2014-9-28 which is the key material for the production of different barium chemicals. Out of these the process of carbothermal reduction of barite is the most common and practiced method in barium industries. The author has noticed that in most industrial reductive operations the range of reduction is usually 35 to 40%, while theoretically a pure sample of barite should yield barium sulphide to the
2021-8-8 Keywords: Barite, Coke, Gasification, Catalyst, Sodium Carbonate ∗ Corresponding author: [email protected] 1- Introduction The theoretical approaches put forward by different investigators to describe the carbothermic reduction of barite, assume that the initial reaction of barite with carbon takes place where both barite and carbon particles
2012-1-25 Carbothermic reduction the initial step in conversion of barite into other barium compounds is its reduction (1073–1473 K) into water soluble barium sulfide (BaS) using coke, or other suitable reduction agent. This process is carried out in fluidizing bed or rotating furnaces.
The experimental results revealed that the mechanical activation process improves the kinetics of barite carbothermic reduction. It was found that 3.6 ks of milling decreases the activation energy...
2012-10-16 limited hence, reduction of this mineral to the water soluble compound of barium sulfide is inevitable [2]. Barite reduction can be performed by use of different reducing agents, such as methane [3], hydrogen [4], carbon monoxide [5] and solid carbon. Although reduction of barite by carbon starts at around 600°C, the rate of
Carbothermic Reduction Carbothermic reduction is also practiced [72 ]. Reduction is conducted in two steps involving the formation of niobium carbide: Nb 2 O 5 + 7 C = 2 NbC + 5 CO Nb 2 O 5 + 5 NbC = 7 Nb + 5 CO
The indirect reduction together with the carbon solution loss reaction is markedly activated with increas-ing temperature. At a moderate carrier gas flow rate, the carbothermic reduction rate reaches the highest value. The reduction can also be effectively improved with decreasing the graphite particle size.
The barite reduction could reach the maximum level (98%) after reduction by carbon monoxide at 850°C for one hour. Meanwhile, the same amount of reduction could have been achieved in shorter time
2019-10-21 The carbothermic reduction of manganese oxide from slag to metal droplets was studied across a range of conditions. Initial concentrations of carbon and manganese oxide were varied to 1, 2.5, and 4.3 and 5, 10, and 15 wt pct, respectively. Temperatures were
al.10) indicated that the carbothermic reduction of Cr 2 O 3 consists of two subprocesses; the CO/CO 2 transport reac-tion and the reaction of primarily formed Cr 3 C 2 with Cr 2 O 3. They also investigated the effect of amount of carbon and different types of carbon on reduction rate. Carbothermic reduction of chromium oxide was per-
2012-10-16 limited hence, reduction of this mineral to the water soluble compound of barium sulfide is inevitable [2]. Barite reduction can be performed by use of different reducing agents, such as methane [3], hydrogen [4], carbon monoxide [5] and solid carbon. Although reduction of barite by carbon starts at around 600°C, the rate of
2021-8-13 studies of the reduction of barite by carbon [3-8]. Recently, Gokaran et al. studied the non-isothermal carbothermic reduction of barite in the absence and presence of sodium vanadate catalyst [9]. All studies are unanimous of the opinion that initial reduction of barium sulfate with carbon takes place according to the following equation:
2 天前 Conclusions: The optimum conditions for carbothermic reduction were obtained at 4 h of ball milling of ilmenite with activated carbon and continuously annealing at 1000 °C for 2 h. Carbothermic reduction is applicable to upgrade Sri Lankan ilmenite ores, and thus this method adds value to heavy mineral resources in Sri Lanka.
et al. (2000) studied the no isothermal carbothermic reduction of barite in the absence and presence of sodium vana-date catalyst. All studies have similar results an initial reduction of barium sulphate with carbon. In this reaction is produced a carbon monoxide, which is used for a reduction barium sulphide too. Final products are BaS and CO 2.
2018-12-27 carbothermic reduction reactions can be greatly increased by pre-milling the mineral and carbon together compared to with powders milled separately and then mixed [16-19]. The effect of mechanical activation and extended milling on the carbothermic reduction of manganese ore [18], ilmenite [20], hematite [21], titanium oxides [22] celestite [19
The indirect reduction together with the carbon solution loss reaction is markedly activated with increas-ing temperature. At a moderate carrier gas flow rate, the carbothermic reduction rate reaches the highest value. The reduction can also be effectively improved with decreasing the graphite particle size.
