Results are provided for a study of the phase transformation during heating of kyanite concentrates of the Karabash deposit, and the effect of temperature, soaking at the final temperature, and grain size on parameters of kyanite thermal decomposition. IR-spectra for kyanite concentrate of a different degree of transformation, and the microstrcuture of a partially decomposed kyanite grain are given. It is shown that thermal decomposition of kyanite proceeds in the range 1300 -1400°C, and linear expansion, temperature for the start and decomposition rate depend on kyanite grain size, and the relaxation of elastic stresses of the kyanite crystal lattice is mainly limited by the decomposition reaction factor.One of the most important trends in the world for developing production of aluminisilicate refractories is expansion of the output of high-alumina and a reduction in the production of chamotte that is due to the better stability of high-alumina refractories towards the action of elevated temperatures and corrosive agents. Production of high-alumina refractories is based on artificial starting materials (commercial aluminina, electrocorundum) and on natural raw material, i.e. rock laid down with minerals of a high Al 2 O 3 content. The reserves of these minerals in nature are significant, and this gives rise to their extensive use in the production of refractories in many countries. The main condition for use of natural raw material is its low cost compared with artificial materials that are normally produced by quite complex and very energy-consuming technology. If in a complicated economic situation a natural raw material appears to be cheaper, it provides the required Al 2 O 3 content in refractories, and the level of the concentration technology makes it possible to obtain quite pure material free from impurities, then use of this raw material is preferable. From a physicochemical point of view the advantage of high-alumina materials over artificial materials is the fact that the Al 2 O 3 content is more active in heat treatment since it enters into the structure of compounds (silicates, hydrates, etc.) preventing a change in the crystal lattice during heating.One of the forms of natural high-alumina raw material are minerals of the silliminite group (kyanite, andalusite, silliminite). Interest in them is also due to their facility to decompose thermally with expansion into mullite and silica glass. Currently the proportion of unmolded refractories in linings of heating units continues to increase, among which aluminisilicate refractories comprise a considerable part, and therefore the requirement for additions balancing shrinkage, and also high quality shrinkage-free fillers is also considerable.The reserves of kyanite minerals of Russia occupy one of the first positions in the world. Large northern (Kiev, Khizovaarsk) and also Eastern Siberia (Kyakhtinsk, Kitoisk, Chainytsk) deposits are well known but they are difficult to access. There are deposits of Kyanite in the Ural (Borisov, Karabash, Mikhailov, Mal...

Construction and operation are described for overseas tubular belt conveyer (TBC) systems. Distinguishing features are established for turning over the lower run of the conveyer belt and the main fundamental limitations for TBC parameters. Technical characteristics for the domestic rubberized-fabric belt used, properties and transportation conditions for loads of the building industry TBC are presented. The advantages of TBC over belt conveyers are listed.

The effect of impurity minerals and oxides RO, R 2 O 3 and RO 2 (R II =Mg,Ca, R III =Fe,Cr, R IV =Ti,Zr) on thermal decomposition parameters for kyanite concentrate of the Karabash deposit, linear expansion of composition with continuous heating, physicomechanical properties and change in specimen phase composition, are studied.

Tipping of loose material from a container is considered, with which there is a uniform tipping stream, lump flight, an increased lump flight, and incomplete material tipping. The maximum lift of the spiral guide, with which there is unhindered passage of containers over the unloading section, is determined. The dependence of the length of the open unloading section on container movement rate, rotation angle at the instant of flight of the last particles within them, and on particle acceleration and angular velocity, are determined.

A detailed description is provided for construction and operation of tubular scraper conveyers (TSC). Comparative evaluation and technical characteristics of TSC are provided. TSC advantages and disadvantages are listed. A procedure is given for determining TSC production parameters.