UA5964U - An apparatus for the preparation of metal tin in untinning heavy nonferrous metals SCRAP - Google Patents

Abstract

An apparatus for the preparation of metal tin in untinning heavy nonferrous metals scrap contains perforated baskets for loading the raw material fixed to the mechanism of displacement thereof, untinning bath, electrolysis bath with electrodes and power supply, pumps for repumping solutions and intermediary capacity. The intermediary capacity is joined by couple of pipelines with untinning bath, and by another couple of pipelines – with electrolysis bath.

Description

The proposed useful model refers to the field of metallurgy, namely to the production of metals, including heavy non-ferrous metals, and in particular refers to a device for obtaining metallic tin by de-tinning their scrap, for example, scrap copper and copper alloys.

From the state of the art (Kupryakov Y.P. Proizvodstvo tyazhel'ikh tsvetnyih metallov iz loma y otkhodov, - Kharkiv: "Osnova", 1992) a device that realizes the method of de-tinning of scrap non-ferrous metals is known. The specified device consists of perforated baskets for loading raw materials, attached to mechanization, a desalination bath, an electrolysis bath with electrodes and a power source, pumps for pumping solutions.

The disadvantages of this device include significant energy and time costs in the initial stage of the process, associated with the need to heat the entire mass of raw materials that have arrived for processing to the temperature necessary for effective tin dissolution. In addition, during the operation of the device, there is a significant fluctuation in the content of tin in the desalination solution (electrolyte). At the same time, the concentration of the metal increases sharply in the initial period of the tinning process and gradually decreases as it fades. Such changes in the concentration of tin in the demineralizing solution (electrolyte) lead to a violation of the process of electrolytic release of tin, lead to a decrease in the value of the current yield indicator and cause an increase in electricity consumption.

The task of the proposed useful model is to create a device for obtaining metallic tin in the process of scrap metal removal of heavy non-ferrous metals with increased efficiency of tin extraction, provided that energy and time costs are reduced.

The task is solved by creating a device for obtaining metallic tin during the desalination of heavy non-ferrous metal scrap, containing perforated baskets for loading raw materials, attached to mechanization, a desalination bath, an electrolysis bath with electrodes and a power source, and pumps for pumping solutions.

At the same time, according to the utility model, the proposed device contains an intermediate container connected by a pair of pipelines with a desalination bath and another pair of pipelines with an electrolysis bath.

At the same time, according to the useful model, the volume of the intermediate tank is 3-5 times greater than the volume of the de-tinning bath.

At the same time, according to the utility model, the device contains a washing bath connected to an intermediate container by a pipeline.

A useful model is illustrated by the figure (Fig.), which depicts the proposed device, consisting of: perforated baskets with processed raw materials 1, desalination bath 2, intermediate container C, electrolysis bath 4, washing bath 5, transfer device 6.

The proposed device works as follows. Scrap metal with tin and solder is loaded into the perforated basket 1, and with the help of the transfer device 6, it is placed in the desalination bath 2.

In the intermediate container C, which is heated, for example, with the help of steam, prepare a desalination solution, for example, with the following quantitative composition (when the tin content in the electrolyte is 15-20 g/l): alkali (40 g/l), caustic soda (50 g/l l), methanenitrobenzoic acid (MNBA) (15g/l). The de-tinning solution, heated in an intermediate container to a temperature of 90-96" with the help of a pump (not shown in the figure), enters the de-tinning bath. The solution completely penetrates the scrap layer in the perforated basket, washing all its surfaces. The tin from the scrap surfaces, due to dissolution, passes to the solution, forming an electrolyte. The duration of the process, depending on the thickness of the copper coating, can reach 12 or more hours. At the same time, the detin solution, which after saturation with tin is also the electrolyte, flows from the detin bath by gravity to the intermediate tank, from which, with the help of of the pump (not shown in the figure) enters the electrolysis bath 4. From the electrolysis bath, the de-tinning solution (electrolyte) returns to the intermediate tank by gravity.

The volume of the intermediate tank is 3-5 times greater than the volume of the desalination bath, which allows, in order to stabilize the electrolysis process, to maintain a constant concentration of tin in the desalination solution (electrolyte), as well as the necessary concentrations of the components of the desalination solution.

Stabilization of the tin content in the demineralizing solution (electrolyte) leads to a 5-79% reduction in electricity consumption per ton of mined tin.

A direct current is supplied to the electrodes placed in the electrolysis bath (not shown in the figure) from a current source (not shown in the figure) and maintains the cathodic current density, for example, at the level of 250A/m?.

Electrolysis is carried out with an insoluble anode. For example, steel plates with an area of 1 m are used as cathodes.

After the deposition of tin on the cathodes, they are removed from the electrolysis bath, dried, and the tin is remelted from the surfaces in a resistance slot furnace.

The tin obtained after smelting the cathodes is filtered and poured into the smelter. The cathodes are returned to the electrolysis bath for further use in the tin deposition process. From the electrolysis bath, the tin-depleted de-tin solution (electrolytes) is returned through an intermediate container to the de-tin bath.

At the end of the tinning process, which is controlled visually by the condition of the samples taken from the tinning bath, the perforated basket with tinned raw materials is moved to the washing bath with the help of a transfer device. After washing the raw materials, part of the washing water containing a certain amount of desalination solution (electrolyte) is sent to the intermediate tank to replenish the losses caused by evaporation during the desalination process, and the other part is sent to the water treatment stage.

At the end of washing, the perforated basket is removed from the de-tinning bath, and after settling on a pallet, the de-tinned scrap is sent to the stage of obtaining metals or alloys according to known technology, for example, to fire refining to obtain M2 grade copper.

Maintaining a constant composition of the desalination solution is carried out by adding the necessary components to the storage tank, based on periodic analysis of the composition of the desalination solution (electrolyte).

At the same time, simultaneously with the transportation of the perforated basket with de-tinned raw materials to the washing bath, the scrap with tin dross and solder is loaded into the next perforated basket, which is placed in the de-tin bath with the help of a moving device.

The proposed device was successfully tested at the enterprises of the corporation "UKRPIDSHYPNYK", in particular at

OJSC "Artemivsk non-ferrous metal processing plant".

cathodes with tinned tin scrap tinned scrap for processing for processing washing water water for cleaning 4 pairs

Fig.

Claims (3)

1. A device for obtaining metallic tin during the desalination of heavy non-ferrous metal scrap, containing perforated baskets for loading raw materials, attached to the device for their movement, a desalination bath, an electrolysis bath with electrodes and a power source, pumps for pumping solutions, which is distinguished by the fact that it contains an intermediate container connected by a pair of pipelines to the desalination bath, and by another pair of pipelines to the electrolysis bath. 2. The device according to item I, which is characterized by the fact that the volume of the intermediate container is 3-5 times greater than the volume of the desalination bath. 3. The device according to claims 1, 2, which is characterized by the fact that it contains a washing bath connected to an intermediate container by a pipeline.