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Humberto Estay   Dr.  University Educator/Researcher 
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Humberto Estay published an article in October 2018.
Research Keywords & Expertise
0 A
0 Gold
0 Mining
0 Modeling
0 Optimization
0 Process Intensification
Top co-authors
Julio Romero

15 shared publications

Laboratory of Membrane Separation Processes (LabProSeM)

Elizabeth Troncoso

8 shared publications

Department of Chemistry; Universidad Tecnológica Metropolitana; Las Palmeras 3360 Ñuñoa Santiago Chile

Minghai Gim-Krumm

2 shared publications

Advanced Mining Technology Center (AMTC), University of Chile, Av. Tupper 2007 (AMTC Building), Santiago 8370451, Chile

Michelle Quilaqueo

1 shared publications

Advanced Mining Technology Center (AMTC), University of Chile, Av. Tupper 2007 (AMTC Building), Santiago 8370451, Chile

Publication Record
Distribution of Articles published per year 
Total number of journals
published in
Article 0 Reads 0 Citations A comprehensive study of glucose transfer in the human small intestine using an in vitro intestinal digestion system (i-... Minghai Gim-Krumm, Pablo Donoso, Rommy N. Zuñiga, Humberto E... Published: 01 October 2018
Journal of Membrane Science, doi: 10.1016/j.memsci.2018.07.080
DOI See at publisher website
Article 1 Read 0 Citations Two-Stage SART Process: A Feasible Alternative for Gold Cyanidation Plants with High Zinc and Copper Contents Humberto Estay, Minghai Gim-Krumm, Michelle Quilaqueo Published: 07 September 2018
Minerals, doi: 10.3390/min8090392
DOI See at publisher website ABS Show/hide abstract
The SART (sulfidization, acidification, recycling, and thickening) process (SP) has been successfully implemented in gold cyanidation plants to address issues associated with high cyanide-soluble copper content ores. However, this process could produce a relatively low grade precipitate, decreasing the sale price when gold plants have high zinc and copper content in their solutions. A potential option in this case would be the use of a two-stage SART process (TSSP) to produce separate zinc and copper precipitates. The additional equipment involved with this process would increase the capital cost, thereby generating concerns about the optimal range of metal contents that could justify this option. This study presents a methodology to quantify the feasible range of Cu/Zn concentrations that would justify a two-stage SART process. The study is based on a thermodynamic model and a simple economic evaluation. Results show the TSSP is preferred when the Cu/Zn ratio ranges between 0.2 and 1.5 with copper concentration higher than 500 mg/L. The TSSP appears to be a viable option to consider for gold plants having concentrations of copper and zinc higher than 200 mg/L for both metals.
Article 2 Reads 0 Citations Assessment of Industrial Modules to Design a GFMA Process for Cyanide Recovery Based on a Phenomenological Model Humberto Estay, Elizabeth Troncoso, René Ruby-Figueroa, Juli... Published: 11 April 2018
Processes, doi: 10.3390/pr6040034
DOI See at publisher website ABS Show/hide abstract
Cyanide recovery in the gold-mining industry is a crucial step in terms of the cost of operation. Currently, a process such as AVR (acidification, volatilization and recycling), based on packed towers for stripping and absorption stages, addresses this issue with high levels of investment and operational costs. Gas-filled membrane absorption (GFMA) emerges then as an attractive alternative because the stripping and absorption stages can be performed in a single stage, reducing associated investment and operational costs. Despite the advantages of this technology, applications at industrial scale are still emerging. A possible reason is the lack of clear scaling-up methodologies where experimental data can be taken to select the optimum industrial hollow-fiber membrane contactor module (HFMC). The present study proposes a methodology to select adequately between available industrial Liqui-CelTM modules to design a process under optimal operational conditions. The methodology is based on a phenomenological model developed for recovering cyanide by using the GFMA process. Simulation of the Liqui-CelTM industrial membrane modules employed to recover cyanide in the GFMA process, both in a batch arrangement with a feed-flow rate, and in the range 10–125 m3/h, showed that in terms of cyanide recovery there are no differences between the modules tested when they work at the same feed-flow rate. The design criteria to scale-up was determined: to ensure performance at different scales, the length of the transfer unit (HTU) should be kept at different capacities of HFMC modules that comprise the equipment characteristics (mass-transfer area, stream velocities, and mass-transfer coefficient values). Additionally, the number of commercial modules Liqui-CelTM required to treat 57 m3/h and 250 m3/h ensuring a cyanide recovery of 95% was also determined. Finally, the most profitable option (lower pressure drop and module cost) resulted in the use of the 14 × 40 Liqui-CelTM module.
Article 3 Reads 1 Citation Designing the SART process – A review Humberto Estay Published: 01 March 2018
Hydrometallurgy, doi: 10.1016/j.hydromet.2018.01.011
DOI See at publisher website