[Results] The incidence of occupational diseases and injuries in the common mechanical manufacturing industry (CMM) (4 95‰),industry of mining and dressing of ferrous metal (MDFM) (4 67‰),non metal mineral manufacturing industry (NMMM) (4 54‰),oil processing industry (3 97‰) and smelting and mangling process of ferrous metal (SMPFM) (3 64‰) was found.
The ferrous metal in sludge can be recovered by 100%,the water quality after treatment is close to ss < 200 mg/and 9 pH value and therefore a clean environment necessary for smoothly running a steel works and marked economical efficiencies are obtained.
The north part of North China craton is abundant in non ferrous metal resources,richin Sn in the external margin,Mo in the internal margin,and Cu Pb Zn throughout the whole margin.
A polyfunctional surface treatment fluid for ferrous metal used at thenormal temperature is developed by taking H3PO4,ZnO,and H as the main raw materials. Itsperformance and parameters have reahed the standard of GB/T12612-90. Its action mechanism is also briefly discussed.
The treatment of ferrous metal parts by ion bombardment, including nitriding, carburizing, carbonitriding, etc, is realized by the process of glow discharge in different atmospheres at low pressures. The nature of the glow discharge transforming to the arc discharge, and the requirements of the generators for the glow discharge in accordance with the necessity of heat treatment are discussed in this paper. Here, the authors suggest 3 kinds of electric circuits being used in ion nitriding equipme...
Treatment of ferrous metal parts by ion bombardment, including nitriding, carburizing, carbonitriding, etc., is realized by the characteristic process of glow discharge in different atmospheres at low pressure. The nature of the glow discharge transforming to the arc discharge, and the source for the glow discharge in accordance with the necessity of heat treatment are discussed in this paper. Here, the authors suggest three kinds of electric circuits to be used in ion nitriding equipments. One ...
This paper gives an overall description of the technical development of non- ferrous metal mining since the establishment of the People's Republie of China. Nu- merous figures presented show that China is rich in nonferrous metal resources and complete in the range of metals available, with a high rate of expansion in produc- tion as well as in the number of operating mines. Based on analysis of the present state of production and technology in more than 100 major nonferrous metal...