Modified slag powder and preparation method thereof
A technology of slag powder and modification, which is applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc. The effect of improving performance indicators and promoting application value
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[0031] Example 1
[0032] Heat the calcium silicate slag obtained by the method described in CN103332710A (the same below): dry the calcium silicate slag with hot air at 105°C to remove moisture, and then burn it at 600°C for 100 minutes to obtain the heat-treated calcium silicate slag;
[0033] According to mass parts, 54 parts of heat-treated calcium silicate slag, 10 parts of fly ash, 30 parts of slag, 5 parts of desulfurized gypsum, 0.15 parts of CGA, AS cement grinding aid and 0.85 parts of potassium sulfate and carbonic acid The sodium mixture is mixed and milled by tube mill for 20 minutes to prepare modified slag powder with a specific surface area of 520m 2 / kg.
[0034] After testing, the final modified slag powder produced has a fluidity ratio of 103%, a 28-day activity index of 109%, a chloride ion content of 0.04%, and a sulfur trioxide content of 2.5%, which fully meets GB / T 18046- Requirements of S105 slag powder in 2008.
Example Embodiment
[0035] Example 2
[0036] Burn the silicon-calcium slag at 300°C for 120 minutes to obtain the heat-treated silicon-calcium slag;
[0037] According to mass parts, 60 parts of heat-treated calcium silicate slag, 15 parts of fly ash, 20 parts of slag, 4 parts of desulfurized gypsum, 0.1 parts of TM, CAS, ZM cement grinding aid and 0.9 parts of sodium phosphate , After grinding by tube mill for 20 minutes, it is prepared into modified slag powder with a specific surface area of 420m 2 / kg.
[0038] After testing, the final modified slag powder produced has a fluidity ratio of 102%, a 28-day activity index of 96%, a chloride ion content of 0.04%, and a sulfur trioxide content of 2.6%, which fully reaches GB / T 18046- S95 slag powder requirements in 2008.
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