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生物質木炭用于鮞狀高磷鐵礦除磷

Phosphorus removal of oolitic high-phosphorus iron ore using biomass char

  • 摘要: 針對難處理的鮞狀高磷鐵礦,提出了首先采用高氣化性生物質木炭制備含碳球團,然后通過直接還原-高溫熔分的方法,成功實現了該鐵礦的除磷提鐵.直接還原實驗采用管式爐.考察了還原溫度、生物質木炭加入比例(碳氧摩爾比)和氣氛等條件對樣品還原行為的影響,并確定了適宜的還原條件為溫度1373 K、配碳量0.9、時間15~25 min以及氣氛PCO2/PCO=1:1.在此條件下,樣品的金屬化率和殘碳質量分數分別在75%~80%和0.69%~0.11%的范圍內.通過對該金屬化球團的X射線衍射和掃描電鏡-能譜分析發現:還原后樣品中的主要物相為金屬鐵、磷灰石和硅酸三鈣;磷沒有被還原而仍以磷灰石的形式存在于脈石中.高溫熔分實驗采用Si-Mo棒高溫箱式爐.實驗結果得到磷質量分數為0.4%的鐵樣.在熔分體系中進一步添加相對質量為2%~4%的Na2CO3,可以得到磷質量分數在0.3%以下的鐵樣.基于以上分析,證明了采用生物質木炭用于高磷鐵礦的除磷提鐵是可行的.

     

    Abstract: 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 experiments 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 metallization 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 silicate 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 furthermore, metal with the phosphorus content of less than 0.3% could be obtained after introducing 2% to 4% Na2CO3 into the melting system. Based on the above analysis, the feasibility of applying biomass char for phosphorus removal is demonstrated.

     

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