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Extraction of Nb and Ta from a coltan ore from South Kivu in …
An alkaline roasting of a coltan bearing ore from the Numbi deposit (South Kivu, the DRC) was investigated with particular focus on the extraction kinetics of Ta and Nb. Isothermal roasting experiments were carried out to study the effects from KOH to ore mass ratio, particle size and roasting temperature on the degree of Ta and Nb ...
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Sequential removal of selenium and tellurium from
A process using soda roasting–alkaline leaching–acid leaching to remove selenium, tellurium and copper sequentially from the copper anode slime with high content of Ni was tested. The mechanism of this process was outlined based on thermodynamic analysis and the change in the XRD patterns of different intermediate …
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Materials | Free Full-Text | Effective Extraction of the Al
Secondary aluminum dross (SAD) is a hazardous solid waste discharged from aluminum electrolysis and processing and the secondary aluminum industries, which causes severe environmental pollution and public health disasters. The stable presence of the α-Al2O3 and MgAl2O4 phases in SAD makes it difficult for it to be efficiently utilized. …
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Selective recovery of Cr from stainless steel slag by alkaline …
Abstract Selective chromium (Cr) leaching from stainless steel slag (SS slag) by alkali roasting followed by water leaching was investigated. The efficiency of the …
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Development of vein graphite by optimizing the NaOH
Based on the outcome of this alkali roasting study, the optimum NaOH concentration for the alkali roasting process was selected. Then for the combined process, the alkali roasting was performed using the selected optimum NaOH concentration with 3.75 g of graphite powder, which had already been subjected for the acid leaching with 5 …
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Alkaline roasting of ilmenite
Roasting ilmenite concentrates with alkali metal carbonates and nitrates at 860°C produced a series of M Fe Ti oxide phases (M = Na or K) which were readily interconvertible on adding alkali or ilmenite, as appropriate, and reroasting at 860°C. Mixed Na K compounds were not observed. The M Ti ratio for maximum formation of each …
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UNITED STATES PATENT OFFICE
objective of an alkaline roast for the production of chronates, without fusion of any of the salts in the system producing sodium chromate, initial roasting temperatures not over about 850° C., and final temperatures not over about 800° C. will be required. Similar, but of course, not identical figures Will pertain to other salts such as
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Study on the Mechanisms for Vanadium Phases
The most common industrial practice to recover vanadium from vanadium slag is by alkaline salt roasting followed by water leaching . In this process, vanadium …
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Efficient Extraction of Ta and Nb from a Coltan Ore Through …
The optimal roasting conditions determined as temperature (450 °C), roasting time (2 h), molar ratio KOH/(Ta,Nb) 2 O 5 of 13.2 (e.g., mass ratio KOH to ore of about 2/1) and granulometric fraction (− 105 + 75 µm), enabled about 87% of Ta and 92% of Nb to be subsequently water leached. The resulting alkaline pregnant leach solution
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Extraction of Copper and Nickel from Low-Grade Nickel
Low-temperature roasting, selective decomposition and water-leaching were used to extract nickel and copper from low-grade nickel sulfide ore with highly alkaline gangue. The effects of variable factors, such as the dosage of roasting additives, the ore particle size, roasting time and roasting temperature, selective decomposition …
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Optimization and dissolution kinetics of vanadium recovery
Alkaline roasting-alkaline leaching process was used to recover vanadium from LD (Linz Donawitz) converter slag. The independent leaching parameters investigated were liquid to solid ratio (L/S) (10–20 mL/g), temperature (40–60°C), NaOH concentration (1.0–3.0 M), and time (60–120 minutes). Response surface methodology (RSM) was …
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Microwave assisted alkaline roasting-water leaching for the
Microwave alkaline roasting-water leaching Franklinite decomposition 1. Introduction A considerable economic and environmental issue for the metallurgical …
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A cleaner vanadium extraction method featuring non-salt roasting …
However, in the alkaline-roasting process, sodium salts produce chlorine, hydrogen chloride, sulfur dioxide and sulfur trioxide, ... (Basu and Taniguchi, 1984, Li et al., 2015), and may also form vanadate crust, affecting the reaction of O 2 and vanadium spinel. The oxidation of vanadium compounds at temperatures from 800 to 1,000 °C mentioned ...
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Alkaline roasting of ilmenite
Abstract Roasting ilmenite concentrates with alkali metal carbonates and nitrates at 860°C produced a series of M Fe Ti oxide phases (M = Na or K) which were …
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(PDF) Recovery of Cerium Oxide Abrasive from an …
The experimental results indicated that the polished glass in the abrasive–glass polishing waste could be fully removed under the optimal alkaline roasting and water leaching conditions of ...
