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1. Introduction. There is a wide range of processing methods for alunite that are created in order to access the maximum recovery of alumina and its peripheral products, using various operation units such as preconcentration, calcination, leaching, and crystallization, utilizing different reagents including acids and bases.
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High-alumina minerals refer, in this paper, to Al-rich, normal sedimentary phases, including gibbsite, boehmite, diaspore, possibly "proto-diaspore" and "proto-alunite", "Al-chlorite", and corundum, in association with kaolin minerals. They may be derived from any common Al-containing rock. Processes of origin include direct bauxitization of non-clay silicate …
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The formation and coexistence of four aluminum compounds, namely, gibbsite (Al(OH)3), boehmite (AlOOH), alumina (Al2O3) and alunite (NaAl3(OH)6(SO4)2) is reported under laboratory conditions. These solid phases were formed as hydrolytic products of aluminum sulphate solutions at room temperature. These results provide evidence that thermal …
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alunite alumina production Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Application number AU17908/76A Other languages
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The highest alumina extraction values from the non-activated alunite ore were ∼6% by leaching in 1M H2SO4 solution for 30 min without calcination and ∼50% after calcination at 600°C for 1 h ...
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alunite, leucite, shales, feldspar, and others. BAYER PROCESS In accordance with the principle of the survival of the fittest, the mineral almost exclusively worked for alumina and pure aluminum compounds at present is bauxite; it is worked mainly by the Bayer process for alumina, and by acid extraction for alums and lower grades of aluminum ...
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Alunite Ore. Alunite KAl 3 (SO 4) 2 (OH) 6, is a sulfate mineral ore used as a source of potash or for making alum. It occurs in potassium rich volcanic rocks that are white and grey in colour. It is formed in rhombohedra crystals or in fine-grained compact masses. Alunite mineralization is found on four ridges which occur within SOPerior ...
Details7 Be it known that I, HOWARD F. GHAPPE L, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Methods of Recovering Potassium Sulfate and Alumina from Alunite; and I do hereby declare the following to be a full, clear, andexact description of …
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Alunite: Alunite (KAl3(SO4)2(OH)6) is a potassium aluminum sulfate mineral that can be used as a source of aluminum. These are some of the common minerals that contain aluminum and are considered as aluminum ore minerals. These minerals are typically mined and processed to extract aluminum metal through various …
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The invention discloses an extraction technology of alumina and potassium sulfate from alunite by using a hot-pressing leaching process, comprising the following steps: mixing the alunite with a potassium hydroxide solution to prepare pulp; transferring the pulp into a hot-pressing system, carrying out hot-pressing leaching at 100-300 DEG C, cooling the …
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Alunite at Hugo Dummett and Central formed from a vapor condensate, that underwent the SO 2 disproportionation reaction (4SO 2 + 4H 2 O = 2H 2 SO 4 + 2H 2 S) at temperatures <450 C, and formed acidic fluids at temperatures below 300 C. The temperature of formation of alunite is estimated from the isotope data to be about 260°C.
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The rapid development of the global alumina and aluminum industry is straight coupled with the demands and the needs of these materials. Nowadays, the only well-known accessible resources to produce alumina and aluminum are bauxite ores. But bauxite ores are limited, and the remaining exploitable reserves do not have high …
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The alumina-rich potassium aluminate liquor is separated from the leaching solution, and then the alumina is crystallized (precipitated) as hydrate by seeding with aluminum hydroxide crystals. Secondary nucleation and subsequent crystal growth are two main steps in the industrial crystallization.
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Alum is a type of chemical compound that is commonly used in everyday and industrial applications. You'll find alum in everything from baking powder and toothpaste to cosmetics and some fire extinguishers, but there are also various types of alum with different use cases. Usually, when you hear about alum it is in reference to potassium …
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Alumina is produced from alunite by extraction with sulfuric acid according to the following method. First, alunite is calcined at about 900 8C. Thus, the
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Method of producing pure alumina from alunite US20030074946A1 (en) * : : Campo Santiago Garcia: Deformation of thin walled bodies Similar Documents. Publication Publication Date Title; CN108330298B (en) : Method for extracting rubidium, cesium, lithium and potassium from polymetallic mica ore ...
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The pilot scale facility should provide a cost-effective major de-risking step for the processing of alunite into the alumina, SOP and acid product streams. The pilot operation can produce ...
Detailsove sea level of 3715 m and. It has 4964 km of coastline.Figure 1- Loc. tion of SpainSpain is not an aluminum-producing country. The country's metallic mining production is mainly related to co. per, zinc, tin, nickel, gold, silver, lead and, tungsten.In 2016, only 6 mines related to metal mining were active (Panorama Minero,
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General Alunite Information : Chemical Formula: KAl3(SO4)2(OH)6 : Composition: Molecular Weight = 414.21 gm Potassium 9.44 % K 11.37 % K 2 O Aluminum 19.54 % Al 36.92 % Al 2 O 3 Hydrogen 1.46 % H 13.05 % H 2 O Sulfur 15.48 % S 38.66 % SO 3 Oxygen 54.08 % O ...
DetailsPhysical and Chemical Properties. Alumina is a white crystalline solid that often exists in the form of hexagonal crystals. However, it can also occur in other polymorphic forms such as cubic or orthorhombic structures. With a high melting point of over 2000 o C, Alumina demonstrates excellent thermal stability and resistance to thermal shock ...
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2. Experimental2.1. Preparation of alumina-sulfuric acid. Freshly distilled chlorosulfonic acid (0.2 ml, 3 mmol) was slowly added to neutral alumina (10 g, dried at 130 °C for 2 h) with stirring.The liberated HCl was removed through a CaCl 2 drying tube under reduced pressure to a water trap. Then it was kept in this condition for 1 h at room …
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Alumina in various modifications, individual crystalline (see Additional file 1: Figure S1, Table S1) and amorphous or in complex oxides such as clays and zeolites, is widely used in industry, scientific equipment, medicine, etc. [1–6].Among different phases of alumina, corundum (α-Al 2 O 3) is characterized by very high hardness (equal to 9 …
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Li, D., Jiang, K., Jiang, X., Wang, S., Fan, Y., & Liu, W. (2018). The recovery of potassium oxide and alumina from alunite concentrate. Hydrometallurgy, 176, 1–8 ...
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Alumina is widely used in ceramics, abrasives, pigments, plastics, rubber, gems, cement, and other fields [16, 17]. The aluminate cement made by bauxite (mainly alumina) and limestone has a fast ...
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