- Home
-
Producten & Oplossingen
-
Industrieën & afdelingen
- Vind producten via branches
- Chemische industrie
- Farmaceutica & biotechnologie
- Voedingsmiddelen en dranken
- Onderwijs en overheid
- Laboratoria en gezondheidsinstituten
- Metaal, kunststoffen en elektronische componenten
- Grondstoffen en juwelen
- Pulp, papier en textiel
- Engineering, machinebouw en systeemintegrators
- Transport en logistiek
- Nutsbedrijven en gemeenten
- Retail
- Find Products by Workplaces
- Onderzoek en ontwikkeling
- Techniek, Procesontwikkeling & Verhogen
- Laboratorium, Inspectie & Kwaliteitscontrole
- Ontvangst & Opslag
- Productie en verwerking
- Verpakking & Vullen
- Logistiek, Post & Verzending
- Onderhoud & Service
- IT / Information Technology
- Retail
- Water, Energie & Nutsbedrijven
- Diensten & Ondersteuning
- Over ons
- Neem contact met ons op
|
|
Accurate Process Control Leads to Superior Zinc Production
Precise control of sulfuric acid concentration is vital for efficient leaching of zinc calcine. A zinc producer in India was looking for a reliable method of determining acid concentration that would withstand the harsh conditions and require very little maintenance. The answer? In-line conductivity measurements.
Binani Zinc Ltd. in Binanipuram, Kerala, India has been producing zinc since 1967. Company engineers were not satisfied with the efficiency of their zinc leaching process and believed far greater productivity could be achieved.
Zinc leaching
Leaching of zinc from zinc calcine is carried out in a two-stage countercurrent process. Firstly, finely ground calcine is leached in a dilute sulfuric acid solution taken from the second leaching stage to produce a first stage leach solution containing a high zinc concentration. After suitable purification treatment, zinc is recovered from this solution by conventional electrowinning. Crucial to obtaining high zinc yield from the entire process is the control of sulfuric acid concentration.
Requirements
Binani Zinc had been using sample based lab analysis for acid concentration measurement. However, they found that effective process control was not possible because of the time taken to perform measurements and their infrequency.
As part of their philosophy of continuous improvement, Binani Zinc looked for a reliable system for determining acid concentration, with high repeatability, very low maintenance, a reasonable cost of ownership, and an ability to withstand the process conditions.
After discussions with METTLER TOLEDO engineers, it was agreed that indirect acid concentration measurement by determining conductivity in the process medium would be the best solution. Binani Zinc purchased seven identical systems, comprising InPro 7250 PEEK conductivity sensors, M700 transmitters and InDip 550 PVDF housings.
Process improvement
Before installation of the METTLER TOLEDO systems, acid concentration fluctuated from 30 – 90 gpl. Thanks to the InPro 7250 and M700, that range is now held to a much more satisfactory 55 – 70 gpl, leading to the better process control and improved productivity Binani Zinc were looking for. In addition, plant engineers appreciate the robustness and maintenance-free operation of the InPro 7250. The sensor’s PEEK body is resistant to acids and has no electrodes in contact with the process medium that could become fouled. In combination with the M700 transmitter, engineers find the whole system simple in use and operation.
Find out how you can benefit from the InPro 7250 in your processes, at:
Products and Solutions