Apparatus and process for extracting metal values from foundry sands
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United States of America Patent
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Dec 27, 1994
Issued Date -
N/A
app pub date -
Dec 3, 1993
filing date -
May 26, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and process for extracting simultaneously metal values from foundry sands, said apparatus comprising a thermostated column which is in flow communication with a controlled air supply source and with a heating system arranged to keep said column at a predetermined temperature; said column is adapted to receive the necessary components to form an aqueous pulp from which the metal values are to be extracted, and has a device for finely dividing the airflow coming from the supply source in order to obtain a suitable suspension and homogenization of said pulp. In turn, the process comprises the steps of introducing into the thermostated column certain reagents, distilled water and pulverized foundry sands which form an aqueous pulp and processing it for a predetermined period of time under controlled temperature and airflow and pH conditions, after which the pulp is removed from the column and heated again at a temperature and for a period of time different to the above mentioned ones and it is finally filtered to obtain a metal containing solution.
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