提高陕西某黄金冶炼厂金浸出率的研究与实践

为提高某矿山氰化浸金率，降低尾渣金品位，提高矿粉日处理量，考察了球磨时间、液固比、浸出时间、氰化钠浓度对金浸出率的影响。结果表明，以NaOH作保护碱，在NaCN浓度0.25%，液固比1.5：1，浸出时间48 h，矿粉粒度-325目占94.17%的条件下，金的浸出率可达97.80%，尾渣金品位小于1.5 g/t。根据实验结果，对现有生产工艺流程和设备进行改造，通过改变加料方式，调整球磨机转速，增加磨矿次数、分级次数和浸出槽数目，各项生产技术指标得到明显提升。

Study and Practice of Increasing the Gold Leaching Rate of a Gold Smelter in Shaanxi

In order to increase the cyanide gold leaching rate from raw ore, and reduce the amount of gold remaining in tailing and raise mineral powder processing output, The effects of ball milling time, liquid-solid ratio, leaching time and sodium cyanide concentration on the gold leaching rate were specifically investigated. The results show that the gold leaching rate is up to as high as 97.80%, and the remaining gold in tailing is less than 1.5 g/t from raw ore powder with a particle size of -325 mesh accounting for 94.17%, under the conditions of 0.25% NaCN concentration, 1.5/1 liquid to solid ratio and 48 h leaching time. According to the results, some improvements were carried on for the existing production process and equipment to guarantee a high gold leaching rate. These mainly included the change of the feeding mode, adjustment of the rotational speed during boll milling, increase of the grinding numbers as well as the augment of classification and leaching tanks, so the production technical indicators are improved significantly.