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针对高磷鲕状赤铁矿石矿物结构复杂导致的脱磷困难现状,为实现深度脱磷的目的,探索矿物还原过程中磷的形态及微观脱磷过程。以铁品位为44.78%、磷的质量分数为0.92%的高磷鲕状赤铁矿为研究对象,根据其面扫描电镜及矿相结构图可知,矿物之间嵌布紧密、逐层形成鲕状结构,石英、鲕绿泥石与赤铁矿等互相包裹,磷元素集中分布在鲕粒内部的氟磷灰石中。通过对焙烧产物做扫描电镜(SEM)及能谱分析(EDS),对高磷鲕状赤铁矿脱磷机理进行研究。研究结果表明,当YM-1脱磷剂质量分数为16%,还原过程中鲕状结构被破坏,金属铁逐渐从鲕粒中析出聚集,脉石与铁颗粒分离明显,磷化为不同形态被脱除。磁选后尾矿、铁分离完全,磷元素几乎全部进入尾矿,添加复合脱磷剂YM-1焙烧磁选后铁精矿的铁品位为90.16%,铁回收率为91.25%,磷质量分数为0.056%,脱磷率为93.91%。铁精粉各项指标满足工业冶炼要求。 相似文献
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高磷鲕状赤铁矿铁磷分离试验研究 总被引:1,自引:0,他引:1
对高磷鲕状赤铁矿进行了显微结构研究,采用添加脱磷剂直接还原焙烧-磁选工艺进行了铁和磷分离试验,研究了焙烧温度、内配碳量、添加剂配比对铁、磷分离主要技术指标的影响。结果表明:磷主要以磷灰石的形态嵌布在鲕状结构中,部分与赤铁矿形成环状间层,层间的厚度变化范围在3~15μm之间;在焙烧温度1 000℃、内配碳量6%、添加剂配比10%的优化工艺条件下,通过球磨-磁选试验可得到含铁品位大于85%、含磷量在0.15%~0.20%之间的优质还原铁粉和含磷为3.5%~4%的富磷渣。 相似文献
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为最大限度地利用恩施黑石板地区的铁矿资源,先通过XRD、扫描电镜、金相显微镜等手段研究了它的矿相组成和结构,得知其主要成分是赤铁矿和石英,矿的显微结构以鲕粒群簇为主,鲕粒中赤铁矿与磷灰石呈环带状分布。矿相结构决定了用一般的选矿方法分离铁、磷非常困难,为此用实验室煤基直接还原法研究了还原温度、还原时间、煤种、添加剂、磁选工艺等对精矿中铁品位和铁回收率的影响规律,得到了提高还原率的合理工艺参数:以哈密煤为还原剂,焙烧还原温度1573K,还原时间40min,一段磨矿时间15min,磁场强度280kA/m。采用此工艺可使精矿产率、铁品位、铁回收率分别达到43.21%、 95.77%和92.18%,磷品位由0.76%降至0.097%。该研究为该地区高磷鲕状赤铁矿工业化的开发利用提供了依据。 相似文献
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《钢铁》2018,(11)
高磷鲕状赤铁矿的还原对磁选分离起着重要作用,为鲕状赤铁矿合理利用开发提供理论依据。以高磷鲕状赤铁矿为原料、H2为还原剂,研究添加CaO对高磷鲕状赤铁矿还原的影响。研究结果表明,温度为1 100℃、碱度为1.0时,金属化率达到92.05%。XRD、SEM-EDS分析表明,添加CaO使绝大部分铁氧化物被还原为金属铁,有效促进铁橄榄石(Fe2SiO4)、铁尖晶石(FeAl2O4)还原成铁,金属铁颗粒中的杂质组分降低。动力学结果表明,原矿温度为800~1 100℃时符合未反应核模型,未添加CaO原矿表观活化能为49.16 kJ/mol,添加CaO原矿表观活化能为56.46 kJ/mol。两还原过程都受气体扩散控制。 相似文献
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Hongliang Han Dongping Duan Xing Wang Siming Chen 《Metallurgical and Materials Transactions B》2014,45(5):1634-1643
This study puts forward a new method to separate phosphorus and iron from high-phosphorus oolitic hematite through iron nuggets process. Firstly, the physical, chemical, and microscopic characteristics of high-phosphorus oolitic hematite are investigated. Then, the reaction mechanisms of high-phosphorus hematite together with feasibility to separating phosphorus and iron by iron nugget process are discussed. Meanwhile, the experiments of high-phosphorus hematite used in rotary hearth furnace iron nugget processes are studied as well. The results indicate that the iron nugget process is a feasible and efficient method for iron and phosphorus separation of high-phosphorus oolitic hematite. The phosphorus content in iron nuggets is relatively low. Through the optimization of process parameters, the lowest of phosphorus in iron nuggets is 0.22 pct, the dephosphorization rate is above 86 pct, and the recovery of Fe is above 85 pct by the iron nugget process. This study aims to provide a theoretical and technical basis for economical and rational use of high-phosphorus oolitic hematite. 相似文献
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《钢铁冶炼》2013,40(9):689-697
