菱锌矿的硫化电位控制浮选机理研究

以十二胺为捕收剂、硫化钠为活化剂,通过菱锌矿单矿物浮选试验系统研究了硫化钠用量、硫化时间、搅拌条件、加药方式以及矿浆pH值对其浮游性和硫化电位的影响。利用相关系数法分析了各因素对硫化电位的影响趋势及相关性。采用多元回归方法建立了浮选回收率与硫化电位的数学模型。利用Matlab软件拟合出硫化电位与主要因子之间的数学模型方程,结合回收率与电位的数学模型,因素与电位的数学模型为实现硫化过程的优化调控提供了理论基础。     

氧化锌矿硫化转化冶选处理工艺研究

以云南某地区的砂岩和灰岩按1.5：1配成的混合矿为研究对象,分别考察无硫化混合矿样和在固定硫化时间180min,矿物粒度-0.074mm占87%以上,液固比1.2：1,硫磺量为原料量的5.5%的条件下,硫化转化温度分别为155℃、165℃、175℃、185℃、195℃、215℃、225℃时的硫化产物的浮选效果。结果表明,硫化产物比无硫化的氧化锌矿的浮选效果好。无硫化的氧化锌矿直接浮选时,铅、锌的回收率分别为33.58%、35.77%,而当硫化转化温度达到225℃,铅、锌的回收率较高,分别达到95.77%、93.52%。     

氧化锌矿浮选研究现状评述

氧化锌矿石浮选的研究对于氧化锌矿资源的开发和利用具有重要意义。目前 ,国内外氧化锌矿的浮选方法分为硫化 -胺浮选法、硫化 -黄药浮选法、脂肪酸直接浮选法、高碳长链SH基捕收剂浮选法及其它浮选法等 ,本文叙述了这些方法的国内外研究现状及它们的优、缺点 ;并指出 ,常规硫化 -浮选方法是氧化锌矿石工业生产上的最常用浮选方法 ,微细粒氧化锌矿的高效回收是合理利用氧化锌矿的技术关键之一。     

菱锌矿加温硫化浮选动力学研究

研究了菱锌矿加温硫化浮选的过程。考察了温度和硫化钠用量对菱锌矿浮选回收率的影响,研究了Na2S在菱锌矿表面上吸附量与温度和搅拌时间的关系,推导了菱锌矿加温硫化浮选过程动力学方程式,分析了其过程和原理。     

氧化锌矿浮选现状及研究进展

本文根据近年来国内外选矿文献,对近年来氧化锌矿的主要浮选方法、新的浮选药剂和氧化锌矿选矿新工艺进行了评述.     

菱锌矿表面硫化研究进展

氧化锌矿和硫化锌矿是锌资源的主要组成部分,随着锌需求的不断增长及硫化锌矿资源的日益消耗,氧化锌矿的高效利用将成为解决锌资源匮乏问题的重要手段,而菱锌矿作为氧化锌矿物的典型代表,被广大科研工作者关注和研究。近年来,硫化浮选法被广泛应用于处理氧化锌矿,故硫化是该工艺的关键环节。在前人研究的基础上,本文详细归纳和分析了菱锌矿的表面硫化机理及影响硫化的主要因素,并详细阐述了强化菱锌矿表面硫化的方法,指出在今后的研究中,应借助多学科交叉及各先进检测分析手段完善菱锌矿的表面硫化机理和强化硫化机制。同时,研发高效硫化-绿色清洁的新型高效浮选技术有助于选矿工作者们更好地从事生产实践。     

高硅型异极矿硫化—胺类捕收剂浮选机理研究

采用浮选溶液化学理论结合第一性原理研究了高硅型异极矿硫化—胺类捕收剂浮选作用机理.研究表明,长链胺分子对异极矿回收率高于短链胺分子,直链胺分子的捕收能力优于同分子量的支链结构;矿浆pH值为11有利于异极矿与石英的分离,十八伯胺的适宜用量为1.25×10-4 mol/L;硫化钠可以显著提高异极矿回收率.溶液化学分析显示H...     

