共查询到19条相似文献,搜索用时 140 毫秒
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研究了酸浸处理高磷铁矿脱磷及其影响因素.实验用鄂西鲕状高磷矿Fe的质量分数为51.7%,P的质量分数约0.5%,S的质量分数为0.34%.通过硫酸浸出,浸出矿中磷的质量分数降低至0.07%左右,而铁损只有0.18%,S的质量分数为0.35%,满足钢铁生产的要求.通过扫描电镜观察和能谱分析表征了高磷矿中磷的脱除,在实验酸度下能明显看出磷灰石溶解,而铁相基本不反应,并得到了热力学计算证明.实验确定了最佳的酸浸条件:浸出时间1 h,液固比100mL:8 g,酸度0.2 mol·L-1,振荡频率150 Hz.通过微波加热预处理,高磷铁矿中产生微裂纹,增加了矿石的比表面积,但是这并没有明显促进酸浸脱磷的进行.通过补酸的方式循环利用酸浸液处理高磷铁矿能得到较好的脱磷效果,脱磷率稳定在80%,能有效减少酸耗、保护环境. 相似文献
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红土镍矿湿法处理现状及研究 总被引:1,自引:0,他引:1
文章总结了红土镍矿湿法处理现状,即还原焙烧一氨浸法和加压酸浸法。介绍了几种新的红土镍矿湿法处理工艺,包括常压硫酸浸出法、盐酸浸出法、生物浸出法、碱融脱硅法等。碱融脱硅法有利于资源综合利用,硫酸堆浸技术将会有更大的发展空间。 相似文献
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利用硫酸渣脱硫制备高品质铁精矿具有良好的的工业利用价值,不仅可以解决烧渣的综合利用问题,而且可以解决其对环境影响的问题.本文系统介绍了硫酸渣脱硫制备高品质铁精矿的脱硫技术方法、工艺流程及最新研究进展.硫酸渣脱硫方法主要有化学法、联合法和生物法.化学法主要包括酸浸、碱浸,联合法可分为碱浸-酸浸、浮选-磁选、重选-浮选、磁化焙烧-磁选等联合工艺方法.比较了这些方法的工艺路线及存在的优缺点,提出了生物法具有良好的工业应用前景,展望了该方法未来的研究方向为:高效脱硫菌种的选育,生物脱硫液的循环使用,硫酸渣生物脱硫协同回收有价金属,生物脱硫过程基础理论及工程化技术研究等. 相似文献
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Removal of Phosphorus From High Phosphorus Iron Ores by Selective HCl Leaching Method 总被引:1,自引:0,他引:1
The selective HCl leaching method was used to remove phosphorus from high phosphorus iron ores. The hydroxyapatite in high phosphorus iron ores was converted into soluble phosphate during the process of HCl leaching. The effects of reaction time, particle size, hydrochloric acid concentration, reaction temperature, liquid solid ratio and stirring strength on the dephosphorization ratio were studied. The results showed that the dephosphorization ratio can exceed 98% under the conditions of reaction time 30-45 min, particle size <0147 mm, hydrochloric acid concentration 25 mol/L, reaction temperature 25 ℃, liquid solid ratio 5∶1 and stirring strength 502-1276 s-1. After dephosphorization reaction, the content of phosphorus in iron ore complied completely with the requirements of steel production. 相似文献
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摘要:使用高磷铁矿石冶炼所产生的高磷钢渣被视为一种磷资源。为了回收高磷钢渣中的磷,研究采用了选择性浸出和沉淀的方法,对不同P2O5含量的高磷钢渣进行了研究。结果表明:高磷钢渣中P2O5主要富集在2CaO·SiO2-3CaO·P2O5固溶体中;pH值为5.0时高磷钢渣中大部分固溶体被溶解分离,磷溶出率超过81.0%,而铁溶出率低于6.0%,实现了选择性浸出;浸出后的低磷残渣可作为冶金熔剂循环使用;升高浸出液pH值后,磷酸根离子形成沉淀;回收的沉淀物中P2O5质量分数达到23.9%,可作为磷肥使用。通过本工艺,高磷钢渣中磷能被有效分离及提取,实现了资源化利用。 相似文献
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在HSC6.0计算软件热力学分析的基础上,采用正交实验确定了高磷鲕状赤铁矿酸浸脱磷保铁的最佳工艺,并以最佳工艺为基础进行了酸浸过程中脱磷和铁损反应的动力学研究。热力学分析表明H_2SO_4为最佳酸浸用酸。正交实验得出最佳酸浸条件为:H+浓度为0.5mol/L的H_2SO_4溶液、酸浸时间40min、温度298K、液固比200mL∶14g、搅拌速度100r/min。在该条件下,脱磷率可达98.89%,铁损率仅为0.51%。通过SEM-EDS对酸浸前后高磷鮞状赤铁块矿试样分析表征得出:经H_2SO_4浸出后,磷灰石基本完全溶解,含铁矿相未发生明显反应。动力学分析显示:优化条件下,酸浸脱磷反应在298~328K内符合收缩未反应核模型,浸出过程主要受内扩散控制,表观活化能为11.24kJ/mol;铁损反应在298~328K内遵循收缩未反应核模型,浸出过程主要受化学反应控制,表观活化能为42.24kJ/mol。 相似文献
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《钢铁研究学报(英文版)》2016,(7):661-668
High pressure roll grinding (HPRG)and ball milling were compared to investigate the influence of me-chanical activation on the acid leaching dephosphorization of a high-phosphorus iron ore concentrate,which was man-ufactured through magnetizing roasting-magnetic separation of high-phosphorus oolitic iron ores.The results indica-ted that when high-phosphorus iron ore concentrates containing 54·92 mass% iron and 0·76 mass% phosphorus were directly processed through acid leaching,iron ore concentrates containing 55·74 mass% iron and 0·33 mass%phosphorus with an iron recovery of 84·64% and dephosphorization of 63·79% were obtained.When high-phosphor-us iron ore concentrates activated by ball milling were processed by acid leaching,iron ore concentrates containing 56·03 mass% iron and 0·21 mass% phosphorus with an iron recovery of 85·65% and dephosphorization of 77·49%were obtained.Meanwhile,when high-phosphorus iron ore concentrates activated by HPRG were processed by acid leaching,iron ore concentrates containing 58·02 mass% iron and 0·10 mass% phosphorus were obtained,with the iron recovery reaching 88·42% and the dephosphorization rate reaching 88·99%.Mechanistic studies demonstrated that ball milling can reduce the particle size,demonstrating a prominent reunion phenomenon.In contrast,HPRG pretreatment contributes to the formation of more cracks within the particles and selective dissociation of iron and P bearing minerals,which can provide the favorable kinetic conditions to accelerate the solid-liquid reaction rate.As such,the crystal structure is destroyed and the surface energy of mineral particles is strengthened by mechanical ac-tivation,further strengthening the dephosphorization. 相似文献
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高泥质氧化铜矿酸浸试验研究 总被引:3,自引:1,他引:2
针对某高泥质氧化铜矿堆浸中渗透困难、难以浸出的问题开展试验研究,得到了采用浓酸液强化浸出不仅有利于增加矿石的渗透性,而且还有利于提高矿石的浸出率和浸出液品位、降低浸出酸耗,并最终找到了适合的浸出工艺参数。 相似文献