1-羟基2-萘甲羟肟酸的合成及对稀土矿物的捕收性能

在同分异构原理指导下合成新型捕收剂1－羟基2－萘甲羟肟酸，并应用于稀土矿物的选别。用于浮选包钢选矿厂稀土浮选给矿（含REO10．95％）的试验结果表明，1－羟基2－萘甲羟肟酸能有效地捕收稀土矿物，粗选粗精矿品位为37．02％REO，稀土回收率为80．10％。1－羟基2－萘甲羟肟酸是一种很有前途的稀土捕收剂。     

新型羟肟酸捕收剂的合成及其对孔雀石的捕收机理研究

研究了一种新型螯合捕收剂邻苯二羟肟酸在孔雀石[Cu2 CO3(OH)2]与石英(SiO2)浮选分离中的应用.通过微浮选试验,评价了邻苯二羟肟酸对孔雀石和石英的浮选性能.结果表明,邻苯二羟肟酸对孔雀石有较强的吸附和选择性,能有效分离孔雀石和石英.以邻苯二羟肟酸为捕收剂,在pH为9、药剂用量80 mg/L的条件下对人工混合...     

3种捕收剂对氟碳铈矿的浮选性能研究

研究了不同条件下油酸钠、水杨羟肟酸和牦牛坪稀土捕收剂（主要成分为羟基萘羟肟酸）浮选氟碳铈矿的规律,并对其浮选机理进行了探讨。试验结果表明：捕收剂、硅酸钠的用量对氟碳铈矿的浮选影响显著;油酸钠和牦牛坪稀土捕收剂较水杨羟肟酸有更好的浮选效果;在氟碳铈矿的零电点pH=8.5附近,3种捕收剂对氟碳铈矿的浮选效果最佳;羟肟酸类捕收剂在氟碳铈矿表面发生络合反应,而油酸钠可能以静电吸附和分子吸附为主;药剂在矿物表面的竞争吸附或形成配合物均破坏了缔合羟基;水杨羟肟酸和牦牛坪稀土捕收剂在红外光谱图的2356 cm-1附近有新的峰形成,可能是螯合反应形成的五元螯合环。     

羟肟酸类选矿捕收剂的生物降解性评价

利用摇床法对苯甲羟肟酸、水杨羟肟酸、N-羟基邻苯二甲酰亚胺和H205四种羟肟酸类选矿捕收剂的生物降解性进行评价,实验结果表明,四种羟肟酸20d的生物降解率分别为64.85%、60.75%、63.18%、9.41%。依据评价标准,前三种羟肟酸属于易降解选矿药剂,而H205属于难降解有机物。     

羟基萘羟肟酸在氟碳铈矿表面吸附行为的研究

通过研究羟基萘羟肟酸在氟碳铈矿表面吸附时溶液ｐＨ值、溶液药剂浓度以及平衡时间对吸附的影响，讨论羟基萘羟肟酸在氟碳铈矿表面的吸附规律。结果表明，吸附以化学吸附为主，同时兼有物理吸附     

利用浮选药剂的同分异构原理发展新型锡石捕收剂

1—羟基—2—萘甲羟肟酸和2—羟基—3—萘甲羟肟酸是同分异构体。用2—羟基—3—萘甲羟肟酸为捕收剂，TBP为辅助捕收剂，浮选粒度—44μm占100％，-11μm占11．3％的锡石细泥，从含锡1．36％的给矿得到含锡37，39％，回收率91．21％的锡精矿；用它的同分异构体1—羟—2—萘甲羟肟酸浮选粒度-22μm占100％，-11μm占76．8％的锡石细泥，从含锡1．01％的给矿得到含锡18．85％，回收率92．68％的锡精矿。它们都是锡石的有效捕收剂，再次证明浮选药剂的同分异构原理是正确的。     

利用浮选药剂的同分异构原理发展新型锡石捕收剂

1-羟基-2-萘甲羟肟酸和2-羟基-3-萘甲羟肟酸是同分异构体。用2-羟基-3-萘甲羟肟酸为捕收剂,TBP为辅助捕收剂,浮选粒度-44μm占100%,-11μm占11 3%的锡石细泥,从含锡1 36%的给矿得到含锡37 39%,回收率91 21%的锡精矿;用它的同分异构体1-羟-2-萘甲羟肟酸浮选粒度-22μm占100%,-11μm占76 8%的锡石细泥,从含锡1 01%的给矿得到含锡18 85%,回收率92 68%的锡精矿。它们都是锡石的有效捕收剂,再次证明浮选药剂的同分异构原理是正确的。     

