Comprehensive recovery method of tungsten and molybdenum from slag of bismith smelting furnace

Abstract

The invention provides a comprehensive recovery method of tungsten and molybdenum from the slag of bismith smelting furnaces and bismith reverberatory furnaces, comprising the following steps: soaking the slag of bismith smelting furnaces and bismith reverberatory furnaces with alkali to obtain alkali leaching solution, oxidizing the alkali leaching solution with H2O2, adjusting the PH value withacid, then adding MgCl2 and (NH4)2CO3 to removing S<2->, SiO2, As and P for decontamination, extracting tungsten and molybdenum with N235 from the purified solution, washing the extract with water, back-extracting with ammonia water, concentrating and crystallizing the back-extracting solution and finally obtaining tungsten and molybdenum mixed oxides by roasting. The method has less pollution, strong adaptability, high tungsten and molybdenum recovery rate, and the tungsten recovery rate is more than 90% and the molybdenum recovery rate is more than 95%, thus reducing the production cost andproviding a new method for recycling tungsten and molybdenum simultaneously.

Description

technical field [0001] The invention relates to a method for comprehensively recovering tungsten and molybdenum in bismuth smelting reflective slag. Background technique [0002] For the bismuth concentrate containing W and Mo, W and Mo enter the smelting slag during the reverberatory furnace smelting process. The reverberatory furnace smelting slag is pulverized by a ball mill and then leached with an alkaline solution. After liquid-solid separation, an alkaline leaching solution containing W and Mo is obtained. The main components of the alkaline leach solution are: S 2- 1.5~2.2g / L, SiO 2 1.2~2.5g / L, As15~25mg / L, P7.0~30mg / L, Mo1.2~3.5g / L, WO 3 0.8~1.5g / L, NaOH20~50g / L. [0003] For the above leaching solution, methods such as sulfidation and calcium salt precipitation are generally used to recover molybdenum. Sulfide precipitation is under acidic conditions (pH = 2.5 ~ 3.0), adding Na 2 S makes Mo to form MoS 3 Precipitation; calcium salt precipitation Add soluble ...

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Problems solved by technology

[0004] In order to overcome the defects of low recovery rate and serious environmental pollution in the prior art, and realize the purpose of simultaneously recovering tungsten and molybdenum from the reverberatory slag, the technical solution provided by the present invention is a comprehensive recovery bismuth smelting reverberatory slag alkali The method for tungsten and molybdenum in the immersion liquid, the method is:

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