Acid effluents from the leaching of sulphide minerals could be a liability that will return part of the cost of treatment when economic elements such as Fe and Mn are obtained. In this practical part of the neutralization with lime, it is precipitated as ferric hydroxides (III) and manganese (IV) hydroxides the pH must be controlled for each stage. Although the pH initially started at 2.2, an effluent has been achieved according to the standards established for its discharge or reuse. Dry hydroxides can reach very profitable levels, making the treatment sustainable and also clearing metals from the sludge that commonly goes to the tailings.

Health facilities generate thousands of tons of waste each year, including non-hazardous waste, hazardous substances, radioactive substances, and infectious substances. This number is increasing as our country continues to develop, as is public concern about its negative effects on human health. Through this study, an adequate management of hospital waste from its origin to its final disposal is suggested, focusing on the correct segregation of waste, since this will minimize the impact. In each medical facility it is necessary to establish a biological treatment system for contaminated waste; in accordance with the provisions of the Hygiene Technical Reference: "Management and total management of solid waste in health establishments, medical support services and research centers", through which the physical, chemical or biological properties of the biologically contaminated waste, to re...

The present research study demonstrates that the recovery of gold and zinc in gold-containing marmatitic zinc ores is feasible. The recovery of these metals was analyzed by factorial experimental designs, using the reagents: CuSO4, AR-3418 and AR-1242 as independent variables, while all other variables remained constant. As a result of the research, a mathematical model was obtained for the recovery of gold and zinc, performing the adjusted factorial design analysis, as indicated: Recovery of gold (Au) = 83.40+ 0.00600 CuSO4 + 0.110 AR-3418 + 0.035 AR-1242 + 0.000313 CuSO4 * AR 3418+ 0.000275 CuSO4 * AR-1242- 0.00800 AR-3418 * AR-1242 - 0.000011 CuSO4 * AR-3418 * AR-1242. Likewise, the recovery of zinc (Zn) = 73.14 + 0.0100 CuSO4 + 0.132 AR-3418 + 0.051 AR-1242 + 0.000164 CuSO4 * AR-3418 + 0.000131 CuSO4 * AR-1242 - 0.00811 AR-3418 * AR-1242 - 0.000004 CuSO4 * AR-3418 * AR-1242.