Yufeng Guo

• Chinese Academy of Sciences

Identifying alternative protein sources is crucial in view of the shortage of protein resources. A new strain Geotrichum candidum IBB69 was isolated for microbial protein production in this study. The protein yield, biomass, and specific protein production (the ratio of total intracellular and extracellular protein to biomass) of G. candidum IBB69...

The efficient recovery of iron, nickel and chromium from laterite nickel ore by the pyrometallurgy process is important for the stainless steel industry. In general, the increasing Al2O3 content of the low-grade laterite nickel caused the high melting temperature of slag and affected the recovery rates of valuable elements. The study on the element...

The application of coherent oxygen injection improves the smelting efficiency and product quality by promoting the homogenization and impurities removal effects in electric arc furnace (EAF) steelmaking process. CH 4 is widely applied as surrounding gas in traditional coherent jets, which inescapability generates some greenhouse gases (GHG), and ag...

The temperature of hot metal (HM) is crucial for the energy input and smelting in the electric arc furnace (EAF) steelmaking process with HM and scrap as the charge structure. However, due to the influence of many factors in the heat dissipation in HM transportation before the EAF steelmaking process, the temperature drop of HM before charged is us...

In the iron and steel industry, evaluating the energy utilization efficiency (EUE) and determining the optimal energy matching mode play an important role in addressing increasing energy depletion and environmental problems. Electric Arc Furnace (EAF) steelmaking is a typical short crude steel production route, which is characterized by an energy-i...

EAF steelmaking is characterized by complex charge structure, vigorous chemical reaction, and intensive energy source. The existed disadvantages lead to the big difference of temperature and chemical composition in molten bath, and finally make it difficult for end point controlling. There is still a lack of research on reaction regularity and smel...

EAF steelmaking process is served as energy intensive fields, which releases massive high-temperature flue gas with consumption of extensive raw materials and energies. The effective utilization of waste heat is essential for energy conservation and emission reduction in the iron and steel industry. Scrap preheating with flue gas is a high-efficien...

The increase to the proportion of fluxed pellets in the blast furnace burden is a useful way to reduce the carbon emissions in the ironmaking process. In this study, the interaction between calcium carbonate and iron ore powder and the mineralization mechanism of fluxed iron ore pellet in the roasting process were investigated through diffusion cou...

Background: Pyruvate is a widely used value-added chemical which also serves as a hub of various metabolic pathways. The fastest-growing bacterium Vibrio natriegens is a promising chassis for synthetic biology applications with high substrate uptake rates. The aim of this study was to investigate if the high substrate uptake rates of V. natriegens...

Zinc ferrite can be found in zinc-bearing dust in ironmaking and steelmaking. It is difficult to be recovered due to its stable properties. The magnetization roasting and ammonia leaching method were used to separate iron and zinc from zinc ferrite in this study. Thermodynamic analysis showed that the key to the selective reduction of zinc ferrite...

Zinc-containing dust can be found in ironmaking and steelmaking, and it is an important secondary resource of zinc. Zinc-containing dust from an electric furnace was used as a raw material to study the phase transformation behavior of the dust using a calcification roasting process and the zinc–iron separation behavior by using ammonia leaching. Th...

To solve the problems of low consolidation strength and high energy consumption of vanadium-titanium magnetite (VTM) pellets, high-pressure grinding rolls (HPGR) technology can be used to pretreat the raw materials (VTM concentrate). Compared with other technologies, HPGR pretreatment has the advantages of high efficiency and low energy consumption...

Vanadium tailings from vanadium extraction by a sodium roasting process are solid waste and cannot be used in sintering and ironmaking due to their high sodium content. In this paper, a calcification and reduction roasting process was proposed to remove sodium from vanadium tailings. The effects of Ca(OH)2 addition, reduction temperature, and roast...

The blast furnace process is developed to produce Fe-Ni-Cr alloy (also called stainless steel master alloys) by smelting nickel laterite in China. However, how to achieve high recovery of chromium from nickel laterite become a challenge due to the limited smelting temperatures in a blast furnace. In this study, the behavior of chromium during the s...

In this manuscript, we consider the accuracy of end-point carbon content prediction affected by oxygen injection in multiple stages of electric arc furnace (EAF) melting process. Such a prediction would help to further evaluate process control strategies and optimize overall operation of the electric arc furnace. Principal component analysis (PCA)...

The molten salt chlorination method is more suitable to produce TiCl4 using titanium-containing materials with high contents of CaO and MgO in China. However, there is a large amount of molten salt chloride slags generated from the molten salt chlorination process, which contains a variety of chlorides and is difficult to treat, often causing serio...

