Continuous Extraction Process Research Articles

Fast pyrolysis of paper sludge in a continuous stirred-tank reactor and liquid-liquid extraction of benzenoid aromatics from fast pyrolysis bio-liquid

Paper sludge is a solid waste in paper mills and is conventionally treated by, e.g., landfill, composting, and incineration. Paper sludge contains paper production fillers and lignocellulosic biomass, both of which can be recycled to recover circular minerals and produce bio-based fuels and chemicals by, e.g., thermochemical recycling technology namely fast pyrolysis, for circular bioeconomy. In this paper, three different paper sludge samples collected in The Netherlands and Spain were analyzed by thermogravimetric analysis, moisture analysis, ash analysis, CHNS elemental analysis, powder X-ray diffraction, and X-ray fluorescence spectrometry. Fast pyrolysis of paper sludge was carried out in a lab-scale continuous stirred tank reactor at 500 ± 10 °C with a paper sludge feeding rate of 1 kg h−1. The recovery of circular minerals, which are mainly calcium carbonate, is 87.1 ± 2.2 % (on mineral basis). The yields of fast pyrolysis bio-liquid and biochar are 49.2 ± 6.7 wt% (on biomass basis, equivalent to 23.7 ± 2.2 wt% on paper sludge basis) and 23.8 ± 8.3 wt% (on biomass basis). Fast pyrolysis bio-liquid is a diluted aqueous containing various oxygenates (major, including alcohols, acids, benzenoid aromatics, aldehydes, ketones, ethers, and esters) and hydrocarbons. Liquid-liquid extraction of the fast pyrolysis bio-liquid using CH3OH/H2O and SO2/H2O was further performed to obtain an improved bio-liquid with relatively high concentration of the desired bio-based chemicals (namely benzenoid aromatics with the concentration of 53.1–65.9 area%). Both SO2/H2O and CH3OH/H2O show high liquid-liquid extraction efficiency to concentrate the benzenoid aromatics for 3.4–11.0 times. This work shows the fast pyrolysis followed by liquid-liquid extraction for the valorization of paper sludge, of which the former has been recently demonstrated on a pilot-scale unit in industry. However, the latter still needs to be further developed by, e.g., focusing on the extraction solvent and continuous liquid-liquid extraction process integrated to fast pyrolysis.

Coupling Electrochemical Leaching with Solvent Extraction for Recycling Spent Lithium-Ion Batteries.

We propose coupling electrochemical leaching with solvent extraction to separate and recover Li and Co from spent lithium-ion batteries (LIBs). Electrochemical leaching occurs in the aqueous electrolyte for converting solid LiCoO2 into soluble Li+ and Co2+, in which electrons act as reductants to reduce Co(III) to Co(II). Simultaneously, solvent extraction occurs at the interface of aqueous and organic phases to separate Co2+ and Li+. By capturing and utilizing the protons from P507, leaching yields for both Co and Li exceed ∼7 times than acid leaching without solvent extraction. The extraction efficiency of Co2+ reaches 86% at 60 °C, 3.5 V, while simultaneously retaining the majority of Li+ in the H2SO4 solution. The total leaching amount was improved because the organic phase provides protons to help the leaching of Co2+, and the continuous extraction process of Co(II) maintains the low Co2+ concentration in the aqueous solution. The synergistic interaction between electrochemical leaching and solvent extraction processes significantly reduces the consumption of chemicals, enhances the utilization efficiency of protons, and simplifies the recovery process. The leaching kinetics of Li and Co both conforms well to the residue layer diffusion control model and the activation energy (Ea) values of the leaching for Li and Co are 4.03 and 7.80 kJ/mol, respectively. Lastly, the economic and environmental assessment of this process also demonstrates the advantages of this method in reducing inputs, lowering environmental pollution, and enhancing economic benefits.

Application of artificial intelligence combined with near infrared spectroscopy in the continuous counter-current extraction process of Angelica dahurica formula granules

