In this study cornstalk was used as reductant for reduction roasting of low-grade manganese dioxide ores, and sulfuric acid was used as leaching solvent for the roasted ore. The effects of weight ...

Techno-economic evaluation and sensitivity analysis have also been carried out. Studies indicated that roasting of ferruginous manganese ores at a commercial Direct Reduced …

Abstract: Egyptian low grade manganese ore pellets were reduced by hydrogen in this work in the temperature range 750-950ºC. The results indicated that the reduction rate increased with ...

Studies indicated that roasting of ferruginous manganese ores at a commercial Direct Reduced Iron plant is an adaptable and sustainable solution to …

Reduction roasting of manganese ores is a known process; however, it is not yet commercialized mainly due to various techno-economic issues. The current research work presents results of a large-scale plant trial performed at a commercial Direct Reduced Iron making plant to upgrade low-grade ferruginous manganese ores (Mn: 25–32%, Mn/Fe: …

The low-grade nickel laterite ore used in this study was successfully upgraded through selective reduction by industrialized rotary kilns followed by magnetic separation.

The effect of extended milling on the carbothermic reduction of a manganese ore has been examined using a combination of thermal analysis and X-ray diffraction (XRD).

A rotary kiln (Φ1.5 m × 15 m) was designed to verify feasibility of the reduction technology of a low grade iron ore with low temperature via ore-coal composites.

Semantic Scholar extracted view of "Preparation of Reduced Iron Powder from High-Phosphorus Iron Ore: A Pilot-Scale Rotary-Kiln Investigation" by Jin-xiang You et al.

With the depletion of high-grade manganese ores, Mn ore tailings are considered valuable secondary resources. In this study, a process combining high-gradient magnetic separation (HGMS) with hydrometallurgical methods is proposed to recycle fine-grained Mn tailings. The Mn tailings were treated by HGMS at 12,500 G to obtain a Mn …

The growing need of electrolytic manganese dioxide (EMD) for different battery usage in automobile and energy sectors could create a gap in the supply and demand of manganese. There is an urgent necessity for eco-friendly and efficient technologies to boost the production of manganese from low-grade ores as well as postconsumer …

In recent years, manganese has gradually played a significant role in the fields of dietary additives, fertilizers, cells, and fine chemicals [6,7]. With the massive consumption of high-grade manganese ore, development and utilization of low-grade manganese and ferromanganese ores have gradually become part of the agenda.

Effective utilization of low grade iron ore and low rank coal by excessive coal-based direct reduction process to coproduce DRI powder and semi-coke can be one of the solutions to cut the high ...

A tunnel kiln reduction roasting method of high-valence manganese oxide ores includes evenly mixing the high-valence manganese oxide ores and sulphur to obtain a mixture; placing the mixture into a closed reaction tank and using a tunnel kiln for heating, reduction roasting and cooling; and cooling a roasting product under an air-free …

The utilization of low-grade manganese ores has become necessary due to the intensive mining of high-grade ores for a long time. In this study, calcined ferruginous low-grade manganese ore was ...

The efficient utilization of manganese dioxide (MnO2) ore is essential for the sustainable development of manganese (Mn) industry. Confronting the great challenge of chemical engineering scale-up ...

Premilling of a manganese ore, comprised of cryptomelane, braunite and an unidentified manganese phase with graphite led to enhanced reduction at decreased temperatures.

Moreover, compared with reducing low-grade pyrolusite with coal reductant by rotary kiln reduction method, the same reduction ratio obtained by microwave heating can be achieved, with the ...

The rapid depletion in the grade of manganese ore due to ever-growing demand of manganese metal is one of the reasons for this consumption and production …

Calcined ore temperature = 863°C +/- 2°C with higher temperatures inside the kiln and thus different thermal profile. Slight decrepitation and blow off ultrafines. Improved …

An innovative technical route has been proposed to improve recycling efficiency of Ni and Fe from low-grade nickel laterite via the duplex process between direct reduction-magnetic separation and rotary kiln-electric furnace. The results indicated that the high‑nickel concentrates produced from direct reduction-magnetic separation …

The method and the device can reduce and roast the high/low-grade manganese dioxide ore, have the advantages of low production cost, simple process and convenient operation, can control the reduction rate of manganese dioxide and other metals through the automatic discharging device, and improve the quality of final products.

The production of high carbon ferromanganese alloys is traditionally carried out by smelting oxidized ores in electric furnaces using carbonaceous material as reducing agent, generating CO2 emissions which contribute to climate change. The actual carbon consumption is not optimal, there is an overconsumption linked to an incomplete …

Calcined ore temperature = 863°C +/- 2°C with higher temperatures inside the kiln and thus different thermal profile. Slight decrepitation and blow off ultrafines. Improved permeability. Important decrepitation.

This paper presents an innovative technology that has been developed for the smelting of Egyptian low-grade manganese ore to produce low-manganese pig iron and high-manganese slag.

Manganese dioxide is typically reduced to a bivalent state before being extracted; here, sulfur is considered an efficient reductant and sulfur–based reduction has been industrialized in China. In this study, the reaction mechanism between MnO2 and gaseous sulfur was investigated. Thermodynamically, the reduction of MnO2 by …

Iron appears partially in ore as individual hematite and goethite grains and the remainder of it is in the manganese grains. The laboratory tests showed that the Mn / Fe ratio increased up to 11 when the pre-reduction of ore was performed in a …

A process with coal-based direct reduction followed by magnetic separation is presented for recovering metallic iron from high-phosphorus oolitic hematite in this study.

In this study, low-grade saprolite laterite, as the primary object, was conducted to enhance the reduction process and growth of Fe-Ni alloy particles by co-reduction with limonitic laterite ore and optimization of binary basicity, which are expected to improve the recovery of nickel and iron with better economic efficiency than before. …

The reduction of higher manganese oxides to MnO in the prereduction zone of a ferromanganese furnace is largely decisive for the overall energy efficiency and climate gas emissions for the overall production process. Kinetics of the gas-solid reaction between the ore and CO(g) in the ascending furnace gas is dependent on the ore …