Study on the Method of Lime Cream to Remove Sodium from Fly Ash Red Mud by Soda-Lime Sintering Process

2013 ◽  
Vol 726-731 ◽  
pp. 2790-2794
Author(s):  
Guang Hui Bai ◽  
Lin Lv ◽  
Tong Song Wang ◽  
Peng Cheng Li ◽  
Cai Ling He
Keyword(s):  
Fly Ash ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Red Mud ◽  
Removal Rate ◽  
Soda Lime ◽  
Sodium Content ◽  
Sintering Process ◽  
Solid Ratio ◽  
Sodium Removal

It is the first time to remove sodium from the fly ash red mud by soda-lime sintering process to determine whether the fly ash red mud can be used in cement production. This paper studies the effects of the reaction time, the reaction temperature, the ratio of liquid to solid, and the amount of sodium removal agent on the removal of milk of lime method of fly ash red mud in sodium. The optimal reaction conditions are that: the reaction time is 120min, the reaction temperature is 90°C, the ratio of liquid to solid ratio is 6:1, and the ratio of sodium removal agent Ca (OH) 2 to the red mud of Na2O use ratio is 9:1. Under this condition, the sodium removal rate (Na2O, the same below) to 57.2%, the total sodium content in fly ash red mud decreases from 4.7% to 1.8% after sodium removal, achieving the expected goal.

Characterization and Application Process Optimization of CuO/γ-Al2O3 Catalyst in CWAO Technology

2014 ◽  
Vol 1008-1009 ◽  
pp. 338-341
Author(s):  
Yu Xiu Zhang ◽  
Cheng Zhi Wang ◽  
Yong Li Zhang ◽  
Zhang Wei Li
Keyword(s):  
Reaction Time ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Reaction Temperature ◽  
Removal Rate ◽  
Influence Factors ◽  
Carrier Distribution ◽  
Influent Water ◽  
Catalyst Dosage ◽  
Stirring Intensity

CuO/γ-Al2O3 catalyst was used to deal with the waste leachate in CWAO technology of, and the SEM and TEM characterization showed: active component in the surface of the carrier distribution is uniform; In CWAO process, six factors, based on the CODCr removal rate and turbidity removal rate, the biggest impact factor is reaction temperature, and the influence factors of the top three were reaction temperature, catalyst dosage and reaction time. The influence factors of those in the bottom three are influent water pH, oxygen partial pressure, stirring intensity, and three factors of influence on the strength is close. Optimizing operation process, in order: reaction temperature of 200 °C, catalyst dosage of 1.5 g, oxygen partial pressure of 2.0 MPa, stirring intensity 800 rpm, influent water pH of 7.0, the reaction time of 70 min.

Reactive Adsorption Desulfurization of Thiophene in n-hexane over Oxides Adsorbent of NiO-ZnO/Al2O3-SiO2

2013 ◽  
Vol 455 ◽  
pp. 43-47 ◽  
Author(s):  
Xiao Ming Hou ◽  
Ben Xian Shen ◽  
Ji Gang Zhao
Keyword(s):  
Reaction Time ◽  
Structural Properties ◽  
Reaction Temperature ◽  
Chemical Process ◽  
Removal Rate ◽  
Precipitation Method ◽  
Initial Concentration ◽  
Reactive Adsorption ◽  
Adsorption Desulfurization ◽  
Co Precipitation

The oxides adsorbent of NiO-ZnO/-Al2O3-SiO2 was prepared by co-precipitation method. SEM, XRD and BET studies were performed to understand the structural properties of the adsorbent. And the adsorbent can be used for the desulfurization of thiophene in n-hexane as model gasoline. Removal rate of thiophene increased with increasing reaction time. Removal rate of thiophene in equilibrium decreases with increasing the initial concentration of thiophene. The extent of adsorption in adsorbent increased with increasing the initial concentration of thiophene. The removal rate of thiophene increases with increasing reaction temperature, it showed that the desulfurization is a chemical process not a physical process.

Experimental Researches on the Preparation of High-Efficient Active Floridin by Mixed Acids

2012 ◽  
Vol 510 ◽  
pp. 713-718
Author(s):  
Ming Yong Shu ◽  
Hai Ying Yin ◽  
Guang Hui Liu
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Volume Ratio ◽  
Raw Material ◽  
Activation Effect ◽  
Solid Ratio ◽  
High Efficient ◽  
Main Factors ◽  
Experimental Researches ◽  
Mixed Acids

Taking ca-bentonite as the raw material, the activation effect of active floridin prepared by mixed acids of H2SO4, HCl and C2H2O4 is studied. The research results indicate that the main factors influencing the activity and decolorization ratio of floridin include volume ratio of mixed acids, liquid-to-solid ratio, reaction temperature and reaction time. When the volume ratio of mixed acids H2SO4: HCl: C2H2O4=5:5:1, liquid-to-solid ratio =4:1, reaction temperature 80 and reaction time 4h, it is possible to prepare high-efficient active floridin.

