复杂金精矿焙砂酸浸氰化工艺研究及金银物相演变规律
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摘要
研究了复杂金精矿焙砂酸浸—氰化工艺酸浸分铜工序铜浸出率,以及后续氰化过程金、银浸出率的影响。结果表明:在浸出温度363K、浸出时间3h、硫酸浓度1.0mol/L、搅拌转速300r/min、液固比4∶1的较优条件下,金、银、铜的浸出率分别为93.21%、83.25%、95.57%。硅酸盐包裹是造成银浸出率低的主要原因。无添加剂直接焙烧,氰化渣中硅酸盐包裹银占渣含银总量的60.30%;在焙烧过程中添加氢氧化钠可以有效降低硅酸盐对银的包裹,有效提高银的浸出率,氰化渣中硅酸盐包裹银仅占渣含银总量的27.56%。
Copper leaching rate of acid leaching-cyanide process in complex gold concentrate calcine acid leaching-cyanide process and leaching rates of gold and silver in subsequent cyanidation process were studied.The results show that leaching rates of gold,silver and copper are 93.21%,83.25%,and95.57% separately under the optimum leaching conditions including leaching temperature of 363 K,leaching time of 3 h,sulfuric acid concentration of 1.0 mol/L,stirring speed of 300 r/min,and L/S=4/1.Silicate inclusion is the main cause of low silver leaching rate.Content of silver silicate inclusions is60.30% of total amount of silver in cyanide residue without additives in roasting process.Sodium hydroxide addition in roasting process can effectively reduce probability of silver silicate inclusion and improve silver leaching rate.Content of silver silicate inclusion is only 27.56%of total amount of silver in cyanide residue in sodium hydroxide roasting process.
Copper leaching rate of acid leaching-cyanide process in complex gold concentrate calcine acid leaching-cyanide process and leaching rates of gold and silver in subsequent cyanidation process were studied.The results show that leaching rates of gold,silver and copper are 93.21%,83.25%,and95.57% separately under the optimum leaching conditions including leaching temperature of 363 K,leaching time of 3 h,sulfuric acid concentration of 1.0 mol/L,stirring speed of 300 r/min,and L/S=4/1.Silicate inclusion is the main cause of low silver leaching rate.Content of silver silicate inclusions is60.30% of total amount of silver in cyanide residue without additives in roasting process.Sodium hydroxide addition in roasting process can effectively reduce probability of silver silicate inclusion and improve silver leaching rate.Content of silver silicate inclusion is only 27.56%of total amount of silver in cyanide residue in sodium hydroxide roasting process.
引文
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[13]曾斌.多金属复杂金精矿综合回收金银铜工艺研究[D].江西赣州:江西理工大学,2014.
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[2]徐忠敏,翁占平,国洪柱.复杂难处理金精矿加压氧化预处理工艺试验研究[J].黄金,2017,38(2):54-57.
[3]夏光祥,段东平,周娥,等.含砷难处理金精矿的催化氧化酸浸(COAL)新工艺开发[J].黄金科学技术,2013,21(5):113-116.
[4]徐盛明,池汝安,徐景明,等.银精矿加石灰焙烧过程中银的化学物相变化[J].中国有色金属学报,2001,11(4):726-729.
[5]董岁明,周春娟.新疆某高硫高砷金精矿的预处理氰化浸金试验研究[J].黄金,2011,32(5):42-44.
[6]龚喜林.某含砷金精矿加氯化剂氧化焙烧探索试验[J].黄金,2008,29(6):49-51.
[7]薛光,唐宝勤,于永江.含砷金精矿焙烧—氰化浸取金、银的试验研究[J].黄金,2007,28(7):38-39.
[8]孟宇群,王隆保.低温低氧势焙烧预处理难浸金矿[J].有色金属,2001,53(4):29-32.
[9]衷水平.含银难处理金精矿焙烧过程添加剂的研究及应用[J].有色金属(冶炼部分),2016(1):25-29.
[10]刘志强,黄清源,朱薇,等.某含金银褐铁矿预处理工艺对氰化浸出的影响[J].稀有金属,2016,37(7):708-714.
[11]崔毅琦,孟奇,童雄,等.氰化浸金过程中孔雀石反应的热力学[J].稀有金属,2015,36(7):637-642.
[12]王瑞祥,曾斌,余攀,等.含多金属复杂金精矿焙烧预处理—提取金、银、铜研究[J].稀有金属,2014,35(1):86-92.
[13]曾斌.多金属复杂金精矿综合回收金银铜工艺研究[D].江西赣州:江西理工大学,2014.
[14]薛光.加氢氧化钠提高焙烧—氰化法银浸出率的试验研究[J].有色冶炼,2002(5):19-21.