复杂难选铅锌矿石提高精矿质量和金属回收率清洁选矿新工艺研究

对某矿矿石性质研究的基础上，提出采用SN-9#作铅的捕收剂、(ZnSO4 YLSN)为锌矿物的抑制剂，在高碱条件下抑锌浮铅，然后矿浆选锌的新工艺。试验结果表明，新工艺对该矿某种难选矿石可获得质量更优的铅精矿与锌精矿，且铅锌回收率均有较大幅度的提高。     

难选铜铅锌混合矿石选矿试验研究

针对某细粒嵌布、氧化程度较高的难选铜铅锌混合矿石,采用部分混合优先浮选,即铜铅混浮,再铜、铅分离,铜铅尾矿选锌的浮选工艺流程进行铜、铅、锌选别试验研究。其结果表明:在最佳条件下,闭路试验获得了铜品位38.63%、铜回收率42.53%的铜精矿,铅品位65.37%、铅回收率53.13%的铅精矿,锌品位57.79%、锌回收率30.85%的锌精矿,为多金属混合矿石的回收利用提供借鉴。     

江西某选铅尾矿综合再利用的试验研究

江西某选铅尾矿中含有锌,该锌属于难选锌矿石,嵌布粒度较细,通过系统的选矿试验,结果表明：采用一次粗选两次扫选、粗精矿再磨、再进行三次精选的工艺流程可以获得品位为46.82%,回收率84.76%的合格锌精矿,选别指标很好.     

某难选铅锌矿浮选分离试验研究

针对湖南某难选铅锌矿的矿石性质,采用脱碳-铅优先浮选工艺流程对其进行了分选试验研究,考察了脱碳对铅锌浮选的影响,探索了铅优先浮选时锌的组合抑制剂以及铅捕收剂的最佳药剂制度,并以此为基础进行闭路试验获得铅精矿含铅68.83%,回收率81.17%;锌精矿含锌46.10%,精矿回收率69.02%的选矿指标。     

青海某低品位难选铅锌矿石合理选矿流程的探索

青海某铅锌矿铅锌品位低,铅矿物与锌硫矿物共生关系密切,属于难选低品位铅锌矿石,采用优先浮选工艺方案对该矿石进行了小型试验.试验结果表明,优先浮选工艺方案利用铅矿物与锌硫矿物可浮性差异较大的特点,采用石灰、亚硫酸钠和硫酸锌等抑制锌硫,以乙硫氮为铅捕收剂,进行铅矿物的优先浮选,选铅尾矿脱水后调节矿浆pH值至10.5左右,用硫酸铜作为活化剂来活化铁闪锌矿选锌,试验在原矿含铅2.27%,含锌1.17%的条件下,取得了铅精矿含铅50.87%,铅回收率为78.33%,锌精矿含锌45.30%,锌回收率为70.47%的技术指标.      

广西某难选铅锌多金属硫化矿石选矿试验研究

广西某难选铅锌多金属硫化矿石,由于铅、锌矿物共生关系复杂,嵌布粒度不均匀,致使铅、锌分选困难。通过采用铅-锌依次优先浮选流程,以及合理的药剂制度,铅、锌矿物得到有效分离。闭路试验获得较好选矿技术指标:铅精矿铅品位55.15%,锌品位4.25%,铅回收率76.81%;锌精矿锌品位47.54%,铅品位2.93%,锌回收率77.22%;矿石中伴生的银在铅精矿中得到有效富集,银品位1 764.09 g/t,银回收率61.46%。     

提高某高硫铅锌矿铅锌回收率的试验研究

采用铅硫混选-分离-选锌-硫精矿再选锌的原则工艺流程处理某高硫铅锌矿矿石,可以得到铅精矿、主流程锌精矿1及硫精矿再选锌精矿2及硫精矿等精矿产品,铅精矿中Pb铅回收率91.13%,锌精矿中锌回收率94.49%。银绝大部分在铅锌精矿中得到富集,银在铅锌精矿中的回收达到86.22%。     

