JPS5993843A - Treatment of raw material containing silver - Google Patents

Abstract

PURPOSE:To absorb gold and silver at a high yield in formed crude lead by compounding the smallest possible amt. of a lead raw material with silver concentrate contg. arsenic in a high rate, and reducing the same by melting. CONSTITUTION:A lead raw material contg. lead in the form of oxide at 10-100 times of the content of silver contd. in a raw material contg. gold, silver and arsenic and a reducing agent is added to the raw material and the mixture is reduced by melting so that gold and silver are absorbed in the formed crude lead. The amt. of the reducing agent to be added is so adjusted that the lead in the slag formed in this stage maintains >=3.5% grade, thereby migrating the arsenic in the raw material into the crude lead. The silver grade in the formed crude lead is increased to about >=1% if the amt. of the lead raw material to be added is limited in the above-mentioned way. The growth of a speiss phase is prevented if the lead grade of the formed slag is limited and the amt. of the reducing agent to be added is controlled. As a result, the migration rate of silver to crude lead is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the recovery of silver in high yield by melting and reducing a silver raw material containing a large amount of arsenic as an impurity.
The present invention relates to a method for processing raw materials containing silver to obtain T-performance.

In hydrometallurgical zinc smelting, the gold in the raw ore is concentrated in the leaching residue, so these are collected as silver ore by the flotation method from the neutral leaching residue. Also, according to another method,
Sulfate M by mixing Nokuillite with the pouring and leaching residue! ! After calcination, thrust lead, steel, etc. can be leached out, and the leached residue can be flotated and recovered as silver tit ore. In particular, the latter case has the advantage that the silver contained in the filite can also be recovered at the same time.

In this way, the gold and silver grades of the recovered silver ore vary depending on the composition of the zinc ore, but are usually about 2 to 1 Oky/T, and the main component of the silver ore is hematite or It is iron oxide in the state of zinc ferrite. Such silver ore can also be mixed with other raw materials in a copper smelter or a lead wire smelter in small quantities. However, if the amount is high or contains a lot of impurities such as arsenic, the above mixing treatment is necessary for #! Since it does not have a considerable impact on the industry, it is preferable to treat it alone.The purpose of the present invention is to combine @Zhueite with a high arsenic content with as much of the Yuha starting material as possible, reduce and melt it, The object of the present invention is to provide a method for absorbing lead into crude lead in a high yield.

That is, the present invention basically involves adding a starting material containing lead in an oxide form and a reducing agent in an amount of 10 to 100 times the recorded content to a raw material containing silver and arsenic, followed by melting and reduction. Core gold and silver are absorbed into the coarse particles produced, and the amount of the reducing agent added is adjusted so that the copper grade in the slag produced does not fall below 3.5%. The structure is such that the arsenic contained therein is transferred into the fiber vessel.

When the amount of reducing agent is large and the copper content in the slag is less than 3.5%, the yield of lead is high, but on the other hand, a spice phase is produced.
A significant amount of silver is transferred to the spices, reducing the silver yield.

As described above, the method of the present invention adds a starting material containing lead in the oxide form to 1ysm concentrate with a high arsenic content to produce reduced melting (hereinafter simply referred to as #melting) L-C, crude lead, When absorbing gold and silver into this crude lead, the amount of starting material added should not exceed 100 times the amount of silver in terms of lead weight,
By controlling the amount of reducing agent added so as to increase the silver quality of the produced crude lead to 1 or more and to prevent the copper content of the produced slag from falling below 3.5, the spice phase is not produced.
This increases the transfer rate of silver to crude lead.

The starting materials used in the method of the present invention include lead concentrate lead concentrate;
It is a raw material that is low in lead in the form of pbo, Pb3O4, etc., such as smoke ash and lead sulfate.

In addition, in order to lower the melting point of the slag produced, appropriately blending solvents such as silica sand and limestone is the same as in normal lead smelting, but adding solvents to suppress the amount of slag produced It's annoying to keep the amount in check as much as possible. Further, coal or coke can be used as the reducing agent in the present invention.

'JHdLP may be heated by a burner such as a short rotary furnace or reverberatory furnace, but an electric furnace that generates a small amount of smoke and ash is suitable.

The efficiency of reducing agent usage varies depending on the type of furnace, the draft during operation, the type of starting material, etc., so the amount of reducing agent added is fi + 4 m using the copper grade in the slag as an indicator, but when coke is used, It is 5 to 10% by weight for each weight of silver ore and raw materials. The generated crude lead is extracted as appropriate, the grains are removed with a kerator, and the arsenic is removed to 1 to 2 tres, and then cast into an anode, and then cast into an anode using a normal t-folding process. Depending on the manufacturing method, electrolytic lead and slime can be replaced by one. In addition, the reason why the amount of the starting material was made 10 to 100 times the silver content was to ensure that the silver content of the produced crude lead was at least 1%, and if it was less than 10 times the silver content, the amount of starting material was made 10 to 100 times the silver content. This is because the absolute amount of silver that is distributed and becomes a loss cannot be ignored.

In this way, if the slag loss cannot be ignored by film treatment alone, the $ invention further applies the method shown in Figure 1.
The yield can be improved by performing two stages of i treatment. Whether or not to carry out two-stage treatment is a matter of economic considerations; for example, if the yield of the first acid treatment reaches 95 cm, then two-stage treatment is considered safe.

