JPS58174533A - Continuous refinement of impure copper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a process for continuously refining impure copper in the molten phase.

In the conventional method, molten copper was introduced into a processing chamber through a number of reaction chambers in countercurrent to the heated gas to remove impurities; The last reaction chamber, viewed in the direction of flow, contains fuel and oxygen gas.
The following gases are supplied at a ratio below the stoichiometric ratio, and reduced heating gas is produced by combustion in the absence of oxygen. Furthermore, in this method, by additionally supplying an oxygen-containing secondary gas in the reaction chamber that is located before the last reaction chamber, the fuel that has not yet been combusted and is entrained in the heated gas is removed. Combustion takes place.

The technical and economic advances achieved by this method require it to be made even more complete with the economy of fully automatic process control. To further improve this copper refining process, it has hitherto been difficult to precisely, at least quantitatively, regulate the heat and mass exchange of the gas phase/metal melt in the reaction mechanism.

K to make it possible to quantitatively control the reaction mechanism.
It is necessary to create and maintain controllable, reproducible, but in any case forced convective and mass exchange conditions between the reactant gases and the molten phase-copper/sludge.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve the above-mentioned conventional steel refining process so that it can be carried out with a controllable reaction course both in terms of quantity and quality.

It is proposed that the melt phase of the metal bath as a gas and m- to this metal bath.

In this case, a particularly advantageous method is to provide, before the secondary gas is combusted with the heated gas containing the fuel, essentially a loincloth in the form of at least one energy-rich radial stream of gas focused by an accelerating nozzle. The gas is blown vertically onto the surface of the metal bath and brought into contact with this surface so that a constant mass transfer from the gas to the gold bath takes place.

This method is of great significance because a gas radial stream is forced into contact with the metal bath, displacing the suspended sludge layer, and in a manner that allows the flow density to be regulated. This is because in the convective field of liquid gold KIi, a rapid and even controllable exchange of substances takes place.

In order to advantageously have this process, the present invention provides that the secondary gas is caused by a laminar flow of the melt rotating essentially in an annular manner about the blowing pressure existing in the branch point of the gas radial flow. We propose to inject with a large surface radiation force to the extent that reaction units with constant mass transfer are generated, which are divided by the convection state of the system along with the radiant flow.

By this method it is possible to obtain an advantageous, particularly rapid reaction course which can therefore be readily defined by the magnitude of the process regulation made possible by the constant energy.

The reaction of the liquid steel with the reaction gas takes place essentially within the range of the blowing position resulting from the gas damming of the bath, and the surface size at this blowing position can be measured, and therefore Since it can be regulated and kept constant, the state of mass transfer can be quantitatively controlled. Another advantage of the invention over known methods lies in this, namely the possibility of programmable control of the copper smelting process. In this case, care must be taken to prevent the bath from "splattering" in order to prevent disturbances, which occur, for example, when bath movements are too vigorous. This is because, on the one hand, this "splatter" disturbs the equilibrium of the regulated reaction and thus the regulating performance, and, on the other hand, at least locally leads to overoxidation phenomena with the formation of oxidized steel. These two phenomena are undesirable. A final method according to the invention here is to adjust the radiation force and the distance of the nozzle orifice from the bath surface, depending on the type of reactant gas used, so that the metal bath does not actually splash.

The invention will now be explained in more detail with reference to an embodiment of the bladder illustrated in the accompanying drawings.

The fa1 diagram shows a rectangular melting furnace l. This melting furnace has partition wall 2
, 3.4 three tub-shaped reaction chambers.

It is divided into 6.7 parts. Inside the partition wall 2 there are grooves 9 through which a molten copper phase flows. Bath-like quasi-IO is observed in the reaction chamber 6. Below this bath water rate is a liquid copper bath 11. There is a sludge layer above the bath water rate! There is a will. 13 sludge openings in the furnace wall! Refining to oxidize - OK to deposit from reaction chamber 6
Helpful. With benevolence number 14, it is supplied into the furnace l in the form of molten liquid,
At the outlet end of the reaction chamber 6 in the flow direction of the copper leaving the furnace 1 after refining at a position 15, a partition plate 8 serves to retain the sludge. Liquid copper passes through a flow port 16 provided below the bath level lO, and passes through a partition plate 8. A closable opening 17 in the furnace wall of the reaction chamber 5 serves for the storage and supply of solids, such as copper concentrate and/or fuel; the exhaust gases leave the furnace I through a chimney 19. A burner 36 is provided on the closed side of the end wall 18 for heating.

