Process for the separation of components of scrap storage batteries
First Claim
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1. A process for the separation of scrap lead storage batteries and parts thereof in three parts, namely metallic components, paste and inactive material, essentially comprising:
- emptying from the batteries their sulphuric acid content;
then crushing the batteries into pieces of sizes between 2 and 15 cm, apart from the paste which is detached;
heating the pieces and paste at 35°
-50°
C., while tumbling them, until the paste reaches a humidity content of 2-7%, thereby neutralizing the residual acidity of the paste;
then separating and recovering the dry paste from the materials from the preceding step by dry screening said materials using a screen having openings of size in the range of 2 to 30 mm;
then feeding the residual material, substantially free of paste, into a separating zone containing an aqueous suspension of the paste, and having a density from 10 to 100% greater than that of the battery containers, and a pH regulated between 7 and 10, the pH and viscosity of the suspension being regulated by addition of sulphuric acid;
removing as sink the metallic components and as float the inactive material;
draining and washing the sink and float respectively, and recirculating the suspension of paste at the proper density to the separating zone.
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Abstract
A process for separation of the components of scrap lead storage batteries including crushing, and then heating the pieces while tumbling, dry screening the paste from the residual materials which are fed to a sink-float apparatus whose fluidized pulp comprises a liquid suspension of battery paste. The pH and density of the pulp are regulated in the pH range of 7-10 by addition of sulphuric acid. After sink-float separation the drained and washed materials are recovered and the pulp and wash liquid are recycled back into the system.
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Citations
5 Claims
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1. A process for the separation of scrap lead storage batteries and parts thereof in three parts, namely metallic components, paste and inactive material, essentially comprising:
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emptying from the batteries their sulphuric acid content;
then crushing the batteries into pieces of sizes between 2 and 15 cm, apart from the paste which is detached;heating the pieces and paste at 35°
-50°
C., while tumbling them, until the paste reaches a humidity content of 2-7%, thereby neutralizing the residual acidity of the paste;then separating and recovering the dry paste from the materials from the preceding step by dry screening said materials using a screen having openings of size in the range of 2 to 30 mm; then feeding the residual material, substantially free of paste, into a separating zone containing an aqueous suspension of the paste, and having a density from 10 to 100% greater than that of the battery containers, and a pH regulated between 7 and 10, the pH and viscosity of the suspension being regulated by addition of sulphuric acid; removing as sink the metallic components and as float the inactive material; draining and washing the sink and float respectively, and recirculating the suspension of paste at the proper density to the separating zone. - View Dependent Claims (2, 3, 4, 5)
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Specification