Treatment of Reduced Wastewater after Vanadium Precipitation with Lean Slag from Ferrovanadium Smelting
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摘要: 为回收利用钒铁冶炼的贫渣和处理还原沉钒后的废水,将钒铁冶炼过程中产生的贫渣经过风化、筛分粒度小于5 mm后获得贫渣灰,将其代替石灰粉末处理提钒过程中还原沉钒后的废水,pH值控制在7.0~8.5。结果表明:废水中每公斤铬消耗贫渣灰9.2 kg,为石灰粉末用量的1.4倍,外排废水总铬小于1.5 mg/L,总钒小于1 mg/L,SS小于70 mg/L,pH值6~9,处理后的废水符合钒工业污染物排放标准GB26452-2011排放限值。以年产钒铁(FeV50)2 000 t计,每年可减少钒铁冶炼废渣排放量3 000 t以上。Abstract: In order to recycle lean slag from ferrovanadium(FeV50) smelting and treat wastewater from vanadium precipitation,lean slag with particle sizes smaller than 5 mm instead of lime powder was used after weathering and screening to neutralize the reduced wastewater with pH value of 7.0~8.5.The results indicate that 1 kg of chromium consumes 9.2 kg of lean slag ash,1.4 times of the amount of lime powder consumed.The total chromium,total vanadium,and suspended solids in the treated wastewater are less than 1.5 mg/L,1 mg/L,and 70 mg/L respectively,and its pH value is from 6 to 9,which means the treated wastewater satisfies the standard of GB26452 -2011.In a plant with an annual output of 2 000 tons of FeV50,more than 3 000 tons of waste slag generating in FeV50 smelting can be reduced each year.
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