scholarly journals Silica removal from waste of ilmenite concentrate pyrometallurgical processing

2021 ◽  
Author(s):  
А. Ultarakova ◽  
◽  
N. Lokhova ◽  
A. Yessengaziyev ◽  
◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Phase Analysis ◽  
Sodium Hydroxide Solution ◽  
Amorphous State ◽  
Chemical Properties ◽  
Dust Sample ◽  
X Ray ◽  
Ilmenite Concentrate ◽  
Study Results ◽  
Electric Smelting

The article presents the study results for alkaline leaching of fine ilmenite concentrate dusts from electric smelting. The physical and chemical properties of the dusts were studied using chemical and instrumental analysis methods. The dust composition was determined, X-ray phase analysis showed that the dust sample substance is in the X-ray amorphous state, iron is present in the trivalent state, and silicon is bound to magnesium. The dust sample study using a scanning electron microscope showed that part of the titanium is bound in a hard-to-disclose anasovite encapsulated in amorphous silicon oxide. The leaching study of electric smelting dust with sodium hydroxide solutions included the study of the effect of sodium hydroxide concentration, process duration, temperature, S: L ratio. The optimal conditions for dust leaching from electric smelting of ilmenite concentrate have been established: temperature 80-90 °C, duration 90-120 min, ratio S: L = 1: 5, the concentration of sodium hydroxide solution 110-115 g/dm3. The silicon extraction degree into the solution under these conditions was 77.7%. The behavior of accompanying components of chromium, zinc, iron, and manganese during dust leaching was also studied. X-ray phase analysis of the cake after leaching shows almost complete amorphization of the leached product, the main phase is a solid solution of Fe2O3·TiO2.

scholarly journals Alkali Activated Paste and Concrete Based on of Biomass Bottom Ash with Phosphogypsum

2020 ◽  
Vol 10 (15) ◽  
pp. 5190
Author(s):  
Danutė Vaičiukynienė ◽  
Dalia Nizevičienė ◽  
Aras Kantautas ◽  
Vytautas Bocullo ◽  
Andrius Kielė
Keyword(s):  
Compressive Strength ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Bottom Ash ◽  
Control Sample ◽  
Test Methods ◽  
X Ray ◽  
Hydroxide Solution ◽  
Fine Grained ◽  
Alkali Activated

There is a growing interest in the development of new cementitious binders for building construction activities. In this study, biomass bottom ash (BBA) was used as aluminosilicate precursor and phosphogypsum (PG) was used as a calcium source. The mixtures of BBA and PG were activated with the sodium hydroxide solution or the mixture of sodium hydroxide solution and sodium silicate hydrate solution. Alkali activated binders were investigated using X-ray powder diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM) test methods. The compressive strength of hardened paste and fine-grained concrete was also evaluated. After 28 days, the highest compressive strength reached 30.0 MPa—when the BBA was substituted with 15% PG and activated with NaOH solution—which is 14 MPa more than control sample. In addition, BBA fine-grained concrete samples based on BBA with 15% PG substitute activated with NaOH/Na2SiO3 solution showed higher compressive strength compered to when NaOH activator was used −15.4 MPa and 12.9 MPa respectfully. The NaOH/Na2SiO3 activator solution resulted reduced open porosity, so potentially the fine-grained concrete resistance to freeze and thaw increased.

Study of Mechanical Activation Processes of Mica Bearing Rocks

2014 ◽  
Vol 1040 ◽  
pp. 367-371 ◽  
Author(s):  
Valeriy M. Pogrebenkov ◽  
Kirill S. Kostikov ◽  
Yu.P. Azhel ◽  
K.S. Kamyshnaya
Keyword(s):  
Mechanical Activation ◽  
Phase Analysis ◽  
Mechanical Treatment ◽  
Time Intervals ◽  
Treatment Methods ◽  
X Ray ◽  
Study Results ◽  
Muscovite Mica

The study results of mica bearing rocks from the Mamskoye and Kuletskoye deposits and the processes, involved in grinding and activating muscovite mica from the rocks using a ball and a planetary mills, a disintegrator and a pneumoimpulsive installation depending on different time intervals and other grinding factors, are presented in this paper. The resultant materials were examined by the methods of X-ray phase analysis, derivatography, microscopy and others, which resulted in drawing the conclusions concerning the applicability of different mechanical treatment methods applied in obtaining ground mica for various uses.

scholarly journals Study of physical and chemical properties of tellurium-containing middlings

2020 ◽  
Vol 4 (315) ◽  
pp. 49-56
Author(s):  
A. V. Nitsenko ◽  
◽  
N. M. Burabaeva ◽  
F. Kh. Tuleutay ◽  
R. S. Seisembaev ◽  
...  
Keyword(s):  
Electron Probe ◽  
Amorphous State ◽  
Chemical Properties ◽  
Anode Slime ◽  
Physical And Chemical Properties ◽  
X Ray ◽  
Probe Microscopy ◽  
Copper Anode Slime ◽  
Physical And Chemical ◽  
And Chemical Properties

