sodium sulfate magnetic separation

2.2 Methods. The test process was comprised of mixing, pressing, drying, pre-oxidation, reduction, ball milling, and magnetic separation. Firstly, the pyrite cinder mixture and sodium sulfate solution were mixed and compacted into briquettes (Φ10 × 15 mm) with pressure of 10 MPa.Then, the briquettes were dried in the oven at 105 °C for 4 h.

In the present study, grinding and wet magnetic separation of the products from semi-molten state reduction of Panzhihua ilmenite concentrate was investigated. The separation aimed at producing a titania-rich slag and a metal phase containing most of iron. ... The addition of sodium carbonate and sodium sulfate effectively improves the ...

Iron, chromium, and sodium were simultaneously removed from the extracted vanadium tailings using a calcium reduction roasting and magnetic separation process. A schematic diagram of calcium reduction-magnetic separation process is shown in Fig. 2. First, the samples were dried in an oven at 105 ℃ for 4 h, weighed, and then placed in a ...

Fused sodium sulfate utilized for electrochemical polarization of the platinum electrode further recovered dysprosium and neodymium metals: Fukumoto et al. (2012) ... The present review article on solvent extraction of dysprosium and neodymium and their possible separation from permanent magnet scrap outlines various advances made in …

It has been demonstrated that the addition of sodium sulphate during the reductive roasting of laterite ore can enhance the subsequent grinding-magnetic separation efficiencies, the grade of ...

selective reduction with addition of sodium sulfate (10.0 mass%) at 1 200°C for 50 min. A ferronickel concentrate with Ni grade of 9.9 mass% and nickel recovery of 90.9% was obtained after wet magnetic separation. Lu 14) et al. studied the effect of sodium sulfate on the hydrogen reduc-tion process of nickel laterite ore. The maximum nickel

In this work, the selective reduction of lateritic nickel ore was carried out using sodium sulfate, sodium carbonate, and sodium chloride as additives. The 5 wt% of anthracite coal, which contains 60.35% of fixed carbon and 1.9% of sulfur, was used as a reductant. All raw materials were mixed homogenously prior to the pelletization process …

The effect of sodium sulfate on the red mud separation roasting-magnetic separation process was studied. The results show that at the roasting temperature of 1100°C for 65 min, the segregation ...

ABSTRACT The selective reduction of nickel and adequate growth of ferronickel grains are imperative for efficient preparation of ferronickel from nickeliferous laterite ore via the process of direct reduction followed by magnetic separation. In Part I, reduction/sulfidation behaviors of a saprolitic laterite ore in the presence of sodium …

The results show that after reduction roasting–magnetic separation with sodium sulfate dosage of 2 wt% at roasting temperature of 1150 °C for roasting time of 120 min, metallic iron...

A high nickel grade ferronickel was produced from laterite ore using the selective reduction-wet magnetic separation process, with the addition of sodium sulfate (Na 2 SO 4).The ferronickel concentrate assaying 9.87% Ni, with a nickel recovery of 90.90% can be obtained, when laterite ore was reduced at 1200 °C for 50 min with the …

The selective reduction process is the process to separate nickel and iron on limonite with the combination of magnetic separation. This process uses sodium sulphate as the additive and graphite as the reductant. The stoichiometry of reductant and the concentration of additive are the key for this process on the selective reduction to the …

The carburization roasting treatment followed by the magnetic separation is an effective way to utilize low-grade siderite, in which the sodium sulfate additive plays an important role.

The inconsistent changes between Fe metallization ratio and its recovery as sodium sulfate dosage varies from 0% to 5%, shows that the magnetic separation of ferronickel from gangue is more effective in the presence of sodium sulfate. The different magnetic separation efficiency of reduced laterite pellets in the absence or presence of …

The nonmagnetic FeS generated in the process reported to the tailings during the magnetic separation process, resulting in the reduced iron content and recovery . In addition, sodium sulfate reacts with forsterite from lizardite decomposition and generates more complex crystalline phases which decrease the content and recovery of …

A polyelectrolyte, dextran sulfate sodium (DSS) salt was used as an additive to reduce phase separation by encapsulating small SS particles. These suspended SS particles enclosed inside of the DS polyanions, due to strong electrostatic interactions, significantly reduce the precipitation/settling rate of SS particles during melting.

The another view hold that sodium sulfate can form eutectic compound sulfate (Na 2 Me(SO 4) 2) react with the preformed metal sulfate (such as nickel sulfate, copper sulfate, and cobalt sulfate ...

