Silver recovery from antimony dust

[vjodhani]

When I charge Refinery Mud (obtained from lead electrorefining) in Noble furnace for reduction dust is collected in bag filters.This dust contains antimony ranging from 50-58% and silver from 1.5-2%.We are generating 20 tons of antimony dust on a monthly basis so effectively we are losing 300-400 Kg of silver.Is there any means to recover it?

 

[Lino1406]

Please give the description of stages in getting Sb dust, from raw material, source, including temperatures. What the rest of 42% besides antimony?