4為原料，然后通過(guò)碳熱還原-碳化獲得超細(xì)WC的方法。以PbWO4為鎢中間產(chǎn)品，避免了氨氮試劑的引入；采用碳還原的方式可避免水蒸氣的產(chǎn)生，抑制了鎢粉的長(zhǎng)大。結(jié)果表明：在初始pH為7.0、反應(yīng)溫度為160 ℃，反應(yīng)時(shí)間為4.5 h的條件下，Na2WO4溶液中99.9%（質(zhì)量分?jǐn)?shù)）以上的W以PbWO4的形式回收。然后采用低溫碳還原PbWO4，在C:W摩爾比為5、950 ℃的條件下還原3 h，獲得了W和C的混合物，該混合物中預(yù)加富余的C有助于抑制鎢粉的團(tuán)聚。然后將W和C混合物高溫碳化，在1200 ℃下反應(yīng)6 h，獲得了粒徑約為60 nm的WC粉末。;A novel method to prepare ultrafine WC was proposed: the PbWO4 prepared by hydrothermal synthesis was used as raw material, and WC was obtained through the carbothermic reduction-carburization process. PbWO4 was used as the tungsten intermediate product to avoid the introduction of ammonia nitrogen reagent. The carbon reduction method can avoid the generation of water vapor and inhibit the growth of tungsten powder. Results show that more than 99.9wt% of W is extracted in the form of PbWO4 from the Na2WO4 solution under the conditions of initial pH value of 7.0, reaction temperature of 160 °C, and reaction time of 4.5 h. Then, the homogeneous mixture of W and C is obtained by the carbothermic reduction of PbWO4 at 950 °C for 3 h with the molar ratio of carbon:tungsten as 5. Pre-adding excessive carbon in the mixture can inhibit the agglomeration of tungsten powder. Subsequ-ently, the WC powder with particle size of about 60 nm is obtained by the carburization of the W and C mixture at 1200 °C for 6 h."/>
4;ultrafine WC;hydrothermal method;reductive carbonization"/>