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06 Dec 2020

Sands Company purchased mining rights for $500,000. Depending on the chlorine content in the roaster feed, HCl may also exist in the roasting gas in corresponding concentrations. They expect to harvest 1 million tons of ore over the next five years. 2ZnS + 30 2 \(\stackrel{\Delta}{\longrightarrow}\) 2ZnO + 2S0 2: 1. 2. Roasting In this process , the ore is heated alone or mixed with other materials under regular supply of air at a temperature below the melting point of the metal. 5. This process is followed to thermally decompose the sulfate or carbonate ores into the oxides of their metal. In this process roasted are mixed with coke in the ration of 2:1 and small briquets are made. 2. In the extraction of metals from sulfides, roasting is applied to achieve different objectives depending on the overall process flow sheet. The calcine consists of Fe2O3, Fe3O4, FeSO4 and gangue material, while the roasting gas has SO2, SO3, O2, N2 and H2O as steam. Name an ore on which roasting is done. e.g. Give balanced equation. Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. N. Ahern, in Gold Ore Processing (Second Edition), 2016. The report is heated externally by burning produce gas (w+N 2 ) to about 1400 0 c. 2.1 Oxidative Pretreatment. Question 14. The process that is applied is calcination. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. It is used for the con­centration of carbon­ate ores. The process used for the concentration of the ore is froth floatation process. Roasting is usually applied to sulphide ore. During roasting a. Moisture is driven away impurities are … Get Price The process of heat­ing ore in limited sup­ply or absence of air. For the ores Cu2S (chalcocite) and ZnS (sphalerite), balanced equations for the roasting are:- 2 Cu2S + 3O2 → 2 Cu2O + 2 SO2 2 ZnS + 3 O2 → 2 ZnO + 2 SO2 6. Roasting: Calcination: 1. The ore which can be attracted by the magnetic field can be concentrated by the process of magnetic separation. During the current year, Sands mined 350,000 tons of ore. The recovery of gold from refractory sulfidic-carbonaceous ores after roasting pretreatment was studied. (a) During roasting, moisture is removed from the ore (b) The ore is free from almost all non-metallic impurities (c) Calcination of ore is carried out in the absence of any blast of air (d) The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy. The entry to record the depletion would include Question options: 1) a debit to Accumulated Depletion for $175,000 2) a debit to Depletion Expense for $175,000 3) During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas. Among the ores mentioned in table 6.1, the ores of iron such as haematite (Fe 2 O 3), magnetite (Fe 3 O 4), siderite (FeCO 3), and iron pyrites (FeS 2) can be separated by the process of magnetic separation. Question 12 (a) Define roasting. (b) Define calcination. During roasting of gold ores and concentrates, mercury is released to the gas phase, with the extent of release dependent on the mineralogical composition of the roaster feed and on the roasting conditions (temperature, roasting atmosphere and roasting time).. Give example and equation for calcination. This process is generally applied to sulphide minerals. The products gained from the roasting process are calcine and roasting gas. Alternatively, there is one another process that is used to covert the ores to their respective oxides, and it is called roasting. These briquets are fed into vertical report furnance, from the charging door. The process of heating ore in presence of ex­cess of air. It is used for concen­tration of sulphide ores. Such objectives include one or more of the following: oxidizing roast, sulfation roast, roast‐reduction, chloridizing roast, and volatilizing roast.

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