JP2000345250A - Method for smelting lead - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the treating capacity in the existing equipment even in the case of increasing a zinc leaching residue as the treating object by executing a concentrating process of float with plural sets of thickeners connected with a series in the case of extracting a lead concentrate through a lead floatation and the concentrating process of the float. SOLUTION: Tailing of copper floatation is supplied to the lead floatation, and a Pb-rich float is extracted. The Pb-rich float comes into a first float- thickener 5 and the overflow is fed to a second copper thickener at the copper side to obtain an under-flow pulp as the lead concentrate. The lead concentrate comes in a second floatation thickener 6 to obtain an under-flow pulp as an enriched lead concentrate. The enriched lead concentrate comes in a mixing thickener 7 together with lead source of a lead sulfate, lead slag, etc. as by- product in a smelting plant and the under-flow pulp is dehydrated with a filter press 8 to obtain the mixed lead sulfate. The lead sulfate is charged into a leas electric furnace after drying in order with rotary dryers 9, 10 connected with the series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a lead smelting method using a zinc leaching residue as a part of a raw material.

[0002]

2. Description of the Related Art Generally, valuable metals such as Cu and Pb remain in a zinc leaching residue. Therefore, it is desirable to collect these as individually as possible and use them as a part of each smelting raw material.

[0003] In this case, first, the zinc leaching residue is subjected to copper flotation,
Cu is transferred to the flotation side and Pb is transferred to the tailing side. The flotation containing Cu is concentrated and dehydrated with a thickener, and then dried together with the copper concentrate as the main raw material to be used as a charging material for the copper smelting furnace. , On the other hand,
Copper flotation tailings containing Pb are subjected to lead flotation,
A convenient method is to obtain a rich flotation, concentrate it with a thickener to form a lead concentrate, charge it with other lead sources in a lead electric furnace, and recover Cu and Pb.

[0004]

As mentioned above, when recovering valuable metals from zinc leaching residue by a wet method, once the process is installed, if the processing raw materials increase for some reason, the equipment is not used. Then things happen that cannot be dealt with.
In order to cope with this, it is necessary to relatively increase the processing capacity of the entire processing equipment in each process, and the cost for adding the equipment becomes enormous.

Therefore, it is advantageous to cope with the increase in the amount of raw materials to be processed by increasing the processing speed in each facility while keeping the existing facilities as much as possible (with the existing capacity). However, there is a limit to uniformly increasing the processing speed in each processing step, such as flotation, concentration (sedimentation), dehydration, and compression.

An object of the present invention is to solve such a problem and to find a method for improving the processing capacity of existing equipment as much as possible even when the zinc leaching residue to be processed increases.

[0007]

According to the present invention, there is provided a lead smelting method for collecting lead concentrate from a zinc leaching residue through a flotation process of the lead and a concentration of the flotation according to the present invention. In the present invention, there is provided a lead smelting method characterized in that the flotation enrichment step is performed by a plurality of thickeners connected in series. Further, according to the present invention, the tailings after the copper leaching of the zinc leaching residue are subjected to lead flotation, and the flotation is concentrated by a plurality of flotation thickeners connected in series to collect lead concentrate. The lead concentrate and the lead source containing sulphate-containing lead sulfate are supplied to a mixed thickener to collect the mixed lead sulfate deposits, and the mixed lead sulfate deposits are dehydrated and dried. Provide a lead smelting method to be charged to

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In particular, Cu and Pb
When copper is recovered as copper concentrate and lead concentrate by the wet method,
It was found that if the concentration of the flotation of lead flotation was improved, the throughput could be increased even with existing equipment. In other words, if the amount of treated zinc leaching residue exceeds that of existing equipment, the amount of flotation from the lead flotation process will increase,
If it takes time to concentrate the flotation, it will be a great obstacle to the flow of the entire equipment, and it will be difficult to cope with an increase in the throughput. However, it was found that as long as the concentration time of this flotation could be reduced, the overall processing speed could be increased without adding much to other facilities.

Therefore, it is conceivable to install a thickener for concentrating the flotation to cope with an increase in the throughput. However, when treating liquids in parallel with thickeners arranged in parallel, it is possible to simply cope with the increase in the amount of processing liquid for the added thickeners, but it is not possible to increase the concentration of flotation, and eventually The load on the process cannot be reduced. However, it was found that when the treatment liquid was treated in series with a series of thickeners, the concentration of flotation was increased and the treatment speed was increased, and the increase in the amount of treatment liquid could be dealt with efficiently.

An embodiment of the present invention will be described below with reference to FIG. Fig. 1 shows the wet leaching of the zinc leaching residue and the charge for the copper smelting flash furnace (flow in the left half of Fig. 1) and the charge for the lead smelting electric furnace (the right half of Fig. 1). Flow chart) is shown.

