After the ground fresh air enters the mine, it is polluted by the dust generated by rock drilling, blasting, loading, transportation, etc., as well as the harmful gases generated by the decay of the pit wood and the oxidation of the ore, thus becoming dirty air in the underground. Its composition i
[Chinese instrument network meter patent] creative limit, instrumentation invention. Today we introduce a national patent for invention-intelligence induction water meter. The patent was applied for by Guangzhou Zhaoji Instrument Manufacturing Co., Ltd. and was authorized on May 24, 2017. Content D
Yunnan smelter copper anode slime treatment began in 1969, using traditional domestic fire process, years of industrial practice shows, lead, selenium and environmental pollution, harsh operating conditions, high processing costs, precious metals recovery rate is low, only 65 %~82%. To this end, in