Study on Synthesis of Molecular Sieve from Potash Feldspar Calcined by KOH at Medium Temperature
Source abstract
Abstract
In this paper, high value-added molecular sieves were prepared by extracting valuable components from low-temperature burned potassium feldspar with KOH as additive to make full use of potassium feldspar. At first, the best roasting conditions for extracting SiO2 from potassium feldspar by KOH medium temperature roasting are determined by single factor experiment: roasting temperature is 500℃, roasting time is 2.5 h, alkali-ore ratio is 2.5:1, and the dissolution rate of SiO2 can reach 99%. Through orthogonal experiment, the relationship of the three factors affecting the dissolution rate of SiO2 are: alkali-ore ratio, roasting temperature and time. Through kinetic analysis, the reaction process is a mixed control of chemical control and diffusion control, and the kinetic equation is [1 − (1 − α)1/3] = 5.1872exp[− 8832.72/(RT)]t. Finally, the W-type molecular sieve with pore volume of 0.013181 cc/g, specific surface area of 2.476 m2/g and moisture absorption rate of 6.06% is synthesized by hydrothermal method.
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Research context
OpenAlex topics: Zeolite Catalysis and Synthesis · Coal Properties and Utilization · Adsorption and biosorption for pollutant removal
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
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