Three-dimensional through-hole or part-hole interconnecting porous metal foam and its preparing method

Abstract

The invention relates to a multi-hole foamed metal material and the manufacturing method. It includes the following steps: equally dispersing metal or alloy powder that has the particle diameter at 1-100um into solution contains adhesive agent to make slime, pouring the slime into through-hole polyurethane sponge foam, after taking drying and sintering, the material would be gained. It also could be make by the method of directly isostatic cool pressing one or more metal or alloy powder, isostatic cool pressing after mixing with pore forming material or isostatic cool pressing after mixing with adhesive agent solution to gain green pressing that would be sintered in vacuum furnace to make the material. The invention could be used to process vehicle tail gas and could also be used to filter the smoke form thermal power station or metallurgical furnace.

Description

[technical field] [0001] The invention relates to a porous metal foam material for filtering dust or particles and a preparation method thereof. [Background technique] [0002] Exhaust gas from automobiles and flue gas from thermal power plants and metallurgical furnaces contain a large amount of harmful dust such as lead compounds and soot, as well as harmful exhaust gases such as carbon monoxide, hydrocarbons, nitrides, and sulfur dioxide. These harmful dust and Exhaust gas has polluted the human living environment. In the treatment of flue gas, dry methods such as bag dust collection, electric dust collection and cyclone dust collection are usually used, or wet methods such as water film, water bath and Venturi are used for dust collection. However, the temperature of exhaust gas treated by conventional dust collection is required to be below 500°C, and conventional dust collection cannot catalytically decompose exhaust gas, let alone filter and catalytically decompose a...

AI Technical Summary

Problems solved by technology

The carrier has the advantages of large specific surface area and good heat resistance, but it has fatal defects of large heat and low thermal conductivity. Within 1 to 3 minutes after starting, its purification effect is quite limited. In addition, it also has the defects of being fragile, unable to resist shearing, bending and stretching; (3) metal carrier

The metal carrier has the advantages of large specific surface area, strong shock resistance, fast ignition speed and small back pressure, but the current metal carrier is generally made of corrugated metal foil and flat metal foil stacked together. The honeycomb overall structure made by this structure cannot meet the filter performance requirements for particles

[0003] In the current silicothermal magnesium smelting process, since the surface of the pellets entering the reduction tank inevitably contains free dust, the main components of the dust are CaO, MgO and Si-Fe, the most harmful of which is Si dust, which enters the magnesium After the vapor condensation zone, it is easy to generate Mg 2 Si, this alloyed Mg 2 Si is difficult to remove during the refining of crude magnesium, which will lead to a decrease in the grade of metallic magnesium

Therefore, it is of great significance to filter dust during vacuum thermal reduction. At present, thermal magnesium smelting plants have not found an effective way to prevent Si-containing dust from entering crystalline magnesium.

On the other hand, K and Na impurities are unavoidable in the raw materials (dolomite) for thermal magnesium smelting. K and Na will be preferentially reduced during reduction. If they enter the vacuum pipeline to condense, K and Na will be reduced when the vacuum is broken. It will cause combustion and even explosion. The current industrial K and Na traps cannot completely avoid its condensation in the vacuum pipeline.

[0004] During titanium metallurgy, crude TiCl 4 It often contains a certain amount of suspended solids (such as TiO 2 , SiO 2 , AlCl 3 , AlOCl, VOCl 2 etc.), these suspended solids must be filtered out. At present, glass fiber cloth is used in industry for filtration. The filter material is usually disposable, and some particles cannot be filtered clean; Alloy melts generally go through a filtration step. For example, most aluminum alloys in industry are filtered by fiber filter cloth or ceramic filter plate. These filter materials cannot be recycled, and there are secondary pollutions caused by ceramic particles falling off and falling off. Defects such as alloy melt and some particles cannot be filtered clean

Images