A manganese-vanadium concentrate precipitate containing V2O5 and MnO2 is formed on the stage of wastewater ozone treatment in sodium technology of vanadium-containing converter metallurgical slag processing. Vanadium content of the slag changes between 4 and 15 % wt and manganese content changes between 62 and 75,5 % wt. The article examines influence of concentrate with 14,33 % wt V2O5 and 65,44 MnO2 % addition in slag-with-soda furnace feed to determine positive effect on the result of roasting. Vanadium content of the slag is 22,34 % wt expressed as V2O5. Roasting temperature is 850 °C, Na2O/V2O5 molar ratio is 0,5:1, the concentrate is added as 0,25; 0,5; 1,0 mass ratio on the content of soda in starting furnace feed. Degree of vanadium conversion in water- and acid-soluble compounds is increased. The most effect is provided on the process of interaction between vanadium oxides and spinels with sodium compounds with formation of water-soluble vanadium forms. The optimal addition of concentrate is 0,25-0,5 mass ratio on the content of soda. Increasing of concentrate content is not effective. Both manganese and vanadium contained in concentrate give positive effect. Concentrate addition can be recommended for existing industry regardless of type of alkali addition on the stage of roasting.

Keywords: vanadium-containing slag, oxidating roasting with sodium, manganese-vanadium concentrate, increasing of vanadium yield, soluble compounds of vanadium and manganese

Circuit features of the electronics module for avalanche photodiode signal read-out, created on a basis of the specialized analog IC, are considered. Measurement re-sults of characteristics and noise depending on signal source capacity are given.

Keywords: avalanche photo diode, readout electronic, charge sensitive amplifier, shaper, electronics module