Multi-deck air jigging machine

An air jigging machine (10) for dry processing of raw materials (17), comprising:

• a material-feeding mechanism (11, 12);
• an air funnel (28);
• an air supply conduit (32) for supplying working air (35) to said air funnel (28), wherein a pulsing valve (34) is disposed in said air supply conduit (32);
• at least two jigging-material carriers (15,16) for receiving material (17) from said material-feeding mechanism (11, 12), wherein said jigging-material carriers (15, 16) are configured to consecutively receive therethrough working air (35) from said air funnel (28) and to separate the material (17) into heavy material (18) and light material (19) layers, and wherein said jigging-material carriers (15, 16) are disposed one above the other and are jigging from one another by an intermediate space;
• a wall (40) for enclosing said intermediate space between said jigging-material carriers (15,16);
• at least one bypass airline (50a, 50b) that branches off from said air supply conduit (32) downstream of said pulsing valve (34), bypasses a lower one (16) of said jigging-material carriers (15, 16), and communicates with said intermediate space for supplying an additional working air flow into said intermediate space between said jigging-material carriers (15, 16);
• and
• a respective discharge device (20) for each of said jigging-material carriers (15, 16) for said material (17) layered during a jigging process.