The establishment of near infrared (NIR) spectroscopy model mostly relies on chemometrics, and spectral analysis combined with artificial intelligence (AI) provides a new way of thinking for pharmaceutical quality inspection, new algorithms such as back propagation artificial neural networks (BP-ANN) and swarm intelligence optimization algorithms such as sparrow search algorithm (SSA) provide core technical support. In order to explore the application of AI in the pharmaceutical field, in this study, Angelica dahurica formula granules with a relatively complex system were selected as the research object. Quantitative analysis models were established by using partial least squares regression (PLSR) with a micro-NIR spectrometer, and BP-ANN modeling results were compared. For the best PLSR models of six characteristic components in the continuous counter-current extract of Angelica dahurica, R2v of imperatorin was lower than 0.90, and the RPD values of imperatorin, phellopterin, and isoimperatorin were even lower than 1. When the prediction model established by SSA-BP-ANN was used for quantitative analysis, R2v of six components were all higher than 0.92, and the RPD values all higher than 1.5, which proved that the BP-ANN method was better than PLSR. This study confirmed that in the continuous counter-current extraction progress of Angelica dahurica formula granules, the use of micro-NIR spectrometer combined with AI could realize the rapid prediction of the contents of six characteristic components. The comparison results provided a scientific reference for the process analysis and on-line monitoring in the production process of traditional Chinese medicine by micro-NIR spectrometer combined with AI.

Novel low-temperature continuous phase-transition extraction process for efficient peanut oil production

Novel low-temperature continuous phase-transition extraction process for efficient peanut oil production

A two-stage stochastic preference analysis on group decision making with interval additive preference relations

Interval additive preference relation (IAPR) is an efficient tool for describing the uncertain pairwise comparisons between alternatives in group decision-making (GDM). Existing GDM methods with IAPRs view the preference value as a whole and establish concrete conflict/consensus mechanisms for fusing individual opinions while neglecting the stochastic preference and aggregation modes to meet the different demands of decision. Thus, to reflect the stochastic characteristic in both preference representation and group preference aggregation, this paper presents a novel two-stage stochastic preference analysis on GDM with IAPRs. In first stage, the method involves extracting stochastic additive preference relations (SAPRs) from the IAPRs. A preference relations matrix is then established using a logarithmic least squares model applied to the SAPRs. In second stage, the weighted preference matrix is synthesized by combining the preference relations matrix with the decision makers’ weight space. This leads to the computation of positive and negative ideal preference solutions, as well as positive and negative preference distances. Subsequently, the relative preference closeness is calculated based on these distances. Relative ranking results are determined by an algorithm evaluating pairwise comparisons among alternatives, resulting in transitional preference rankings. The second stage involve deriving ranking acceptance indices and ranking confidence degrees through a continuous extraction process, facilitating the establishment of the ultimate best preference rankings. The proposed method’s effectiveness and validity are demonstrated by numerical examples and Monte Carlo simulations.

Stability of a tilted granular monolayer: How many spheres can we pick before the collapse?

The triggering of avalanches is investigated using discrete element simulations for a process of random extraction of spheres. A monolayer, formed by identical spheres in a hexagonal configuration, is placed on a tilted plane surrounded by a small fence that sustains the spheres, mimicking the disposal of fruits in the market. Then, a random continuous extraction process of spheres is imposed until the collapse. For this simple numerical experiment, a phase diagram was obtained to visualize the occurrence of avalanches triggered by vacancies as a function of the tilting angle, system size, and friction coefficient. More importantly, a subzone was found where we can predict the critical number of extractions until the avalanche takes place. The prediction is made from an evolution model of the average coordination number based on statistical considerations. The theoretical prediction also gives a constant critical void fraction of spheres, which implies the system collapses at a critical packing fraction.

Pilot-scale continuous biogenic silica extraction from rice husk by one-pot alkali hydrothermal treatment and ball milling

BackgroundRice husk is the most silicon-rich renewable biomass and can be used as a raw material for producing silicon-based materials. With the increasing interest in utilizing rice husk as a renewable resource, the development of a robust silica extraction method is required. In this study, a one-pot alkali hydrothermal and ball-milling continuous silica extraction method was developed at the pilot scale.ResultsThree residence times (50, 100, and 150 min) were selected to compare the performance of the continuous extraction process depending on the residence time. The silica production was 4.09, 2.67, and 2.22 kg day−1 while the silica extraction yield was 52.8, 69.1, and 86.0% at resident times of 50, 100, and 150 min, respectively. The energy consumption for producing 1 kg of silica from rice husk was 51.6, 47.7, and 47.4 MJ kg−1 at resident times of 50, 100, and 150 min, respectively. The one-pot continuous silica extraction process was performed for 150 h to verify the stability of the process. During long-term operation, the process exhibited a constant solid content and stable silica extraction yield. The silicate solution obtained by the one-pot continuous process was successfully used to synthesize size-controlled spherical silica particles, which had a purity of 99.1 wt% and amorphous structure.ConclusionsOverall, this study presents a novel continuous silica extraction method for the efficient recovery of silica from rice husk-based biorefineries.Graphical abstract

