Method for preparing molecular sieve by taking oxidized stone as raw material

Abstract

The invention discloses a method for preparing a molecular sieve by taking oxidized stone as a raw material. The method comprises the particular steps of: (1) mixing light opal and sodium hydroxide according to a certain proportion, roasting and activating, (2) grinding a roasted product obtained by roasting, mixing with water, or directly mixing with the water into a mixed solution, filtering the mixed solution to form filtrate or carrying out no filtration, adjusting a silicon-aluminum atom mole ratio of the mixed solution or the filtrate to 2.5-6.0 by adding or not adding aluminum sulfate, (3) crystallizing the mixed solution or the filtrate with the satisfactory silicon-aluminum atom mole ratio prepared in Step (2), and (4) after pretreatment, treating a zeolite filter column filled with the molecular sieve for water power retention time of 1.5h to be capable of reducing an ammonia nitrogen content in the water from 20.1mg / L to 0.02mg / L, wherein the molecular sieve is a P-type zeolite molecular sieve and has the purity of above 90%. The molecular sieve has particularly strong selective absorbability, very high purity and has a good effect of synchronous removal of nitrogen and phosphorus.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves, in particular to a method for preparing molecular sieves by using rock oxide as a raw material, and belongs to the technical field of molecular sieves. Background technique [0002] Opal is produced in Henan, Shaanxi, Yunnan, Anhui, Jiangsu, and Heilongjiang in my country. Opal is a natural hardened silica gel containing 5-10% water; opal is different from most gemstones and is amorphous. Due to the loss of water in the gemstone, it gradually dries up and cracks appear; opal belongs to the opal class in mineralogy, and is a gemstone with a color-changing effect. It is a water-containing amorphous silica; its ore has a high porosity. Strong water absorption, good adsorption, can adsorb toxic and harmful substances or elements such as chloride, nitrite, cyanide, Pb and Hg, and has good decolorization and bleaching performance, and can also release negative ions, which can be directly applied...

AI Technical Summary

Problems solved by technology

[0002] Opal is produced in Henan, Shaanxi, Yunnan, Anhui, Jiangsu, and Heilongjiang in my country. Opal is a natural hardened silica gel containing 5-10% water. Unlike most gemstones, opal is amorphous. Due to the loss of water in the gemstone, it gradually dries and cracks appear; opal belongs to the opal class in mineralogy, and is a gemstone with a color-changing effect. It is a water-containing amorphous silica; its ore has a high porosity. Strong water absorption, good adsorption, can adsorb toxic and harmful substances or elements such as chloride, nitrite, cyanide, Pb and Hg, and has good decolorization and bleaching performance, and can also release negative ions, which can be directly applied to coatings , ink, and made into polymer / opal powder composite materials, which are widely used in many fields such as chemical industry, textile, medical care, environmental engineering, nanocomposites, etc., but there is no application of synthetic molecular sieves; currently, artificially synthesized molecular sieves are usually Prepared with industrial raw materials such as sodium silicate, the source of raw materials is limited, and the cost is huge