Changliang Shi

Henan Polytechnic University | HPU · College of Chemistry and Chemical Engineering

Heavy medium coal washing technique can achieve deep coal desulfurization and ash reduction. It is an important approach that can ensure clean and efficient utilization of coal. Heavy medium coal washing technique is affected by the efficient and high-quality recovery of heavy medium. While, it has the poor recovery due to the finer particle size a...

The natural flake graphite (GO) with an initial fixed carbon content of 6.23% is purified using flotation combined with alkali-melting acid leaching to obtain the high purity graphite (PG3) for energy storage. The graphite concentrate (PG1) with fixed carbon content of 85.62% is obtained by the selective enrichment of GO particles based on the mult...

The recycling of waste lithium batteries (LIBs) is important for the healthy development of the LIBs industry. In this work, a column fluidized bed was designed to recover graphite powder from waste LIBs, and the phenolic resin-coated recovered graphite powder composites ware prepared by liquid-phase impregnation-carburization method, which effecti...

Poplar waste is used as feedstock to prepare valuable pyrolysis products by pyrolysis under different temperature. The bio-oil is rich in aldehyde with the maximum relative content of 47.15%, which has potential application in chemical industries. Pyrolysis temperature has significantly influenced the composition and heating value of bio-gas. The m...

High-sulfur coal cannot be directly burned and used; moreover, its long-term stacking can easily pollute the surrounding soil and water. Previous studies have determined that high-sulfur coal calcined under an inert gas atmosphere is reducible and can be used to recover Au(S2O3)2³⁻from thiosulfate solutions. However, calcined high-sulfur coal (CHSC...

Magnetic separation photocatalyst-adsorbent (MSPA) is successfully prepared by pyrolysis of cotton stem for rhodamine B and malachite green wastewater removal using one-pot method. The results show that MSPA has the property of magnetism, photocatalytic degradation and adsorption. The adsorption isotherms and adsorption kinetics of rhodamine B and...

The accurate classification of coarse coal slime is the premise of efficient separation. Deep Cone Hydraulic Classifier (DCHC) is a new classification equipment for coarse coal slime classification, the content of fine particles (-0.2 mm) in coarse coal slime can be effectively reduced through classification, so as to create suitable feeding granul...

Microplastics of small sizes and large specific surface areas are very difficult to degrade in the ocean. They spontaneously adsorb marine harmful substances and carry them permanently. Hence, aquatic environments and human health face great threats. Therefore, it is necessary to seek an efficient microplastic removal method. In this study, magneti...

Hydrothermal carbon (HTC) was prepared by the one-step hydrothermal method for Cr (VI) removal from wastewater, which was considered a “green chemistry” method. The specific surface area (SBET) of HTC was 85 m²/g with the pore size in range of 2.0–24.0 nm. FT-IR spectra analysis showed that the HTC had abundant chemical surface functional groups. T...

Mechanical agitation was usually applied to improve the fluidization quality of the fluidized bed. This study aimed to explore the effect of agitation on the fluidization characteristics and separation effect of a gas–solid separation fluidized bed. On the basis of the multiple reference frame model, the fluidized bed under mechanical agitation was...

Iron-containing oxides are the main minerals associated with roasted gold concentrates. The influence of different iron-containing oxides on the gold thiosulfate leaching process is very complex. In this study, we found the use of dry grinding methods can considerably eliminate the adverse effects on gold thiosulfate leaching under wet grinding con...

Layered double hydroxides (LDHs) have been widely used to remove anions from water owing to their ability to exchange interlayer anions. In this study, LDHs synthesized by coprecipitation method were used as raw materials to produce calcined layered double hydroxides (CLDH), in order to investigate the adsorption of gold (I) complexes from a thiosu...

We developed amorphous porous carbon (i.e. humic acid resin-based amorphous porous carbon, HARC800) with the controlled porosity in the ordered structure as anode material for sodium-ion batteries (SIBs) through the optimized annealing process supported by functional lignite and sodium alginate precursors. HARC800 has well-developed interconnected...

