( 1. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室， 長沙 410083;
2. Department of Mining, Metals and Materials Engineering, McGill University, Montreal, QC H3A 2B2, Canada)
摘 要: 為了處理在冶金過程中產(chǎn)生的高鎳、砷廢液， 通常用堿中和廢液以形成砷酸鎳化合物。 采用稀釋法在pH值為7， n(Ni)∶n(As)=1.5, 反應(yīng)溫度為22 ℃， 反應(yīng)時(shí)間為2 h的條件下合成了具有較低溶解度的砷酸鎳化合物。 X射線衍射分析表明產(chǎn)物為結(jié)晶型砷酸鎳，熱重分析和化學(xué)分析得出其化學(xué)分子式為Ni3(AsO4)2·8H2O， 合成的結(jié)晶型砷酸鎳產(chǎn)物為晶粒尺寸為5～20 μm的球形顆粒。
關(guān)鍵字: 結(jié)晶型砷酸鎳；合成； 間斷法； 連續(xù)法； 稀釋
（ 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
