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Method of improving fretting corrosion resistance of heat conducting coil in mineral fine powder steam drier and mineral fine powder steam drier

A technology of heat conduction plate and dryer, which is applied in the direction of pressure inorganic powder coating, metal material coating process, melt spraying, etc., and can solve the problem that the outer surface of heat conduction coil is easy to be rubbed and eroded

Pending Publication Date: 2019-11-29
武汉苏伯曼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for improving the anti-friction and abrasion resistance of the thermal conduction coil in the mineral fine powder steam drier, and the mineral fine powder steam drier, to solve the problems of the mineral fine powder steam drier in the prior art. The problem that the outer surface of the heat conduction coil is easily eroded by friction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment is used to improve the anti-friction and erosion performance of the heat conduction coil of the copper concentrate powder steam dryer. Before the copper concentrate powder enters the flash furnace for redox smelting, the moisture in the copper concentrate must be removed to less than 1%. Therefore, steam dryers are used in industry to dry and dehydrate copper concentrate powder.

[0049] Copper concentrate mainly has a water content of about 8%, and at the same time there are 20-25% sulfur compounds, a small amount of alkaline cation magnesium, calcium and anion chlorine, fluorine and so on. The main workpiece of the steam dryer is a curved heating coil made of 2752 special stainless steel. The dryer processes 180 tons to 220 tons of coarse powder per hour with a granularity of less than 200 meshes. The heating temperature is 200°C. The heating coil is immersed in the copper concentrate powder, and then the heating steam The heat is transferred to the c...

Embodiment 2

[0057] Still copper concentrate mainly contains about 6% water, and there are 19-22% sulfur compounds, a small amount of alkaline cation magnesium, calcium and anion chlorine, fluorine and so on. The main workpiece of the steam dryer is a curved heating coil, which is made of 316L stainless steel. The dryer can process 150 tons to 190 tons of coarse powder with a particle size of less than 180 mesh per hour. The heating temperature is 200 ° C. The heating coil Immersed in the copper concentrate powder to conduct heat to the copper concentrate powder, so that the contained moisture is heated and volatilized to remove.

[0058] Because the temperature is low, chemical corrosion such as oxidation and fluorine group element impurities are secondary, and the heating coil mainly faces the friction and abrasion of copper concentrate powder. In this embodiment, the outer surface of the heat conduction coil is plated with an anti-abrasion protective film layer. The purpose is to use th...

Embodiment 3

[0062] Still copper concentrate mainly contains about 8% water, and there are 20-22% sulfur compounds, a small amount of alkaline cation magnesium, calcium and anion chlorine, fluorine and so on. The main workpiece of the steam dryer is a curved heating coil, which is made of 316L high-quality stainless steel. The dryer can process 180 tons to 250 tons of coarse powder with a particle size of less than 200 mesh per hour. The heating temperature is 200 ° C. The coil is immersed in the copper concentrate powder to conduct heat to the copper concentrate powder containing water, so that the copper concentrate powder is heated and the moisture contained in it is heated and volatilized to be removed.

[0063] Because the temperature is low, chemical corrosion such as oxidation and fluorine group element impurities are secondary, and the heating coil mainly faces the friction and abrasion of copper concentrate powder. In this embodiment, the outer surface of the heat conduction coil ...

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Abstract

The invention provides a method of improving fretting corrosion resistance of a heat conducting coil in a mineral fine powder steam drier and the mineral fine powder steam drier. The method comprisesthe following steps: carrying out surface pre-treatment on the outer surface of the heat conducting coil; plating an anti-wear protecting layer to the outer surface of the heat conducting coil, wherein the anti-wear protecting layer is prepared from the raw materials in parts by weight: 82-87 parts of tungsten carbide, 9.5-15 parts of cobalt, 3.5-4.5 parts of chromium, 0-0.5 part of titanium carbide and 0-0.5 part of tantalum carbide. In the treatment way, the fretting corrosion resistance of the heat conducting coil in the mineral fine powder steam drier can be improved obviously, the surfaceperformance of the heat conducting coil is improved, and the service life of a heat conducting coil workpiece in a mineral fine powder drying and dehydrating treatment process is prolonged effectively.

Description

technical field [0001] The invention relates to the technical field of metal anticorrosion, in particular to a method for improving the anti-friction and abrasion resistance of heat conduction coils in a mineral fine powder steam drier, and the mineral fine powder steam drier. Background technique [0002] In the field of mineral smelting industry, the anti-corrosion of workpiece surface has always been the subject of research and discussion in this field, especially the anti-corrosion application of metal workpieces in some important and key processes. The length of use of these workpieces determines the improvement of the production efficiency of the smelting process and the optimal control of costs. The improvement of the anti-corrosion performance of the surface can improve the corrosion resistance of the workpiece to prolong its service life. The surface anti-friction and abrasion protective film is a modification treatment for the metal surface, and a protective film i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06C23C4/02C23C24/04
CPCC23C4/02C23C4/06C23C24/04C23C4/134
Inventor 刘恒吴军肖小军文仁夏中志吴劲松王峰刘昌勇易瑞祥袁春峰
Owner 武汉苏伯曼科技有限公司
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