Reduction Feature and Selection Principle of Chromium Ore for Stainless Steelmaking in a Smelting Reduction Converter

2011 ◽  
Vol 142 ◽  
pp. 161-164
Author(s):  
Yan Liu ◽  
Mao Fa Jiang ◽  
De Yong Wang
Keyword(s):  
Chemical Properties ◽  
Reducing Power ◽  
Reducing Agent ◽  
Chemical Compositions ◽  
Smelting Reduction ◽  
Selection Principle ◽  
Chromium Ore ◽  
Physical And Chemical ◽  
Reducing Properties ◽  
And Chemical Properties

This paper starts with the mineral structure, reducing properties of chromium ore and the physical and chemical properties of chromium oxide and discusses the requirements of the chemical composition of chromite and confirms the selection principle of chromium ore and reducing agent of chromium ore smelting reduction. The chemical compositions of the available chromite request the relatively high contents of chromium and iron, the lower contents of Al2O3, MgO and P in gangue and the lower Cr/Fe ratio in keeping with the case of high chromium. Chromoium ore in South Africa is considered to be suitable for smelting stainless steel crude melts in a smelting reduction converter. From the reducing power and economy angle, carbon as a reducing agent is more suited to reducing chromium ore.

The Extraction of Main Chemical Compositions in Rumex Root

2011 ◽  
Vol 382 ◽  
pp. 372-374
Author(s):  
Yong Jiang ◽  
Zhi Bin Jiang ◽  
Guo Jie Shao ◽  
Dong Cheng Guo ◽  
Yu Tian ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Chemical Properties ◽  
Ethanol Extract ◽  
Chemical Compositions ◽  
Physical And Chemical Properties ◽  
Experimental Basis ◽  
Development And Utilization ◽  
Physical And Chemical ◽  
Root Methods ◽  
And Chemical Properties

Purpose: The purpose of this study was to study the compositions of the polygonaceae medicinal plants called rumex root. Methods: Solvent method and chromatography was used to purificate the chemical compositions of Rumex, and the molecular structure of the compound was identified by physical and chemical properties and spectral data. Results: Two compounds were obtained from the ethanol extract of rumex root, which were identified as Chrysophanol and Physcione. Conclusions: Experimental basis was provided for the further study of the active ingredients of rumex root and the development and utilization of medical resources.

scholarly journals Investigation of Azambur Mirabilite Deposit and Lake Water to Obtain Anhydrous Sodium Sulfate

2021 ◽  
pp. 95-105
Author(s):  
Tamar Nasuashvili ◽  
◽  
Marlen Mchedlishvili ◽  
Keyword(s):  
Lake Water ◽  
Water Samples ◽  
Sodium Sulfate ◽  
Anhydrous Sodium Sulfate ◽  
Chemical Properties ◽  
Chemical Compositions ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
Natural Brine ◽  
And Chemical Properties

Under the influence of environmental conditions, the article examines the change in the physical and chemical properties of the natural brine system containing sodium sulfate, which is located in Georgia, on the territory of the municipality of Sagarejo. To this purpose in November-June 2019-2020 the full chemical compositions of natural brine were studied at one-month intervals. The following ions were studied in brine: SO4 2-, Cl- , HCO3 - , CO3 2-, Na+ , K+ , Ca2+ and Mg2+.. In water samples, conductivity was also measured. The concentrations of the studied ions in the natural brine vary with the season, in particular, all the studied ions begin to decrease in the fall, sharply decrease in the winter, increase in the spring and significantly increase in the summer.

scholarly journals Effects of physical and chemical properties on the dissolution of sea salt

2021 ◽  
Vol 4 (2) ◽  
pp. first
Author(s):  
Hoàng Dũng Nguyễn ◽  
Nguyen Huu Lan ◽  
Nguyen Thi Ngoc Huong ◽  
Pham Huu Thinh ◽  
Lai Quoc Dat
Keyword(s):  
Physical Properties ◽  
Control Sample ◽  
Chemical Properties ◽  
Sodium Content ◽  
Salt Crystallization ◽  
Chemical Compositions ◽  
Physical And Chemical Properties ◽  
Solubility Coefficient ◽  
Physical And Chemical ◽  
And Chemical Properties

Salt plays a crucial role in human health. However, excess use of NaCl in food products can be harmful to health. One suggestion for this problem is optimization salt dissolution to increase the content of salt ions in the mouth. For this purpose, it is important to understand the solubility properties of salt crystals in saliva. The dissolving process is not only affected by the physical properties but also by the chemical composition of the salt. This study compared the solubility of four commercial grain salts in four regions in Vietnam (Bac Lieu, Thanh Hoa, Sa Huynh, Vung Tau), one flower salt in Sa Huynh and a control sample with two particle sizes 1 - 2 mm and 2 - 3 mm in a Saliva Artificial Gal – Fovet solution (SAGF). Dissolution was determined by analyzing microscopic images taken by the time and analysis by Bayesian and Partial Least Squared methods. The research evaluated the influence of physical properties (area, Feret's diameter, circularity, aspect ratio and solidity) and chemical compositions (sodium, potassium, magnesium, calcium and moisture content) on the dissolving process. Salt samples showed significant differences in physical and chemical properties by region. Morphological parameters are affected by conditions of salt crystallization that indicated through region of origin. Dissolution is evaluated through solubility coefficient, Sa Huynh flower salt and control salt have the highest solubility coefficient, simultaneously, it is also the smallest value of roundness and surface index. The projected area, magnesium and sodium content are the factors which strongly affecting on dissolution of salt samples. These results demonstrated the possibility to exploit these factors to adjust the solubility of salt as well as the perceived salinity over time.