The process experts are concerned in tellurium due to its various physical and chemical properties. The copper anode slime is the main industrial source of tellurium, after processing of that tellurium becomes marketable product and can be sold both in elemental form and tellurium-containing middling. Physical and chemical properties of the tellurium-containing middling of Kazakhmys Smelting LLP produced in 2018 have been studied in this paper. The following methods have been applied during the study: particle size distribution, X-ray phase, X-ray fluorescence and scanning electron probe microscopy. It was found that material is mainly represented by the large pieces of 0.2 mm in size, with moisture content of 15.57 %, bulk density of 0.8 g/cm3 without tapping and 0.88 g/cm3 with tapping, the angle friction - 33°. The elemental composition of the material was determined by X-ray fluorescence method as follows, wt. %: Cu – 33.327; Te – 21.863; Se – 0.766, O – 35.116; S – 5.045. X-ray phase analysis showed that material is mainly in the amorphous state, the following phases had been identified: Cu2.5SO4(OH)3·2H2O, Cu3(SO4)(OH)4, CuSO4(H2O)3. Tellurium-containing phases could not be detected due to strong amorphism. Hydrosulfate forms of copper in the form of flakes have been found on the surface of the middlings by electron probe microscopy. EDS analysis of individual areas showed that patina also contains small amounts of chlorine, selenium and up to 25 % tellurium, in addition to such elements as copper, sulfur and oxygen. Small amounts of sulfur, chromium, selenium and up to 45 % of oxygen has been found in the open area of material, that is specific for its oxidation.

scholarly journals Swelling of Natural Soil Subjected to Acidic and Alkaline Contamination

2017 ◽  
Author(s):  
Hariprasad Reddy Ponnapureddy ◽  
Rama Vara Prasad Chavali ◽  
Rakesh J Pillai
Keyword(s):  
Electron Microscopy ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Expansive Soil ◽  
Natural Soil ◽  
Acid Solutions ◽  
One Dimensional ◽  
X Ray ◽  
Free Swell ◽  
Scanning Electron

This paper aims at establishing the influence of acidic and alkalinepore fluids on the swell behaviour of an expansive soil. Aseries of laboratory one dimensional free swell tests were performedto study the behaviour of soil in acidic and alkaline environment.Three different concentrations of sodium hydroxide andsulphuric acid solutions were used as pore fluids to understandthe influence of variable concentrations on the swell behaviourof soil. Results showed that, the swelling of soil that interactedwith sodium hydroxide solution initially increased at lower concentrationand then decreased with increase in concentration.In contrast, the swelling initially decreased at lower concentrationof sulphuric acid and then increased with increase inconcentration of solution. The complexity in the swell behaviourof contaminated soil was assessed by thoroughly investigatingthe mineralogy and microstructure alterations by carrying outX-ray diffraction analysis, Scanning electron microscopy andEnergy dispersive analysis of X-ray at the end of interaction.

scholarly journals Compressive Strength of Geopolymer Based on the Fly Ash Variation

2016 ◽  
Vol 841 ◽  
pp. 98-103 ◽  
Author(s):  
Antoni ◽  
Stephen Wibiatma Wijaya ◽  
Djwantoro Hardjito
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Power Plants ◽  
Sodium Hydroxide Solution ◽  
Chemical Properties ◽  
External Factors ◽  
Internal Factors ◽  
Internal And External Factors ◽  
Physical And Chemical

. This study was conducted to determine the factors that may affect the compressive strength of fly ash-based geopolyme, manufactured using fly ash obtained from different power plants. Fly ash obtained from different sources may have very different characteristics that affect the properties of geopolymer product. The source of variations in the geopolymer properties from the view point of the source materials can be classified into internal and external factors. Internal factors include the physical and chemical properties of the fly ash, while external factors associated with mixture proportion of geopolymer and the manufacturing process. From the experimental results, it was found that the size of the fly ash granules, the CaO and MgO content, and the carbon content in fly ash are the internal factors that may affect the compressive strength of geopolymer. On the other hand, the ratio of sodium silicate to sodium hydroxide in the alkaline solution and the molarity of the sodium hydroxide solution are the external factors influencing the compressive strength of geopolymer.

The Effect of Strong Alkali Treatment on the Cell-Wall Structure of Ramie Fiber

1977 ◽  
Vol 47 (6) ◽  
pp. 437-440 ◽  
Author(s):  
P. K. Ray ◽  
B. K. Das
Keyword(s):  
Cell Wall ◽  
Sodium Hydroxide ◽  
Room Temperature ◽  
Sodium Hydroxide Solution ◽  
Alkali Treatment ◽  
Wall Structure ◽  
Ramie Fiber ◽  
Cellulose Ii ◽  
X Ray ◽  
Sodium Hydroxide Treatment

Transverse sections of degummed ramie fiber, after treatment with 24% w/w sodium hydroxide solution at room temperature and the boiling condition, have been examined by light microscopy. The peripheral S1 layer of the secondary wall is not distinctly visible in most of the transverse sections of the fibers after sodium hydroxide treatment at boil. X-ray diagrams of the fibers showed that the conversion to cellulose II was complete in both the conditions of treatment. The microfibrillar orientation and mechanical properties of the fibers were in harmony with the change in the structure of the cell wall.

X-RAY INVESTIGATION OF METAL REDUCTION BY MECHANICAL ALLOYING AND SOLID STATE REACTION

1991 ◽  
Vol 05 (20) ◽  
pp. 1355-1359 ◽  
Author(s):  
N. G. DANIELIAN ◽  
S. K. JANAZIAN ◽  
V. V. MELNICHENKO
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Phase Analysis ◽  
Solid State Reaction ◽  
Amorphous State ◽  
Reduction Reaction ◽  
Metal Reduction ◽  
X Ray ◽  
State Of Metals

X-ray phase analysis was used for studying the reduction reaction of some metals by mechanicals alloying (MA) and solid state reaction. It is shown that it is possible to obtain both amorphous (Mo, W) and crystalline (Pb) metals as a result of such processes. An assumption is set forth that the amorphous state of metals is stabilized at the expense of the various impurities contained in them.

X-Ray Analysis of the Swelling of Wood Pulp in Sodium Hydroxide Solution

Nature ◽  
1950 ◽  
Vol 166 (4212) ◽  
pp. 148-148 ◽  
Author(s):  
LEIF JÖRGENSEN ◽  
EDGAR RIBI
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Wood Pulp ◽  
X Ray ◽  
Hydroxide Solution
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