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Engineering Logic

 

Selection of the Fabric enables a two-step process to be reduced to a simpler single filtration step.  In addition to the shorter delivery time, plant design contractors’ Como Engineers and heap leach specialist consultants Kappes, Cassiday & Associates selected SLS’s Fabric Media water filtration equipment because it presented a process step reduction which resulted in an order of magnitude saving in both equipment cost and footprint whilst achieving exactly the same treated water quality.

 

Project Overview

 

SLS were subcontracted to design, fabricate, supply, supervise installation and commission a PLC controlled fully automated Fabric Media water filter.  Capable of delivering Arsenic levels below the environment discharge maximum of 50ppb As concentration.

  • Raw water TSS up to 1000mg/L; Filtrate less than 0.05mg/L As, Flow rate 50m3/hr

  • Installation assist by document guide and video supervision

  • The detox process involved Peroxide oxidant, Copper catalyst, Ferric precipitation and Lime pH adjustment followed by immediate filtration with the backwash dewatered by pressure filtration.

 

Method Used

 

Peroxide oxidant, Copper catalyst and Ferric precipitation followed by filtration process with filter backwash dewatered by pressure filtration.

Equipment Used

  • FM_1425 (1400mm Diameter + 1 x Ishigaki Plate and Frame pressure filter having 24x800mm plate size)

  • Schneider based PLC HMI system with remote telemetry to Australia

Automation

The water filter is PLC automated with operator interactions via a HMI touchscreen. The PLC is located within the main control cabinet which has the HMI and manual override switches on the cabinet door.

Installation

Installation supervision was provided with onsite manpower from our Perth office and the task was completed within 3 working days.

 

Commissioning

 

January February 2017

Detoxification Process Filters

SLS supplied filtration equipment and consulting services to the Tujuh Bukit Copper gold project in Java.  Metallurgists generally describe the purification of water containing Cyanide, Arsenic and possibly other contaminants as a detoxification process.  These are common toxic contaminants generated in the alkaline leaching processes applied in most Gold, Silver and Copper operations. 

There are a number of subtly different detoxification processes available to the mining industry.  Each process involves removal of the cyanide and precipitation of the metal pollutant followed by a separation of the contaminants generating a purified filtrate.  The traditional solid liquid separation tools for this have involved a two-step process of gravity clarifier followed by a media bed filtration.

SLS Technology