Estudo sobre a flotação de silicatos em coluna para o processo de concentração da apatita

by Monteiro Silva, Alessandra Achcar

Abstract (Summary)
The phophate is an indispensable nutrient to the vegetable and therefore animaldevelopment, in Brazil, the mineral wich contains phosphate is the apatite. The progressivecontent reduction of the ore deposits already discovered and being explored, allied to thegrowing demand for food, turns imperative the phosphate ore processing in many ways of theprocessings, mainly in that it says respect to the decrease of contaminants minerals. Theflotation process is the main technology applied for the concentrate the apatite mineral, whichpassed for constants developments in the last decades being distinguished the flotationcolumns to the improvements of the concentrates gotten and economy in the projectinvestments. Because an increase of the siliceous concentration in the phosphate rock of theBarreiro deposits (Araxá-MG), the objective of this work is developing the flotation ofsiliceous in column for the process of concentration the apatite. In this context, to quantify theeffect of the operational variables as well as of the dosage of reagents in the grade of SiO2 inthe product of deep and the recovery of P2O5 in the concentrate, a time that the flotation ofsiliceous represents in a stage of purification of the ore. In view of the gotten results, a globalstatistics analysis and a canonic analysis were made in order to optimize the operationalconditions. The use of the collector Flotigam EDA showed itself suitable for siliceousflotation in column for the apatite concentration process. The best result carried through thetests realized in this work was a concentrate of flotation with recuperation of 6 wt. % P2O5,and product with grade of 8.12 wt % SiO2. The excellent operational conditions in theexplored band was: air flow between 40 e 60 L/h, washed water flow of 0,40 L/min, 0,39L/min of recycle flow, collector dosage of 450 g/t, depressor dosage of 550 g/t and collectorconditioning time of 10 min for 340 g of ore. The results obtained from the benches columnhad shown the possibility of siliceous flotation in a previous stage of the apatite flotation.
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Marcos Antonio de Souza Barrozo; Carlos Henrique Ataide; Rogério Contato Guimarães; Wanderley Pereira de Oliveira

School:Universidade Federal de Uberlândia

School Location:Brazil

Source Type:Master's Thesis

Keywords:Apatita Flotation column Apatite of siliceous


Date of Publication:06/24/2005

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