En este estudio, se presentan los resultados del efecto de la aplicación tratamientos térmicos solubilizado (TTS) sobre un acero grado comercial con diferentes contenidos niobio (Nb) como elemento aleación (0.059, 0.084 y 0.146 %). El empleo porcentajes varaibles Nb, permitió evaluar además, el precipitación su distribución en microestructura, por ende, variación propiedad dureza microdureza, antes después TTS. Las temperaturas TTS oscilaron entre 850-1150 °C tiempos permanencia 1 a 8 h,...

Las ferritas son materiales con múltiples aplicaciones gracias a sus propiedades magnéticas únicas. Para esta investigación se sintetizaron partículas de magnetita (Fe3O4) por coprecipitación química variando la temperatura del medio. A partir magnetita, sintetizó maghemita (Fe2O3), aplicando un tratamiento térmico. Se utilizaron y junto óxido zinc (ZnO) grado reactivo como precursores para síntesis ferrita (ZnFe2O4) técnica molienda mecánica, durante variaron velocidad composición los...

In this study, the effect of martensite volume fraction on mechanical, tribological, and corrosion properties API 5CT dual-phase steel is studied based intercritical heat treatment routes at different temperatures (730, 760, 790 °C). Hardness specimens increased by increasing up to 50%. Further increase in led an wear resistance. Sliding pin-on-disk tests were analyzed following ASTM G99 standard, obtaining rate, lost mass, Archard coefficient as a function time temperature treatment. A...

Abstract Sulfide minerals are one of the most important sources metal values. On other hand, some sulfides such as pyrite considered major impurities in solid fossil fuels coal. Oxidation these has been route to obtain base metals and remove sulfur by leaching. This work summarizes results obtained regarding use ozone oxidation sulfide ores containing gold, silver, copper. Results show that extraction gold silver is increased at least 15%, with lower cyanide consumption; copper 16% less...

The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted atmospheric-pressure low-pressure reactors, respectively. Leaching precipitation iron was achieved same stage using different reagents like Fe3+, O2, O3, Fe2+ (which is continuously oxidized solution by H2O2 O2). highest percentage extraction (96%) obtained H2SO4, Fe2+, O2. Experimental results compared with those other researchers to provide...

Jarosites are residues generated during the purification of zinc and composed mainly iron sulfates ((Na, K)Fe3(SO4)2(OH)6). Due to large volume jarosite process, these tend be deposited in land areas not used. In present work, was used without heat treatment (JST) as an adsorbent hexavalent chromium contained a sample wastewater from chrome plating industry under following conditions: C0 = 200 mg/L Cr, T 25 °C, pH 3. It only possible remove 34% Cr (VI). Subsequently, thermal (JTT) carried...

Slags, sludges, and dust from steelmaking industries have been probed as adsorbents for Pb(II) removal synthetic water solutions, these residues showed good potential in the treatment of industrial effluents contaminated with this heavy metal. Adsorption precipitation postulated main mechanisms to remove aqueous solutions by using residues. The significant effect pH on has well studied but few studies explicitly address chemical mineralogical composition a better understanding key parameter...

The removal of pyritic sulfur from a Mexican sub-bituminous coal in nitric, sulfuric, and hydrochloric acid solutions was investigated. effect the type concentration acid, presence hydrogen peroxide ozone as oxidants, temperature range 20−60 °C, studied. relevant factors pyrite dissolution were determined by means statistical analysis variance optimized response surface method. Kinetic models also evaluated, showing that follows kinetic model shrinking core model, with diffusion through...

Several attempts have been made to optimize the process and reduce operating costs of acid leaching low grade sulphide copper ores. In this study, we conducted acidic low-grade chalcopyrite by using ferric ion ozone as oxidants, at 25°C. particular, used a Taguchi L9 experimental design (four factors, three levels) determine effects particle size, sulphuric concentrations ([Fe+3] [H2SO4]) (O3) mass flow rate, on amount extracted. Statistical analysis showed that [Fe+3] had greatest effect...

The sludge from a wet-off gas cleaning system of the iron blast furnace (BF) contains significant amounts iron; however, they cannot be recycled due to their high content zinc and alkalis. These compounds are detrimental optimal performance steelmaking furnaces. In this work, comparative laboratory study reduce alkali contained in (BFS) is presented. effect leaching parameters such as oxidant (i.e., ferric ion, oxygen or ozone), aqueous solution media 0.2 M NH4Cl, HCl 0.1 H2SO4) temperature...

