Method for Separating Slag from Ore Pulp Using Diaphragm Filter Press

Abstract

The invention discloses a method for separating slag from ore pulp by a diaphragm type pressure filter. The method comprises the following steps: (1) conveying the ore pulp with the slag to be separated into the diaphragm type pressure filter for pressure filtration, and stopping the conveying of the ore pulp when a gap between pressure filtration plates is filled with the slag by 80%-90%; (2) conveying pulp formed by clean slag and water into the pressure filter till the gap between the pressure filtration plates is filled up with the slag, and expanding a diaphragm in a frame plate by water pressure for extrusion to reduce the content of liquid in a filter cake and separate the slag from the ore pulp. According to the method, a general pressure filter is not greatly changed, valuable components in the filter cake of the slag are conveniently recycled, the recovery rate of the slag reaches more than 90%, the energy consumption and emission can be remarkably reduced, and the yield can be increased; if the water is replaced with sulfuric acid, hydrochloric acid or an organic solvent, other valuable components in the filter cake can be also recovered.

Description

technical field [0001] The invention relates to a method for separating slag in ore pulp by using a diaphragm filter press. Background technique [0002] Hydrometallurgy is a processing and utilization method in which the ore is ground into powder and then leached. The leached pulp is generally separated from the slag by pressure filtration. Therefore, pressure filtration is very important for solid-liquid separation in the hydrometallurgy process. means. In the hydrometallurgical process, generally a larger filter press is used for hydraulic compression. After the filtration is completed, the inner diaphragm of the frame plate is hydraulically expanded to realize expansion and extrusion, so as to reduce the liquid content in the filter residue as much as possible and reduce the loss of soluble valuable components. . [0003] However, the pulp filter residue after expansion and extrusion still contains about 30% liquid, and the water-soluble valuable components (metal ions...

AI Technical Summary

Problems solved by technology

[0004] However, none of the existing press filter methods can solve this technical problem more conveniently. Although some technicians blow the filter residue dry with air after the press filter is completed, there are still 20% of the filter cake after drying with air. The above liquid, therefore, the existing pressure filter method can not meet the needs of people to separate the slag in the pulp for energy saving and emission reduction, and needs to be improved according to the characteristics of the pulp