钨酸钠溶液直接水热分解制备焦绿石型氧化钨粉体的基础研究

项目名称： 钨酸钠溶液直接水热分解制备焦绿石型氧化钨粉体的基础研究

项目编号： No.51274243

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 周秋生

作者单位： 中南大学

项目金额： 71万元

中文摘要： 钨资源是我国在国际上最具优势地位的矿产资源之一，我国钨的产销量均已居世界首位。但目前我国氧化钨的提取冶金流程长、能耗高、碱（酸）消耗量大、外排盐和氨氮废水,治理难、环境污染重；同时焦绿石型氧化钨粉体在众多先进功能材料方面的应用潜力巨大，但国内外尚无直接从碱性的钨酸钠溶液制备氧化钨粉体的研究报道。因此，本项目拟重点研究：1）钨酸钠溶液的物理化学性质及其调控方法；2）钨酸钠溶液水热析出氧化钨粉体的结晶学基础；3）水热产物性质的调控方法；4）建立钨酸钠溶液直接水热析出氧化钨粉体的技术原型。本项目的研究成果将有望实现工业钨酸钠溶液直接水热析出焦绿石型氧化钨粉体，从而实现氧化钨提取冶金体系中碱的闭路循环，取消现行工业生产中中间产物-钨酸铵和仲钨酸铵的制备过程，从源头上彻底消除大量无用盐以及含氨氮废水和废气的产生，为开发新一代短流程、高效、低耗和清洁的钨提取冶金技术奠定理论基础。

中文关键词： 钨酸钠溶液；水热结晶；焦绿石型；氧化钨；生长基元

英文摘要： The tungsten-bearing resource in our country is in the most superior position in the tungsten mineral resources in the world. The separate amount of tungsten production and its consumption in China both rank the first in the world. However, The industrial prevailing extractive technology for tungsten oxide in China has still many problems such as long flowsheet, high energy consumption, high base or acid consumption and relatively serious environmental pollution,although many progresses have been achieved during the past over half century. On the other hand, pyrochlore-type tungsten trioxide powder has great potential in the application of advanced functional materials in the near future. Under these considerations, this proposal mainly investigates: 1)the physiochemical properties of sodium tungstate solution and their corresponding controlling methods, 2)the fundamental of the crystallization of tungsten trioxide hydrates from the sodium tungstate solution, 3)controlling methods for the hydrothermal precipitates; and 4) the technological prototype of the direct hydrothermal precipitation of tungsten trioxide from alkaline sodium tungstate solution. The accomplishment of this basic research may realize the direct hydrothermal precipitation of tungsten trioxide powder from the industrial sodium tungstate solutio

英文关键词： sodium tungstate solution；hydrothermal crystallization；pyrochlore-type；tungsten trioxide；growth unit