Separation of Gallium from Aluminum in Fly Ash Digested Solution by Soda-Lime Sintering Process

2012 ◽  
Vol 560-561 ◽  
pp. 474-481 ◽  
Author(s):  
Guang Hui Bai ◽  
Tong Song Wang ◽  
Peng Cheng Li ◽  
Lin Lv ◽  
Cai Ling He
Keyword(s):  
Carbon Dioxide ◽  
Fly Ash ◽  
Power Plant ◽  
Mother Liquor ◽  
Soda Lime ◽  
Decomposition Temperature ◽  
Sintering Process ◽  
Time Flow ◽  
Decomposition Time ◽  
First Time

It is the first time to determine whether gallium in fly ash was dissolved out with aluminum and study how to separate gallium from aluminum and recover it, tracking and analyzing the gallium in the digested mother liquor from a power plant fly ash extracting Al2O3 by soda-lime sintering process. Carbon dioxide decomposition was performed to the digested mother liquor, exploring the influences on separation of gallium from aluminum from carbon dioxide decomposition time, flow rate, and carbon dioxide decomposition temperature. The results show that when feeding CO2 into the solution, aluminum was firstly dissolved out as the form of Al(OH)3 and then gallium. When carbon dioxide decomposition time, flow velocity and carbon dioxide decomposition temperature were 30min, 100mL/(min • L) and 40°C, respectively, the ratio of aluminum to gallium was from 1028 down to 200. Under this condition, most of aluminum was dissolved out from the solution but gallium was still in it, thus successfully separating gallium from aluminum and leading to a better condition of subsequent process of extracting gallium.

Resource recovery of waste incineration fly ash: Synthesis of tobermorite as ion exchanger

1999 ◽  
Vol 14 (11) ◽  
pp. 4437-4442 ◽  
Author(s):  
Zhidong Yao ◽  
Chikashi Tamura ◽  
Motohide Matsuda ◽  
Michihiro Miyake
Keyword(s):  
Fly Ash ◽  
Reaction Time ◽  
Sodium Hydroxide ◽  
Hydrothermal Treatment ◽  
Reaction Temperature ◽  
Sodium Hydroxide Solution ◽  
Waste Incineration ◽  
Naoh Solution ◽  
Temperature Time ◽  
Waste Incineration Fly Ash

Tobermorite was synthesized successfully from waste incineration fly ash by hydrothermal treatment in the presence of sodium hydroxide solution. The tobermorite synthesis was examined as a function of reaction temperature, time, and NaOH concentration. The formation of tobermorite was identified in all of the fly ash treated with NaOH at 180 °C, followed by the minor generations of sodalite and cancrinite phases with increasing NaOH concentration and extending reaction time. The NaOH-treated fly ash revealed the uptake behaviors for Cs+ and NH4+, whereas the fly ash untreated with NaOH solution did not show that. The uptake amounts of resulting products were also determined: 0.40 mmol/g for Cs+ and 0.35 mmol/g for NH4+ in the fly ash treated with 2.0 M NaOH at 180 °C for 20 h.

Oxidative Desulfurization Performance Optimization of Tert-Amyl Hydroperoxide

2014 ◽  
Vol 686 ◽  
pp. 66-72
Author(s):  
Ning Bo Huo ◽  
Zhi Gang Liu
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Performance Optimization ◽  
Removal Rate ◽  
Influence Factors ◽  
Oxidative Desulfurization ◽  
Oxidative Reaction ◽  
Catalyst Amount ◽  
Reaction Condition ◽  
Model Oil

The desulphurization experiment of oil-soluble oxidant tert-amyl hydroperoxide with dibenzothiophene dissolved in decalin as model-oil was researched. Characterisation on oxidation product was made, and dibenzothiophene removal rate was computed. The influence factors of the oxidative reaction regent amount and the condtions of reaction temperature and reaction time were optimized and compared. The best reaction condition was reaction temperature 90°C, reaction time 3 h, ratio of oxygen to sulfur 4:1, catalyst amount 0.12 g. Dibenzothiophene removal rate reached 97% in this reaction condition.