利用同分异构原理合成新的锡石捕收剂

2-羟基-3-萘甲羟肟酸(代号F203)是锡石细泥的良好捕收剂,1-羟基-2-萘甲羟肟酸(代号ZJ-3)与F203是同系列同分异构体,它们有相同的官能团,只是羟基和甲肟基位置不同.根据浮选药剂的同分异构体原理,ZJ-3对锡石细泥也应有良好的捕收性能.用ZJ-3作捕收剂浮选大厂车河选厂-19 μm占90.0%、含Sn 1.16%的锡石细泥,经过一次粗选两次精选一次扫选获得含Sn 18.29%、回收率92.68%的锡精矿,效果较好,证明浮选药剂的同分异构体原理足正确的.     

螯合捕收剂配位原子、基团电负性和基团宽度的推算

本文用量子化学的 CNDO/2法(简称全略微分重迭法)计算了螯合捕收剂 N-羟基邻苯二甲酰亚胺的全π电子密度、形式电荷及原子净电荷。结果表明该分子中的三个氧原子的负电荷最大,从而推断该捕收剂与矿石表面的金属离子螯合时的配位原子是三个氧原子,而不是氮原子。本文估算了该捕收剂活性基团的电负性和宽度,结果表明两者数值均较大,故 N-羟基邻苯二甲酰亚胺是过渡金属氧化矿捕收剂。     

一种氟碳铈矿捕收剂的设计筛选及浮选性能研究

以氟碳铈矿为研究对象,研究了以羟肟酸、苯乙烯膦酸、邻苯二甲酸用作捕收剂时的浮选效果。研究结果表明：借助于CAMD技术研发的捕收剂羟肟酸类捕收剂BK415可以有效浮选氟碳铈矿,浮选效果优于H205、苯甲羟肟酸、水杨羟肟酸、邻苯二甲酸等,是一个很有前途的稀土捕收剂。     

Application of reactive oily bubbles to bastnaesite flotation

Reactive oily bubble, defined as air bubbles covered with a thin layer of kerosene containing collectors, was used to float a major rare earth mineral, bastnaesite from rare earth ores. Both fatty acid and hydroxamic acid were used to generate reactive oily bubbles. The flotation of bastnaesite with reactive oily bubble was investigated by zeta potential, zeta potential distribution and induction time measurement and micro-flotation tests. The results showed a quicker attachment to bastnaesite and a stronger collecting power of reactive oily bubbles containing 100 ppm fatty acid than conventional air bubbles, resulting in an enhanced bastnaesite recovery. The flotation recovery of bastnaesite by reactive oily bubbles containing hydroxamic acid is lower than that by conventional air bubble flotation where the bastnaesite was pre-conditioned by hydroxamic acid in aqueous phase. During induction time measurement, no attachment is observed between bastnaesite particles and reactive oily bubbles containing hydroxamic acid, illustrating the importance of collector type in reactive oily bubble flotation technology. These findings suggest the superior performance of reactive oily bubble technique than conventional bastnaesite flotation method only when proper collector is used to generate the reactive oily bubbles.     

Flotation chemistry features in bastnaesite flotation with potassium lauryl phosphate

Bastnaesite is a major mineral resource of importance in the production of rare earth materials. Present flotation practice uses a reagent schedule which typically includes fatty acid or hydroxamic acid as collector. In this research it was found that potassium lauryl phosphate is an appropriate collector for bastnaesite flotation. Results from contact angle and micro-flotation experiments for bastnaesite are reported using potassium lauryl phosphate as collector. Better bastnaesite flotation is achieved at a low level of lauryl phosphate addition when compared to the use of octyl hydroxamate as collector. Initial evaluation suggests that potassium lauryl phosphate should be a promising collector for bastnaesite flotation.     