Rare earth elements comprise a group of 17 chemically similar elements, which increases the difficulty separating them by traditional methods. For this reason, hydrometallurgy has been most used method. However, it is important to evaluate efficiency leaching processes because, in addition depending on operating parameters leaching, they also depend mineralogical composition sample. In present work, extraction Ce and La contained ferrocarbonatite mineral from north Mexico was studied. tests,...

The purpose of this work is to obtain the optimum conditions for leaching zinc contained in an industrial lead smelting slag. In type slag, oxide, sulfide, and ferrite are contained. Zinc extraction from these compounds consists using a single aqueous medium, where oxidant alkaline with NaOH NaClO was used. parameters evaluated during experiment were as follows: percentage solids, NaOH/NaClO ratio, temperature. maximum amount recovered Zn obtained 58%. This achieved by following optimal...

This research is mainly focused on the evaluation of TiO2/Fe2O3 composite and two industrial types waste (kaolin (Clay-K) a blast furnace sludge (BFS)) as adsorbent materials cyanide photocatalysts. First, adsorption tests were performed in absence light. During photodegradation experiments, effect type irradiation (ultraviolet (UV) light), visible light natural sunlight), time, photocatalyst, well irradiance case sunlight use, investigated. Adsorption results indicate that Clay-K adsorb...

The use of ozone for the oxidation cyanidation wastewater has been studied since 1950's. In last 2 decades, to oxidize sulfide ores studied. This report presents some results obtained concerning in raw containing gold and silver as well treatment tails or residues process. show that with prior may help optimize this process, mainly through reduction consumption cyanide.

In this work, blast furnace dust (BFD) obtained from a steel collector is used as low-cost adsorbent material for chromium removal industrial plating wastewater.This study shows that BFD present physical and chemical characteristics, such composition, magnetic properties particle size, suitable application in adsorption of ions chromium.Different kinetics approaches isotherms models were evaluated to describe the process.According results, follows intra-particle diffusion with active...

In this work, the removal of cyanide from aqueous solutions was accomplished by using synergetic effect activated carbon and an oxidizing agent. A basic-character coconut shell (CAC) used; experiments were conducted in a semi-batch reactor, at 25 °C, initial pH 11.5, with concentration up to 1200 mg/mL. particular, beneficial agent such as air, oxygen or ozone on CAC evaluated. At optimum operating conditions found study, mg/mL totally decomposed about 3 h, 1 g 2 mgO3/min. The experimental...

In this work, blast furnace (BF) residues were well characterized and then evaluated as an adsorbent material for arsenic removal from a mining-contaminated groundwater. The adsorption process was analysed using the theories of Freundlich Langmuir. BF found to be effective sorbent As (V) ions. modelling isotherms by empirical models shows that arsenate is fitted Langmuir model, suggesting monolayer onto adsorbents. Arsenate residue explained charge density surface affinity formation Fe (II)...

The recovery of valuable metals from jarosites is a topic great relevance regarding the implementation circular economy; however, these materials also contain such as arsenic and lead, which are harmful to health environment. Considering factors, it important monitor at each stage treatment used recover metals. In present work, behavior As Pb was assessed during pretreatment conducted on jarositic residue using direct zinc leaching (DLR), well in cyanide media with glycine. It found that...

Currently, with the rapid growth of population, demand for metals has increased, especially manufacture electronic devices such as cell phones, computer equipment, among others. Once these stop working, most are sent to landfills, which represents a danger since wastes contain and other materials that must be properly managed prevent them from having negative effect on environment human being. On hand, e-waste contains valuable copper, gold, silver, concentration in makes it cost-effective...

AbstractAbstractSeveral attempts have been made to optimize the process and reduce operating costs of acid leaching low grade sulphide copper ores. In this study, we conducted acidic low-grade chalcopyrite by using ferric ion ozone as oxidants, at 25°C. particular, used a Taguchi L9 experimental design (four factors, three levels) determine effects particle size, sulphuric concentrations ([Fe+3] [H2SO4]) (O3) mass flow rate, on amount extracted. Statistical analysis showed that [Fe+3] had...

This paper reports the effect of components a direct leaching residue (jarosite and elemental sulfur), on recovery valuable metals such as gold silver. Leaching media cyanide mixtures with glycine were used to recover silver from residue; however, low these was obtained. occurred due negative its which caused problems in extraction process encapsulation (due jarosite) formation thiocyanate re-precipitation sulfur). Various treatments prior tested, finding that when desulfurized...

Precious metals such as gold (Au) and silver (Ag) are essential to our modern society due their unique properties, high conductivity physical chemical resistance. They teofn concentrated in by-products during the extraction of base metals. In present work, a chalcopyrite leaching residue, constituted mainly elemental sulfur jarosites, was subjected different pretreatments leached with media recover Au Ag. The solid residue pretreated by...