PTMA Aluminum Sulfate Water Treatment Agent
Product Description
Common aluminum salt
Aluminum sulfate is a one of common aluminum salt, prone to hydrolyze, aqueous solution is acid. Added to the solution of soluble carbonates or sulfides will lead to complete hydrolysis:
（1）2Al3++3CO2-3+2H2O=2Al(OH)3↓+3CO2↑ （2）2Al3++3S2-+3H2O=2Al(OH)3↓+3H2S↑
Produce a white flocculent precipitate aluminum hydroxide sediment, when heated it expands violently, becomes spongy substance. Calcined to red heat, then it will be decomposed into sulfur trioxide and alumina.
Aluminum sulfate solution and potassium sulfate solution were mixed, to crystallize, to obtain a new kind of salt called potassium aluminum sulfate K2SO4 · Al2 (SO4) 3 · 24H2O, this salt is called complex salt, also known as aluminum potassium alum, commonly known as alum. From the composition point of view, it is formed by the adduct of two simple salt, is not a simple mixture of the two salt, but the compound of the same crystal structure, certain composition. The difference between complex salt and complexe is that in the solid state or solution complex salt presents simple ions, without complex ions.
Aluminum sulfate and other soluble sulfate, can also form another double salt, the formula of which is M2ⅠSO4MⅡSO4 · 6H2O and MⅠ2SO4M2Ⅲ (SO4) 3 · 24H2O. Where MⅠ typically is NH + 4, Na +, K +, Rb +, Cs +, Tl +.MⅡ1 is Fe2 +, Co2 +, Ni2 +, Zn2 +, Cu2 +, Hg 2+; MuⅢ1 is Fe 3+, Cr3 +, Al3 +, etc. This type of complex salt, collectively known as alum, for example: the molar salt (NH4) 2SO4 · FeSO4 · 6H2O, magnesium potassium sulfate K2SO4 · MgSO4 · 6H2O, chromium potassium sulfate K2SO4 · Cr2 (SO4) 3 · 24H2O, sodium alum Na2SO4 · Al2 ( SO4) 3 · 24H2O, alum, ammonium (NH4) 2SO4 · Al (SO4) 3 · 24H2O, etc.
These classes of alum, solubility in water is much smaller than their corresponding sulfates composition, and thus the crystallization from solution, it is easy to get a more complete crystal particles, easily purified.
This step of preparing alum is often used for purification of aluminum sulfate or preparation of relatively pure aluminum compound. The class of Alum in the industry has a wide range of uses, alum can be used to clean drinking water, also used for tanning leather, printing and dyeing, papermaking and other industries. Aluminum, aluminum oxide or aluminum hydroxide with sulfuric acid can be prepared for aluminum sulfate.
Physical and Chemical Properties
Colorless or white crystals.
Odorless, slightly sweet taste.
Because of containing iron etc, industrial product looks like a yellowish-green, tastes sour.
It was Stable in the air, heated to 250 ℃ to lose crystal water, when heated above 700 ℃, begin decompose into aluminum oxide, sulfur trioxide and water vapor, etc.
Soluble in water, aqueous solution is acidic. Al2 (SO4) 3 + 2H2O → Al2 (SO4) 2 (OH) 2 + H2SO4, when hydrate were heated, violently swell and become spongy, when heated to a red heat, it decomposes into sulfur trioxide and alumina. Flocculent or sponge-like Al (OH) 3 has a strong adsorption capacity, good absorption of pigments and fibers, and thus used as a mordant in dyeing industry, also used to purify drinking water. In addition, in the paper industry, it can added to the pulp with rosin simultaneously for fiber bonding.
Aluminum sulfate has Anhydride and a variety of patterns of hydrate existing (16,18,27, etc). Among aluminum sulfate, the more stable is anhydrous aluminum sulfate [1] and 18 hydrated aluminum sulfate [2]. [1] is a colorless orthorhombic crystals, shiny, or white crystalline powder. Relative molecular mass is 342.15. The relative density is 2.71. Gradually heating to melt, it begins to lose crystal water at 250 ℃, decompose at 770 ℃. The refractive index is 1.47.
Dissolved in water, slightly soluble in ethanol, aqueous solution is acidic. Solubility in water: 37.9 at 0 ℃, 38.1 at 10 ℃, 38.5 at 25 ℃, 38.9 at 30 ℃, 40.4 at 40 ℃,44.9 at 60 ℃, 48.8 at 70 ℃, 89 at 100 ℃. [2] is a colorless monoclinic needles. Relative molecular mass is 666.43. The relative density is 1.69 (17/4 ℃). decompose at 86.5 ℃. Dissolved in water, not soluble in ethanol. The solubility in water is 86.9 at 0 ℃, 1104 at 100 ℃. Aqueous solution is acidic due to hydrolysis.
Aluminum sulfate easily absorb water to agglomerate, use plastic bags lined with plastic bags of glass for packaging. Storage and transportation should prevent rain and damp.
1, All levels of refined aluminum sulfate can be used for producing all levels of precipitation paper sizing agents, class A, B and C is used for water purification, in which arsenic (AS2O3) content should be not more than 0.01%.
2, Aluminum sulfate size: all through the 10 mm mesh sieve, among which the 8 mm sieve fine is not less than 98%, but can also be made bulk product according to user`s requirements.
3, Appearance and color of refined aluminum sulfate is white.
4, All levels of crude aluminum sulfate can be used for water purification, aluminum sulfate used for purification can not be produced by waste acid toxic substances.
5, Aluminum sulfate used in paper sizing, Al2O3 content should be more than 12%, iron content less than 0.2%, insolubles should be not more than 0.5%. Fine paper production requires iron content of aluminum sulfate should be less than 0.08%, this kind of aluminum sulfate is called iron-free aluminum sulfate.
Aluminum sulfate is one of the components of Nuclear Fast Red solution.It is a coagulant used for arsenate removal from water.
Aluminum sulfate has been used in the preparation of the nuclear-fast red solution for red nuclear counterstaining in histology and cytology protocols. It may be used as a catalyst for the conversion of lactic acid to acetaldehyde via decarbonylation.
Aluminum sulfate may be used to form a porous composite adsorbent with graphene hydrogel to be used for fluoride removal from water.