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Al leaching efficiency increased from 72% to 80% as hydrochloric acid concentration increased from 1 to 4 m The total aluminum concentration in the leaching solution was determined by inductively coupled plasma optical emission spectrometer (icap7400 radial, thermo fisher scientific company, waltham, ma, usa) to calculate the leaching efficiency of total aluminum. Decreasing the particle size and increasing the temperature increased al leaching efficiency.

Ava (2020)

Quantity and concentration of the leaching acid were studied to determine the effect on aluminum recovery The second phase incorporated the concentration that yielded the best recovery (9 m hcl) while maintaining a temperature of 25 °c and examining leaching times of 6, 16, and 62 h. Tests were made with and without the addition of fluoride.

Abstract in this work the preparation of alumina from kaolinite by leaching with hydrochloric acid is studied

Crude kaolin was calcined at 850°c and then leached with 6 m hydrochloric acid at 90°c Aluminum hydroxide was precipitated by adding 6 m hcl solution to the leaching water. The effects of the concentration, temperature, and potential at the hydroxide/electrolyte interface on the aluminum hydroxide dissolution in sulfuric, hydrochloric, and perchloric acids are studied. Effects of particle size, leaching temperature, time, initial acid concentration, and sodium fluoride dosage, on the purity of carbon powder and aluminum removal rate, were investigated.

This research paper explores the potential use of bauxite tailings as an alternative secondary resource for alumina production, with an aqueous hcl process technology Bauxite tailings are solid waste produced during the mining and beneficiation of certain bauxites before their digestion in the bayer process The research was conducted in two.