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Vanadium, as a key strategic metal supporting high-end industries such as steel strengthening, new energy vanadium redox flow batteries, and aerospace alloys, its efficient and clean extraction has become a core proposition of the industry. Currently, China's vanadium resources are mainly low-grade vanadium-titanium magnetite and stone coal vanadium ore. Traditional vanadium extraction processes generally have pain points such as low recovery rate, serious environmental pollution, difficult impurity separation, and high operating costs. The popularization of the full hydrometallurgical acid leaching process has made the purification and enrichment of vanadium-containing leachate a new bottleneck. Solvent extraction, with the advantages of strong selectivity, high enrichment ratio, and continuous operation, has become the mainstream technology to solve the above problems. Among them, the mixed settler, as the most mature and widely applicable extraction equipment, has an irreplaceable position in the industrial production of vanadium metallurgy due to its stability, reliability, large processing capacity, and adaptability to complex feed liquids. It provides key technical support for improving vanadium resource utilization, ensuring the supply of high-purity vanadium products, and promoting green industrial upgrading.
As a classic stage-by-stage contact liquid-liquid extraction equipment, the mixed settler is composed of a mixing chamber and a clarification chamber as the core units. It realizes the interphase mass transfer of vanadium through stirring and mixing, and then completes the separation of organic phase and aqueous phase by gravity sedimentation. Its technical characteristics are highly consistent with the industrial demand for vanadium extraction. Compared with extraction towers, centrifugal extractors and other equipment, the mixed settler has multiple irreplaceable advantages in the field of vanadium solvent extraction: first, extremely strong operational stability, high tolerance to solid suspended solids and impurity ions in vanadium-containing feed liquids, not easy to emulsify, block and other problems, adapting to the leachate system of complex raw materials such as stone coal vanadium ore and vanadium slag; second, outstanding stage efficiency and processing capacity, the single-stage extraction efficiency can reach 80%-90%, and the vanadium recovery rate can be stably increased to more than 95% after multi-stage series connection, and it can be directly scaled up from laboratory scale to 10,000-ton industrial capacity, meeting the demand for large-scale vanadium extraction production; third, wide operating flexibility and simple maintenance, the equipment has a simple structure and few internal parts, and can flexibly adjust parameters such as the number of stages, phase ratio, and stirring intensity, adapting to vanadium-containing feed liquids of different grades and compositions, and the daily maintenance and cleaning costs are much lower than other extraction equipment; fourth, comprehensive process adaptability, which can be compatible with various vanadium extraction systems such as P204, P507, N235, TBP, etc., and can not only complete the extraction and enrichment of vanadium, but also realize the whole process operations of impurity washing, stripping, and solvent regeneration.
Vanadium-titanium magnetite is China's mainstream vanadium resource. Vanadium slag produced after blast furnace ironmaking and converter vanadium extraction is the core raw material for vanadium extraction. The traditional vanadium slag vanadium extraction mostly adopts the sodium roasting-water leaching process, which has problems such as waste gas pollution, large amount of salt-containing waste residue, and recovery rate of less than 75%. After adopting the mixed settler solvent extraction process, the vanadium slag acid leachate can be directly treated. With P204 or P507 as the extractant, the efficient separation of vanadium from impurities such as iron, aluminum, and titanium can be realized under acidic conditions. Industrial practice shows that the vanadium extraction rate under this process is stably above 96%, and the purity of the vanadium solution after stripping can reach 98%. It not only saves the high-temperature roasting link, reduces energy consumption and environmental protection costs, but also greatly improves the vanadium recovery rate and product purity. At present, it has been widely used in large vanadium-titanium industrial bases such as Panxi and Chengde.
China has abundant reserves of stone coal vanadium ore, but the vanadium occurrence state is complex and the grade is low. The traditional roasting process has defects such as low vanadium conversion rate and serious pollution. The mixed settler solvent extraction technology is compatible with green new processes such as direct acid leaching and low-temperature curing of stone coal, and can handle high-impurity and low-concentration vanadium-containing leachate. Aiming at the characteristics of coexistence of vanadium, chromium, silicon, aluminum and other impurities in stone coal acid leachate, quaternary ammonium salt-based alkaline extractants or acidic phosphorus-based synergistic extraction systems are selected to realize the selective enrichment of vanadium through multi-stage countercurrent extraction. In practical application, the mixed settler can effectively deal with the problems of high solid content and easy emulsification of stone coal feed liquid, ensure continuous and stable operation, and increase the total vanadium recovery rate of stone coal from 60% of the traditional process to more than 85%, promoting the efficient development and utilization of low-grade stone coal vanadium ore resources.