With steam and CO2 as gasification agents, four types of gasification cokes were prepared from lignite and anthracite to investigate the adsorption behaviors of phenol onto cokes with different structural and surface properties. The textural parameters indicated that the prepared coke samples presented specific surface areas of 155.37–573.52 m2/g a...

A low-cost and selective adsorbent (referred to as [email protected]) is prepared by modifying crofton weed using 1,3-diaminoguanidine monohydrochloride to achieve Pb(II) removal. Fourier transform infrared spectroscopy analysis results indicate that 1,3-diaminoguanidine monohydrochloride is successfully grafted in the crofton weed after modificati...

To study the effect of copper on gold thiosulfate leaching, the gold dissolution of three different sample powders (gold, gold/copper, and gold/copper oxide) in a solution of 5 mM Cu²⁺, 0.4 M ammonia, and 0.1 M thiosulfate was studied. Scanning electron microscopy analysis showed no sulfur passivation on the gold surface, and there were more promin...

A facile ultrasonication method was used to uniformly mix nanospindle-shaped FeOOH (80–100 nm) and a conductive matrix of graphene oxide (GO) to form FeOOH/GO composites. No carbon peak was observed in the X-ray diffraction pattern, indicating that the graphene oxide did not stack together and that the dispersion of graphene was very high. X-ray ph...

The mechanism that tetrathionates retarded gold dissolution during the anodic process of gold thiosulfate leaching was studied with the help of electrochemical and spectroscopic techniques. The results show that the reduction in gold dissolution did not originate from the increase of a passive layer on the surface. When the gold electrode was contr...

Flotation tailings are by-products of coal preparation plants, which do not only occupy cultivated land but also cause pollution. The high ash content and low calorific value of tailings limit their applications. Deashing is the precondition for the reutilization of flotation tailings. However, it is more difficult to remove ash content from flotat...

The effect of the reduction half reaction of Cu(II) complexes on passivation and gold dissolution in the copper-ammonia-thiosulfate system were studied using electrochemistry and density functional theory (DFT). The results show that the cathodic process accounts for the surface passivation, aside from contributions made by thiosulfate decompositio...

Efficient and instant detection of biological threat-agent anthrax is highly desired in the fields of medical care and anti-terrorism. Herein, a new ratiometric fluorescence (FL) nanoprobe was elaborately tailored for the determination of 2,6-dipicolinic acid (DPA), a biomarker of anthrax spores, by grafting terbium ions (Tb3+) to the surface of ca...

In this study, α-Fe2O3@g-C3N4 photocatalyst was synthesized using an ultrasonic assisted self-assembly preparation method. The α-Fe2O3@g-C3N4 photocatalyst had a stronger optical absorption in the visible light region than pure graphitic carbon nitride (g-C3N4). The Z-Scheme heterojunction between α-Fe2O3 and g-C3N4 significantly inhibited the reco...

Gold thiosulfate leaching have the best prospects for industrial application; however, the effect of polythionate on this system is complicated. Effect of tetrathionate on thiosulfate leaching of gold in a copper–ammonia system over a prolonged period of time was studied in detail. The results show that the gold concentration is higher in the tetra...

In order to investigate bubble size distribution (BSD) in the cyclonic flotation column, a series of tests were conducted to study flow velocity distribution (FVD) and BSD by using the method of particle image velocimetry (PIV). Foaming performance of the n-octyl alcohol is more applicable than both of n-butyl alcohol and terpenic oil in this study...

Bubble-particle interactions play an important role in flotation. This study examines the behaviour of bubble clusters in a turbulent flotation cell. Particularly, the bubble-particle interaction characteristics in flotation are investigated. The bubble size in a flotation column was measured using an Olympus i-SPEED 3 high-speed camera. Relationsh...

Photocatalysts comprising nanosized TiO 2 particles on activated carbon (AC) were prepared by a sol-gel method. The TiO 2 /AC composites were characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, nitrogen adsorption, scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive X-ray (EDX). T...

It's popularized that dry permanent magnetic separator for coal separation in order to achieve desulphurization and dust reduction to ease enviromental pollution. However, due to weak magnetic coal minerals, conventional magnetic separator is far from for effective separation of fine coal. This paper proposes a new type of permanent magnetic separa...