(5) Preparation example
①Preparation of activated carbon with wood as raw material Two kinds of coniferous fir and masson pine in southern China and two broad-leaved paulownia and poplar in the north as raw materials, using zinc chloride as activator, and using different processes to prepare activated carbon
The process of preparing activated carbon is as follows:
Raw material → sieving → zinc chloride impregnation → carbon activation → zinc chloride recovery → pickling → rinsing → drying → crushing
Main process parameters: sawdust drying air temperature is 280℃, after drying sawdust moisture 28%-30%; zinc chloride concentration (in °Be) is 45 (pH1), 48 (pH2) and 53 (pH2.
5) ° Be; zinc chloride dipping sawdust time 8h, temperature 28-30℃; carbon activation time 2h, carbon activation end temperature 650℃; pickling vapor pressure 0.
2MPa, pickling time 1h; activated carbon crushing fineness 0.
08mm sieve passed 80%
The ratio of zinc chips after mixing sawdust and zinc chloride at 45°Be is 1.
5:1; the ratio of zinc chips after mixing sawdust and zinc chloride at 48°Be is 1.
8:1; and at 53°Be the zinc chip ratio is mixed with zinc chloride.
The chip ratio is 2.
The main performance test results of activated carbon prepared under different process conditions are shown in Table 4-31
Table 4-31 The main performance test results of activated carbon prepared under different process conditions