Fabrication and Analysis of β-Sialon Whiskers from Fly Ash by Carbon Thermal Reduction-Nitridation

2015 ◽  
Vol 723 ◽  
pp. 610-614
Author(s):  
Jing Zhang ◽  
Jiang Long Yu ◽  
Huan Zhao ◽  
Jun Shuai Liu
Keyword(s):  
Fly Ash ◽  
Reaction Time ◽  
Carbon Content ◽  
Reaction Temperature ◽  
Carbothermal Reduction ◽  
Thermal Reduction ◽  
Optimal Temperature ◽  
Nitridation Process ◽  
Best Parameter ◽  
Sialon Powder

β-Sialonwhiskers which the molecular structuralformula of β-Sialonis Si3Al3O3N5(z = 3) were synthesized from fly ash and graphite under appropriate technological conditions by carbothermal reduction–nitridation process. The effects of carbon content, reaction temperature and reaction time on synthesis ofβ-Sialonwere analysed by XRD, SEM techniques. The results proved that, the condition of the carbon content over 80% is the best parameter to promote theβ-Sialon powder production. Compared to other kinds of temperature, 1430 °C is the optimal temperature to promoteβ-Sialon powder generation. Compared to 3h, holding time of 6h is promoting theβ-Sialon powder generation.The main morphology of β-Sialon was rod-like whisker.

Magnesium Recovery from Desiliconization Slag of Nickel Laterite Ores by Carbonization

2013 ◽  
Vol 813 ◽  
pp. 255-258 ◽  
Author(s):  
Wen Ning Mu ◽  
Shuang Zhi Shi ◽  
Yu Chun Zhai
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Flow Rate ◽  
Temperature Reaction ◽  
Nickel Laterite ◽  
Experimental Conditions ◽  
Solid Ratio ◽  
Carbonation Process ◽  
Laterite Ores ◽  
Orthogonal Experiments

This work examines the recovery of magnesium from desiliconization slag of nickel laterite ores by carbonation process. The effects of reaction temperature, reaction time, liquid/solid ratio and CO2 flow rate on magnesium dissolution are investigated. The optimized experimental conditions of recovering magnesium were gained by the analysis of orthogonal experiments.

Removal of Manganese(II) Ions from Wastewater by H2O2 as Oxidant

2014 ◽  
Vol 884-885 ◽  
pp. 125-128
Author(s):  
Wen Qiang Yang ◽  
Juan An ◽  
Jian Guo Yin ◽  
Xiao Li Yuan ◽  
Wen Tang Xia
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Calcium Oxide ◽  
Reaction Temperature ◽  
Removal Rate ◽  
Treated Wastewater ◽  
Manganese Removal

Removal of manganese (II) ions from wastewater by H2O2as oxidant was studied. Effects of reaction temperature, hydrogen peroxide concentration, reaction time and calcium oxide concen-tration on the manganese removal were investigated. The results indicated that the removal rate of manganese exceeded 99.9% and the Mn (II) ions concentration of treated wastewater was lower than 0.1 mg·L-1under the conditions of reaction temperature 55 °C, concentration of H2O20.1 mL·L-1, reaction time 70 min, concentration of CaO 0.25 g·L-1.

Study on Removal Arsenic from Iron Ore with Arsenic in Sintering Process

2011 ◽  
Vol 284-286 ◽  
pp. 238-241 ◽  
Author(s):  
Qing Lu ◽  
Shu Hui Zhang ◽  
Xiao Hu
Keyword(s):  
Reaction Temperature ◽  
Iron Ore ◽  
Arsenic Removal ◽  
Removal Rate ◽  
Decomposition Reaction ◽  
Holding Time ◽  
Sintering Process ◽  
Mass Content ◽  
Powder Content ◽  
Coke Powder

The physicochemical properties of iron ore with arsenic in South of China was analyzed by chemical analysis, XRD, high power microscope. The effects of various factors on arsenic removal in sintering process were studied and the optimal technique parameters were obtained. The results show that the mineral of iron ore with arsenic in South of China mainly is composed of magnetite and gangue, in which arsenic with 0.282% mass content exists as FeAsS and few as As2S3. The oxidation and thermal decomposition reaction of FeAsS occurs in sintering process. Under feeble oxidation atmosphere the arsenic removal rate of iron ore along with reaction temperature increases, and the holding time elongates, or the coke powder content rises. The optimal removal arsenic process parameter is: reaction temperature 1050~1100°C, holding time 8~15min, and coke powder content 6%.

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