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进行了强碱浸出钒渣焙烧熟料实验及钒化工固体废料(脱硅渣、钒酸铁泥、二次渣)混料低碱量焙烧实验,以提高现有钒渣钠化焙烧工艺钒浸出率.结果表明,钒相被赤铁矿相(Fe_2O_3)、板钛矿相(Fe_2TiO_5)及锥辉石相[NaFe(SiO_3)_2]包裹,强碱浸出钒渣钠化焙烧熟料工艺中NaOH浓度为10 g/L时,钒浸出率高达83.15%,过滤效率提高12%;二次渣配脱硅渣后加NaOH或Na_2CO_3焙烧均可高效浸出钒,尾渣含钒仅为0.57%;混渣采用混碱(Na_2CO_3和NaOH复合添加剂)焙烧提钒,钒酸铁泥配加量在8%以下时,二次渣配钒酸铁泥加Na_2CO_3焙烧可高效浸出钒,尾渣含钒仅为0.68%.
The alkali leaching vanadium slag roasting clinker experiment and vanadium chemical solid waste (desiliconized slag, iron vanadate, secondary slag) mixture of low alkali roasting experiments to improve the existing vanadium slag sodium roasting process of vanadium leaching The results show that the vanadium phase is encapsulated by the hematite phase (Fe 2 O 3), the brookite phase (Fe 2 TiO 5) and the pyroxene phase [NaFe (SiO 3) 2] The leaching rate of vanadium is as high as 83.15% and the filtration efficiency is increased by 12% when the concentration is 10 g / L; vanadium is leached efficiently by the second slag with desiliconization slag or roasting with Na_2CO_3, the vanadium content in tailings is only 0.57%; Vanadium (Na 2 CO 3 and NaOH composite additive) roasting and extracting vanadium with vanadium slag and iron vanadate adding amount below 8%, vanadium slag is efficiently leached with secondary vanadium slag with vanadate and Na_2CO_3 roasting, vanadium contained in tailings is only 0.68%.