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STUDY OF IN SITU CYANIDE DETOXIFICATION ON GOLD PROCESSING TAILING AT PONGKOR GOLD MINE Lili Tahli; Tatang Wahyudi
Indonesian Mining Journal Vol 11, No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Puslitbang tekMIRA

Currently, gold processing unit at Pongkor mine processes cyanide-containing waste at the end pipe or known as final process. Due to the increase of environmental awareness from the community, such a process needs to be re-evaluated. This relates to tight regulation regarding safe waste prior to releasing to the nature. Conflicts will arouse when population at surrounding area increases fast. To anticipate such conflicts, the gold processing unit of Pongkor mine proposes a scenario dealing with waste processing improvement from the end pipe process to the whole one. It includes reagent use optimization and waste minimization including its recycle. In situ cyanide detoxification is one of waste minimization processes conducted at Pongkor mine. In terms of comparing which one of the methods is the best in reducing cyanide within wastes, a series of cyanide reduction tests employed Inco’s and Degussa methods at a laboratory scale. To reduce high cyanide concentration of the wastes, the used reagents in Inco’s method include Na2 S2O5, CuSO4.5H2O and pressured by the air while Degussa method applied H2O2 and CuSO4.5H2O. The results from this experiment suggest that Inco’s technology is able to detoxify cyanidation effluents better than that of Degussa technology.

PROCESS MINERALOGY FOR EVALUATING MINERALOGY, PHYSICAL AND CHEMICAL CHARACTERS OF THE TAILINGS COMES FROM GOLD PROCESSING Tatang Wahyudi
Indonesian Mining Journal Vol 17, No 3 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 3 OCTOBER 2014
Publisher : Puslitbang tekMIRA

Based on mineralogy, physical and chemical analyses, character of gold-processing tailings from Pongkor showed relatively complex condition. Gold particles were normally included by either sulfide (pyrite, chalcopyrite, galena, arsenopyrite, sphalerite etc.) or silicate minerals (mainly quartz). The inclusion structure performed single, double or multiple forms. Single inclusion meant that gold particle(s) was encased by one mineral phase while double and multi inclusions implied that the gold was sheathed by two or more phases. Gold was distributed along the micro-cracks of either similar or different phase. Chemical analyses showed that Pongkor tailings were characterized by several elements that might be ineffective for gold leaching by cyanide. Preg-robbing solution might be occurred.

IMPROVING TAPIN KAOLIN QUALITY FOR WHITE WARE CERAMIC Subari Subari; Tatang Wahyudi
Indonesian Mining Journal Vol 17, No 2 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 2 JUNE 2014
Publisher : Puslitbang tekMIRA

Tapin kaolin cannot directly be utilized as raw material for white ware ceramics due to its high Fe2O3 content. It needs upgrading its quality in terms of fulfilling the specification of white ware ceramics. Such the material requires a series of process including washing, wet sieving in magnetic ferro-filter equipment and then dissolv- ing by H2SO4 10%. Based on several parameters such as Al2O3, SiO2 and Fe2O3 contents, 2-µm particle size density, whiteness and plasticity; Tapin kaolin quality develops significantly. XRD analysis shows that the mate- rial does not have maghemite anymore. Quartz is relatively low and mafic minerals are unavailable. Referring to such quality, Tapin kaolin can be used for Parian porcelain.

A CHARACTERISTIC STUDY OF POPAY ZIRCON SAND USED FOR CERAMICS, REFRACTORY AND FOUNDRY RAW MATERIALS Lili Tahli; Tatang Wahyudi
Indonesian Mining Journal Vol 19, No 1 (2016): INDONESIAN MINING JOURNAL Vol. 19 No. 1 February 2016
Publisher : Puslitbang tekMIRA

The objective of this study is characterizing the zircon sand from Popay of Nanga Pinoh District, West Kalimantan as well as its performance when separated using physical method, i.e., tabling and magnetic separator in terms of obtaining zircon concentrate for making zircon flour. The satisfied requirement of zircon flour will be used for ceramics, refractory and foundry raw materials. Tabling followed by magnetic separator of Popay zircon sand increase zircon content from 43.54 to 65.50%. The content increases to 66.11% when reversing the process, namely started with magnetic separator and then tabling. Mineralogical analysis using optical microscope detected six minerals available within zircon sands. Those are zircon, ilmenite, magnetite, hematite, rutile and quartz while XRD analysis only identified five minerals. Hematite was not distinguished within Popay samples. Chemical analysis of the samples shows that the ZrO2 content within zircon flour is bigger than 65%. Such a figure is categorized as premium class for zircon flour to be used for refractory, ceramics and foundry.

Abstract Indext Tatang Wahyudi
Indonesian Mining Journal Vol 23, No 1 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 1, April 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No1.2020.1102

EFFECT OF REAGENT VOLUME AND CONCENTRATION ON RECOVERIES OF MgO AND SO3 WITHIN SYNTHETIC DOLOMITE-BASED KIESERITE Tatang Wahyudi; Retno Damayanti
Indonesian Mining Journal Vol 16, No 3 (2013): INDONESIAN MINING JOURNAL Vol. 16 No. 3 OCTOBER 2013
Publisher : Puslitbang tekMIRA

Natural kieserite is usually used for the production of epsom salt and fertilizer. Normally, the mineral is mined from geologic marine deposits and provides a soluble source of both Mg and S for plant nutrition. However, natural kieserite cannot be found in Indonesia. The fact that this country retains a lot of dolomite deposits and such a material can be processed into synthetic kieserite by sulphatization process seems promising for fertilizer industry in Indonesia. Varying the sulfuric acid concentration between 2 and 5 N and its volume from29.50 to 94.80 ml produces the MgO in MgSO4 filtrate below the specification as stated in Indonesian National Standard (14 – 19%) though its sulfur content has satisfied the requirements. It is assumed that some MgO’s (around 1.93 – 7.12%) are still available in CaSO4 deposit. To get the optimum results, an appropriate calcula- tion is required when adding sulfuric acid to the process and the solution should be in neutral condition prior to separating MgSO4 – CaSO4 as well.

