scholarly journals Extraction of Nickel from Garnierite Laterite Ore Using Roasting and Magnetic Separation with Calcium Chloride and Iron Concentrate

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 352 ◽  
Author(s):  
Junhui Xiao ◽  
Wei Ding ◽  
Yang Peng ◽  
Tao Chen ◽  
Kai Zou ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Calcium Chloride ◽  
Magnetic Field Intensity ◽  
Mineral Phase ◽  
Iron Mineral ◽  
Nickel Recovery ◽  
Iron Concentrate ◽  
Iron Phase ◽  
Roasting Temperature ◽  
Laterite Ore

In this study, segregation roasting and magnetic separation are used to extract nickel from a garnierite laterite ore. The garnierite laterite ore containing 0.72% Ni, 0.029% Co, 8.65% Fe, 29.66% MgO, and 37.86% SiO2 was collected in the Mojiang area of China. Garnierite was the Ni-bearing mineral; the other main minerals were potash feldspar, forsterite, tremolite, halloysite, quartz, and kaolinite in the garnierite laterite ore. The iron phase transformations show that nickel is transformed from (Ni,Mg)O·SiO2·nH2O to a new nickel mineral phase dominated by [Ni]Fe solid solution; and iron changed from Fe2O3 and FeOOH to a new iron mineral phase dominated by metal Fe and Fe3O4 after segregation roasting. Ferronickel concentrate with Ni of 16.16%, Fe of 73.67%, and nickel recovery of 90.33% was obtained under the comprehensive conditions used: A roasting temperature of 1100 °C, a roasting time of 90 min, a calcium chloride dosage of 15%, an iron concentrate dosage of 30%, a coke dosage of 15%, a coke size of −1 + 0.5 mm, a magnetic separation grinding fineness of <45 μm occupying 90%, and a magnetic separation magnetic field intensity of H = 0.10 T. The main minerals in ferronickel concentrate are Fe, [Ni]Fe, Fe3O4, and a small amount of gangue minerals, such as CaO·SiO2 and CaO·Al2O3·SiO2.

Recovery a Refractory Oolitic Hematite by Magnetization Roasting and Magnetic Separation

2011 ◽  
Vol 361-363 ◽  
pp. 305-310 ◽  
Author(s):  
Chao Guo ◽  
Hui Wang ◽  
Jian Gang Fu ◽  
Kai Da Chen
Keyword(s):  
Magnetic Field ◽  
Magnetic Separation ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Reducing Agent ◽  
Iron Concentrate ◽  
Roasting Temperature ◽  
Iron Grade ◽  
Temperature Time ◽  
Iron Ore Concentrate

Orthogonal test was carried out to investigate effects of multiple factors during the magnetization roasting-magnetic separation process as follow: roasting temperature, time, ratio of reducing agent and magnetic field intensity. Significant order of those factors on grade of iron concentrate is obtained, and opportune condition for magnetic roasting is determined. As the condition that roasting temperature is 850°C, time is 40min, ratio of reducing agent is mcoal/more=12% and magnetic field intensity is 1800Gs, iron ore concentrate whose grade and recovery are 56.32% and 94.03%, respectively, is obtained. At last, through closed-circuit test including magnetization roasting, magnetic separation and reverse flotation, final result is obtained that iron concentrate with phosphorus and silicon are 0.18% and 2.63%, respectively, and its iron grade and recovery are 60.47% and 80.1%, respectively.

scholarly journals Recovery of γ-Fe2O3 from copper ore tailings by magnetization roasting and magnetic separation

2021 ◽  
Vol 19 (1) ◽  
pp. 128-137
Author(s):  
Bing Luo ◽  
Tongjiang Peng ◽  
Hongjuan Sun
Keyword(s):  
Magnetic Separation ◽  
Magnetic Field Intensity ◽  
Sodium Dodecyl ◽  
Separation Process ◽  
Sodium Dodecyl Sulfonate ◽  
Copper Ore ◽  
Yield Rate ◽  
Optimum Parameters ◽  
Roasting Temperature ◽  
Mineralogical Phase

Abstract To comprehensively reuse copper ore tailings, the recovery of γ-Fe2O3 from magnetic roasted slag after sulfur release from copper ore tailings followed by magnetic separation is performed. In this work, after analysis of chemical composition and mineralogical phase composition, the effects of parameters in both magnetization roasting and magnetic separation process with respect to roasting temperature, residence time, airflow, particle size distribution, magnetic field intensity, and the ratio of sodium dodecyl sulfonate to roasted slag were investigated. Under optimum parameters, a great number of γ-Fe2O3 is recycled with a grade of 66.86% and a yield rate of 67.21%. Meanwhile, the microstructure, phase transformation and magnetic property of copper ore tailings, roasted slag, and magnetic concentrate are carried out.

