System and method for on-line monitoring and control of heavy metal contamination in soil washing process
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United States of America Patent
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May 9, 1995
Issued Date -
N/A
app pub date -
Jun 17, 1992
filing date -
Mar 1, 1991
priority date (Note) -
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Abstract
The concentrations of residual heavy metal contaminants in the particulate material in a slurry produced in a particulate material washing process are monitored on-line and can be used to control the washing process. In alternative embodiments of the invention, x-rays, thermal neutrons or laser beams are directed at the slurry as it flows through a flow cell to induce emission of secondary x-rays, gamma rays or light, respectively, characteristic of the heavy metal contaminants and constituents representative of the solids contents of the slurry. These characteristic energies are measured and used to determine the concentration in ppm of the residual heavy metal contaminants in the particulate material within the slurry.
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