Effect of magnesium salts on the production of tcha and the feasibility of using the resulting compounds in the leaching of bauxites
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It is known that when different bauxite ores are being processed by the Bayer method, the introduction of lime and other calcium-bearing additions helps improve the indices of such operations as leaching, thickening, desiliconization, and filtration. Lime is also needed to obtain tricalcium hydroaluminate (TCHA), which is used as a filtering material on filters employed for the controlled filtration of aluminate solutions. Lime prepared from limestones obtained from different deposits differs appreciably in its chemical composition. To determine the feasibility of using magnesium-bearing limestones in alumina production, studies were made of the effect of magnesium salts on the leaching of bauxites, the production of TCHA, changes in the structure and filtering properties of TCHA during filtration, and the behavior of used TCHA during leaching.
Key wordsNa2Otitr – titratable alkali in solutions used for alumina production Na2Ocar – carbonate alkali in solutions used for alumina production Na2Ocaus – caustic alkali in solutions used for alumina production αcaus – caustic modulus of solutions used in alumina production μSi – silicon modulus of bauxite C3AH6 – tricalcium hydroalumosilicate (TCHA)
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