Chemtrade is one of North America's largest suppliers of sulphuric acid, spent acid
processing services, inorganic coagulants for water treatment, sodium chlorate, sodium nitrite, sodium hydrosulphite and phosphorus pentasulphide.
The new plant will allow Huntsman to use a wider range of feedstock to produce its TIOXIDE[R] and ALTIRIS[R] pigments, reduce the generation of gypsum in the process, and convert spent acid
from TiO2 pigment manufacturing into iron sulfate products for the water treatment, animal feed, and cement markets.
For example, automatic cycling on etch line operations, which centres on control of the acid bath to replace spent acid
with fresh, is typical of the organisation's work in this area.
Cullo: OK International released a report in June indicating that in 2010 more than half a billion pounds of spent acid
lead batteries were shipped from the United States to substandard recycling facilities in Mexico.
The offerings of DuPont Clean Technology include Spent Acid
Regeneration (SAR), and On-site Sulfuric Gas Regeneration (SGR).
However, for mills with high barium levels, lowering the pH in the first chlorine dioxide stage will increase the risk of barium sulfate scale, particularly if the mill uses spent acid
for pH control in the bleach plant.
The work entailed refurbishing the existing units and construction of a new 1,300 b/d MTBE plant, a 4,500 b/d alkylation unit as well as spent acid
regeneration and LPG pre-treatment units.
The foundry's coreroom utilizes a tower unit to scrub the air of spent acid
and gas catalyst and remove residual odor.
At the end of the alkaline cleaning step, the noncaustic cleaner is discarded and can be me mixed with the spent acid
solution for pH neutralization.
The spent acid
will be replaced and the rejuvenated solution recycled repeatedly through the buried copper oxide.
The uranium-rich acid is then pumped to the surface where the uranium is recovered, and the spent acid
is pumped into underground caverns.