Production process parameters are:
Pouring calcium metal granules 43 ℃, mold is 4.20m × 1.20m × 0.6m, surface Baotou 5% water feed ratio was 0.62. Determined by trial production with the ratio of:
m (cement): m (lime): m (fly ash): m (gypsum) = 8:24:65:3;
3, calcium silicon ratio calculation method:
C / S = ((8 × 59.37% +24 × 71.5% +65 × 2.6% +3 × 30%) / 56) / ((8 × 22.7% +24 × 5.5% +65 × 46.2%) / 60) = 0.76
56 and 60, respectively, calcium oxide, silicon dioxide molar mass [1]
4, the production of aerated concrete optimal calcium silicon ratio range:
① cement - lime - fly ash aerated concrete series of 0.75 to 0.80
② cement - lime - sand aerated concrete range from 0.64 to 0.68;
③ cement - lime - metal tailings aerated concrete series of 0.55 to 0.62.
5, in the actual production of aerated concrete, when the mixing ratio of calcium silicon ratio is less than optimal calcium silicon ratio, with the strength of the products (cement, lime) to increase the amount of binder increased. When the mixing ratio of calcium silicon ratio greater than optimal calcium silicon, continue to increase the amount of binder strength products are no longer rising even decline.
Black silicon carbide is quartz sand, petroleum coke and quality silica as the main raw material in electric arc furnace smelting. Its hardness between corundum and diamond, the mechanical strength is higher than corundum, brittle and sharp. Black silicon carbide SiC containing approximately 98.5% higher than its toughness green silicon carbide, mostly for processing low tensile strength of the material, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
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