A UDC 669.1 9:620.193AHornblendite rock castings* are being used successfully as a material resistant to abrasive wear. The presence in its structure of a phase with a chain or band member of silicon oxide tetrahedrons provides sufficient chemical resistance for parts in many aggressive media.The chemical resistance of hornblendite castings in a number of aggressive media has been investigated at the S. M. Kirov Ural Polytechnic Institute. Figure 1 shows data on the resistance of a hornblendite casting in boiling solutions of H~SO4, HC1, and HNO 3. As may be seen, in short time tests (up to 5 h) the most corrosive to cast hornblendite is HCI and in long tests HNO 3.Experience has shown that the relative losses of the components of cast hornblendite AI~O 3 and SiO 2 in an H2SO 4 solution are about the same, while in solutions of HC1 and HNO 3 the A1203 dissolves far more actively than SiO 2 . *Hornblendite is a rock which is the waste from beneficiation of iron ore. The main constituent mineral of the rock is hornblende.

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