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试验室研究结果表明,含钠浸钒球团还原粉化是在低温还原时,Fe_2O_3向Fe_3O_4转变阶段因内应力积累而引起Fe_3O_4晶粒开裂所造成的。提高开始还原温度能有效地防止球团粉化。 在北方流程第二次中间试验中,采用窑头喷煤高温还原技术,解决了含钠浸钒球团还原粉化问题,粉化率只有2.55%,并取得了金属化率为92.33%。金属化球团含硫0.023%和煤耗0.807t/t产品的较好试验结果。
The results of the laboratory tests show that the reduction and pulverization of sodium-containing vanadium-bearing pellets is caused by the internal stress accumulation during the transition from Fe 2 O 3 to Fe 3 O 4 during the low-temperature reduction, resulting in the cracking of Fe 3 O 4 grains. Increasing the temperature at the beginning of the reduction can effectively prevent the pellets from pulverizing. In the second intermediate test in the northern process, the kiln head pyrolyzed coal was used to solve the problem of reducing and pulverizing sodium-containing vanadium-bearing pellets with a pulverization rate of only 2.55% and a metallization rate of 92.33%. Metallized pellets contain 0.023% sulfur and 0.807t / t of coal products, the better test results.