Modeling and application of continuous ion exchanges process for lithium recovery from salt lake brine

A composite model has been developed to simulate and optimize the continuous multi-column lithium adsorption based on the continuous adsorption of lithium from high Mg/Li ratio brines. The model not only simulates all the adsorption columns of the adsorption process, but also the auxiliary equipment connected to the adsorption columns such as pumps and valves, to describe the multi-column continuous lithium extraction process in detail. To improve the efficiency of lithium extraction, a 4-zone, 20-column carousel-type continuous lithium extraction process was proposed and optimized using the composite model. When the feed flow rate was set to 25 mL/min in the adsorption zone, 8 mL/min in the washing zone and 15 mL/min in the product zone, the Li+ extraction rate in the adsorption zone was 98.26%, the lithium loss in the washing zone was 16.12%, the magnesium removal rate in the washing process was 98.77%, the concentration of lithium solution obtained in the product zone was 488.55 mg/L, and the magnesium-lithium ratio was 6.45, with a lithium recovery of 79.68% for the whole continuous lithium extraction process. Overall, the continuous carousel lithium extraction process achieved the expected magnesium separation and continuous lithium extraction from the brine of the Qarhan Salt Lake.

Towards energy efficient scheduling in the olive oil extraction industry: Comparative assessment of energy consumption in two management models

• Energy Use Efficiency and Specific Energy in olive oil mill was evaluated. • Batch and continuous extraction processes were compared. • The Overall Equipment Effectiveness in batch and continuous olive mill was evaluated. • The energy consumed in the batch system is double that of the continuous one. • Batch system performance is nearly half of continuous one. Although olive oil is one of the most important food products throughout the Mediterranean region, the main consideration in configuring and operating extraction plants is still the quantity of crop that will be brought by the individual growers, who are often of small and medium size. On this basis, the common configuration is the batch processing line (Ba-PL) for small and medium capacities, with malaxers arranged in parallel, or in larger-capacity industrial mills, the arrangement of malaxers in series for simulation of continuous processing (Co-PL). A review of literature to date reveals that there have been no assessments of the energy use and scheduling strategies for these two processes, therefore the current study undertakes such assessment and comparison of the Ba-PL and Co-PL configurations, within a single mill facility. The results show that energy output for Ba-PL was 105,570.00 MJ day −1 based on inputs of 3212.76 MJ day −1 , while outputs from Co-PL reached 422,280.00 MJ day −1 from inputs of 6740.38 MJ day −1 . Given that the yield of oil is almost the same in the two processes, the Net Energy (NE) for Ba-Pl then results as 10,2357.24 MJ day −1 versus 41,5539.62 MJ day −1 for the Co-PL configuration, and moreover the later process is seen to achieve almost double the Energy Use Efficiency, at 62.65 versus 32.86 in Ba-PL. Finally, the Overall Equipment Effectiveness (OEE) analysis of performance for the two processes shows values of 93.1 % for the Co-PL configuration but only 51.2 % for Ba-PL, due mainly to dead times in throughput on the Ba-PL machinery, resulting in a 44.7 % decrease in the values for the Performance parameter. The conclusion is that to meet the needs of small producers, there must be new management approaches and improvement in the energy use for batch processing. Some strategies could be: – measure the oil content and moisture in input batches using rapid, non-destructive methods, so that homogeneous batches can be pooled before processing; – reduce dead time by developing automated systems for pumping the olive paste from the malaxers to the separation decanter; – even in the case that they are non-homogenous, consider pooling undersized batches so as to avoid mass flows far below the malaxer capacities. Throughout the Mediterranean, olive oil production using batch processing remains very substantial, therefore further studies are required for the identification and evaluation of solutions for optimising this process.

