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Compound magnetic matrix rod with high magnetic field intensity and preparation method thereof

A magnetic gathering medium and magnetic field strength technology, applied in the mineral processing field, can solve the problems of poor magnetic separation process, general magnetization performance, corrosion resistance of ferromagnetic material loss, etc., to improve the magnetic field strength, service life and recovery rate Effect

Pending Publication Date: 2018-04-06
嘉峪关天源新材料有限责任公司
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Problems solved by technology

[0005] In order to solve the problems that the magnetization performance of the magnetic gathering rod-shaped medium commonly used in the prior art is average, resulting in poor magnetic separation process, loss of some ferromagnetic substances and poor corrosion resistance, the present invention provides a composite magnetic gathering medium rod with high magnetic field strength and its preparation method

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  • Compound magnetic matrix rod with high magnetic field intensity and preparation method thereof

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preparation example Construction

[0019] The preparation method of the composite magnetic-gathering medium rod with high magnetic field strength specifically includes: (1) the pure iron rod is acid-washed, alkali-washed, dried and preheated in sequence; (2) immersed in low-chromium stainless steel liquid for reverse solidification; ( 3) Then immerse in high chromium stainless steel liquid for reverse solidification; (4) After annealing, a composite magnetic gathering medium rod is formed.

[0020] In the step (1), sulfuric acid with a mass fraction of 7% to 15% is used for pickling to remove rust.

[0021] In the step (1), 10% to 15% sodium hydroxide is used for alkali washing to remove surface oil stains.

[0022] The drying and preheating in the step (1) is carried out in a vacuum furnace, and the preheating temperature is 850°C to 950°C.

[0023] The chemical composition of the low-chromium stainless steel liquid in the step (2) is; w(C)≤0.030%, w(Si)≤0.50%, w(Mn)≤0.030%, w(S)≤0.030%, w( P)≤0.040%, 10.50≤...

Embodiment 1

[0027] Select a pure iron rod 1 with a diameter of 2mm electrical pure iron DT4C for surface treatment, and after the surface of the pure iron rod 1 is derusted with 7% sulfuric acid by mass fraction, it is then alkali-washed with 10% sodium hydroxide , remove oil stains on the surface of pure iron rod 1, dry and preheat after drying in a hollow furnace, the preheating temperature of the drying furnace is 950°C, and immerse the preheated pure iron In the low-chromium stainless steel liquid, the temperature of the liquid steel is about 1550°C, and the chemical composition of the controlled liquid steel is; w(C)=0.027%, w(Si)=0.46%, w(Mn)=0.018%, w(S) =0.024%, w(P)=0.026%, w(Cr)=10.71%, carry out reverse solidification in the high-temperature molten low-chromium stainless steel liquid, the solidification time is 0.2s, after the high-temperature molten low-chromium stainless steel liquid Quickly immerse in high-chromium stainless steel liquid, the temperature of the liquid steel ...

Embodiment 2

[0030]The invention utilizes low-chromium ferritic stainless steel to form reverse solidification structure of low-chromium ferritic stainless steel on pure iron, and then reverse-solidifies high-chromium ferritic stainless steel on the reverse solidification structure of low-chromium ferritic stainless steel The liquid forms a reverse solidification layer of high-chromium ferritic stainless steel, which is conducive to improving the bonding force of the interface between pure iron and low-chromium stainless steel, the low-chromium stainless steel interface and the high-chromium stainless steel interface, and solves the problem of using high-chromium ferrite directly on pure iron. Reverse solidification of stainless steel, due to the direct compounding process of high chromium stainless steel liquid, it is easy to form a pure iron interface, the cooling speed is fast, and the lattice distortion energy is large, which is easy to cause cracks on the joint surface.

[0031] The ...

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Abstract

The invention relates to the field of mineral separation, and discloses a compound magnetic matrix rod with high magnetic field intensity and a preparation method thereof. The method comprises the steps that a pure iron rod is sequentially subjected to acid pickling, alkaline cleaning and drying preheating; the pure iron rod is immersed into a low-chromium stainless steel liquid to be subjected toinversion solidification; the pure iron rod is immersed into a high-chromium stainless steel liquid to be subjected to inversion solidification; and annealing is carried out, and the compound magnetic matrix rod is formed. According to the preparation method, the problems that a magnetic matrix rod is poor in magnetism and short in service life are solved, the magnetizing field intensity of a magnetic matrix is improved, the recovery rate of magnetic mineral is increased, and tailing discharge is reduced.

Description

technical field [0001] The invention specifically relates to the field of ore dressing, and more specifically relates to a composite magnetic-gathering medium rod with high magnetic field strength and a preparation method thereof. Background technique [0002] The high-gradient magnetic separator is to obtain high-strength magnetism by implanting a magnetic gathering medium in the internal strong magnetic field, so as to realize the recycling of weak magnetic minerals. Shaped media, etc., and the rod-shaped magnetic gathering medium used in the vertical ring high-speed magnetic separator is widely used because of its large surface interface and good magnetic separation effect, which is recognized by the mineral processing field; [0003] The rod-shaped medium requires high magnetism in the magnetic field, and the material of the commonly used rod-shaped medium is magnetically conductive stainless steel, which has good wear resistance and corrosion resistance, but poor magnet...

Claims

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Application Information

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IPC IPC(8): B03C1/031C22C38/02C22C38/04C22C38/18C22C38/22C22C38/26C22C38/28C21D1/26C21D9/00
CPCC21D1/26C21D9/0075C22C38/02C22C38/04C22C38/18C22C38/22C22C38/26C22C38/28B03C1/031Y02P10/20
Inventor 白江虎李具仓任娟红王军宏马艳丽刘险峰邵建勇孙爱楠宋宗亮陈磊薛海军周培山
Owner 嘉峪关天源新材料有限责任公司
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