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World Journal of Engineering
Research and Technology

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

Impact Factor : 5.218

ICV : 79.45

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Indexing

Abstract

PRODUCTION AND CONTROL OF SODIUM DICHROMATE FROM CHROMITE ORE

Eglal A. Ahmed, Gurashi. A. Gasmelseed and Waleed Nour Eldien*

ABSTRACT

Sodium chromate and dichromate are the most important chromium products, used chiefly for manufacturing chromic acid and chromium pigments used in leather tanning and corrosion control. Chromite is crushed, roasted with soda ash to produce sodium chromate. Sodium chromate are to be reacted with concentrated sulphuric acid to produce sodium dichromate. The two reactions will be investigated, designed and controlled. The control strategy was developed to control of their actor, the block diagram of the system was constructed and the process transfer function was identified using MATLAB Black Box model. Then the overall transfer function, the closed-loop, and the characteristic equation was determined, and the control system was tuned to obtain the adjustable parameters using Routh-Hurwitz, Direct Substitution, Root locus, and Bode methods. The adjustable parameters were appropriately inserted into the characteristic equation for the stability analysis and response simulation. It is found that using of PI- controller for the Primary loop provides the lowest overshoot than P and PID controllers.

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