asked Gupta. Gani also emphasized the importance of reducing environmental impacts starting from the exploration stage of mining. Exploration that considers environmental impacts can lead to mine ...
The results indicate that gypsum can provide a selective effect on the direct reduction process of laterite nickel ore. A selective effect that lowers the grade of iron can occur due to the formation of iron sulfides. The use of 12% gypsum was able to produce a product with Ni grade of 4.13%, Ni recovery of 91.81%, and selectivity factor of 5. ...
THE EFFECT OF ADDITIVES AND REDUCTORS IN SELECTIVE REDUCTION PROCESS OF LATERITE NICKEL ORE. Selective reduction of laterite nickel ore followed by magnetic separation was carried out to produce ferronickel products. The effect of adding additives and reductor types in the selective reduction process was studied in this study. …
The reduction of nickel and iron in laterite ore was consistent with the thermodynamic calculation (Fig. 7). In addition, the microwave reduction performance at 800 °C for 30 min was comparable to that of conventional reduction of laterite ore at 1100 °C for 60 min (η Ni = 99.0% and η Fe = 70.8%). Obviously, microwave reduction of …
Read this article. Roasted calcine of a sulphidic nickel-iron ore and nickeliferous laterite ore were reduced in a horizontal tube furnace and in a laboratory …
The square ratio juris of the selective reduction process red soil nickel ore that the embodiment of the present invention provides is: as Fig. 2, following reduction reaction occurs nickel oxide in reduction furnace: C+CO 2 =2CO, NiO+CO=Ni+CO 2.Carbon in red soil nickel ore pelletizing generates CO by gasification reaction, and the …
The possibility of a preferential reduction of nickel in laterite was proposed by controlling the oxygen potential by CO 2 or H 2 O contents of various reducing gases (Antola et al., 1995).The effects of thermodynamic variables on the metallisation degree of iron, nickel, and cobalt were quantitatively evaluated using a bromine-methanol leaching …
Temperature reduction has a very important role in the reduction process of lateritic nickel ore, which will affect the reduction rate of metal oxide, both for nickel and iron [14]. A small dosage of reductants and more additives are usually used to prevent the reduction of iron oxide into metallic iron [12], [15]. However, the different.
This paper describes the microstructure evolution and phase transformation of residue from the lateritic nickel ore high-pressure acid leaching (HPAL) during carbothermic reduction using palm kernel shell (PKS) charcoal as a reductant. The study consisted of thermodynamic calculations combined with analysis of reduction …
The optimal reduction condition was observed to be laterite ore mix with 10 wt% coal and 9 wt% Na 2 SO 4, and roasted at 800 °C for 120 min. Leaching of the roast-reduced product performed in NH 4 OH–(NH 4) 2 CO 3 solutions (150 g/L total NH 3) was influenced by carbonate ion concentration and yielded >90% Ni and 67% Co. The …
3.2 Efficacy of Reduction Pre-treatment on the Extraction of Nickel, Cobalt and Scandium from Laterite Ore. Efficacy of reduction pre-treatment of laterite ore on the extraction of Ni, Co, and Sc was determined by comparing the %recovery obtained between leaching untreated ore and reduced ore (treated at 700 °C for 40 minutes) at 20 wt% …
DOI: 10.1016/j.powtec.2019.11.103 Corpus ID: 213804203; Kinetics study on non-isothermal carbothermic reduction of nickel laterite ore in presence of Na2SO4 @article{Liu2020KineticsSO, title={Kinetics study on non-isothermal carbothermic reduction of nickel laterite ore in presence of Na2SO4}, author={Yongjie Liu and …
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 nickel and iron components in the ore showed different temperature dependences during the reduction process from 300 ºC to 1100 ºC. For nickel, its metallization degree (η Ni ) varied with temperature in two different stages.
Abstract and Figures. This study present laboratory experiments carried out for nickel oxide reduction in a reverberatory furnace at medium pressure and a temperature range of 400˚C-1050˚C ...
In this study, the influence of basicity on reduction of nickel laterite ore was investigated. The results showed that it is possible to produce the ferronickel nugget directly at 1400 °C when the quaternary basicity [(m CaO + m MgO)/(m SiO2 + m Al2O3)] was fixed at 0.60. Under this experimental condition, the grade and the recovery ratio of ...