Study on Physical and Chemical Properties of Fly Ash from Different Area in Malaysia

2013 ◽  
Vol 594-595 ◽  
pp. 985-989 ◽  
Author(s):  
I. Khairul Nizar ◽  
Abdullah Mohd Mustafa Al Bakri ◽  
A.R. Rafiza ◽  
Hussin Kamarudin ◽  
Alida Abdullah ◽  
...  
Keyword(s):  
Fly Ash ◽  
Amorphous Material ◽  
Chemical Properties ◽  
Spherical Particles ◽  
Chemical Compositions ◽  
Physical And Chemical Properties ◽  
Environmental Friendly ◽  
Physical And Chemical ◽  
Different Sources ◽  
And Chemical Properties

Fly ash is residue from the combustion of coal which widely available in worldwide and lead to waste management proposal. Moreover, the use of fly ash is more environmental friendly and save cost compared to OPC. Fly ash mostly consists of silicon dioxide (SiO2), aluminium oxide (Al2O3) and iron oxide (Fe2O3). The chemical compositions of the sample have been examined according to ASTM C618. Different sources of fly ash may result in different chemical composition. The fly ash is mainly an amorphous material with the presents of crystalline phase of quartz and mullite. Fly ash consists of mostly glassy, hollow and spherical particles.

Recent developments in the field of barrier and permeability properties of segmented polyurethane elastomers

2019 ◽  
Vol 35 (4) ◽  
pp. 445-474 ◽  
Author(s):  
Aracelys Marcano ◽  
Kateryna Fatyeyeva ◽  
Malys Koun ◽  
Pascal Dubuis ◽  
Marc Grimme ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Barrier Properties ◽  
Chemical Compositions ◽  
Practical Application ◽  
Segmented Polyurethane ◽  
Polyurethane Elastomers ◽  
Segmented Copolymers ◽  
Recent Developments ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Polyurethane (PU) elastomers represent an important class of segmented copolymers. Thanks to many available chemical compositions, a rather broad range of chemical, physical, and biocompatible properties of PU can be obtained. These polymers are often characterized by high tensile and tear strength, elongation, fatigue life, and wear resistance. However, their relatively high permeability towards gases and water as well as their biocompatibility still limits the PU’s practical application, especially for biomedical use, for example, in implants and medical devices. In this review, the barrier and permeability properties of segmented PUs related to their chemical structure and physical and chemical properties have been discussed, including the latest developments and different approaches to improve the PU barrier properties.

The Research on the Physical and Chemical Properties of Eggplant Stalk Fiber for the Complex Utilization of Stalk

2014 ◽  
Vol 881-883 ◽  
pp. 1161-1164
Author(s):  
Li Xia Li ◽  
Hai Tao Chen
Keyword(s):  
Lignin Content ◽  
Chemical Properties ◽  
Test Method ◽  
Chemical Compositions ◽  
Cellulose Content ◽  
Physical And Chemical Properties ◽  
Length Width ◽  
Complex Utilization ◽  
Physical And Chemical ◽  
And Chemical Properties

The physical and chemical properties of stalk fiber extracted by different method was important for the characters of the product. And the research laid the foundation for the complex utilization of eggplant stalk.Morphology of eggplant stalk fiber was determined by Feica microscope, the length, width and length to wide ratio were analyzed by SPSS 17.0. Chemical compositions different analysisof eggplant stalk fiber extracted by mechanical process were analyzed by applying Block test method with Design-expert 6.0.10.The result present that length, width, and length to wide ratio of stalk fiber were 11 mm,1338 um,20,respectively. Cellulose content of eggplant stalk was 34.31 %, hemi-cellulose content was 11.03%, lignin content was10.69 %.Cellulose content of eggplant stalk fiber was 36.2 %, hemi-cellulose content was18.55 %,lignin content was 17.49%.Hemi-cellulose increased by 7.52 %, cellulose increased by1.89 %, lignin increased by 6.8 %.The composition of fiber had significant difference.Beating degree was positively correlated with the beating time, beating time and wet weight were a negative correlation. Strength of stalk fiber was positively with the gramme, and strength was8.3N when gramme was 60 g/m2.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

Response of corn (Zea mays L.) to various organic-based fertilizers in marginal upland of Sta. Rita, Samar

2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno
Keyword(s):  
Block Design ◽  
Management Strategies ◽  
Chemical Properties ◽  
Organic Fertilizers ◽  
Growth And Yield ◽  
Physical And Chemical Properties ◽  
Total N ◽  
Randomized Complete Block Design ◽  
Physical And Chemical ◽  
And Chemical Properties

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.

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