Simulation separation of triglycerides from Calophyllum inophyllum oil with continuous countercurrent extraction process using Aspen HYSYS

The trends of industry 4.0 transform a process design to a cost-effective development with digital simulation. The objective of this study was to simulate the separation and purification of triglycerides from crude Calophyllum inophyllum oil with a continuous countercurrent extraction method using Aspen HYSYS V.11 to find the appropriate binary parameter coefficients and predict the optimal conditions. It is expected that the oil’s purity suitable with the edible oil standards (minimum 96% triglycerides and 0.3% free fatty acids). The variables used are the flow rate (n-hexane + oil) to methanol and the total mass ratio of solvent to oil. The C. inophyllum oil used contains 63.91% triglycerides, 15.76% free fatty acids, 12.25% diglycerides, and 4.66% monoglycerides. It was evaluated by applying NRTL (Non-Random Two Liquid) and UNIQUAC (Universal Quasi Chemical) fluid packages with binary interaction parameters of UNIFAC-VLE, UNIFAC-LLE, Immiscible, and Modified (fitting parameters). The most suitable fluid package and binary interaction parameter pairing was achieved by combining NRTL fluid package with Modified binary interaction. The highest purity of triglycerides was 92.86%alongside a simulation error of 0.01% while the free fatty acid was 2.17% and 0.91%, respectively, at solvents (hexane and methanol) to oil mass ratio of 6:1 with a hexane-oil to methanol flow rate ratio of 6:15 (LPH/LPH). By upscaling the n number in the extractor, this model can predict the best result of separation and purification of triglycerides with the highest purity of triglycerides and free fatty acids were 96.736% and 0,0001%, respectively. Thus, the edible oil standards can be met.

In vitro antilithiatic and antioxidant potential of ethanolic extract of bauhinia variegata leaves

Calcium oxalate crystals are responsible for formation of urinary calculi. Traditional therapy based on plants and herbal resources have found beneficial for treatment of kidney stones. The present study aimed to screen antilithiatic activity and antioxidant potential of ethanolic extract of Bauhinia variegate leaves. The ethanolic extract of leaves was obtained through continuous heat extraction process and evaluated for the presence of secondary metabolites, total phenolic content and total flavonoid contents. The high phenolic content in leaves is attributable to the presence of phenol, flavonoid, and tannin which all have antioxidant properties, and same was evaluated and confirmed using nitric oxide scavenging method and assessing reducing power of extract. Antilithiatic potential of few secondary metabolites like triterpenoids was confirmed by evaluation calcium oxalate dissolving ability of plant’s ethanolic extract. The urinary calculi dissolving ability was of extract was assessed in vitro. The overall findings confirmed the antilithiatic and antioxidant potential of ethanolic extract of Bauhinia variegate Leaves.

Microdroplet-based continuous countercurrent extraction with high phase ratio

A microdroplet-based continuous countercurrent extraction process with a high phase ratio (60–110) is proposed in this work. A countercurrent extraction apparatus containing a cross-flow T-junction microdisperser and a milli-scale column was established, and phenol extracted from water and transferred to n-octanol was used as the model system. The diameters of the microdroplets formed by the microdisperser were studied, and these ranged from 160 to 220 μm with a uniform diameter distribution and a relative standard deviation of < 15%. The hold-ups of the two phases in the countercurrent column were investigated, and a prediction model was established. The effects of the experimental parameters, namely, the circulation ratio, flow rate, phase ratio, and column length, on the extraction efficiency, volumetric mass transfer coefficient (Koa), and theoretical stage were studied. The value of Koa ranged from 0.087 to 0.352 s−1 within the scope of the experiment, and the theoretical stage value of 2 was achieved with a column height of only 25 cm under certain conditions, indicating a higher mass transfer efficiency compared with traditional devices. The mechanism of mass transfer intensification was discussed and identified to be dependent on the microscale diameter and uniform diameter distribution of the droplets.

Characterization of Wet Olive Pomace Waste as Bio Based Resource for Leather Tanning.

Olive mill wastes represent an important environmental problem. Their high phenol, lipid, and organic acid concentrations turn them into phytotoxic materials. Specifically, wet olive pomace (WOP) is the waste generated in the two-phase continuous extraction process. WOP is a paste with around 60% water. The total volume of WOP generated is around 0.25 L/kg of olives processed. Its current waste management practices result in environmental problems as soil contamination, underground seepage, water-bodies pollution, and foul odor emissions. Some valorization alternatives include composting, biological treatments, direct combustion for energy production, or direct land application. The leather industry is making great efforts to apply cleaner processes while substituting chemical products for natural products. In this way, different alternatives are being studied, such as the use of zeolites, triazine derivatives, grape seed extract, olive leaf extract, etc. In this work, the use of wet olive pomace is presented as a possible alternative to conventional vegetable tannins (mimosa, quebracho, chestnut, etc.). Although different projects and studies have been developed for the valorization of olive mill wastes, there is completely a new approach to the WOP application for tanning purposes. This study shows that WOP has a significant number of polyphenolic substances, so it has a great potential to be used as a tanning agent. Specifically, this study has been able to determine that, of the polyphenols present in WOP, 39.6% correspond to tannins that are capable of tanning the skin. Additionally, it contains 14.3% non-tannins, that is, molecules that by themselves do not have the capacity to tan the leather but promote the tanning mechanism and improve the properties of the tanned leather.

