( 1. 中南大学 粉末冶金国家重点实验室， 长沙 410083;
2. Department of Mining, Metals and Materials Engineering, McGill University, Montreal, QC H3A 2B2, Canada)
摘 要: 为了处理在冶金过程中产生的高镍、砷废液， 通常用碱中和废液以形成砷酸镍化合物。 采用稀释法在pH值为7， n(Ni)∶n(As)=1.5, 反应温度为22 ℃， 反应时间为2 h的条件下合成了具有较低溶解度的砷酸镍化合物。 X射线衍射分析表明产物为结晶型砷酸镍，热重分析和化学分析得出其化学分子式为Ni3(AsO4)2·8H2O， 合成的结晶型砷酸镍产物为晶粒尺寸为5～20 μm的球形颗粒。
关键字: 结晶型砷酸镍；合成； 间断法； 连续法； 稀释
（ 1. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China;
2. Department of Mining, Metals and Materials Engineering,
McGill University, Montreal, QC H3A 2B2, Canada）
Abstract: Both crystalline and amorphous nickel arsenate compounds may form in the alkaline neutralized waste water containing high concentration of nickel(Ⅱ) and arsenic(Ⅴ). The low solubility crystalline annabergite is synthesized by diluting under the conditions of n(Ni)/n(As)=1.5, pH=7 and θ=22 ℃ for 2 h. The results show that the composite is Ni3(AsO4)2·8H2O through TGA and chemical analysis, and the crystalline annabergite is spherical grain with size of 5-20 μm.
Key words: crystalline annabergite; synthesis; step-wise process; continuous process; diluting
