Reactor and a method of purifying a process solution

Abstract

The invention relates to a method and a reactor for purifying solid matter from a process solution (2) in a fluidized bed in a reactor, said process solution being fed into said reactor for A fluidized bed (4) is formed in a substantially cylindrical reaction section (3), which is the lowest section in the reactor, from which the flow moves further from the upper part of the reaction section A conically expanding calm section (5) upwards, and further to a cylindrical clarifying section (6) connected to the upper part of the calm section, said clarifying section having the same diameter as the upper part of the calm section, wherein, is fed to At least a portion of said solution (2) in said reactor (1) is circulated to said fluidized bed (3) more than once, and the amount of circulating solution is passed through a mixing member placed in said reactor ( 12) is controlled in the fluidized bed.

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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