Method for preparing alumina-based porous mineral material

Abstract

The invention discloses a method for preparing an alumina-based porous mineral material, which comprises the following steps of: grinding kaolinite with the purity of not less than 90 percent into 70 to 80 mass percent of fine particles with the particle size of -100 meshes; calcining the kaolinite fine particles at the high temperature of between 1,050 and 1,150 DEG C for 10 to 30 minutes; extracting silica from the calcined kaolinite by using 100 to 140g / L sodium hydroxide solution in a solid-liquid mass ratio of 1:8-1:12 at the temperature of between 90 and 140 DEG C for 90 to 120 minutes with stirring; and performing solid-liquid separation, and drying the obtained solid to obtain the alumina-based porous mineral material which has a good effect of adsorbing heavy metal ions in solution. The alumina-based porous mineral material prepared by the method is prepared from natural minerals with wide sources and large resource reserves, can be used for treating heavy metal ion polluted wastewater, and has a wide application prospect in the environment-friendly industry, and the preparation process is simple, and low in cost.

Description

technical field

[0001] The invention relates to a preparation method of an alumina-based porous mineral material, in particular to a method for preparing an alumina-based porous mineral material using kaolinite as a raw material for treating waste water polluted by heavy metal ions. Background technique

[0002] With industrial progress and social development, the problems of water pollution and soil pollution are becoming more and more serious. At least 100 million t / d of sewage in cities and towns across the country is directly discharged into water bodies without treatment, the water quality of more than half of the seven major river systems is polluted, 1 / 3 of the country's water bodies are not suitable for fish, and 1 / 4 of It is not suitable for irrigation, 90% of urban waters are seriously polluted, 50% of urban water sources do not meet drinking water standards, 40% of water sources are undrinkable, and 60% to 70% of the total water shortage in southern cities is caus...

Images