Zeolites based on waste incineration fly ash and preparation methods thereof

A method for preparing a zeolite based on waste incineration fly ash, comprising:

• step (a) subjecting the waste incineration fly ash to acid washing to remove impurities, followed by water washing and drying;
• and
• step (b) adding a mixture of FeCl3 and FeSO4 to washed and dried waste incineration fly ash, followed by mixing with an alkaline solution, putting into a ball milling tank together with grinding balls for a mechanical chemical reaction, and heating reaction materials in a process of ball milling to obtain the zeolite;
• wherein a mass ratio of FeSO4 to FeCl3 in the mixture is 5.5:1 and a mass ratio of the washed and dried waste incineration fly ash to the mixture is (5-10):1;
• a mass ratio of the grinding balls to the washed and dried waste incineration fly ash is (10-20):1, a rotational speed of the ball milling tank is within a range of 300-700 r/min, and a time of the ball milling is within a range of 2-10 h;
• a concentration of the alkaline solution is within a range of 2-4 mol/L and a liquid-solid mass ratio of the alkaline solution to the washed and dried waste incineration fly ash is (3-5):1;
• an acid used in the acid washing is one of acetic acid, propionic acid, butyric acid, succinic acid, and lactic acid, and a concentration of the acid is within a range of 0.2-1 mol/L;
• and
• a mass ratio of silicon to aluminum in the waste incineration fly ash is (1.1-1.5):1.

A method for preparing a zeolite based on waste incineration fly ash, comprising:

• step (a) subjecting the waste incineration fly ash to acid washing to remove impurities, followed by water washing and drying;
• and
• step (b) adding a mixture of FeCl3 and FeSO4 to washed and dried waste incineration fly ash, followed by mixing with an alkaline solution, putting into a ball milling tank together with grinding balls for a mechanical chemical reaction, and heating reaction materials in a process of ball milling to obtain the zeolite;
• wherein a mass ratio of FeSO4 to FeCl3 in the mixture is 5.5:1 and a mass ratio of the washed and dried waste incineration fly ash to the mixture is (5-10):1;
• a mass ratio of the grinding balls to the washed and dried waste incineration fly ash is (10-20):1, a rotational speed of the ball milling tank is within a range of 300-700 r/min, and a time of the ball milling is within a range of 2-10 h;
• a concentration of the alkaline solution is within a range of 2-4 mol/L and a liquid-solid mass ratio of the alkaline solution to the washed and dried waste incineration fly ash is (3-5):1;
• an acid used in the acid washing is one of acetic acid, propionic acid, butyric acid, succinic acid, and lactic acid, and a concentration of the acid is within a range of 0.2-1 mol/L;
• and
• the ball milling tank is a high-temperature ball mill, and a temperature in the ball milling tank is maintained at 100-300° C.