Technology Brief
Since the foundation in 1953, ENFI has been committed to research, development and innovation of nickel metallurgy technology, and served as the pioneer of nickel metallurgy technology in China. It has undertaken the whole-process service such as process research and engineering design for almost all nickel smelters in China, and acts as the only engineering company in China to fully master the full range of technologies from mining and beneficiation to pyrometallurgical and hydrometallurgical smelting of nickel sulfide ore and nickel oxide ore.
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Nickel Laterite High Pressure Acid Leach Technology
The nickel laterite HPAL technology adopts concentrated sulfuric acid to agitate and leach laterite ore under high pressure and high temperature, achieving a Ni-Co leaching rate of more than 95%. This system can be used for processing resources of complex composition and low grade and quick and effective leaching out of valuable metals from raw materials to reach a high leaching rate that is unattainable under atmospheric pressure. Characterized by low energy consumption and environmental friendliness, the system can also be used for comprehensive recovery of valuable metals from resources and slag recycling. It is a green and eco-friendly technology with low carbon emission. So far, it has been applied to large-scale projects sites, including PNG Ramu Nickel Laterite Project and Lygend OBI HPAL Project.
① Long-distance slurry piping technology
The long-distance pipe for conveying nickel laterite ore adopted by PNG Ramu Nickel Laterite Project is the first long-distance nickel laterite slurry piping project that has been put into operation in the world. The total length of pipes is 135km and four-stage large-flow centrifugal pumps (2,400m3/h) are used to operate in series in short distance, marking the first time to employ pipes with non-standard but uniform inner diameter in the world.
② Solid-liquid separation technology
ENFI boasts well-proven and excellent solid-liquid separation technology, featuring a perfect match between process and equipment design and selection, which can save capital costs and operating costs for clients and guarantee the optimum process performance.
Nickel Sulfide Ore Pressure Leaching Technology
ENFI has mastered the state-of-the-art Ni-Co resource mining and extraction technology, hydrometallurgical smelting technology of nickel cobalt sulfide ore, as well as atmospheric leaching, POX leaching, extraction, purification, process wastewater treatment and product deep processing technology regarding Ni-Co resources.
Ni-Co SX Technology
The market share of ENFI in China concerning SX design surpasses 50% and that concerning Ni-Co SX comes close to 90%.
Comprehensive Ni-Co Recovery Technology
ENFI possesses technology with low energy consumption and zero waste liquid emission in the filed of Ni-Co metallurgy and materials, and boasts large-scale industrial cases in such domains as Ni-Co refining in sulfuric acid system, Co refining in ammonia system, ion adsorption of complex low-concentration Ni-Co solution, deamination of mother liquid from multi-material synthesis, membrane treatment of high-quality material washing solution, multi-effect evaporation and crystallization, and MVR evaporation.
Required Equipment
High-temperature pressure leaching system
Autoclave
Flash vessel
Acid addition device
Preheater
Metallurgical SX equipment — mixer-settler
Related Cases
Tagaung Taung Nickel Mine in Myanmar
The project consists of mining and mineral processing area, smelter area, office and living area and utilities area. Its designed throughput is 1.3 million t/a of nickel laterite ore (dry basis). Its annual output is 85000t of FeNi, including 23000t of Ni. It adopts 2 RKEF (Rotary Kiln-Electric Furnace) production lines. For the first time, it uses the largest rotary kiln of φ5.5×115m in China, and adopts the largest 72MVA laterite ore submerged thermal electric furnace in China.
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Ramu Nickel and Cobalt Project in Papua New Guinea - main works
It is a world-class mining project that combines mining, mineral processing and smelting, and is the largest overseas non-ferrous project invested by Chinese companies. The project produces Ni-Co intermediary products which is equivalent to 32,601t/a of Ni metal, 3335t/a of Co metal, with 3.21 million t of nickel laterite conveyed annually.
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Liqin HPAL project in OBI Island, Indonesia
The scale is 36kt/a nickel, 4kt/a cobalt. The production time is 2021, and it will take 3 months for the material to reach production. The completion and commissioning of the OBI project marks the successful application of the high-pressure acid leaching technology and core equipment for laterite nickel ore.
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