Zeytinyağı üretim aşamalarının zeytinyağının fizikokimyasal özellikleri ve fenolik bileşenleri üzerine etkisi

Aims: In this study, it was aimed to investigate the effect of industrial-scale continuous extraction process stages (crushing, malaxation and decantation) on physicochemical (oil contents, L*, a*, b*, free acidity, peroxide values) and bioactive properties (total phenolic content, antioxidant activity and phenolic compounds) of olive oil. Methods and Results: The samples of olive, olive paste after crushing and malaxation, and olive oil after decantation, which were obtained from olive oil factory, were used for analyses. The highest oil (56.80%) and the lowest total phenolic (160.70 mg L-1) contents were determined after malaxation process at 35°C for 20 min. The free fatty acid value of olive oil increased from 1.68% to 2.46%, but the peroxide value of oil decreased from 12.5 meq O2 kg-1 to 1.5 meq O2 kg-1 after decanter. The L*, a* and b* values of olive oils were determined between 73.82 and 82.04, -12.60 and -3.71, 14.22 and 45.78, respectively. Moreover, phenolic compounds were not significantly affected from industrial oil extraction process (p&amp;gt; 0.05). The minimum oleic acid (68.58%), and the maximum linoleic acid (11.57%) and palmitic acid (14.66%) concentrations were observed in olive oil obtained from malaxed olive paste. Conclusions: The results of oil yield, fatty acid composition and total phenolic content of samples showed significant differences after the malaxation process. Significance and Impact of the Study: It has been determined that the malaxation process is the extraction stage which significantly affects the quality of olive oil.

Hepatoprotective Potential of Methanolic and Aqueous Extract of Chenopodium botrys against Lead-induced Toxicity

Background: Chenopodium botrys L. is local to Europe and Asia and established in North America. The plant commonly used for the treatment of disease. The medicinal use of Chenopodium botrys is mainly due to mythology rather than scientific proof. Objectives: To evaluate the hepatoprotective potential of methanolic and aqueous extract of Chenopodium botrys against lead-induced toxicity. Materials and Methods: The aerial parts of Chenopodium botrys were extracted by the continuous hot extraction process using acetone and methanol as a solvent and the aqueous extract of the plants were obtained by the cold maceration process. Liver tissue was treated with 5 ppm Lead Acetate and 5 mg/ml of acetone methanol and aqueous extract of Chenopodium botrys. During the study, biochemical indices like lipid peroxidation (LPO), Protein levels and enzymatic activities of alkaline phosphatase (ALPase), acid phosphatase (ACPase) and succinate dehydrogenase (SDH) were measured. Results: The current study report that protein levels and enzymatic parameters of alkaline phosphatase as well as succinate dehydrogenase declined significantly while levels of lipid peroxidation and acid phosphatase increased significantly in lead acetate exposed goat liver homogenates as compared to control groups. Co-administration of herbal methanol and aqueous extract of Chenopodium botrys (5 mg/ml) along with 5 ppm lead acetate to liver homogenate exerted an ameliorative effect and maintained the studied parameters closed to control group. Conclusion: Chenopodium botrys is endowed with hepatoprotective activity. It can be taken as one candidate for the development of hepatoprotective agents because of its good safety profile.

Red 3BS dye extraction in liquid surfactant membrane using continuous extractive reactor process

Nowadays, the use of liquid membrane process in treating dye waste solution is more preferable compared to the batch mode as it provides higher recovery performance and huge treated volume. The aim of this paper is to determine the extraction efficiency of using continuous liquid surfactant membrane (CLSM) process for extraction of reactive dye Red 3BS in order to ensure that LSM process more applicable and commercialize in industries. Liquid membrane process comprises of three liquid phases which are external (dye aqueous solution), organic liquid membrane and internal aqueous phase was developed. Liquid membrane and internal aqueous phase were emulsified and dispersed into the wastewater solution (feed/dye aqueous phase) to be treated. The organic liquid membranes contain Aliquat 336, D2EHPA, Sorbitan Monooleote (Span 80) and kerosene as an extractant, synergist extractant surfactant and diluents, were used respectively. The sodium hydroxide (NaOH) was used as stripping agent in internal aqueous phase for the recovery process. The main factors studied for continuous dye extraction process were agitation speed, retention lime and treatment ratio. The system shows stable performance within 15 min duration of continuous extraction time along the process. The results showed that almost 100 % of Reactive Red 3BS ions were successfully extracted at the optimum conditions of 250 rpm agitation speed, 1: 7 of treatment ratio and 5 min of retention time. Therefore, as a conclusion, CLSM can be proposed as a very promising method for extraction of Red 3BS.

