Leaching countercurrent

Material balance in countercurrent leaching still is represented by Eqs. (14.14) and (14.16). Compositions Rk and Ek+1 are on a line through the operating point P, which is at the intersection of... 

Countercurrent Leaching with Variable Underflow. In practice most applications have a variable underflow, which is normally greatest al lhai point in the process where the solute concentration in the solvent is highest. 

Sodium nitrate (Chile saltpeter, NaN03) occurs naturally in the highlands of Chile and countercurrent leaching and crystallization produces a good-quality product. 

FIGURE 9.6 Stage diagram for multistage countercurrent leaching (Example 9.2). 

The steeping operation is, in effect, a countercurrent, leaching oper-... 

A countercurrent leaching system (Figure 32) is to treat lOkg/h of crushed sugar stalks with impurity-free water as the solvent. Analysis of the stalks is as follows ... 

M. Desai, "Analysis of Multistage Nonequilibrium Countercurrent Leaching System," Ph.D. thesis. University of Massachusetts, Amherst, 1977. 

Countercurrent leaching plant. A, launder B, rake C, slurry pump. 

Any suitable mixer and settler can be chosen for the individual units in a countercurrent leaching system. In those shown in Fig. 17.3 mixing occurs in the feed troughs (known as launders ) leading to each tank and also in the upper parts of the tanks themselves. Rakes B move settled solids to the discharge, and pumps C move the slurry from tank to tank. 

Fig. 6.2-6 Scheme and graphical presentation of four stage countercurrent leaching... 

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