CZ9102004A3 - Continuous removal device - Google Patents

Abstract

The device consists of a fluid reactor (1) equipped with a filling (11), which consists of metal particles with an electrochemical potential lower than the electrochemical potential of the metal to be removed, a separator (2) of the particulate form of the metal to be removed and a dispenser (3) of the particulate form of the metal to be removed. The components of the device are connected to each other by a circulation pipe (4).

Description

Device for continuously removing metals from solutions

Qbód technikv

The invention relates to an apparatus for the continuous removal of dissolved forms of metals from solutions, which is suitable, in particular, as part of a process line for the purification of waste sciences containing these forms of metals.

Brushing state of the art

Dissolved forms of metals are currently removed from the solutions in which they are present;

- precipitation to form insoluble hydroxides,

- precipitation using inorganic sulphides or organosulphates to form insoluble metal sulphides or complexes thereof,

- electrochemical methods using different types of electrolysers,

- removal of these metals by substitution with another metal, the process being carried out under static conditions on large spider metal materials,

The latter methods also include electrochemical cementation, in which solutions containing metal, for example waste water, are contacted with an electrochemical potential lower than the electrochemical potential of the metals in solution. The process takes place in filled tanks, in which the purified water flows into the metal layer with a lower electrochemical potential, forming the filler. In the removal of metals from the waste water in this way, the efficiency of the metal removal is initially very good but then decreases. the surface of the metal filler with lower electrochemical potential prevents further exchange.

SUMMARY OF THE INVENTION

The start-up of soluble forms of metals from the solutions can be carried out continuously, using a process of electrochemical cementation taking place in a fluidized bed of metal with a lower electrochemical potential, on a device suitable, in particular, as part of a waste line treatment line.

It consists of a fluidized bed reactor having a charge of metal particles with an electrochemical potential lower than the electrochemical potential of the metals in solution, a particulate metal separator and a particulate metal dispenser interconnected by circulating means. pipeline.

The solution containing the dissolved metal forms is fed to a fluidized bed reactor in which in the fluidized state there are metal fill particles with an electrochemical potential lower than the electrochemical potential of the metal to be cleaned. A cementation process takes place in which the electrochemical reaction reduces the metal with a higher electrochemical potential, which is eliminated in solid form. By mutual abrasion of the particles in the fluidized bed, the precipitated metal in particulate form is separated from the surface of the fluidized filler particles. The mutual contact of the particles of both metals transfers the potential from the electronegative metal particle to the electropositive metal particles, thereby creating conditions for the reduction of the deposited metal also on the particles themselves.

Purified water flows from the fluidized bed reactor to the separator and entrains particulate metal particles which are separated in the separator from the purified water.

The fluidized bed reactors used may be any of a number of devices ensuring the desired fluidized state of the charge, for example, cylindrical, conical, wedge, pyramid-shaped, slot-shaped, perforated grate or countercurrent mushroom reactors.

The separator may be a filtration or sedimentation tank, and a dosing pump with a controlled mode of operation is suitable as a dispenser.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention is explained in more detail with reference to the drawing, in which: FIG.

DETAILED DESCRIPTION OF THE INVENTION

Example 1

The device for continuously removing dissolved metal forms from the solutions consists of a fluidized bed reactor napl filled with a charge £ of 500 grams of steel granulate, with a 20% fluidized bed expansion maintained during operation of the device. A separator 2 consisting of a sedimentation tank and a dispenser 3 of the particulate form of the precipitated metal, which is a metering pump, is connected to the fluidized bed. containing dissolved Cu at a concentration of up to 400 mg.l ¹ , the total volume of the system being 15 liters.

The purified waste water was fed to a fluidized bed reactor (6) where an electrochemical cementation process was carried out. The purified water was further discharged from the fluidized bed reactor to a separator of the 2 " up to 400 mg.l ^{-1 a} limit concentration of particulate Cu medium of 4.25 gl ^{-1 was} maintained in the fluidized bed for a Cu medium concentration below 20 mg.l ^{1 a} limiting concentration of 2.9 gl -1.

Industrial y.

The device according to the invention can be used, in particular, for the purification of wastes containing dissolved metal forms and in hydrometallurgy.

Claims (1)

PATENT CLAIMS Apparatus for continuously removing dissolved forms of metals from solutions, suitable, in particular, as part of a wastewater treatment plant containing these forms of metals, characterized in that it consists of a fluid rector (1) provided with a charge (11) consisting of metal particles with an electrochemical potential lower than is the electrochemical potential of the metal to be removed, further from the separator (2) of the particulate form of the metal to be removed and the dispenser (3) of the particulate form of the metal to be removed. connected by a circulation pipe (4).