Red mud leaching slag washing tank and application method thereof

Abstract

The invention discloses a red mud leaching slag washing tank and an application method thereof. A tank body is cylindrical and internally provided with a stirrer; a stirring motor is provided with a variable-frequency speed regulator; and the side surface, close to the bottom end of the tank body, of the tank body is provided with a valve control suspension outlet, a valve control leaching residueoutlet and a valve control heavy placer mineral outlet from top to bottom in sequence. After the red mud leaching reaction is completed, low-speed stirring is adopted, coarse and heavy minerals in ore pulp sink, after suspension and leaching residues (settling residues) are layered, the suspension is discharged through the suspension outlet, then washing water is added, stirring is performed fora moment, then low-speed stirring is adopted, after the leaching residues settle, residue washing water is discharged through the suspension outlet, and stirring is performed after water is added again; and the leaching residues are conveyed to the next procedure for utilization through the leaching residue outlet. The suspension produced by the method provided by the invention can be used as an efficient and environment-friendly composite water purifying agent product, and the leaching residues hardly contain silica sol and activated earth, so that valuable metals such as iron, titanium, scandium, vanadium, zirconium, tantalum and niobium are enriched by about two times in the leaching residues, and the recycling cost of the leaching residues is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment and technology, and in particular relates to a red mud leaching slag washing tank and a using method thereof. Background technique [0002] Bayer process red mud is the solid waste produced during the solid-liquid separation of bauxite after high temperature, high pressure and strong alkali to dissolve alumina. Its main components are iron, aluminum, silicon, calcium, sodium, titanium, oxygen and a small amount of scandium. , vanadium, zirconium, tantalum, niobium and other rare metals, the content of which is generally Fe 2 o 3 20-35%, Al 2 o 3 10~20%, SiO 2 8~17%, CaO 11~19%, TiO 2 4.5~7.5%, Na 2 O 3.0~4.0%, Sc 2 o 3 0.008~0.015%, V 2 o 5 0.07~0.16%, ZrO 2 0.10~0.40%, Ta 2 o 5 0.008~0.012%, Nb 2 o 5 0.020~0.040%. Red mud contains complex minerals, including hematite (α-Fe 2 o 3 ), hydrated garnet [Ca 3 AlFe(SiO 4 )(OH) 8 ], sodium silicate (Na 2 O·Al 2 o 3 1...

AI Technical Summary

Problems solved by technology

[0004] The existing technology is to adopt the method of filtering to separate the acidic pulp slag liquid, because the H in the acidic pulp 4 SiO 4 (Silica sol) is easy to condense into silica gel, making it difficult to filter, and most of the active ingredients of the water purifier are H 4 SiO 4 (Silica sol) and all the active soil into the filter residue not only cause loss, but also not conducive to the recovery of valuable metals such as iron, aluminum, titanium, scandium, zirconium, vanadium, tantalum, niobium and rare earth from the filter residue

Images