°C to remove water vapor and impurities, and sieved to obtain -180 mesh powder. It is evenly mixed with reducing agent Al powder, and its mass ratio is Al powder: iron-based waste material is 1:1. The mixture is evenly loaded into the steel pipe and fixed on the pipe making machine. Start the centrifuge, and when the rotating speed reaches 1400 rpm, ignite the mixture with a tungsten wire to sinter by SHS centrifugal reaction. Under the action of centrifugal force, a steel pipe with a "sandwich" structure is formed, from the inside to the outside, in order of ceramic layer 1, ferroalloy layer 2 and steel pipe matrix layer 3. The crushing strength of the steel pipe is 308MPa, and the hardness is 1420kgf / mm 2 . Steel pipe linings were at 20% H 2 SO 4 , 20% HCl and aqua regia accelerated corrosion, the weight loss is 0.05g / ...

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Abstract

The invention relates to a method for preparing an SHS ceramic liner metal tube from iron-based wastes and discloses a method for manufacturing a corrosion-resistant and wear-resistant ceramic liner metal tube. The technical scheme is that: the treated iron-based wastes and Al powder are proportioned, mixed and sintered through an SHS centrifugal thermit reaction; an iron alloy layer and a ceramic layer are formed on an inner wall of the metal tube under the action of centrifugal force; and the prepared metal tube has the sandwich structural characteristic, namely the ceramic layer 1, the iron alloy layer 2 and a metal tube substrate layer 3 are formed from the interior to the exterior in turn. The method for preparing the SHS ceramic liner metal tube solves the problem that the conventional ceramic liner metal tube has over-high manufacturing cost and ceramic surface quality defect, and improves the wear resistance and corrosion resistance of the tube. The prepared metal tube can be widely applied to conveying powder, slurry and tailings in metallurgy, mines, electric power, coal and other industries.

Description

technical field [0001] The invention relates to a method for using iron-based waste materials in SHS ceramic-lined metal pipes, and belongs to the technical fields of resource recycling and surface coating. Background technique [0002] With the rapid development of my country's iron and steel industry, the output of iron-based waste has increased dramatically. Iron-based waste includes roll grinding materials, cold (hot) rolling iron scales, etc. According to incomplete statistics, iron-based waste is about 2 million tons per year. On the one hand, iron-based waste has brought serious environmental burdens to iron and steel enterprises; on the other hand, iron-based waste contains a large amount of Fe and a certain amount of valuable metal resources such as Cr, Ni, V, and Mn. Therefore, the comprehensive utilization of iron-based waste can not only reduce the environmental burden of iron and steel enterprises, but also facilitate the reuse of resources, which has importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F3/23
Inventor 张深根刘波田建军潘德安李彬
Owner UNIV OF SCI & TECH BEIJING
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