石硫合剂对金精矿浸出特性的影响

Effects of lime sulphur synthetic solution on leaching characteristic of gold concentrates

采用石硫合剂法对金精矿进行浸出,考察硫黄、水与石灰质量比和合成时间对硫的转化率、母液p H值及金浸出效果的影响,通过XRD分析了渣的主要成分,揭示硫的转化途径。结果表明:在硫黄、石灰和H2O质量比为2:1:(50~75)和时间为45 min的条件下,可得到硫转化率为97.57%,p H值为10.5的石硫合剂;石硫合剂稀释浓度为15%时,金的浸出率达到73.42%;硫黄与石灰的质量比是影响硫转化率和p H值的主要因素,随质量比的增加,硫的转化率和p H值逐步降低;水与石灰的质量比和合成时间对p H值影响较大,而对硫的转化率几乎没有影响;硫在石硫合剂合成过程中主要进入溶液,只有少量的硫以单质的形式残留在合成渣中,渣中残留的硫随硫黄与石灰质量比的增加而增多。

Lime sulphur synthetic solution(LSSS) method was applied in gold concentrates leaching. The effect of mass ratio of sulphur, lime and water and synthetic time on sulfur conversion rate and p H value in synthetic process and gold leaching rate were investigated. X-ray diffraction was used to detect the main component of the residue aiming to uncover the transformation way of sulphur in LSSS synthetic process. The results show that the lime sulphur synthetic solution with sulfur conversion rate of 97.57% and p H of 10.5 is obtained when the synthesis conditions for mass ratio of sulphur, lime and water of 2:1:(50-75) and the time of 45 min. When the dilute concentration is 15%, the gold leaching rate reaches 73.42%. The mass ratio of sulfur to lime is the main reason affecting the sulfur conversion and p H value of mother solution. Both of sulfur conversion rate and p H value of mother solution show a declining tendency with the increase of the mass ratio of sulfur to lime. The mass ratio of water to lime and synthetic time has great effects on the p H value of mother solution, and has no effect on sulfur conversion rate. After LSSS preparation, sulfur mainly transfers into solution, a small amount of sulfur exists in the form of elemental sulfur in the residue, and the amount of this elemental sulfur increases with increasing the mass ratio of sulfur to lime.