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MEI Online: Plant Operation News: Africa: August 7th 2003


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:: Marula Project

Extensive experience within the platinum industry resulted in Multotec Process Equipment securing an order for the supply of all the dry sampling and preparation equipment as well as the majority of the wet slurry samplers for Impala’s Marula Project.

Rolf Steinhaus, manager of the samplers division at Multotec Process Equipment, says that three separate dry sampling systems, one coarse ore and two fine ore, will be provided and commissioned later this year.

The coarse ore sampling system will sample UGII ore being conveyed from Driekop and Clapham shafts. The material, with a top size of 150 mm, will be sampled alternately from each belt at regular timed intervals providing the central sample preparation station with a primary sample every ten minutes.

This hammer cross-belt sampler has a 450 mm wide cutter to provide approximately 80 kg of primary sample per increment and incorporates all the latest design improvements based on 400 installations in southern Africa to date.

Steinhaus says that the central preparation plant makes provision for single stage impact crushing and division using the ever-reliable rotating plate divider supplied by Multotec Process Equipment. The final sample is collected in a four-container carousel or table indexer, making provision for daily internal control samples, he says.

Dust extraction equipment has also fallen within the scope of Multotec Process Equipment’s supply.

The two fine ore sampling systems are situated at the main process plant DMS (dense medium separation) section on the feed and floats conveyors respectively. This material is minus 20 mm in size and the proven Multotec Process Equipment cross belt hammer sampler is being used in the one application with an alternative belt end cross cut primary sampler in the other.

Single stage division is used in both applications with rotating plate dividers once again. A jaw-crushing step has been included in the DMS feed application to enhance sample integrity by increased sample homogeneity prior to sub division.

Multotec Process Equipment was also asked to supply launder cross cut samplers and secondary vezin samplers around the flotation circuits in the rougher, cleaner and concentrate applications. In addition to this, a number of primary pressure samplers were supplied to provide continuous feed to on-line analysers.

Once again, the samplers were custom designed in terms of cutter geometry and sample retention specifications to meet Impala’s exact process requirements.




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