Corrosion and its Prevention in the Mining Industry

The corrosive environment of the mining industry limits the life span of the processing equipment and as a result decreases production and endangers lives of personnel. Some examples of mining equipment prone to corrosion are (i) wire rope (ii) roof bolts (iii) pump and piping systems (iv) mining electronics and (v) acid mine drainage. 

Roof bolts provide support in underground mines by tying the lower layer to a stronger layer located above the main roof. These are low-carbon steel bolts and about 120 million/year, and corrosion failure of the bolts is hazardous and can result in loss of lives. In sulfide mines, roof bolts fail within a year because of sulfide SCC. 

Corrosion within pump and piping systems is another problem, and general uniform attack is common. Pitting, crevice corrosion, intergranular corrosion, dealloying, galvanic corrosion, and cavitation corrosion are also possible depending on the environment. 

Erosion-corrosion in milling is another problem. Particulates in a corrosive medium go through pipes, tanks, and pumps. The particulates erode and remove the protective film on the metal and expose the metal surface to high velocity impingement, thus accelerating corrosion. 

Harsh environments in the mines can cause electrical equipment to fail after a short time and it can be avoided by a suitable enclosure. 

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