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In order to reduce the operational cost and completely eliminate Fe2+ ion in the original acid-cleaning fluid for the wastewater treatment process of steel factories, a modified process of two-stage counteract/aeration oxidation is applied. Our results indicate that the effluent quality is better to the first class criteria specified in Integrated Wastewater Discharge Standard (GB 8978-1996). Furthermore,...
In order to utilize the both slag and heat energy of the smelting steel slag, the experiments of extracting iron from steel slag were conducted by smelting reduction method, and investigating the effect of temperature and holding time on iron recovery ration. Results show key reduction reaction is (FeO) +C=[Fe]+CO. And maximum reduction ration reaches on 94.82% under optimum temperature 1550°C and...
It is summarized the research hotspots of flue gas desulfurization (FGD) and analyzed the advantages and disadvantages of Limestone-Gypsum wet flue gas desulfurization (WFGD) and microbic desulfurization methods. Put forward a new idea of combining the Limestone-Gypsum WFGD, microbial method with catalytic oxidation of transition metal (Fe3+/Fe2+ galvanic couple) reasonably. Then established the model...
Particles of raw water in Yangzi River were detected by the spectrum and were analyzed by SPSS methods. The results of mean test showed that the non-metallic elements had a significant role on the analysis of variance, and the structures of mineral and organic matter had a great influence on the composition of particles. The results of correlation analysis indicated that there was a significant negative...
Series of pot experiments were performed to determine the effects of cadmium in soil on chlorophyll content, CAT, POD and SOD activities in Brassica juncea. The results indicated that tolerance of Brassica juncea for Cd is stronger. It is able to burgeon and grow all right in the soil added Cd from mg·kg−1 to200mg·kg−1. The biomass of Brassica juncea takes on principle of parabola changes with Cd...
The objective of this paper is to develop a method for estimating the cold storage time of pork using hyperspectra image cubes data accessed by a self-developed Filed Imaging Spectrometer System (FISS). Data were preprocessed by Minimum Noise Fraction (MNF) transform and first derivative to eliminate high-frequency random noise and baseline offset and to improve the multicollinearity. Wilks' lambda...
The mechanism of phosphorus removal by iron-contactor process (PRICP) is illustrated from two aspects: metallic corrosion and phosphorus removal by ferric salt. Advances in PRICP are reviewed to shed some light on the research focus in the future for the sake of in-depth study and wide application.
The effect of metallurgical property of coke and the formation of sulfide phase added with CaO, Fe2O3 and La2O3 have been investigated using contrast test and XRD phase analysis. The results indicate that additives have little impact on coke dropping broken strength, but the wear strength of coke is deteriorated with CaO and Fe2O3 addition and improved with La2O3. The coke reactivity is increased...
By comparative analysis of characteristc distribution, correlation, biological absorption coefficient and the characteristc element pairs of 13 trace elements in Litchi and soils from four production areas, Guangdong province, the results revealed that the characteristic elements of four production areas are Cu, Mg, Zn, Fe, Cr, and the characteristic element pairs are Cu-Li, Cu-Zn, Li-Mg, Li-V, Mg-V,...
The paper is based on actual situation of Chengchao iron mine to study the pillar recovery schemes under challenging conditions. According to the three-dimensional ore body and adjacent rock model, rock mechanics test and analyses, a large-scale physical and technical emulation model was built, after checked by the terrene monitoring data, and then it was used to study the different scheme. The surface...
Organic poly-silicic-ferric (OPSF) coagulant was prepared using dimethyldiallylammonium chloride (DMDAAC) as additive in poly-silicic-ferric (PSF) coagulant. Color removal in treating synthetic dyeing wastewaters by OPSF using jar test was investigated, in comparison with that of PSF coagulant. The results show that OPSF has better performance in color removal than PSF with the decreasing of dose,...
Removing NO3− in polluted groundwater of in-situ leaching uranium mine with iron powder (zero-valent iron, Fe0), DNB, iron powder and DNB are studied. The condition of tests include different pH of solution, dosage of iron powder, and treating time. The experimental results show that over 93% of NO3− in unneutralized polluted groundwater (pH value about 1.46) can be removed with 16.5 g·L−1 iron powder...
Pentachlorophenol (PCP), a notoriously recalcitrant and toxic organic contaminant, was investigated for its degradation with nanoscale Fe and Ni/Fe particles. Compared with the bare nano Fe, the bimetallic Ni/Fe nanoparticles exhibited much higher reactivity. The rate of PCP transformation can be described by pseudo first-order kinetics, and the apparent rate constants were calculated to be 0.04 and...
Mineral processing wastewater of sulfide ore containing dressing pharmacy such as residual xanthate, resulting in many mine ecological deterioration, serious water and soil pollution, human health, agricultural production and fisheries caused great harm, could easily lead to environmental pollution. Therefore, effective method to remove the residual xanthate of mineral processing wastewater no doubt...
Starting notch geometry parameters are key factors affecting fracture splitting quality. As usually used materials in engine crankshaft bearing block, both gray Cast Iron HT150 and ductile iron QT500-7 are selected in this paper. The influence of starting notch geometry parameters on separation force are analyzed by using ABAQUS software. To reduce the separation force in fracture splitting process...
The photodegradation rate of orange G (OG) in aqueous solution was enhanced in the presence of Fe(III)-citrate complexes under Xe lamp irradiation. The reaction kinetics fitted the first order reaction and the photolysis efficiency of OG was dependent on Fe(III) dosage, citric acid concentration, light intensity and initial OG concentration. OH radical is responsible for the increase of OG photolysis...
The by-products ferrous sulphate from titanium dioxide and waste sulfuric acid were used to prepare polyferric sulfate (PFS) through the direct oxidation method. The technical indicators of prepared PFS completely meet national standards when the temperature was 60°C, the strength of mixing was 120r/min, PH1.5–2.0, the ventilation was 2.0L/min. Using the prepared PFS and the purchased PFS to process...
The contents of heavy metals in Aegiceras corniculatum and the acid-leachable contents of heavy metals in the rhizosphere sediments in Luoyang River estuary of Quanzhou Bay were determined, and the concentration and transfer capacity of heavy metals in the different tissues of Aegiceras corniculatum was discussed. The average acid-leachable contents of heavy metals in the rhizosphere sediments showed...
Treatment of arsenic in drinking water has been a difficult problem, especially in the countryside, because of its high cost and inconvenience. Red soil has a relatively high clay minerals and iron and aluminum compounds and must be a natural material to solve this problem. Experimental results show that the red soil from Yuelu mountain had a high arsenic removal rate of 97.1% after 24 hours. The...
The pitting breaking potential (Eb) and repassivation potential (Ep) of 304 stainless steel were studied by electrochemistry method. These potentials were highly affected by the concentration of chloride solution, pH and buffer capacity, which defined as environmental factors. The buffer capacity and the concentration of non-aggressive anions in the solutions show some effects on the pitting initiation...
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