Oct 15, 1997 The present invention concerns a process for iron ore pellets production comprising at least one iron ore crushing stage in a roller press for the production of iron ore pellets. The crushing stage(s) can be done prior or after grinding, or still defined by successive passages of the material through the foregoing crushing stage.
Sep 24, 2020 In the tests carried out, GreenIron has already reduced iron ore to 96 entirely without CO2 emissions. GreenIron currently has four patents in the PCT phase (global patents) for its zero-emission method of reducing metal oxides to pure metals. The material to be processed must initially be pelletized before insertion into the furnace.
The present invention relates to a process for producing sponge iron or pig iron from iron ore reduced in a reduction shaft furnace by means of a hot reduction gas to sponge iron, which is introduced into the shaft furnace level with the bustle plane at a temperature in the range between 750 and 900 C. as well as below the bustle plane, together with an apparatus for performing.
Jul 11, 2018 The iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. However, the content of iron in ore deposits has deteriorated and low-grade iron ore has been processed. The fines resulting from the concentration process must be agglomerated for use in iron and steelmaking. This chapter.
A review on the patents published by the two companies was performed in this work and it was possible to describe the functioning of both process, the developments over the years and to distinguish the differences. Both process are based on shaft furnaces where reducing gases flow in countercurrent to iron ore pellets heating them and reducing.
Mar 20, 2017 Some experimental work performed by the writer in 1911 under a Carnegie Research Scholarship of the Iron and Steel Institute of Great Britain, and the work of others, serve to show the metallurgical possibilities of the electric furnace for the production of pig steel from ore, and whether the process satisfies the five stated requirements.
United States Patent 4248623 . Abstract A process for the direct reduction of iron ore in a shaft furnace having an upper reducing zone and a lower cooling zone in which reducing gas is introduced to the furnace at the bottom of the reducing zone around the periphery of the furnace, exhausted reducing gas or top gas is removed from the top of.
Iron ore pellet process control . United States Patent 4131668 . Abstract A method for controlling an iron ore pelletizing and pellet processing operation by evaluating the results of the on-stream analysis of the apparent specific gravity or apparent density distributions of the dry and fired pellet samples which permits the operator of the.
Over the past decade, Rio Tinto has developed a laboratory-proven process that combines the use of raw, sustainable biomass with microwave technology to convert iron ore to metallic iron during the steelmaking process. The patent-pending process, one of a number of avenues the company is pursuing to try to lower emissions in the steel value.
Iron ore is the key raw material for steel production enterprises. Generally, iron ore with a grade of less than 50 needs to be processed before smelting and utilization. After crushing, grinding, magnetic separation, flotation, and gravity separation, etc., iron is gradually selected from the natural iron ore.
Oct 07, 1996 United States Patent 5810905 . Abstract A process for producing pig iron from iron ore fines wherein the fines are partially reduced in a fluid bed reactor and, without pelletizing, briquetting or otherwise agglomerating the partially reduced fines, injecting them with a lance below the surface of a bath of a submerged arc furnace.
The idea of rolling moist fine ore in a drum to form balls and then drying and firing it was first patented by A. G. Andersson in Sweden in 1912. Further development was performed to bring the idea to reality. In 1943, E. W. Davies and co-workers demonstrated the process using an experimental shaft furnace.
Charcoal, iron ore and air are combined to smelt an iron “bloom” 1949 for a patent on his Ce process in hypereutectic irons. The INCO main patent and the patent on improved cast iron 2,485,760 and 2,485,761, respectively, were granted October 25, 1949. The Ce patent was granted November 15, 1949 to BCIRA.
Nov 23, 2021 Brazilian miner Vale has restarted the process of acquiring environmental licenses for its Apolo iron ore project in the state of Minas Gerais following a major revision of the original plan, the.
Mar 16, 2013 Iron ore is used mostly in pellet and or lumpy form. Oxygen (O2) is removed from the iron ore by chemical reactions based on H2 and CO for the production of highly metalized DRI. In the direct reduction process, the solid metallic iron (Fe) is obtained directly from solid iron ore without subjecting the ore or the metal to fusion.
Process of making iron from the ore. This web page summarizes information in PubChem about patent US-816142-A. This includes chemicals mentioned, as reported by PubChem contributors, as well as other content, such as title, abstract, and.
Nov 24, 2021 Vale has reportedly reinitiated the environmental licensing process for the Apolo iron ore project in Minas Gerais, Brazil. The move comes after the completion of a ‘major revision’ of the mine’s original plan, reported Reuters citing the firm as saying in a presentation made to the Minas Gerais state assembly.
Beneficiation process for oxidized iron ore . United States Patent 4246025 . Abstract A chlorine source is provided in a reactor in combination with a ground oxidized ore and a particulate carbonaceous reductant. The amount of chlorine provided is significantly less than the stoichiometric requirements for reaction with the total iron content.
Oct 25, 2013 In one embodiment, the invention provides an iron ore concentration process with grinding circuit, dry desliming and dry concentration, wherein the process comprises the steps of a) crushing an ore b) dry grinding of the ore crushed in step a) c) dry desliming of the ore grinded in step b) and d) magnetically separating the ore deslimed in step c), resulting in a.
Oct 25, 2013 Justia Patents With Modifying Agents US Patent for Iron ore concentration process with grinding circuit, dry desliming and dry or mixed (dry and wet) concentration Patent (Patent 10,207,275).
Jan 12, 2001 The granular iron ore is pre-heated with the hot waste gas and a hot, granular mixture of iron ore and semi-coke is drawn off as a product from the reactor and or the separator. Said carbonising reactor can be embodied as a fluidised.
United States Patent 4019724 . Abstract A process and apparatus for the gaseous reduction of sized iron ores wherein a steam-hydrocarbon fluid mixture, having a steam carbon molar ratio ranging from 0.9 1 to 1.8 1, is catalytically reformed to produce a reducing gas mixture containing about 85 to 98 by volume carbon monoxide plus hydrogen.
May 24, 2016 Beneficiation of Iron Ore and the treatment of magnetic iron taconites, stage grinding and wet magnetic separation is standard practice.This also applies to iron ores of the non-magnetic type which after a reducing roast are amenable to magnetic separation. All such plants are large tonnage operations treating up to 50,000 tons per day and ultimately requiring.
Virgin iron added to dilute the tramp elements such as copper and zinc to improve final product quality • DRI – D irect R educed I ron is one of the iron products added to the scrap to increase purity • DRI is iron ore that has been reduced to iron with syngas without melting • DRI processes in U.S. generally use natural gas to reduce.