The relationship between viscosity/yield stress and flotation rate in different chalcopyrite and lizardite concentrations was investigated by zeta potential measurements,rheological tests,flotation experiments,and Der...The relationship between viscosity/yield stress and flotation rate in different chalcopyrite and lizardite concentrations was investigated by zeta potential measurements,rheological tests,flotation experiments,and DerjguinLandau-Verwey-Overbeek theoretical calculation.Results indicated that the concentration of minerals would affect the viscosity and yield stress of the slurry.That is,the viscosity/yield stress in the slurry rises accordingly when the concentration of minerals increases.The increase in viscosity/yield stress in slurry is also unfavorable to the enrichment of chalcopyrite but is conducive to the entrainment of lizardite in either single or binary system.Specifically,the flotation rate of chalcopyrite decreases while that of lizardite increases with the rise in viscosity/yield stress.展开更多
The density of fine coal has a major effect on the value of its flotation rate constant. The collector dose can increase the flotation rate of fine coal, especially for low ash coal, but the effect for gangue is not n...The density of fine coal has a major effect on the value of its flotation rate constant. The collector dose can increase the flotation rate of fine coal, especially for low ash coal, but the effect for gangue is not notable. The flotation rate of gangue is mainly governed by the water entrainment. A coal flotation rate constant model has been developed.展开更多
Effect of entrapment of water flow on fine coal flotation was studied. The relation between constant of water flotation rate and flotation time was investigated and the water recycling model determined. The entrapment...Effect of entrapment of water flow on fine coal flotation was studied. The relation between constant of water flotation rate and flotation time was investigated and the water recycling model determined. The entrapment model of water flow about the relation between the recovery of fine particle and that of water in concentration was established. Finally, the equation about ash in fine clean coal at any time was derived by introducing a de-ashing coefficient.展开更多
With the rise of artificial intelligence(AI)in mineral processing,predicting the flotation indexes has attracted significant research attention.Nevertheless,current prediction models suffer from low accuracy and high ...With the rise of artificial intelligence(AI)in mineral processing,predicting the flotation indexes has attracted significant research attention.Nevertheless,current prediction models suffer from low accuracy and high prediction errors.Therefore,this paper utilizes a two-step procedure.First,the outliers are pro-cessed using the box chart method and filtering algorithm.Then,the decision tree(DT),support vector regression(SVR),random forest(RF),and the bagging,boosting,and stacking integration algorithms are employed to construct a flotation recovery prediction model.Extensive experiments compared the prediction accuracy of six modeling methods on flotation recovery and delved into the impact of diverse base model combinations on the stacking model’s prediction accuracy.In addition,field data have veri-fied the model’s effectiveness.This study demonstrates that the stacking ensemble approaches,which uses ten variables to predict flotation recovery,yields a more favorable prediction effect than the bagging ensemble approach and single models,achieving MAE,RMSE,R2,and MRE scores of 0.929,1.370,0.843,and 1.229%,respectively.The hit rates,within an error range of±2%and±4%,are 82.4%and 94.6%.Consequently,the prediction effect is relatively precise and offers significant value in the context of actual production.展开更多
To modify surface roughness and improve flotation performance,hydrochloric acid etching pretreatment was performed on magnesite and dolomite.Flotation tests disclosed that acid corrosion improved the flotation kinetic...To modify surface roughness and improve flotation performance,hydrochloric acid etching pretreatment was performed on magnesite and dolomite.Flotation tests disclosed that acid corrosion improved the flotation kinetics and flotation recovery rates of magnesite and dolomite.Under pulp pH 10 and sodium oleate(NaOl)concentration 20 mg·L^(-1),the flotation recovery rates of magnesite and dolomite after acid etching increased by 31.05%and 29.20%,respectively,compared with those before acid etching.Adsorption density tests proved that the adsorption density of NaOl on magnesite and dolomite was higher after acid etching than before acid etching,implying that acid etching drives Naol adsorption.Zeta potential analysis revealed that acid etching reduces the point of zero charge of magnesite and dolomite.Atomic force microscopy and X-ray photoelectron spectroscopy results demonstrated that acid corrosion modified the surface roughness of magnesite and dolomite,increasing the magnesium(Mg)content on the magnesite surface and the calcium and Mg contents on the dolomite surface.Contact angle measurements indicated that acid corrosion slightly reduced the contact angle between magnesite and dolomite.With Naol present on the surface,the contact angles of magnesite and dolomite after acid etching significantly increased compared with those before acid etching.Therefore,acid etching is effective in improving the floatability of magnesite and dolomite.展开更多
基金Project(2018TP1002)supported by the Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,ChinaProject(2019zzts994)supported by the Central South University Graduate Research and Innovation Project,China。
文摘The relationship between viscosity/yield stress and flotation rate in different chalcopyrite and lizardite concentrations was investigated by zeta potential measurements,rheological tests,flotation experiments,and DerjguinLandau-Verwey-Overbeek theoretical calculation.Results indicated that the concentration of minerals would affect the viscosity and yield stress of the slurry.That is,the viscosity/yield stress in the slurry rises accordingly when the concentration of minerals increases.The increase in viscosity/yield stress in slurry is also unfavorable to the enrichment of chalcopyrite but is conducive to the entrainment of lizardite in either single or binary system.Specifically,the flotation rate of chalcopyrite decreases while that of lizardite increases with the rise in viscosity/yield stress.