First, the zinc leaching residue is subjected to copper flotation,
It is divided into rich flotation and Pb-rich tailings. The flotation enters the cuprous thickener 1, the underflow pulp is sent to the filter press 2, and the overflow is sent to the second copper thickener 3, and the underflow pulp is returned to the cuprous thickener 1. Filter press 2
The residual copper concentrate is obtained through a rotary dryer-4 together with separately produced copper concentrate, and is dried and then charged into a flash smelting furnace.

On the other hand, tailings of copper flotation are subjected to lead flotation,
B-rich flotation is collected. Since the tailings contain Cu, they are sent to the cuprous thickener 1. The Pb-rich flotation enters the first flotation thickener 5 and its overflow is sent to the second copper thickener 3 on the copper side to obtain underflow pulp as lead concentrate. This lead concentrate is the second flotation thickener 6
To obtain underflow pulp as concentrated lead concentrate. The concentrated lead concentrate enters the mixed thickener 7 together with a lead source (including at least lead sulfate) such as lead sulfate and lead slag by-product of the smelter, and the underflow pulp is dewatered by the filter press 8. Obtain mixed lead sulfate. Rotary dryers 9 and 1 with this mixed lead sulfate connected to a series
After drying in order at 0, it is charged into a lead electric furnace.

[0013] In this way, the raw material charged into the flash smelting furnace for copper smelting and the raw material charged into the electric furnace for lead smelting are separated and collected from the zinc leaching residue by a wet method. By adding the second flotation thickener 6 for enriching the ore, even if the amount of zinc leaching residue to be received increases by about 20%, it can be treated with existing equipment. The reason is
(1) The flotation thickener 5 and the mixed thickener 7 of the lead flotation have a great influence on the flow of the whole process, and (2) the underflow pulp of the flotation thickener 5 It is conceivable that the sedimentation speed in the mixed thickener 7 is increased by re-concentrating it in the second flotation thickener 6 and concentrating it in a series.

Table 1 shows the case where underflow pulp of flotation thickener 5 was sent to mixed thickener 7 (comparative example).
And the case where the underflow pulp of the flotation thickener 5 is concentrated by the second flotation thickener 6 and the underflow pulp is sent to the mixing thickener 7 (example of the present invention).
This is a comparison between the specific gravity of the underflow pulp of the mixed thickener 7 and the amount of the wet treatment liquid.

[0015]

[Table 1]

As can be seen from the results in Table 1, in the example of the present invention, the specific gravity of the underflow pulp of the mixed thickener 7 is increased, that is, the flotation is further concentrated, and the amount of the wet treatment liquid is reduced by about 10%. Was completed. Therefore,
It is possible to cope with an increase in zinc leaching residue as a processing raw material.

[0017]

As described above, according to the present invention,
When lead concentrate is collected from the zinc leaching residue by the wet method and used as a raw material for the lead electric furnace, even if the treatment amount of the zinc leaching residue increases, the treatment amount can be increased only by partial modification. Therefore, productivity can be increased with a small economic burden.

[Brief description of the drawings]

FIG. 1 is a process chart showing an embodiment of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C22B 3/44 C22B 19/20 7/00 B09B 5/00 ZABJ // C22B 15/00 C22B 3/00 S 19/20 15/12 (72) Inventor Kazuo Kumagai 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Kosaka Smelting & Refining Co., Ltd. (72) Inventor Satoshi Nakagawara 1-8-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) in Saka Smelting Co., Ltd. 4D004 AA43 AB03 BA05 CA10 CA13 CA42 CB15 4D059 AA11 BB04 BD22 BE16 BE31 BE41 4K001 AA09 AA20 AA30 BA16 CA02 CA09 DB24 DB25 GA13

Claims (3)

[Claims] In a lead smelting method for extracting lead concentrate from a zinc leaching residue through a lead flotation process and a concentration process of the flotation,
A lead smelting method, wherein the enrichment process of flotation is performed by a plurality of thickeners connected in series. 2. The lead smelting method according to claim 1, wherein the lead flotation is performed on the tailings after the copper leaching of the zinc leaching residue. 3. The tailings after the zinc leaching residue is subjected to copper flotation are subjected to lead flotation, and the flotation is concentrated by a plurality of flotation thickeners connected to a series to collect lead concentrate. The lead concentrate and the lead source containing lead sulfate, which is a by-product of the smelter, are supplied to the mixed thickener to collect the mixed lead sulfate deposits. The mixed lead sulfate deposits are dehydrated and dried, and then mounted in a lead electric furnace. Lead smelting method to enter.