For realizing the effective flotation of refractory copper ox-idized ores and developing the activation-flotation theory , the influences of nine different organic chelating agents on xanthate collection pcnver and it...For realizing the effective flotation of refractory copper ox-idized ores and developing the activation-flotation theory , the influences of nine different organic chelating agents on xanthate collection pcnver and its adsorption characteristics ivere studied in the flotation of malachite and chrysocolla representatively selected by means of XPS,IR, absorbed quanti-ty measurements and flotation tests.For easily-dissolved malachite flotation , a small amount of chelating agent can obviously enhance xanthate collecting power and make malachite floated easily , and so reduces the consumption of xanthate. For hard-dis-晄olved chrysocolla, chelating agent is able to increase its recovery to 90% , but the chelating agent consumption is high. Chelating agent and xanthate can produce synergistic adsorptions, which follmv Freundlich's adsorption equation on malachite and Chrysocolla surfaces. The high chemical activity of chelating agent and its synergistic activation on xanthate are the key to improving xanthate collection poiver. The synergistic activation of chelat-ing agent on xanthate on melachite surfaces is clearly stronger than on chrysocolla surfaces. According to experimental results, it can be thought that the synergistic activation results from the synergistic complexation of chelating agent and xanthate with copper ions to form biligand-tribasic co-ordination complex.展开更多
针对以硅孔雀石为主的高结合率、高钙镁难处理铜矿的进行了酸浸动力学研究,考察了温度、硫酸浓度、搅拌强度和矿石粒径对铜浸出率的影响。结果表明:铜浸出率随温度和硫酸浓度的增大而提升,搅拌强度对铜浸出率影响较小,铜浸出率随矿石粒...针对以硅孔雀石为主的高结合率、高钙镁难处理铜矿的进行了酸浸动力学研究,考察了温度、硫酸浓度、搅拌强度和矿石粒径对铜浸出率的影响。结果表明:铜浸出率随温度和硫酸浓度的增大而提升,搅拌强度对铜浸出率影响较小,铜浸出率随矿石粒径的减小先增大后减小,这可能是由于原矿钙镁含量高,当磨矿细度过细钙镁充分解离,一旦矿石和硫酸接触,钙镁和硫酸迅速反应消耗大量的酸,导致铜的浸出率降低。采用SEM-EDS和XRD对浸出前后矿样进行表征,结果表明碳酸钙与硫酸反应生成硫酸钙沉积在颗粒表面形成固态产物层,阻碍浸出反应。动力学分析表明该浸出过程受固态产物层扩散控制,反应表观活化能为11.43 k J/mol。展开更多
文摘For realizing the effective flotation of refractory copper ox-idized ores and developing the activation-flotation theory , the influences of nine different organic chelating agents on xanthate collection pcnver and its adsorption characteristics ivere studied in the flotation of malachite and chrysocolla representatively selected by means of XPS,IR, absorbed quanti-ty measurements and flotation tests.For easily-dissolved malachite flotation , a small amount of chelating agent can obviously enhance xanthate collecting power and make malachite floated easily , and so reduces the consumption of xanthate. For hard-dis-晄olved chrysocolla, chelating agent is able to increase its recovery to 90% , but the chelating agent consumption is high. Chelating agent and xanthate can produce synergistic adsorptions, which follmv Freundlich's adsorption equation on malachite and Chrysocolla surfaces. The high chemical activity of chelating agent and its synergistic activation on xanthate are the key to improving xanthate collection poiver. The synergistic activation of chelat-ing agent on xanthate on melachite surfaces is clearly stronger than on chrysocolla surfaces. According to experimental results, it can be thought that the synergistic activation results from the synergistic complexation of chelating agent and xanthate with copper ions to form biligand-tribasic co-ordination complex.
文摘针对以硅孔雀石为主的高结合率、高钙镁难处理铜矿的进行了酸浸动力学研究,考察了温度、硫酸浓度、搅拌强度和矿石粒径对铜浸出率的影响。结果表明:铜浸出率随温度和硫酸浓度的增大而提升,搅拌强度对铜浸出率影响较小,铜浸出率随矿石粒径的减小先增大后减小,这可能是由于原矿钙镁含量高,当磨矿细度过细钙镁充分解离,一旦矿石和硫酸接触,钙镁和硫酸迅速反应消耗大量的酸,导致铜的浸出率降低。采用SEM-EDS和XRD对浸出前后矿样进行表征,结果表明碳酸钙与硫酸反应生成硫酸钙沉积在颗粒表面形成固态产物层,阻碍浸出反应。动力学分析表明该浸出过程受固态产物层扩散控制,反应表观活化能为11.43 k J/mol。
