In this article, an improved chlorination process, a traditional cyanidation process, and a traditional aqua regia process were quantitatively analyzed and …

Extraction of gold from the refractory gold ores is commonly practiced by cyanide leaching, which simultaneously generates a significant amount of hazardous cyanide tailings. The cyanide tailings, still bearing certain amounts of residual gold, subsequently go through chlorination roasting to further recover Au, Ag, and other …

This work was supported by the National Natural Science Foundation of China (U1702252) and (51604135). Recommended articles. References (33) ... the gold recovery and chlorine removal rates achieved 81.87 % and 94.85 %, respectively. The participation of CaCl 2 led to the generation of new components with a low melting point …

This paper describes the chlorination roasting-water leaching process for the volatilization separation of gold, zinc and simultaneous vanadium recovery from carbonaceous gold ore. Chlorination roasting was conducted on carbonaceous gold ore. The chlorination residue and volatile precipitates were examined for textural and …

Chlorination was extensively used in gold extraction in the late 19th century until the development of cyanidation, a more economical process with a higher stability complex, rapidly replacing chlorination. ... (Grant No. 52104355, 52074363, 51922108, and U20A20273) and the National Key R&D Program of China (Grant No ... pyridine …

A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using …

The cobalt reserves and production of China account for 1.1 mass pct and about half of the world's reserves and production, respectively. ... Therefore, cobalt recovery by the chlorination-volatilization method should be carried out in a dry atmosphere. ... Research on the Extraction of Gold from Gold-Bearing Pyrite Cinder by …

The most commonly used cyanide salts are KCN and NaCN, which are easily soluble in water. Cyanide leaching is the dominating process for gold recovery from primary resources, due to …

The cyanide tailings used in this work were received from a Gold smeltery in Yan Tai of China. The major elements of the CT were determined with X-ray fluorescence (XRF), as shown in Table 1, are O, Fe, Si, Al, C and Ca.The contents of Au and Ag determined by fire assaying are 10.8 and 24.8 g/T (see Table 1), respectively.The X-ray …

The method consisted of two stages roasting for arsenic and sulfur removal, gold recovery by thiourea leaching, followed by an enhanced chlorination roasting for gold recovery in the presence of pyrite. In the two-stage roasting process, the phase transition of FeAsS and FeS 2 during the roasting process was analyzed. In the first …

(24) Au + 2 CS (N H 2) 2 + F e 3 + → Au (CS (N H 2) 2) 2 + + F e 2 + Low dissolution of other metals, high gold recovery from concentrates of iron-ores and reasonable dissolution efficiency when applied to refractory ores are the main advantages of thiourea has over cyanide (Yannopoulos, 1991). 4.1.5. Thiocyanate. The thiocyanate …

The chlorine oxidation method has the advantages of low cost, simple procedure and high degree of automation, and has a good removal effect on weak …

Scalable and selective gold recovery from end-of-life electronics. Received: 4 July 2023. Accepted: 18 December 2023. Hengjun Shang1, Yao Chen1,2, Shuhui Guan1, Yue Wang1, Jiazhen Cao1, Xinru ...

chlorination of gold below 700 C. In contrast, vanadium oxide could promote chlorination of ... Sciences, Beijing 100190, P.R. China and also with the University of Chinese Academy of Sciences, Beijing, 100049, P.R. China. Contact e- ... materials and a high gold recovery rate.[27–30] Wang

Results indicate that gold extraction is favored by increasing, both, the temperature and the reaction time. The best recovery values were of 98.23% at 873 K and 3600 s and of 98.73% at 873 K and 5400 s, with very low attack of the matrix containing the metal. The powder of pure gold was not chlorinated at this temperature level.

Waste electric and electronic equipment (WEEE) usually contains many recoverable and valuable elements, including gold and copper. Primitive technologies, such as aqua regia leaching and calcination, are still widely used in China, which has caused serious pollution in local environments. Chlorination is a feasible alternative for the …

The results show that gold chlorination reaction was controlled by the interfacial chemical reaction, and the apparent activation energy was 40.05 kJ/mol. …

e cient manner. The use of an acidic ferric chloride solution, ffi. along with simultaneous electrowinning, results in a higher weight percentage of gold in the remaining solid residue.96 In this instance copper recovery was high (99%), and electro-chemical recovery of gold was more e cient as the residues. ffi.

These two methods have been applied successfully in the practice. 2 Selective chlorination leaching of gold- antimony alloy The raw material is the gold-antimony alloy (particle size 0147 m) produced by an antimony smelter of Hunan Province, China. ... et al/Trans. Nonferrous Met. Soc. China 20(2010) 322 329 329 chlorination …

The experiment on recovery of gold and iron by one-step chlorination-reduction roasting in the muffle furnace was conducted using cyanide tailings from a …

The development and application of chlorination metallurgy can be traced back to the middle of the 16th century. At that time, it was found that the recovery rate of metals can be improved by adding a certain amount of salt to the leaching process of ores containing gold and silver. It was not until the 18th century that the leaching process ...

The cyanide tailings, still bearing certain amounts of residual gold, subsequently go through chlorination roasting to further recover Au, Ag, and other …

To develop a cleaner production technology for the construction of secondary resources, this study researched the best chlorine source for the sustainable …

The yield of chlorine gas was almost constant in the range of 1223–1323 K, and it can be inferred that the yield of chlorine gas at 1223 K was sufficient for the complete chlorination of gold. The gold recovery rate was mainly determined by temperature. Fig. 10 (c) shows the relationship between the oxidation rate of sulfur and …

The CT used in this work were received from a gold smeltery in Yan Tai (China). ... Fig. 13 indicates the comparison between the microwave chlorination roasting process and traditional chlorination roasting process. Gold recovery by microwave chlorination roasting involving CaCl 2 is a green process. Low energy consumption and …

2.1 Materials and reagents. All the reagents used in the experiment, such as sulfuric acid (H 2 SO 4), nitric acid (HNO 3), copper sulfate (CuSO 4), sodium thiosulfate (Na 2 S 2 SO 3), and sodium hydroxide (NaOH), were analytically pure, and the water used in the whole experiment was deionized water with the electrical resistivity of 18.5 …

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.

This study showed the kinetics of gold chlorination leaching from an anode slime complex containing copper, silver, barium, selenium, and tellurium. AgCl and BaSO4 control the rate of gold leaching, and the interface transfer and diffusion across the product was selected as the desirable kinetic model. The concentration of hydrochloric acid, …

QIN et al [18] investigated the effect of chlorination roasting with pyrite on gold and silver recovery efficiencies from gold tailings. The results demonstrated that the addition of pyrite during the chlorination process promoted the recovery of gold and silver from gold tailings, and 98.56% of gold and 87.92% of silver were recovered under ...

X-ray diffraction (XRD), scanning electron microscopy (SEM), and chemical-phase analysis were performed to investigate the effects of iron phase transformation on …