Chromite ore by industrial uses into metallurgical grade, chemical grade, refractory grade level and cast stone.
1 metallurgical grade chrome ore industry requirements
Metallurgical grade chrome ore is mainly used for smelting of ferrochrome alloy. For smelting of chromite ore and ferrochrome smelting purposes at different grade is divided into four.
In addition to these components requirements for carbon ferrochrome smelting blast furnace blocks degree requirements for the 40 ~ 75mm, carbon ferrochrome smelting furnace blocks degree 40 ~ 50mm.
Metallurgical grade chromite ore smelting metal chromium can also be used, the current methods of chromium smelting fire and wet two. Requires the use of hydrometallurgical chromium: chromium ore or concentrate containing Cr2O3 ≥ 38%, Cr2O3/FeO> 2, SiO2
(2) refractory grade chrome ore industry requirements
In the refractory industry, chromium ore is mainly used to manufacture magnesium chrome brick, chrome brick and chrome aluminum bricks.
For the production of refractory grade chrome ore is divided into two. A natural product used as a refractory material, quality requirements: Cr2O3 ≥ 35%, SiO2 ≤ 8%, CaO ≤ 2%. Two products for the production of chrome brick, chrome brick, quality requirements: Cr2O3 ≥ 30% ~ 32%, SiO2 ≤ 11%, CaO ≤ 3%.
These two grades, ore blocks are required degree between the 50 ~ 300mm, and the ore is not allowed to have more than 5 ~ 8mm in with stone.
3 chemical grade chrome ore industry requirements
In the chemical industry, chromium ore is mainly used to produce dichromate (chromium salts), then it is the production of other chromium compounds as raw material products. Chromium chromium ore with industrial requirements: Cr2O3 ≥ 30%, Cr2O3/FeO ≥ 2 ~ 2.5, SiO2 small.
4 cast stone grade chrome ore industry requirements
For the production of chrome ore diabase, and its quality requirements: Cr2O3 ≥ 10% ~ 20%, SiO2 ≤ 10%.
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