Tatiani Santos’s research while affiliated with Centrais Elétricas do Norte do Brasil S.A and other places

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Publications (6)


Automatic Control of Drum Filters Operation
  • Chapter

January 2016

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27 Reads

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Lucélia Moraes

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Tatiani Santos

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[...]

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Juarez Borges

Red mud is the principal waste of Bayer process and must attempt to quality parameters, such as caustic concentration, to not damage disposal environment. In Hydro Alunorte, drum filtration is used for dewatering and washing red mud with filter cloths that retains the cake formed by red mud, recovering part of caustic soda, which returns to the process. The aim of this work was to reduce the consumption of filter cloth with improvement of operation and maintenance by drum filters. After a study of equipment performance, process parameters were adjusted and an automatic control of the drum filter operation was developed, with a complex control loop. The recovery of caustic soda increased and were observed gains on filter cloths durability which means about 40% of reduce in operation costs.


Improvement on the Operation Management System of Vertical Pressure Filters

January 2016

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23 Reads

Polishing filtration is one of the most crucial step of the Bayer process present in alumina refineries. In Hydro Alunorte, five of the seven production lines use Vertical Pressure Filters (VPF) in the polishing filtration and an excessive consumption of filter cloth was observed. The aim of this paper is present the improvements in the VPF operation management system. The actions were done on the process parameters in order to gain durability of filter cloths used in VPF filters. Process control variables, such as solids in the filtered pregnant liquor, filtration rate and VPF pressure were evaluated and become the limiters for programming the filters operation cycles. An automatic preparation control of the caustic wash solution, used to wash filter cloth at the end of filtration cycle, was also done. The useful life of filter cloth increased by 25% and it means about 12% of reduce in operation costs.




Tests with New Flocculant for Red Mud Decanting in Alunorte

May 2012

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11 Reads

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2 Citations

To produce alumina with high quality, competitive costs and high efficiency on caustic recover with low flocculant consumption has been a challenge for the filtration area in Alunorte. This area has 3 chains each with 5 washers for 7 production lines where together, handles about 4,4 Mtpy of red mud. Specifically at production lines 6 & 7, the washer chain has only high rate settlers and apart from that, they receive bauxite from Mineraçâo Bauxita de Paragominas. The combination of these two aspects results on lower density in the settler underflows. One of the actions to increase underflow solids content was to replace the conventional polyacrylate flocculant by another one which could be capable to increase the density in the washer underflows. Among other trials were gotten good results from the use of FLOMIN OL 99 polymer in lab tests as well as in the plant. The discussion of these results is the main propose of this paper © 2012 by The Minerals, Metals, & Materials Society. All rights reserved.


Tests with New Flocculant for Red Mud Decanting in Alunorte

January 2012

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10 Reads

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2 Citations

To produce alumina with high quality, competitive costs and high efficiency on caustic recover with low flocculant consumption has been a challenge for the filtration area in Alunorte. This area has 3 chains each with 5 washers for 7 production lines where together, handles about 4,4 Mtpy of red mud. Specifically at production lines 6 & 7, the washer chain has only high rate settlers and apart from that, they receive bauxite from Mineração Bauxita de Paragominas. The combination of these two aspects results on lower density in the settler underflows. One of the actions to increase underflow solids content was to replace the conventional polyacrylate flocculant by another one which could be capable to increase the density in the washer underflows. Among other trials were gotten good results from the use of FLOMIN OL 99 polymer in lab tests as well as in the plant. The discussion of these results is the main propose of this paper