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Comparative study of alkali roasting and leaching of
A first set of alkali roasting experiments was carried out using NaOH and KOH, in which the roasting temperatures 400 °C, 700 °C and 1000 °C were investigated. A summary of these experiments is presented in Table 2. All chromite roasted samples …
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Recovery of nickel and molybdate from ammoniacal leach
At the same time, it is a valuable raw material due to the presence of metals like molybdenum, nickel, cobalt, vanadium etc. Various processes such as (i) oxidative roast- alkali leaching (Villarreal et al., 1999), (ii) Oxidative roast- ammonia leaching (Hubred et al., 1984; Marcantonio, 1991), (iii) oxidative roast- acid leaching (Inoue et al ...
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ORBi: Detailled Reference
[en] An alkaline roasting of a coltan bearing ore from the Numbi deposit (South Kivu, the DRC) was investigated with particular focus on the extraction kinetics of Ta and Nb. Isothermal roasting experiments were carried out to study the effects from KOH to ore mass ratio, particle size and roasting temperature on the degree of Ta and Nb …
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Crosslinking of starch by alkaline roasting
Abstract Dry mixtures of starch with various bases were roasted in air. The effects of roasting were determined by a viscosity method. The results suggest that roasting at …
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Recovery of chromium by calcium-roasting, sodium-roasting, …
After calcium-roasting, acidic leaching or alkaline leaching was followed to leach out high valence chromium, Cr 2 O 7 2− or CrO 4 2− (Cai et al. 2016; Li et al. 2020a, 2012; Wen et al. 2020, 2018b, 2019c).. To improve the leaching efficiency of chromium, the reaction mechanism during the calcification roasting process had attracted much more …
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Minerals | Free Full-Text | The Effect of Alkali Roasting
The roasted ore was then cooled down and transferred to the extraction step. In the alkali roasting route, 60% w/w of alkali (Na 2 CO 3, Na 2 SO 4, NaOH) was mixed with 6 g limonite nickel ore; the blend was then roasted under conditions identical to the conventional roasting route. After cooling, the alkali-roasted ore was then washed with ...
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Recovery of vanadium from spent catalysts and alumina residues …
It is shown that quaternary amines offer the greatest flexibility for treating acidic, neutral, or alkaline liquors depending on the process of choice. Keywords. Tertiary Amine; Spend …
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Migration behavior of impurities during the purification of waste
The removal of impurities mainly follows three routes: (1) V-, P-, and S-bearing impurities were complete removed (some formed soluble salts during alkaline roasting, and the remainder was dissolved in acid); (2) most Al-, K-, and Si-bearing impurities were removed by alkaline roasting, with the remainder was dissolved in the acid-leaching ...
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Evaluation of Variables Determining Leaching Efficiency in
Effect of Na 2 CO 3 Addition on Leaching Efficiency in Alkali-Roasting Process. Figure 3 shows the effect of Na 2 CO 3 addition on the leaching efficiencies for vanadium, sodium, silicon, and aluminum. The leaching efficiencies for titanium and iron were also analyzed, but the results were less than 0.05 pct. According to a previous …
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A novel method to extract vanadium from high-grade …
Keywords: high-grade vanadium slag; cleaner production; non-salt roasting; alkaline leaching; mechanisms 1. Introduction Vanadium is a high melting point metal and is widely used in metallurgical industries due to its ability to enhance the mechanical properties such as tensile strength, hardness, and fatigue resistance
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Extraction of Nb and Ta from a coltan ore from South
An alkaline roasting of a coltan bearing ore from the Numbi deposit (South Kivu, the DRC) was investigated with particular focus on the extraction kinetics of Ta and Nb. Isothermal roasting ...
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Abrasive–Glass Polishing Waste through Alkaline Roasting …
considered that by alkaline roasting using an alkaline chemical such as NaOH, the polished glass in the abrasive–glass polishing waste can be transferred to a water soluble compound of sodium silicate (Na2SiO3), which can be dissolved and removed by subsequent water leaching treatment; thus, the cerium oxide abrasive of high purity can …
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(PDF) Effective Extraction of the Al Element from
alkaline roasting is developed, as shown in Figure 1. The proposed process aims at. economically achieving high Al recovery. Materials 2022, 15, 5686 3 of 16. M a t eri a l s 2 0 2 2, 15, x F O R ...
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(PDF) Comparative study of alkali roasting and leaching of …
Sanchez-Segado et al. (2015a) further studied alkali roasting of Boma r il meni te with sodi um, p ota ssi um and lithi um carbo na tes and hydr oxi d es, fol low ed by acid leac hin g in orde r ...
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Alkaline Roasting Approach to Reclaiming Lithium and Graphite …
A green and economic approach was proposed to achieve closed-loop recycling of lithium and graphite by alkaline roasting from spent LIBs. Alkaline Roasting Approach to …
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