Aluminum sulfate, also known as alum stone powder (industrial grade), is an inorganic compound with the chemical formula Al₂ (SOSO)₃, and its common form is octahydrate (Al( (SOSO)·*18HOO), with a relative molecular weight of 342.15 (anhydrous) and 666.43 (octahydrate).Aluminum sulfate is odorless, slightly sweet and astringent in taste. The substance is a white crystalline powder, granular or colorless transparent crystal. Common forms include powdered, granular, and octahydrate crystals.It is easily soluble in water. After dissolution, the aqueous solution is weakly acidic, with a pH value of about 2.5-3.5, slightly soluble in ethanol, and insoluble in organic solvents such as ether and acetone.It is stable in the air. When aluminum sulfate octahydrate is heated to 86.5℃, it loses its crystallized water and becomes anhydrous aluminum sulfate. Continued heating to high temperature will decompose to produce alumina and sulfur trioxide. It needs to be sealed and stored in a cool and dry place, away from alkaline substances, to prevent moisture absorption and agglomeration.In industrial production, it is used in water treatment, papermaking, printing and dyeing, leather, chemical industry and other fields. It is used as a coagulant, sedimentation agent, gluing agent, and decolorizing agent. It is also used in drinking water purification, wastewater treatment, paper gluing and other processes.Its excellent coagulation performance and precipitation effect can efficiently purify water quality in the field of water treatment, and improve the strength of paper in the field of papermaking. It is widely used.

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Application Description

1. Used as a core coagulant in the field of water treatment, it is used for drinking water purification and industrial wastewater treatment (such as printing and dyeing wastewater, papermaking wastewater, electroplating wastewater, etc.). It can quickly adsorb suspended particles and colloidal substances in the water, form large floc sedimentation, and remove COD, BOD, chromaticity and some heavy metal ions from the water. The purification effect is significant, the cost is low, and it is suitable for all kinds of water quality.
2. It is used as a gluing agent, retention aid and filter aid in the paper industry. It is used in the paper production process and can be used in conjunction with rosin to improve the water resistance, strength and smoothness of the paper, reduce the water permeability of the paper, and reduce fiber loss. , Improve paper production and quality, and reduce paper-making costs.
3. Used as a decolorizing agent and mordant in the printing and dyeing industry, it is used in the treatment of printing and dyeing wastewater. It can effectively remove dyes, pigments and suspended solids from the wastewater, reduce the chromaticity and pollutant content of the wastewater, and make the wastewater meet the discharge standards. At the same time, it is used as a mordant to assist dyes to color evenly on the fabric and improve dyeing fastness.
4. It is used as a tanning agent and ash removal agent in the leather industry. It is used in the leather processing process to tightly combine leather fibers, improve leather softness, toughness and wear resistance, remove lime impurities from leather, improve leather feel and color, and help produce high-quality leather products.
5. In the chemical industry, it is used as a raw material intermediate for the production of alumina, aluminum hydroxide, alum and other chemical products. It can also be used as a catalyst and desiccant. It is widely used in chemical synthesis, gas drying and other scenarios. It is one of the important basic inorganic chemical raw materials.
6. It is used as a food additive in the food industry (limited use), as a coagulant and clarifying agent, and in the processing of soy products, starch products and other foods. It can make the food have a uniform texture and better taste. At the same time, it can be used for the clarification treatment of juice and beer to remove suspended impurities in the liquid.
7. It is used as a waterproof agent and coagulant in the building materials industry. It is used in the production of cement, concrete, wall materials, etc. It can improve the water resistance, solidification speed and strength of building materials products. At the same time, it is used for wall alkali removal, water softening, and improving the performance of building materials.
8. It is used as a chemical reagent in the laboratory, as a coagulant, precipitant, and acidity regulator. It is used in experimental operations such as chemical analysis, water quality testing, and organic synthesis. It can also be used to prepare aluminum salts and calibrate pH meters to assist in the smooth progress of various experiments.