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针对高铬钒渣氧化钠化焙烧—水浸提钒铬工艺获得钒铬液的特点,解决常规铵盐沉钒工艺产生高Na~+、高NH_4~+废水难处理的问题,选用水热法水解沉钒技术从高铬高钠的钒液中高效分离提取出钒,为后续提铬及废水处理创造了有利条件。分别研究了水解沉钒温度、pH值和反应时间与沉钒率和铬损失率的关系,结果表明:在反应pH值1.8,温度120℃,反应时间180 min的条件下可获得接近90%的沉钒率,水解产物经打浆洗涤—煅烧后即制得满足98粉钒标准(YB/T 5304—2011)要求的氧化钒产品。
According to the characteristics of vanadium chromium liquid obtained by high chromium and vanadium slag sodium oxide roasting and water leaching of vanadium and chromium, the problem of difficult treatment of high Na ~ + and high NH_4 ~ + wastewater by conventional ammonium salt vanadium precipitation process is solved, hydrothermal method Hydrolysis vanadium precipitation technology vanadium from high-chromium high-sodium vanadium extract and extract the vanadium for the follow-up to raise chromium and wastewater treatment has created favorable conditions. The relationship between temperature, pH value and reaction time of vanadium precipitation and vanadium deposition rate and chromium loss rate was studied respectively. The results showed that nearly 90% of vanadium was obtained under reaction conditions of pH 1.8, temperature 120 ℃ and reaction time 180 min Shen vanadium rate, the hydrolyzate washed by beating - calcined to obtain 98 Vanadium oxide standard (YB / T 5304-2011) requirements of vanadium oxide products.