Experimental Study on Recovery of Nickel from Nickel-Bearing Laterite

2014 ◽  
Vol 881-883 ◽  
pp. 1611-1615
Author(s):  
Xian Hai Li ◽  
Bi Yang Tuo ◽  
Qin Zhang ◽  
Shen Jun Zhang
Keyword(s):  
Nickel Oxide ◽  
Magnetic Separation ◽  
Reduction Temperature ◽  
Experimental Conditions ◽  
Nickel Recovery ◽  
Technology Process ◽  
Research Findings ◽  
Simple Technology ◽  
Effective Result ◽  
Laterite Ore

It is known that to extract nickel from nickel-bearing laterite ore is not an easy job. By reducing roast-magnetic separation, an effective result is achieved in this research in dealing with nickel-bearing laterite ore due to its simple technology process and the high nickel recovery. Nickel-bearing laterite studied in this research is mainly characterized by fine disseminated grain size and easy argillation. Thus, valuable mineral (i.e. nickel oxide) can not be effectively separated from the nickel-bearing laterite ore simply by regular mineral processing technology. To solve the problem, both reducing roast and wet magnetic separation are adopted in the study with the purpose of making up the lack of dynamics so as to reduce the reduction temperature of nickel laterite. Flux catalyst is added to strengthen the reducing reaction of nickel oxide and iron oxide. The optimistic experimental conditions are determined as following: the consumption of the flux catalyst agent and the reducing agent are 5% and 4% (by weight) respectively, the reduction temperature remains at 1200°C, the reduction time is 2h, and the appropriate magnetic field intensity is 240 RA/m. The research findings show that the nickel grade of the concentrate increases from 1.58% to 5.49%, with its recovery reaching above 80 %.

Beneficiation of Iron with Magnetic Separators

2014 ◽  
Vol 978 ◽  
pp. 44-47
Author(s):  
Kai Hou ◽  
Xiong Tong ◽  
Xian Xie ◽  
Bo Yang
Keyword(s):  
Magnetic Separation ◽  
Iron Mineral ◽  
Iron Concentrate ◽  
Separation Results

Research on beneficiation of iron from iron-polymetallic was conducted according to the properties of the ore. The separation results show that magnetic separation is the best way to concentrate the iron mineral. The results show that iron concentrate assaying 60.15% Fe can be obtained with the recovery of 76.48%.

scholarly journals Extraction of Cobalt and Iron from Refractory Co-Bearing Sulfur Concentrate

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 200 ◽  
Author(s):  
Junhui Xiao ◽  
Yushu Zhang
Keyword(s):  
Solid Solution ◽  
Iron Content ◽  
Cobalt Content ◽  
Iron Recovery ◽  
Mineral Phase ◽  
Iron Mineral ◽  
Iron Concentrate ◽  
Cobalt Recovery ◽  
Panxi Area ◽  
Iron Grade

In this study, oxidizing roasting, segregation roasting, and magnetic separation are used to extract cobalt and iron from refractory Co-bearing sulfur concentrate. The Co-bearing sulfur concentrate containing 0.68% Co, 33.26% Fe, and 36.58% S was obtained from V-Ti magnetite in the Panxi area of China by flotation. Cobalt pyrite and linneite were the Co-bearing minerals, and the gangue minerals were mica, chlorite, feldspar, and calcite in Co-bearing sulfur concentrate. The results show that cobalt is transformed from Co-pyrite and linneite to a Co2FeO4-dominated new cobalt mineral phase, and iron is transformed from pyrite to Fe2O3 and an Fe3O4-dominated new iron mineral phase after oxidizing roasting. Cobalt changed from CoFe2O4 to a new cobalt mineral phase dominated by [Co] Fe solid solution, and iron changed from Fe2O3 to a new iron mineral phase dominated by metal Fe and Fe3O4 after segregation roasting. Cobalt concentrate with a cobalt grade of 15.15%, iron content of 71.22%, and cobalt recovery of 90.81% as well as iron concentrate with iron grade of 60.06%, cobalt content of 0.11%, and iron recovery of 76.23% are obtained. The main minerals in the cobalt concentrate are Fe, [Co]Fe, Fe3O4, and SiO2, and the main minerals in the iron concentrate are Fe3O4, FeO, Ca2Si2O4, and Ca2Al2O4.

