掺杂法制备高钠仲钨酸铵工艺研究  

Process of Preparing High-Sodium Ammonium Paratungstate by Doping Method

作　　者：张威 徐双 余春荣 胡祖辉 Zhang Wei;Xu Shuang;Yu Chunrong;Hu Zhuhui(Jiangwu H.C.Starck Tungsten Products Co.,Ltd.,Ganzhou Jiangxi 341000,China)

机构地区：[1]江钨世泰科钨品有限公司,江西赣州341000

出　　处：《硬质合金》2024年第4期316-320,共5页Cemented Carbides

摘　　要：粗晶硬质合金具有良好的热传导率和抗热疲劳性能,在矿山工具及硬面材料有较好的应用前景。作为钨制品的主要中间产品,高碱性金属含量的APT有利于生产粗颗粒碳化钨粉用于制备粗晶硬质合金。本文以钨酸铵溶液为原料,研究钨酸铵溶液中初始钠含量、掺入剂种类及掺入量、结晶率以及APT洗涤次数对APT晶体中钠含量的影响。研究结果表明:掺入剂种类对APT晶体中钠含量没影响,氢氧化钠的掺入量、结晶率及APT洗涤次数影响较大,控制钠钨质量比为4‰的氢氧化钠掺入量、结晶率为90%、APT采用纯水洗涤4次可生产出钠质量分数高于0.029%的高纳APT产品,其他杂质元素含量均优于国标零级要求。Coarse-grained cemented carbide demonstrates exceptional thermal conductivity and resistance to thermal fatigue,rendering it highly promising for applications in mining tools and hard surface materials.As the main intermediate product of tungsten,ammonium paratungstate(APT)with high-alkaline metal content facilitates the production of coarse particles of tungsten carbide powder for the preparation of coarse-grained cemented carbide.This investigation employed an ammonium tungstate solution as a raw material to explore the initial sodium content in the solution,as well as the types and quantities of additives,crystallization rate,and the influence of APT washing times on sodium content in APT crystals.The results indicate that the type of additives has no effect on the sodium content in APT crystals,but the amount of sodium hydroxide,crystallization rate,and APT washing times have a greater impact.By controlling the adding amount of sodium hydroxide at a sodium-tungsten mass ratio of 4‰and achieving a crystallization rate of 90%,high-sodium APT products with a sodium content exceeding 0.029%can be produced after four rinses with pure water.Furthermore,other impurity elements meet zero-grade requirements of national standards.

关 键 词：高钠APT 掺入量 结晶率 APT洗涤 粗晶硬质合金 

分 类 号：TG135.5[一般工业技术—材料科学与工程]