Method for preparing potassium alum with aluminum-contained waste catalyst generated from petrochemical production
A catalyst and a technology of potassium alum, which is applied in the field of preparing potassium alum from aluminum-containing waste catalysts, can solve problems such as potassium alum that have not been seen before, and achieve the effects of simple process steps, saving resources, and reducing the cost of three wastes treatment
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Embodiment 1
[0025] A) Prepare the aluminum sulfate leaching solution, which comes from petrochemical enterprises, that is, from petrochemical enterprises in the production process such as the catalytic cracking process, and is introduced into an oven and dried at 115 ° C for 8 hours and then dried to a moisture content of 4%. The waste catalyst containing aluminum with a mass % content of 30% is put into a reactor with a heating device and a stirring device, and sulfuric acid with a mass % specific concentration of 23% is added to the reactor, and the heating temperature of the heating device is 120 ° C And the stirring speed of the stirring device is 400r / min under stirring reaction 15h, control the Al in the reaction system 3+ with SO 4 2- The mol ratio is 1: 1.5, obtains aluminum sulfate leaching solution;
[0026] B) To prepare crude potassium alum filter cake, put the aluminum sulfate leaching solution obtained in step A) into the reaction kettle and add saturated potassium sulfate...
Embodiment 2
[0030] Only change the temperature and drying time of the oven in step A) to 125°C and 6h respectively, change the moisture content of the dried aluminum-containing waste catalyst to 3%, and change the mass % content of aluminum in the aluminum-containing waste catalyst to 20 %, the mass % ratio concentration of sulfuric acid was changed to 40%, the heating temperature was changed to 85°C, the stirring speed was changed to 415r / min, the stirring reaction time was changed to 5h, Al 3+ with SO 4 2- Change the mol ratio of 1:1.6; only change the heating temperature of the reactor described in step B) to 90°C, change the stirring speed of the stirring device to 480r / min, change the stirring reaction time to 0.5h, and change K + 、Al 3+ and SO 4 2- The molar concentration ratio of the three is changed into 1.2: 1: 2.07, the cooling crystallization temperature is changed into 8 ℃, the filter pressure is changed into 0.8MPa, and the water content of the thick potassium alum filt...
Embodiment 3
[0033] Only change the temperature and drying time of the oven in step A) to 118°C and 7h respectively, change the moisture content of the aluminum-containing waste catalyst to 2.5% after drying, and change the mass % content of aluminum in the aluminum-containing waste catalyst to was 25%, the mass % specific concentration of sulfuric acid was changed to 16%, the heating temperature was changed to 100°C, the stirring speed was changed to 450r / min, the stirring reaction time was changed to 18h, and the Al 3+ with SO 4 2- Change the mol ratio of 1:1.4; only change the heating temperature of the reactor described in step B) to 88°C, change the stirring speed of the stirring device to 400r / min, change the stirring reaction time to 2h, and change the K + 、Al 3+ and SO 4 2- The molar concentration ratio of the three is changed into 1.5: 1: 2.06, the cooling crystallization temperature is changed into 7 DEG C, the filter press pressure is changed into 0.85MPa, and the water con...
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