Synthesis of Sorption Materials from Low Grade Titanium Raw Materials

Abstract

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.

Titanium-containing functional materials from natural raw materials and technogenic waste

“…При получении композиционного сорбента (КТФ) изучено влияние состава и структуры ТСО (рис. 3) на механизм кристаллизации твердой фазы при взаимодействии его с фосфорной кислотой [2]. Установлено, что в гетерогенной системе TiO2-SiO2-H3PO4-H2O с ростом СH3PO4 и температуры синтеза степень химического преобразования ТСО незначительна.…”

Flotation separation of titanite concentrate from apatite-nepheline-titanite ores of anomalous zones of the Khibiny deposits

“…It is known that from the current [14,15] and stored wastes of processing apatite-nepheline ores [16], it is possible to recover titanite concentrate with 28-34 % TiO2 content applying the flotation-magnetic technology. Studies have shown that such titanite concentrate can be used to produce sorbents [17,18], tanning agents and sealants [19,20], composite electrode materials [21], and other inorganic materials that are in demand on the Russian market [22]. Titanite content in apatite-nepheline ores of the Khibiny deposits is generally low, amounting to 3-5 %.…”