改进工艺操作条件提高金回收率

介绍了从铜阳极泥中回收金的工艺流程，指出了影响金回收率的主要因素。通过对工艺操作条件的改进，使金回收率由96．46％提高到98．50％。     

Improvement of the thermal operating conditions of steel-teeming ladles

The thermal state of a 30-t steel-teeming ladle is subjected to CFD simulation. The results obtained are verified by direct measurements of the lining and steel temperatures at various stages of technology under the conditions of an operating electric-furnace shop in a miniplant. The simulation results are used to determine the quantitative indices of the effect of the lining heating temperature on the energy consumed in steelmaking. It is shown that an increase in the temperature of the 30-t ladle lining by 100°C leads to a decrease in the temperature of metal tapping from EAF by ~11°C, which is equivalent to a saving of 4 kWh electric power per 1 t liquid steel.     

Precision alloys in critical operating conditions

The behavior of precision alloys in critical operating conditions is considered. The reaction of the alloy properties to time-dependent interference is predicted. Conditions corresponding to stable operation of the alloys are formulated.     

Rational operating conditions for ore-heating electrofurnaces

Means of improving the performance of ore-heating furnaces are considered. A method of calculating the thermal conditions in the furnace is proposed. This method permits automatic monitoring of the state of the lining. A regression model permits the construction of an automated control system for the ore-heating furnace.     

Sintered ferrous antifriction materials for arduous operating conditions

Summary The main methods by which the load carrying capacity of ferrous antifriction materials may be raised are to increase the strength of their metallic matrix by suitable alloying and to decrease their coefficient of friction by the addition of various sulfides. Researches in this field have led to the formulation of a new class of sulfidized ferrous materials. The investigation has shown that, if the load carrying capacity of a material is to be increased, the latter must contain structurally free graphite and sulfides, which secure the formation of stable working films with a low coefficient of friction. The best antifriction properties for the type of material investigated are ensured by a pearlitic-ferritic structure with a pearlite content of not more than 50%.The highest antifriction properties are exhibited by iron-graphite base materials containing 4% zinc sulfide with additions of 1% tin and 1% elemental sulfur.Translated from Poroshkovaya Metallurgiya, No. 8(56), pp. 39–45, August, 1967.