高砷硫铁矿高效分离硫砷

云南某选矿厂铜硫分离后的陶瓷过滤机尾矿为高砷硫铁矿。化学分析表明,矿样中含硫27.32%,有毒元素砷含量高达4.85%。X射线衍射、电子探针和能谱分析表明,矿样中主要硫化矿物为黄铁矿,其次为磁黄铁矿和毒砂,主要脉石矿物为白云石、石英等,黄铁矿和毒砂基本单体解离。根据高砷硫铁矿性质,采取“先浮后磁”的工艺对高砷硫铁矿进行选别,以大分子有机弱酸盐为主的高效药剂(YX-SY1)作为毒砂的抑制剂,通过“浮硫抑砷”的浮选流程分离黄铁矿与毒砂,得到的浮选精矿硫品位为48.11%、硫回收率为42.94%、含砷0.35%;然后根据磁黄铁矿具有磁性这一性质将浮选尾矿给入高梯度磁选机进行选别,得到硫品位37.59%、硫回收率25.32%、含砷0.58%的磁选精矿,而磁选尾矿硫品位为15.66%、含砷7.89%,其中砷的回收率高达95.79%,实现了高砷硫铁矿中硫砷元素的高效分离。

含砷硫铁矿吸收微波特性研究

采用量热法测试砷硫铁矿在不同的微波输出功率、物料质量、颗粒粒度、辐射时间等条件下,吸收微波能量的情况。试验结果表明,物料吸收微波能随着功率、时间、质量增大而增大。粗粒级吸收微波能量大于细粒级。

含砷硫铁矿焙烧过程的热力学分析

对含砷硫铁矿焙烧过程的热力学分析，绘出焙烧曲线，找出脱硫脱砷焙烧的理想条件，并对ＢＡＳＦ和Ｂｏｌｉｄｅｎ两种脱砷方法进行了讨论。

含砷硫铁矿制硫酸的危害及其防止

介绍硫酸生产对原料硫铁矿含砷量的要求，论述制酸过程中的砷行为及其危害性，指出如何治理含砷污水和酸泥，如何防止含砷硫铁矿对制酸的危害。

氯化法处理高砷硫铁矿烧渣的研究

本文研究了高温氯比法处理广西大厂高砷硫铁矿烧渣的技术,使高砷烧渣在脱除有色金属的同时除去砷,达到炼铁原料要求,为广西大厂高砷硫铁矿的综合利用提出了一条可供选择的途径。

Effect of arsenopyrite on thiosulfate leaching of gold

Arsenopyrite was artificially added into the thiosulfate leaching solution to clarify the role of arsenopyrite on the thiosulfate leaching of gold.The effect of arsenopyrite on the thiosulfate leaching of gold was studied by the thermodynamic calculation,mineral dissolution test,leaching test and XPS analysis.The results show that the thiosulfate consumption slightly increases with increasing the concentration of arsenopyrite,but the gold dissolution is obviously hindered.This may mainly attribute to the catalytic effect of arsenopyrite on the thiosulfate decomposition and the formation of passivation layer on the gold foil surface.The passivation layer likely consists of Cu2S or Cu（S2O3）35-,element S,FeOOH and iron arsenate,which is deduced from the XPS analysis.However,the negative effect of arsenopyrite can be eliminated by adding additives.It is found that both additives of sodium carboxymethyl（CMC） and sodium phosphate（SHPP） can not only decrease the thiosulfate consumption but also improve the gold dissolution.

Mobility of Arsenic and Heavy Metals in a Sandy-Loam Textured and Carbonated Soil

The continued effect of the pyrite-tailing oxidation on the mobility of arsenic, lead, zinc, cadmium, and copper was studied in a carbonated soil under natural conditions, with the experimental plot preserved with a layer of tailing covering the soil during three years. The experimental area is located in Southern Spain and was affected by a pyrite-mine spill. The climate in the area is typically Mediterranean, which determines the rate of soil alteration and element mobility. The intense alteration processes that occurred in the soil during three years caused important changes in its morphology and a strong degradation of the main soil properties. In this period, lead concentrated in the first 5 mm of the soil, with concentrations higher than 1500 mg kg?1, mainly associated to the neoformation of plumbojarosite. Arsenic was partially leached from the first 5 mm and mainly concentrated between 5–10 mm in the soil, with maximum values of 1239 mg kg-1; the retention of arsenates was related to the neoformation of iron hydroxysulfates (jarosite, schwertmannite) and oxyhydroxides (goethite, ferrihydrite), both with a variable degree of crystallinity. The mobility of Zn, Cd, and Cu was highly affected by pH, producing a stronger leaching in depth; their retention was related to the forms of precipitated aluminium and, in the case of Cu, also to the neoformation of hydroxysulfate.

Formation of arsenic−copper-containing particles and their sulfation decomposition mechanism in copper smelting flue gas

The heat recovery steam generator(HRSG)of copper smelting generates a large number of arsenic−coppercontaining particles,and the in-situ separation of arsenic and copper is of importance for cutting off environmental risk and realizing resource recovery.The formation of arsenic−copper-containing particles was simulated,the method of in-situ decomposition of arsenic−copper-containing particles by pyrite was proposed,and the decomposition mechanism was confirmed.It was found that particles with high arsenic content were formed in the simulated HRSG,and copper arsenate was liable for the high arsenic content.Pyrite promoted the sulfation of copper,leading to the in-situ decomposition of copper arsenate.In this process,gaseous arsenic was released,and thus the separation of arsenic and copper was realized.