CAJ | 학술논문

针对难处理的鲕状高磷铁矿,提出了首先采用高气化性生物质木炭制备含碳球团,然后通过直接还原-高温熔分的方法,成功实现了该铁矿的除磷提铁.直接还原实验采用管式炉.考察了还原温度、生物质木炭加入比例(碳氧摩尔比)和气氛等条件对样品还原行为的影响,并确定了适宜的还原条件为温度1373 K、配碳量0.9、时间15~25 min以及气氛PCO2/PCO =1：1.在此条件下,样品的金属化率和残碳质量分数分别在75%~80%和0.69%~0.11%的范围内.通过对该金属化球团的X射线衍射和扫描电镜-能谱分析发现：还原后样品中的主要物相为金属铁、磷灰石和硅酸三钙；磷没有被还原而仍以磷灰石的形式存在于脉石中.高温熔分实验采用Si-Mo棒高温箱式炉.实验结果得到磷质量分数为0.4%的铁样.在熔分体系中进一步添加相对质量为2%~4%的Na2 CO3,可以得到磷质量分数在0.3%以下的铁样.基于以上分析,证明了采用生物质木炭用于高磷铁矿的除磷提铁是可行的.
침대난처리적이상고린철광,제출료수선채용고기화성생물질목탄제비함탄구단,연후통과직접환원-고온용분적방법,성공실현료해철광적제린제철.직접환원실험채용관식로.고찰료환원온도、생물질목탄가입비례(탄양마이비)화기분등조건대양품환원행위적영향,병학정료괄의적환원조건위온도1373 K、배탄량0.9、시간15~25 min이급기분PCO2/PCO =1：1.재차조건하,양품적금속화솔화잔탄질량분수분별재75%~80%화0.69%~0.11%적범위내.통과대해금속화구단적X사선연사화소묘전경-능보분석발현：환원후양품중적주요물상위금속철、린회석화규산삼개；린몰유피환원이잉이린회석적형식존재우맥석중.고온용분실험채용Si-Mo봉고온상식로.실험결과득도린질량분수위0.4%적철양.재용분체계중진일보첨가상대질량위2%~4%적Na2 CO3,가이득도린질량분수재0.3%이하적철양.기우이상분석,증명료채용생물질목탄용우고린철광적제린제철시가행적.
A method of phosphorus removal was proposed to process oolitic high-phosphorus iron ore. It is an integration of direct reduction and melting separation with carbon-containing pellets prepared with high-reactivity biomass char. Direct reduction experi-ments were performed in a tubular furnace, and three parameters were investigated, i. e. , reduction temperature, biomass char adding ratio ( carbon-to-oxygen molar ratio) and atmospheres. The optimum condition was determined to be the reduction temperature of 1373 K, the biomass adding ratio of 0. 9, the PCO2/PCO value of 1:1, and the reduction time of 15 to 25 min. Under this condition, the met-allization rate and the residual carbon content of reduced samples are 75% to 80% and 0. 69% to 0. 11%, respectively. SEM-EDS and XRD examination of reduced samples obtained under the optimum condition shows that the major phases are metallic iron, calcium sili-cate and calcium phosphate, but phosphorus still remains in gangue. Subsequent melting separation experiments were conducted in a Si-Mo high-temperature furnace. Metal with the phosphorus content of some 0. 4% was obtained from the reduced samples;and further-more, metal with the phosphorus content of less than 0. 3% could be obtained after introducing 2% to 4% Na2 CO3 into the melting sys-tem. Based on the above analysis, the feasibility of applying biomass char for phosphorus removal is demonstrated.