Aluminium Sulfate

Aluminium sulfate is a chemical compound which is soluble in water and is mainly used as a flocking agent which is used to improve filter-ability and sedimentation of small particles in the process of purifying the water. It is also used for treating a waste water in industrial plants and in paper manufacturing industries.

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Detailed Description for Aluminium Sulfate

Aluminium sulfate is a chemical compound with the formula Al2(SO4)3. It is soluble in water and is mainly used as a flocculating agent in the purification of drinking water[3][4] and waste water treatment plants, and also in paper manufacturing.

Aluminium sulfate is sometimes referred to as a type of alum. Alums are double sulfate salts, with the formula AM(SO4)2·12H2O, where A is a monovalent cation such as potassium or ammonium and M is a trivalent metal ion such as aluminium.[5] The anhydrous form occurs naturally as a rare mineral millosevichite, found e.g. in volcanic environments and on burning coal-mining waste dumps. Aluminium sulfate is rarely, if ever, encountered as the anhydrous salt. It forms a number of different hydrates, of which the hexadecahydrate Al2(SO4)3•16H2O and octadecahydrate Al2(SO4)3•18H2O are the most common. The heptadecahydrate, whose formula can be written as [Al(H2O)6]2(SO4)3•5H2O, occurs naturally as the mineral alunogen.

Aluminum sulfate is a chemical compound that’s sometimes referred to as sulfuric acid, aluminum salt, or cake alum. It has a wide variety of applications, including waste treatment, water purification, and paper manufacturing.

Chemical Properties:

Aluminum sulfate is an odorless, white, or off-white crystalline solid or powder. The compound is made by adding aluminum hydroxide to sulfuric acid. It’s hygroscopic, which means it has the ability to absorb and hold water molecules from the surrounding atmosphere. It’s also water soluble and not volatile or flammable. Aluminum sulfate is extremely acidic. When combined in solution with water its pH can be less than two, which can make it capable of burning human skin and corroding metal.

Items

Specifications

I Type:Low Ferrous/Low Iron

II Type:Non-Ferrous/Iron-free

First Class

Qualified

First Class

Qualified

Al2O3 % ≥

15.8

15.6

17

16

Ferrous(Fe )% ≤

0.5

0.7

0.005

0.01

Water Insolube % ≤

0.1

0.15

0.1

0.15

PH (1% aqueous solution) ≥

3.0

3.0

3.0

3.0

Arsenic(As) %≤

   

0.0005

0.0005

Heavy metal (Pb) %≤

   

0.002

0.002

 

Uses:

Aluminium sulfate is used in water purification and as a mordant in dyeing and printing textiles. In water purification, it causes impurities to coagulate into larger particles and then settle to the bottom of the container (or be filtered out) more easily. This process is called coagulation or flocculation. Research suggests that in Australia, aluminium sulfate used this way in drinking water treatment is the primary source of hydrogen sulfide gas in sanitary sewer systems. Improper and excess application polluted the water supply of Camelford in Cornwall.

 

When dissolved in a large amount of neutral or slightly alkaline water, aluminium sulfate produces a gelatinous precipitate of aluminium hydroxide, Al(OH)3. In dyeing and printing cloth, the gelatinous precipitate helps the dye adhere to the clothing fibers by rendering the pigment insoluble.

 

Aluminium sulfate is sometimes used to reduce the pH of garden soil, as it hydrolyzes to form the aluminium hydroxide precipitate and a dilute sulfuric acid solution. An example of what changing the pH level of soil can do to plants is visible when looking at Hydrangea macrophylla. The gardener can add aluminium sulfate to the soil to reduce the pH which in turn will result in the flowers of the Hydrangea turning a different color (blue). The aluminium is what makes the flowers blue; at a higher pH, the aluminium is not available to the plant. Thus, both the aluminium and sulfur keep the plants blue.

 


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