Abstract For the comprehensive utilization of antimony smelting arsenic-alkali residue, there are some problems such as the incomplete separation and low recoveries of arsenic and alkali, and the formation of arsenic-alkali mixed salts with secondary pollution. In order to solve these problems, the leaching solution of arsenic-alkali residue (arsenic-alkali solution) was used as a raw material in this study, and a novel process of twice alkali recovery with CO2, deep alkali removal with H2SO4, As(V) reduction with SO2 and evaporation concentration to recover arsenic was proposed to dispose of the arsenic-alkali solution. The total recovery of alkali was 87.8% by twice alkali recovery from the arsenic-alkali solution. After washing and thermal decomposition of crude NaHCO3, the obtained Na2CO3 product can be used as the reagent of arsenic removal in the refining process of crude antimony. In the process of deep alkali removal, compared with the direct treatment, the consumption of H2SO4 after twice alkali recovery was markedly reduced from the arsenic-alkali solution, and also no mirabilite was precipitated. The total recovery of arsenic was 80.6% in the process of arsenic recovery, and the purity of As2O3 in arsenic trioxide product reached 95.2% after washing, which meets the third grade standard of arsenic trioxide (GB 26721–2011). This process realizes the efficient separation and recovery of arsenic and alkali from the arsenic-alkali solution, and also no arsenic-alkali mixed salts are produced.

中文翻译：

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锑冶炼残渣处理过程中砷、碱产品的分离回收

摘要 锑冶炼砷碱渣的综合利用，存在砷与碱分离不完全、回收率低，形成砷碱混合盐并造成二次污染等问题。为解决这些问题，本研究以砷碱渣浸出液（砷碱溶液）为原料，采用CO2二次碱回收、H2SO4深度除碱、As( V) 提出用 SO2 还原和蒸发浓缩回收砷来处理砷碱溶液。从砷碱溶液中碱回收两次，碱的总回收率为87.8%。粗NaHCO3经洗涤和热分解后，所得Na2CO3产物可作为粗锑精炼过程中除砷的试剂。在深度除碱过程中，与直接处理相比，砷碱溶液两次碱回收后H2SO4的消耗量显着降低，且无芒硝析出。砷回收过程中砷总回收率为80.6%，洗涤后三氧化二砷产品中As2O3纯度达到95.2%，达到三氧化二砷三级标准（GB 26721-2011）。该工艺实现了砷碱溶液中砷和碱的高效分离回收，且不产生砷碱混合盐。砷碱溶液两次碱回收后H2SO4的消耗量明显减少，且无芒硝析出。砷回收过程中砷总回收率为80.6%，洗涤后三氧化二砷产品中As2O3纯度达到95.2%，达到三氧化二砷三级标准（GB 26721-2011）。该工艺实现了砷碱溶液中砷和碱的高效分离回收，且不产生砷碱混合盐。砷碱溶液两次碱回收后H2SO4的消耗量明显减少，且无芒硝析出。砷回收过程中砷总回收率为80.6%，洗涤后三氧化二砷产品中As2O3纯度达到95.2%，达到三氧化二砷三级标准（GB 26721-2011）。该工艺实现了砷碱溶液中砷和碱的高效分离回收，且不产生砷碱混合盐。符合三氧化二砷三级标准（GB 26721-2011）。该工艺实现了砷碱溶液中砷和碱的高效分离回收，且不产生砷碱混合盐。符合三氧化二砷三级标准（GB 26721-2011）。该工艺实现了砷碱溶液中砷和碱的高效分离回收，且不产生砷碱混合盐。