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采用W_A,W_C两种离子交换树脂和吸附工艺,可从粗钨酸钠溶液中制备高纯仲钨酸铵,此法对磷、砷、硅、钼、锡等杂质均有较好的净化效果,所生产的产品可达一级品国家标准,且产品外形美观粒度均匀。此法首先采用多孔阴离子交换树脂从碱性钨酸钠溶液中吸附钨,解吸液再用丙烯酸型阴离子交换树脂吸附,用氨水解吸,解吸液中的钨浓度高达250克以上/升,蒸发结晶得高纯仲钨酸铵,该法具有以下优越性:1.适应性广可适用于黑钨精矿碱煮液;白钨碱矿煮液,钨中矿、钨细泥碱煮液。2.钨的回收率达99％以上;3.生产成本低、劳动条件好且无污染;4.有机材料消耗少;5.新型吸附钨的树脂,在钨酸钠溶液中
Using W_A, W_C two kinds of ion exchange resin and adsorption process, high purity ammonium paratungstate can be prepared from crude sodium tungstate solution, this method has good purification effect on phosphorus, arsenic, silicon, molybdenum, tin and other impurities. The products up to a national standard products, and the appearance of the product particle size uniformity. In this method, firstly, porous anion exchange resin is used to adsorb tungsten from alkali sodium tungstate solution, and then the desorption solution is adsorbed by acrylic anion exchange resin and desorbed by ammonia water, the concentration of tungsten in the desorption solution reaches as high as 250 g / l or more, High-purity ammonium paratungstate, the method has the following advantages: 1. Wide adaptability is suitable for wolframite alkali cooking liquid; white tungsten alkali mineral cooking liquid, tungsten ore, tungsten fine mud alkali cooking liquid. 2. Tungsten recovery rate of 99% or more; 3. Low production costs, good working conditions and pollution-free; 4. Less consumption of organic materials; 5. A new tungsten adsorption resin, sodium tungstate solution