During operation, liquid crude steel is placed in the furnace l at position 14 and/or
Alternatively, copper concentrate and fuel are supplied at 17.

In zone 5' the heating of the material is increased to a processing temperature suitable for subsequent refining. In zone 6 via nozzle rod 20 the oxygen-containing reaction gas is blown in the form of a focused energy-rich gas radial stream 21 onto bath surface 1.0 of molten copper 11 . A throttle valve 22 provided in the neck 23 of the nozzle rod 20 is used to control the blowing energy and the discharge energy.
is helpful. Blowing pressure 24 at surface 10 of copper bath 11
is clearly recognized. This blowing pressure 24 has the shape of a concave bowl. In the vicinity of this blowing pressure, the dynamic pressure of the diverted gas radial stream 21 forces the four-lunge layer 12 laterally away from the molten copper bath 11. This phenomenon is shown enlarged in FIG. 2, based on what was observed experimentally.

The opening 25 in the nozzle bar 20 is visible. A gas radiation stream 21 is discharged from this opening 25 and hits the sludge layer 12 above the molten bath 11 with great energy. Conversion range @2
The dynamic pressure of the gas radial flow 21 in the sludge layer 21 is pushed back. On the bare surface of the molten bath 11 K[12$
” is formed, and below this eye 28
A concave blowing pressure 24, designated B, is created in the metal molten bath II. The diverted gas flows back into the surrounding chamber at 29.

Excited by the contact with the gas radial stream 21 and its zonal force, and under the influence of the rising force in the periphery of the blowing pressure 24 in the melt 11, a strong bath turbulence occurs in the form of an annular flow zone. A state of torque 27 occurs in one flow direction.

In figure 7M1, another nozzle rod 3° for blowing the reaction gas into the steel bath in the reaction chamber 7 can be seen.

This nozzle rod 30i;j is provided at its head with two connections 32 and 33, of which 32i is for the carrier gas supply, and the other 33 is for the supply of fuel such as diesel oil, natural gas, propane, lime powder. It is intended to supply the following.

The throttle valve 3.4.35 serves to regulate the pressure and thus the flow density of the energy and gas radiant streams.

Next, the embodiments of the method according to the present invention will be described as follows.

1. Before the secondary gas is combusted with the heated gas containing the fuel, the secondary gas is combusted in essentially a monumental metal bath ( !l), characterized in that it is blown approximately perpendicularly onto the surface (lO) and brought into contact with said surface (10) in such a way that a constant mass transfer from the gas to the metal bath (11) takes place, A method of continuously refining impure copper.

2. Transfer the secondary gas to the turning point (26) of the gas radial flow (21)
A laminar flow (27) of the melt rotating essentially annularly about the blowing pressure (24) existing at the gas radial flow (24)
1) characterized by blowing with such a large radiation force as to produce a reaction unit with constant mass transfer, delimited by the convective shape 11 of the system! 1 Method described in mK.

3. The first method is characterized by adjusting the discharge force and the distance of the nozzle opening from the bath surface (tO) according to the am of the reaction gas used so that the metal bath does not actually scatter.
The method described in section.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the furnace installation used in this invention, and Fig. 2 shows the opening of the nozzle rod, together with the sludge layer, which emits a radial stream of gas onto the steel fII molten bath present below the nozzle rod. figure. The code in the figure is 11...Metal bath

Claims (1)

[Claims] 1. Copper in the form of a melt is guided through a number of reaction chambers in a processing chamber in a countercurrent state to the heated gas, during which impurities are removed, -Fuel and oxygen gas-containing gas are supplied to the last reaction chamber at a ratio below the stoichiometric ratio, and by combustion in the absence of oxygen, the reduction heating gas is reduced, and the gas is heated before the last reaction gas chamber. By additionally supplying an oxygen-containing secondary gas in the existing reaction chamber, an after-combustion of the fuel which has not yet been combusted and is entrained in the heated gas takes place in the melt phase of the metal bath (11). 2. A process as described above, characterized in that the second method is carried out in such a way that a constant mass transfer takes place, and then, for the first time, is combusted together with a heated gas.