A Comparison of Direct Concentrating Solar Thermal Treatment of Manganese Ores to Fossil Fuel Based Thermal Treatments

14 Pages Posted: 22 Sep 2021

See all articles by Lina Hockaday

Lina Hockaday

Mintek

Quinn Reynolds

Mintek

Craig McGregor

University of Stellenbosch - Solar Thermal Energy Group

Frank Dinter

University of Stellenbosch - Solar Thermal Energy Group

Date Written: September 12, 2021

Abstract

In South Africa, the world’s largest land-based manganese reserves occur in an area coincident with high annual solar irradiance. The use of direct concentrating solar thermal treatment, as opposed to fossil fuel based thermal treatment, reduces the CO2 emissions associated with thermal treatment of manganese ores greatly and could open new processing opportunities when scaled up.

The application of direct concentrating solar thermal treatment of manganese ores is compared to other thermal treatment methods. The evaluation is based on the results of exploratory on-sun experiments conducted in 2019. Pellets prepared from manganese ores, bentonite binder and charcoal were treated with concentrating solar radiation. The solar treated samples were analyzed to determine changes to their mineralogy with X-ray diffraction and scanning electron microscopy. In addition, the solar treated pellets were tested to determine their compressive strength. The pellets did not pass the strength requirement of 500 N/pellet to qualify as feed for submerged arc furnaces. Results from these experiments were then further compared with other thermal treatments of manganese ores such as calcination, nodulizing, pelletizing, sintering and reductive roasting to evaluate the feasibility of applying concentrating solar thermal treatment in these treatment options. The direct concentrating solar thermal treatment was found to strengthen manganese pellets sufficiently to be considered dried and preheated for pelletizing but not cured. Temperatures were achieved suitable for calcination or reductive roasting of manganese ores, where agglomeration is not required.

Keywords: thermal treatment, direct concentrating solar thermal, manganese ores

Suggested Citation

Hockaday, Lina and Reynolds, Quinn and McGregor, Craig and Dinter, Frank, A Comparison of Direct Concentrating Solar Thermal Treatment of Manganese Ores to Fossil Fuel Based Thermal Treatments (September 12, 2021). Proceedings of the 16th International Ferro-Alloys Congress (INFACON XVI) 2021, Available at SSRN: https://ssrn.com/abstract=3926254 or http://dx.doi.org/10.2139/ssrn.3926254

Lina Hockaday (Contact Author)

Mintek ( email )

South Africa

Quinn Reynolds

Mintek ( email )

South Africa

Craig McGregor

University of Stellenbosch - Solar Thermal Energy Group ( email )

South Africa

Frank Dinter

University of Stellenbosch - Solar Thermal Energy Group ( email )

South Africa

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Downloads
98
Abstract Views
297
rank
359,224
PlumX Metrics