Acid leaching ion exchange method for comprehensively using waste denitration catalyst
A denitrification catalyst and ion exchange technology, which is applied in the field of comprehensive utilization of waste denitrification catalysts, can solve the problems of waste of effective resources, increased costs, environmental hazards, etc., and achieve the effect of comprehensive utilization
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Embodiment 1
[0022] (1) Add sulfuric acid solution and sodium sulfite with a mass fraction of 40% to the waste denitration catalyst crushed to an average particle size of 0.15 mm, the mass ratio of sulfuric acid solution to waste denitration catalyst is 2.0, the mass ratio of waste denitration catalyst to sodium sulfite is 200, and heat to Boil and continue for 2 hours, filter to obtain filtrate a and filter residue b;
[0023] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid process titanium dioxide production; add sodium chlorate to the filtrate a, the mass ratio of waste denitrification catalyst to sodium chlorate is 100, add sulfuric acid to adjust the pH of the solution to 3.0, heat and boil until the solution turns yellow , and then the solution was cooled to 15°C;
[0024] (3) Pass the cooled solution through the 717 ion exchange resin column, the flow rate is controlled at 0.03 mL / min·mL, and then use NaOH+NaCl solution as the eluent to rinse the 7...
Embodiment 2
[0028] (1) Add sulfuric acid solution and potassium sulfite with a mass fraction of 50% to the waste denitration catalyst crushed to an average particle size of 0.25 mm, the mass ratio of sulfuric acid solution to waste denitration catalyst is 3.0, and the mass ratio of waste denitration catalyst to potassium sulfite is 300, heated to boiling and continued for 2 hours, filtered to obtain filtrate a and filter residue b;
[0029] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid titanium dioxide production; add potassium chlorate to the filtrate a, the mass ratio of waste denitrification catalyst to potassium chlorate is 200, add sulfuric acid to adjust the pH of the solution to 4.0, heat and boil until the solution turns yellow, and then dissolve the solution Cool to 35°C;
[0030] (3) Pass the cooled solution through the 717 ion exchange resin column, the flow rate is controlled at 0.06 mL / min·mL, and then use NaOH+NaCl solution as the eluent ...
Embodiment 3
[0034] (1) Add hydrochloric acid solution and sodium bisulfite with a mass fraction of 45% to the waste denitration catalyst crushed to an average particle size of 0.30 mm, the mass ratio of hydrochloric acid solution to waste denitration catalyst is 4.0, and the mass fraction of waste denitration catalyst and sodium bisulfite Ratio is 350, heated to boiling and continued for 2 hours, filtered to obtain filtrate a and filter residue b;
[0035] (2) Transport the filter residue b to the raw material warehouse for sulfuric acid titanium dioxide production; add sodium chlorate to the filtrate a, the mass ratio of waste denitrification catalyst to sodium chlorate is 250, add hydrochloric acid to adjust the pH of the solution to 3.0, heat and boil until the solution turns yellow , and then the solution was cooled to 15°C;
[0036] (3) Pass the cooled solution through the 901 ion exchange resin column, the flow rate is controlled at 0.09 mL / min mL, and then use NaOH+NaCl solution as...
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