Chromite purification methods and equipment

April.18,2024

Chromium, as an important raw material for stainless steel, has always been an important metal resource. Chromite resources are mainly distributed in South Africa, India, Zimbabwe and other countries. What are the beneficiation processes used in processing chromium ore?

At present, chromium ores with industrial value are generally chromium-magnesia spinel or chromium-iron spinel minerals, which contain a large amount of chromium oxide, with a content of about 18% to 62%, and generally also contain metals such as aluminum and nickel. Its characteristics make the chromium ore beneficiation process present a rich and diverse state.

Due to the properties of chromium, chromium ore beneficiation processes include gravity separation, magnetic separation, flotation, combined beneficiation, chemical beneficiation, etc. Commonly used in industry are single gravity separation, single magnetic separation, and gravity-magnetic combined beneficiation processes. In terms of equipment selection, shakers and jigs are mostly used in the gravity separation stage, while the equipment selection in the magnetic separation stage is determined based on the magnetism of the ore.

A chromium ore in the Philippines has a chromium oxide content of 23.47% and contains a small amount of pyrite and pentlandite. The gangue minerals are mainly serpentine and a small amount of carbonate. In the mineral processing test, magnetic separation, shaking table and spiral were used respectively. The chute was used for coarse separation and tailing testing. The test results showed that the shaking table and the spiral chute had better tailing effects, but the tailings yield of the spiral chute was lower. Therefore, a shaking table was used for separation. After the test scale was expanded, the grinding was targeted. One variable was tested, and the chromium ore beneficiation process finally adopted was a stage of shaking table roughing, the medium ore in the shaking table was directly re-selected, the medium ore was roughed in the concentrate, and the re-selected concentrate was combined. This process resulted in a concentrate yield of 57.19%, a chromium oxide grade of 37.46%, and a recovery rate of 88.78%. bituman