Basic Potassium Aluminum Sulfate

In the final purification processing of aluminum oxide by the Bretsznajder method, the principal product, basic aluminum ammonium sulfate, is contaminated with basic aluminum potassium sulfate. The latter is formed by the hydrolysis of aluminum potassium alum according to the equation 

Thermal decomposition of the preceding two basic sails finally yields foundry quality Al203. Using TG and other TA techniques, Pysiak and Glinka (681 studied the thermal decomposition of basic aluminum potassium sulfate and determined the intermediate products and the reaction kinetics. 

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Potassium alum is manufactured by treating bauxite with sulfuric acid and then potassium sulfate. Alternatively, aluminum sulfate is reacted with potassium sulfate, or the mineral alum stone, alunite, can be calciaed and leached with sulfuric acid. Alunite is a basic potassium aluminum sulfate... 

CAS 1344-28-1. KA13(0H)6(S04)3. A naturally occurring basic potassium aluminum sulfate usually found with volcanic and other igneous rocks. 

Alumet A process for extracting alumina and potassium sulfate from alunite ore (a basic hydrated potassium aluminum sulfate) involving reductive calcination and alkali leaching. Developed and piloted by the Alunite Metallurgical Company, UT, in the mid 1970s but not commercialized. See also Kalunite. 

In Activity 3.4, paper is made in a basic solution. For paper in which wood fibers are used, NaOH (sodium hydroxide) can make the pulp mixture basic by providing an excess of OH" ions. The NaOH breaks down cellulose fibers in the wood and other plant materials that form the primary paper structure. A suspension of these fibers can be placed on fabric on an embroidery hoop. Also, CIO- ions can act as oxidizing agents in the basic solution. Finally, KA1(S04)2 12H20 (potassium aluminum sulfate Alum) is added to the cellulose fibers to coagulate the pulp (clay is added when it is not naturally present). The aluminum ion (Al3+) helps the clay loosely bond to the cellulose fibers so that the resulting paper is dense and smooth. 

ALUNITE. The mineral alunite, KAl3(S04)2(0H)t , is a basic hydrous sulfate of aluminum and potassium a variety called natroalunite is rich in soda. Alunite crystallizes in the hexagonal system and forms rhombohedrons with small angles, hence resembling cubes. It may be in fibrous or tabular forms, or massive. Hardness, 3.5-4 sp gr, 2.58-2.75 luster, vitreous to pearly streak white transparent to opaque brittle color, white to grayish or reddish,... 

Kalunite [from K, potassium, and alunite, the ore] A process for extracting aluminum from alunite, a naturally occurring basic sulfate of aluminum and potassium having the idealized formula... 

Figure 4.30. TG curve of basic aluminum potassium sulfate. Pressure is 1 x 10 6 kPa at a healing rate of 2K min 1 (68).

Kalunite [Erom K, potassium, and alunite, the ore] A process for extracting aluminum from alunite, a naturally occurring basic sulfate of aluminum and potassium having the idealized formula KAl3(S04)2(0H)5. Based on an invention made by G.S. Tilley in 1924. The ore is first dehydrated at up to 600°C. It is then leached with a solution of sulfuric acid and potassium sulfate. After clarification of the leachate, potassinm... 

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