T/SACE 031-2023 Ammonium vanadate (made from vanadium-containing alkali residue with aluminum oxide)

Scope

Scope: This document specifies the process, requirements, test methods, inspection rules, and marking, packaging, transportation, storage, and quality certificate content for the preparation of ammonium vanadate (hereinafter referred to as ammonium vanadate) from vanadium-containing alkali slag extracted using an alumina solution system. This document is applicable to the preparation of ammonium vanadate using vanadium-containing alkali slag extracted from an alumina solution system as the main raw material, through processes such as dissolution and impurity removal, ammonium salt crystallization, and comprehensive treatment of tail liquids. The prepared ammonium vanadate is used in the production and processing of sheet vanadium, vanadium-nitrogen alloys, and vanadium-iron alloys, and ultimately serves as a steelmaking additive in steel products, primarily construction rebar. Main technical content: Vanadium-containing alkali slag from bauxite ore typically contains trace amounts of rare metals such as vanadium. Under the action of high-temperature alkali solution, vanadium enters the alumina solution system with aluminum and accumulates and enriches to a certain concentration in the circulating mother liquor. Through the impurity removal process, vanadium-containing alkali slag can be extracted with a V2O5 content of 10%-17%. The process uses vanadium-containing alkali slag extracted from alumina evaporation mother liquor as the main raw material, through dissolution and impurity removal, ammonium salt crystallization to prepare ammonium vanadate products, and comprehensive treatment of ammonium vanadate tail liquids to produce anhydrous sodium sulfate and recover ammonium salts as by-products.

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