Process for recovery of alumina using tricalcium aluminate
A technology of tricalcium aluminate and alumina, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, aluminum compounds, etc., can solve the options and limitations that affect greenhouse gas emissions And other issues
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Embodiment 1
[0083] Example 1: TCA is converted to calcite
[0084] Synthetic TCA was produced in the laboratory and reacted with 60 g / L of sodium carbonate (Na 2 CO 3 ) reaction to compare the kinetics of the reaction and the degree of conversion of TCA to calcite.
[0085] When testing with RWB, samples were taken at intervals of 5, 10, 20, 30, 45, 60, 90, 120, 180, 240, 300 minutes, 24, 30, 48, 54 hours using 20 mL syringes. These samples were filtered, cooled, and analyzed using titration to determine 'A', 'C', and 'S' concentrations. After 54 hours, the remaining mixture was removed from the RWB and filtered. The filtrate was collected and the solid was washed in ice-cold DI water before being studied as a wet sample on XRD.
[0086] When using an autoclave (AC) for the test, add 1000 mL of 60 g / L Na to the AC 2 CO 3 , then sealed and equilibrated to 60°C. 73.09 g of synthetic TCA was added to the AC and then resealed. Samples were taken at the same intervals as given above ...
Embodiment 2
[0088] Embodiment 2: matrix test
[0089] The matrix test was designed to demonstrate that the reaction temperature and the concentration of sodium carbonate ([Na 2 CO 3 ])Effect. The results of these experiments demonstrated that for a given [Na 2 CO 3 ], the conversion of TCA to calcite is more favorable at higher temperatures. And, at constant temperature, with the initial [Na 2 CO 3 ] (ie [S]) increase, the material Na 2 CO 3 Responsiveness increases, but C / S implementation decreases.
[0090] The matrix test procedure is given in Table 1 below.
[0091] Table 1: Matrix test conditions
[0092]
[0093] A total volume of 300 mL of each solution was added to a 500 mL polypropylene bottle and added to a water bath at each temperature. Once the vials equilibrated, TCA was added in various amounts. Samples were taken at various times and analyzed for 'A', 'C', and 'S' concentrations.
[0094] Kinetic test:
[0095] Kinetic experiments were designed to eval...
Embodiment 3
[0102] Embodiment 3: stirring effect
[0103] [NaL at 60°C and 40g / L 2 CO 3 ] The test procedure given in Example 2 was repeated to determine the effect of stirring (if any) on the kinetics of the reaction. It was determined that tests performed using a vigorously agitated autoclave were no faster than equivalent tests using a rotating water bath.
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