Search Results - "Valdivieso López, Alejandro"

Lime mortars – The role of carboxymethyl cellulose on the crystallization of calcium carbonate by Liu, Hui, Zhao, Yunliang, Peng, Changsheng, Song, Shaoxian, López–Valdivieso, Alejandro

“…[Display omitted] •CMC additive can improve the compressive strength of lime mortar.•The morphology and size of CaCO3 crystals in lime mortar can be controlled…”
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Physical-chemical study of IPETC and PAX collector's adsorption on covellite surface by Botero, Yesica L., Canales-Mahuzier, Andrés, Serna-Guerrero, Rodrigo, López-Valdivieso, Alejandro, Benzaazoua, Mostafa, Cisternas, Luis A.

“…[Display omitted] •Collectors IPETC and PAX have a marked effect on the covellite flotation.•XPS shows that the covellite surface has two oxidation states,…”
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A new insight into the restriction of Cr(VI) removal performance of activated carbon under neutral pH condition by Fang, Yi, Yang, Ke, Zhang, Yipeng, Peng, Changsheng, Robledo-Cabrera, Aurora, López-Valdivieso, Alejandro

“…Activated carbon has been widely used to remove hazardous Cr(VI); however, the impact of Cr2O3 precipitate on gradually declining removal ability as pH…”
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Improvement of compressive strength of lime mortar with carboxymethyl cellulose by Liu, Hui, Zhao, Yunliang, Peng, Changsheng, Song, Shaoxian, López–Valdivieso, Alejandro

“…Air lime mortar is an important material for restoring ancient buildings, but its application is limited because of its low compressive strength, high…”
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Floc-Flotation of Malachite Fines with an Octyl Hydroxamate and Kerosene Mixture by Zhili Li, Feng Rao, Xiaoming Lou, Shaoxian Song, Alejandro López-Valdivieso

“…Malachite fines are easily produced in the grinding process, leading to low malachite flotation recovery. Floc-flotation of malachite fines with an octyl…”
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Depression of Pyrite in Seawater Flotation by Guar Gum by Castellón, César I., Piceros, Eder C., Toro, Norman, Robles, Pedro, López-Valdivieso, Alejandro, Jeldres, Ricardo I.

“…The application of guar gum for pyrite depression in seawater flotation was assessed through microflotation tests, Focused Beam Reflectance Measurements…”
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Cr(VI) adsorption on activated carbon: Mechanisms, modeling and limitations in water treatment by Wang, Yongmei, Peng, Changsheng, Padilla-Ortega, Erika, Robledo-Cabrera, Aurora, López-Valdivieso, Alejandro

“…[Display omitted] •Cr(VI) adsorption mechanisms on activated carbon (AC) were studied and modeled.•Adsorption occurred in two stages, successfully described by…”
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Effects of common ions on adsorption and flotation of malachite with salicylaldoxime by Li, Zhili, Rao, Feng, Song, Shaoxian, Uribe-Salas, Alejandro, López-Valdivieso, Alejandro

“…[Display omitted] Effects of common ions, namely hydroxyl ions and carbonate, on the adsorption and flotation of malachite with salicylaldoxime as a collector…”
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Highly surface activated carbon to remove Cr(VI) from aqueous solution with adsorbent recycling by Fang, Yi, Yang, Ke, Zhang, Yipeng, Peng, Changsheng, Robledo-Cabrera, Aurora, López-Valdivieso, Alejandro

“…To enhance the inferior removal capability of aqueous Cr(VI) by commercial activated carbon under neutral conditions. The emerging ball milling technology was…”
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Selective depression of phenoxyacetyl chloride on magnesite: Implications for effective flotation separation of magnesite from dolomite by Cheng, Guibin, Ma, Yingqiang, López-Valdivieso, Alejandro, Yin, Wanzhong

“…[Display omitted] •POC exhibits excellent depressing performance for magnesite rather than dolomite.•Dolomite can be effectively removed from magnesite by…”
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Role of oxygen and ammonium ions in silver leaching with thiosulfate–ammonia–cupric ions by Ibarra-galvan, Valentin, López-valdivieso, Alejandro, Tong, Xiong, Cui, Yi-qi