Abstract Red mud has become one kind of the most hazardous solid waste. In order to recover iron from red mud, the technology of sodium salt roasting and magnetic separation was developed. During the reduction roasting, additives (Na2SO4 and CaO) reacted with SiO2 and Al2O3 of red mud, forming NaO⋅Al2O3⋅2SiO2, 2CaO⋅Al2O3⋅SiO2, …

The results show that after reduction roasting–magnetic separation with sodium sulfate dosage of 2 wt% at roasting temperature of 1150 °C for roasting time of 120 min, metallic iron concentrate ...

ABSTRACT In Part II, the correlation between Fe–Ni grain growth and characteristic fusion temperatures of the Na2SO4–laterite mixtures, and phase transformations of the reduced pellets were investigated. For the mechanism of sodium sulphate, Na+ is able to liberate the hosted nickel and iron within lizardite, while SO42– …

Particles with a diameter larger than 1 μm can be separated easily using simple magnetic separators, while separation of smaller particles (magnetic colloids …

Compared with those reduced without sodium sulfate, the Ni grade of ferronickel concentrate increased from 2.33% to 9.48%, and the magnetic separation recovery of Ni increased from 56.97% to 83.01 ...

However, with addition of 8.0 mass% sodium sulfate, the grade of Ni in magnetic material and the recovery of Ni reached up to 9.7 mass% and 89.1%, respectively. ... After magnetic separation, the ...

The results show that after reduction roasting–magnetic separation with sodium sul-fate dosage of 2 wt% at roasting temperature of 1150 C for roasting time of 120 min, metallic …

Magnetic separation of nucleic acids has several advantages compared to other techniques used for the same purpose. Nucleic acids can be isolated directly from crude sample materials such as blood, tissue homogenates, cultivation media, water, etc. ... The use of sodium perchlorate in deproteinization during the preparation of nucleic acids ...

Na 2 O improves nickel recovery, whereas S and Na 2 S are beneficial for nickel enrichment through magnetic separation because of the formation of FeS. Thus, …

The commonly reported procedure includes crushing and physical magnetic separation. Paper and plastic particles have been separated using appropriate sieves. The BM of lithium batteries can be used as a secondary source of cobalt, lithium and nickel. ... Sodium sulfate, Na 2 SO 4, Chempur, CAS : 142.04: 99.0: Sodium …

Reductive roasting of nickel laterite ore with sodium sulfate for Fe-Ni production. Part I: Reduction/sulfidation characteristics. Mingjun Rao School of Minerals Processing and Bioengineering, ... efficient preparation of ferronickel from nickeliferous laterite ore via the process of direct reduction followed by magnetic …

Compared with those reduced without sodium sulfate, the Ni grade of ferronickel concentrate increased from 2.33% to 9.48%, and the magnetic separation recovery of Ni increased from 56.97% to 83.01 ...

The dual effect of sodium-salt-assisted reductive roasting for iron recovery and chromium enrichment from lateritic iron ore was investigated. Iron oxides were reduced to metallic iron through reductive roasting, while Al- and Si-bearing components were transformed to sodium aluminosilicate and/or diaoyudaoite. Thus, direct reduced iron …

To increase the efficiency of magnetic separation, a large particle size of ferronickel is desired. Therefore, in this study, the influences of CaO, CaF2, and H3BO3 additives on the evolution of ferronickel particle at ≤1250°C were investigated. ... J. Kou, N. Liu, and S.Y. Zhang, Mechanism of sodium sulfate in promoting selective reduction ...

The increased iron recovery and TFe in the concentrate after magnetic separation was mainly attributed to the formation of magnetite Fe3O4 on the surface of iron-bearing minerals during surface magnetization. ... The addition of sodium sulfate and calcium oxide during reductive roasting increased the iron recovery efficiency up to …

The effect of sodium sulfate on the red mud separation roasting-magnetic separation process was studied. The results show that at the roasting temperature of …

In the condition of sodium sulfate content of 2 wt%, reduction time of 120 min, ore reduction mill to a particle size of <0.074 mm accounting for 95 wt% and the strength of magnetic separation of 0.08 T, the effect of roasting time on the separation and recovery of iron and titanium in … See more

Reduction roasting with sodium sulfate followed by magnetic separation was investigated to utilize vanadium tailings with total iron grade of 54.90 wt% and TiO 2 content of 17.40 wt%. The results show that after reduction roasting–magnetic separation with sodium sulfate dosage of 2 wt% at roasting temperature of 1150 °C for roasting time of 120 min, …

The process of reductive roasting followed by magnetic separation was adopted in this article, and sodium sulfate was employed to enhance reductive roasting and magnetic separation. It is aimed to enrich rare earth and niobium in the nonmagnetic fraction and prepare metallic iron in the magnetic fraction for steel making.