Patents Used for Treating Solid Granular Wastes, Coming from The Automotive and Mining Industry _ Crimson Publishers

Patents Used for Treating Solid Granular Wastes, Coming from The Automotive and Mining Industry by Torres JV in Integrative Journal of Conference Proceedings


Granular solid residuals are produced by different industries in Mexico. Some of these are considered dangerous because they are stored in open areas contaminating and affecting the flora, fauna, and aquifers, and occasionally to the human being. These solid residuals coming from mines and diatomaceous earth are known as jales (náhualt derivated from xalli, it means sand). The jales have a high content of cyanide and heavy metals. These high contents are commonly out of the limits permitted by the Mexican standards. On the other hand, the “diatomita” (diatomaceous earth) is not as dangerous as the “jales”, however, this needs a treatment to eliminate the occluded organic material. This is normally used by producers of gelatin, antibiotics, industrial grease and oil, sugar refining, etc.

The leaching process of metals using the sodium cyanide was introduced in 1887 Li, 1993. This revolutionizes the techniques to obtain gold and silver. This is a method usually employed in the world to recover metals. Two international patents were obtained by developing equipment and a process to extract toxic metals and wastes from foundry sands Vite, 1994a, 1994b. In addition, a national patent was achieved by the leaching of heavy metals from foundry sands Vite, 1997. The mechanical properties of these ceramic materials, such as the compressive strength were determined in accordance to ASTM C170-50 and ASTM C-36 standard. The results showed that these ceramic materials are lighter and exhibit higher compression strength than conventional materials such as bricks.

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