Investigations of Waste Sludge of Titanium Production  and Its Leaching by Nitric Acid

Ultarakova, Almagul

doi:10.5593/sgem2019/1.3/s04.111

Cited by 4 publications

(3 citation statements)

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“…In recent decades, significant research efforts have been dedicated to developing materials for medical applications, especially for dental and orthopedic implants [1][2][3]. Titanium and its alloys are ideal for these purposes due to their outstanding properties, including their high strength, low density, excellent corrosion resistance, and superior biocompatibility [4][5][6][7][8]. However, for implants to effectively interact with the physiological environment of the body, their surfaces must exhibit osteoconductive and osseointegrative properties [9,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Current Duty Cycle and Voltage of Micro-Arc Oxidation on the Microstructure and Composition of Calcium Phosphate Coating

Mamaeva,

Kenzhegulov,

Panichkin

et al. 2024

Coatings

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The micro-arc oxidation (MAO) technique was employed to produce calcium phosphate coatings on titanium surfaces using an electrolyte composed of hydroxyapatite and calcium carbonate in an aqueous solution of orthophosphoric acid. The coatings’ morphology and composition were regulated by adjusting electrical parameters, specifically the duty cycle and voltage. This study examined the effects of the duty cycle and voltage during the MAO process on the microstructure and composition of calcium phosphate coatings on VT1–0 titanium substrates. Scanning electron microscopy (SEM) was utilized to analyze the microstructure and thickness of the coatings, while X-ray diffraction (XRD) was employed to determine their phase composition. The findings reveal that the surface morphology of the calcium phosphate coatings transitions from a porous, sponge-like structure to flower-like formations as the duty cycle and voltage increase. A linear increase in the voltage within the applied duty cycles led to a rise in the size of the forming particles of amorphous/crystalline structures containing phases of monetite (CaPO3(OH)), monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O), and calcium pyrophosphate (γ–Ca2P2O7).

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Section: Introductionmentioning

confidence: 99%

Influence of Current Duty Cycle and Voltage of Micro-Arc Oxidation on the Microstructure and Composition of Calcium Phosphate Coating

Mamaeva,

Kenzhegulov,

Panichkin

et al. 2024

Coatings

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“…Some machine components and structures are constantly subject to mechanical and chemical degradation due to wear and corrosion processes. Hard protective coatings greatly contribute to the wear and corrosion resistance of metals/metal alloys [1][2][3][4][5]. The use of hard protective coatings such as TiC [6], TiN [7], TiCN [8], TiAlN [9], TiSiC [10], Al 2 O 3 [11], ZrTiCN [12], diamond-like films [13,14], and others is a suitable way to protect machine parts or tools from the harmful effects of the environment and wear.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Tribological and Corrosion Characteristics of TiCN, TiCrCN, and TiZrCN Coatings

et al. 2022

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Coatings based on titanium carbonitride alloyed with zirconium and chromium were deposited using the method of reactive magnetron sputtering on the surface of titanium VT1–0. The effect of alloying titanium carbonitride with zirconium and chromium on the tribo- and corrosion properties of the coating has been studied. Coatings with different compositions were formed by changing the ratio of alloying elements to titanium in a single target. To study the obtained coatings, a scanning electron microscopy, nanoindentation, sliding wear test (ball on disk method), and corrosion tests in 0.5 M Na2SO4 and 30% NaCl solution were used. As a result of wear and corrosion tests, friction coefficients, mass index, and corrosion rate of alloyed and pure titanium carbonitride coatings were obtained. The average coefficient of friction of the coatings varied in the range of 0.17–0.31. The values of nanohardness are determined depending on the composition of the coatings. From corrosion data, it is determined that TiCrCN and TiZrCN coatings exhibit better corrosion properties compared to TiCN coatings. As a result of the dependences obtained, the preferred composition of the coating, the most resistant to wear and corrosion damage, was revealed.

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“…At the same time, UKTMP JSC procures carnallite that is a reagent consisting of a mixture of magnesium and potassium chlorides, abroad at fairly high prices. Meanwhile, the problem of carnallite deficiency can be reduced by obtaining it by regeneration of valuable components from titanum-magnesium production wastes [6,7].…”

Section: Introductionmentioning

confidence: 99%

Studies on Valued Components Extraction from Titanium-Magnesium Production Wastes

Almagul¹,

Shah²,

Baltabekova³

2020

ARFMTS

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Based on the results of studies on the extraction of rare-earth elements from exhausted molten titanium chlorinators and the production of carnallite from chloride waste from titanium-magnesium production, the possibility to obtain REE production solution suitable for their separation and synthetic carnallite intended for chlorination of titanium slags is demonstrated. A purified water leaching solution from the exhausted molten titanium chlorinator (EMTC) was obtained to isolate synthetic carnallite with the addition of hydrochloric acid and magnesium electrolysis cell sludge up to pH 6.8-7.6. Physicochemical analysis of EMTC showed that the composition contains rare-earth elements in the form of oxides and water-soluble chlorides. The optimal EMTC water leaching mode was established: S:L ratio = 1:0.7, temperature 20-25 °С, duration-60 min. In this case, a solution was obtained with a concentration of 0.532 g/dm 3 of the sum of rare-earth elements, 122.8 g/dm 3 of iron, pH 0.76. The separation of iron from a chloride solution during precipitation with a solution of potassium hydroxide in the range of pH 2.6-3.1 at a temperature of 80 °C. The precipitation of REEs from the solution with oxalic acid in an amount of 150% of the amount required stoichiometrically in the form of oxalates with a pulp exposure time of oxalates of 4 hours. The precipitate formed from oxalates was washed on the filter with a 2% oxalic acid solution at S:L = 1:8. Obtaining a collective REE concentrate in the processing of exhausted molten titanium chlorinators. The throughout recovery of rare-earth elements from EMTC into collective concentrate was 66%.

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Investigations of Waste Sludge of Titanium Production and Its Leaching by Nitric Acid

Cited by 4 publications

References 0 publications

Influence of Current Duty Cycle and Voltage of Micro-Arc Oxidation on the Microstructure and Composition of Calcium Phosphate Coating

Influence of Current Duty Cycle and Voltage of Micro-Arc Oxidation on the Microstructure and Composition of Calcium Phosphate Coating

Comparative Study of Tribological and Corrosion Characteristics of TiCN, TiCrCN, and TiZrCN Coatings

Studies on Valued Components Extraction from Titanium-Magnesium Production Wastes

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