SU1527301A1 - Method of processing tin-containing slurry - Google Patents

Abstract

The invention relates to the processing of raw materials for the production of non-ferrous metals or their compounds, in particular to the processing of industrial wastes, and can be used to obtain metal products from waste from the production of hot tinning of copper and copper alloys. The purpose of the invention is to simplify the process and provide the possibility of processing tin-lead sludge, as well as improving the quality of metal products with a copper content of more than 0.1%. The processing of tin-containing sludge is carried out by high-temperature heating and reduction-sulphidation treatment. Before heating, the sludge is washed with water from fluxes and acid residues of the tinning process, followed by reduction and sulphidation at 390-420 ° C with an old coal carburizer in relation to the sludge 1: (6-15). When the copper content in the sludge more than 0.1% recovery and sulfatirovnie lead with the addition of thiourea in the ratio of copper 1: 1. 1 hp ff, 2 tab.

Description

The invention relates to the processing of raw materials for the production of non-ferrous metals or their compounds, in particular, to the processing of industrial waste, and can be used to obtain metal products from the production of hot tinning Copper and copper alloys.

The aim of the invention is to simplify the process and ensure the possibility of processing tin-lead sludge, as well as improving the quality of the final product when the copper content in the sludge is more than 0.1%.

The method is carried out as follows: o5-fia3j i.

Before heating the sludge, it is washed with water from the flux and acid residues of the tinning process, and the reduction and sulfatization is carried out at 390-420 ° C with charcoal carburizer taken in relation to the 1: (6-15) sludge.

The washing of the sludge with water from the flux and the acid residues of the process of tinning before its high-temperature heating makes it possible to reduce the corrosion activity of the alloy to the body of the bath.

Sulfidation and reduction at 390-20 ° C is caused by the fact that, as tests have shown, at a temperature below 390 ° C, the process is slow and not complete, and at a temperature above 420 ° C, volatile organic substances are burned (visually, this process is accompanied by the release of large the amount of smoke) used in their beneficial use for the recovery operation.

The use of a standardized charcoal carburizer intended for cementation of steel parts (composition, wt.%: Charcoal - base; sulfur not more than 0, volatile substances not more than 8; barium carbonate 20 + 2; carbon dioxide not more than 2), allows it is used effectively for cleaning tin-lead sludge from impurities, for reducing oxides of tin and lead, and for sulphidizing sludge (binding copper impurity to copper sulphide, which is then sorbed as sludge with charcoal).

Thus, the introduction of a carburizer allows one to simplify the process technology, since a ready-made composition of the substance is used, which ensures reduction and sulphidation due to the detected properties.

As a result of using the carburizer, the duration of the process is shortened, the technological capabilities of the method are expanded, i.e. it allows the processing of not only tin-containing sludge, but also tin-lead sludge from the production of hot tinning of copper and copper alloys.

The quantitative composition of the charcoal carburizer, taken in relation to the sludge 1: (6-15) may. H, is optimal from the point of view of obtaining a metal product suitable for processing (Table 1). With a ratio greater than 1: 6 (up to 1:15 inclusive), the product yield remains almost unchanged (), and with ratios less than 1: 6, for example, 1: 3, the product yield drops to 86 due to the large volumetric ratio of carburizer to the sludge and, as a result, insufficient heating of the processed mixture. A similar result for obtaining a suitable product is observed at a ratio of more than 1:15. Thus, the ratio of 1:17 is 85. With a ratio of carburizer and sludge within 1: (6-15), the output is

The total product is maximized for and is 88-96.

At 380 ° C, the yield of the finished product is 8U, and at 430 C it decreases to 80 (Table 2).

In tab. Figure 1 shows the data on the regeneration of sludge at a temperature of 390-420 ° C and various ratios of the carburizer to the sludge.

Table 1

In tab. 2 shows the data on the regeneration of sludge at a ratio of carburizer and sludge 1:10 and different temperatures.

table 2

When the copper content in the sludge is more than 0.1, the reduction and sulphidation are carried out with the addition of thiourea to the carburizer in a ratio of 1: 1 to copper.

Thiourea reacts with copper contained in a wet (after flushing) carburizer, according to the equation

2CU + (NH) CS lpCu S + COif - (- 2NH3f.

The presence is established in the sludge separated from the remelting, and the formation of a strong alkaline solution by passing gaseous products formed through the water indicates the release of ammonia. The release of gases contributes to the formation of the use of the proposed method allows, compared with the known method, to process tin-lead sludge, to simplify the process

antioxidant atmosphere in the processing of sludge and neutralization of acid flux residues in the sludge. The optimal should be considered wearing 1: 1 between thiourea and copper, thanks to the use of the standard contained in the sludge. This is confirmed by the carburizer, and in this case it is obtained by reducing the tin content of copper containing for use after processing the sludge with lead solder (the amount of impurities by the carburizer (which is self-Q, not more than,%: Cu-0.10 Fe 0.02; S but can provide refining from copper, if the latter does not exceed the content in the sludge 0.1%. So, if the copper content in the sludge is 0.22%, this dependence is expressed as follows, 020).

Claims (2)

1. A method of processing tin-containing sludge, including high-temperature heating and reducing sulphidation treatment, characterized in that thio-copper The copper content in the target product,%: 0.16 0.11 0.06 0.06 As can be seen, an increase in the ratio (in thiourea) above 1: 1 does not give a reduction in copper. The use of thiourea makes it possible to expand the technological possibilities of the process in the processing of sludge. To improve the quality of metal products with a copper content in the sludge more than 0.1% as an additive 25 and reduction and with lead prim carburizer in slurry 1: (6-15). I 30 2. The way pop. u and with the fact that, of course, the quality of the copper content in the restoration process is not, and the sul are given with the addition of te thiourea is applied to the carburizer. wearing copper 1: 1. The use of the proposed method allows, compared with the known method, to treat tin-lead sludge, to simplify the process due to the use of a standard carburizer, and at the same time to obtain a tin-lead solder suitable for using tin (amount of impurities not more than,%: Cu-0.10; Fe 0.02; S due to the use of a standard carburizer, and at the same time to obtain a tin-lead solder suitable for using tin (amount of impurities not more than,%: Cu-0.10; Fe 0.02; S 0.020). Invention Formula due to the use of a standard carburizer, and at the same time to obtain a tin-lead solder suitable for using tin (amount of impurities not more than,%: Cu-0.10; Fe 0.02; S 1. A method of processing tin-containing sludge, which includes high-temperature heating and reducing sulphidation treatment, characterized in that simplifying the process and allowing the processing of tin-lead sludge before washing the sludge is washed with water from flux and acid residues of the tinning process, and reduction and sulphidation are carried out with a charcoal carburizer in the ratio of sludge 1: (6-15). 2. The way pop. , differing from the fact that, in order to improve the quality of the final product with a copper content of more than 0.1%, the reduction and sulfidation is carried out with the addition of thiourea in relation to copper 1: 1.