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Aluminum sulfate, commonly called alum, is produced as a concentrated aqueous solution from bauxite ore by reaction with aqueous sulfuric acid, followed by a three-stage, countercurrent washing operation to separate soluble aluminum sulfate from the insoluble content of the bauxite ore, followed by evaporation. In a typical process, 40,000 kg/day of solid bauxite ore containing 50 wt% A1203 and 50% inert is crushed and fed together with the stoichiometric amount of 50 wt% aqueous sulfuric acid to a reactor, where the A1203 is reacted completely to alum by the reaction
The slurry effluent from the reactor (digester), consisting of solid inert material from the ore and an aqueous solution of aluminum sulfate is then fed to a three-stage, countercurrent washing unit to separate the aqueous aluminum sulfate from the inert material. If the solvent is 240,000 kg/day of water and the underflow from each washing stage is 50 wt% water on a solute-free basis, compute the flow rates in kilograms per day of aluminum sulfate, water, and inert solid in each of the two product streams leaving the cascade. What is the percent recovery of the aluminum sulfate? Would the addition of one more stage beworthwhile?
What does LD 50 mean in Industrial Toxicology and What is its significance to workers handling pesticides What units are used to quantify the standard service illuminance for specific work activities? Name the instrument used to appraise the lig..
Determine the properties of the gas-vapour mixture using suitable models. Derive psychrometric relationships for the gas-vapour mixture and create the associated
air at 4mpa and 3000c enters a will insulated turbine operating at steady state with negligible velocity. the air
the paint formerly used on some storage tanks contained aluminum powder which reflected heat from the surface of the
Monczka-Trent has two options: (1) its standard 2-day shipment or (2) a subcontractor who will team drive overnight with an effective delivery of 1 day. The extra driver costs $175. Handfields's holding cost is 35% annually for this kind of inventory..
3.5 Calculate the reactor volumes required to process I043 liter/min of 3 molar .4 in the aqueous reaction A -+ 2B for PFTR and CSTR reactors. (a) 90% conversion, k 2 min-I (b) 99% conversion, k = 2 mole liter-' min-(c) 99.9% conversion, k 2 mole lit..
Why is it important - where does galvanising fit into possible corrosion protection strategies?)
Demonstrate Comprehension Level of Learning for preparation and submission of documents according to a specified form.
Suppose that for mass transfer of species A from a fluid flowing over a flat plate the Schmidt number is much less than one (Sc
Draw another diagram overlaying the Pourbaix diagrams for nickel and silver and use this diagram to explain the likely outcome of holding a solution of nickel ions in a silver container.
What were the materials used in the implant? What were the advantages of the materials used and what was the surface texture of these implants? How did this contribute to the biocompatibility of the implant?
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