Refractory low-grade iron ore shaft furnace semi-coke added magnetizing roast process
A magnetized roasting and iron ore technology, which is applied in the field of metallurgy and mineral engineering, can solve the problems of lagging and leading, low calorific value, and low quality of output products, so as to reduce the amount of reducing gas, increase the concentration of reducing medium, and improve metal recovery. rate effect
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[0027] Attached below figure 1 To 100m 3 A small block shaft furnace, using coal gas heating as an example, is a further detailed description of a difficult-to-select low-grade iron ore shaft furnace with garland charcoal magnetized roasting process.
[0028] 1. Material selection
[0029] Refractory low-grade iron ore: specularite (composed of hematite, limonite and siderite) with a grain size of 15-50mm and an iron grade of 31-35%;
[0030] Blue charcoal: the fixed carbon content is 72 to 76%, the ash content is 11 to 15%, the volatile content is 10 to 14%, and the particle size is 15 to 30 mm;
[0031] Gas for heating and reduction: high coke mixed gas.
[0032] 2. Preheating of iron ore
[0033] The iron ore with a particle size of 15-50mm and blue charcoal with a particle size of 15-30mm are mixed in a mass ratio of 100: 2-5, mixed evenly and then added from the top of the shaft furnace. The iron ore depends on its own gravity from the top Under flow, the mixture material in the s...
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