Two-high reversing mill

Most primary hot rolling is carried out in either a two-high reversing mill or a three-high continuous mill. 

In the two-high reversing mill, Fig. 15.3, the metal is passed between the rolls in one direction. The rolls are then stopped, closed together by an amount depending on the rate of reduction required, and reversed, taking the material back in the opposite direction. This is repeated, with the rolls closed a little more each time, until the final size of section is reached. At intervals throughout this process, the metal is turned on its... 

In the two-high reversing mill. Fig. 16.3, the metal is passed between the rolls in one direction. 

Koyuncu et al. [56] presented pilot-scale studies on the treatment of pulp and paper mill effluents using two-stage membrane filtrations, ultrafiltration and reverse osmosis [56]. The combination of UF and RO resulted in very high removals of COD, color, and conductivity from the effluents. At the end of a single pass with seawater membrane, the initial COD, color and conductivity values were reduced to 10-20 mg/L, 0-100 PCCU (platinum cobalt color units) and 200-300 ps/cm, respectively. Nearly complete color removals were achieved in the RO experiments with seawater membranes. 

A similar result was obtained by Liu et al. In this case, inclusion of a high-energy mechanical milling (HEMM) step between the two thermal pyrolysis reactions of PVDF resulted in a sihcon/disordered carbon composite, in which the active silicon cores were homogeneonsly distributed within the pyrolyzed carbonaceous matrix. The composite offered a reversible capacity of ca. 900 mA h g within 40 cycles and a relatively high conlombic efficiency of 80% over the initial cycle. 

---