scholarly journals Production of Ferronickel Concentrate from Low-Grade Nickel Laterite Ore by Non-Melting Reduction Magnetic Separation Process

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1340
Author(s):  
Guorui Qu ◽  
Shiwei Zhou ◽  
Huiyao Wang ◽  
Bo Li ◽  
Yonggang Wei
Keyword(s):  
Magnetic Separation ◽  
Separation Process ◽  
Phase Changes ◽  
Low Grade ◽  
Nickel Laterite ◽  
Nickel Laterite Ore ◽  
Roasting Temperature ◽  
Grinding Time ◽  
Optimal Reduction ◽  
Laterite Ore

The production of ferronickel concentrate from low-grade nickel laterite ore containing 1.31% nickel (Ni) was studied by the non-melting reduction magnetic separation process. The sodium chloride was used as additive and coal as a reductant. The effects of roasting temperature, roasting duration, reductant dosage, additive dosage, and grinding time on the grade and recovery were investigated. The optimal reduction conditions are a roasting temperature of 1250 °C, roasting duration of 80 min, reductant dosage of 10%, additive dosage of 5%, and a grinding time of 12 min. The grades of nickel and iron are improved from 2.13% and 51.12% to 8.15% and 64.28%, and the recovery of nickel is improved from 75.40% to 97.76%. The research results show that the additive in favor of the phase changes from lizardite phase to forsterite phase. The additive promotes agglomeration and separation of nickel and iron.

scholarly journals Extraction of Manganese and Iron from a Refractory Coarse Manganese Concentrate

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 563
Author(s):  
Junhui Xiao ◽  
Kai Zou ◽  
Tao Chen ◽  
Wenliang Xiong ◽  
Bing Deng
Keyword(s):  
Magnetic Field ◽  
Magnetic Separation ◽  
High Intensity ◽  
Magnetic Field Intensity ◽  
Test Results ◽  
Calcium Hypochlorite ◽  
Iron Concentrate ◽  
Low Intensity ◽  
Manganese Concentrate ◽  
Intensity Magnetic Field

In this research, the coarse manganese concentrate was collected from a manganese ore concentrator in Tongren of China, and the contents of manganese and iron in coarse manganese concentrate were 28.63% and 18.65%, respectively. The majority of the minerals in coarse manganese concentrate occur in rhodochrosite, limonite, quartz, olivine, etc. Calcium chloride, calcium hypochlorite, coke, and coarse manganese concentrate were placed in a roasting furnace to conduct segregation roasting, which resulted in a partial chlorination reaction of iron to produce FeCl3, ferric chloride reduced to metallic iron and adsorbed onto the coke, and rhodochrosite broken down into manganese oxide. Iron was extracted from the roasted ore using low-intensity magnetic separation, and manganese was further extracted from the low-intensity magnetic separation tailings by high-intensity magnetic separation. The test results showed that iron concentrate with an iron grade of 78.63% and iron recovery of 83.60%, and manganese concentrate with a manganese grade of 54.04% and manganese recovery of 94.82% were obtained under the following optimal conditions: roasting temperature of 1273 K, roasting time of 60 min, calcium chloride dosage of 10%, calcium hypochlorite dosage of 5%, coke dosage of 10%, coke size of −1 mm, grinding fineness of −0.06 mm occupying 90%, low-intensity magnetic field intensity of 0.14 T, and high-intensity magnetic field intensity of 0.65 T. Most minerals in the iron concentrate were Fe, Fe3O4, and a small amount of SiO2 and CaSiO3; the main minerals in the manganese were MnO, and a small amount of Fe3O4, SiO2, and CaSiO3. The thermodynamic calculation results are in good agreement with the test results.