High phosphorus oolitic hematite deposit is a kind of refractory iron ore resource of huge amount. At present, it is difficult to be utilised by traditional physical and chemical technology efficiently and economically. A novel process for utilisation of the high phosphorus oolitic hematite based on carbon composite pre-reduction and fast melting separation has been put forward in the paper. High grade pig iron nugget of low phosphorus could be obtained in the present research. The influence of experimental conditions, such as pre-reduction temperature, C/O (molar ratio) and basicity, on the dephosphorisation behaviours was studied in detail. The thermodynamic basis and reduction and melting separation process were also analysed. The phosphorus content in the iron nugget decreased with the increasing of basicity and increased with the increasing of C/O. The optimum parameters were pre-reduction temperature of 1200°C for 30?min, C/O of 0.95 and basicity of 1.7. After melting separation of molten iron and slag at 1400°C for 10?min, the iron nugget containing 0.02?wt-% [P] would be obtained. The dephosphorisation degree and iron yield in the form of iron nugget were 97.5% and 96.9% respectively. The iron nugget may be directly used as the raw materials of steelmaking from the view point of its high grade. 相似文献
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《钢铁冶炼》2013,40(7):542-547
AbstractThis study aims to provide theoretical and technical basis for economical and rational use of high phosphorus oolitic hematite. Following physical, chemical and microscopic characterisation of high phosphorus oolitic hematite ore the feasibility of separation of phosphorus and metallic iron by reduction roasting and magnetic separation process were investigated. The results indicate that such a process is a feasible and efficient method for iron and phosphorus separation of high phosphorus oolitic hematite. The recovery of metallic iron and dephosphorisation rate is relatively low without additives but is significantly improved by appropriate CaO and Na2CO3 addition. With 8%CaO and 3%Na2CO3 the recovery of metallic iron and dephosphorisation rate reach 95.1 and 94.0% respectively. 相似文献
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摘要:鲕状赤铁矿具有含磷高、易泥化,铁与脉石矿物呈鲕状嵌布结构等特点,常规的重选和浮选等工艺难以取得较好的选矿指标。磁化焙烧-磁选工艺是利用高磷鲕状赤铁矿最有效的手段之一。X射线衍射(XRD)分析结果表明,在750℃的条件下,焙烧矿中磁铁矿的相对质量分数最大。焙烧温度高于800℃会发生过还原现象,生成富氏体,不利于焙烧矿的弱磁选。光学显微镜分析表明磁化焙烧过程不会破坏鲕状赤铁矿的鲕粒结构,只发生铁物相的转变。赤铁矿到磁铁矿的晶型转变由表及里,但是多数鲕状赤铁矿颗粒不会完全磁化,磁化焙烧效果与粒度有关。全铁品位为43.74%的矿样,在焙烧温度750℃、焙烧时间60min的条件下,弱磁选可得到全铁品位为55.42%,铁回收率为85.66%的人工磁铁矿,磁铁矿转化率在90%以上。 相似文献
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鲕状赤铁矿特征及选冶技术进展 总被引:1,自引:0,他引:1
论述了鄂西高磷鲕状赤铁矿的资源状况、矿物组成、矿石结构、矿物工艺学特征,对处理、利用该类矿石存在的问题进行了分析,介绍了常用反浮选、强磁选、磁化焙烧-弱磁选、直接还原焙烧、酸浸及微生物浸出等选冶技术的现状,展望了高磷鲕状赤铁矿还原-磁选、磁选-絮凝脱泥-反浮选等选矿联合流程的发展趋势。 相似文献