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Many of salt’s 14000uses are found where you’d expect. Salt sets the dye in fabric
and is used to produce glass polyester and plastics. Salt assists in cleaning gas
and oil wells and is an essential component in the manufacturing of paper, tires,
brass, bleach and case-hardened steel, etc.
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COMMON SALT FOR CHEMICAL INDUSTRIES UNDER IS: 797-1982
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In the considering of the requirements of quality of salt for use in chemical in
industries, two grades have been fixed. While the salt industry easily achieve the
quality of salt grade II. It is rather difficult to attain the grade I quality unless
the salt manufactured is purified by mechanical washery with the use of wet grinding
mill and centrifuge In particular, it may mentioned that even the salt manufactured
in the salt works under ideal conditions requires rain wash or artificial wash with
weak brine or fresh water to bring down the magnesium content to the requirement
of chlor-alkali industries.
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Characteristics of Grade I, Grade II and Refined in Chlor-alkali Industries
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S.No.
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Characteristics
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Grade I
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Grade II
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Refined
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1
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Chloride content (as NaCl) percent by mass, min
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99.5
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98.5
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98.5
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2
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Water insoluble matter percent by mass, max
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0.05
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0.2
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.10
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3
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Calcium salt (as Ca) percent by mass max
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0.03
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0.2
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0.15
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4
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Magnisium salt (as Mg) Percent by mass
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0.01
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0.10
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.010
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5
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Sulphate (as SO4) percent by mass , max
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0.2
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0.6
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0.6
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6
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Iron Compound ppm max
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10
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20
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-
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7
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Iron Compound ppm max
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1
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4
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0.5
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Additional requirement for Grade II salt in explosive and pyrotechnic industry
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S.No.
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Characteristics
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Requirements
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1
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Sulphate
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0.5% Max
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2
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Iron
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10 ppm max
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3
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Akalinity
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0.5 max
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Additional requirement for Grade II salt in Caustic Soda by electronic process
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S.No.
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Characteristics
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Requirements
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a
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Vanadium + Chromium + Molybdenum max.
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0.01 ppm
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b
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Aluminium max
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0.10 ppm
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c
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Other trace metal ( titanium, copper and nickel )
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max 0.01 ppm
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SALT FOR HPDE CURING UNDER IS: 593-1978
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Considerable quality of salt is being used in leather industry for hide- curing.
The main function of salt in this operation is dehydration.
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Characteristics of salt in Hide Curing
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S.No.
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Characteristics
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Grade I
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1
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Chloride content (as NaCl) percent by mass, min
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97.0
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2
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Water insoluble matter percent by mass, max
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1.0
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3
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Metter soluble in water other than sodium chloride, percent by mass max
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2.0
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4
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Alkalinity Percent by mass
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0.5
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5
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Iron Compound ppm max
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100
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The moisture content shall not be more than 6 % by mass. Any one of the following
three preservatives to an extant of not less than 0.5% by mass shall be found in
the material
a. Sodium Pentachlorphenate
b. Sodium Orthophenylphenate
c. Zink Chloride
The Material shall also contain not less than 0.2 % by mass of Kerosene oil as denaturant
The packages shall be closed and marked with name and mass of the material, name
of the manufacturer, batch number and date of packing. The packages shall be marked
with the world “Poisonous, Handle with care”
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SALT FOR DETERGENTS
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Salt finds widespread use in detergents where it fulfils the role of cost effective
filler. Salt used in detergents needs to comply with stringent specifications with
respect to purity, insoluble, Particle size distribution, Calcium content, and appearance
(whiteness). Besides fulfilling its primary role as cost effective filler.
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SALT FOR DETERGENTS
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- Powder flow properties
- Resistance to caking
- Particle size distribution
- Bulk density of powder
- Powder compressibility
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Salt Quality for use in detergents
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- Salt should be white in colour as off-colour salt will have a negative impact on
colour of final detergent colour.
- Narrow Particle size distribution is preferred as this gives dry-mix detergent powders
go good powder flow properties.
- High assay salt is desirable as this results in salt of consistent quality due to
absence of impurities/ unknowns.
- The Hygroscopic nature of salt arises out of its calcium and magnesium content
- Presence of insoluble in salt is undesirable as these impurities could adversely
effect stability of sensitive ingredients in detergents.
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