Method for preparing inorganic ceramic membrane separation device from coal gangue

Abstract

The invention discloses a method for preparing an inorganic ceramic membrane separation device from coal gangue. The process for removing impurities in the coal gangue through pickling comprises steps as follows: A, the coal gangue is mechanically crushed by a jaw crusher or a disc mill and subjected to ball milling by a ball mill; B, partial impurities are removed through pre-sintering at 400 DEG C; C, hydrochloric acid is slowly added to a beaker containing the pre-sintered coal gangue; D, the mixture is poured into a round-bottom flask after a reaction is stabilized and reacts for 2 h in an assembled pickling device; E, suction filtration is performed while the mixture is hot; F, repeated suction filtration is performed with clear water; G, a last-time filtrate is taken for measurement of PH until the filtrate is neutral and does not change color after an KSCN solution is added; H, the mixture is dried for use. The process for manufacturing a ceramic membrane comprises steps as follows: a, an aid is added to the pickled coal gangue for ball milling and mixing; b, decaying and pugging are performed; c, extrusion molding is performed; d, drying is performed; e, high-temperature sintering is performed. According to the method, component characteristics of the coal gangue are utilized, and a composite ceramic membrane tube with Al2O3 and SiO2 being the main components is developed and is used for high-temperature gas-solid separation in fields of industrial coal-fired boilers, metallurgy, building materials and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing an inorganic ceramic membrane separation element by using coal gangue. Background technique [0002] Coal gangue is a kind of black rock with low carbon content associated with coal during the coal formation process, and it is a solid waste produced in the process of coal mining and washing. Coal gangue contains a certain amount of combustible coal, SiO 2 and Al 2 o 3 The content of iron is more than 50%, and it also contains a certain amount of CaO, MgO, Fe 2 o 3 、K 2 O and Na 2 O and other metal oxides are a mixture containing a variety of minerals, including excavation gangue during roadway excavation, gangue extracted from the roof, floor and interlayer during mining, and gangue picked out during coal washing. [0003] At present, the amount of gangue discharged from coal mines accounts for about 8% to 20% of the coa...

AI Technical Summary

Problems solved by technology

[0009] At present, pure SiO is used to manufacture porous ceramic membrane separation elements. 2 、Al 2 o 3 , SiC and ZrO 2 As raw materials, first of all, the price of these raw materials is relatively high, and a high temperature is required in the sintering process to produce porous ceramic membrane separation. Combining the influence of the above two factors, the cost of manufacturing porous ceramic membrane separation elements is relatively high

Images