Method for recovering tungsten from heteropoly acid sludge containing silicon and tungsten

The invention discloses a method for recovering tungsten from heteropoly acid sludge containing silicon and tungsten. The method comprises the following steps of (1) carrying out size mixing, filter pressing and water washing on the silicon-tungsten-containing heteropoly acid sludge by using hot water until the silicon-tungsten-containing heteropoly acid sludge is neutral so as to leach out part of tungsten to obtain a first filtrate and a first filter residue; (2) carrying out ball milling on the first filter residue, adding a first auxiliary material and a second auxiliary material, carrying out first boiling, and filtering to obtain a second filtrate and a second filter residue; and (3) adding a third auxiliary material into the second filter residue, carrying out second boiling, and filtering to obtain a third filtrate and tailings. The method can effectively solve the problem of tungsten recovery in the sludge containing the silicon-tungsten heteropoly acid, so that the tungsten in the silicon-tungsten h