Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Qiuping Li,Shaopeng Gu,Liang Yu,Jingmeng Dong,Zerong Duan
Chromium (Cr) slag, a byproduct of steelmaking, is an important recyclable secondary resource. The preparation of Na 2 CrO 4 from Cr slag has the potential to enhance the economic value of the slags and address environmental challenges linked to Cr(VI). This study investigated the heating processes of Cr slag without and with 30 wt.% Na 2 CO 3 under different atmospheres (air and argon) from 30 ℃ to 1400 ℃. The results showed that 30 wt.% Na 2 CO 3 reacted with Cr 2 O 3 and FeCrO 4 , starting to form Na 2 CrO 4 at 915 ℃ in air. When the heating temperature exceeded 1200 °C, Na 2 CrO 4 started to volatilize, which can be collected. Conversely, heating Cr slag with Na 2 CO 3 in argon generated NaCrO 2 without Cr volatilization. This research proposed a green one-step and cost-effective method for Na 2 CrO 4 preparation: Cr slag heated with 30 wt.% Na 2 CO 3 in air to 1400 ℃. It can use the residual heat from steelmaking, contributing to the recovery and utilization of secondary resources.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Yun Guo,Hong-Yi Li,Shuo Shen,Jie Cheng,Jiang Diao,Bing Xie
Chromium sludge is a hazardous solid waste which cannot be effectively treated but only piled up and abandoned, causing serious environment pollution and resource wasting. This work proposes an effective novel process to separately recover all resources in chromium sludge via a sustainable way. The obtained acid solving liquid from chromium sludge is desiliconized by cationic flocculant (PCAM) to induce coprecipitation of polysilicate gel and PCAM , which mixture is calcinated to generate the product of white carbon black in purity of 94.35% with a recovery of 92.58%. After desiliconization, V in the solving liquid is selectively extracted by microemulsion (ME), which is recovered as V 2 O 5 in purity of 99.34% with a recovery of 95.53% by the subsequent procedure of stripping-precipitation-calcination. The Fe 3+ in raffinate is reduced to Fe 2+ cations by Na 2 SO 3 , and is then recovered by H 2 C 2 O 4 precipitation to generate the FeC 2 O 4 product in purity of 99.12% with a recovery of 98.25%. Cr 3+ cations in residual solution are recovered by alkaline precipitation and calcination to generate the Cr 2 O 3 product in purity of 98.25% with a recovery of 92.68%. This work provides fresh penetrations into the synchronous detoxification, resource recovery and value-added utilization of hazardous industrial solid wastes.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
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IF 7.8
Lanbin Wang,Yangming Xu,Yanping Ma,Yu Chen,Anju Yang,Guixiang Gan,Yaguang Du,Yan Sun
Chromite ore processing residue (COPR) and copper slag (CS) are industrial waste slags that cause environmental pollution and require effective treatment. This study proposes a new strategy for the co-treatment and resource utilization of COPR and CS. Under the optimal conditions (liquid-solid ratio of 9.99; H 2 SO 4 concentration of 0.85 M; the CS/COPR mass ratio of 9.98%; temperature of 88.20 ℃; and duration of 60 min), the reduction efficiency of Cr(VI) reached 99.48%, and the total Cr leaching concentration of residue reached 1.35 mg/L, which was below the USEPA regulatory limit of 5 mg/L. In addition, the detoxicated slag containing 61.44 wt% Fe 2 O 3 can be used as a raw material in the steel industry. Through kinetic, characterization, and DFT analyses, the effective remediation of Cr(VI) in COPR by CS is a combination of adsorption and reduction. The unreacted shrinkage nuclear reaction model under the control of the surface chemical reaction is the most suitable model to describe the process, and when the apparent activation energy is 63.90 kJ/mol, the apparent rate equation is: 1-(1-x) 1/3 = 1·371×10 7 [CS/COPR] 2·35004 [H 2 SO 4 ] 2·3945 [L/S] 1·95338 exp(–63·90/RT) This is an important study for waste-waste co-treatment and resource utilization of industrial waste.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Qiuping Li,Shaopeng Gu,Liang Yu,Funian Han,Jingmeng Dong,Chunmei Li,Jiaqi Jia
