gangue and copper sulfate is to be leached in a countercurrent multistage extractor using pure water to leach the CuSO4. The solid charge rate per hour consists of 10000 kg of inert gangue (B), 1200 kg of CuSO, (solute A), and 400 kg of water (C). The exit wash solution is to contain 92 wt % water and 8 wt % CuSO4. A total of 95% of the CUSO̟ in the inlet ore is to be recovered. The underflow is constant at N = 0.5 kg inert gangue solid/kg aqueous solution. Calculate the punmber of sta ges reauuired
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- 100 kg of roasted zinc ore with composition: 66% ZnO, 3% ZnS, 10% PbO, 14% Fe;0, 1% Al;O, 6% SiO; is reduced in a horizontal retort furnace with 45 kg coke having 90% C and 10% SiO,. In the furnace 91% of Zno is reduced to Zn 100% of Pbo is reduced to Pb 75 % of Fes0, is reduced to Fe, 25 % of Fe,O, is reduced to Feo Neglect the vaporization of Pb and Fe and accept that they will not reoxidize. 1. Determine the weight of zinc and the percentage of zinc gained from the ore. 2. Determine the theoretical weight of C required for the reduction of Zno and the percentage of the excess C. 3. Determine the weight and the percentage of the residual material in the retort furnace after the removal of zinc vapor.a) Calculate the composition, in weight percent, of an alloy that contains 218.0 kg titanium, 14.6 kg of aluminum, and 9.7 kg of vanadium. b) Aluminum-lithium alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. A commercial aircraft skin material having a density of 3 2.55 g/cm is desired. Compute the concentration of Li (in wt%) that is required.A 0.8965g ore sample is dissolved in nitric acid and then filtered. The aluminum is present in solution as AP". The solution is made basic with ammonium hydroxide, NH,OH, and the aluminum hydroxide, Al(OH)» (FW 78.004), precipitates. This gel is filtered in a porous glass crucible, rinsed with dilute ammonium hydroxide, ignited, cooled in a desiccator, and weighed. The resulting alumina, Al;O; (FW 101.94), weighed 0.1605 g. Why is the solution filtered after acid dissolution? Why rinse with ammonium hydroxide solution? What chemical transformation takes place during ignition? (Show the balanced chemical equation) • Why use a desiccator during cooling? Calculate the weight percent Al (AW 26.9815) in the sample. Al(OH)) -> Al;O, + H0
- A 1.250 g sample of bauxite (the primary ore of aluminum) was analyzed for aluminum. The sample was powderized and treated in concentrated nitric acid. The nitric acid was removed and solids were treated in hot water with added nitric acid. Insoluble solids were removed by gravity filtration. The solution was made basic by the slow addition of dilute ammonia forming the gelatinous precipitate (Al(OH), and Al,O,.x H2O). The precipitate was heated to coagulate it then filtered over filter paper. The paper and solids were placed in a porcelain crucible and the paper was ashed while the precipitate was ignited at 600°C to convert the precipitate to pure Al,O,. The mass of Al,O, recovered was 0.2890 g. The average mass of ash after charring 10 sheets of the identical filter paper was 0.0007 g. Calculate the percent aluminum in the bauxite ore sample.A soil is analyzed for total iron content by dissolving 0.1 g of soil in 10 mL of acid and digesting in a pressure bomb. The digest is filtered, diluted to a final volume of 100 mL, and analyzed for Fe. The total Fe in solution is 40 mg L-1. What is the total iron concentration in the soil in mg kg (ppm) and mmol kg 1? (Atomic wt. Fe = 55.8 g mole-1) (Show your work) %3DA composite specimen has a dimensions with length (5 cm) and width (3 cm) and height (1 cm). Consist of (Al) as a matrix and (Al,O;) particles as a reinforcement. The volume fraction of (Al) matrix was (70 %). Calculate the mass of (Al) and (Al;O;) and the total mass. Note: Ps =3.077 g/cm³ Pm =2.69 g/cm³
