Banca de DEFESA: CARLOS MURILO DA SILVA FILHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CARLOS MURILO DA SILVA FILHO
DATE: 29/02/2024
TIME: 14:00
LOCAL: Teams
TITLE:

EVALUATION OF THE PRODUCTIVITY FOR THE TAILINGS FILTRATION CIRCUIT

KEY WORDS:

Chemical filtration assistant; filter cloth; filter press; design of experiments.

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Tratamento de Minérios
SPECIALTY: Métodos de Concentração e Enriquecimento de Minérios
SUMMARY:

Mining companies are increasingly seeking alternatives to tailings dams due to major accidents in the last decade. One of the ways used to meet this demand has been the dry disposal of the tailings, which occurs after a detailed filtration process. This technology helps to maintain productivity, water recirculation in the process and to dispose of the tailings safely. Although filtration is a known technology, the domain of process variables for certain lithologies has not yet been established, requiring detailed studies and a better understanding. One way to help the productivity of the filters, in addition to the characteristics of the filter clothes, is the use of chemical filtration assistants, which can reduce the tailings moisture to be deposited, thus increasing the recirculation of process water, and increasing the filtration rate. In this sense, the present work aimed to achieve the best results to achieve the optimal moisture and the highest possible filtration rate (dry mass/time/filtration area), using chemical filtration assistants and different filter clothes. To conclude these objectives, bench filtration tests (Leaf Tests), with vacuum filters, were performed using process water, common water, paper filters, filter clothes and chemical filtration assistants, supplied by companies operating in national and international mining. A tailings sample, from the company AngloGold Ashanti, located in the city of Crixás, in the state of Goiás, was used throughout the research. The tests were carried out at The Mineral Treatment Laboratory of CEFET – MG and the statistical analysis of the results was performed using Minitab Statistical Software^®. The results achieved, using the reagents and filter clothes, with the bench tests, were satisfactory, obtaining 13.7% moisture (wet base) in the cake, reaching the optimal moisture performed by the compaction test and an average TUF (filtration rate) of 280 kg/h/m², above the TUF achieved by the tests without the addition of reagents. Separately, the optimization tests with the use of the reagent Flocticor FA 18899 showed a gain of 4% in productivity, while the optimization tests with the use of filter cloth made with 100% polyamide, permeability between 84.9 and 135.9 m³/h and grammage of 348 g/cm² showed a gain of 7.7% in productivity. The use of chemical filtration assistants and filter clothes has demonstrated the feasibility of achieving optimal moisture levels on an industrial scale while also increasing the filtration rate. 

COMMITTEE MEMBERS:
Presidente - MICHELLY DOS SANTOS OLIVEIRA
Interno - NATAL JUNIO PIRES
Externo à Instituição - FRANCISCO GREGIANIN TESTA