A kind of preparation method and application of modified bentonite
A technology of bentonite and calcium-based bentonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of serious mechanical loss, long time period, long operation, etc., to improve the quality of green pellets, low cost, Simple to use effects
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Embodiment 1
[0034] When modifying natural calcium-based bentonite, first dissolve 200g of commercially available sodium humate with 1.2L of 0.1mol / L NaOH, then add 200g of calcium-based bentonite to it, heat and stir in a water bath at 80°C for 60min, then filter the mixture . The resulting filter cake was dried at 80°C. Then the dried filter cake is crushed and ground to -200 mesh accounting for more than 98% to obtain the modified bentonite.
[0035] When the modified bentonite is used for pelletizing, 1 wt% of the modified bentonite is added to the magnetite concentrate with a particle size of -200 mesh and 85%, and the pelletizing is performed after mixing. The drop strength of the obtained green balls was 5.2 times / 0.5m, and the bursting temperature of the green balls was 595°C. The preheating ball strength is 431N / piece, and the roasting ball strength is 2519N / piece. The finished ductile iron grade is 62.96%.
Embodiment 2
[0037] When modifying natural calcium-based bentonite, first dissolve 200g of commercially available sodium humate with 1.2L of 0.1mol / L NaOH, then add 100g of calcium-based bentonite to it, heat and stir in a water bath at 75°C for 50min, and then dissolve the mixture filter. The resulting filter cake was dried at 75°C. Then the dried filter cake is crushed and ground to -200 mesh accounting for more than 98% to obtain the modified bentonite.
[0038] When the modified bentonite is used for pelletizing, 0.75wt% of the modified bentonite is added to the hematite concentrate with a particle size of -200 mesh and 80-90%, and the pelletizing is performed after mixing. The drop strength of the obtained green balls was 7.2 times / 0.5m, and the bursting temperature of the green balls was 581°C. The preheating ball strength is 437N / piece, and the roasting ball strength is 2519N / piece. The grade of finished ductile iron is 62.73%.
Embodiment 3
[0040] When modifying natural calcium-based bentonite, first dissolve 300g of commercially available sodium humate with 1.2L of 0.1mol / L NaOH, then add 100g of calcium-based bentonite to it, heat and stir in a water bath at 65°C for 45min, and then dissolve the mixture filter. The resulting filter cake was dried at 65°C. Then the dried filter cake is crushed and ground to -200 mesh accounting for more than 98% to obtain the modified bentonite.
[0041] When the modified bentonite is used for pelletizing, 0.5wt% modified bentonite is added to the magnetic and red mixed iron concentrate with a particle size of -200 mesh and 80% to 90%, and the pelletizing is performed after mixing. The drop strength of the obtained green balls was 10.5 times / 0.5m, and the bursting temperature of the green balls was 588°C. The preheating ball strength is 436N / piece, and the roasting ball strength is 2522N / piece. The grade of finished ductile iron is 62.98%.
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