Abstract:
A method and apparatus for producing iron ore pellets containing hematite is described. The pellets containing magnetite are exposed to microwave energy in a heat treatment furnace under oxidizing conditions to convert magnetite to hematite.
Abstract:
The invention relates to a process for the formation of pellets containing an ultra hard core coated with an encapsulating material, the process including the steps of suspending ultra hard core material in a flow of gas; contacting the ultra hard core material with encapsulating to form pellets, introducing the pellets into a rotating vessel and contacting the pellets with encapsulating material to form pellets of greater mass than the pellets introduced into the rotating vessel. The invention also relates to a pellet containing an ultra hard core coated with an encapsulating material whenever produced by a process as hereinbefore described.
Abstract:
Cermet material obtained from unused inert anodes, used inert anodes and cermet used in the production of inert anodes is beneficiated into a nonferrous metal concentrate composition from which metal values contained in the composition may be readily recovered by using a conventional smelting process. The invention also relates to the use of the composition in a smelting process for the recovery of metal values from the cermet composition of the invention.
Abstract:
Iron ore pellets are produced by a process in which the iron ore is mixed with additives necessary to adapt the desired chemical composition, and they are then pelletized in rotatory disks. The resultant elements are pellets which are taken to a straight grate furnace, where they undergo a thermal process, receiving additional mixtures of polymers or acrylic copolymers, polymers and vinyl acetate copolymers or synthetic oils which form a protective layer- to become resistant to abrasion, sticking, dust degradation and dust emission.
Abstract:
The invention relates to a method for sintering ferroalloy materials in a continuously operated band sintering process, in which method the pellets to be sintered are arranged on the sintering underlay as an essentially even pellet bed, which pellet bed is conveyed on the sintering underlay through the various steps of the sintering process, and in connection with the sintering process, gas is conducted through the pellet bed. According to the invention, at least the major part of the carbon-bearing material needed for heating the pellet bed up to the sintering temperature is fed onto the surface of ready-made pellets prior to bringing the pellets to the sintering step.
Abstract:
A method of stabilizing a fluidized bed in a fluidized bed roasting process for metal sulphide concentrate comprises the step of controlling the particle size distribution of the particulate material in the bed so that a minimum amount of no less than about 30 % of the concentrate falls in a size range of from about 100 to about 420 mu m. The minimum amount preferably falls in the range of from about 35 % to about 40 %. In one embodiment of the invention the particle size distribution is controlled by maintaining the amount of lead in the concentrate in a range from about 3 % to about 4 %, preferably 3.7 % to about 3.8 %. In another embodiment the particle size distribution is controlled by using a pelletized feed or by the combination of the steps of using a pelletized feed and regulating the lead content of the concentrate.
Abstract:
Regeneration of hydrochloric acid by hydrolysis of iron chloride in aqueous solution employs a Pelletiser (5) after preconcentration of acid solution in a "Pre-Evaporator" (1). Pelletiser (5) controls pellet mixture to between 12 % and 14 % free water by recycling dried solids from Roaster (3), from Screen (7), or from dust removal Cyclone (9), and waste liquid from Preconcentrator (1). Preconcentrator (1) is contacted with superheated gas from Fluid Bed Roaster (3). Rotary Drier (6) dries pellets with a con-current hot gas stream and the pellets are screened at (7) with oversize being sent to a Mill (8), undersize recycled to Pelletiser (5), and sized feed delivered to Roaster (3). HC1 is produced as gas offtake from Preconcentrator (1) and passes via a demisting Cyclone into adiabatic Absorption Process section (11), where weak acid liquor and water (10) are added as required.
Abstract:
The disclosure relates to a method for producing reduced manganese (Mn) pellets (1). The method is characterized in that the method comprises the steps of a)mixing dried manganese sulfate (MnSO4) fraction (2) with binder (3) to form a pelletizing mixture (4); b) pelletizing the pelletizing mixture (4) to produce Mn pellets (5); c) drying the Mn pellets (5); d) sintering the dried Mn pellets (5) to produces sintered pellets (6); and e)reducing the sintered pellets (6) for obtaining reduced Mn pellets (1). The disclosure further relates to ferromanganese pellets obtainable by the method according to the present disclosure and to a plant for producing reduced Mn pellets.
Abstract:
A process to beneficiate oxidized iron ore can include the steps of: (1) adding a polysaccharide to the oxidized iron ore; (2) adding at least one amine; and (3) adding at least one salt; wherein the pH of the process is below 10 and greater than 5.