摘要
基于氧化铁与硫酸反应的热力学原理,采用硫酸熟化-水浸法对高硫高砷金精矿氧化焙砂进行预处理,以脱除铁氧化物,破坏其对金的包裹,提高金浸出率。结果表明,在适宜的硫酸含量下,赤铁矿与硫酸反应的产物硫酸铁可转化为板铁矾HFe(SO4)2·4H2O晶体,降低了产物浓度,从而使赤铁矿继续溶解,提高了铁脱除率;适当升高温度可促进扩散的进行,从而使铁的脱除更加彻底。焙砂的氰化浸金率在脱除铁氧化物后显著提高。对于某铁含量为31.25%(质量分数)金含量为84.27 g/t的焙砂,当熟化条件为硫酸含量75%、硫酸过剩系数1.4、熟化温度250℃、熟化时间1 h时,焙砂中残余铁含量降至7.23%,此时金浸出率可达97.51%。
Based on thermodynamics between iron oxides and sulfuric acid, a pretreatment process of sulfuric acid-curing and leaching was used to remove iron, release packaged gold and enhance gold leaching rate. The results show that the product of hematite and sulfuric acid, ferric sulfate, converts to rhomboclase HFe（SO 4 ） 2 ·4H 2 O under a suitable H 2 SO 4 acidity, which can lessen the product concentration, continue the hematite dissolution and improve the iron removal rate. A reasonably higher temperature during curing process leads to a higher iron removal rate. The pretreatment works effectively. For calcine containing Fe of 31.25%（mass fraction） and Au of 84.27 g/t, the gold leaching rate reaches 97.51% and the residual iron in calcine is reduced to 7.23% after a pretreatment of sulfuric acid content 75%, excess coefficient of sulfuric acid 1.4, curing temperature 250℃and curing time 1 h.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2014年第9期2380-2386,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51074182)
关键词
高硫砷金矿
焙砂
硫酸熟化
浸金
除铁
gold ores with high sulfur and arsenic
calcine
sulfuric acid-curing
gold leaching
iron removal
