Controlling two-phase foam through the Fenton oxidation process
Hongqiang LiZetong LuWen ZhangYangge ZhuHuifang ZhengQiushi LiaoDanzhang LiuHuihua LuoShaoxian SongRichard M. Kasomo
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Direct discharge of wastewater from flotation processes can pose a significant threat to environmental protection due to the presence of residual organic surfactants.These surfactants can decrease the surface tension of aqueous solutions and generate stable foam, which can interfere with further purification treatments.To address this issue, sodium oleate (NaOL), one of the most commonly used surfactants, was studied, and the Fenton oxidation process was utilized to degrade NaOL and mitigate foam generation.In this work, the foamability of NaOL before and after Fenton oxidation pretreatment, the optimal conditions for NaOL degradation, and the effect of temperature on the oxidative process were examined.The findings demonstrate that the foamability of NaOL solution is directly proportional to its concentration, and the Fenton oxidation process can significantly reduce the maximum foam volume and half-life period of the foam.Moreover, the activation energy was determined to be 37.60 kJ/mol, indicating that the oxidative reaction proceeds with a low energy barrier.A new process for oxygen enriched air (EA) production has been applied to Claus Process. This process is simple and requires few process units. Matlab and Aspen Hysys have been used for simulations and system sizing. The results demonstrate that it could be an alternative to traditional EA processes from an economical point of view.
Claus process
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(1−x)PZT-xSBT ceramics were prepared by a solid-state mixed oxide method. Phase characteristics of (1−x)PZT-xSBT ceramics showed a PZT phase and new phase in the compositions with 0.1 ≤ x ≤ 0.3, while a mainly new phase was observed in the composition with x = 0.5. The tetragonality (c/a) of PZT phase decreased with increasing in SBT content up to x = 0.3. SEM micrographs of the sample surface showed equiaxed grains of the PZT phase and irregularly-shaped grains of the new phase in samples with 0.1 ≤ x ≤ 0.3. The 0.5PZT-0.5SBT sample showed mainly irregularly-shaped grains of the new phase. The ferroelectric properties of these samples showed that the addition of small amounts of SBT (x = 0.1) into PZT increased the remanent polarization.
Equiaxed crystals
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A high strength joint obtained at relatively low temperature and pressure by diffusion bonding has always been a challenge for manufacturing of aluminum alloy heat sinks. In this work, joining of 6063Al alloys was performed by a novel liquid and solid phase diffusion bonding method with an Zn–30Sn hypereutectic interlayer. It was achieved at a heating temperature of 360 °C and a pressure of 1 MPa. A 6063Al joint bonded was composed mainly of Zn–Al eutectoid phases and had a higher strength than the base metal. During the diffusion bonding process, the joint was constituted of Sn–Zn eutectic phases and η-Zn phases at initial diffusion stage. The proportion of Sn–Zn eutectic phases gradually decreased and Zn–Al eutectoid phases increased in a joint through inter-diffusion between base metal and interlayer with increasing of holding time. The η-Zn phases finally transformed into Zn–Al eutectoid phases with depleting of Sn–Zn eutectic phases, in which only 0.02 wt% Sn element was remained in the joint. The liquid and solid phase diffusion mechanisms were revealed. The penetration of Sn to the grain boundary of Al alloy happened under an assistance of the Zn diffusion. The Al originated from base metal interdiffused with η-Zn phases, forming Zn–Al eutectoid phases.
Base metal
Diffusion bonding
Diffusion welding
Atomic diffusion
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A novel efficient, energy saving acetonitrile continuous refining process was designed according to the feature of the original process based on the current propylene-ammoxidation process in domestic that produces acrylonitrile with acetonitrile as byproduct to solve the problems such as highly waste of material and energy, low product recovery, and so on. By process and energy saving analysis, some special distillation technologies such as pressure-swing distillation, multi-effect distillation were applied in novel process. Meanwhile, the large general process simulation software was used to simulate and optimize the designed process, and the best process operation parameters were obtained. Simulation results showed that the product quality indicator of novel process achieves the international superior grade, and saves 39.6% energy compared with the original process, while its recovery was improved to 93%.
Ammoxidation
Process Simulation
Refining (metallurgy)
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The effect of phase transformation and fine particle dispersion on densification behavior of high purity nanocrystalline alumina was investigated. The γ/α phase ratio of the mixture compacts were affected detrimentally by sinterability and phase transformation of α-phase alumina ceramics. The densification was significantly deteriorated with increasing γ-phase owing to faceted pores which are caused by the formation of a colony. The faceted pores were not existed in the α- Al2O3 ceramics with 10% γ-phase. Densification of the 10% γ-phase dispersed α-Al2O3 ceramics was significantly enhanced by rapid transformation of α-alumina. The grain growth was effectively inhibited by a small amount of nanoparticle dispersion for the alumina ceramics. As a result, dense nanostructured alumina can be achieved in the 10% γ-phase dispersed α-Al2O3 ceramics, even sintering at 1400oC for 3 hours.
Nanocrystalline material
Particle (ecology)
Alumina ceramic
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Бұл зерттеужұмысындaКaно моделітурaлы жәнеоғaн қaтыстытолықмәліметберілгенжәнеуниверситетстуденттерінебaғыттaлғaн қолдaнбaлы (кейстік)зерттеужүргізілген.АхметЯссaуи университетініңстуденттеріүшін Кaно моделіқолдaнылғaн, олaрдың жоғaры білімберусaпaсынa қоятынмaңыздытaлaптaры, яғнисaпaлық қaжеттіліктері,олaрдың мaңыздылығытурaлы жәнесaпaлық қaжеттіліктерінеқaтыстыөз университетінқaлaй бaғaлaйтындығытурaлы сұрaқтaр қойылғaн. Осы зерттеудіңмaқсaты АхметЯсaуи университетіндетуризмменеджментіжәнеқaржы бaкaлaвриaт бaғдaрлaмaлaрыныңсaпaсынa қaтыстыстуденттердіңқaжеттіліктерінaнықтaу, студенттердіңқaнaғaттaну, қaнaғaттaнбaу дәрежелерінбелгілеу,білімберусaпaсын aнықтaу мен жетілдіружолдaрын тaлдaу болыптaбылaды. Осы мaқсaтқaжетуүшін, ең aлдыменКaно сaуaлнaмaсы түзіліп,116 студенткеқолдaнылдыжәнебілімберугежәнеоның сaпaсынa қaтыстыстуденттердіңтaлaптaры мен қaжеттіліктерітоптықжұмыстaрaрқылыaнықтaлды. Екіншіден,бұл aнықтaлғaн тaлaптaр мен қaжеттіліктерКaно бaғaлaу кестесіменжіктелді.Осылaйшa, сaпa тaлaптaры төрт сaнaтқa бөлінді:болуытиіс, бір өлшемді,тaртымдыжәнебейтaрaп.Соңындa,қaнaғaттaну мен қaнaғaттaнбaудың мәндеріесептелдіжәнестуденттердіңқaнaғaттaну мен қaнaғaттaнбaу деңгейлерінжоғaрылaту мен төмендетудеосытaлaптaр мен қaжеттіліктердіңрөліaйқын aнықтaлды.Түйінсөздер:сaпa, сaпaлық қaжеттіліктер,білімберусaпaсы, Кaно моделі.
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The nationally-recognized Susquehanna
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singing that will take you to new
heights!
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Heat sensitive
Microwave heating
Scale-up
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