During the roasting process of fluxed pellets in a coal-fired rotary kiln, the incomplete combustion of pulverized coal injection accelerates deposit formation, which further limits the production efficiency of fluxed pellets. In order to eliminate the above problem, this study investigated the influence of MgO on deposit formation mechanism. The t...

Vanadium tailings are a common solid waste in the vanadium industry. As they are rich in Fe, vanadium tailings could be a potential raw material for the blast furnace. However, the presence of approximately 4% Na2O in vanadium tailings is a major impediment to its return to the blast furnace. A novel method for removing sodium from vanadium tailing...

Titanium slags produced through ilmenite electric furnace smelting contain 60–80%TiO2, a vital titanium resource in the titanium industry. The processing and utilization of titanium slag is faced with many challenges, such as complex mineral structures, high requirements, severe environmental pollution, and heavy additives and energy consumption. T...

Separation of iron and titanium by reduction-corrosion method from ilmenite had the advantages of less pollution, simple process, and low cost compared with other methods. To identify the determinants for corrosion reaction of reduced ilmenite, the corrosion electrochemistry of metallic iron in ammonium chloride solution was carried out. The metall...

The application of fluxed pellets in iron making industry has attracted considerable attention because of the better metallurgical properties than acid pellets and environmental friendliness compared to sinters. However, fluxed pellets with different binary basicity (CaO/SiO2) exhibited significant differences in phase composition, microstructure a...

The migration characteristics of heavy metals during the melting process were one of the key factors for safe treatment and resource utilization of incineration fly ash (IFA). In this paper, the material variation of heavy metal elements of Pb, Zn, Cu, and Fe during the IFA melting process was simulated by HSC 6.0 chemistry software. The effects of...

The CaO-SiO2-MgO-Al2O3 slags with high alumina content are widely applied in various pyrometallurgical processes. However, for super-high-alumina slags, especially for those with alumina content of more than 25 wt%, there is a lack of relevant studies about the properties of slag. The melting behavior, viscosity, structural property, and crystalliz...

Background Pichia pastoris is a widely used host organism for heterologous production of industrial proteins, such as cellulases. Although great progress has been achieved in improving protein expression in P. pastoris , the potential of the P. pastoris expression system has not been fully explored due to unknown genomic impact factors. Recently, w...

The deposit phenomenon is frequently observed and could prevent the smooth running of the production of fluxed iron ore pellets via the coal-fired grate-kiln process in China. This study investigated the effects of unburnt coal on the deposit formation mechanism in a rotary kiln. The experimental results indicated that the unburnt coal significantl...

Zinc ferrite (ZnFe2O4), one of the major forms of zinc in electric arc furnace dust and zinc leaching residue, is very difficult to chemically dissolve in either acidic or alkaline solutions. It is therefore necessary to study the extraction of zinc from zinc ferrite to achieve the full recovery of the zinc resources. In this paper, CaO was used to...

Titanium metal and alloy are key materials for technological development, which significantly promote the development of the hightech economy in China. The consumption of high-end titanium materials and the developmental level of the titanium industry are important indexes of a country’s comprehensive power. However, at present, the application amo...

There is 3%∼5%tin remaining in the Inner Mongolia tin-bearing middling obtained by flotation, which is a valuable secondary resource of tin. To effectively recover this tin, selective separation tin from tin-bearing middling by sulfide roasting using anhydrous gypsum (CaSO4) as the sulfur agent was proposed in this study. The removal behaviors of t...

Compared to iron ore acidic pellet production, the deposit problem in kiln became more severe to produce iron ore fluxed pellets. This study characterized the deposit samples in a grate-kiln process for iron ore fluxed pellet production. The deposited samples were analyzed by chemical analysis, XRD, SEM-EDS, and thermodynamic software. The deposits...

Proteomic analysis with data-independent acquisition (DIA) approaches represented by the sequential window acquisition of all theoretical fragment ion spectra (SWATH) technique has gained intense interest in recent years because DIA is able to overcome the intrinsic weakness of conventional data-dependent acquisition (DDA) methods and afford higher...

Deposit formation in the coal-fired rotary kiln is frequently found in the production of fluxed iron ore pellets by the grate-kiln process and affects normal production. In this paper, the effects of pellet basicity (CaO/SiO2 mass ratio) on the simulated deposit formation were investigated. The results show that the porosity of deposits samples inc...

Yeast cells suffer from continuous and long-term thermal stress during high-temperature ethanol fermentation. Understanding the mechanism of yeast thermotolerance is important not only for studying microbial stress biology in basic research but also for developing thermotolerant strains for industrial application. Here, we compared the effects of 2...

The air volume distribution is one of the important factors of iron ore sintering speed and sinter strength, which plays an important part in achieving a high sintering productivity. The sintering process can be divided into two stages at the time of over-wetting layer disappearance. Increasing the air volume before the over-wetting layer disappear...