An effective and environment-friendly method for preparing NaVO 2 , which can be used as an energy storage material, from Na 2 CO 3 roasted vanadium-chromium slag was proposed using water as the leaching medium. Vanadium-chromium slag with 30 % Na 2 CO 3 was heated in air and argon atmospheres from 30 °C to 1000 °C, respectively. The results show that vanadium compounds converted to NaVO 3 while chromium compounds to Na 2 CrO 4 under air. NaVO 3 and Na 2 CrO 4 were water-soluble making the separation of vanadium and chromium complicated. NaVO 3 and Na 2 CrO 4 were water-soluble making the separation of vanadium and chromium complicated. Heating vanadium-chromium slag in an argon atmosphere caused Fe 2 VO 4 to react with Na 2 CO 3 , forming NaVO 2 and NaFeO 2 below 1000 °C. However, chromium compounds unreacted in argon. NaFeO 2 was insoluble, while NaVO 2 was water-soluble with a leaching efficiency exceeding 70 %. Notably, the characteristic peak of V(III) in NaVO 2 was first found to be −532.00 ppm by the liquid 51 V NMR spectrum. This method represents a novel, green strategy for the resource utilization of vanadium-chromium slag, involving Na 2 CO 3 roasting in an argon atmosphere to produce NaVO 2 . It offers a promising approach to reduce the cost of NaVO 2 battery production and support its commercialization.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
POWDER TECHNOLOGY
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2024
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IF 4.5
Hang Jin,Bihe Yuan,Xichen Xu,Qingquan Ding,Yue Kong,Man Yang,Chao Liu,Shibin Nie
The harmless treatment and resource utilization of chromite ore processing residue (COPR), a consequential byproduct of chromate production, carry profound significance. In this study, corn stalk, an agricultural waste, was used to generate reducing substances through high-temperature and vacuum treatments and was successfully used to detoxify COPR. The acid leaching method combined with multi-step purification was employed to extract iron and aluminum, two crucial metallic elements, from COPR. The successful preparation of iron hydroxide and ultrafine aluminum hydroxide (ATH) was achieved. The prepared ATH has an average particle size of 8.124 μm, with a highly uniform distribution, enabling it to be a promising environmentally friendly inorganic flame retardant. This study not only effectively addresses the issue of pollution caused by COPR but also presents a novel approach to utilizing industrial and agricultural wastes, thereby promoting the maximization of resource utilization.
研究领域:
环境科学
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材料科学
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废弃物处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yongzheng Jia,Yu Qing,Baoyan Feng,Yiwei Zhong,Lei Dai,Mingyong Wang
Green separation and efficient extraction of vanadium and chromium from vanadium-chromium leaching solution are serious challenges for the utilization of chrome-vanadium slag. A green sucrose reduction-H 2 O 2 selective oxidation route is proposed for deep separation of vanadium and chromium from vanadium-chromium leaching solution based on different redox properties. Eh-pH diagram of V-Cr-H 2 O system and existence forms of vanadium and chromium ions are calculated. Obvious difference of redox properties between V(V) and Cr(VI) exists in acidic environment. The dependences of selective separation on pH for reduction, temperature, m (sucrose) /m (Cr(VI)) and n (H2O2) /n (V(V)) are studied. The concentration ratio of vanadium to chromium in solution after selective separation of chromium decreases from 1.6 to 0.06. The extraction ratios of Cr 2 O 3 and V 2 O 5 are 96.3% and 93.8%, respectively. The redox behavior of V(V) and Cr(VI) is revealed. Cr(VI) and V(V) are reduced to Cr(Ⅲ) and V(IV) by 5-hydroxymethylfurfural, a hydrolysate of sucrose, and then V(IV) is selectively oxidized to V(V) by H 2 O 2 . Cr 2 O 3 ·n(H 2 O) and ammonium polyvanadate obtained by hydrolysis and ammonium precipitation are calcined to Cr 2 O 3 and V 2 O 5 , respectively. Cr 2 O 3 with the purity of 99.4% can be used as high-quality pigment. The purity of V 2 O 5 meets the requirements of YB/T 5304–2011 for 98 V 2 O 5 .