- b) A plot of land was explored and found to contain 1,000,000 grams of gold. The average goldconcentration was found to be 0.8 grams per ton. A mine was set up on it and sluice boxes were used as the main gold recovery units and recovered200,000 g of gold from 80% of the ore. The concentration ratio of the sluice boxes was 10,000.The field was mined again. On this occasion bowl concentrators were used. The feed used wasestimated to be 800,000 tons and the concentration ratio of this unit was 20,000. 750,000 grams ofgold was recovered. Calculate the following: i) the Quantity and grade concentrate from the sluice boxes .................. ..................... ii) the quantity and grade of the concentrate from the bowl concentrator plant. .............. iii) the quantity and grade of the material remaining at this location...................................When the high-temperature superconductor yttrium barium copper oxide is heated under flowing H,, the solid remaining at 1000°C is a mixture of Y,O,, BaO, and Cu. The starting material has the formula YBa, Cu,0,-, in which the oxygen stoichiometry varies between 7 and 6.5 (x = 0 to 0.5). %3D 1000°C YBa, Cu, O, (s) + (3.5 – x)H,(g) FM 666. 19-16.00x -Y,0,(s) + 2 BaO(s) + 3 Cu(s)+(3.5 – x)H,O(g) YBa, Cu,Oss Thermogravimetric analysis. When 37.329 mg of YBa, Cu, O, , were subjected to this analysis, 34.435 mg offsolid remained after heating to 1000°C. Find the value of x in YBa, Cu,O, - Propagation of error. Suppose that the uncertainty in each mass is +0.002 mg. Find the uncertainty in the value of x.56EF3A79haQqAAmRHdBhZQvrwNmdPsuA4 Ing and Conditions Subject Test pard Note: - You are attempting question 5 out of 12 To find the Ce content of a solid, 4.37 g were dissolved and treated with excess iodate to precipitate Ce (IO,),. The precipitate was collected, washed well, dried, and ignited to produce 0.104 g of CeO, (FM: 172.114). What was the weight percent of Ce in the original solid? (A) 1.84% (B) 1.49% (C) 1.94% (D) 1.74% Answer A B Submit P Type here to search 王 立
- Data Mass of unknown metal Cark te ?l.005g Volume of uniknown solotion CmL) Volume of HCI added Inital burct readinglmL) Final buret reading (mL) 20.00ML (mL) 15.00mL 20.SSmL 30.90ML Volume Na OH delivered (m L) Concentration of HCI: O.1708M Concentrahon of NaOH: O.1000M * Pipetted 10.35mL 20.00mL Of solution prepared in 250.0 mL volumetric flask Questions', 1. Calalate the number of moles of Na OH used for back titration? 2. Calculate the number of moles moles of metal carbonate present in 20.00mL portion of the metal Carborate soltion? 3. Calculate molar masS of 3.Calculate in knon metal carbongteThe average copper grade of the ore is 0.7 %. The total pregnant solution flowrate from all the leach pads is 8 000 m3/hr, with an average concentration of 1.8 kg/m3, with the concentration of copper in the lixiviant that is irrigated onto the heap being 0.2 kg/m3 (ignore any solution or copper losses to the environment in these calculations). What is the average copper recovery for the process?20212 -202 A blast furnace makes pig iron containing 3.2% and 1.8% of Carbon and Silicon and remaining as Iron respectively. The ore is a combination of 80%, 12% and 8% of Iron Oxide, Silica and Aluminum Oxide respectively. The process requires coke at a rate of 1 Kg per kg of pig iron produced. The coke is adulterated with Silica with 10% of silica and remaining to be carbon. The flux is obtained at a rate of 0.4 kg per kg of pig iron and is the base of one tonne of pig iron containing pure Calcium carbonate. The blast furnace gas has 30% CO and 15% CO2. calculate the following assuming the 1. The weight of core used. 2. The weight of slag made. m504ssary data required: [15] 504-888/7/2024/04/28-202nsidering t 3. The volume of the blast-furnace gas. 4/28-202123am504-88817-20 Produced,2 88817-2024/04