The formed deposits wear out of refractory wall linings in the rotary kiln and may cause production disturbances. This study describes the chemical composition and mineralogical phase components at the deposit/refractory interface in the rotary kiln for fluxed iron ore pellets production. The main phases of refractory bricks are corundum and mullit...

The titanium resources in Panxi reign, China, have a high-impurities content of Ca and Mg, which is usually processed by the molten salt chlorination process. This process allows higher Ca and Mg content in its furnace burdens. However, there is a huge amount of molten salt chlorinated slag produced by this process, consisting of complex compounds...

Background Pichia pastoris is a widely used host organism for heterologous production of industrial enzymes and other proteins, such as cellulase applied in various industries. By developing rational and irrational engineering strategies, great progress has been achieved in improving protein expression in P. pastoris. However, due to unknown genomi...

Fluorine-bearing iron ore is unique and complex. Serious preheating and roasting problems of fluorine-bearing iron concentrate pellets appear during the industrial production by the grate-kiln process. Besides, specularite has low hydrophilicity, undesirable particle size and shape, dense and smooth particle surface and poor assimilation performanc...

The deposit-forming problem is one of the main bottlenecks restricting the yield and production benefit of iron ore pellets produced by coal-fired rotary kilns. In order to implement measures to ensure the efficient production of pellets by coal-fired rotary kilns, the mechanism and influencing factors on the deposit formation were reviewed. The pe...

The effects of F⁻ concentration, leaching temperature, and time on the Ti leaching from Ti-bearing electric furnace slag (TEFS) by [NH4⁺]-[F⁻] solution leaching process was investigated to reveal the leaching mechanism and kinetics of titanium. The results indicated that the Ti leaching rate obviously increased with the increase of leaching tempera...

Background Saccharomyces cerevisiae is widely used in traditional brewing and modern fermentation industries to produce biofuels, chemicals and other bioproducts, but challenged by various harsh industrial conditions, such as hyperosmotic, thermal and ethanol stresses. Thus, its stress tolerance enhancement has been attracting broad interests. Rece...

Limestone fluxed iron ore pellets are reduced in CO-rich atmosphere generally accompanied by swelling behavior. If the reduction swelling index (RSI) exceeds the normal range (≥20%), it will seriously hinder the stable and anterograde production of iron making. To better guide the industrial production, the effect of binary basicity (CaO/SiO2) on t...

Electric arc furnace (EAF) steel bottom-blowing can effectively improve the temperature and composition uniformity of the molten pool during smelting process. To explore the effect of molten-steel characteristics on bottom-blowing at various stages of smelting, we divided the smelting process of the EAF into four stages: the melting stage, the earl...

A novel direct-current electric arc furnace (DC-EAF) was designed and constructed in this study for experimentally investigating high-titanium slag smelting, with an emphasis on addressing the issues of incomplete separation of metal and slag as well as poor insulation effects. The mechanical components (crucible, electrode, furnace lining, etc.) w...

A huge amount of coke breeze with its particles size smaller than 10 mm, is generated and accumulated during coke production, transportation and crushing process, which cannot be effectively used, causing wasting of coke resource. Cold briquetting of coke breeze was investigated in this study to produce formed coke with certain size and strength to...

Background Saccharomyces cerevisiae is widely used in traditional brewing and modern fermentation industries to produce biofuels, chemicals and other bioproducts, but challenged by various harsh industrial conditions, such as hyperosmotic, thermal and ethanol stresses. Thus, its stress tolerance enhancement has been attracting broad interests. Rece...

R31 filter aid containing macromolecular long-chain organic compounds with carboxyl, sulfonic, amide groups was used to improve the filtration of fine hematite concentrate in this study. The carboxyl, sulfonic and amide groups adsorbed on the surface of hematite concentrate particles. The macromolecular long-chain organic compounds flocculated fine...

The effects of titanium slag on the roasting and metallurgical properties of fluorine-bearing iron concentrate pellets were experimentally investigated in this study. Results show that the compression strength of fluorine-bearing iron concentrate pellets improved up to 3700 Newton/Pellet and the suitable range of roasting temperatures expanded 150...

Microbial-produced branched-chain higher alcohols (BCHAs), such as isopropanol, isobutanol, and isopentanol in Escherichia coli, have emerged as promising alternative biofuels under development. Elucidating and improving the tolerance of E. coli to BCHAs are important issues for microbial production of BCHAs due to their physiological inhibitory ef...

As an efficient stirring method, bottom-blowing technology was applied in the present electric arc furnace (EAF) steelmaking process to improve the dynamic conditions of the molten steel. This article describes the development of a numerical model to simulate the 3D multiphase flows (gas, steel, and slag). Comparisons among uniform and non-uniform...

