- The NPK pilot plant in Porsgrunn, Norway, uses the nitrophosphate process.
- Key steps include digestion, crystallization, and neutralization.
- The new facility replaces hardware from the '50s and '60s.
- It features a new cooling system and a two-step gas-scrubbing system.
Introduction
Yara’s Innovation and R&D department has launched a new NPK pilot plant at its research center in Porsgrunn, Norway. This facility aims to enhance operational efficiency and flexibility.
Process Overview
The pilot plant employs the nitrophosphate process, which includes several steps. First, phosphate rock is dissolved in nitric acid during the digestion phase to create 'digestion liquor.' Next, the crystallization phase cools this liquor to form calcium nitrate, which is then separated out. The remaining phosphorous-containing liquor, known as 'mother liquor,' undergoes neutralization with ammonia to produce 'NP liquor.'
Upgraded Equipment
The new plant replaces outdated hardware from the 1950s and 1960s, which required almost entirely manual operation. The upgraded facility features modern equipment, much of which is controlled by a new steering and control system. A novel cooling system can reduce the mother liquor temperature to at least -20°C, and a two-step gas-scrubbing system ensures compliance with emissions regulations.
Benefits and Future Applications
The new pilot plant offers significant improvements in flexibility and efficiency, aiding in innovation projects and process optimization. It will also help evaluate new raw materials and troubleshoot existing processes, benefiting Yara's NPK plants in the long term.
