Zeolite adsorbent and its preparation method

Abstract

The invention discloses a zeolite adsorbent and its preparation method, the zeolite adsorbent is powder particles using zeolite as main raw material; it mixes 60-95% zeolite, 30% filler, 1-30% binding agent, 0-20% hole agent and 0-20% acid to prepare colloid which solid content is 10-60%; After spray-dries it, then it roasts power particles which droplet method volume>0.5 ml/g. The exchange capacity is large, it can remove the ammonia nitrogen, calcium magnesium ion, fluorinion or heavy metallic ion in sewage water effectively and reach sewage water emission standard.

Description

1. Technical field: [0001] The invention relates to an adsorbent and a preparation method thereof, in particular to a zeolite adsorbent capable of adsorbing nitrogen ammonium ions, fluorine ions or heavy metal ions in water bodies and a preparation method thereof. 2. Background technology [0002] Ammonia nitrogen is the main pollutant in rivers and lakes. At high concentrations, it can directly poison fish and shrimp in the water body, and also make the water body eutrophic, thereby breeding bacteria and algae, and domestic sewage. Chemical sewage is the main source of ammonia nitrogen. my country has strict standards for the discharge of ammonia nitrogen in sewage. The national primary discharge standard is 15mg / L, and the secondary standard is 50mg / L. In the advanced treatment of ammonia nitrogen, adsorption is one of the effective methods. The adsorbents in the prior art include: activated carbon, activated coal, clay, diatomaceous earth, bentonite, montmorillonite, cla...

AI Technical Summary

Problems solved by technology

[0010] CN86 1 0692 IA uses natural clinoptilolite or mordenite as the main raw material, adds a certain amount of aluminum hydroxide, potassium chloride, sodium hydroxide and water to mix, and then performs complicated and long-term gelation, crystallization and other steps. Synthesize an adsorbent that can be used to adsorb potassium ions or press ions in water, and its preparation process is relatively complicated

[0011] Chinese patent CN1485281A discloses a method of using 13X molecular sieve to treat ammonia nitrogen sewage. The metered 13X molecular sieve is put into the sewage, stirred, left still, filtered, the filtrate is discharged directly, and the filter residue is regenerated with 20% NaCl solution and baked at 105 degrees. Dried to obtain circulating molecular sieve, but the original powder of 13X molecular sieve is too fine, the separation time is long, and filtration is difficult

[0012] Chinese patent CN1611294A discloses a kind of NaY molecular sieve and aluminum hydroxide powder as the main raw materials, which are formed by extruding and roasting at 300-500°C for 4-10 hours to obtain a rod with a diameter of 0.5-2 mm and a length of 1-5 mm. It adopts fixed bed adsorption to treat 2905~4855mg / L ammonia nitrogen sewage, and the dynamic ammonia nitrogen exchange capacity is about 34~38mg / g. At the same time, it can adsorb Ca, Mg and other ions, but the particle diameter is large and the adsorption capacity is low. Fixed bed process, when dealing with large flow of ammonia nitrogen sewage, the amount of one-time regeneration solution is large