Preparation method of coal-based magnetic activated carbon and coal-based magnetic activated carbon

Abstract

The invention relates to a preparation method of coal-based magnetic activated carbon and the coal-based magnetic activated carbon. The preparation method of the coal-based magnetic activated carbon comprises the following steps of: placing deashing coal dust and dodecyl sodium sulfate into a ferric chloride solution, sufficiently mixing, and then standing for adsorption; then adding ammonia water and a sodium hydroxide solution or a potassium hydroxide solution, sufficiently stirring, and then standing for transforming ferric chloride into ferric hydroxide; filtering and drying solid-phase materials to obtain a mixture of deashing coal and the ferric hydroxide, i.e. a precursor of the coal-based magnetic activated carbon; sufficiently mixing the precursor with activating agents, i.e. potassium hydroxide or sodium hydroxide, adding distilled water to stir into paste, and warming for carbonization under the protection of nitrogen; and heating and activating under the protection of the nitrogen. The obtained coal-based magnetic activated carbon has difficult blockage of pores because a magnet exists in a state of Fe3C, thereby having higher saturation and magnetization intensity and larger specific surface area. The invention has the advantages of extensive source of coal raw materials, low cost, simple preparation process and easy separation and recovery of the coal-based magnetic activated carbon.

Description

technical field [0001] The invention relates to a preparation method of coal-based magnetic activated carbon and products thereof. Background technique [0002] Giving magnetism to activated carbon by some technical means can not only take advantage of the good adsorption of activated carbon itself, but also use its magnetism to separate and recover by magnetic separation technology, so as to overcome the loss of broken carbon in the traditional filtration method of ordinary activated carbon , screen clogging and other shortcomings, so it has gradually been widely used in the fields of gold recovery and sewage treatment. There are many ways to impart magnetism to activated carbon. Only by distinguishing the base material for preparing magnetic activated carbon, there are two types: ordinary finished activated carbon as base material and raw material for preparing activated carbon (for example: coal) as base material. Among them, the latter The step of preparing or purchasin...

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Problems solved by technology

However, because the magnetic activated carbon is a shaped magnetic activated carbon that uses a binding agent in the preparation process, the presence of the binding agent will easily cause the clogging of the pores of the magnetic activated carbon, and the operation in the industrial production situation is slightly improper. The specific surface area is very easy to reduce, that is, it cannot reach the satisfactory specific surface area under laboratory conditions; secondly, like other magnetic activated carbon preparation methods, the magnetic additives in the prepared products are not organically combined with the carbon structure, but only distributed in the activated carbon. On the surface of the structure or the surface wall in the pores, it is easy to cause some pores to be blocked, thereby reducing the specific surface area; moreover, most of the magnetic activated carbons currently prepared have low saturation magnetization and poor magnetic properties.

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