文摘The density of fine coal has a major effect on the value of its flotation rate constant. The collector dose can increase the flotation rate of fine coal, especially for low ash coal, but the effect for gangue is not notable. The flotation rate of gangue is mainly governed by the water entrainment. A coal flotation rate constant model has been developed.
文摘Effect of entrapment of water flow on fine coal flotation was studied. The relation between constant of water flotation rate and flotation time was investigated and the water recycling model determined. The entrapment model of water flow about the relation between the recovery of fine particle and that of water in concentration was established. Finally, the equation about ash in fine clean coal at any time was derived by introducing a de-ashing coefficient.
基金supported by the National Key R&D Program of China(No.2023YFC2908200)National Natural Science Foundation of China(No.52174249)Key Research and Development Program of Jiangxi Province(No.20203BBGL73231).
文摘With the rise of artificial intelligence(AI)in mineral processing,predicting the flotation indexes has attracted significant research attention.Nevertheless,current prediction models suffer from low accuracy and high prediction errors.Therefore,this paper utilizes a two-step procedure.First,the outliers are pro-cessed using the box chart method and filtering algorithm.Then,the decision tree(DT),support vector regression(SVR),random forest(RF),and the bagging,boosting,and stacking integration algorithms are employed to construct a flotation recovery prediction model.Extensive experiments compared the prediction accuracy of six modeling methods on flotation recovery and delved into the impact of diverse base model combinations on the stacking model’s prediction accuracy.In addition,field data have veri-fied the model’s effectiveness.This study demonstrates that the stacking ensemble approaches,which uses ten variables to predict flotation recovery,yields a more favorable prediction effect than the bagging ensemble approach and single models,achieving MAE,RMSE,R2,and MRE scores of 0.929,1.370,0.843,and 1.229%,respectively.The hit rates,within an error range of±2%and±4%,are 82.4%and 94.6%.Consequently,the prediction effect is relatively precise and offers significant value in the context of actual production.
基金supported by the Open Foundation of State Key Laboratory of Mineral Processing (No.BGRIMM-KJSKL-2024-07)the Open Project of the Key Laboratory of Solid Waste Treatment and Resource Utilization of the Ministry of Education,China (No.23kfgko2)the National Natural Science Foundation of China (Nos.51974064,52174239,and 52374259).
文摘To modify surface roughness and improve flotation performance,hydrochloric acid etching pretreatment was performed on magnesite and dolomite.Flotation tests disclosed that acid corrosion improved the flotation kinetics and flotation recovery rates of magnesite and dolomite.Under pulp pH 10 and sodium oleate(NaOl)concentration 20 mg·L^(-1),the flotation recovery rates of magnesite and dolomite after acid etching increased by 31.05%and 29.20%,respectively,compared with those before acid etching.Adsorption density tests proved that the adsorption density of NaOl on magnesite and dolomite was higher after acid etching than before acid etching,implying that acid etching drives Naol adsorption.Zeta potential analysis revealed that acid etching reduces the point of zero charge of magnesite and dolomite.Atomic force microscopy and X-ray photoelectron spectroscopy results demonstrated that acid corrosion modified the surface roughness of magnesite and dolomite,increasing the magnesium(Mg)content on the magnesite surface and the calcium and Mg contents on the dolomite surface.Contact angle measurements indicated that acid corrosion slightly reduced the contact angle between magnesite and dolomite.With Naol present on the surface,the contact angles of magnesite and dolomite after acid etching significantly increased compared with those before acid etching.Therefore,acid etching is effective in improving the floatability of magnesite and dolomite.
