Cold briquetting and pelletisation
A pelletizing and pelletizing technology, applied in the direction of process efficiency improvement, sustainable waste treatment, solid waste management, etc., can solve the problems of increasing harmful impurities, polluting air, unsatisfactory performance of briquettes and pellets, etc.
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Embodiment 1
[0073] 3.600 kg of iron ore (grain size up to 6.3 mm), 0.4 kg of iron-rich mineral binder (10% by mineral basis) and 0.130 liters of water [water / binder ratio (W / B) 0.32] in a drum Mix in mixer for 5 minutes. Then 2 kg of the green mixture each time were used to produce cylindrical compacts with a diameter of 30 mm under a pressing load of 0.5 and 5 tons. To maintain the same briquette weight, 55 grams of green mix was used per briquette. Thus, 30 briquettes were produced under a load of 0.5 ton (compression ratio 0.70) and a load of 5 ton (compression ratio 0.60). The two briquette samples were water-cured in atmospheric air after 12 hours for up to 20 days for binder hydration and cold strength improvement. The cold bond strength of the briquette increases with time and binder hydration rate. Within 20 days, the adhesive reached almost 90% hydration strength, and reached equilibrium strength within 90 days. Briquettes made under 0.5 ton and 5.0 ton compressive loads achi...
Embodiment 2
[0075] Mix 1.680 kg iron ore (grain size up to 4 mm), 0.160 kg coke powder (grain size up to 0.5 mm), 0.160 kg iron-rich mineral binder (8% by weight), 70 ml water and 2 ml surfactant The agent was mixed in the pan for 5 minutes. The green mixture was briquetted under a compression load of 3 tons to produce cylindrical briquettes with a diameter of 30 mm at a compression ratio of 0.62. Use 50 grams of the mixture per briquette. Twenty briquettes were prepared from the above mixture and then cured in water for 28 days. After 1, 3, 7, 14, 21, and 28 days of water curing, the coke-containing composite iron ore briquettes reached an average cold crushing strength of 6.4, 13.0, 18.6, 23.5, 25.8, and 27.0 MPa, respectively.
Embodiment 3
[0077] 2.000 kg of BOF powder (particle size up to 1 mm), 0.800 kg of scale (particle size up to 3.0 mm), 0.800 kg of iron ore (particle size up to 2 mm), 0.400 kg of iron-rich mineral binder (by weight, 10%), 120 ml of water and 5 ml of surfactant were mixed in a drum mixer for 5 minutes. 2 kg of green mix was used at a time to produce cylindrical briquettes with a diameter of 30 mm under a compression load of 4 and 5 tons. The weight of green mix used per briquette was 45 grams. Therefore, 40 briquettes of each were prepared under 4 ton and 5 ton loads and then cured in water for 28 days. The briquettes made under the compression load of 4 tons and 5 tons were cured in water for 1, 3, 7, 14, 21 and 28 days to reach 5.5, 13.5, 18.5, 22.0, 24.4 and 26.2 MPa and 8.0, 16.3, Average cold crush strengths of 21.5, 25.0, 26.8 and 28.5 MPa.
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