Treatment of Apatite Nepheline Ore Wasteenrichment Waste

Маслова, М. В.; Герасимова, Л. Г.; Nikolaev, A. I.

doi:10.5539/mas.v9n5p81

Cited by 3 publications

(4 citation statements)

References 26 publications

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“…In the hydrochloric acid system TiO 2 -SiO 2 -CaO-HCl, calcium is highly soluble, while titanium and silicon are co-precipitated as hydrated oxides. The silicon, due to its lower solubility in comparison with titanium(IV), goes into the precipitate (silica) in the first place [ 42 ]. The titanium’s (IV) solubility in the hydrochloric acid medium depends on its concentration in the HCl system ( Figure 6 ).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Sorption Materials from Low Grade Titanium Raw Materials

2022

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In this paper, a universal technology is proposed for processing low-titanium mineral raw material—apatite-nepheline ore waste, including its treatment with sulfuric or hydrochloric acid in a two-stage mode with a sequential increase in the concentration. This technique allowed us to remove nepheline and apatite in the first stage and achieve a titanium mineral content of TiO2 of more than 30%; in the second stage, we were able to convert the titanium into its precursors—titanyl sulfate monohydrate TiOSO4·H2O and a hybrid rutile-silica composition. The key stage in the sorbent synthesis is the reaction of the precursor with a phosphoric acid solution. The preferred sequence of operations begins with the mechanical activation of the precursor, causing morphological changes in it, and subsequent treatment with phosphoric acid at different concentrations under atmospheric conditions and in an autoclave, accompanied by phase transformations. Conditions for the chemical reactions which regulated the composition and structure of the final product and, accordingly, its sorption activity were found. With the help of XFA, the phase compositions of the sorbents were identified, including the individual crystalline phase α-TiP obtained from TS or the crystalline phase αTi(HPO4)2∙H2O, which is in an amorphous silica matrix obtained from a rutile–silica composition.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Sorption Materials from Low Grade Titanium Raw Materials

2022

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“…According to the conventional technology [2,20], titanite is recovered as a concentrate from nepheline flotation tails representing a mineral composition with average contents, wt%: 41-titanite, 27-nepheline, 20-apatite, 12-aegirine. Complexity of physical and chemical separation of the minerals is driven by large process streams and low titanite recovery-10-15% [21][22][23]. Sometimes, ore layers contain areas with titanite accumulations in the form of plate and wedge-shaped crystals characterized by crystallographic individuality (Figure 2).…”

Section: Titanite In Apatite-nepheline Ore and Its Position During Thmentioning

confidence: 99%

Titanite-Containing Mineral Compositions and Their Chemical Treatment with Preparation of Functional Materials

et al. 2020

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The waste of apatite-nepheline ore processing was chosen as the material of study for the present investigation. The chemical and phase compositions have been analyzed and the route of the new technology has been developed. Treatment of the waste with diluted hydrochloric acid enables to separate apatite, nepheline, titano-magnetite minerals from titanite (CaSiTiO5). The obtained titanite concentrate contains 30–32% of titanium dioxide. Interaction of titanite with hydrochloric acid under heating and stirring conditions results in calcium leaching. The titanite decomposition is accompanied by titanium and silica oxides precipitation. The resulting solid has been used as a precursor for the synthesis of functional materials. Mechanochemical activation of the precursor provides the structural and morphological disorder of the initial particles. Thermodynamic stability of activated particles is achieved by chemisorption or roasting.

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“…The rock-forming minerals of foyaite include nepheline, microcline, orthoclase, albite, aegirine, augite, Na-Ca-and Na-amphiboles, aenigmatite, titanite, eudialyte, lamprophillite, and annite. There are a lot of studies related to titanite concentrate chemical processing [27][28][29]. Among the known technologies, sulfuric-acidic ones are the most perspective because they enable to obtain a wide spectrum of materials including titanium pigments, fillers, adhesives, tanning agents, sorbents and molecular sieves.…”

Section: Geological Settingmentioning

confidence: 99%

“…There are a lot of studies related to titanite concentrate chemical processing [27][28][29]. Among the known technologies, sulfuric-acidic ones are the most perspective because they enable to obtain a wide spectrum of materials including titanium pigments, fillers, adhesives, tanning agents, sorbents and molecular sieves.…”

Section: Introductionmentioning

confidence: 99%

Titanite Ores of the Khibiny Apatite-Nepheline-Deposits: Selective Mining, Processing and Application for Titanosilicate Synthesis

et al. 2018

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Geological setting and mineral composition of (apatite)-nepheline-titanite ore from the Khibiny massif enable selective mining of titanite ore, and its processing with sulfuric-acid method, without preliminary concentration in flotation cells. In this process flow diagram, titanite losses are reduced by an order of magnitude in comparison with a conventional flotation technology. Further, dissolution of titanite in concentrated sulfuric acid produces titanyl sulfate, which, in turn, is a precursor for titanosilicate synthesis. In particular, synthetic analogues of the ivanyukite group minerals, SIV, was synthesized with hydrothermal method from the composition based on titanyl-sulfate, and assayed as a selective cation-exchanger for Cs and Sr.

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Treatment of Apatite Nepheline Ore Wasteenrichment Waste

Cited by 3 publications

References 26 publications

Synthesis of Sorption Materials from Low Grade Titanium Raw Materials

Synthesis of Sorption Materials from Low Grade Titanium Raw Materials

Titanite-Containing Mineral Compositions and Their Chemical Treatment with Preparation of Functional Materials

Titanite Ores of the Khibiny Apatite-Nepheline-Deposits: Selective Mining, Processing and Application for Titanosilicate Synthesis

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