Novel technology and device for Bayer process-based separation of iron in high-iron red mud

Abstract

The invention discloses a novel technology for Bayer process-based separation of iron in high-iron red mud. The novel technology comprises the following steps of A, carrying out sedimentation on alumina production solid waste, washing bottom-flow red mud three times, carrying out roughing separation by a vibrating screen, adding water into the red mud so that red mud solid content satisfies magnetic separation requirements, and at least carrying out a magnetic separation process to separate concentrate and mine tailing, B, carrying out concentration on the concentrate, carrying out overflow separation to remove most water, and carrying out press filtration to obtain filter cake which is iron concentrate, and C, carrying out concentration on the mine tailing, carrying out overflow separation to remove most water, carrying out press filtration to obtain filter cake and carrying out dry-type stockpiling. The invention discloses a device for Bayer process-based separation of iron in high-iron red mud. The device comprises a buffer slot, the vibrating screen, a magnet separator, a concentrate tank, a mine tailing tank, a concentration machine and a filter press. The device matches the novel technology, has a high yield and a high total iron recovery rate and utilizes a mine tailing dry-type stockpiling process. The novel technology has a simple process, is mature in operation and realizes production easily.

Description

Technical field [0001] The invention belongs to the technical field of alumina production red mud processing technology, and specifically relates to a new high-efficiency high-speed iron Bayer process red mud processing technology and device. Background technique [0002] In the production of diaspore Bayer process alumina, bauxite, lime, and circulating lye are mixed and ground into a qualified slurry and then dissolved out. Under the action of high temperature and high pressure, the alumina in the ore enters the solution, and the insoluble matter is Red mud. After the dissolution, the ore pulp is diluted and settled to separate the solid and liquid, and the underflow red mud produced is reversely washed three times, filtered, recovered and discharged with alkali. The production of 1 ton of alumina will produce 1.1~1.5 tons of red mud. With the rapid development of the alumina industry in recent years, the global annual alumina output has reached nearly 100 million tons, and th...

AI Technical Summary

Problems solved by technology

However, this process still has the characteristics of high cost, high energy consumption, complicated process, poor industrial applicability, unsatisfactory effect, and potential safety hazards.

Images