Reactor and a method of purifying a process solution

Abstract

The invention relates to a method and a reactor for purifying solid matter from the process solution (2) in the fluidized bed in the reactor, into which the process solution is fed to form the fluidized bed (4) in the essentially cylindrical reaction part (3) that is the lowermost part in the reactor, from which bed the flow further moves to the calming part (5) that expands conically upwards from the upper part of the reactor part and, further, to the cylindrical clarification part (6) that is connected to the upper part of the same, the diameter of the clarification part being the same as the upper part of the calming part, whereby at least part of the solution (2) that is fed into the reactor (1) is circulated to the fluidized bed (3) more than once, and that the amount of circulating solution is controlled in the fluidized bed by means of the mixing member (12) placed in the reactor.

Description

technical field [0001] The present invention relates to a device and a method as defined in independent claims 1 and 11 for purifying process solutions. Background technique [0002] Typically, stirred reactors are cylindrical and they have standard diameters. Typically, they are provided with flow resistances, which are attached to the walls of the reactor and whose purpose is to eliminate central turbulence, which is considered harmful and absorbs gas from the surface. Solid-solution processes generally require mixing in which strong turbulence and extensive circulation occur. An important process is the removal of cadmium, eg by displacement. Cadmium is one of the harmful substances in the electrolysis process of zinc. [0003] The feeding into the stirred reactor takes place primarily by feeding solid matter and solutions into the reaction space from above. Generally, in a continuous reactor, it is desirable for solid matter and solution to escape at approximately th...

AI Technical Summary

Problems solved by technology

However, as the reaction proceeds, the particle size of the solid material in the bed decreases, whereby the amount of solid material drifting with the solution increases

[0006] The disadvantage faced by current reactors is that in each reactor the flow passes through the fluidized bed once

This significantly affects the purification of the solution and the number of circulation stages

Furthermore, current fluidized bed reactors are not regulated, but their properties are determined according to the supply and particle size of the process stream

Naturally, this causes problems when these quantities vary according to the state of the process

In addition, the reactor is batch type, and it is not easy to consider the flexibility caused by capacity

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