PROCESS MINERALOGY FOR EVALUATING MINERALOGY, PHYSICAL AND CHEMICAL CHARACTERS OF THE TAILINGS COMES FROM GOLD PROCESSING Tatang Wahyudi
Indonesian Mining Journal Vol 17 No 3 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 3 OCTOBER 2014
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol17.No3.2014.319

Based on mineralogy, physical and chemical analyses, character of gold-processing tailings from Pongkor showed relatively complex condition. Gold particles were normally included by either sulfide (pyrite, chalcopyrite, galena, arsenopyrite, sphalerite etc.) or silicate minerals (mainly quartz). The inclusion structure performed single, double or multiple forms. Single inclusion meant that gold particle(s) was encased by one mineral phase while double and multi inclusions implied that the gold was sheathed by two or more phases. Gold was distributed along the micro-cracks of either similar or different phase. Chemical analyses showed that Pongkor tailings were characterized by several elements that might be ineffective for gold leaching by cyanide. Preg-robbing solution might be occurred.

IMPROVING TAPIN KAOLIN QUALITY FOR WHITE WARE CERAMIC Subari Subari; Tatang Wahyudi
Indonesian Mining Journal Vol 17 No 2 (2014): INDONESIAN MINING JOURNAL Vol. 17 No. 2 JUNE 2014
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol17.No2.2014.331

Tapin kaolin cannot directly be utilized as raw material for white ware ceramics due to its high Fe2O3 content. It needs upgrading its quality in terms of fulfilling the specification of white ware ceramics. Such the material requires a series of process including washing, wet sieving in magnetic ferro-filter equipment and then dissolv- ing by H2SO4 10%. Based on several parameters such as Al2O3, SiO2 and Fe2O3 contents, 2-µm particle size density, whiteness and plasticity; Tapin kaolin quality develops significantly. XRD analysis shows that the mate- rial does not have maghemite anymore. Quartz is relatively low and mafic minerals are unavailable. Referring to such quality, Tapin kaolin can be used for Parian porcelain.

A CHARACTERISTIC STUDY OF POPAY ZIRCON SAND USED FOR CERAMICS, REFRACTORY AND FOUNDRY RAW MATERIALS Lili Tahli; Tatang Wahyudi
Indonesian Mining Journal Vol 19 No 1 (2016): INDONESIAN MINING JOURNAL Vol. 19 No. 1 February 2016
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol19.No1.2016.361

The objective of this study is characterizing the zircon sand from Popay of Nanga Pinoh District, West Kalimantan as well as its performance when separated using physical method, i.e., tabling and magnetic separator in terms of obtaining zircon concentrate for making zircon flour. The satisfied requirement of zircon flour will be used for ceramics, refractory and foundry raw materials. Tabling followed by magnetic separator of Popay zircon sand increase zircon content from 43.54 to 65.50%. The content increases to 66.11% when reversing the process, namely started with magnetic separator and then tabling. Mineralogical analysis using optical microscope detected six minerals available within zircon sands. Those are zircon, ilmenite, magnetite, hematite, rutile and quartz while XRD analysis only identified five minerals. Hematite was not distinguished within Popay samples. Chemical analysis of the samples shows that the ZrO2 content within zircon flour is bigger than 65%. Such a figure is categorized as premium class for zircon flour to be used for refractory, ceramics and foundry.

EFFECT OF REAGENT VOLUME AND CONCENTRATION ON RECOVERIES OF MgO AND SO3 WITHIN SYNTHETIC DOLOMITE-BASED KIESERITE Tatang Wahyudi; Retno Damayanti
Indonesian Mining Journal Vol 16 No 3 (2013): INDONESIAN MINING JOURNAL Vol. 16 No. 3 OCTOBER 2013
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol16.No3.2013.384

Natural kieserite is usually used for the production of epsom salt and fertilizer. Normally, the mineral is mined from geologic marine deposits and provides a soluble source of both Mg and S for plant nutrition. However, natural kieserite cannot be found in Indonesia. The fact that this country retains a lot of dolomite deposits and such a material can be processed into synthetic kieserite by sulphatization process seems promising for fertilizer industry in Indonesia. Varying the sulfuric acid concentration between 2 and 5 N and its volume from29.50 to 94.80 ml produces the MgO in MgSO4 filtrate below the specification as stated in Indonesian National Standard (14 – 19%) though its sulfur content has satisfied the requirements. It is assumed that some MgO’s (around 1.93 – 7.12%) are still available in CaSO4 deposit. To get the optimum results, an appropriate calcula- tion is required when adding sulfuric acid to the process and the solution should be in neutral condition prior to separating MgSO4 – CaSO4 as well.

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