OPTIONS FOR THE TREATMENT AND DISPOSAL OF THE SPENT PICKLE LIQUORS FROM THE IRON INDUSTRY
The iron finishing industry in Mexico, employs sulfuric acid as a pickling agent to clean materials from scale, rust and dirt. Generaliy the industries do not treat or recycle the spent pickle liquors, and in most of the cases these acids are discharged directly to the drainage system acidifying the...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | México |
| Institución: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Revista Internacional de Contaminación Ambiental |
| Idioma: | español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/21108 |
| Acceso en línea: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/21108 |
| Access Level: | acceso abierto |
| Palabra clave: | spent pickle liquors alternatives of solution licores ácidos gastados tratamiento de residuos industriales industria de acabado de hierro |
| Sumario: | The iron finishing industry in Mexico, employs sulfuric acid as a pickling agent to clean materials from scale, rust and dirt. Generaliy the industries do not treat or recycle the spent pickle liquors, and in most of the cases these acids are discharged directly to the drainage system acidifying the water streams. Alternatives of solution for this poliution problem were reviewed in the context of the Mexican industry,and a particular case was studied through the characterization of its spent pickle liquors. Proposed altematives are: neutralization, recycling and reuse (as reducing agent or saline-sodic soil reclamation agent) with no prior treatment of'the spent liquors. Recycling, either with H2SO4 or HC1, is considered as the optimal solution.Analysis of the spent pickle liquors of the case study indicate an acid concentration of 5.7% w/v* and an FeSO4•7H2O concentration of 27% w/v, with coefficiients of variation of 15 and 8% respectively. These contents are in the low range of those found for similar industries in developed countries. Other metals are present in the mg/L level: Mn, Na, Zn, Ca, K, Pb, Al, Cr, Ni and Mg. These metals should be considered as posible impurities in the end-products of the different proceses proposed. |
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