Method for preparing expandable graphite by using ozone
An expanded graphite and ozone technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of unfavorable acid recycling, reduction of oxidant consumption, heavy metal ion pollution, etc. The effect of environmental pollution and simple equipment and process
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Embodiment 1
[0020] The preparation method of expandable graphite, put 10 grams of 50 mesh natural flake graphite in a 500ml measuring cylinder; add 200ml of concentrated sulfuric acid with a mass fraction of 98% to form a graphite intercalant mixture; Put the pipette into the mixed solution of graphite intercalation agent for oxidative intercalation, continue mechanical stirring at about 25°C, react for 30 hours, suction filter and wash with water until the pH of the filtrate is 6-7; dry in an oven at 50°C After 48 hours, expandable graphite was obtained. According to the method specified in GB 10698-89 "Expandable Graphite", the expansion volume measured in a resistance furnace at 950°C is 240 ml / g. Among them, the ozone generator used is OZ-3G type, industrial oxygen gas source, oxygen flow rate is 5 liters / hour, and the ozone concentration adjustment knob is adjusted to 100%.
Embodiment 2
[0022] The preparation method of expandable graphite is that 5 grams of 50 mesh natural flake graphite is placed in a 500ml graduated cylinder; 180ml of concentrated sulfuric acid with a mass fraction of 98% and 20ml of nitric acid with a mass fraction of 65% are added to form a mixed solution of graphite intercalation agent; Through an ozone generator, directly pass ozone into the graphite intercalation agent mixture through a glass straw for oxidative intercalation, and continuously mechanically stir at about 15°C. After reacting for 21 hours, suction filter and wash with water until the pH of the filtrate is 6-7 ; Dry in an oven at 50° C. for 48 hours to obtain expandable graphite. According to the method specified in GB 10698-89 "Expandable Graphite", the expansion volume measured in a 900°C resistance furnace is 208 ml / g. Among them, the ozone generator used is OZ-3G type, industrial oxygen gas source, oxygen flow rate is 5 liters / hour, and the ozone concentration adjustm...
Embodiment 3
[0024] The preparation method of expandable graphite is that 5 grams of 50 mesh natural flake graphite is placed in a 500ml graduated cylinder; 180ml of concentrated sulfuric acid with a mass fraction of 98% and 20ml of formic acid with a mass fraction of 88% are added to form a mixed solution of graphite intercalation agent; Through an ozone generator, directly pass ozone through a glass straw into the graphite intercalation agent mixture for oxidative intercalation, continue mechanical stirring at about 15°C, react for 22 hours, suction filter and wash with water until the pH of the filtrate is 6-7 ; Dry in an oven at 50° C. for 48 hours to obtain expandable graphite. According to the method specified in GB 10698-89 "Expandable Graphite", the expansion volume measured in a 900°C resistance furnace is 216 ml / g. Among them, the ozone generator used is OZ-3G type, industrial oxygen gas source, oxygen flow rate is 5 liters / hour, and the ozone concentration adjustment knob is adj...
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