Experimental process analysis and mathematical modeling …
Selective gold leaching contained in copper - gold slag, by wet chlorination. • 87% Cu were readily extracted through nitric acid pre-treatment. • HNO 3 pre-treatment reduces NaOCl consumption and increasing gold extraction yield. • The highest gold extraction yield (98%) was obtained using Cl 2 in presence of HCl. •
An environmental-friendly approach to remove cyanide in gold …
CaCl2 as the best chlorination agent, gold recovery and chlorine removal rates were 85.2% and 95%, under the optimal conditions. The specific action mechanism of CaCl2 in the process of microwave ...
High-temperature chlorination of gold with transformation …
Gold in cyanide tailings from Shandong Province is mainly encapsulated by hematite and magnetite at distribution rates of 76.49 % and 10.88 %, respectively. Chlorination–reduction one-step roasting of cyanide tailings was conducted under the following conditions: calcium chloride dosage of 6 %, bituminous coal dosage of 30 %, …
(PDF) Extraction of Gold and Silver in the Selective Chlorination …
Li et al. [20] also used the chlorination roasting method to extract gold and silver from cyanide tailings and found that after the recovery rate of gold and silver was up to 91.6% and 54.7% ...
Experimental process analysis and mathematical modeling …
Currently, dry chlorination and wet chlorination are most used techniques for conversion of metals into metal chlorides (Cui et al., 2018a). In dry chlorination agents like NaCl, CaCl2, KCl, and NH4Cl are used for treatment while Cl2 and HCl are being used in wet chlorination (Xia et al., 2020; Olteanu et al., 2014; Cui et al., 2018b).
Simultaneous Extraction of Gold and Vanadium From …
To realize the efficient comprehensive utilization of refractory gold ore resources and environmental and economic gold extraction methods, this study investigated the optimal chlorine source for the sustained recovery of gold and vanadium from carbonaceous refractory gold ore by chlorination heat treatment. During the …
Gold Leaching Process
Barren solution as necessary is added to the first agitator to maintain the pulp at near 50% solids. A retention period of 48 hours is provided in the agitators. Air from a positive type rotary blower at 12 PSI is connected to center air lifts to provide agitation and aeration. From the agitators the pulp flows to three counter-current single ...
Recovery and kinetics of gold and iron from cyanide tailings …
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 gold smelting enterprises (Henan Province, China) as research object. The effects of the dosage of calcium chloride, dosage of bituminous coal, roasting temperature, roasting time, and other factors on the …
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Recovery of Gold from Alluvial Sand by Wet Chlorination
A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power ...
(PDF) A systematic review of gold extraction: Fundamentals
Chlorination was extensively used in gold extraction in the late 19th century until the development of cyanidation, a more economical process w ith a higher stability complex, rapidly replacing ...
Gold extraction by chlorination using a pyrometallurgical …
The results of this study allow to conclude that it is possible to recover gold from alluvial materials by an alternative process such as chlorination, preventing …
Gold Chlorination Processes & Methods
In the Plattner process which was in constant use from 1851 to about 1916 for the treatment of pyrite concentrates, the material after dead roasting was leached in … See more
Chlorination Chemistry
Chlorination Chemistry. When chlorine is added to water, a variety of chemical processes take place. The chlorine reacts with compounds in the water and with the water itself. Some of the results of these reactions (known as the chlorine residual) are able to kill microorganisms in the water. In the following sections, we will show the chemical ...
Recovery and kinetics of gold and iron from cyanide tailings …
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 gold smelting enterprises (Henan Province ...
Gold Chlorination Process in VAT
Permanganate Chlorination Process. This process differs from the ordinary treatment of ore in vats by chlorine water only in the use of a different solution. M. Etard …
Gold Ore Chlorination
Experience has shown how difficult it is to obtain information regarding laboratory-tests in connection with the gold ore chlorination process for the extraction of gold from its ores, and I therefore present the following method, somewhat in detail, for the benefit of those who may desire to pursue research work in this field.. The ore chosen …
Research Progress of Gold Extracting by Chlorination
Research on gold extraction by chlorination has shown a significant increase since 2010, and there are more literatures on gold extraction by liquid …
Simultaneous extraction of gold and zinc from
A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated.
Minerals | Free Full-Text | Advances in Hydrometallurgical Gold …
Hydrometallurgical gold recovery processes play a pivotal role in the gold mining industry, contributing to more than 90% of global gold production. Among the array of techniques available, the Merrill–Crowe process, adsorption, ion exchange, and solvent extraction are central in extracting gold from leach solutions. While the Merrill–Crowe …
Gold Chlorination Process by Miller
Miller's Gold Chlorination process was introduced by F.B. Miller. The refining process employs chlorine gas, which passed into molten gold covered with a layer of borax and silica, and reacts with most of metals present in the molten charge. Platinum group metals do not react. Basically, gold is slightly attacked in the first moments and all ...
Behavior of silver and lead in selective chlorination
The reducing rate of silver can exceed 99% at 80°C 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 ...
(PDF) A systematic review of gold extraction: …
Over the past three decades, a significant amount of literature has examined alternative lixiviants to cyanide for recovering gold, while few industrial applications have been reported due to...
Research on chlorination leaching of pressure-oxidized refractory gold
As a result, the optimum conditions of the chlorination leaching for the refractory gold concentrate pretreated by pressure oxidation are as follows: 4 of pH, above 1.0 V of the redox potential ...
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Gold extraction by chlorination using a pyrometallurgical …
The fact that gold chlorination is reached at lower temperatures might be explained by the formation of binary gold chloride in the vapor phase, which might be extracted from the reaction zone (Heinen and Eisele, 1974; Habashi, 1986). The previous characterizations carried out on sample m2 indicated the presence of iron oxide, which has a great ...
Mechanism and application of the ore with chlorination …
The application of chlorination metallurgy was introduced. The thermodynamic feasibility of treating ores by chlorination metallurgy was also analyzed. As a very effective metallurgical method for processing complex metal minerals, Chlorination metallurgy has been widely used in the metallurgical industry. In this paper, the …
The Barrel Gold Chlorination Process
The use of revolving barrels for chlorinating ores was perhaps suggested by the old Freiberg method of barrel amalgamation. It has already been mentioned, p. 239, that Dr. Duflos used a revolving …
Minerals | Free Full-Text | The Recovery of Gold in Low …
The resource utilization of cyanide tailings has significant environmental and economic benefits. The efficient recovery of gold from low-grade cyanide tailings containing 1.71 g/t Au was performed by a chlorination roasting–flotation process. The effects of roasting temperature, calcium chloride, internal coke, external coke, copper sulfide …
[GOLD EXTRACTION WITH CHLORINATION]
Firstly, the dissolution rate of gold during chlorination is much faster than with cyanidation. Secondly, carbonaceous ores are more amenable to chlorination. Finally, the reagent cost (1.5 $/t ...