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Composition and properties of chromite ores from new deposits in Kazakhstan

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Conclusions

The chromite ores from the four deposits studied show a varying composition and a variety of physical properties due to their modification by secondary processes — metamorphosis and ancient weathering.

In chemical composition, most of the chromite ore samples after averaging come up to the required standard for the production of normal types of chrome magnesite parts. As far as this property is concerned, it is only some of the samples from deposit B which are unsatisfactory. For the production of important types of chrome-magnesite refractories, the ores need to be enriched or screened so as to separate the high-grade varieties.

All the mineralogical compositions of the chromite ores can be combined into six types with the following cementing binders: 1) serpentine; 2) serpentine-carbonate; 3) serpentine-carbonate-brucite; 4) serpentine-carbonate-chlorite; 5) serpentine-carbonate-amphibole; 6) serpentine-carbonate-quartz with the possible development in each one of iron oxides and hydroxides.

The centralized preparation of raw material and the organization of the enrichment of low-grade varieties will help to supply the refractory industry with chromite powders with identical composition and physical properties.

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References

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Zubakov, S.M., Yusupova, E.N. Composition and properties of chromite ores from new deposits in Kazakhstan. Refractories 3, 341–344 (1962). https://doi.org/10.1007/BF01342815

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