Aluminum sulfate is a chemical compound, more precisely it’s a mineral salt that is non-flammable and non-toxic, its appearance is in the form of crystals, powder, or even white granules which dissolve well in water and it is insoluble in alcohol. Al2(SO4)3 is the chemical formula of this salt. Similar products include polyacrylamide or sodium hypochlorite.
Aluminum sulfate is also known as alum or white alum, it is one of the most widely used aluminum compounds that also have water absorption properties. This chemical is available in different grades and forms. This chemical compound is volatile and highly acidic and is widely used in industry, for example in the role of coagulant in water and wastewater treatment and some industrial units of paper production.
The chemical structure of this non-flammable material is as follows:
One of the most important uses of white alum is drinking water and wastewater treatment, which can treat up to 99% of water impurities.
In the agricultural industry as a fertilizer or additive that adds soil can greatly help improve plant growth and development. Shanghai Chemex is one of the most reputable manufacturers of this chemical in the world.
In this text, we try to acquaint you more with this non-flammable substance and its properties and applications.
Physical and chemical properties of aluminum sulfate:
The chemical and physical properties of this mineral salt compound are as table follow:
|Molecular weight (g/mol)||342.2|
|Melting point (°C)||770|
|Solubility in water||Soluble|
Synthesis and production:
Methods of producing aluminum sulfate can be divided into two general categories, which we will describe in the following:
In the first method, this material can be obtained by reaction of sulfuric acid with waste materials of aluminum factories. The product of this process is a gray powder that contains a percentage of white alum with a relatively large number of impurities, in some industries such as zinc and or carton manufacturing industries that do not require high purity of this material, it uses this material without purification.
In the second method, which is more common, water-diluted sulfuric acid is reacted with its hydroxide or its soil to produce this non-flammable material. This method usually has a high production speed and consumes less hydroxide, which is much more economical and it is also better than the first method in terms of quality.
Application and usage:
The uses of aluminum sulfate can be very wide, and we will become more familiar with the most important ones in the following text:
Application of aluminum sulfate in water and wastewater treatment industry:
This mineral chemical is an important material in the water treatment industry that is used to clean, clarify and increase the water quality of pools and lakes.
Alum particles purify and clarify the water in this way:
A certain amount of alum is added to the water, the colloidal particles and impurities in the water are bonded by the alum, forming large particles, settling, and not passing through the filtration filter.
This mineral salt can easily remove up to 99% of impurities from water.
Consumption of Aluminum sulfate in the paper industry has many benefits for the manufacturers of this industry. White alum makes the adhesion of dough materials more and better and prevents damage to paper fibers and increases the strength and quality of manufactured papers.
In the dyeing industry, it can play the role of a color stabilizer on the fabric.
The use of white alum in agricultural industries as agrochemical can significantly reduce soil acidity and make the soil of gardens and agricultural lands more fertile. This reduction in acidity is due to the hydrolysis of this salt and the formation of aluminum hydroxide precipitates and dilute sulfuric acid solution.
Some ornamental plant growers use this chemical to change the color of their flowers.
Aluminum potassium sulfate and another form of alum, ammonium sulfate, are among the most widely used antiperspirants. Due to the antibacterial properties of aluminum sulfate, this material is used in the production of some antiperspirants. Alum sulfate is also used in many countries to treat over-definition. This non-toxic chemical is used as a shrinking agent in blood clotting pens to prevent bleeding from small incisions.
This white crystal is also used to control the growth of algae in ponds, lakes, and waterways. This white crystal is also used in the production of leather, fertilizers, soap making, pharmaceuticals, and the production of chemical catalysts.
Generally, the acidity of Aluminum sulfate is low and as a result, it has poor corrosion. Therefore, it is better than the pipes, fittings and all the containers that are in the vicinity of this material are made of plastic, fiberglass, stainless steel, or other resistant materials.
This non-toxic chemical should be stored in a cool, dry place in a multi-layered compartment so that it does not mix with other materials. The high temperature causes this chemical to lose its crystalline state and become leachate and the crystals to stick to each other.
Packaging and storage:
The above composition should be stored in a cool and dry environment and closed containers. Its solution is corrosive, so it is recommended that containers, pipes, and fittings that are adjacent to the solution are made of plastic, fiberglass, steel. Stainless or other acid-resistant materials.