Method for preparing magnetic P-type molecular sieve by using coal gangue

Abstract

The invention discloses a method for preparing a magnetic P-type molecular sieve by using coal gangue. The method comprises: 1, grinding coal gangue, and carrying out high temperature calcining activating on the grinded coal gangue by using sodium carbonate; 2, oxidizing at a low temperature, adding hydrochloric acid, soaking, and filtering; 3, preparing an iron-doped molecular sieve from the filtration residue and the filtrate obtained after the filtration; and 4, placing the iron-doped molecular sieve in a porcelain boat, placing the porcelain boat in a tubular furnace, introducing nitrogen into the tube furnace, introducing hydrogen after the air in the tubular furnace is completely discharged, heating to a temperature of 650-700 DEG C, continuously carrying out a reduction reaction for 2-3 h, introducing nitrogen after completing the reaction, and cooling to a room temperature to obtain the magnetic P-type molecular sieve. According to the present invention, the coal gangue is used as the raw material, the Fe<3+> dissolution is performed with hydrochloric acid and is complexed by adding oxalic acid, and finally high temperature reduction is performed to prepare the magnetic P-type molecular sieve; the magnetic P-type molecular sieve has characteristics of high specific surface area and strong adsorption performance; and the magnetic P-type molecular sieve is easy to separate and recover through the external magnetic field, and the problem of high cost of the molecular sieve synthesis is solved.

Description

technical field

[0001] The invention belongs to the technical field of P-type molecular sieve preparation, and in particular relates to a method for preparing magnetic P-type molecular sieves from coal gangue. Background technique

[0002] Coal gangue is solid waste discharged during coal mining and coal preparation. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process, and has a large output. At present, the application of coal gangue is mainly limited to the construction industry, energy industry and agriculture, and the utilization level and proportion are relatively low. Its large accumulation not only affects the environment but also occupies a large amount of land. Using it to prepare molecular sieves can not only reduce pollution, expand the source of raw materials for molecular sieves, but also increase its added value and expand the utilization of coal gangue. There are two types o...

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