Demineralization of Low-grade Ethiopian Coal through Alkali-acid Leaching Method to Use in Cement Industries

Abstract

In Order To Improve Ethiopian Coal's Qualities And Lower Its Ash And Sulfur Content, This Study Looks Into The Chemical Demineralization Process. The Demineralization Efficiency Is Known That Affected By Process Parameters Positively Or Negatively. In Order To Investigate The Effect Of Demineralization Parameters Without Significantly Sacrificing The Organic Components Of The Coal And To Make The Coal Suitable For Cement Industries, Ethiopian Coal (Boroda Coal) Was Leached In A Stepwise Manner Under Varying Process Conditions Including Concentration, Leaching Temperature, Leaching Time, And Coal Particle Size. The Effect Of These Process Parameters Was Investigated With Respect To Demineralization Efficiency And Calorific Value Improvement. To Compare And Contrast The Demineralization Capacity As Well As The Cv Of Coal, This Inquiry Tried To Characterize And Analyze The Raw Ethiopian Coal (Boroda Coal) And The Demineralized Coal Proximally And Instrumentally. In Order To Compare The Effectiveness Of Coal Leaching And Physical Beneficiation, Froth Flotation Of Boroda Coal Is Conducted. Although The Percent Demineralization And Cv Of The Coal Slightly Increased After 7.5% Concentration And 3hrs Of Contact Time, The Two-Step Naoh-Hf Leaching Gave 78.9% Ash Removal And 50.11% Desulfurization And Also The Cv Improved By 21.8% To 5207 Kcal/Kg. The First Stage Naoh-Hf Leaching Was 28.8%, Thus, The Second Stage Increased The Ash Removal To 78.9%. The Proximate Analysis Indicated That 52.52% Of Demineralization Was Achieved With 10.3% Cv Improvement To 4715 Kcal/Kg.