多序列非团聚二钼酸铵生产工艺研究

Study on production technology of multi-sequence non-agglomerated ammonium dimolybdate

为满足高端钼材对优质钼原材料的重大需求,本文提出制备多序列非团聚二钼酸铵的关键调控过程与生产工艺,通过试验与产物结构表征,对结晶过程各参数的影响与调控进行系统性研究。结果表明,溶液初始钼浓度的调控与分散剂的加入有利于溶液过饱和度稳定在非自发形核的介稳区,避免团聚而生产粒度较大、粒度分布窄的非团聚型二钼酸铵;晶体的尺寸与粒度分布受晶体生长周期长短的影响,较大的搅拌速度能够促进晶粒的生长速率。本研究成功开发出多序列形貌粒度均匀且分布窄非团聚二钼酸铵产品,实现工业化生产,该产品粒度D50在80~130μm、100~140μm、140~180μm、220~280μm、280~380μm多个粒度区间,可有效满足国内外对不同规格二钼酸铵产品的需求,为我国高端钼材的生产和开发奠定良好的基础。

In order to meet the major demand of high-quality molybdenum raw materials in advanced Mo-materials,the production process and key factors of the preparation of multi-sequence non-agglomerated ammonium dimolybdate were proposed in this paper.Through experiments and structure characterization,the influence and control trend of various parameters in the crystallization process were discussed in details.As results,the regulation of the initial Mo concentration of the solution and the addition of the dispersant are beneficial to the stability of the supersaturation of the solution in the metastable zone of non-spontaneous nucleation,avoiding agglomeration and producing non-agglomerated ammonium dimolybdate with large particle size and narrow particle size distribution.The length of the crystal growth period determines the particle size and size distribution of the crystal,and the larger stirring speed promotes the growth of crystal.A series of non-agglomerated ammonium dimolybdate products with uniform morphology and narrow particle size distribution have been successfully developed in the industry.The particle size D50 are 80~130μm,100~140μm,140~180μm,220~280μm,280~380μm,respectively.It can effectively meet the strategic demand for ammonium dimolybdate products of different specifications at home and abroad.This technical achievement fills the domestic gap and leads the sales volume,that is laying a good foundation for the production and development of high-end molybdenum materials in China.