Experimental Study on the Detoxification of Chrome Sludge by Making Bricks

2014 ◽  
Vol 878 ◽  
pp. 708-713 ◽  
Author(s):  
Xiu Lin Yang ◽  
Wei Ye ◽  
Gao Ming Wu ◽  
Wang Sheng Chen ◽  
Jun Han
Keyword(s):  
Experimental Study ◽  
Weight Loss ◽  
Compressive Strength ◽  
Mass Fraction ◽  
Sintering Temperature ◽  
Trivalent Chromium ◽  
National Standards ◽  
Molding Pressure ◽  
Loss On Ignition ◽  
Sintering Time

In order to eliminate the toxicity of chromium sludge, hexavalent chromiumwas changed into trivalent chromium. Chromium sludge, coal and clay were used at the ratio of 0-12%:90-78%:10% to manufacture sludge bricks. Meanwhile, the influences of the sludge mass fraction, molding pressure, sintering temperature and sintering time on weight loss on ignition, chromium leaching concentration, water absorption and compressive strength of bricks were also investigated. The results indicated that the conditions for manufacturing good quality bricks was 8% sludge with 4h of sintering prepared in 20MPa molding pressure and sintered at 950°C, which can reach the national standards (HJ/T 301-2007). Furthermore, wastes were changed into resources and economical benefits were brought to the company.

Experimental Research on Utilization of Steel Rolling Sludge in Sintering Process

2013 ◽  
Vol 11 (1) ◽  
pp. 283-291 ◽  
Author(s):  
Haochuan Zhao ◽  
Wenqi Zhong ◽  
Guanwen Zhou ◽  
Yingjuan Shao ◽  
Tiancai Wang ◽  
...  
Keyword(s):  
Air Pollutants ◽  
Mass Fraction ◽  
Sintering Temperature ◽  
Average Concentration ◽  
Suction Pressure ◽  
Sintering Process ◽  
Gas Temperature ◽  
Steel Rolling ◽  
Sinter Quality ◽  
Sintering Time

Abstract A quantity of steel rolling sludge (SRS) produced in the rolling mill is harm to the environment and difficult to dispose. This article is devoted to study on utilization of SRS in sintering process. A sinter pot system with capacity of 75 kg was established. The sintering time, the flue gas temperature, the sintering temperature and the suction pressure in sintering process were measured. Besides the sinter quality, air pollutants discharged from the sintering process with the mass fraction of SRS ranging from 0 to 3% was investigated. The results showed that the CO2 concentration is corresponding to the sintering process, the SO2 concentration has a self-sustaining characteristic and the NOX concentration maintains stability. Increase in mass fraction of SRS leads to the decrease of sintering temperature, particle size, tumbler index and basicity of the sinter. Besides, the sintering time and the average concentration of NOX decrease first and then increase, while the suction pressure appears an opposite trend with increasing mass fraction of SRS. Moreover, the average concentration of CO2 and SO2 both decrease with increasing mass fraction of SRS, and the fuel consumption per sinter produced is the least when the mass fraction of SRS is 2%. Therefore, when the mass fraction of SRS was 2%, the sintering process had the best performance in consideration of sinter quality, emission of air pollutants and behaviors in sintering process.

Study on Sintering Technology and Performance of Alite-Rich Cement Modified by C1.5Sr2.5A3S Mineral

2011 ◽  
Vol 306-307 ◽  
pp. 970-974
Author(s):  
Gui Qiang Li ◽  
Shou De Wang ◽  
Chao Nan Yin ◽  
Ling Chao Lu
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
Sintering Temperature ◽  
Test Method ◽  
Cement Clinker ◽  
X Ray Diffraction ◽  
Sintering Time ◽  
Orthogonal Test Method ◽  
New Type ◽  
And Performance

The effects of the sintering temperature, sintering time and contents of calcium strontium suphoaluminate (C1.5Sr2.5A3) on the sintering technology of the alite-rich cement clinker modified by C1.5Sr2.5A3were researched by the orthogonal test method. X-ray diffraction, scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and lithofacies analysis were used to investigate the compositions and structure of cement. The experimental results show that the optimal sintering temperature and sintering time of alite-rich cement clinker modified by C1.5Sr2.5A3are 1350 °C and 60 min, and the appropriate content of C1.5Sr2.5A3in the clinker is 2%. The introduction of C1.5Sr2.5A3in clinker can promote the formation of alite mineral at low temperature and decrease the sintering temperature of clinker by 100°C approximately. This new-type cement shows excellent mechanics properties. The compressive strength at 3d is up to 64.3MPa, which is increased by 26.7% comparing to that of alite-rich cement and the compressive strength at 28d is almost the same as that of alite-rich cement. For alite-rich cement clinker modified by C1.5Sr2.5A3calcinated at low temperature, alite still can be mass-formed, but the size decreases.

