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The development of new technologies and the increasing demand for mineral resources from emerging countries are responsible for significant tensions in the pricing of non-ferrous metals. Some metals have become strategic and critical because they are used in many technological applications such as flat panel TVs (indium), solar panel cells (indium), lithium-ion batteries for electric vehicles (lithium, cobalt), magnets (rare earth elements, such as neodymium and dysprosium), scintillators (rare earths), and aviation and medical applications (titanium); their availabilities remain limited. The secured supply of these metals is crucial to continue producing and exporting these technologies, and because the specific properties of these metals make them essential and difficult to substitute for a given industrial application. Hydrometallurgy have the advantages of being able to process low-grade ores, to allow better control of co-products, and have a lower environmental impact providing that the hydrometallurgical route is optimized and cheap. The need to develop sustainable, efficient, and cheap processes to extract metals from complex and poor polymetallic matrices is real. The aim of this book was to highlight recent advances related to hydrometallurgy to face new challenges in metal production.

n/a --- gold recovery --- metal extraction --- secondary raw materials --- degradation --- precipitation --- yttrium --- separation --- seawater --- chloride --- chalcopyrite --- metal recovery --- electrochemistry --- solvent extraction --- rare-earth elements --- cuprite --- scandium --- leaching --- surface product --- solid-liquid extraction --- phosphoric acid --- intermediate --- ionic liquids --- mercury ions --- chromium(VI) --- competitive adsorption --- voltammetry --- titanium --- liquid-liquid extraction --- WEEE --- value chain --- fayalite --- gold cyanidation --- reusability --- recovery --- platinum group metals --- refining --- tri-n-octylamine --- red mud --- electroleaching --- Alamine® 336 --- indium --- intensification behavior --- base metal production --- bauxite residue --- hydrometallurgy --- structure --- nickel iron oxide --- pregnant thiosulfate solutions --- resin adsorption technique --- ion exchange resin --- electrodeposition --- back-extraction --- eluent

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There are several major megatrends having an impact on pyrometallurgical metal processing. The steadily growing demand for all metals is strengthened by the emergence of electrical vehicles (EV), which brings a high need for battery metals, but additionally, a significant increase in copper consumption. Even if only moderate forecasts for the number of the EVs become true, production of the base metals must increase by tens of percentages, or even more than double. At the same time, pyrometallurgical processes have to produce fewer side products, such as slag, and maintain the quality level of the primary product, although raw material mixtures are increasingly complex and new elements are entering the processes in secondary raw materials. Therefore, it is imperative to continue the development of pyrometallurgical processes more efficiently and productively, while still improving their selectivity regarding slagging the unwanted material and recovering the desired elements. This Special Issue is for current advances in the pyrometallurgical processing of metals, including all aspects, namely, the basic unit processes and operations in a smelter, metallurgical engineering, furnace integrity, cooling systems, modelling, slag and offgas handling, to name a few. A collection of 13 papers deal with ferrous and ferroalloy development, and the processing of different raw materials for metal production.

Technology: general issues --- blast furnace slag --- TiO2 --- titanium carbonitride --- viscosity --- limonite --- magnetization reduction roasting --- rotary kiln --- deposit --- fayalite --- FeO --- liquid phase --- medium manganese steel --- spinel inclusions --- Ce treatment --- modification mechanism --- copper concentrate --- pyrometallurgy --- flash smelting --- combustion --- classification --- spectroscopy --- PCA --- SIMCA --- PLS-DA --- k-NN --- support vector machines --- scandium --- master alloys --- aluminum alloys --- metallothermy --- vacuum induction melting --- factsage --- nickel laterite --- non-melting reducing --- sodium chloride --- magnetic separation --- garnierite --- vacuum carbothermal reduction --- mechanism --- CaF2 --- recovery --- devolatilization --- torrefied biomass --- bio-coal --- volatile matter --- reduction --- blast furnace --- multistage and deep reduction --- low-oxygen high titanium ferroalloy --- inclusions --- melt separation --- slag-metal separation --- hearth drainage --- iron and slag flow --- interface phenomena --- CaO-SiO2-FetO-P2O5 slag system --- distribution ratio of phosphorus --- dephosphorization --- n·2CaO·SiO2-3CaO·P2O5 solid solution --- B2O3 --- vanadium–titanium sintering --- metallurgical properties --- microstructures --- Søderberg electrodes --- submerged arc furnace (SAF) --- ferro-alloy production --- ferrochrome --- electrical resistivity --- degree of graphitisation --- bulk density --- porosity --- compressive breaking strength