Mechanism of sodium sulfate in promoting selective reduction of nickel laterite ore during reduction roasting process," Int. J. Miner. Process., vol. 123
The first part of the experiment was the reduction of nickel laterite ore using natural gas; the reduction yielded mostly nickel metal and a small amount of iron forming fine nickel–iron particles.
Indonesia's 2020 decision to halt the export of nickel ore is a continuation of its industrial policy to produce downstream materials and products in the nickel and EV battery supply chain. In 2014, Indonesia successfully employed a similar export ban to develop downstream value-added nickel products for the stainless-steel supply chain.
The carbothermic co-reduction of nickel laterite ore and red mud realized the simultaneous reduction of nickel, iron in laterite ore, and iron in red mud at high efficiency. Nickel and iron in nickel … Expand
In a word, after carbothermal reduction and magnetic separation, high-grade magnetically separable ferronickel concentrates were successfully prepared by using laterite nickel ore, anthracite, and CaF 2 as raw materials, and the sample C1.4-F12 exhibited the highest iron grade of 63.96 wt% and nickel grade of 8.93 wt%.
The result showed that inner and outer coal in the carbothermic reduction process of laterite nickel ore can affect the selectivity performance of nickel. The best nickel recovery (93%) was obtained when using 70% inner coal and 30% outer coal. On the other hand, the best nickel content (13.99%) was achieved when using 90% inner coal …
Combined with the influence of laterite nickel ore addition on the metal recovery after metallization reduction of CBSL in "Chemical composition," when the laterite nickel ore addition is 6%, the recovery ratio of Fe, Cr, and Ni metal reaches the maximum value, which proves that the alloy particles wrapped in the slag phase become less ...
The low-grade nickel laterite ore used in this study was successfully upgraded through selective reduction by industrialized rotary kilns followed by magnetic separation. The results indicated that both iron metallization extent and nickel metallization extent showed obvious linear correlation. In addition, rational roasting temperature and …
Laterite ore is one of the important sources of nickel (Ni). However, it is difficult to liberate Ni from ore structure during reduction roasting. This paper provided an effective way for a robust recovery of Ni from laterite ore by H …
Separation and recovery of iron and nickel from low‒grade laterite nickel ore using reduction roasting at rotary kiln followed by magnetic separation technique. Mining, Metallurgy & Exploration ...
We studied the reduction kinetics of bulk NiO crystals by hydrogen and the corresponding structural transformations in the temperature range of 543–1593 K. A new experimental approach allows us to arrest and quench the reaction at different stages with millisecond time resolution. Two distinctive temperature intervals are found where the …
Reduction experiments of saprolite nickel ore were then carried out in a horizontal tube furnace with varying temperature (500 °C, 600 °C, 700 °C, 800 °C, and 900 °C), hydrogen gas composition (25 and 75 pct H2 in H2–Ar gas mixture), and reaction time (0.25 to 3 hours) to simulate the process in the rotary kiln.
Extracting nickel from sulfide ore generally refers to the process of melting nickel from nickel sulfide ore into low-nickel matte or leaching nickel into solution. Its …
In this paper, a research on preparing ferro-nickel alloy from low-grade saprolitic laterite nickel ore using metallized reduction-magnetic separation was studied. In the research, the ...
Along with the convergence of high-quality nickel sulfide ore resource is exhausted, the main source that red soil nickel ore will be nickel supply.At present, direct-reduction process becomes the popular research method of process red soil nickel ore.Wherein, rotary kiln nodulizing process (large rivers and mountains method) is the industry …
The main source of nickel has gradually become the recovery of ferronickel concentrate from low-grade laterite nickel ore. In this work, high-grade ferronickel concentrate was prepared by a reduction roasting-magnetic separation process, and low-grade ferronickel concentrate and CaF 2 were used as composite additives to promote …
We studied the reduction kinetics of bulk NiO crystals by hydrogen and the corresponding structural transformations in the temperature range of 543–1593 K. A new …
nickel ore having nickel less than 1.7% to recommenc e [20]. Together with the start of low-grade ferro- ... They investigated solid-state nickel extraction with a reduction roasting–magnetic.
