Mercury Recovery from the brine sludge By Detoxification of Hazardous Waste containing Mercury and its compounds By Common Laboratory Reagents and solvents

Released on = February 15, 2006, 10:45 pm

Press Release Author = Ms. Papita Saha

Industry = Chemicals

Press Release Summary = Mercury ions in the environment are non-biodegradable and
once ingested, metal ions accumulate into the organs which often-resulting death.
Mercury is highly toxic for human being. In our country the brine sludge is kept in
the large pits without any treatment or protection. As a result at the time of rain
water, mercury and its salts mixed with the surface living beings. The kidney is the
main target organ for inorganic mercury. Mercury and its salts are so toxic that it
causes tremor, irritability, slurred speech, blindness, erosive bronchitis and
pneumonities. The liver, kidney, brain, heart, lungs and muscle tissues retain
Mercury (II). It is a protoplasmic poison6 and damages the central nervous systems.
The main objective of this work is to find out a suitable and appropriate
technology for effective detoxification of these solid waste to an innocuous solid
so that they can be discharged safely in a municipal landfill as well as we can
recycle mercury for the preparation of amalgam.

Press Release Body = The major consumer of mercury is Chloro - Alkali Industry as
these types of Industry using the conventional Mercury Cell process where a large
quantity of Solid waste containing elemental Mercury and Chlorinated mercury
compounds are generated. Disposal of these solid waste are very difficult throughout
the world as well as India also. Primary experiment shows that the sludge disposed
by the plants contain around 130 mg/kg of total mercury. To extract mercury from the
sludge, different reagents like Soap solution, Hot water, Hydrochloric acid,
Chlorine gas etc were used and detailed investigations were carried out. From the
aspects of economic consideration and effectiveness of mercury recovery, chlorine
treatment was suitable over the other. By chlorine treatment about 65% of mercury
could be recovered in normal temperature from the sludge. Using Hydrochloric acid
about 76% of mercury could be recovered but chlorine treatment process would be both
cost effective and technically feasible for commercial purposes as Chloro - Alkali
Industry produced chlorine and it was rejected as istage in the Chloro - Alkali

Web Site =

Contact Details = Papita Saha.
Kolkata- 700049, India.

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