氧化锌矿浮选现状与前景

本文简要评述了近年来国内外在氧化锌矿浮选药剂和浮选工艺方面的现状，认为新型高效浮选药剂和浮选新工艺的研究是氧化锌矿浮选研究的发展方向。     

菱锌矿加温硫化浮选药剂作用机理的研究

采用红外光谱法对菱锌矿与Na2S,CA及氧锌灵浮选药剂的作用机理进行了研究.研究结果表明Na2S活化菱锌矿的机理为S2-与菱锌矿矿粒中的CO2-3发生置换反应,生成了疏水的ZnS薄膜层,促进了捕收剂的吸附;CA通过N-与菱锌矿矿粒表面上的Zn2+螯合而形成疏水的配合物;氧锌灵与菱锌矿表面的Zn2+发生化学吸附生成疏水的脂肪酸锌Zn(OOCR)2.同时进行了加温对比试验,结果表明适当加温对菱锌矿的选别有利.     

菱锌矿加温硫化浮选药剂作用机理的研究

采用红外光谱法对菱锌矿与Na2S,CA及氧锌灵浮选药剂的作用机理进行了研究.研究结果表明:Na2S活化菱锌矿的机理为S2-与菱锌矿矿粒中的CO23-发生置换反应,生成了疏水的ZnS薄膜层,促进了捕收剂的吸附;CA通过N-与菱锌矿矿粒表面上的Zn2+螯合而形成疏水的配合物;氧锌灵与菱锌矿表面的Zn2+发生化学吸附生成疏水的脂肪酸锌Zn(OOCR)2.同时进行了加温对比试验,结果表明:适当加温对菱锌矿的选别有利.     

汤丹某难选氧化铜选矿试验研究

云南汤丹某氧化铜矿品位为0.82%,氧化铜约占80%,其中结合氧化铜占30%,属于低品位氧化铜矿。矿石工艺矿物学的研究表明:有用矿物嵌布粒度细,结构形态复杂,是难选氧化矿。试验探索了最佳的磨矿细度,活化剂和捕收剂的类型及用量。在适宜的磨矿细度和药剂制度下,采用一段磨矿,两次粗选、一次扫选、三次精选流程获得的指标是:铜精矿品位14.31%,回收率70.24%。     

某铅锌矿氧化矿浮选工艺研究与实践

通过开展小型试验,确定氧化铅的最佳浮选的药剂制度,指导实际生产,在工业生产过程中铅精矿品位和回收率都得到了明显的提高,取得了良好试验效果。     

云南某氧化铅锌矿选矿试验研究

云南某氧化铅锌矿嵌布粒度微细、伴生关系复杂、含泥量大且原矿品位低.通过多种方案的比较,采用硫化钠作铅矿物活化剂、丁基黄药作捕收剂优先选铅;选铅尾矿用十八胺作捕收剂的试验方案,获得了含铅50.60%、铅回收率为77.65%的铅精矿,以及含锌40.39%、锌回收率为75.85%的锌精矿.     

难选氧化锑矿浮选工艺研究

对某难选氧化锑矿进行了浮选试验研究。试样为氧化锑矿物占60.31%,硫化锑矿占39.69%的混合锑矿,氧化率较高。通过开展活化剂、抑制剂和捕收剂种类和用量试验,获得了最佳的工艺参数,用混合浮选工艺可实现氧化锑矿和硫化锑矿同时回收。结果表明:以改性水玻璃-302为抑制剂,丁基黄药和EF105为捕收剂,硝酸铅为活化剂,松醇油为起泡剂,在最佳用量条件下,采用一粗两扫二精的浮选流程,可获得锑品位为16.01%、锑回收率为72.86%的锑精矿。     