2021-8-20 Abstract The recovery of major components of bauxite residue by carbothermic reduction at 1550–1750 °C and subsequent slag leaching in a Na3CO3(aq) solution is studied. Iron recovers primarily to pig-iron and lime is added to tune the calcium aluminate slags towards the highly leachable mayenite phase. The concentration of aluminum in the leachate correlates well with the occurrence of
2012-7-1 Carbothermic reduction alumina in vacuum was conducted, and the products were analysed by means of XRD and gas chromatography. Thermodynamic analysis shows that in vacuum the initial carbothermic reduction reaction temperature reduces compared with that under normal pressure, and the preferential order of products is Al 4 O 4 C, Al 4 C 3, Al 2 OC, Al 2 O and Al.
refractory sulphide–barite ore “Bobija” reduction by carbon to liberate lead, zinc, and copper sulphide from barite-pyrite base. In order to separate the barite, the ore was reduced with the carbon, wherein the barite is converted to the barium-sulfide [14,15]: BaSO. 4 + 2C = BaS + 2CO. 2
2021-1-6 Carbothermic reduction is the most successful mechanism to recycle Zn containing industrial wastes, such as EAFD. The widespread use of the Waelz kiln, however, exhibits considerable drawbacks, such as the improvable recovery rate (approx. 85 pct), the generation of Waelz slag and the high specific CO 2 emissions.
@article{Sun2016CarbothermicRS, title={Carbothermic reduction synthesis of red phosphorus-filled 3D carbon material as a high-capacity anode for sodium ion batteries}, author={Jie Sun and Hyun-Wook Lee and M. Pasta and Y. Sun and W. Liu and Yanbin Li and Hye Ryoung Lee and Nian Liu and Y. Cui}, journal={Energy Storage Materials}, year={2016
2016-3-1 carbothermic reduction of gibbsite, with initially Al(OH) 3þ3C is shown in Figure 1. The onset temperature of Al(g) formation at 10 7bar is 1170K. At 1400K and 10 7bar the equilibrium becomes AlðOHÞ 3 þ3C ¼ 3:00COðgÞþ1:00AlðgÞþ1:48H 2ðgÞþ0:04HðgÞð1Þ All the carbon consumed in the reaction would be converted into CO. By
2018-12-27 carbothermic reduction reactions can be greatly increased by pre-milling the mineral and carbon together compared to with powders milled separately and then mixed [16-19]. The effect of mechanical activation and extended milling on the carbothermic reduction of manganese ore [18], ilmenite [20], hematite [21], titanium oxides [22] celestite [19
et al. (2000) studied the no isothermal carbothermic reduction of barite in the absence and presence of sodium vana-date catalyst. All studies have similar results an initial reduction of barium sulphate with carbon. In this reaction is produced a carbon monoxide, which is used for a reduction barium sulphide too. Final products are BaS and CO 2.
2015-1-3 Jyotsna Agarwal /Int.J. ChemTech Res. 2014-15, 07(01),pp 246-250. 249 Fig. 2: Relative percentage of reduced and non-reduced snow-white barite using bone powder The role of bone powder in the carbothermal reduction of barites can be explained as follows:
2014-2-3 Figure 2: Extent of reduction on white variety of barite using sodium nitrite. The effects of sodium nitrite (used as reaction promoting agent) on the carbothermal anaerobic solid phase reduction of barites are shown in the Table 2. The general impact of sodium nitrite in the reduction is to increase the yield of barium sulphide.
2021-8-20 Abstract The recovery of major components of bauxite residue by carbothermic reduction at 1550–1750 °C and subsequent slag leaching in a Na3CO3(aq) solution is studied. Iron recovers primarily to pig-iron and lime is added to tune the calcium aluminate slags towards the highly leachable mayenite phase. The concentration of aluminum in the leachate correlates well with the occurrence of
2016-3-1 Keywords: alumina, aluminum, carbon, carbon monoxide, carbothermic reduction, vacuum INTRODUCTION Aluminum is the most abundant metallic element found in the Earth’s crust, amounting to 8.3% by weight of the crust. Aluminum metal has been first isolated in 1825 by the Danish chemist Hans Christian Ørsted. This metal, particularly its
2014-8-26 erations. The main purpose was to synthesise uranium carbide through carbothermic reduction. The synthesis method was developed through a serie of experiments. Ele-mental analysis for carbon, oxygen and nitrogen was performed on the product and modi cations were made to the method based on the results in the analysis. In
2003-3-27 [1] Since Dymond et al. proposed the paleoproductivity algorithm based on “Bio‐Ba,” which relies on a strong correlation between Ba and organic carbon fluxes in sediment traps, this proxy has been applied in many paleoproductivity studies. Barite, the main carrier of particulate barium in the water column and the phase associated with carbon export, has also been suggested as a reliable
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