The production of soda ash as a byproduct of extracting alumina from nepheline ores could be a lucrative, low-waste option for Russian companies, but, as IM Correspondent Vladislav Vorotnikov explains, there are a number of caveats to using the technology, particularly in a commodities market dogged by low prices.
Crystalline alumina samples with Al2O3 content of 95.23 wt.% were prepared directly from the nepheline ore in Nanjiang county, Sichuan province of China. Four steps were involved in the experiment of alumina preparation, including calcination, dissolution, carbonation and re-calcination.
Abstract The comparative economical analysis and energetic analysis of alumina production from various kinds of raw materials were carried out basing on industrial data. The main process parameters of nepheline raw materials processing through sintering adopted at large industrial scale are given.
Nepheline syenite—properties • In glass, alumina from nepheline syenite improves product hardness, durability, and resistance to chemical corrosion • in ceramics, nepheline syenite is used as a flux, melting at an early stage in the firing process and forming a glassy matrix that bonds together the other components of the system
27 engineering projects involved in coke-making, copper, iron, nepheline, and alumina Operation of an iron ore concentrator plant 13 environmental projects acquiring the required environmental permits
Prior art keywords red mud step nepheline alumina process according Prior art date 1986-06-26 Legal status (The legal status is an assumption and is not a legal conclusion.
Alumina is also produced from silicates in Russia from nepheline and there are attempts today in Canada to use kaolinite and anorthosite. While the Russian process is a success the other two processes are questionable. ALUMINA FROM NEPHELINE The production of Al 2 O 3 from nepheline is a unique process used only in Russia .
Get this from a library! Extraction of alumina from French River (Ontario) nepheline syenite by the lime-sinter process. [L G Ripley; Canada Centre for Mineral and Energy Technology.]
In nepheline raw material processing to alumina, raw material grinding during charge mixt. prepn. takes place simultaneously with charge mixt. drying, using sinter-step waste gases. During sintering, the charge mixt. is heated to 900-950 deg.C in 1-3 min. while in suspension.
Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known.
Nepheline syenite is valuable in glass batches to achieve the lowest melting temperature while acting as a source of alumina. Since nepheline syenite can be slightly soluble, in pugged bodies it can be responsible for stiffness changes during aging (although admittedly many other factors can also contribute to this).
how condition need for flotation of alumina from Nepheline syenite ?
Alumina can also be made from nepheline. Nepheline occurs in the form of apatite-nepheline rock (apatite is a calcium phosphorous oxide). The production process for making alumina from nepheline also by-produces soda, potash (a material used in construction, production of some chemicals, food industry etc.), and the rare metal gallium.
nepheline ore yields 1 tonne of alumina, 9–11 tonnes of cement, 0.6–0.8 tonnes of soda ash, and 0.2–0.3 tonnes of potash. According to the grade of the bauxite ore, 2–3 tonnes of ore yield one tonne of alumina and about one tonne of red mud (dry weight). When designing an alumina plant, factors
Razgah nepheline-bearing ore deposit is a promising source of alumina in Iran. The VAMI (Russian Aluminium-Magnesium Institute) studies on Razgah representative samples have revealed four types of ...
The severe need to consume Aluminum as a strategic metal has led the acquisition of annual production of one million tons Aluminum ingot to be at the top priority in ...
After the war, work began on restoring the Volkhov aluminum smelter, including its alumina production facilities, and the Tikhvin alumina plant. When considering what alumina production flowsheet to use at the Volkhov smelter, a nepheline concentrate was selected as a raw material.
presence of lime with the transfer of aluminum in a dis-solved state and the subsequent recovery from a solution of aluminum hydroxide. Using the hydrochemical pro-cessing of nepheline allows more than 2 times lowering energy costs for processing of nepheline to alumina. However, an industrial implementation of the method is
B. I. Arlyuk, "Comparative evaluation of efficiency of using bauxite and nepheline ores for production of alumina", Light Metals 1995 Edited by J. Evans, The Minerals, Metals & …
nepheline discriminator value higher than 0.62 while satisfying other property requirements. Therefore based on the findings of Li et al. , the strategy to develop high-Al2O3 glasses in this study was to formulate compositions that although were predicted to be within the nepheline
one million tons of alumina during the 11th Five-Year Plan, by 1985. With this additional domestic supply of alumina, imports are likely to decline again to some one million tons, or about 18 per cent of Soviet alumina requirements (Ta- ble 1). Bauxite, nepheline and alunite Soviet alumina …
Thus, when we refer to alumina, the context must be considered to determine if the reference is to Al 2 O 3, the oxide, or alumina, the material.-Strangely, window and container glasses have only tiny percentages of Al 2 O 3. A durable glass forms having the simple chemistry 10% CaO, 13% Na 2 …
This invention relates to the treatment of siliceous aluminous material and particularly ores containing nephelite and nepheline syenite. An object of this invention is to provide a method of extracting alumina from nephelite, nepheline syenite and other alumina-silica containing ores, slags and dusts.
They are aluminum silicate minerals that contain varying proportions of calcium, potassium, and sodium. Nepheline syenite is a light-colored, silica-deficient feldspathic rock made up mostly of sodium and potassium feldspars and nepheline. Although not mined in the United States for glass and ceramic use, nepheline syenite was imported from Canada.
Nov 16, 2016· Aluminum (also called Aluminium) the chemical element of atomic number 13, symbol of Al. It belongs to the group 13 of the periodic table and the poor metals family. The simple aluminum body is a ...
The nepheline syenite is calcined with limestone, produceing a mixture of CaSiO 3 and Na 2 O.Al 2 O 3. Leaching by caustic soda and treatment with CO 2 produces alumina and by-products. Flow sheet for alumina production from nepheline ore. The Russians have been the world's leaders in nepheline and its uses since World War II.
In principle, this is a dangerous situation for such a strategically important sector as the aluminum industry . The situation just alluded to obviously makes it important that imports of foreign-made "bauxite" alumina be re-placed by Russian-made "nepheline" alumina.
Plants producing metallurgical alumina from nepheline ores or other non-bauxitic sources (e.g.fly ash), which globally contribute less than 1% of production, are excluded due to processual and by-product differences and thus incomparability of energy intensities. Data Use
high-alumina would not result in nepheline crystal production, compositions not currently allowed by the nepheline discriminator. Optical basicity (OB) and the nepheline discriminator (ND) are two ways of describing a given complex glass composition. This report presents the theoretical and experimental basis for these models.
processing nepheline method - nanjil.org.in. Romania nepheline processing equipment fine grinder, Prospects of employing the nitric acid method to process nepheline for alumina and other products.