Porous carbon material for filtering and preparation method thereof

Abstract

The invention discloses a porous carbon material for filtering and a preparation method thereof. The preparation method specifically comprises the following steps that a raw material, an adhesive anda pore-forming agent are prepared, wherein the raw material is one of green petroleum coke and raw asphalt coke, the adhesive is petroleum asphalt, and the pore-forming agent is a mixed powder of butadiene styrene rubber powder and tire rubber powder; the preparation method comprises the following steps: crushing and balling the raw materials into powder, then screening the obtained powder by using a vibrating screen to obtain two-stage raw materials of -60 to +80 meshes and -80 to +120 meshes, and finally proportioning the two-stage raw materials of-60 to + 80 meshes and-80 to + 120 meshes according to a mass ratio of (30-40): (60-70); heating and mixing the prepared raw material and the pore-forming agent, then adding the adhesive which is heated and melted in advance, and mixing for 2 hours at the temperature of 150 DEG C to obtain a mixture; wherein the mass part ratio of the raw material to the adhesive to the pore-forming agent is (60-76): (20-30): (4-10); carrying out compression molding on the mixture to form a blank; and introducing the blank in a roasting furnace for segmented heating roasting to obtain the porous carbon material. The porous carbon material prepared by the method is narrow in pore size distribution and high in strength.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a porous carbon material for filtering and a preparation method thereof. Background technique [0002] High-risk materials, heavy metals, precious metals, coal gasification, and environmental protection all need a purification material that can withstand high temperature and corrosion, has good air permeability, high filtration accuracy, and is easy to clean. At present, the porous filter materials used to purify liquids and gases are mostly ceramic materials, metal and alloy materials, polymer materials, fiber materials, porous carbon or foam carbon materials, etc. However, because metal and ceramic materials are resistant to high temperature but not corrosion resistant, while polymer materials and fiber materials are not resistant to high temperature, their application as porous filter materials is limited, while porous carbon materials have heat resistance, corrosio...

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Problems solved by technology

[0004] Chinese patent CN102417174A discloses a porous carbon material and its preparation method. The patent uses raw petroleum coke, raw pitch coke, and metallurgical coke as skeleton carbon raw materials, pitch and coal tar as bonding carbon, wood powder, ammonium chloride, etc. As a foaming agent, the porous carbon material is prepared by calcining and carbonizing at 1100°C after mixing the ingredients and molding. Wide pore size distribution (1-200μm), low filtration precision, limited application in high-pressure filtration and fine filtration