研究领域:
冶金工程
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环境科学
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DOI
高影响因子
TALANTA
·
2018
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IF 4.244
Yunxia Ma,Yonglei Chen,Juanjuan Liu,Yangxia Han,Sudai Ma,Xingguo Chen
As we know, hexavalent chromium (Cr(VI)) was usually used as an additive to improve the color fastness during the printing and dyeing process, and thus posing tremendous threat to our health and living quality. In this work, the dual emissive carbon dots (DECDs) were synthesized through hydrothermal treatment of m -aminophenol and oxalic acid . The obtained DECDs not only exhibited dual emission fluorescence peaks (430 nm, 510 nm) under the single excitation wavelength of 380 nm, but also possessed good water solubility and excellent fluorescence stability. A ratiometric fluorescent method for the determination of Cr(VI) was developed using the DECDs as a probe. Under the optimal conditions, a linear range was obtained from 2 to 300 μM with a limit of detection of 0.4 μM. Furthermore, the proposed ratiometric fluorescent method was applied to the analysis of Cr(VI) in textile, steel, industrial wastewater and chromium residue samples with satisfactory recoveries (88.4–106.8%).
研究领域:
环境化学
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分析化学
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材料科学
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DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 15
·3076
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IF 4.6
Shuai Zhu,Junru Chen,Yun Zhu,Baoke Zhang,Jing Jia,Meng Pan,Zhipeng Yang,Jianhua Cao,Yating Shen
Chromium slag sites pose severe environmental risks due to hexavalent chromium (Cr(VI)) contamination, characterized by high mobility and toxicity. This study focused on chromium-contaminated soil from a historical chromium slag site in North China, where long-term accumulation of chromate production residues has led to serious Cr(VI) pollution, with Cr(VI) accounting for 13–22% of total chromium and far exceeding national soil risk control standards. To elucidate Cr(VI) transformation mechanisms and elemental linkages, a combined approach of macro-scale condition experiments and micro-scale analysis was employed. Results showed that acidic conditions (pH < 7) significantly enhanced Cr(VI) reduction efficiency by promoting the conversion of CrO42−to HCrO4−/Cr2O72−. Among reducing agents, FeSO4exhibited the strongest effect (reduction efficiency >30%), followed by citric acid and fulvic acid. Temperature variations (−20 °C to 30 °C) had minimal impact on Cr(VI) transformation in the 45-day experiment, while soil moisture (20–25%) indirectly facilitated Cr(VI) reduction by enhancing the reduction of agent diffusion and microbial activity, though its effect was weaker than chemical interventions. Soil grain-size composition influenced Cr(VI) distribution unevenly: larger particles (>0.2 mm) in BC-35 and BC-36-4 acted as main Cr(VI) reservoirs due to accumulated Fe-Mn oxides, whereas BC-36-3 showed increased Cr(VI) in smaller particles (<0.074 mm). μ-XRF and correlation analysis revealed strong positive correlations between Cr and Ca, Fe, Mn, Ni (Pearson coefficient > 0.7,p< 0.01), attributed to adsorption–reduction coupling on iron-manganese oxide surfaces. In contrast, Cr showed weak correlations with Mg, Al, Si, and K. This study clarifies the complex factors governing Cr(VI) behavior in chromium slag soils, providing a scientific basis for remediation strategies such as pH adjustment (4–6) combined with FeSO4addition to enhance Cr(VI) reduction efficiency.
研究领域:
环境科学
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土壤化学
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污染控制
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地球化学
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环境修复
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）