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Steel is a critical material in our societies and will remain an important one for a long time into the future. In the last two decades, the world steel industry has gone through drastic changes and this is predicted to continue in the future. The Asian countries (e.g. China, India) have been dominant in the production of steel creating global over-capacity, while the steel industry in the developed countries have made tremendous efforts to reinforce its global leadership in process technology and product development, and remain sustainable and competitive. The global steel industry is also facing various grand challenges in strict environmental regulation, new energy and materials sources, and ever-increasing customer requirements for high quality steel products, which has been addressed accordingly by the global iron and steel community. This Special Issue, “Ironmaking and Steelmaking”, released by the journal Metals, published 33 high quality articles from the international iron and steel community, covering the state-of-the-art of the ironmaking and steelmaking processes. This includes fundamental understanding, experimental investigation, pilot plant trials, industrial applications and big data utilization in the improvement and optimization of existing processes, and research and development in transformative technologies. It is hoped that the creation of this special issue as a scientific platform will help drive the iron and steel community to build a sustainable steel industry.

artificial neural network --- n/a --- corrosion --- inclusion control --- steel-making --- simulation --- liquid steel --- phosphate capacity --- slag --- hydrogen --- TG analysis --- surface roughness --- iron sulfate --- shot peening --- refining kinetics --- iso-conversional method --- oxygen blast furnace --- Barkhausen noise --- gas flow rate --- ductile cast iron --- toughness --- self-reduction briquette --- Mg deoxidation --- phosphorus distribution ratio --- iron oxides --- phase analysis --- desiliconisation --- solid flow --- CaO/Al2O3 ratio --- surface depression --- carbothermal reduction --- rotary hearth furnace --- torrefied biomass --- hot metal pre-treatment --- inclusions --- microwaves --- ironmaking --- reactivity --- CaO–based slags --- high-aluminum iron ore --- oxides --- HPSR --- internal crack --- fluorapatite --- crystallization rate --- COREX --- liquid area --- Al addition --- Wilcox–Swailes coefficient --- plasma arc --- evaluation of coupling relationship --- penetration theory --- silicate crystals --- ionization degree --- pellet size --- prediction model --- continuous casting --- direct element method --- modified NPL model --- slag film --- volatile matter --- crystallite size --- Al-TRIP steel --- viscosity --- anosovite crystals --- slag formation --- CO2 emissions --- integrated steel plant --- flow pattern --- high-heat-input welding --- dephosphorisation --- copper stave --- direct reduction --- shrinkage --- Cr recovery --- chemical composition --- high speed steel --- material flow --- 33MnCrTiB --- gas-based reduction --- converter --- bio-coal --- flat steel --- sulfur distribution ratio --- cold experiment --- secondary refining process --- re-oxidation --- vaporization dephosphorization --- sulfide capacity --- electroslag cladding --- hydrogen attack --- oxygen steelmaking --- non-metallic inclusions --- cracks --- non-contact measurement --- energy consumption --- high-manganese iron ore --- non-metallic inclusion --- Ca deoxidation --- Ca-treatment --- compressive strength (CS) --- oil-pipeline steel --- thermal treatment --- carbon monoxide --- composite roll --- crystallization behaviors --- devolatilization --- carbon-saturated iron --- steelmaking factory --- slag crust --- combustion --- high heat input welding --- ore-carbon briquette --- activation energy --- flow velocity --- kinetics --- hydrogen plasma --- casting speed --- solid and gaseous oxygen --- hercynite --- low fluorine --- iron ore pellets --- fayalite --- heat-affected zone --- CO–CO2 atmosphere --- and nitrogen --- smelting reduction --- high-phosphorus iron ore --- iron oxide --- mold flux --- BaO --- intragranular acicular ferrite --- carbon composite pellet --- electrolytic extraction --- iron ore --- carbon dioxide --- agglomerate --- vanadium titano-magnetite --- emission spectrum --- static process model --- concentrate --- structure --- titanium slag --- bonding interface --- fork --- blast furnace --- reaction mechanism --- reduction --- synergistic reduction --- injection --- principal component analysis --- ultrafine particles exposure --- CaO-based slags --- Wilcox-Swailes coefficient --- CO-CO2 atmosphere