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| 银氧化锡合金废料电解综合回收工艺研究 |
| Study on the recovery process of silver and tin from silver tin oxide alloy scrap |
| 投稿时间：2020-11-02 |
| DOI： |
| 中文关键词: 有色金属冶金 电解 银合金废料 氧化银 综合回收 |
| 英文关键词: nonferrous metal metallurgy electrolysis silver alloy scrap silver oxide comprehensive recycling |
| 基金项目: |
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| 中文摘要: |
| 采用直流电解法和化学法回收银氧化锡(AgSnO2)合金废料中的银和锡。优化得到的电解银工艺参数为:槽电压1.5~3.0 V，电解周期为24 h，电解液中Ag+浓度为150~260 g/L，HNO3浓度为15~20 g/L，同极距120~140 mm，极板排布为六阴极五阳极间隔交替排列。一个周期银氧化锡废料电解银直收率接近95%，主体纯银粉在阴极析出。富含氧化锡的阳极泥和残极用硝酸浸出少量残余银，不溶渣还原熔炼回收锡，硝酸浸出的含银溶液中加入氢氧化钠调节pH值到10，沉淀得氧化银，500℃焙烧得到单质银。废料中的银和锡均得到有效回收。全流程银的回收率不低于99%。 |
| 英文摘要: |
| Recovery of silver and tin from AgSnO2 alloy waste by DC electrolysis and chemical method was studied. The optimized process parameters for electrolyzing silver are as follows: the cell voltage is 1.5~3.0 V, the electrolytic cycle is 24 h, the concentration of Ag+ in the electrolyte is 150~260 g/L and HNO3 is 15~20 g/L, the same pole distance is 120~140 mm, and the polar plate is arranged in an alternating arrangement with six cathodes and five anodes. The direct yield of silver in one cycle is up to 95%, and the main pure silver powder is precipitated at the cathode. A small amount of residual silver is further recovered from the anode slime and residue rich in tin oxide by leaching with nitric acid. From the leaching solution silver oxide is precipitated by adding sodium hydroxide to adjust the pH value to 10, and then roasting silver oxide at 500℃ will produce pure silver. Tin is recovered from the insoluble slag by a reduction-smelting process. In this way, silver and tin in the waste can be effectively recovered and the overall recovery rate of silver is not less than 99%. |
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