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Synthesis of sodium polysulphide for copper ore processing UDC 669.3:622.765 Sodium polysulphide consists of yellow-brown, yellow-green crystals. Its chemical formulas are Na 2S 2, Na 2S 3, Na 2S 4. Currently there are several known methods for the production of sodium sulfide: chemical reduction of sodium sulphate by solid carbonaceous material; reduc
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mined trona ore, while California soda ash is derived from sodium carbonate-rich brine extracted from Searles Lake. There are four distinct methods used to mine the Wyoming trona ore: 1) solution mining, 2) room-and-pillar, 3) longwall, and 4) shortwall. In solution mining, dilute sodium hydroxideRead More
The mother liquor is separated and reacted with ammonia and carbon dioxide collected from the reacting step to crystalize sodium bicarbonate and produce an ammonium chloride brine solution which isRead More
In a process system where uranium values in a water slurry of crushed uranium ore are treated by a solution of carbonate in system water to convert the uranium to a soluble uranyl tricarbonate ion, the slurry then being filtered to remove waste solids delivered to a tailings pond containing system water, and the filtrate being separately treated to precipitate uranium oxide: the improvement characterized by adding to the slurry, fed to the filter, sodiumRead More
Extraction of Sodium The two methods used for extracting sodium metals are, * Castner's process: By the electrolysis of fused caustic soda. * Down's process: By the electrolysis of fused sodium chloride. Castner's process Molten sodium hydroxide (caustic soda, NaOH) is electrolyzed using an iron cathode and nickel anodeRead More
Abstract. Sodium chromate is produced via the soda-ash roasting of chromite ore with sodium carbonate. After the reaction, nearly 15 pct of the chromium oxide remains unreacted and ends up in the waste stream, for landfills. In recent years, the concern over environmental pollution from hexavalent chromium (Cr 6+) from the waste residue has become a major problem for the chromium chemicalRead More
Aug 05, 2021 Abstract. Hexavalent chromium in soda ash Chromite Ore Processing Residue (COPR) is harmful to the environment, it is imperative to develop a low cost, efficient, and effective treatment. Herein, a new method (ball milling + sodium sulfide) was developed for mechanochemical treatment of water-leached COPR (W-COPR, about 900 mg/kg non-exchangeble Cr (VI) and mostly chromiteRead More
Mar 15, 2012 Mar 15, 2012 Treatment of chromite ore processing residue using sodium sulfide. Hazardous and industrial waste treatment I. Proceedings of 2nd International Conference on Hazardous and Industrial Waste Management, Chania-Crete, Greece (2010), pp. 167-169. View Record inRead More
Apr 05, 2020 Apr 05, 2020 The process, as practiced today, is briefly as follows: The ore is crushed to about minus fourteen mesh and mixed with crude sodium chloride according to the formula: six percent sodium chloride, plus one percent sodium chloride for each one percent, of equivalent vanadium pent-oxide contained in the oreRead More
Mekanism provides 4 tiers of systems to process ores and obtain two to five ingots from 1 ore. The complexity of the systems rises with each tier and at the higher tiers various secondary machines are required to produce consumables for the main ore processing line. The following page shows the layout of these systems as well as some in-game pictures and descriptions. All machines are onlyRead More
chlorination process merited reappraisal. Walker (1956) developed a process at Kalgurgli Ore Treatment Company for the treatment of zinc Merrill slimes by chlorination followed by reprecipitation using sodium sulphite. A similar process was conducted by Finkelstein et al. (1966) in South Africa for the treatment of MerrillRead More
Jul 07, 2021 In this work, the selective reduction of lateritic nickel ore was carried out using sodium sulfate, sodium carbonate, and sodium chloride as additives. The 5 wt% of anthracite coal, which contains 60.35% of fixed carbon and 1.9% of sulfur, was used as a reductant. All raw materials were mixed homogenously prior to the pelletization process into 10–15 mm of diameter. The reduction processRead More
Uranium leaching is the process by which the uranium is extracted from the raw ore by reacting the material with acid or base. Fig. 2 shows a general process flow for the uranium extraction process. Prior to the leaching process, the ore is often given preliminary treatments thatRead More
Bayer process is the main industrial method in alumina producing. Bayer process is suitable for processing low silicon bauxite with good quality but is not suitable for goethite with aluminum. The production process is that: in the pressure cooking device, caustic alkali is used to leach bauxite so that we can get sodium aluminate solutionRead More