In the two-stage process of the present invention, the nuclear lead raw material to be mixed with silver ore and smelted is divided into two parts, and in the first step, a part of the starting raw material is added to the silver-containing raw material and smelted. In the second process, only the slag produced in the first step is separated, and the remainder of the starting material is boiled therein for further reduction. In the first step, in order to prevent the formation of spices, a reducing agent is added to keep the copper grade of the slag above 3.5, preferably 4 to 5.
1ift must be controlled. When the copper grade of the slag is within this range, as shown in Figure 2, the ratio of the crude lead and the silver grade of the slag is 70 to 100, as shown in Figure 2, without significantly reducing the actual yield of silver. Moreover, the production of spices can also be suppressed.

It is better to use separate furnaces for each process in this two-stage process.
However, when a single furnace is used, the first step is to smelt a predetermined batch of zangji ore, extract the resulting crude lead in its entirety, and
After leaving only slag in the furnace, the candy raw materials, reducing agent, solvent, etc. to be treated in the second step are added to further reduce the slag. At this time, even at the end of the reaction in the second step, if the lead content of the slag is 3.5% or more, the production of spice will be suppressed. The newly generated crude lead absorbs the silver contained in the candy raw materials and the silver in the slag. Since the silver content is at a level of about 1/Io compared to that in step A, the silver quality of the produced crude lead is also low (therefore, the silver quality in the slag is 50 to 1100p).
It can be lowered to P. The combined silver yield of the first and second steps is 97-98 inches.

In the second step, by increasing the amount of reducing agent, it is possible to reduce the lead quality of the slag to 20% or less, thereby improving the lead yield. In this case, as shown in Figure 2, the ratio of silver quality between crude lead and slag is 20 (1 degree, so
The translation yield also improves.

On the other hand, the formation of spice is unavoidable, but this can be treated by repeating the first step, and since spice is not the final product, there is no need to consider the loss of silver to the spice phase. The crude lead with a high silver content thus obtained is divided into electrolytic lead and slime using a tS tumbler in a conventional manner, and the slime is further sent to a silver harvester.

When electrolyzing, if the content of ``ei'' in the lead is too high, normal electrolysis cannot be carried out, so it must be removed to an allowable limit in advance. easily done by

Next, the present invention will be explained in more detail with reference to examples, but the present invention is limited by the following examples as long as it does not go beyond the gist of the invention. The composition of the ore and auxiliary raw materials is shown in Table 1.

Preheat 1.000 parts of iron concentrate in an 800KVA electric furnace preheated to 200°C or higher.

Approximately 5 T of the charge mixed with 180 parts of lead sintered ingot, 300 parts of ridge sand, 200 parts of limestone, and 90 parts of coke # (approximately 8 inches for the total amount of iron concentrate and lead sintered ingot) was put in and melted. 1. I paid f yuan.

Dust in the exhaust gas was captured with a cyclone and bag filter and subjected to continuous KPK repetition. The composition of the output is shown in Table 2.

Table 1 Composition of raw materials Table 2 Output composition Example 2 Example IK After melting 5T of charged raw material, all the produced crude lead was extracted, while the slag remained in the furnace, and the lead sintered ingot was 5ooky and coke powder (80k) were charged to carry out reduction. All of the collected dust was returned to the furnace. After charging was completed, the product was allowed to stand for about 1 hour, and then the entire product was taken out.
After taking the samples, the crude lead and spices were recycled into the furnace. The analytical values of the product are shown in Table 3 A.

Next, 5T of the same charged raw material as in Example 1 was melted. The dust was continuously cycled into the furnace. After melting, the crude lead was extracted, but no spice layer was observed. The composition of the product at this time is shown in Table 3 B@.

The estimated silver yield calculated based on the analysis of the product is 9.
It is 7 to 98 chi.

Table 3 Note: Same as crude lead and slag in Table 2

[Brief explanation of the drawing]

FIG. 1 is a 70-sheet showing the two-stage processing of silver mining, and FIG. 2 is a graph showing the relationship between the lead grade of slag and the silver distribution ratio. Patent Applicant Mitsubishi Metals Co., Ltd. Agent Shiroyo Bonao No. 1 M To the refining process Fig. 2 0? 4
6 slabs, 4 buttons, Pb close

Claims (1)

[Claims] +11 A candy raw material containing 10 to 100 times the silver content of lead in the form of oxide and a reducing agent are added to the raw materials containing gold, - and arsenic and melted/Ii ! II reduction is performed to absorb gold and silver into the crude lead produced, and if the lead grade in the slag produced at that time is 3.5% or less, the amount of the reducing agent added is set in the FA clause as shown in rjLA. A method for treating a raw material containing silver, which comprises transferring the arsenic present in the raw material into the crude lead. (2) For raw materials containing gold, silver and arsenic, the content of 1
It was produced in the first step and the first step of dividing the original 1sF containing 0 to 100 times the amount of lead in the form of oxide into two parts, adding part of the candy raw material and a reducing agent, and melting it into four parts. It consists of two steps: adding the remaining candy raw material and the reducing agent to the slag, and further redeeming the slag. In the second step, the amount of the reducing agent added is adjusted so that the spice phase is not generated by adjusting the amount of the base agent added, and the lead content of the slag is 3.5 tin or less in the second step. 7a-Characteristics: 14. Among the crude lead and spices produced, at least the spices are repeated in the first step, and the arsenic is finally transferred into the crude lead. A method for processing raw materials rich in silver.