微细粒含砷难处理金矿石提金工艺研究

针对某微细粒含砷难处理金矿石性质,进行了金回收工艺试验研究。矿石中金品位4.14 g/t,砷品位1.80%,金属矿物以赤褐铁矿、毒砂为主。矿石中金的粒度较细,以显微金为主,约占矿石中金的66.67%。通过对单一浮选、浮选—氰化浸出、全泥氰化浸出等工艺流程进行探索试验表明:采用浮选—氰化浸出流程处理该矿石,金总回收率达84.82%,但金精矿中砷含量超标,可采用冶金方法进行后续金精矿降砷试验;采用原矿全泥氰化浸出流程,金回收率73.61%,浸渣中砷质量分数1.71%左右,指标相对较好。

某石英脉型微细粒嵌布低品位金矿石选矿试验

为了给某石英脉型微细粒嵌布低品位金矿石的开发利用提供依据,根据矿石性质,采用浮选—浮选尾矿氰化浸出—浮选精矿焙烧后氰化浸出工艺流程进行了选矿试验。结果表明:浮选—尾矿氰化浸出可获得金品位为61.88 g/t、砷含量为4.21%、金回收率为77.57%的金精矿和作业金浸出率为75.85%、对原矿金回收率为17.02%的尾矿浸出液,两者的金回收率合计达到94.59%。金精矿经焙烧预处理,焙砂砷含量降到0.38%、金品位提高到88.40 g/t;焙砂氰化浸出的作业金浸出率达93.28%、对原矿金回收率为72.36%,金精矿焙砂和浮选尾矿氰化浸出的综合金回收率为89.38%。

国外某难选金铜矿综合回收选矿试验研究

国外某难选含砷金铜矿采用浮选—氰化联合选别工艺,组合抑制剂抑砷,综合回收了矿石中的铜和金。浮选优先获取了可以直接销售的含砷合格铜金精矿,浮选尾矿氰化浸金补充回收了残留在其中的金,使铜、金综合回收率分别达到了78.73%和94.50%。

变废为宝开发金矿二次资源

变废为宝开发金矿二次资源王志江矿产资源的开采，不可避免地产出大量工业废渣──尾矿，特别是黄金矿山，尾矿的排放量之大，几乎等于入选矿石量。工业发达国家已把无尾（无废料）矿山作为矿山的开发目标，而且尾矿的综合利用程度已成了衡量一个国家科学技术水平和经济发...

Mechanism of sodium sulfide on flotation of cyanide-depressed pyrite

The mechanism of sodium sulfide(Na2S)on the flotation of cyanide-depressed pyrite using potassium amyl xanthate(PAX)as collector was investigated by flotation test and electrochemical measurements.The flotation results show that both PAX and Na2S can promote the flotation recovery of cyanide-depressed pyrite and their combination can further improve the pyrite flotation recovery.Electrochemical measurements show that PAX and Na2S interacted with cyanide-depressed pyrite through different mechanisms.PAX competed with cyanide and was adsorbed on the pyrite surface in the form of dixanthogen,thus enhancing the hydrophobicity and flotation of cyanide-depressed pyrite.Unlike PAX,Na2S rendered the pyrite surface hydrophobic through the reduction of ferricyanide species and the formation of elemental sulfur S0 and polysulfide Sn2-.The combined application of PAX and Na2S induced superior pyrite flotation recovery because of a synergistic effect between PAX and Na2S.

Flotation behaviors and mechanisms of chalcopyrite and galena after cyanide treatment

Adsorbing tests between CN? and chalcopyrite or galena were conducted firstly, and then flotation tests of the twocyaniding minerals were investigated in butyl xanthate (BX) system. Results showed that the interaction between CN? and the twomineral surfaces were both chemical adsorption and can be described by the Langmuir adsorption isotherm model. In the optimumcondition of pH 6.5 and 4.0 mg/L BX, the recovery of cyaniding chalcopyrite and galena reached 82.1% and 63.9%, respectively. BXimproved the hydrophobicity of the surfaces of the two minerals, although CN? reduced the contact angle on the surface of minerals.The inhibitory effect of CN? on chalcopyrite far outweighed galena. Electrostatic adsorption exists in the interaction between BX andthe surface of galena after cyanide treatment in the pH range of 4.2?8.4, while the interactions between BX and the surface ofchalcopyrite after cyanide treatment is chemical adsorption.

Improved recovery of a low-grade refractory gold ore using flotation–preoxidation–cyanidation methods

In this work, different flotation–preoxidation–cyanidation methods are considered for treating a lowgrade refractory gold ore. On the one hand, the results of selective flotation show that 22% and 31.1%of total Sb and As, respectively, remained in the final tailings and only about 28% of the total Au remained for further cyanidation processes. On the other hand, in bulk method of flotation the maximum Au recovery of 90.6% achieved after 60 min of flotation at the grind size with K80 of 146 micron. In addition, the bulk flotation method resulted in the concentrate with low concentrations of Sb and As elements. To improve the recovery of low-grade refractory gold ores, flotation should be followed by roasting, biological, or pressure oxidation processes so that the gold could be liberated prior to cyanidation processes. It is also found that the pressure oxidation pre-treatment of the concentrates prior to cyanidation may yield high gold recoveries of over than 83%. In these processes, recoveries are controlled by the temperature and the oxygen partial pressure in the solvent. However, by utilizing the bio-oxidation technique, the oxidation of sulfur to sulfate cannot be completed and, consequently, the gold recovery may be limited to only 72.2%.