Sodalite zeolite synthesized by fly ash and synthesis method thereof

Abstract

The invention discloses a sodalite zeolite synthesized by fly ash and a synthesis method thereof. The method comprises the following steps: mixing fly ash with clean water, stirring and washing until the upper part of the solution is no longer turbid; then filtering; drying at a temperature of 100 to 105 DEG C until the weight does not change; putting the processed fly ash into high-pressure reaction equipment, adding NaOH solution with a concentration of 4 mol / L according to the mass of the processed fly ash, heating to a default effective temperature of 121 DEG C for carrying out dampness-heat reactions in the high-pressure reaction equipment, wherein the pressure reaches 147 kPa; cooling the reaction product, filtering, and drying so as to obtain sodalite zeolite, wherein the product is ball-shaped particles in glassy state, contains single hydroxyl sodalite zeolite, and the diffraction angles of the powder diffraction characteristic peaks are 14.08 degrees, 24.50 degrees, 31.80 degrees, 34.92 degrees, and 43.14 degrees. The sodalite zeolite is used to eliminate ammonia nitrogen in wastewater; the maximum ammonia absorption amount is 11.0477 mg / g, so that the effect is prominent.

Description

technical field [0001] The invention relates to a sodalite zeolite synthesized from fly ash and a method thereof, belonging to the field of solid waste treatment and resource utilization. Background technique [0002] my country's raw coal consumption accounts for more than 70% of primary energy consumption, and nearly 80% of my country's power plants rely on coal for power generation. About 80% of the solids after coal incineration form fly ash in the form of fly ash, while about 20% of the solids form incineration residues. Therefore, the amount of fly ash produced by coal combustion in my country is huge every year. It is estimated that every 4 tons of coal consumed will produce 1 ton of fly ash. In 2000, my country's annual discharge of fly ash was about 160 million tons. In 2009, China's fly ash discharge reached about 375 million tons. "Twelve The annual discharge of fly ash by the end of the fifth year is expected to reach 570 million tons. More than 20 kinds of sub...

AI Technical Summary

Problems solved by technology

The main disadvantage of the industrial raw material synthesis method is that the raw material cost is relatively high, while the fly ash raw material synthesis has a cost advantage

At present, the patent method reported for the synthesis of sodalite from fly ash often adopts a high-temperature alkali fusion-hydrothermal two-step synthesis method, which has many synthesis steps, a long time, and a complicated process. The technical process of ash synthesis sodalite is of great significance

Images