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RISS 인기검색어
- 검색키워드
- 저자 : Baozhong Ma (검색결과 5 건)
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Extraction of valuable components from coal gangue through thermal activation and HNO3 leaching
Shuang Shao,Baozhong Ma,Chengyan Wang,Yongqiang Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Coal gangue has the dual attributes of hazard and resource. With the increasing awareness of resourcesconservation and ecological sustainability, the high-value utilization of coal gangue has attracted activeattention. In this research, thermal activation followed by HNO3 leaching were performed to extract valuablecomponents from coal gangue. Firstly, the activation behavior and phase transformation mechanismduring thermal activation were revealed through the Gibbs free energy calculation and experimentalresearch. After activation, inert kaolinite was converted to active metakaolinite. Subsequently, thepotential-pH diagrams analyses confirmed that the strategy of extracting Al, Ga, and Li into the leachliquor while precipitating Fe into the leach residue was feasible. Meanwhile, systematic leaching experimentsshowed that 95.2% of Al, 56.4% of Ga, and 80.5% of Li were extracted, while only 2.1% of Fe wasdissolved at the optimal conditions. The leaching behavior of each component agreed well with the thermodynamicanalysis. Finally, the raw ore, activated product, and leach residue were analyzed via a suiteof characterization techniques. In contrast to the raw ore and activated product, the leach residue hadlarge BET surface area and high available Si content, and was a promising Si fertilizer source. This studyprovides a useful reference for the high-value utilization of coal gangue.
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Yuqing Zhang,Baozhong Ma,Yingwei Lv,Chengyan Wang,Yongqiang Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
The global trend toward electrification has encouraged lithium’s market position to grow prominently. Spodumene is the focus of lithium extraction owing to its abundant lithium resources. In this study, anovel lithium extraction method was proposed for a-spodumene by combining activated roasting andsulfuric acid leaching. First, the thermodynamics of the roasting process demonstrated that aspodumenewas converted into b-spodumene, which reacted with CaO to produce acid-solubleLiAlSiO4 and CaSiO3 concurrently. The addition of CaO reduced the melting temperature, which promotedthe structural transformation of b-spodumene and further acid leaching. Then, the influences of variousfactors on lithium extraction were investigated by a single-factor test. A lithium leaching yield of 96.18%was obtained under optimum conditions: 20% CaO, roasting temperature of 1200 C, holding time of1.5 h, H2SO4 concentration of 120 g/L, liquid–solid ratio of 7:1 mL/g, leaching temperature of 80 Cand leaching time of 1.5 h. Finally, Li entered into leach liquor by the action of sulfuric acid, and the maincomponents of the leach residue were silicate and calcium sulfate. Compared to the conventional acidapproach, this method has a higher lithium recovery and lower energy and acid consumption (decreaseby approximately 0.42 kg/ kg).
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Huidong Zhou,Yubo Liu,Baozhong Ma,Chengyan Wang,Yongqiang Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
As a critical resource, lithium is necessary for the flourishing of clean energy as an upstream raw material. With the global popularity of lithium batteries and strict requirements for environmental protection, ashort, cost-effective lithium extraction process from a-spodumene was critical. In this paper, a novel processfor efficient and direct extraction of lithium from a-spodumene was proposed. The main contents ofthe process were sodium roasting, water quenching and strengthening leaching. Firstly, the thermodynamicbehavior of the roasting products was analyzed using Factsage 7.0 software. Subsequently, the factorsof lithium extraction were investigated by single-factor condition experiments. And the responsesurface methodology (RSM) was used to carry out the three-factor and three-level Box-Behnken experiments. The investigation revealed that a-spodumene reacted directly with Na2CO3 at high temperature toform Li2SiO3, NaAlSiO4, and Na2SiO3. The stable aluminosilicate structure in a-spodumene was destroyedby the combined effect of sodium roasting and water quenching, which played a significant role in therelease of lithium. In addition, the Na2CO3 dosage dominated the effect of lithium extraction, followedby roasting temperature and roasting time. Based on the model optimization results, the optimal roastingconditions were determined to be roasting at 1100 C for 30 min with the addition of 45% Na2CO3. Theextraction rates of Li and Rb were 95.9% and 90.3%, respectively, whereas those of Al was only 1.5%. This process provides a technological solution for the high-efficiency and synergistic extraction of valuableelements in a-spodumene.
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Xiang Li,Yubo Liu,Weijiao Yang,Baozhong Ma,Yongqiang Chen,Chengyan Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The recovery rates of copper (99 %) and cobalt (93 %) could be significantly increased by adding sodiumsulfate in activated roasting of Cobalt-rich copper sulfide (CRCS). The mechanism and kinetic parametersof CRCS roasting with sodium sulfate addition were not clear. Thus, in this study, the thermal roastingkinetics of carrollite (the predominant cobalt occurrence mineral) in CRCS adding Na2SO4 with an airatmosphere was studied in detail by TG-DTG method. The apparent activation energy (E) and preexponentialfactor (A) were obtained via Flynn-Wall-Ozawa method (FWO) and Kissinger-Akahira-Sunose method (KAS) methods, where E values were 113.89 kJmol1 (KAS) and 120.87 kJmol1(FWO). The thermodynamic parameters of the roasting process were evaluated. The model function forthe carrollite reaction was determined via Malek analysis. The mechanism of sodium sulfate additionin CRCS roasting was studied. Results showed that the addition of sodium sulfate in activated roastingcan promote the transformation of carrollite mineral phase. The activation energy value of the oxidationprocess of carrollite decreases. From the kinetic point of view, the addition of sodium sulfate can promotethe activation roasting.
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Non-salt roasting mechanism of V–Cr slag toward efficient selective extraction of vanadium
Zhichao Yao,Qing Zhang,Ling Wang,Wenjuan Zhang,Baozhong Ma,Chengyan Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Developing a clean method for the sustainable utilization of reducing slag containing vanadium and chromium(V–Cr slag) is necessary, with the non-salt roasting method exhibiting considerable potential. Inthis study, we conducted a detailed analysis of the mechanisms driving non-salt roasting of the V–Cr slagby investigating phase transformations, valence transition, and redistribution of vanadium and associatedtransition elements. Based on our findings, we performed efficient selective extraction experimentsand revealed that spinel (Fe,Mn)(V,Cr)2O4, the carrier of vanadium, is converted to acid-soluble products,including VO2, Mg2V2O7, and Mn2V2O7, and acid-insoluble products, such as (Fe,Cr)2O3, TiO2, MnO2, andFe2TiO5 at a roasting temperature of 700 C; At roasting temperatures > 850 C, MnO2 is converted to halfMn2V2O7 and half (Fe,Cr,Mn)2O3. Vanadium is separated from Fe, Cr, Ti, Si, and half Mn via selective leaching. Under optimized conditions, the leaching efficiency of V reached 94.55%, and those of Fe, Cr, Ti, Si,and Mn were 0.71%, 0.50%, 0.44%, 0.23%, and 50%, respectively. This study provides a technical and theoreticalbasis for cleaner and safer utilization of V–Cr slag.
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