Dispersion effect on a lead–zinc sulphide ore flotation

This investigation was performed with samples from a lead–zinc sulphide deposit aiming at studying the influence of the dispersion degree of the particles in the pulp on lead and zinc flotation. Samples of ore and also of the minerals sphalerite, galena, pyrite, and dolomite were selected for the experiments. Nine types of dispersing agents and six blends among them were employed.A set of three dispersing agents was selected for the lead flotation and another set of three was chosen for zinc flotation. The criteria for the reagents selection were: high dispersion degree for galena and low for the other species, high dispersion degree for sphalerite and low for the other species, low dispersion degree for pyrite and high for the other species, and high dispersion degree for all species.Lead flotation experiments were performed under three conditions aiming at verifying the influence of the dispersing agent, of the pH, and of sodium carbonate. The zinc flotation tests were carried out at pH 10.5, modulated with lime.The use of dispersing agents in lead flotation did not improve the overall efficiency of the circuit for, despite improving the lead metallurgical recovery, they increase significantly the zinc losses in the lead concentrate.Sodium carbonate presented a low dispersion degree and did not affect the lead flotation results when compared with those achieved at natural pH and at pH 9.8 modulated with lime.Two dispersing agents were particularly effective in zinc flotation: dispersant 3223, a sodium polyacrylate, and sodium hexametaphosphate. Both reagents significantly enhanced zinc recovery without impairing the concentrate quality.     

Mechanism of current transfer in oxidized iron ore minerals

Mining Institute, Krivoi Rog. Translated from Fiziko-Technicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 107-116, March-April, 1992.     

Fahl ore flotation

The authors discuss flotation of fahl ore. It is proved that tennantite should be separated into an individual copper product in order to enhance overall copper recovery and mitigate ecological impact by means of preventing arsenic volatilization under smelting. Single mineral fractions of pyrite, chalcopyrite, tennantite, secondary sulfides, sphalerite and quartz sampled in the Ural region, as well as the samples of copper-zinc ore containing fahl ore are examined. The research involves oxidation of copper sulfides and pyrite under grinding in different conditions. Concentration of oxygen and sulfur-bearing ions is under control. The differences in oxygen consumption, oxidation of pyrite, tennantite and other sulfides are used to develop the mode of tennantite separation from other copper sulfides, sphalerite and pyrite. Based on the research findings, the authors recommend a flotation technology for copper–zinc pyritic ore with high content of tennantite to separate tennantite and secondary copper sulfides in different flotation circuits at varied pH.     

The effect of zinc cyanide on the flotation of gold from pyritic ore

In gold processing plants, the process water contains a considerable amount of weak acid dissociable (WAD) cyanide species. The cyanide-containing water recycled to flotation circuits has a deleterious effect on mineral flotation. Zinc cyanide can be a major constituent of the process water due to the cyanide leaching of zinc minerals and the zinc cementation applied to precipitate gold and silver. In the present study, the effect of zinc cyanide on the flotation of gold from a pyritic ore was evaluated and the competitive adsorption between zinc cyanide species and the collector, potassium amyl xanthate (PAX) or Aerophine promoter (3418A), on gold was studied by surface enhanced Raman spectroscopy (SERS). It was found that free cyanide did not depress the flotation of liberated gold, but zinc cyanide with a CN/Zn ratio of 2 did. The depression of gold flotation by zinc cyanide was due to the preferential adsorption of Zn(CN)₂ on gold surface over either 3418A or amyl xanthate in the solution, rendering gold surface hydrophilic.     

某含铅锌金矿石全泥氰化—尾渣浮选铅锌试验研究

某含铅锌金矿石中金属硫化物之间存在较复杂的矿物共生关系,以减少金的损失为优先条件,通过选矿试验研究,采用原矿全泥氰化;尾渣浮选铅锌工艺流程,金回收率达到95.69%,同时获得合格铅精矿和锌精矿,铅精矿品位66.41%、回收率79.24%,锌精矿品位51.88%、回收率89.49%。     

凝灰岩矿泥影响氧化铜矿浮选过程的机理

凝灰岩型氧化铜矿浮选过程中,矿泥对浮选过程产生严重影响。采用SEM-EDS对矿泥、浮选精矿和尾矿的形貌及矿物组成进行表征,测量矿泥比表面积,药剂吸附量,研究矿泥对捕收剂的吸附特性。结果表明:凝灰岩矿泥表面为鳞片、薄片状,比表面积大,对捕收剂吸附活性高。提高矿浆温度,取消起泡剂,氧化铜矿浮选效果得到改善。一粗两精三扫、中矿顺序返回的闭路流程能够获得品位21.40%、回收率86.25%的铜精矿。