煅烧条件对锌氧粉中锑浸出特性的影响

针对锌厂锌氧粉中锑浸出的不稳定性,研究了煅烧前后锌氧粉中锑的水浸行为.以粒径小于0.074 mm的锌氧粉为研究对象,采用煅烧预处理-蒸馏水浸出的方法,考察了煅烧温度、煅烧时间和二氧化锰粉用量对锌氧粉中锑浸出特性的影响,得到了优化的反应条件.研究结果表明,在相同水浸条件下,获得最优锑浸出特性的煅烧条件为煅烧温度800℃,煅烧时间8 h和二氧化锰粉/锌氧粉质量比10%.在该实验条件下,煅烧预处理的锌氧粉经水浸出后,水浸液中锑含量小于0.7 mg/L.

硫化锑矿碱浸过程中部分参数对锑浸出率影响的研究

根据实验室模拟小试数据,探讨分析在碱浸电积提锑工艺中浸出工段片碱使用量、液固比、硫化钠用量倍数等各项参数对锑浸出率的影响,确定了合适的参数,取得了良好的效果。

含锑金精矿碱性硫化钠浸出锑研究与工业实践

为了回收含锑金精矿中的锑,减少锑对两段焙烧过程的影响,对浮选富集得到的含锑金精矿进行硫化钠碱性浸出锑研究。优化实验表明,在液固比1.5:1 (mL/g),氢氧化钠用量20 g/L,硫化钠用量40 g/L,反应温度80℃,浸出30 min,锑浸出率可达98%以上。在此基础上,采用焙烧炉余热将电解贫液加温至80℃,对液固分离方式、锑电积阴阳极板和冷冻结晶装置进行工艺改造,使锑的浸出率>98%、阴极锑纯度>95%,日产锑量增加17.35%。

辉锑矿碱性体系浸出锑的试验研究

针对国内某辉锑矿进行碱性硫化钠体系法浸出锑的研究,通过改变Na_2S浓度、NaOH浓度、浸出时间、浸出温度、液固比进行条件试验。确定出经济可行的浸出条件:当硫化钠过量系数为1、Na_2S浓度与NaOH浓度比6:4、浸出时间30 min、浸出温度50℃、液固比4∶1条件下进行浸出时,锑的浸出率达到96.19%。当温度达到90℃时,锑的浸出率能达到99.54%。

锡冶炼烟尘中锡锑分离新工艺研究

采用还原焙烧-硫化钠浸出工艺解决了锑回收的问题。富锑烟尘先进行焙烧,焙烧渣经硫化钠浸出,锑的浸出率>90%,锡的浸出率<1%,锡锑分离效果较好。

高锑铜阳极泥湿法处理研究及应用

介绍了恒邦股份公司采用回转窑焙烧处理高锑铜阳极泥新工艺。通过对影响金银回收的多因素进行综合研究分析,解决固液分离效果差,金、银直收率低,板框滤布板结严重,工作效能低等问题,经实验研究,现已成功应用于生产。实践证明,采用新工艺增加锑浸出脱除工序能够大幅度提高分金、分银工作效能,提高金银直收率。

Selective removal of As from arsenic-bearing dust rich in Pb and Sb

The selective removal of arsenic from arsenic-bearing dust containing Pb and Sb in alkaline solution was studied. The influence of Na OH concentration, temperature, leaching time, liquid to solid ratio, and the presence of elemental sulfur on the dissolution of As, Sb and Pb in Na OH solution was investigated. The results indicate that the presence of elemental sulfur can effectively prevent leaching of lead and antimony from arsenic. The Sb2O3, As2O3 and Pb5(AsO4)3 OH in the raw material convert to NaSb(OH)6 and PbS in the leaching residue, while arsenic is leached out as As(Ⅲ) or As(Ⅴ) ions in the leaching solution. Arsenic leaching efficiency of 99.84% can be achieved under the optimized conditions, while 97.82% of Sb and 99.97% of Pb remain in the leach residue with the arsenic concentration of less than 0.1%. A novel route is presented for the selective removal of arsenic and potential recycle of lead and antimony from the arsenic-bearing dust leached by Na OH solutions with the addition of elemental sulfur.

Sodium sulfide leaching of low-grade jamesonite concentrate in production of sodium pyroantimoniate

Sodium sulfide leaching of a low-grade jamesonite concentrate in the production of sodium pyroantimoniate through the air oxidation process and the influencing factors on the leaching rate of antimony were investigated. In order to decrease the consumption of sodium sulfide and increase the concentration of antimony in the leaching solution, two-stage leaching of jamesonite concentrate and combination leaching of high-grade stibnite concentrate and jamesonite concentrate were used. The experimental results show that the consumptions of sodium sulfide for the two-stage leaching process and the combination leaching process are decreased by 20% and 60% compared to those of one-stage leaching process respectively. The final concentrations of antimony in the leaching solutions of both processes are above 100g/L.

Behavior of silver and lead in selective chlorination leaching process of gold-antimony alloy

The behavior of silver and lead in the selective chlorination leaching process of gold-antimony alloy was analyzed in detail and appropriate recovery methods were developed.A reduction method by adding gold-antimony alloy powder was adopted to recover silver according to the thermodynamics calculation.The reducing rate of silver can exceed 99%at 80℃for 1.5 h when the dosage of gold-antimony alloy powder is 10%.The dissolution equilibrium curved surfaces of PbSO4 and PbCl2 under different conditions were drawn.The experimental results are well consistent with theoretical analysis that indicate lead may be precipitated in the form of lead chloride.The grade of gold in the residue can be further concentrated to 94.5%after being washed with hot water. These two methods have been applied successfully in the practice.

Leaching kinetics of antimony-bearing complex sulfides ore in hydrochloric acid solution with ozone

The leaching kinetics of Sb and Fe from antimony-bearing complex sulfides ore was investigated in HCl solution by oxidation?leaching with ozone.The effects of temperature,HCl concentration,stirring speed and particle size on the process were explored.It is found that the recoveries of Sb and Fe reach86.1%and28.8%,respectively,when the reaction conditions are4.0mol/L HCl,900r/min stirring speed at85°C with<0.074mm particle size after50min leaching.XRD analysis indicates that no new solid product forms in the leaching residue and the leaching process can be described by shrinking core model.The leaching of Sb corresponds to diffusion-controlled model at low temperature(15?45°C)and mixed-controlled model at high temperature(45?85°C),and the apparent activation energies are6.91and17.93kJ/mol,respectively.The leaching of Fe corresponds to diffusion-controlled model,and the apparent activation energy is1.99kJ/mol.Three semi-empirical rate equations are obtained to describe the leaching process.