Slag basicity (mass ratio of CaO to SiO2) is an important index to ensure smooth operation and efficient separation between the metal and slag within the metallurgical industry. Effects of basicity of the high titanium slag on the recovery of iron and vanadium, the separation behaviors between iron and slag, as well as the slag foaming behavior dur...

In vanadium extraction converter steelmaking, the swirl-type oxygen lance has been applied to improve the dynamic condition of the molten bath reaction to achieve a higher oxidation rate of vanadium and better vanadium slag quality, because the swirl-type jet can generate not only axial and radial forces but also tangential ones. Recently, the swir...

As an important substance (slag) with the absorption capacity to the harmful elemental phosphorus, saturated slag demanded discharging for both the requirement of the generation of foaming slag in the furnace and slag replacement to strengthen the effect of dephosphorization. This paper reviewed during the electric arc furnace (EAF) steelmaking pro...

Gas-based reduction roasting magnetic separation process was conducted to separate and recover iron and titanium from oxidized vanadium titano-magnetite (VTM). The effects of reduction temperature, gas composition, reduction time, grinding fineness, and magnetic field intensity on the efficiency of Fe-Ti separation were investigated. Under the cond...

Shortly after publication of the original article [1], the authors noticed a few errors which are outlined below.

Background High-temperature fermentation is desirable for the industrial production of ethanol, which requires thermotolerant yeast strains. However, yeast thermotolerance is a complicated quantitative trait. The understanding of genetic basis behind high-temperature fermentation performance is still limited. Quantitative trait locus (QTL) mapping...

In the present study, FactSage predictions were systematically compared from the present experimental results and the experimental data from the literatures in the CaO-SiO2-MgO-Al2O3-“TiO2” system. These results reveal that the discrepancies are significant between the predictions and experimental results. The predicted primary phases in CaTiO3 and...

Mass spectrometry (MS) technology has a special advantage in species determination for protein-rich samples which requires identification of species-specific peptides. However, for species discrimination of highly homologous proteins, it remains challenging to select the species unique peptides with routine proteomics approaches. In this work, we c...

The melting behavior of titanium-bearing electric furnace slag is a key factor for effective smelting of vanadium titanomagnetite in electric furnaces. The melting behavior of synthetically produced CaO-SiO2-MgO-Al2O3-TiO2 slags with different TiO2 contents (48 wt.% to 54 wt.%), CaO/SiO2 mass ratios (0.8 to 1.4), and MgO contents (8 wt.% to 14 wt.%...

Serious deposits in the grate-kiln plant for iron ore pellet production can decline pellets quality and reduce production efficiency. The initial stage of deposit formation is crucial for adhesion and growth of deposit on refractories in the kiln. In this study, the simulated experiments of FeO formation indicated that the high FeO content decrease...

The suppression of titanium oxide reduction enables both successful separation of iron from slag and smooth production operations for the smelting of vanadium titanomagnetite. This study investigates the distribution behavior of titanium between the hot metal and enriched titanium slag during the electric furnace smelting of vanadium titanomagnetit...

The behavior of silicon during smelting of vanadium titanomagnetite metallized pellets in an electric furnace has been investigated thermodynamically and experimentally. Thermodynamic calculations indicated that the activities of free oxygen ion and silicate increase with increasing CaO and MgO content in the titanium slag, whereas silica activity...

Data analysis represents a key challenge for untargeted metabolomics studies and it commonly requires extensive processing of more than thousands of metabolite peaks included in raw high-resolution MS data. Although a number of software packages have been developed to facilitate untargeted data processing, they have not been comprehensively scrutin...

Reduction and smelting of the vanadium titanomagnetite metallized pellets have been experimentally investigated in this study. By using the high-temperature smelting, rapid quenching, and electron probe x-ray microanalysis (EPMA) technique, the effects of basicity, reaction time, and graphite reductant amount were investigated. The vanadium content...

TALENs-assisted multiplex editing (TAME) toolbox was previously established and used to successfully enhance ethanol-stress tolerance of S. cerevisiae laboratory strain. Here, the TAME toolbox was harnessed to improve and elucidate stress tolerances of S. cerevisiae industrial strain. One osmotolerant strain and one thermotolerant strain were selec...

To gain deep understanding of yeast cell response to heat stress, multiple laboratory strains have been intensively studied by genome-wide expression analysis for mechanistic dissection of classical heat shock response. However, robust industrial strains of S. cerevisiae have hardly been explored in global analysis for elucidating the mechanism of...

Deposit in the grate-kiln process is a well-known problem for iron ore pellet production. In this study, the deposits in a coal-fired grate-kiln plant for hematite pellet production were characterized to reveal their formation mechanisms. Scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and X-ray powder diffraction (XRD) a...