难选低品位铜铅锌多金属矿选矿试验研究

新疆某铜铅锌矿属于难选低品位多金属硫化矿,原矿铜品位0.15%、铅品位3.52%、锌品位1.24%。针对该矿石性质,试验采用铜铅混合浮选—铜铅分离—铜铅尾矿选锌—锌尾矿再磁选铁的浮选流程,可获得铜品位22.30%、铜回收率68.63%的铜精矿,铅品位58.67%、铅回收率86.83%的铅精矿,锌品位42.85%、锌回收率65.32%的锌精矿,及品位67.0%的铁精矿,全铁回收率62.97%(对磁性铁的回收率为97.52%),闭路产品全部达到国家质量标准要求。     

吐鲁番地区某难选铅锌矿选矿试验研究

对吐鲁番地区某难选铅锌矿进行了系统的工艺矿物学和选矿试验研究。结果表明该矿石铅锌矿物相互交代、包裹,粒度较细,二者解离困难。试验确定宜采用优先选铅,锌粗精矿再磨的浮选工艺流程。在铅粗选磨矿细度-200目80％和锌粗选磨矿细度-325目90％的条件下,可获得Pb品位为40．22％,含Zn6．94％,回收率82．48％的铅精矿和Zn品位为50．17％,含Pb1．08％,回收率86．92％的锌精矿。     

难选氧化铅锌矿选矿工艺研究

某深度氧化铅锌矿,矿物嵌布粒度细、泥化严重较为难选,特别是锌的回收非常困难,根据矿石的矿物学特征,在不脱泥的条件下,对传统的硫化-黄药法和硫化-胺法进行了优化,在铅氧化率86.71%、锌氧化率为89.19%条件下,获得了铅品位55.27%、回收率91.34%的铅精矿和锌品位41.59%、回收率为69.71%的锌精矿,成功的实现了该矿的高效分选。     

When a physician makes a mistake

Inevitably, doctors make mistakes in the normal course of providing care. Making a mistake often causes distress for the doctor involved, but it can also be an important source of knowledge and self-reflection. This article discusses central aspects with respect to mistakes and medical malpractice. The doctor's relationship to ethics and legislation is discussed, and an overview of the administrative action taken by the Norwegian health authorities is presented. The organisations and offices a physician may come into contact with when involved in a patient's complaint are briefly presented. "Meldesentralen" was formed in 1993 by the Norwegian Directorate of Health for the purpose of collecting reports on accidents in medical practice. We argue that the accidents reported to "Meldesentralen" do not reflect the true situation on this issue. We introduce a model for a systematic approach towards a colleague who has made a mistake or who is suspected of having made one.     

Valuing a practice for a partnership

The hot topic from Capitol Hill in Washington to Capitol Hill in Jefferson City is health care reform. President Clinton started the ball rolling during the campaign in 1992 by including health care reform in his platform. He continued the effort after his election by appointing his wife, Hillary, to chair a task force to present an outline for federal legislation. Since the package was presented to Congress, there has been much discussion, lobbying, and rumoring about the implications of health care reform and what it could mean to all of us as dentists. On the home front, Governor Carnahan has introduced legislation in Missouri to reform the health care system. This effort is known as the Missouri Health Assurance Plan (H.B. 1622). Missouri Dental Association members are vitally concerned about the impact of health care reform on their practice, their taxes, their relationship with their patients and employees, and on their ability to seek out health care services since each member is also a consumer of health care. This article represents answers to some of the questions being asked by MDA members in order that they might be more aware of the activities by the MDA, the ADA, and other levels of organized dentistry relating to health care reform.     

Aspiration of a primary tooth in a patient with a tracheostomy

We report a clinical case of a patient affected by splenic non-Hodgkin lymphoma and virus C hepatitis. It seems that this kind of association is original because as far as we know the association between non-Hodgkin lymphoma and HCV did not include non-Hodgkin lymphoma involving the spleen. Indeed, in our patient, there was an increase of CD/57 lymphocytes. In our opinion this could be interesting in the disorders of the immune system associated with lymphoma.