A new collector for rare earth mineral flotation

A new collector for bastnaesite flotation - modified hydroxamic acid (MOHA) has been developed through several years laboratory research. The experimental results of flotation of pure bastnaesite mineral and rare earth ores, and the application experience in flotation plants showed that MOHA is an efficient collector for bastnaesite flotation. MOHA has stronger collector ability and higher selectivity compared to the other commonly used collectors. Through the measurements of zeta-potential, adsorption and infrared adsorption spectrum and in terms of the electronegativity theory of reagent groups, the flotation mechanism has been discussed. It was concluded that the adsorption of MOHA on bastnaesite surfaces is chemical adsorption in nature through three oxygen atoms in the polar group of MOHA chelating the surface Ce(III) of bastnaesite to form a pentagon-cycle chelate: O---C=N---O---Ce(III)---). Additionally, the chemisorption is accompanied with the multilayer and non-homogeneous physical adsorption of the MOHA molecules. The MOHA adsorption equation at the surfaces of bastnaesite can be expressed as: Γ = 6.76×10⁻²C^1/1.02, while the adsorption rate constant k is: k = 2.64×10⁵min⁻¹mol⁻¹m².     

钽铌矿捕收剂的研究

采用苯甲羟肟酸、C_(7～9)羟肟酸和油酸分别对钽铌矿、石英、长石三种纯矿物进行可浮性研究。结果表明:苯甲羟肟酸对钽铌矿有较强的选择捕收能力,在pH6.0～10.0范围内捕收效果最好,苯甲羟肟酸与辅助捕收剂WT_2以质量比3:1组合使用时,提高了分选指标,起到了“1+1>2”的协同效果。     

铌矿浮选药剂研究进展

评述了铌矿浮选药剂的研究进展及工业应用。分别阐述了胺类阳离子型捕收剂和羟肟酸、膦酸、胂酸、脂肪酸等阴离子型捕收剂与铌矿物的作用机理和应用现状, 从浮选性能、匹配的浮选流程、经济效益以及环境保护的角度评价了各类捕收剂的优缺点: 虽然胺类捕收剂工业应用广泛, 但存在浮选流程长、铌损失大、耗酸多的缺点; 羟肟酸类捕收剂选择性好, 但捕收能力较弱, 药剂用量大、成本高; 膦酸和胂酸类捕收剂捕收能力和选择性都较好, 但对环境危害大。概述了铌矿浮选调整剂的研究进展, 指出了脉石矿物有效抑制剂是铌矿浮选调整剂研究的重点。最后指出铌矿浮选药剂的发展方向是高选择性、低毒、低成本、绿色制备。     

铝盐在氟碳铈矿与独居石浮选分离中的作用机理

在氟碳铈矿与独居石浮选分离中铝盐作调整剂能强烈抑制独居石而使氟碳铈矿与独居石得到有效分离。在白云鄂博混合稀土精矿浮选分离试验中取得良好结果。根据化学的受电子和施电子原理以及在铝盐作用前后氟碳铈矿和独居石表面电性变化，讨论了铝盐在氟碳铈矿与独居石浮选分离中的作用机理。     

DZX-9捕收剂浮选冕宁低品位氟碳铈矿试验研究

摘要:氟碳铈矿型稀土矿浮选,一般需脱泥预处理后用芳香烃羟肟酸或改性羟肟酸等捕收剂在一定条件下浮选可获得合格的氟碳铈精矿[1-3]。四川冕宁三岔河低品位氟碳铈矿型稀土矿含泥高,REO品位仅为1.65%,氟碳铈矿呈不等粒嵌布,矿物组成相对复杂。以弱磁选-重选后所得到的粗精矿（简称重精矿,REO品位为3.73%）为研究对象。研究结果表明,采用常规浮选捕收剂难以获得满意效果,采用自研DZX-9为捕收剂,在pH=8~9,碳酸钠、水玻璃为调整剂,经一次粗选、一次扫选和二次精选,实验室小型浮选闭路试验可获得精矿产率为5.70%,REO品位为60.31%,REO回收率为92.16%较好的技术指标。      

一种新型金红石选择性捕收剂的应用研究

以水杨羟肟酸(SHA)和TPRO作捕收剂, 进行了金红石、石英的单矿物浮选和混合矿浮选试验。试验表明, 与SHA相比, TPRO具有更强的捕收性能和极高的选择性, 且无需活化。在最佳的浮选条件下, 金红石单矿物的浮选回收率可以达到97.5%; 混合矿浮选精矿中金红石的品位大于80%, 回收率大于97%。紫外和红外检测结果表明, TPRO可以与金红石矿物表面发生化学吸附和螯合作用, 从而使其具有较强的捕收性能。推测了TPRO在金红石矿物表面作用产物的结构。这是TPRO首次被用作钛矿物的捕收剂, 对TPRO在金红石实际矿石浮选中的应用具有理论指导和现实意义。