With the increasing consumption of vanadium resources, the recovery value of secondary resources such as vanadium-containing waste catalysts, vanadium electrolyte, and steelmaking flue dust has become prominent. Such raw materials have large composition fluctuations and many types of impurities, which have extremely high requirements on the adaptability of extraction equipment. With its wide operating flexibility and strong stability, the mixed settler has become the preferred equipment in this field. In the recovery of waste vanadium catalysts, it can directly treat the complex solution after acid leaching, and efficiently separate vanadium from impurities such as nickel, molybdenum, and silicon through the extraction-washing-stripping process, with a vanadium recovery rate of more than 93%; in the regeneration of waste vanadium redox flow battery electrolyte, it can accurately separate vanadium from metal impurities such as iron and chromium, and the purified vanadium solution can be directly reused for battery production, realizing resource recycling.
High-end vanadium products (such as high-purity vanadium pentoxide above 99.9%, vanadium electrolyte) have strict requirements on impurity content, which is difficult to meet by traditional processes. The mixed settler can realize deep purification and precise separation of vanadium through process optimization such as multi-stage series connection, deep washing, and fractional stripping. Combined with efficient extractants and synergistic extraction systems, it can effectively remove trace impurities such as iron, chromium, calcium, and sodium in the vanadium solution, and prepare high-purity vanadium products that meet the requirements of aerospace, all-vanadium redox flow batteries, electronic materials and other fields, making up for the shortcomings of chemical precipitation and ion exchange in deep separation.
Aiming at the shortcomings of the traditional mixed settler such as large floor area and long phase separation time, the industry has achieved technological breakthroughs through structural optimization and process upgrading. The new mixed settler adopts efficient stirring structure, inclined clarification chamber and coalescing packing design to shorten phase separation time and reduce solvent entrainment; through multi-stage series connection and countercurrent operation design, the separation efficiency and solvent utilization rate are further improved. At the same time, combined with the automatic control system, the precise control of parameters such as flow rate, pH value and temperature is realized, the error of manual operation is reduced, and the process stability is improved.
From the perspective of industrial value, the large-scale application of the mixed settler solvent extraction technology has effectively solved the environmental protection and efficiency bottlenecks of the traditional process. On the one hand, it reduces the emission of waste gas and waste residue in the roasting link, reduces the difficulty of acidic wastewater treatment, and conforms to the development trend of green metallurgy; on the other hand, it greatly improves the utilization rate of vanadium resources, reduces the waste of low-grade resources, and ensures the stable supply of China's strategic vanadium resources. In addition, the technology has mature process, moderate investment and convenient maintenance, which is suitable for large, medium and small vanadium smelting enterprises, and promotes the technological upgrading and high-quality development of the entire vanadium industry.
In the future, the vanadium solvent extraction technology by mixed settler will develop towards high efficiency, greenization and intelligence. In terms of high efficiency, further optimize the structural design to improve mass transfer efficiency, shorten phase separation time and reduce floor area; in terms of greenization, match low-toxicity and high-stability extractants to reduce solvent loss and realize the recycling of extractants and wastewater; in terms of intelligence, integrate the Internet of Things and big data technology to realize remote monitoring, fault early warning and automatic optimization of process parameters of equipment. At the same time, it will be coupled with membrane separation, ion exchange and other technologies to build a short-process and high-purity vanadium extraction process, better adapting to the demand for high-purity vanadium products in new energy, high-end manufacturing and other fields.
In summary, with the core advantages of stability, reliability, strong adaptability and large processing capacity, the mixed settler plays a key role in the extraction of vanadium-titanium magnetite, stone coal vanadium ore, vanadium-containing secondary resources and the preparation of high-purity vanadium. It is the core equipment to solve the current pain points in the vanadium resource extraction industry and realize efficient and clean production. With the continuous growth of vanadium industry demand and the continuous improvement of environmental protection standards, the vanadium solvent extraction technology by mixed settler will further consolidate its leading position in industrialization through continuous optimization and upgrading, and provide solid technical guarantee for the efficient utilization of China's vanadium resources and the development of strategic industries.
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