Green Synthesis Method and Application of NaP Zeolite Prepared by Coal Gasification Coarse Slag from Ningdong, China

Abstract

In view of the current and urgent environmental protection needs, the use of industrial solid waste in China’s Ningdong is becoming more and more important. In this paper, NaP zeolite with good physical properties is synthesized by using coal gasification coarse slag (CGCS) as the raw material, without the addition of a silicon and aluminum source, without the addition of a template agent, and without high-temperature calcination. Add a small amount of NaOH and deionized water to the CGCS to adjust the molar ratio to SiO2:Al2O3:Na2O:H2O = 5.2:1.0:5.0:100. The effects of aging time, crystallization temperature, and crystallization time parameters on synthetic zeolite were studied. The raw materials and the obtained zeolite were tested by XRF, XRD, SEM, FT-IR, TG-DSC, BET, and other technologies. The results show that the specific surface area of the synthesized NaP zeolite can reach 161.06 m2/g, which has the characteristics of large specific surface area, regular morphology, and high crystallinity. We obtained NaP zeolite through a simple and low-cost synthesis method. The synthesized NaP zeolite was used to simulate the removal of ammonia nitrogen in wastewater, and the optimal removal rate was 92.67%. Among them, Na+ plays an important role in the synthesis of NaP zeolite and ion exchange with NH4+. Our research provides new ideas for solving the large-scale accumulation of CGCS and treating ammonia nitrogen in industrial wastewater. Thus, it is a promising green environmental protection and “treating waste by waste” route.

Conversion of silica by-product into zeolites by thermo-sonochemical treatment

“…7 , a, b). This shape of particles is typical of Na-P zeolite [25] , [26] , [27] . In addition to the particles of Na-P zeolite there are typical particles of Na-X zeolite.…”

Chemical Composition Changes during the Commercial Entrained-Flow General Electric and Gaskombinat Schwarze Pumpe Coal Gasification Processes

“…(A, B) Comparison of the major element contents in the GE and GSP coal gasification residues and previous research (Chen et al, Lee et al, Li et al, Liu et al, Guo et al, Ji et al, Luo et al, and Zhang et al).…”

“…The average contents of the major elements in the GE and GSP coal gasification residues were compared to that from some of the others’ research ,,, published in the past 2 years (Figure ). The GE-CR had lower contents of Si and Al but higher Ca and Fe when compared to others’ data. ,,, For the GSP-CR, the Si content was higher than that from others’ research and the Al content was almost equivalent.…”

APLICACIÓN DE UN DISEÑO EXPERIMENTAL EN LA SÍNTESIS HIDROTERMAL DE ZEOLITA Gis-NaP A PARTIR DE RESIDUOS DE LADRILLO

“…[27] mencionan que a altas temperaturas se logra una alta cristalinidad de fase zeolítica debido a una completa reacción entre el NaOH y las fases sólidas presentes en el material inicial. A ésta temperatura se consigue una total disolución de Si y Al, presentes en el precursor y se asegura una alta formación de zeolita NaP [28,29].…”