Effect of Sodium Carbonate on Phase Transformation of High-Magnesium Laterite Ore

Abstract

The phase transformation of high-magnesium laterite ore were investigated during the reduction roasting process. In the absence of sodium carbonate [Na 2 CO 3 ], the X-ray diffraction results indicate that the [Fe Ni] alloy existed in ore in the form of taenite. The taenite particles is ne and the size is approximately 30-40 nm, which indicate that the nickel and iron are not migrated and aggregated during the non-smelting reduction roasting process. In the presence of sodium carbonate, the intensity of [Fe Ni] alloy phase increases; the taenite diffraction peaks disappears, corresponding to the appearance of kamacite. The results of SEM images show that the [Fe Ni] alloy particle size has a signi cant increase with the addition of Na 2 CO 3 . Based on the theoretical analysis, the pivotal role of Na 2 CO 3 may be mainly attributed to the Na + , which could in ltrate into the crystal lattice of FeO, leading to the lattice distortion. Furthermore, the sodium carbonate would be decomposed at high temperature, and the generated CO 2 could promote the Boudouard reaction which produced the CO to enhance the reduction of metallic oxides within ore.

Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture

“…Both MFC and CMC show typical peaks of cellulose structure at 22.6 and 15.6°, while the sharp peaks at 31.8 and 45.5°in the CMC spectrum correspond to inorganic content constituting the sodium salts. 36,37 The sharp prominent peak of the 002 plane, characteristic of pure MFC, is found to be notably influenced by functionalization. Small molecules (CMC and β-alanine) are found to elicit no obvious shifts in the peaks; therefore, they present only small changes in the crystal structure.…”

“…The characteristic peaks and crystallinity index of nanocellulose and functionalized nanocellulose.Both MFC and CMC show typical peaks of cellulose structure at 22.6⁰ and 15.6⁰ while the sharp peaks at 31.8⁰ and 45.5⁰ in the CMC spectrum correspond to inorganic content constituting the sodium salts36,37 . The sharp prominent peak of the 002 plane, characteristic of pure MFC, is found to be notably influenced by functionalization.…”

Reduction of Nickel and Iron from Low-Grade Nickel Laterite Ore via a Solid-State Deoxidization Method Using Methane

“…With a further increase in the temperature, to 700°C, the mineral phase of the nickel laterite ore changed significantly, and the amorphous magnesium silicate recrystallized to form a forsterite phase (Mg 2 SiO 4 ) and enstatite phase (MgSiO 3 ). 21) The formation of the forsterite phase results in a decrease in the metallization rate of nickel. As the temperature increased, the nickel-iron nuclei continued to grow, while the peaks of ¡-Fe and Awaruite[FeNi 3 ] gradually increased because of the presence of greater quantities of metal iron.…”

Bismuth Nanobowl/Bismuth Oxides, a Hybrid Material for Efficient Adsorption and Visible‐light‐driven Photodegradation of Organic Pollutants

“…Morphology has a great impact on the performance of materials in the period of catalysis. In past several decades, Bi metal with various morphologies, such as nanotubes, nanowires, nanocubes, nanoparticles, triangular nanoplates, nanospheres and hollow nanospheres have been successfully synthesized . Recently, Fan and co‐workers reported that bismuth hollow nanospheres are efficient in Cr (VI) adsorption .…”