Investment in new tungsten mining projects

Sánchez, Álvaro Bueno; Krzemień, Alicja; Fernández, Pedro Riesgo; Rodríguez, Francisco Javier Iglesias; Lasheras, Fernando Sánchez; Juez, Francisco Javier de Cos

doi:10.1016/j.resourpol.2015.10.003

Cited by 32 publications

(17 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…High initial investment cost is among the critical challenges facing renewable energy development in most developing countries including Tanzania [48]. Initial investment is a unique and essential tool for any project development [98] as it enhances investor's confidence and reduces the financial gap [99]. There are few or no incentives for local manufacturing or importation of renewable energy equipment such as solar devices [71].…”

Section: High Initial Investment Costmentioning

confidence: 99%

The Potential Renewable Energy for Sustainable Development in Tanzania: A Review

2018

View full text Add to dashboard Cite

Currently, renewable energy development is emphasized for sustainable development goals accomplishment and the better realization of sustainable development globally. Tanzania, like other developing countries, is striving to adopt different ways of ensuring affordable and accessible energy supply to its socioeconomic and political sectors to achieve renewable energy development. To secure affordable and accessible energy in the country, renewable energy is termed as an alternative energy source because of it is environmentally friendly. If renewable energy is produced and utilized in a modern and sustainable manner, it will help to eliminate energy problems in Tanzania. Thus, this study aims to review the current potential renewable energy for the achievement of sustainable development in Tanzania. Moreover, challenges of renewable energy development are examined.

show abstract

Section: High Initial Investment Costmentioning

confidence: 99%

The Potential Renewable Energy for Sustainable Development in Tanzania: A Review

2018

View full text Add to dashboard Cite

show abstract

“…where→ y is the dependent variable predicted by the MARS model, c 0 is a constant, B m (x) is the mathematical base function, which can be a simple spline base function, and c m is the coefficient of the mathematical base function. The MARS technique builds its model in two stages, the "step forward" and the "step back" [17][18][19]. In reference to the "step forward", MARS begins with a model containing only the intercept term, which is the mean of the response values.…”

Section: Multivariate Adaptive Regression Splines Methods (Mars)mentioning

confidence: 99%

“…In this way, the GCV is the means of the square residual error divided by a value that depends on the complexity of the model. The criterion for the GCV is defined as follows [17,18]:…”

Section: Multivariate Adaptive Regression Splines Methods (Mars)mentioning

confidence: 99%

Comparative Modeling of a Parabolic Trough Collectors Solar Power Plant with MARS Models

et al. 2017

View full text Add to dashboard Cite

Power plants producing energy through solar fields use a heat transfer fluid that lends itself to be influenced and changed by different variables. In solar power plants, a heat transfer fluid (HTF) is used to transfer the thermal energy of solar radiation through parabolic collectors to a water vapor Rankine cycle. In this way, a turbine is driven that produces electricity when coupled to an electric generator. These plants have a heat transfer system that converts the solar radiation into heat through a HTF, and transfers that thermal energy to the water vapor heat exchangers. The best possible performance in the Rankine cycle, and therefore in the thermal plant, is obtained when the HTF reaches its maximum temperature when leaving the solar field (SF). In addition, it is necessary that the HTF does not exceed its own maximum operating temperature, above which it degrades. The optimum temperature of the HTF is difficult to obtain, since the working conditions of the plant can change abruptly from moment to moment. Guaranteeing that this HTF operates at its optimal temperature to produce electricity through a Rankine cycle is a priority. The oil flowing through the solar field has the disadvantage of having a thermal limit. Therefore, this research focuses on trying to make sure that this fluid comes out of the solar field with the highest possible temperature. Modeling using data mining is revealed as an important tool for forecasting the performance of this kind of power plant. The purpose of this document is to provide a model that can be used to optimize the temperature control of the fluid without interfering with the normal operation of the plant. The results obtained with this model should be necessarily contrasted with those obtained in a real plant. Initially, we compare the PID (proportional–integral–derivative) models used in previous studies for the optimization of this type of plant with modeling using the multivariate adaptive regression splines (MARS) model.

show abstract

“…On the other hand, scheelite is mainly encountered in skarn deposits, which account for more than 40% of the global current estimated tungsten reserves [2]. The classification of tungsten as a critical metal resulted in a global resurgence of interest for these ores [5][6][7]. In such deposits, scheelite is found in fine-grained mineralizations disseminated thorough the orebody and commonly associated with other calcium-bearing minerals such as calcite, dolomite, fluorite, and apatite [5,[7][8][9].…”

Section: Challenges In Tungsten Ore Processingmentioning

confidence: 99%

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

et al. 2019

View full text Add to dashboard Cite

Scheelite (CaWO4) is one of the main raw material for the production of tungsten. It is usually encountered in skarn deposits where it is commonly associated with other calcium minerals as fluorite, apatite, and calcium silicates. Worldwide, scheelite is upgraded to the chemical grades by direct flotation, but the separation efficiency remains limited due to similar flotation behaviors of scheelite and gangue minerals with fatty acid. The only solutions used to overcome this issue involve high energy consumption or ecotoxic reagents. In the present study, a novel method based on the use of a centrifugal Falcon concentrator was investigated to perform an efficient elimination of gangue minerals and fine particles as well as an acceptable scheelite recovery enabling a decrease of the flotation reagents consumption. The performances of the two types of laboratory Falcon bowls, Falcon UltraFine (UF) and Falcon Semi-Batch (SB), were modeled using the design of experiments (DoE) methodology, which allowed to determine the best operating parameters for each bowl. The separation performances were mainly affected by the rotary speed and the pulp density for the Falcon UF and by the rotary speed and the fluidization pressure for the Falcon SB. Due to the fluidization pressure, the Falcon SB exhibited higher gangue minerals rejection with slightly lower recoveries than the Falcon UF. Overall, the optimized Falcon SB test allowed to reach 71.6%, 22.6%, 17.2%, and 12.6% for scheelite, calcium salts, dense calcium silicates, and light non-calcic silicates respectively while the desliming efficiency reached 98.8%. For comparison purposes, a classical hydrocyclone allowed to attain 89.1%, 89.3%, 79.5%, and 76.5% for scheelite, calcium salts, dense calcium silicates, and light non-calcic silicates respectively while the desliming efficiency reached 52.0%. Theses results can be used reliably to assess the separation performances of an industrial Falcon C which can be regarded, along with Falcon SB, as a sustainable and efficient gangue rejection method for complex W skarn ore, which allows the use of environmentally friendly reagents during downstream flotation stages.

show abstract

Investment in new tungsten mining projects

Cited by 32 publications

References 6 publications

The Potential Renewable Energy for Sustainable Development in Tanzania: A Review

The Potential Renewable Energy for Sustainable Development in Tanzania: A Review

Comparative Modeling of a Parabolic Trough Collectors Solar Power Plant with MARS Models

Application of Falcon Centrifuge as a Cleaner Alternative for Complex Tungsten Ore Processing

Contact Info

Product

Resources

About