The Effect of Sintering on the Properties of Powder Metallurgy (PM) F-75 Alloy

2013 ◽  
Vol 795 ◽  
pp. 573-577 ◽  
Author(s):  
Zuraidawani Che Daud ◽  
Shamsul Baharin Jamaludin
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Powder Metallurgy ◽  
Human Body ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Argon Atmosphere ◽  
Medical Implants ◽  
Sintering Time

F-75 (Co-Cr-Mo) alloy are widely used in the production of medical implants because of their excellent strength properties, hardness and also one of the biocompatible materials that very suitable in human body environment. In this research, the effect of sintering in terms of sintering temperature and sintering time has been studied by focusing on the microstructure, physical and mechanical properties of F-75 alloy. The samples were prepared by blending the starting material at 160 rpm for 30 minutes, uniaxially pressing at 500 MPa and sintering in an argon atmosphere at two sintering temperatures (1300°C and 1350°C) for four sintering times (60, 90, 120 and 150 minutes). The results show that the grains and bulk density increased with the increasing of sintering temperature and sintering times. However, opposite results were obtained for apparent porosity, hardness and compressive strength

scholarly journals Optimum Processing of Absorbable Carbon Nanofiber Reinforced Mg–Zn Composites Based on Two-Level Factorial Design

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 278
Author(s):  
Herman Tuminoh ◽  
Hendra Hermawan ◽  
Muhammad Hanif Ramlee
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Elastic Modulus ◽  
Factorial Design ◽  
Carbon Nanofiber ◽  
Mechanical Stability ◽  
Sintering Temperature ◽  
Compaction Pressure ◽  
Premature Failure ◽  
Sintering Time

To prevent a premature failure, absorbable magnesium implants must possess an adequate mechanical stability. Among many ways to improve the mechanical properties of magnesium is by particle reinforcement, such as using carbon nanofiber (CNF). This work reports an experimental design for optimum materials and processing of CNF-reinforced Mg–Zn composites based on a two-level factorial design. Four factors were analyzed: percentage of CNF, compaction pressure, sintering temperature, and sintering time, for three recorded responses: elastic modulus, hardness, and weight loss. Based on the two-level factorial design, mechanical properties and degradation resistance of the composites reach its optimum at a composition of 2 wt % CNF, 400 MPa of compaction pressure, and 500 °C of sintering temperature. The analysis of variance reveals a significant effect of all variables (p < 0.0500) except for the sintering time (p > 0.0500). The elastic modulus and hardness reach their highest values at 4685 MPa and 60 Hv, respectively. The minimum and maximum weight loss after three days of immersion in PBS are recorded at 54% and 100%, respectively. This work concludes the percentage of CNF, compaction pressure, and sintering temperature as the main factors affecting the optimum elastic modulus, hardness, and degradation resistance of CNF-reinforced Mg–Zn composites.

Experimental Study on Aerated Concrete Produced by Iron Tailings

2011 ◽  
Vol 250-253 ◽  
pp. 853-856 ◽  
Author(s):  
Yu Ze Tian
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Experimental Method ◽  
Concrete Block ◽  
National Standards ◽  
Caustic Alkali ◽  
Iron And Steel ◽  
Mix Proportion ◽  
Optimal Mix ◽  
Aerated Concrete

The non-autoclaved aerated concrete block with greater than 7.5Mpa compressive strength is produced by using iron tailings, lime, aluminum powder, caustic alkali, water, cement and gypsum in the laboratory after the experimental study on the property of iron tailings produced by Anshan Iron and Steel Group. The optimal mix proportion is finally determined by adopting orthogonal experimental method, the evaluating indicator is compressive strength. Aerated concrete block that is made from iron tailing is trial produced according to the national standards, and then its strength is determined by sample examination.

Dense Sintered Long-Term Stable Ceramics in the System CaO-P2O5-ZrO2-F

2006 ◽  
Vol 309-311 ◽  
pp. 267-270
Author(s):  
Ute Ploska ◽  
Georg Berger ◽  
Manfred Willfahrt
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Mechanical Stability ◽  
Sintering Temperature ◽  
Magnesium Acetate ◽  
Bismuth Trioxide ◽  
Sintering Time

The influence of several sinter additives (three glasses, magnesium acetate, bismuth trioxide) on the compressive strength and also on the solubility of a sintered ceramics, which is composed of 57.6Mol% CaO, 26.2Mol% P2O5, 10.4Mol% ZrO2 and 5.8Mol% CaF2 was tested. The amount of sinter additives, pre-mixing of the powders, pressure power, sintering temperature and sintering time were varied. The most dense samples were produced with the finest powders (D50 ~ 1/m) and the highest sintering temperatures (1200°C). The mechanical stability of the samples was more influenced by the particle size of the powders than by the kind of binder as well as the pressure power. The compressive strength of the sintered samples ranged between 180MPa (D50 of the powder = 2.4/m) and 530MPa (D50 of the powder < 1/m). Storing of the samples in simulated body fluid for 4 weeks at a temperature of 37°C did not influence the compressive strength significantly. The sintered ceramics can be finished, for instance by grinding or polishing.

scholarly journals Synthesis and Na+ Ion Conductivity of Stoichiometric Na3Zr2Si2PO12 by Liquid-Phase Sintering with NaPO3 Glass

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3790
Author(s):  
Yongzheng Ji ◽  
Tsuyoshi Honma ◽  
Takayuki Komatsu
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
Ion Conductivity ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Sintering Time ◽  
Lower Activation

Sodium super ionic conductor (NASICON)-type Na3Zr2Si2PO12 (NZSP) with the advantages of the high ionic conductivity, stability and safety is one of the most famous solid-state electrolytes. NZSP, however, requires the high sintering temperature about 1200 °C and long sintering time in the conventional solid-state reaction (SSR) method. In this study, the liquid-phase sintering (LPS) method was applied to synthesize NZSP with the use of NaPO3 glass with a low glass transition temperature of 292 °C. The formation of NZSP was confirmed by X-ray diffraction analyses in the samples obtained by the LPS method for the mixture of Na2ZrSi2O7, ZrO2, and NaPO3 glass. The sample sintered at 1000 °C for 10 h exhibited a higher Na+ ion conductivity of 1.81 mS/cm at 100 °C and a lower activation energy of 0.18 eV compared with the samples prepared by the SSR method. It is proposed that a new LPE method is effective for the synthesis of NZSP and the NaPO3 glass has a great contribution to the Na+ diffusion at the grain boundaries.

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