Study on Separation of Niobium and Iron from Low Grade Niobium Ore

2012 ◽  
Vol 524-527 ◽  
pp. 2044-2048 ◽  
Author(s):  
Bo Zhang ◽  
Mao Fa Jiang
Keyword(s):  
Magnetic Separation ◽  
Yield Ratio ◽  
Low Grade ◽  
Mineral Phase ◽  
Separation Effect ◽  
Technology Process ◽  
Roasting Temperature ◽  
Reductive Roasting ◽  
Addition Amount

The separation of niobium and iron from the low grade niobium ore was researched by the technology process of reductive roasting and magnetic separation. Experiments of reductive roasting and magnetic separation were carried out in order to investigate the separation effect at different conditions of roasting temperature and addition amount of coal powders. The results show that the separation of niobium and iron can be realized, meanwhile the niobium can be enriched in the magnetic tailings. The main mineral phase of niobium in magnetic tailings changes into NbC from (Ce,Nd)NbTiO5when the roasting temperature exceeds 1150°C. By magnetic separation after roasting with adding 37.5% coal powders at 1050°C, w(T.Fe) of the reduced iron is 86.11%, the percentage metallization is 87.6%, and the yield ratio of iron is 77.4%. Meanwhile, w(Nb2O5) of the magnetic tailings is 7.35% which is 2.4 times higher than low grade niobium ore, and the yield ratio of niobium is 98.1%.

scholarly journals Upgrading iron and removing phosphorus of high phosphorus oolitic iron ore by segregation roasting with calcium chloride and calcium hypochlorite

2019 ◽  
Vol 55 (3) ◽  
pp. 305-314 ◽  
Author(s):  
J. Xiao ◽  
W. Ding ◽  
Y. Peng ◽  
Qi. Wu ◽  
Z. Chen ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Calcium Chloride ◽  
Phosphorus Content ◽  
Magnetic Minerals ◽  
Calcium Hypochlorite ◽  
Iron Concentrate ◽  
Low Intensity ◽  
High Phosphorus ◽  
Oolitic Iron Ore ◽  
Western Hubei

The iron-bearing ore, existing in the form of oolite, was mainly composed of hematite, limonite, daphnite, and collophane. The harmful element phosphorus content was 1.56%, belonging to high phosphorus ooliticiron ore in western Hubei. In this study, segregation roasting and low intensity magnetic separation techniques were applied for upgrading iron and removing phosphorus. The ores, the chlorinating agent, and the reducing agent were mixed into the roasting furnace for segregation roasting. After being transferred from the weak magnetic minerals to the strong ones, the iron was recovered by low intensity magnetic separation. During segregation roasting, new ore phases, metallic iron (Fe), a small amount of ferroferric oxide (Fe3O4), and ferrous oxide (FeO) could be observed. The results showed that the iron concentrate with the Fe content of 90.3%, the phosphorus content of 0.15%, and the iron recovery of 92.9% were obtained under the segregation roasting temperature of 1273 K, and the roasting time of 90 min, CaCl2 (calcium chloride) 20%, Ca (ClO)2 (calcium hypochlorite) 3%, the dosage of coke 20%, and low intensity magnetic separation field intensity 0.12 T.

scholarly journals Influence of Sodium Sulfate Addition on Iron Grain Growth during Carbothermic Roasting of Red Mud Samples with Different Basicity

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1571
Author(s):  
Pavel Grudinsky ◽  
Dmitry Zinoveev ◽  
Denis Pankratov ◽  
Artem Semenov ◽  
Maria Panova ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Grain Growth ◽  
Red Mud ◽  
Sodium Sulfate ◽  
Phase Distribution ◽  
Solid Phase ◽  
Alumina Production ◽  
Metallic Particles ◽  
Iron Phase ◽  
High Alkalinity

Red mud is an iron-containing waste of alumina production with high alkalinity. A promising approach for its recycling is solid-phase carbothermic roasting in the presence of special additives followed by magnetic separation. The crucial factor of the separation of the obtained iron metallic particles from gangue is sufficiently large iron grains. This study focuses on the influence of Na2SO4 addition on iron grain growth during carbothermic roasting of two red mud samples with different (CaO + MgO)/(SiO2 + Al2O3) ratio of 0.46 and 1.21, respectively. Iron phase distribution in the red mud and roasted samples were investigated in detail by Mössbauer spectroscopy method. Based on thermodynamic calculations and results of multifactorial experiments, the optimal conditions for the roasting of the red mud samples with (CaO + MgO)/(SiO2 + Al2O3) ratio of 0.46 and 1.21 were duration of 180 min with the addition of 13.65% Na2SO4 at 1150 °C and 1350 °C followed by magnetic separation that led to 97% and 83.91% of iron recovery, as well as 51.6% and 83.7% of iron grade, respectively. The mechanism of sodium sulfate effect on iron grain growth was proposed. The results pointed out that Na2SO4 addition is unfavorable for the red mud carbothermic roasting compared with other alkaline sulfur-free additives.

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