METHODS OF RECYCLING SCRAP METAL BRASS AND BRONZE
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
2.
KNITU
3.
KNITU
4.
KNITU
Type:
Article
Pages:
from 115
to 120
Status:
In work
Language:
Russian
Keywords:
METALLURGICAL SLAGS, BRONZE, BRASS, LEACHING, SULFURIC ACID, ZINC, COPPER, ELECTROLYTE, ELECTROREDUCTION, WASHING WATERS
Abstract (English):
The development of technology, especially in the field of electronics, mechanical engineering and construction, has led to an increase in the use of non-ferrous, rare and noble metals, their alloys and compounds. The demand for these materials is steadily growing, stimulating both the extraction of ore from new deposits and the search for alternative sources. Among them, returnable metal-containing raw materials stand out - scrap, waste, secondary resources. As a result of many years of mining and processing, the production of ferrous and non-ferrous metals produces mountains of waste, often containing many valuable components. Of particular interest are scrap scrap brass and bronze. Brass and bronze are alloys with a high copper content, but in addition to copper, they contain significant amounts of zinc, as well as tin, nickel and other elements that can also be extracted and used. When creating a processing method, one should take into account the qualitative composition of raw materials, the degree of oxidation of metals in scrap brass and bronze, environmental friendliness and safety of the method. The technology for producing zinc and copper from brass and bronze waste has been studied and developed. As a leaching method, sulfuric acid, agitation was used. According to the "hot leaching" scheme of brass, metal copper released by chemical precipitation consists of 84% Cu, 14% Zn, and bronze - 81% Cu, 15% Zn. When leaching bronze, in addition to copper and zinc, tin with a content of 70% precipitates from the solution when it is cooled. During electroreduction of solutions, metallic copper is precipitated with a content of the main substances of 99%. According to the "cold" leaching scheme of brass, the metal copper released by chemical precipitation consists of 58% Cu, 39% Zn. During electroreduction, copper is precipitated from the solution with a content of the main substances of 99%, zinc with a content of the main substances of 91%, and partially 6.5% of copper.
The development of technology, especially in the field of electronics, mechanical engineering and construction, has led to an increase in the use of non-ferrous, rare and noble metals, their alloys and compounds. The demand for these materials is steadily growing, stimulating both the extraction of ore from new deposits and the search for alternative sources. Among them, returnable metal-containing raw materials stand out - scrap, waste, secondary resources. As a result of many years of mining and processing, the production of ferrous and non-ferrous metals produces mountains of waste, often containing many valuable components. Of particular interest are scrap scrap brass and bronze. Brass and bronze are alloys with a high copper content, but in addition to copper, they contain significant amounts of zinc, as well as tin, nickel and other elements that can also be extracted and used. When creating a processing method, one should take into account the qualitative composition of raw materials, the degree of oxidation of metals in scrap brass and bronze, environmental friendliness and safety of the method. The technology for producing zinc and copper from brass and bronze waste has been studied and developed. As a leaching method, sulfuric acid, agitation was used. According to the "hot leaching" scheme of brass, metal copper released by chemical precipitation consists of 84% Cu, 14% Zn, and bronze - 81% Cu, 15% Zn. When leaching bronze, in addition to copper and zinc, tin with a content of 70% precipitates from the solution when it is cooled. During electroreduction of solutions, metallic copper is precipitated with a content of the main substances of 99%. According to the "cold" leaching scheme of brass, the metal copper released by chemical precipitation consists of 58% Cu, 39% Zn. During electroreduction, copper is precipitated from the solution with a content of the main substances of 99%, zinc with a content of the main substances of 91%, and partially 6.5% of copper.
Keywords:
METALLURGICAL SLAGS, BRONZE, BRASS, LEACHING, SULFURIC ACID, ZINC, COPPER, ELECTROLYTE, ELECTROREDUCTION, WASHING WATERS
METALLURGICAL SLAGS, BRONZE, BRASS, LEACHING, SULFURIC ACID, ZINC, COPPER, ELECTROLYTE, ELECTROREDUCTION, WASHING WATERS
