Abstract

LOPEZ, Jorge Miranda; GRESESQUI MEDINA, Wilmer  and  SAM PALANCO, Ciro. Procedures of improvements in the sedimentation of the slurry leached in the HPAL technology, with the previous identification of the quality of the ores and use of additives. RTQ [online]. 2021, vol.41, n.2, pp.401-425.  Epub July 30, 2021. ISSN 2224-6185.

Frequently crisis of settling crisis of the leached slurry in the technology High Pressure Leaching of Laterites ores, is due to big existent differences among the geochemistry and mineralogical characteristic of the solid that integrate these, in periods of crisis, with regard to normal periods of settling. Also for the increment of mineralogical phases of silicates of magnesium of diverse grades of thermal decomposition and the transformations in the bark of elements at different evolutionary levels in different sectors of the location. Moreover, to the transformations of the solid inside the leaching out reactors to high pressure, causing diverse behaviors of the clarification and densification process of the leached slurry and consequences, affectations in the operability of the process and recovery of the nickel. Results of realized works shown in 2006 and 2019 that represent alternative of how to mitigate or to eliminate these affectations, just by certain addition compound to the fed slurry, with range of 20 up to 80 g/t, in the formation of mineralogical structures phases inside the leaching out reactors. Previous use, of a new of diagnostic of the quality of the ores to process that identify the technological mineralogy at low analysis cost. Based on an integral of calculation, developed in the Project favored by the Cuban Fund of Technological Innovation in the year 2017 - 2018, this it will allow to estimate the operability of the process previously, and of this, the program derived which fed slurry will be necessary addition and which not.

Keywords : Technological or applied mineralogy; preservatives or additive of made up of copper; potassium-chromium; clarification crisis and densification crisis of the leached slurry; pressure leaching of nikeliferous laterites with sulfuric acid.

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