Magnesites from Larginsk sources

Conclusions

Magnesites from Larginsk sources have variable chemical composition; together with high-quality varieties containing high MgO contents, there are also magnesite-dolomite rocks.

A feature of the Larginsk magnesites is the almost complete absence of sesquioxides.

Larginsk magnesites in lump-sample form and grains are poorly sintered at 1550° and 1700°C, owing to which they become brittle; in a number of cases they crumble and form cracks and a lot of fines.

Finely milled and then briquetted magnesite sinters satisfactorily.

Larginsk magnesites after firing are weakly hydrated, with the exception of magnesite with a high CaO content, specimens of which during storage tend to crack and dust.

The Larginsk magnesites with a high CaO content, with additions of magnesium silicate rock, can be used to make high-grade dense stabilized briquette.

Goods made from Larginsk magnesites by briquetting and also from burnt lumps correspond to GOST 4689-49; they have a high RUL, which reaches 1700–1750°C, and low porosity.

Magnesite-chromite and periclase-spinel goods made from Larginsk magnesite and chromite satisfy the basic requirements of technical specifications for these goods.

Dolomitized magnesites can be used to give stabilized magnesite-dolomite goods of very high density and with a high RUL.

The investigation of the Larginsk materials should be continued in semiindustrial and industrial conditions.