This property of chlorine attracts the authors to use chlorine to extract metal from their respective minerals. However, the gradual depletion of rich ores and primary resources attracts attention to the treatment of low-grade and more complex ores, and the recycling of scraps is very much needed [17] .

In a groundbreaking study led by Omani scientists, the spotlight is on the Sultanate's vast potential to harness high-quality silica sand for cost-effective thermal energy storage. This revelation holds the …

Figure 1. pH dependence of the extraction of selected cations by D2EHPA [3]. In contrast to the zinc industry itself, zinc SX has found wider application in the refining of other base metals, providing an efficient means for the removal of zinc as an impurity species. These applications are surveyed elsewhere [4].

Gold extraction yield of 99% was reached only for high-temperature chlorination of the material with elemental chlorine. However, poor selectivity was the price paid. At higher temperatures, the …

When using chlorine gas, the major chlorination reaction of oxide can be written as: (1) Me x O y + yC + yCl 2 = xMeCl 2y/x + yCO. The carbochlorination process (Fan et al., 2011, Ojeda et al., 2002, Zhang et al., 2012) described in this article is an effective way to extract alumina and silica from fly ash. The disclosed carbochlorination ...

The results are shown in Fig. 3, which shows that the extraction of zinc and that of iron and silica increased significantly with increasing sulfuric acid concentrations …

An anion-exchange-based chromatographic separation approach was developed to selectively recover zinc and copper from the high-chlorine raffinate generated in the process of germanium chlorination distillation using 717 resins based on the coordination difference between Zn 2+ /Cu 2+ and Cl –.The theoretical calculation and …

The genetic features of quartz sands and quartzites of Oman are determined. It is established that, along with coastal-marine, there are also delta varieties of quartz sand and quartzite.

However, it's important to select quality silica sand that is properly washed and graded for pool filtration. Industry best practice is to use #20 Silica Sand which is greater than 95% silica and guarantees an effective grain size of 0.45 to 0.55 millimetres, trapping particles with diameters between 20 and 80 microns (the human eye can see down to 50 or 60 …

In different nonferrous metal-producing industry sectors, the impurity element iron has to be removed from the process solution. Examples for the arising residues are jarosite or goethite precipitates from nickel or zinc production but also red mud from aluminum production. Regardless of environmental concerns, the material is …

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.

A solution of monosilicic acid (Si (OH) 4) was produced by leaching willemite (Zn 2 SiO 4) in sulphuric acid. Precipitation was monitored by measuring the turbidity and silica …

The role of silica in the chlorination–volatilization of cobalt oxide, using calcium chloride, is investigated in this paper. It is found that the Co volatilization percentage of the CoO–Fe2O3–CaCl2 system is not larger than 12.1%. Silica plays an important role in the chlorination–volatilization of cobalt oxide by using calcium …

The study consists of chlorination roasting of two different zinc processing residues for the recovery of gallium. The study discusses the effects of temperature and chlorine gas concentration on the extraction via chloride fuming of Ga, Fe, Pb, and Zn. Gallium extractions of 50%, 60 %, and 80 % were achieved from zinc processing residues.

Removes chlorine, herbicides, pesticides, pharmaceuticals, industrial chemicals Trihalomethanes (THMs), heavy metals, organic chemicals, odor, colour and particulars. Contains a copper-zinc filter medium that inhibits the growth of bacteria in the filter. Stage 2 -Charge Sand: Provides additional filtration.

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 ...

In this research, zinc, gallium, and germanium were selectively dissolved from zinc refinery residue by stepwise leaching. The thermodynamic study demonstrated that Zn, Ga, and Ge could be selectively leached by controlling a suitable pH condition.In the first stage of leaching with sulfuric acid media, >93% of the Zn content, approximately …

Decrease of chlorination rate with the increase of partial pressure of oxygen could be explained by the occupation of adsorption sites of chlorine atoms by oxygen and the chlorination rate was ...

Optimum extraction performance has been shown to be obtained with the extraction circuit controlled at 40–45°C. Because the reaction is endothermic, higher temperatures improves zinc extraction but also increases co-extraction of impurities9. Temperature variations affect the viscosity of the organic phase and thus the phase disengagement ...

ABSTRACT. The beneficiation of agricultural waste is a topical issue in the field of sustainable and renewable energy …

Then, the chlorination roasting experiments were run for a Hong-jun WANG, et al/Trans. Nonferrous Met. Soc. China 30(2020) 1111âˆ'1123 1114 Fig. 3 Flow sheet of simultaneous extraction of gold and zinc by chlorination roasting (a), and flow sheet of verification experiment of sulfur content on extraction of gold and zinc (b) Table 3 ...

This study aims to extract and optimize silica from rice husk (RH) using the response surface methodology. The effects of temperature, potassium hydroxide to rice husk ratio (KOH: RH), and exposure time were modeled. The developed model was significant and adequately precise to navigate the design space with a percentage of …

Zinc plant leach residues (ZPLRs) contain significant amounts of metal compounds of lead (Pb), zinc (Zn), iron (Fe), etc., hence, they are considered as a secondary source of metals.

Oman's mountain ranges contain exposed ophiolite rocks, where gold, copper, zinc, silver, chromite and lead can be found. Oman also contains many nonmetallic minerals, such …

The carbochlorination of alumina and silica was governed by chemical reactions at 850–950 ℃, with an activation energy of 65.70 kJ/mol and 90.05 kJ/mol, respectively. The reaction order for the chlorination process of aluminum in the fly ash has been determined to be 1.59.

We describe a process of chlorination of fly ash with either chlorine gas or calcium chloride, which successfully decomposes mullite and permits the extraction of a number of industrially useful, acid-soluble compounds. As a guide for determining optimal input molar ratios and temperatures, the Gibbs energies for three groups of reactions of major fly …

Almost 29.57–38.46 million tons of zinc-bearing dust were produced in Chinese iron and steel enterprises annually. The recovery of Zn and other metals in zinc-bearing dust from ironmaking and steelmaking could improve economic efficiency. However, zinc-bearing dust was classified as hazardous waste, and the volatile metals (like Zn, Na, Pb, etc.) in …

The copper smelting process produces plenty of copper slag every year, which is a hazardous solid waste, but a secondary resource. In the present study, the extraction of copper, nickel, and cobalt from copper slag was investigated through the process of sulfation roasting–water leaching and the process of sulfation …

In our recent studies, mesoporous silica-based materials, such as a Mobil Composition of Matter No.41 (MCM-41) and its modification with a titanium hydrogen phosphate (MCM-41-TP) demonstrated excellent selectivity towards nitrogen-containing compounds using both SPME Arrow and in-tube extraction (ITEX) sampling systems [10].

A sustainable separation concept for large-scale recycling of NdFeB magnets under atmospheric pressure was developed by utilizing a combination of two separation concepts known from the literature: (I) selective pre-separation by in situ chlorination and evaporation of ground oxidized NdFeB material and (II) subsequent …