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Pre-treatment, Concentration, and Enrichment of Precious Metals from Urban Mine Resources
Published in Sadia Ilyas, Hyunjung Kim, Rajiv Ranjan Srivastava, Sustainable Urban Mining of Precious Metals, 2021
Hyunjung Kim, Sadia Ilyas, Rajiv Ranjan Srivastava
The impact crusher uses high-speed impact or sharp blows to the free-falling feed rather than compression or abrasion. Hinged or fixed heavy metal hammers (hammer mill) or bars are attached to the edges of horizontal rotating discs. The hammers, bars, and discs are made of manganese steel or cast iron-containing chromium carbide. The hammers repeatedly strike the material to be crushed against the rugged solid surface of the crushing chamber, breaking the particles into uniform size. The final fine products drop down through the discharge grate, while oversized particles are swept around for another crushing cycle until they are fine enough to fall through the discharge gate. Impact crushers (Figure 2.9) are widely employed for secondary or tertiary crushing (Cui and Forssberg, 2003).
Screw Conveyors and Feeders
Published in Muhammad E. Fayed, Thomas S. Skocir, Mechanical Conveyors, 2018
Muhammad E. Fayed, Thomas S. Skocir
The use of special materials of construction is also recommended when conveying abrasive solids. The screw can be manufactured from abrasion-resistant metals such as hardened manganese-steel. Hardfacing may also be used; this is discussed later in this chapter. Both screws and troughs can also be constructed out of thicker gauge sheet steel. Special bearings and couplings are also required for abrasive materials.
Effect of Annealing on Heavy-Load Wear Performance of Wear Resisting Steel–Carbon Steel–Cladded Plate
Published in Tribology Transactions, 2021
Pengtao Liu, Lifeng Ma, Chenchen Zhi, Ziyong Ma, Cunlong Zhou, Guanghui Zhao, Qinhong Fan, Weitao Jia
Because austenitic high manganese steel is characterized by high fracture toughness and high work-hardening properties, it is generally used in the key components of railway, mining, and other industries, such as crusher plates, that require high impact abrasion and sliding wear resistance (8). However, the high wear resistance of austenitic high-manganese steel cannot be maintained under the conditions of low impact load or stress, which can easily lead to the early failure of key parts. Therefore, low-carbon high-alloy steel or high-chromium cast iron have been utilized to replace austenitic high-manganese steel in some research works (9).