Method for Recovering Nickel and Tungsten by Waste Nickel and Tungsten Catalyst

The invention provides a method for recovering nickel and tungsten by a waste nickel and tungsten catalyst.

The method comprises the following steps of: first, reducing roasting the waste nickel and tungsten catalyst at a high temperature to reduce nickel and ferric ions in the waste nickel and tungsten catalyst to metals nickel and iron, wherein other oxidants are not reduced; then, adding a copper liquid to the roasted material, replacing metals nickel and iron with copper ions, wherein nickel and iron are in ionic states to enter into the liquid; then, filtering and extracting the replaced and leached liquid; separating nickel from copper and iron, wherein the raffinate obtained by extraction is a pure nickel liquid which can be directly concentrated and crystallized to obtain nickel crystals; mixing the filter residue replaced and leached with sodium carbonate, roasting at a high temperature and washing with hot water to obtain a liquid containing sodium tungstate, wherein the filter residue is used for recovering aluminum and copper; performing acidification to the liquid containing sodium tungstate; and washing and drying the filtered filter residue with hot water to obtain tungstic acid with purity over 98.5%.


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