ANALYTICAL GRADE SALT
ULTRA PURE
99.740%
.
Khewra
Salt Mines is a salt mine located in Khewra in Jhelum District of Punjab, Pakistan, about
160 kilometers from Islamabad (capital city of Pakistan) and 260 kilometers from Lahore. Khewra
salt mine has estimated total of 220 million tons of rock salt deposits. Sodium chloride is
composed of two elements, sodium and chlorine. The percentage of these elements is Na 39.4%,
Cl 60.6% in a unit formula.
The rock salt is not always found in pure state. Calcium sulphate and magnesium sulphate are the
major impurities present in industrial salt. Impurities are mostly mechanical such as droplets of
brine, gas bubbles, and also inclusions of clay and organic matter, gypsum, KCl, MgCl2, CaCl2,
Na2SO4, MgBr2, MgI2, and MgSO4. This method will allow production of analytical grade sodium
chloride at a lower cost, and allow mass production.
Three step process was employed for the preparation of
analytical grade salt.
•Crude Brine containing 310 g/l was prepared and
recystallized to decrease the concentration of impurities.
After recrystallization, it was dried using centrifuge and
Recrystallization oven.
Highly Cost
Effective
Allow mass
production
BENEFITS
Primary
Treatment
Secondary
Treatment
•The primary Treatment was employed using Ba2CO3, NaOH
and Na2CO3. which removed Ca+2, Mg+2 and SO4-2 upto ppm
level.
•Concentration of metals present in traces were removed
up to ppb level during this step.
•Finally ion exchange technique was used was used to
remove Ca+2, Mg+2 upto ppb level and SO4-2 below 10 ppm.
Time
saving
Three step
process
Analytical
grade
99.740%
pure NaCl
Distilled
Water
Distilled
Water
Ba2CO3
Rock Salt
Filtered
Brine
Evaporation &
Recrystallization
Recrystallized
NaOH
Na2CO3
Strong Basic
Anion Resin
Weak Acid
Cation Resin
Settling
Heated
at 90 oC
45 to 60 min
Redissolved
NaCl
Flucculant
pH upto 4
Brine free from
CO3-2 & OH-
dil. NaOH
pH upto 7
Brine free from
Impurities
Heated
Crystallized
Dried
Crystalline NaCl
(Analytical Grade)
APPLICATIONS
Biological Uses
• DNA Isolation
• Pharmaceutical Industry
Chemical Industry
• Synthesis of caustic soda, chlorine gas, soda
ash, sodium peroxide
Food Industry
• For taste and in food preservation
PRINCIPAL INVENTOR:
Muhammad Akhyar Farrukh
UAN: 042-111-000-010 ext: 263
[email protected]