ALUM
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ALUM 속성
안전
ALUM C화학적 특성, 용도, 생산
정의
A type of double salt. Alums are double sulfates obtained by crystallizing mixtures in the correct proportions. They have the general formula:M2SO4.M';2(SO4)3.24H2O
Where M is a univalent metal or ion, and M′ is a trivalent metal. Thus, aluminum potassium sulfate (called potash alum, or simply alum) is
K2SO4.Al2(SO4)3.24H2O
Aluminum ammonium sulfate (called ammonium alum) is
(NH4)2SO4.Al2(SO4)3.24H2O
The name ‘alum’ originally came from the presence of Al3+ as the trivalent ion, but is also applied to other salts containing trivalent ions, thus, Chromium(III) potassium sulfate (chrome alum) is
K2SO4.Cr2(SO4)3.24H2O.
농업용
Alum is a double sulphate of a monovalent and trivalent salt.Alum acts as a flocculating agent. It is used in sewage treatment and in purification of drinking water. Alum is also used in the preparation of mordant and as a fireproofing agent.
Aluminum sulphate is sometimes erroneously called alum in some industries (such as in the paper industry).