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基于硼铁矿资源综合利用的现状和转底炉珠铁工艺的基本特点,提出了含碳球团还原熔分综合利用硼铁精矿的新工艺。在实验室条件下,以硼铁精矿和碳质还原剂为原料,系统研究了焙烧温度、配碳量(C/O摩尔比)、还原剂种类、熔融保持时间等因素对球团还原熔分过程的影响,以及熔分产物的基本特性。试验结果表明:焙烧温度过高或过低均不利于熔分;提高配碳量有助于缩短还原熔分时间;煤灰熔点对熔分有较大影响;随着熔融保持时间的延长渣中FeO含量降低。优化的工艺参数为:以无烟煤为还原剂,配入量为C/O=1.2,焙烧温度为1400℃,焙烧时间为15 min。此时,渣铁分离彻底,得到含硼元素0.065%的纯净珠铁和B2O3品位为20.01%的富硼渣,珠铁中铁的收得率在96.5%以上,富硼渣中硼的收得率在95.7%以上。经缓冷处理,富硼渣主要由遂安石和橄榄石两相组成,活性达86.46%。含硼珠铁和富硼渣分别是钢铁和硼化工工业的优质原料,该工艺可为我国低品位硼铁矿的综合利用提供一种新思路。
Based on the status quo of comprehensive utilization of the resources of ferroboron and the basic characteristics of the beaded iron process of the rotary hearth furnace, a new process for the comprehensive utilization of boron and iron concentrates by reduction and fusion of the carbonaceous pellets was proposed. Under the laboratory conditions, using boraminic iron concentrate and carbonaceous reducing agent as raw materials, the effects of calcination temperature, C / O molar ratio, the type of reductant and the holding time on the reduction of pellets The impact of sub-process, as well as the basic characteristics of the product melt. The results show that the calcination temperature is too high or too low, which is unfavorable to the fusing fraction. Increasing the fusing amount of carbon helps to shorten the reducing fusing time. The melting point of the fines has a greater influence on the fusing fraction. FeO content decreased. The optimized process parameters are: anthracite as reductant, the dosage of C / O = 1.2, the calcination temperature of 1400 ℃, the calcination time of 15 min. At this moment, the slag and iron are completely separated, pure iron and boron with the content of 0.065% of boron and boron-rich slag with the grade of 20.01% of B2O3 are obtained, the yield of iron in the iron and the iron is above 96.5%, and the yield of boron in the boron- Above 95.7%. After slow cooling treatment, the boron-rich slag mainly consists of two phases of perillaite and olivine, with an activity of 86.46%. Boron-bearing and boron-rich slag are high-quality raw materials for the steel and boron chemical industries, respectively, which provides a new idea for the comprehensive utilization of low-grade ferroboron in China.