SU897880A1 - Method of processing bismuth-containing sulfide industrial products - Google Patents

Description

I

This invention relates to the metallurgy of bismuth and can be used to extract bismuth from sulfide middlings;

A method of processing bismuth-containing sulfide polymetallic products is known, including chlorinating roasting with trapping bismuth chloride with a soda solution {11.

The closest to the invention in technical essence and the achieved result is a method of processing bismuth-containing sulfide middling products, including sulfatizing roasting and leaching of calcine 12.

However, this method has not sufficiently high extraction of bismuth. In addition, the calcine is leached in two stages.

The purpose of the invention is to increase the degree of extraction of bismuth and simplify the process.

The goal is achieved by the fact that according to the method of processing bismuth-containing sulfide middlings,

After sulphating roasting and leaching of the cinder, it was dried at 520-580 ° C, and leaching was carried out with a solution of sulfuric acid.

The process is carried out as follows.

Claims (2)

The sulphide product containing 0.1-0.25% Bi is placed in a tube furnace where air is fed. The firing temperature is 520-580 C. Preferably 560C, the process takes 1.5-2 hours. At the exit of the furnace, the gases are trapped in water. The resulting solution has a pH of 1.5. After the calcination is finished, the calcine is leached with this solution at 8090 ° C for 2 hours. The ratio of the volumes of T: W-1: -3. In this case, bismuth, copper and silver are recovered in solution with a yield close to 100%. Bismuth, copper and silver can be separated from the solution by cementation with iron. In this case, receive a cement sediment containing,%: Bi 5-8; Si 89-92; Hell 0.1-0.2. Iron content and content 389 cement sediment does not exceed 1% when removed into solution with a yield of 1-3% and 4-6%, respectively. The messed-up bismuth cement sponge obtained in this way can be processed according to the copper production scheme with associated extraction of bismuth and silver. In addition to this, other methods for extracting these metals from solution can be used. In particular, bismuth can be isolated from the solution when diluted with water in the form of poorly soluble basic salts, and copper after separation of the precipitate by cementation from the filtrate. The resulting basic bismuth salt, after appropriate purification, can be converted to metallic bism or more bismuth compound required. The firing temperature is preferred, however, a decrease or increase in temperature in the range of 520-580 ° C does not significantly affect the extraction of valuable components into the solution. Lowering the firing temperature below 5-20 ° C leads to a sharp decrease in bismuth recovery. Thus, at 500 ° C, the extraction of bismuth is 40%. Increasing the temperature above .5 ° C to 80 ° C equally reduces the recovery of both bismuth and copper. In addition, an increase in the calcination temperature leads to an increase in the recovery of the mouse. If the process is carried out in the range of 520-ZVO C, then the mass contained in the industrial products, mainly in the form of arsenopnrite, is recovered with a yield not exceeding .4%. Example 1. 20 g of sulfide middling containing,%: Bi 0.21; Si 3.3; Fe 45; As 1.24; P 0.06; S 22; Hell 0,012, placed in a tube furnace, which serves air. The intermediate product is kept in an oven at 520 ° C for 2 hours. The resulting gases, along with air, are passed through water, resulting in a solution of sulfurous acid, having a pH of 1.5. After the end of the cinder process, the solution is leached with the above solution at 80 for 2 hours, the volume ratio of T: W is 1: 3. The half-moon solution is diluted to a specific volume and analyzed for metal content by an atomic absorption method. Found that extraction in solution. %: Bt 99.6; Si 94.9; Hell 73; As not detected; Fe 1.7. PRI m e, p 2. 20 g of a sulfide middling of the same composition are placed in a tubular furnace and burned at 1.5 hours with air supply. Leaching of calcine is carried out in the same manner as in Example 1. The recovery in solution is,%: Bi 98.7; C 99.3; Hell 82.0; As, 4.0; Fe 0.7. Example 3. 20 g of sulphide intermediate product of the same composition is subjected to sulphatizing roasting at. The process is carried out as indicated in Example 1. From the resulting solution, bismuth, copper and silver are cemented with iron. Extraction of metals into the solution is,%: Bi 99.8; C 98.2; As 2,3; Fe 0.15; Ag 89.3. The resulting cement sediment contains,%; Bi 7.0; Ag o, 2; C 91.3; Fe 1.0; As 0.8 Extraction of metals in cement sediment is,%: Bi 96.2; Si 94.3; Hell 78, 2. Example 4. 20 g of a sulfide middling of the same composition is subjected to sulphating calcination at 650 ° C. The process is carried out analogously to example I. The extraction into the solution is%: Bi 19.5; Si 21.0; Hell 54.0; As 18.5; Fe 2.7. Example 5. 20 g of sulphide intermediate product of the same composition is subjected to sulphating roasting and leached with hydrochloric acid by a known method. Removing the solution is,%: B1 47.9; Si 86.7; As 78.7; Fe 11.0; Ag 6.7. From the above examples, it follows that the most optimal temperature is about (5 burns is 560 ° C. In addition, from example 5, it can be seen that the use of sulfuric acid for cinder leaching leads to a decrease in bismuth extraction and to an increase in extraction of iron and iron. Use of the proposed method processing of bismuth-containing industrial products; / ktov provides compared with the known increase in the degree of extraction of bismuth due to the use for leaching of races; solutions with sulfuric acid, reducing the degree of extraction of the arcuate due to lower firing temperature. In addition, the method allows the processing of bismuth-containing raw materials without the costs of sulfuric and hydrochloric acids, which is especially convenient for enterprises that are not directly associated with sulfuric acid production. This method is more convenient as it provides for the extraction of all valuable components of the raw material at single step leaching. Claim method A method of processing bismuth-containing sulfide middlings, including sulfatizing roasting and leaching of calcine, characterized in that, in order to increase recoveries bismuth and simplify the process, firing is conducted at 520-580 C, 58978804 but. leaching is carried out with a solution of ser-1. Copyright svdedelstvo USSR № 159291, acid hygrochloride from 22 to 30/06. 1963. Sources of information, 2. USSR Copyright Certificate № 610876, taken into account during examination. From 22 to 30/06, 1976.