Thesis (M.Eng.)--Chulalongkorn University, 2015

The purpose of this research is to conduct a pre-feasibility study of a processing plant design at the Bankha district, Ratchaburi province. In this research will focus on the different particle-size at percent grade of tin from 20 samples of 6 pitting (total weight is 596 kgs), the study included mineral processing by using physical separation, mineral analysis of sample by using x-ray fluorescence (XRF). The chemical analyses of samples are as follows: the sample -3 +4 mesh: 1.64% Sn, 0.07% Ta and 0.008% Nb, the sample -4 +14 mesh: 2.10% Sn, 0.07% Ta and 0.01% Nb, the sample -14+30 mesh: 2.37% Sn, 0.05% Ta and 0.008% Nb and the sample -30 mesh: 2.43% Sn, 0.07% Ta and 0.009% Nb, respectively. These results can be applied to the definition of main machine for tin ore processing plant such as trommel, jig separator, hydrocyclone, spiral concentrator, shaking table, ball mill, spiral classifier, vibrating screen, magnetic separator and high tension separator, and designed by using the commercial software “AutoCAD civil 3D”. The final tin concentrate can be upgraded to 74% Sn at a recovery of 90.0%. Financial model, consisted of cash flow analysis, net present values (NPV), and the Internal Rate of Return (IRR) are the main point for economics consideration. In this point, 79% of internal rate of return was calculated with the net present values of 447,779,678 baht and the payback period was 1.09 years.