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研究了(NH4)2SO4-Na2SO4混合盐用于酸性铵盐沉钒的可行性,研究结果表明,w Na2SO4/w(NH4)2SO4≤0.3时,沉钒率为98.9%~99.3%,沉淀物(APV)洗涤后,TV 49.85%~50.43%、Na2O 0.11%~0.51%、S 0.100%~0.448%,K2O 0.11%~0.12%,混合盐中Na2SO4含量未对沉钒过程及沉淀物成分造成显著影响。采用SEM、EDS分析沉淀物,推测Na+、SO42-以表面吸附的方式存在于沉淀物表面,K+可能作为晶核或构晶离子生成混合晶体存在于沉淀物中。废水蒸发浓缩结晶残液制备的(NH4)2SO4-Na2SO4混合盐酸性沉钒试验结果表明,沉淀物经洗涤后可满足生产要求,试验结果验证了用废水蒸发浓缩结晶残液制备的混合盐用于酸性铵盐沉钒的可行性。
The feasibility of vanadium (NH4) 2SO4-Na2SO4 mixed salt for acid ammonium precipitation was studied. The results show that the vanadium precipitation rate is 98.9% -99.3% when w Na2SO4 / w (NH4) 2SO4≤0.3, APV), TV 49.85% -50.43%, Na2O 0.11% -0.51%, S 0.100% -0.448%, K2O 0.11% -0.12%. The content of Na2SO4 in mixed salt had no significant effect on vanadium precipitation and sediment composition . The precipitates were analyzed by SEM and EDS. It is speculated that Na + and SO42- exist on the surface of the precipitate by surface adsorption, and K + may exist in the precipitate as crystal nuclei or mixed crystals of the crystal ions. The results show that the precipitate can be washed to meet the production requirements. The experimental results verify that the mixed salt prepared by evaporating and condensing the crystallization residue from the waste water can be used to prepare the (NH4) 2SO4-Na2SO4 mixed hydrochloric acid solution Feasibility of acid ammonium salt sinking vanadium.