Continuous extraction of Spirulina platensis biopigments using different extraction sequences

The use of microalga Spirulina is developing rapidly in the industry. Spirulina biomass is widely used in the food, pharmaceutical and cosmeceutical industry because it is rich in biochemicals and antioxidants that are beneficial to human health. This study aimed to determine the biopigment contents in S. platensis and examine the sequences of continuous extraction process to obtain the optimal biopigment yields. Biopigments of S. platensis extracted in this study were total chlorophyll of 52.28 μg/mL (25.28 μg/mL chlorophyll a and 27 μg/mL chlorophyll b), total carotenoid of 7.9 μg/mL and phycocyanin of 0.020 mg/L. In addition to biopigments, a residue in the form of solid powder was also produced at 20.7 % of biomass. Simultaneous extraction of chlorophyll and total carotenoids was successfully applied in this study, while the optimal phycocyanin extraction should be further developed. The optimal extraction sequence of biopigments was extraction of chlorophyll then carotenoid with low heating and followed by extraction of phycocyanin.

Demonstration of a continuous counter-current extraction process based on a non-heterocyclic N-donor ligand NTAamide(n-Oct) for trivalent actinides/lanthanides separation

To achieve the effective separation of trivalent lanthanides and actinides, a novel NTAAMIDE process based on a non-heterocyclic N-donor NTAamide(n-Oct) extraction system has been developed. It was shown that NTAamide(n-Oct) could extract Am3+ and Eu3+ rapidly to achieve equilibrium within 10 min and has a large loading capacity of 0.75 mol Eu3+/mol NTAamide(n-Oct) in pH = 3.0 HNO3 solution. Meanwhile, relatively high nitrate concentration and low temperature are beneficial for increasing the distribution ratios of metal ions. Further back extraction experiment indicated that both 3.00 mol/L HNO3 and 0.50 mol/L glycollic acid with pH = 4.0 HNO3 could quantitative strip Am3+ and Eu3+ at three stages, while 5 mmol/L TEE-BisDGA was able to selective strip Eu3+. In addition, total organic carbon analysis, FT-IR, 1H NMR, ESI-MS, and extraction measurements revealed that NTAamide(n-Oct) with extremely low solubility in the aqueous phase showed outstanding acid tolerance and irradiation stability. Finally, an enlarged bench test performed by mixer-settler enabled isolating 96.13% Am3+ from macro amount of rare earth elements with decontamination factor of Am3+/Eu3+ as 1320, demonstrating good application prospect for the NTAAMIDE process in the areas of An3+/Ln3+ separation.

Polymers for electronics: a new process under development

The experts at Seqens are working on the implementation of a continuous liquid-liquid extraction process. In OPE journal, the company provides an update on the development

Condensation Behavior of Magnesium Metal in Argon Gas

The condensation behavior of magnesium vapor in argon was studied. Thermodynamic analysis showed that magnesium vapor condensation was controlled by partial pressure and temperature and that temperature was the main factor affecting condensation. When the actual magnesium vapor partial pressure was 371.2 Pa, the magnesium vapor changed from gas to liquid and then to solid. Experimental results showed that droplet magnesium with particle sizes of 0.15 to 1.04 mm, transitional condensed magnesium with particle sizes of 2 to 25 μm and powdered magnesium with particle sizes of 0.5 to 8 μm were obtained at 1000 °C and 0.2 m3/h. This phenomenon occurred as the temperature in the constant temperature zone increased from 1000 °C to 1200 °C. The initial temperature of the droplet condensation zone increased from 618 °C to 776 °C; the initial temperature of transitional condensation zone was 492 °C to 552 °C and the initial temperature of the powder condensation zone 420 °C to 458 °C. When the argon flow rate increased from 0.1 to 0.4 m3/h, droplet magnesium decreased from 52.68 to 11.32 pct and the powder magnesium increased from 24.06 to 57.98 pct. Controlling the temperature and gas flow, different magnesium crystalline microstructures were obtained, which provided a means for magnesium vapor condensation in a continuous magnesium extraction process.