“…The dissolution of silver with thiosulfate and copper ions was studied in a batch-stirred reactor at 25 °C in the absence and presence of various ammonium ions…”
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Effects of calcium ions on malachite flotation with octyl hydroxamate by Li, Zhili, Rao, Feng, Guo, Bao, Zuo, Weiran, Song, Shaoxian, López-Valdivieso, Alejandro

“…•Calcium ions improve malachite flotation at pH 6–11.•Calcium ions enhance fine malachite particles aggregation.•Ca(OH)+ and Ca(OH)2 species inhibit malachite…”
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Ball Milling-Enabled mechanochemical reduction of Cr(VI) using sponge iron over an extensive pH range by Fang, Yi, Robledo-Cabrera, Aurora, Peng, Changsheng, Huang, Shan, Xiao, Qi, López-Valdivieso, Alejandro

“…[Display omitted] •Sponge iron powder get oxidizes and inactivated in air.•Ball milling removes Cr(VI) successfully with sponge iron.•Rotational speed and…”
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Effect of mineralogical characteristics evolution of vermiculite upon thermal and chemical expansions on its adsorption behavior for aqueous Pb(II) removal by Hou, Lei, Xing, Baolin, Guo, Hui, Zeng, Huihui, Cheng, Song, Meng, Mingliang, Qu, Xiaoxiao, Valdivieso López, Alejandro, Zhang, Chuanxiang, Cao, Yijun

“…Vermiculite undergoes significant changes in mineralogical characteristics upon chemical (with H2O2) and thermal (roasting) expansions, resulting in a marked…”
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Iron-Based Materials Synthesized by Mechanical Ball Milling for Environmental Contaminants Removal: Progress and Prospects by Fang, Yi, Ni, Xinjie, Xiao, Qi, Huang, Shan, López-Valdivieso, Alejandro

“…This review comprehensively examines recent advancements in the synthesis and environmental applications of iron-based materials (IBMs), with a particular…”
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New insights related to the flotation of covellite in porphyry ores by Botero, Yesica L., Serna-Guerrero, Rodrigo, López-Valdivieso, Alejandro, Benzaazoua, Mostafa, Cisternas, Luis A.

“…•Covellite flotation was studied using pure natural covellite and porphyry ores.•Covellite has a natural flotation yield with recovery around 55% and is not…”
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Effect of frother addition mode on gas dispersion and coal flotation in a downflow flotation column by Zhu, Hongzheng, Zhu, Jinbo, López Valdivieso, Alejandro, Min, Fanfei, Song, Shaoxian, Wang, Hainan

“…•A novel surfactant addition mode of flotation was proposed to reduce the surfactant waste.•Surfactant vapor mode presented higher aeration rate, higher bubble…”
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Carboxymethylcellulose (CMC) as PbS depressant in the processing of Pb-Cu bulk concentrates. Adsorption and floatability studies by López-Valdivieso, Alejandro, Lozano-Ledesma, Luis A., Robledo-Cabrera, Aurora, Orozco-Navarro, Oscar A.

“…[Display omitted] •Carboxymethylcellulose (CMC) adsorbs on PbS through bonding with PbOH+.•Oxidizing the PbS surface enhances CMC adsorption.•CMC and xanthate…”
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Formation of micro-fractures on an oolitic iron ore under microwave treatment and its effect on selective fragmentation by Song, Shaoxian, Campos-Toro, Ernesto Fabian, López-Valdivieso, Alejandro

“…In this work the fragmentation of a Chinese oolitic iron ore along the boundaries of hematite and gangue minerals by means of microwave pretreatment was…”
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Reexamining the Adsorption of Octyl Hydroxamate on Malachite Surface: Forms of Molecules and Anions by Li, Zhili, Rao, Feng, Song, Shaoxian, Uribe-Salas, Alejandro, López-Valdivieso, Alejandro

“…The adsorption of chelating collector octyl hydroxamate onto malachite was studied at various pH to reveal the adsorption mechanism. Below pH 6, a substantial…”
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