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大型堆浸循环液深度除钙试验研究
- 作者：
白杨
- 作者单位：
- 内蒙古太平矿业有限公司
基金项目：
- 国家重点研发计划项目（2023YFC2907803）
详细信息：
- 作者简介：
- 白杨（1992—），男，工程师，从事黄金选矿及科研管理工作；E?mail：byang@chinagoldintl. com
- PDF下载
Experimental study on deep calcium removal from large‑scale heap leaching circulating solution
- English Author：
Bai Yang
- Unit：
- （Inner Mongolia Pacific Mining Co., Ltd.）
- 摘要
- 在线预览
- 参考文献
摘要:
针对某黄金矿山在长期堆浸生产过程中存在钙、镁等贱金属阳离子积累而影响生产效率和质量的问题，提出了贫液二氧化碳初步除钙与贵液阻垢剂深度除钙联合技术方案。通过试验确定了最佳工艺参数：贫液pH值调整至11.5～12.0，二氧化碳充气压力控制在0.25 MPa，反应时间设定为 1.5 h，贫液二氧化碳初步除钙效率可稳定达到 90 %以上；向贵液中添加优选的 DN3 阻垢剂，在添加量900 mg/L条件下，载金炭钙吸附量减少了1.76 百分点，金吸附率提高了13.38 百分点，酸洗再生成本显著降低。连续试验结果表明，采用该联合技术可降低钙、镁离子的影响，提高金的吸附效果，对改善生产工艺具有重要意义。
关键词:
堆浸循环液；二氧化碳除钙；阻垢剂；吸附增强；黄金选冶；活性炭
Abstract:
In response to the accumulation of base metal cations such as calcium and magnesium during long-term heap leaching operations at a gold mine, which negatively affects production efficiency and quality, a combined technical scheme was proposed involving preliminary calcium removal from barren solution using carbon dioxide and deep calcium removal from pregnant solution using a scale inhibitor. Experimental results determined the optimal process parameters: adjusting the pH of the barren solution to 11.5-12.0, maintaining the carbon dioxide injection pressure at 0.25 MPa, and setting the reaction time to 1.5 h. Under these conditions, the preliminary calcium removal efficiency from the bar-ren solution can stably exceed 90 %. By adding the optimized DN3 scale inhibitor to the pregnant solution at a dosage of 900 mg/L, the calcium adsorption on gold-loaded carbon was reduced by 1.76 percentage points, while the gold adsorp-tion rate increased by 13.38 percentage points, and the cost of acid washing regeneration was significantly reduced. Continu-ous testing demonstrated that this combined technique effectively reduces the impact of calcium and magnesium ions, enhances gold adsorption, and plays a significant role in improving the production process.
Keywords:
heap leaching circulating solution; calcium removal by carbon dioxide; scale inhibitor; adsorption enhancement; gold metallurgy; activated carbon
