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O. I. Mikhailova
O. I. Mikhailova
Research & Discovery Centre of «Aluminium of Kazakhstan» JSC
Research & Discovery Centre of «Aluminium of Kazakhstan» JSC

Articles

Without section
  • Date submitted
    2012-09-26
  • Date accepted
    2012-11-13
  • Date published
    2013-03-01

Hydrochemical processing of red sludge «Aluminium of Kazakhstan» JSC

Article preview

The impact of operating conditions of red sludge autoclave leaching with high-modulus alkali-aluminate solutions such as duration, temperature, limestone dosing rate, caustic alkali concentration, and pulp liquid-to-solid ratio on extraction of valuable components: alumina and alkali has been explored. The behavior of hydrogarnet sludge during thickening, washing and filtration has been checked under laboratory conditions. Researches were held and optimum parameters of solutions’ caustic module conversion have been chosen. The optimum alternative of process chart of hydrochemical branch as applied to red sludge processing at «Aluminium of Kazakhstan» JSC has been  chosen.

How to cite: Budon S.V., Ibragimov A.T., Mikhailova O.I., Medvedev V.V. Hydrochemical processing of red sludge «Aluminium of Kazakhstan» JSC // Journal of Mining Institute. 2013. Vol. 202. p. 44.
Metallurgy, physical and chemical regularities of technological processes
  • Date submitted
    2011-08-23
  • Date accepted
    2011-10-12
  • Date published
    2012-02-01

Research of activating additives influence on ferrous hydrogarnet synthesis

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We have studied the influence of activating ferrous additives on alumina and alkali recovery during the process of red mud lixiviation in autoclaves with the use of high-modulus alkalialuminate solutions and in the presence of lime. The effectiveness of usage of additives, containing sodium and calcium ferrites, during hydrochemical processing of red muds of Bayer process according to hydrogarnet technology, has been shown: increase in alumina recovery by 5-8 %, the possibility to conduct the process at average temperatures 240-260 °С and reduced concentrations of caustic alkali up to 200  g/dm3.

How to cite: Budon S.V., Ibragimov A.T., Mikhailova O.I., Medvedev V.V. Research of activating additives influence on ferrous hydrogarnet synthesis // Journal of Mining Institute. 2012. Vol. 196. p. 117.