beneficiation grade iron ore manganese

Iron ore beneficiation process research mostly examines iron ore with laterite type, magnetic type or hematite type. In Lampung provinces, there is iron ore with manganese content, where it potential to become ferro manganese that is important to the industry. Has been carried out with iron ore beneficiation process of iron and manganese content with the way gravity separator where the first process namely destruction of ore boulders up to 2-4 cm size using a jaw crusher. Further ore produced was crushed using a hammer mill until smooth, to get fine ores with higher numbers used in ball mill. The next carried screened in which obtained the largest percentage of weight on the size of- 20 + 40 mesh ,while the Fe content of the largest in size – 200 mesh is 29.2 %. The next stage was the concentration of gravity using a shaking table, the highest recovery is obtained at – 100 -^ 200 mesh of 66.43% with Fe content in concentrate 34.50%. The process of shaking table followed by a magnetic separator where the highest recovery is obtained at – 100 + 200 mesh of 83.12% with Fe content in concentrate 53.54%. By using magnetic concentration sample who have undergone the process of roasting at a temperature of 1000 “C have recovery results obtained at 88.5 % with Fe content in concentrate 60.52%, and 83.31 for Mn

INTRODUCTION

70% of supply the world is produced from iron deposition or Banded Iron Formation (BIF). BIF deposition is generally found in sedimentary rocks or meta sediment associated with basin formation Arhean inland old shield until Pre-Cambrian. Indonesian island arc rocks are generally composed by Mesozoic to Tertiary age and have never found BIF deposition. Therefore, the national steel industry would have to import from countries that have iron deposits such as BIF Minas Grais, Brazil and Hainersley, Australia.

The discovery outcrop is similar to the BIF deposition in Tanggamus. Lampung – Indonesia where have possibilities of a controversy or a geological anomaly event when compared with the sediment deposition BIF Arhean famous old world. BIF Tanggamus invention is an excellent opportunity for exploration of iron deposits to the fulfillment of the type BIF Indonesian iron reserves in the future.

The processing of iron ore into raw materials that are ready to be processed into the material between the general uses of iron ore with iron content is high enough. In many countries of processed raw material is of primary iron ore with Fe content is quite high. In some countries such as India and China, raw materials used are low grade iron ore. This is done to solve the problem of expensive raw materials iron ore and iron ore reserve potential that exists.

In India, for economic reasons and increased efficiency of blast furnaces, elevated levels or beneficiation process plays an important role. Various techniques are used to raise the levels of Fe after the size reduction process. These techniques include using hydrocyclon, spirals, magnetic separation, flotation and so forth. The involvement of these techniques successfully raises the Fe content from 60.31% to 64.06%. Elsewhere flotation process to increase the involvement of Fe content and at the same lower levels of silica and alumina, from 57.84% Fe content, 6.7% Si02 and 6% A1203 Fe content become 65.34% after undergone flotation process and low levels of silica and alumina.

In other research at the same fields, has been done beneficiation laterite iron ore with Fe content 56.27%, Si02 3.19%, AI203 6.32% and TiO, 0.79%. This research use washing process with ordinary equipment like log washer, wet vibrating screen and rotary drum washer. Result have improvement Fe content to 60%. For magnetic iron ore low grade with Fe content 38.86%, beneficiation is done with magnetic separator, but to improve until 60% Fe content, it done with combination of washing process and magnetic separation. Iron ore with limonite type where it not has magnetic characteristic, limonite needs to be changed first into hematite or magnetic through roasting process. With this method iron ore can be improved from 41% Fe become 66% Fe content.
The passing of Indonesian Mineral Coal Act No.4 of 2009 is expected to provide a new era in the management of mineral resources in Indonesia. Employers are prohibited from exporting minerals mining in the form of raw ore, mineral management needs to be done to provide added value. This law requires the extraction of minerals in a series of process management. When physically examined in addition to containing Fe as the main element was iron ore Tanggamus contains elements of Manganese (Mn). Both elements are important commodities in the steel industry. Therefore we need an iron ore beneficence technology to suit the characteristics of local iron ore.

EXPERIMENT METHOD

Materials and Equipments

Raw materials used in this study are iron ore with manganese content from Tanggamus, Lampung and water. Tools used include jaw crusher, ball mill, screening, shaking table, magnetic separator, furnaces, and ovens.

Experiment Procedure

Preparation of raw materials At this stage carried out the destruction of raw materials (iron ore) using a jaw crusher and then continued to the process of grinding using a hammer mill and ball mill. The process in the jaw crusher itself is done in 2 stages to get the size of 50-10 mm of iron ore products. Then proceed with the process of grinding using a hammer mill and ball mill. Continuing the process of screening to get a size 10 to -200 mesh iron ore. Iron ore results of screening washed using water in the cylinders tube where equipped with agitators to separate the impurities in the form of clay. Forwarded on to the drying process by using an oven at temperatures of 150 C. Samples of raw materials are ready to particularly analyze the content of Fe, Si and Mn.

Shaking table construction process is made with squure dimensions consists of 3 main components of the chassis body, primarily using the material in the form of iron UNP 120 and 100 mm, table surface using acrylic material with a thickness of 2 mm and a major driver of the induction motor 0.75 KW 1 lip with an adjustable variable speed rotation, is connected with a pulley to move the iron as that made in such a way as to generating movement back and forth that will shake the desk surface. The dimensions of the chassis length and width are 2450 mm 1200 mm. Dimensional surface of a long table is 2000 mm and width 1200 mm.

CONCLUSIONS

From the research results can be drawn some conclusions from the data obtained are:

  • The largest percentage of screening results obtained on the size of -20 +40 mesh with a weight percentage reached 36.17% by weight.
  • For Fe content, the biggest in size -200 mesh is 29.2%, the largest Mn contents contained in the -80 -100 mesh size that is 9.31%.
  • Results highest recovery shaking table at -100 -200 mesh, for Fe obtained recovery of 66.43% for Mn obtained recovery of 51.35%.
  • Results The highest recovery of non roasting process sample with the magnetic separator at – 100 -200 mesh of 83.12% with Fe content in concentrate 53.54%, for Mn is 78.60%.
  • The result for highest recovery sample roasting process with the process of magnetic separator at -100 + 200 mesh is 88.5% with Fe content in concentrate 60.52%, amounting to 83.31% for Mn.

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