放射性铌铁精矿中铀钍脱除及分离

通过对国内某企业进口放射性铌铁精矿进行工艺矿物学分析,确定该精矿的主要矿相为烧绿石,同时伴生钛铁矿和白云母,矿石中放射性元素U和Th的含量分别为0.27%和1.03%。针对该铌铁精矿,探索H2SO4-Fe(Ⅲ)、H2SO4-HF-H2O2、H2SO4-HF、H2SO4-HF-H2O2-(NH4)2CO3体系中U和Th的浸出及分离效果,最终确定H2SO4-HF-H2O2-(NH4)2CO3多段浸出工艺能有效实现U和Th的脱除与分离。U、Th的脱除率分别为100%和80%。基于研究提出了铌铁精矿U、Th脱除及分离工艺流程。     

某铜铅锌硫化矿选矿工艺研究

本文对某铜铅锌硫化矿的矿石性质进行了研究,针对矿石性质的特点及选矿厂存在的问题,提出了铜-铅-锌优先浮选铅粗精矿再磨工艺,通过矿浆pH的调节,高效捕收剂及组合抑制剂的使用、粗精矿的再磨等措施,在原矿Cu、Pb、Zn品位分别为0.27%、2.07%、3.82%的基础上得到了Cu品位22.34%、回收率67.85%的铜精矿,Pb品位72.34%、回收率73.04%的铅精矿和Zn品位50.55%、回收率88.46%的锌精矿,铜铅锌矿物得到较好分离。     

Comprehensive Utilization of Complex Titania Ore

 To fully utilize Panzhihua titanium resources, a new process was proposed. In the process, Panzhihua ilmenite concentrate was first reduced in a rotary hearth furnace (RHF) to produce a titanium rich material and iron. The titanium rich material was then used in a new chlorination process to produce TiCl4. The comparison of different groups of experimental results or calculation results showed that the utilization ratio of material was improved by using the titanium rich material after pretreatment other than low level titanic ilmenite directly and the combined fluidized beds (FTF) were more likely to reduce bed height and reaction time than the single fluidized beds (Single F or Single T) under the condition of the same chlorination conversion ratio. Finally, the influence of reduction temperature and the anti agglomeration capacity of the combined fluidized bed was analyzed.     

EDTA滴定法直接测定锌精矿中锌量

结合本地区锌精矿的特点和生产实际需求,在参考锌精矿测定锌量国标方法的基础上建立了锌精矿中锌量的快速测定方法。试样经盐酸、硝酸、硫酸、高氯酸分解后,氟化氢铵消除硅,铅生成硫酸铅沉淀,过硫酸铵氧化锰成二氧化锰沉淀,饱和氟化氢铵掩蔽三价铁,硫代硫酸钠掩蔽铜,氟化钾掩蔽铝,碘化钾掩蔽镉,以二甲酚橙为指示剂,在PH=5~6的六次甲基四胺缓冲溶液中,用EDTA标准溶液滴定至溶液由红色变为亮黄色为终点,测定结果即为锌量。该方法无需沉淀过滤分离铁,避免了氢氧化物铁沉淀对锌的吸附和包裹,操作过程简单、快速,分析结果准确可靠,更好的满足了生产实际的需求。     

某含铜金矿石选矿试验研究

针对某含铜金矿石,进行了直接全泥氰化、氨浸—氰化、酸浸—氰化、浮选试验研究。其结果表明,采用"先硫后氧"优先浮选—浮选尾矿氰化工艺流程,获得了较好的技术指标,金回收率可达到93.41%,银回收率达到68.81%。同时,对浮选所得的两种精矿进行氰化试验探索,也获得了较好的浸出指标。     

某难处理金精矿焙烧—氰化提金工艺试验研究

针对某难处理金精矿,采用焙烧-氰化提金工艺进行实验研究。试验得到的最佳条件为:金精矿粒度-0.043 mm 52.85%、一段焙烧温度450℃、时间1 h(炉门关闭),二段焙烧温度700℃(炉门稍开),焙烧时间0.5 h;初始氰化钠浓度0.5‰、L/S=4、氰化时间24 h。在此条件下硫、砷的脱除率分别为99.99%、52.56%,金的浸出率为88.92%。     

Isolation of Leptospirillum ferriphilum by single-layered solid medium

According to physiological and biochemical characteristics of Leptospirillum ferriphilum,a strain of object bacteria was isolated successfully.Bacteria were enriched by selective liquid medium and plated on designed single-layered agar solid medium.Colony was cultured and bacteria were collected.The morphologies of the object bacteria were observed using crystal violet staining,scanning electron microscope(SEM)and transmission electron microscope(TEM).The result of 16S rDNA identification shows that this bacterium belongs to Leptospirillum ferriphilum and it is named as Leptospirillum ferriphilum strain D1.These results indicate that this new single-layered agar solid medium is efficient and simple for isolation of Leptospirillum ferriphilum.Additionally,physiological-biochemical characteristics show that the optimum initial pH value and its growth temperature are 1.68 and 40 ℃,respectively.The culture of it is used to leach a complex concentrate chalcopyrite,the leaching efficiencies of copper and iron are 1.93 % and 13.74 %,respectively,and it is more effective than the A.ferrooxidans culture in the leaching of the complex concentrate chalcopyrite.     

复杂金精矿“三连炉”火法捕金生产实践

采用富氧底吹"三连炉"造锍捕金工艺处理高砷锑复杂难处理金精矿,实现多金属高效回收。针对复杂金精矿火法处理工艺中金属收得率和工艺调控需求,结合生产实践总结了多种杂质元素分配行为与规律,优化了配矿中不同杂质元素含量,并对不同复杂金精矿在熔炼过程中的铜锍品位进行有针对性的调控,即高砷物料铜锍品位控制在65%,高铅物料铜锍品位控制在72%。可实现复杂难处理金精矿三连炉熔炼中铅、锌、砷、锑、铋、镍整体脱除率达98%以上,为黄金行业绿色冶炼及可持续发展提供参考。     

云南某铁精矿工艺矿物学研究

通过对某铁精矿的工艺矿物学研究,查明矿石矿物组成、矿物的嵌布特征及铁和磷的赋存状态.此铁精矿中,铁矿物主要为褐铁矿、赤铁矿和磁铁矿,脉石矿物以石英、白云石、白云母、高岭石为主.最后阐述了影响选矿工艺的因素及措施.     

硫化锌精矿常压直接浸出技术现状

在广泛收集整理国内外硫化锌精矿直接浸出技术资料的基础上,对常压直接浸出技术原理、工艺过程及设备进行了介绍和评述,指出常压直接浸出技术是现有锌系统技术改造、实现扩产及锌浸出渣资源循环利用的优选方案之一.