This page has only limited features, please log in for full access.

Dr. Jane Mulenshi
Lulea University of Technology

Basic Info


Research Keywords & Expertise

0 Geometallurgy
0 Mineral Processing
0 Tungsten
0 Characterisation
0 Tailings

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 16 March 2021 in Sustainability
Reads 0
Downloads 0

Innovative tungsten (W) extraction techniques are continually being sought because of challenges of low leaching efficiencies, despite using advanced processing units such as autoclaves operating high temperatures and pressures. Compared to conventional leaching, mechanochemical treatment improves the efficiency of leaching. Therefore, in this study, an innovative mechanochemical treatment method, referred to as leaching while grinding (LWG), was employed as a reprocessing option to optimize W recovery from historical tungsten tailings. Experiments were run using the regular two-level factorial design to screen through the four factors of stirrer speed, liquid/solid ratio, temperature, and digestion time to assess their criticality and effects in the LWG process. The stirrer speed and the liquid/solid ratio were the most critical factors in the optimization of W recovery. The maximum W recovery (91.2%) was attained at the highest stirrer speed (410 rpm), low liquid/solid ratio (0.8), long digestion time (6 h), and low leaching temperature (60 °C). The attained low leaching temperature (60 °C) was due to the mechanical activation of scheelite resulting from the simultaneous grinding and leaching. For such low- grade W material, liquid/solid ratio optimizing is critical for maintaining the digestion mixture fluidity, and for environmental and economic sustainability regarding the sodium hydroxide (NaOH) consumption, which was low.

ACS Style

Jane Mulenshi; Saeed Chelgani; Jan Rosenkranz. Mechanochemical Treatment of Historical Tungsten Tailings: Leaching While Grinding for Tungsten Extraction Using NaOH. Sustainability 2021, 13, 3258 .

AMA Style

Jane Mulenshi, Saeed Chelgani, Jan Rosenkranz. Mechanochemical Treatment of Historical Tungsten Tailings: Leaching While Grinding for Tungsten Extraction Using NaOH. Sustainability. 2021; 13 (6):3258.

Chicago/Turabian Style

Jane Mulenshi; Saeed Chelgani; Jan Rosenkranz. 2021. "Mechanochemical Treatment of Historical Tungsten Tailings: Leaching While Grinding for Tungsten Extraction Using NaOH." Sustainability 13, no. 6: 3258.

Journal article
Published: 13 March 2021 in Journal of Geochemical Exploration
Reads 0
Downloads 0

As the need to address environmental concerns in mining and the demand for critical metals and minerals increase, historical tailings are among the mining waste repositories being sought after. However, there is only limited information available about such repositories, and hence there is a need to fill these knowledge gaps. In this paper, a conceptual framework is proposed for how relevant information about historical tailings can be generated and structured in a systematic manner. The case of the closed Yxsjöberg mine in Sweden is used to demonstrate how this framework is being used. A site-specific sampling strategy and technique was identified, and based on the observed lithology, tailings particles were studied to understand their distribution across the repository. Using Mineral Liberation Analysis (MLA), the modal mineralogy, mineral associations, and mineral liberation by particle size of the tailings were determined. The Smaltjärnen tailings repository of Yxsjöberg has potential for critical metals and minerals, including tungsten (W) and fluorite (CaF2) but also contains minerals of environmental concern as pyrrhotite and pyrite. It has on average 0.15% WO3 concentration in the sampled locations, indicating approximately 3300 tons of WO3 in the repository. Scheelite mineral grains are mostly (>50 wt%) locked in tailings particles that have a number of mineral grains (binary, ternary or even more complex) in the dominating particle size fraction −600 to +149 μm. Mineral locking is mostly with calcium-bearing minerals ilvaite, fluorite and garnet-gross-andradite. Pyrrhotite has been the most reactive acid-generating mineral, and hence is more depleted than pyrite in the weathered locations. The heterogeneity of tailings across the repository suggests a possible existence of geometallurgical domains that require further assessment to evaluate their metallurgical performance. The obtained information and knowledge about these tailings will hereinafter be used to develop sustainable processes for remediation and recovery of the critical metals and minerals.

ACS Style

Jane Mulenshi; Sabine Gilbricht; Saeed Chehreh Chelgani; Jan Rosenkranz. Systematic characterization of historical tailings for possible remediation and recovery of critical metals and minerals – The Yxsjöberg case. Journal of Geochemical Exploration 2021, 226, 106777 .

AMA Style

Jane Mulenshi, Sabine Gilbricht, Saeed Chehreh Chelgani, Jan Rosenkranz. Systematic characterization of historical tailings for possible remediation and recovery of critical metals and minerals – The Yxsjöberg case. Journal of Geochemical Exploration. 2021; 226 ():106777.

Chicago/Turabian Style

Jane Mulenshi; Sabine Gilbricht; Saeed Chehreh Chelgani; Jan Rosenkranz. 2021. "Systematic characterization of historical tailings for possible remediation and recovery of critical metals and minerals – The Yxsjöberg case." Journal of Geochemical Exploration 226, no. : 106777.

Journal article
Published: 02 December 2019 in Processes
Reads 0
Downloads 0

Repositories of historical tungsten mining tailings pose environmental risks, but are also potential resources for valuable metals. They still contain large tonnages of useful minerals and metals, reflecting the inefficient extraction methods and/or low metal prices at the time they were mined. The focus of this study is to evaluate the technical viability of reprocessing the tailings to recover some of the contained valuable minerals and metals, as well as reducing the negative environmental impact associated with the tailings. Geometallurgical studies were conducted on drill core samples taken from the Smaltjärnen tailings repository of the closed Yxsjöberg tungsten mine, Sweden. The collected samples were characterized physically, chemically, and mineralogically. Knelson concentrator dry low- and high-intensity magnetic separation methods were tested as potential beneficiation methods. The tailings are dominated by the −600 to +149 µm particles. The highest concentration of tungsten (W) was 0.22% WO3. Using a Knelson concentrator, scheelite (main W mineral) recovery was enhanced, with 75 wt.% tungsten recovered in the 34 wt.% heavy concentrate. Only 1.0 wt.% sulphur (S) reported to the non-magnetic fraction. Based on the findings, a methodology and a preliminary process flowsheet for reprocessing the tailings is proposed.

ACS Style

Jane Mulenshi; Pourya Khavari; Saeed Chehreh Chelgani; Jan Rosenkranz. Characterization and Beneficiation Options for Tungsten Recovery from Yxsjöberg Historical Ore Tailings. Processes 2019, 7, 895 .

AMA Style

Jane Mulenshi, Pourya Khavari, Saeed Chehreh Chelgani, Jan Rosenkranz. Characterization and Beneficiation Options for Tungsten Recovery from Yxsjöberg Historical Ore Tailings. Processes. 2019; 7 (12):895.

Chicago/Turabian Style

Jane Mulenshi; Pourya Khavari; Saeed Chehreh Chelgani; Jan Rosenkranz. 2019. "Characterization and Beneficiation Options for Tungsten Recovery from Yxsjöberg Historical Ore Tailings." Processes 7, no. 12: 895.