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Iron-free Aluminum Sulfate Powder

Product Name: Iron-free Aluminum Sulfate Powder
English Name: Iron-free Aluminum Sulfate
Molecular Formula: Al₂(SO₄)₃ · xH₂O (Commonly as Al₂(SO₄)₃ · 14H₂O or Al₂(SO₄)₃ · 18H₂O)
CAS No.: 10043-01-3 (Anhydrous) / 17927-65-0 (Octadecahydrate)
EINECS No.: 233-135-0
HS Code: 2833.2210 (Aluminum Sulfate)

Category :
Iron-free Aluminum Sulfate Powder
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Release time : 2026-01-15

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Detailed Description

Product Name: Non-Iron Aluminum Sulfate

Product Code: AL-SO4-001 (Adjustable per enterprise coding protocol)

Execution Standard: GB/T 3151-2002

Basic Information

Item	Details
Chemical Formula	$\ce{Al2(SO4)3}$ (Anhydrous); $\ce{Al2(SO4)3·18H2O}$ (Octadecahydrate)
Molecular Weight	342.15 (Anhydrous); 666.41 (Octadecahydrate)
CAS No.	Anhydrous: 10043-01-3; Octadecahydrate: 7784-31-8
EINECS No.	233-135-0
HS Code	28332200 (China Customs Tariff Code)

Product Properties & Forms

Type	Appearance & Traits	Physical Characteristics
Octadecahydrate	Colorless to white monoclinic crystals (flake/granule/block) with excellent luster, low impurity content	Density: 1.69g/cm³; Melting point: 86.5℃ (loses crystal water); High hygroscopicity, prone to efflorescence in air
Anhydrous	White fine crystalline powder, good fluidity, high purity	Density: 2.71g/cm³; Melting point: 770℃ (decomposes); Hygroscopic, easy to deliquesce and agglomerate in humid environment
Common Traits	—	Easily soluble in water (aqueous solution is strongly acidic); Insoluble in organic solvents such as ethanol and acetone

Comparison of Product Forms

Comparison Dimension	Powder Form	Flake Form	Liquid Form
Core Component	Anhydrous non-iron aluminum sulfate, industrial grade first-class or higher	Octadecahydrate non-iron aluminum sulfate, crystalline state, low impurities	Non-iron aluminum sulfate aqueous solution (10%-20% common), with minor stabilizers, customizable concentration
Physicochemical Traits	Fast dissolution rate, good fluidity, strong hygroscopicity, easy agglomeration	Moderate dissolution rate, dense structure, weak hygroscopicity, anti-agglomeration	Ready-to-use (no dissolution required), general stability, crystallization-prone at low temperature
Storage Conditions	Sealed & dry storage, away from moisture; Shelf life: 6-12 months	Ventilated & dry area, stackable; Shelf life: 8-15 months	Sealed & light-proof, temperature 5-35℃, no exposure to sunlight; Shelf life: 3-6 months
Application Scenarios	Water treatment, chemical synthesis, high-precision proportioning projects	Papermaking sizing, printing & dyeing mordanting, mass production with general storage	Continuous production lines (e.g., assembly-line water treatment), high-efficiency demand scenarios
Transportation Cost	Low cost (high active ingredient per unit weight, high density)	Medium cost (same as powder, low loss rate)	High cost (high water content, low active ingredient per unit weight, extra packaging)

Core Technical Indicators

Indicator Name	Industrial Grade First-Class	Reagent Grade Analytical Pure
$\ce{Al2(SO4)3}$ Content (Min.)	15.6% (Octadecahydrate)	99.0% (Anhydrous)
Iron (Fe) Content (Max.)	0.01%	0.005%
Water Insoluble Matter (Max.)	0.10%	0.02%
pH Value (1% Aqueous Solution)	2.5~3.5	2.5~3.5
Heavy Metal (as Pb) (Max.)	0.002%	0.001%
Arsenic (As) Content (Max.)	0.0005%	0.0001%

Core Chemical Properties
Acid Hydrolysis: Reacts with water to form aluminum hydroxide colloid and sulfuric acid, presenting strong acidity in aqueous solution, which is the core flocculation mechanism.
Alkali Reaction: Reacts with strong alkalis to generate aluminum hydroxide precipitate (dissolvable in excess strong alkali); Reacts with weak alkalis (e.g., ammonia water) to form stable, non-dissolvable aluminum hydroxide precipitate.
Double Decomposition Reaction: Reacts completely with soluble barium salts to produce white barium sulfate precipitate.
Thermal Decomposition: Decomposes into aluminum oxide, sulfur dioxide and oxygen at high temperature; Stable at room temperature.
Non-Iron Advantage: Extremely low iron content eliminates discoloration risk and avoids catalyzing side reactions, suitable for high-precision applications.
Application Fields
Water Treatment: High-efficiency flocculant for drinking water and industrial wastewater purification; Adsorbs suspended solids, organic substances and heavy metals without causing water yellowing.
Papermaking Industry: Papermaking sizing agent to improve water resistance, tensile strength and smoothness of paper; Also used as retention and drainage aid to enhance fiber retention rate.
Printing & Dyeing Industry: Mordant to strengthen dye adhesion and color fastness; Can be used as fabric antistatic finishing agent.
Pharmaceutical & Food Industry: Reagent grade product for pharmaceutical carriers and food additives (e.g., leavening agent components), complying with national purity standards.
Other Fields: Production of aluminum hydroxide, alum and other chemical products; Concrete early strength agent; Cosmetic astringent.
Safety & Handling Precautions
Operation Protection: All forms are acidic and irritating to skin and mucous membranes. Wear acid-resistant gloves, masks and goggles during operation. Rinse immediately with plenty of clean water in case of contact.
Dissolution Guidelines: Add powder/flake products to room-temperature clean water gradually with stirring; Avoid massive one-time addition to prevent agglomeration. Do not dissolve with alkaline substances in the same tank to avoid inactivation.
Liquid Handling: Stir liquid products evenly before use. If crystallization occurs, dissolve in warm water bath (≤50℃); High-temperature heating is prohibited.
Storage Taboos: Do not store with strong alkalis, oxidants or food chemicals. Keep powder/flake away from water sources; Prevent liquid leakage and pollution.
Proportion Control: Proportion powder/flake by solid content, and liquid by actual concentration to avoid performance failure (e.g., incomplete flocculation, uneven sizing).