Behavior of niobium, manganese and phosphorus during reducing roasting of rare earth-rare metal ore of the Chuktukon deposit

The article examines research on high-temperature reducing roasting of rare-earth-rare metal ores of the Chuktukon deposit. The effect of process temperature and consumption of reducing agent (coke) on distribution of niobium, manganese and phosphorus between metal and slag phases was studied. It was shown that a decrease in coke consumption in the range of 15–19 % promotes an increase in the extraction of niobium and manganese into the slag phase, while the reduction of phosphorus to metal increases with an excessive consumption of the reducing agent.

Solid-Phase Reduction and Separation of Iron and Phosphorus from Manganese Oxides in Ferromanganese Ore

The possibility of joint solid-phase reduction of iron and phosphorus from ferromanganese ore has been experimentally confirmed. Solid-phase reduction was performed at a temperature of 1000°C and exposure time of 2-5 hours, in a CO atmosphere, also produced the separation of the reduction products by melting. The distribution of iron and phosphorus was studied using an electron scanning microscope. The phase analysis of the samples was studied using a Rigaku Ultima IV X-ray diffractometer. The results were processed using the "Match" software. Reducing roasting in a CO atmosphere provides a transition from the oxide phase to the metallic phase of only iron and phosphorus without loss of manganese, thus increasing the concentration of MnO oxide in the residual oxide phase of the ore.

Elaboration of an environmentally appropriate technology of siderite ores concentration

Decrease of iron content in siderite ores, mined in mines stipulated a necessity to elaborate technologies of their concentration, which allow increasing iron content at least 35%. As a result of analysis of existing technologies of minerals concentration it was determined, that X-ray radiometric method is the most promising one for siderite ores concentration. Its essence is in a controlled supply of lump material of definite size, distribution of lump flows by streams and by the piece supply of ore lumps into analysis-division zone, in which the X-ray fluorescent analysis of main chemical elements takes place. Special microprocessor means of the measuring-control system make comparison of measuring results with the set threshold of separation and make decisions to direct the particular piece to one of the grading product. As the result, the particular piece comes to a chute either with rich product or by free fall comes to the chute of poor product. Tests of the technology of lump siderite ore separation accomplished by using industrial X-ray radiometric separators. Influence of ore size on the concentration process indices studied. It was determined, that at implementation the X-ray radiometric method of separation it is reasonable to limit by machine classes of 250– 100 mm and 100–30 mm. A technological flowchart proposed to provide the concentrate obtaining with the size of 30–10 mm and iron content of 35%. The concentrate can be used for reducing roasting of it in shaft furnaces. The formed screenings after concentration in the high intensity fields were proposed to subject to metallization in the rotating furnaces or rotating hearth furnaces. The metallized product can be smelted in an ore-thermal furnace to obtain steel semi-product used in large-scale EAF.