JPS6220841A - Treatment of copper converter slag - Google Patents

Abstract

PURPOSE:To accelerate mutual separation of slag and matte in a melt and to recover matte by separation efficiently at a low cost by charging copper converter slag in melt condition into a settling furnace and by blowing a reducing agent into the above melt to reduce magnetite. CONSTITUTION:The copper converter slag in melt condition is charged into the settling furnace and then the reducing agent such as pulverized coal, coke, heavy oil, LP-gas, ammonia, etc., is blown into the above melt from a tuyere or by means of a lance etc., if necessary, together with a flux such as SiO2 etc. In this way, magnetite in the melt is reduced to form FeO and flowability in the above melt is improved, so that mutual separation of slag and matte can be accelerated and matte can be recovered from converter slag by separation in high yield.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a method for efficiently separating and recovering chains mixed in the remains of a converter generated in a copper smelting process.

(b) Prior art Copper concentrate, which is a sulfide such as CuFe5y, is generally smelted in a flash furnace, blast furnace 9 reverberatory furnace, etc.
It becomes S-type casting and then becomes blister copper in a converter.

At this time, the FeO-5iO2-based converter ↑ man produced and discharged from the converter contains gold, silver, copper, and Kawa, which is a concentrate of chain and ring valuable metals.

However, conventional methods for treating this converter r1 include a) a method in which the remains of the converter are transported on a slag conveyor, cooled, solidified, and pulverized, and the slag mixed into the converter n is separated and recovered by flotation; (shown in Figure 1), or b) The converter 3A is transferred to a smelting furnace, settling furnace, etc. as a melt, and a small amount of coke, etc. is added and suspended in the melt 1- of the converter casting to oxidize the surface of the melt.・While preventing solidification, the chains and wires of the converter are 17. Separation method (this flow is used in the second
However, in method 1-a, the smelting cost is high due to the intervention of the beneficiation process, and on the other hand, in the method described in (h), the remains of the converter contain magnetite at or near saturation. However, there were drawbacks such as poor fluidity, poor separation of the sludge, and very low yield of valuable metals and low efficiency.

(c) Disclosure and Examples of the Invention The present invention involves charging tin in a copper converter in a solution state into a settling furnace, and then injecting a reducing agent such as pulverized coal into the solution through a slat or with a lance to produce magnetite. By reducing , the fluidity of the solution is improved and the mutual separation of the chains and tin is promoted.

The recovered cast iron produced in the smelting furnace is oxidized in a converter to obtain blister copper. This flow is shown in Fig. 3.

Magnetite is reduced by the reduction method of the present invention and F
Since eO is formed, if necessary, can a flux such as 5i02 be injected at the same time as the reducing agent?

Or charge it separately and adjust the converter tin composition.

Although pulverized coal is used as an example of the reducing agent here, other solid reducing agents such as coke may also be used, and liquid reducing agents such as heavy oil or 1. A gaseous reducing agent such as P, G, or ammonia may also be used.

Next, Table 1 shows an example of the results of the conventional copper converter treatment method incorporating the flotation method.

(Left below) Table 1 In addition, the copper converter is repeatedly visited as a melt into a smelting furnace, settling furnace, etc., and coke, etc. is added from above, and the solution F
Table 2 shows an example of the treatment results using the conventional method of separating the castings from the converter while preventing oxidation and solidification of the solution surface.

(Left below) Table 2! Next, after charging the copper converter powder in a solution state into a settling furnace, pulverized coal as a reducing agent is blown into the solution to reduce the magnetite, thereby reducing the phase of the copper converter in the solution. Table 3 shows the results of the treatment according to the method of the present invention that promotes star separation.

Moreover, the relationship between the blowing grinding of the reducing agent and the copper quality during the visit to the converter is shown in FIG.

(Leaving space below) Table 3 (Pulverized coal: 6 x 10-3 tons/ton used in a converter) This method has the advantage of being able to separate and recover chickens from contaminated converter scraps at low cost and with high yield.

[Brief explanation of the drawing]

Figures 1 and 2 are flow sheets showing conventional processing steps for copper concentrate, Figure 3 is a flow sheet showing an example of processing steps for copper concentrate to which the method of the present invention is applied, and Figure 4 is a flow sheet showing copper concentrate in solution. The relationship between the copper grade in the pulverized coal and the amount of pulverized coal injected when pulverized coal is injected into the converter, and the relationship between the copper quality in the pulverized coal and the amount of pulverized coal injected into the converter, as well as the relationship between the amount of pulverized coal and the amount of pulverized coal injected into the molten coal. It is a graph showing a comparison of changes in quality. Patent applicant Dowa Mining Co., Ltd. Agent Patent attorney Asaga - Daido Patent attorney
Asaga - Tree Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] After charging the copper converter (■) in solution form into a settling furnace, a reducing agent is injected into the solution to reduce magnetite, thereby promoting mutual separation of (1) and (2) in the solution. Treatment method for copper converter ■.