Study on Recovery of Sodium Sulfide from Solid Waste in Extraction of Vanadium
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摘要:
提钒废水浓缩后会产生大量的固体废弃物，其中含有硫酸钠和硫酸铵等物质，若处理不当，将会污染环境，并造成资源浪费。可采用煤粉还原芒硝法，即煅烧—浸取—蒸发结晶流程处理该固体废弃物。运用热力学软件对提钒后的固体废弃物回收硫化钠过程进行了理论计算。研究了还原时间、浸取温度以及浸取时间对产品产率和Na2S含量的影响。试验确定了以下优化条件：还原时间为4 h，浸取时间为6 h，浸取温度75℃。此时所得产品硫化钠含量为98.41%，产率可达97.71%。
Abstract:Solid waste from vanadium extraction contains sodium sulfate and ammonium sulfate. If not treated properly, it will pollute the environment and waste resources. The process of calcination-leaching-evaporation crystallization was designed to treat the solid waste by reducing mirabilite with pulverized coal. Thermodynamic software was used to calculate the theory of recovering sodium sulfide from solid waste of vanadium extraction. The effects of reduction time, leaching temperature and leaching time on product recovery and Na2S content were studied. The optimal conditions are determined as following reduction time at 4 h, leaching temperature in 75 ℃, leaching time with 6h. Under these conditions sodium sulfide content of the product is 98.41%, and the yield of sodium sulfide is 97.71%.
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表 1 提钒后的固体废弃物主要化学成分
Table 1. main chemical compositions of vanadium extraction solid waste
/% 成分 Na2SO4 (NH4)2SO4 H2O NH4Cl CaO K2O Fe2O3 Cr2O3 V2O5 含量 68.0 20.2 9.1 0.8 0.3 0.2 0.2 0.1 0.1 
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