One of the most important factors during the process of comminution of minerals is their power consumption rate, which is determined by calculating the WI (work index), which in short is to analyze the amount of kWh consumed per ton of material, to reach a certain particle size and achieve the desired. Along with the quality of the ore is defined and use the classification of the ore. Ores of jaspelite type, high hardness, and with lower iron content 60% with silica content above 10.5%, tends to be considered economically unsuitable for merger cases in the Brazilian market. The work presented here consists of a technique that acts by transforming this type of ore at an acceptable quality product and with a lower power consumption than the previously calculated by WI analysis. The procedure presented here recovers a quantity of more than 75% by weight, taking an ore 56% Fe, for an average content of 65% SiO 2 and lowering the 10% to 4.5%. Although reducing by 50% the amount of phosphorus present. The procedure presented here using known methods, but with a variation with respect to the operation, which gives you innovative character, acting together with a selective screening.
One of the most important factors during the process of comminution of minerals is their power consumption rate, which is determined by calculating the WI (work index), which in short is to analyze the amount of kWh consumed per ton of material, to reach a certain particle size and achieve the desired. Along with the quality of the ore is defined and use the classification of the ore. Ores of jaspelite type, high hardness, and with lower iron content 60% with silica content above 10.5%, tends to be considered economically unsuitable for merger cases in the Brazilian market. The work presented here consists of a technique that acts by transforming this type of ore at an acceptable quality product and with a lower power consumption than the previously calculated by WI analysis. The procedure presented here recovers a quantity of more than 75% by weight, taking an ore 56% Fe, for an average content of 65% SiO 2 and lowering the 10% to 4.5%. Although reducing by 50% the amount of phosphorus present. The procedure presented here using known methods, but with a variation with respect to the operation, which gives you innovative character, acting together with a selective screening.
In this work, it is propose a design method of control based on disturbance observer in the frequency domain. The control problem is formulated as a multiobjective optimization problem in which the optimization variables are the parameters of the controller and the disturbance observer. In order to have a compromise between disturbance rejection and measurement noise attenuation, with consequent minimization of the control effort, we have adopted as control objectives the H ∞ norm of the transfer function relating the disturbance and the system output and H 2 norm relating the measurement noise and the control signal. A multiobjective evolutionary optimization technique is applied to provide a set of efficient solutions with different trade-offs between the two control objectives, allowing the designer to determine which solution is most suitable for the specific problem. Resumo: Neste trabalhoé proposto um método de projeto de controle baseado em observador de distúrbio, no domínio da frequência. Formulou-se o problema de controle como um problema de otimização multiobjetivo em que as variáveis de otimização são os parâmetros do controlador e do observador de distúrbio. De modo a se ter um compromisso entre rejeição ao distúrbio e atenuação de ruído de medição, com consequente minimização do esforço de controle, nós adotamos como objetivos de controle a norma H ∞ da função de transferência relacionando o distúrbio e a saída do sistema e a norma H 2 relacionando o ruído de medição e o sinal de controle.É aplicada uma técnica de otimização evolutiva multiobjetivo que fornece um conjunto de soluções eficientes com diferentes compromissos entre os dois objetivos de controle, permitindo ao projetista determinar qualé a solução mais adequada para o problema específico.
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