Low-temperature reduction smelting method for lead-containing compound

Abstract

Disclosed is a low-temperature reduction smelting method for a lead-containing compound. The lead-containing compound and starch are added into a ball mill simultaneously to be subjected to ball milling and mixing. The mixed materials are continuously conveyed into a smelting pot for indirect heating and are smelted after being heated to a required temperature. Produced wet lead is subjected to electrolytic refining treatment. The essence of the technical scheme is that the starch serves as a reducing agent under an indirect heating condition, and the purpose of producing the wet lead from the lead-containing compound through reducing smelting is realized. The direct recovery rate of the lead can reach 96.0% or above. The starch serves as the reducing agent, the reducing smelting temperature is lowered to 800-850 DEG C, and the energy consumption of low-temperature reducing smelting of the lead-containing compound is greatly lowered.

Description

technical field

[0001] The invention relates to a pyrometallurgical process in the field of non-ferrous metallurgy, in particular to a pyrometallurgical method for low-temperature reduction and smelting of lead-containing compounds. Background technique

[0002] Lead is one of the elements of Group IVA in the periodic table, with atomic number 82, atomic weight 207.21, density 11.34g / cm³, melting point 327.43°C, and boiling point 1525°C. The physical properties of lead are low hardness, high density, low melting point, good ductility, poor ductility, poor electrical and thermal conductivity, easy volatilization at high temperature, and high melt fluidity. Lead is chemically inactive and forms PbO on the surface in humid air 2 The film loses metallic luster and turns dark gray. When lead is heated in air, the formation sequence of oxides with the increase of temperature is: PbO→Pb 2 O 3 →Pb 3 O 4 →PbO 2 , the high valence oxide of lead will decompose into PbO and O whe...

Examples

Embodiment 1

[0028] The main components of lead-containing compounds are (%) by weight: Pb75.0% and H 2 O3.0%, the starch used is wheat starch. Add 2000g of lead compound and 180g of wheat starch into the ball mill, control the ratio of ball to material (the ratio of the weight of stainless steel balls to the weight of lead compound in Kg) to 1.0:1, add stainless steel balls with a diameter of 5mm, start the ball mill, and keep the rotation speed at 90r / min ball milling for 60 min. After the ball milling, the mixture is added to the smelting pot. The temperature of the smelting pot is maintained at 810 ℃ by the external heating method of burning coal. The stirring is started to keep the rotation speed at 120 r / min. The yield reached 96.8%.

Embodiment 2

[0030] The main components of lead-containing compounds are (%) by weight: Pb75.0% and H 2 O3.0%, the starch used is wheat starch. Add 2000g lead compound and 160g rice starch into the ball mill, control the ratio of ball to material (the ratio of stainless steel ball weight to lead compound weight Kg) to 1.0:1, add stainless steel balls with a diameter of 5mm, start the ball mill, and keep the rotation speed at 90r / min ball milling for 60 minutes, after the ball milling, the mixture is added to the smelting pot, the temperature of the smelting pot is maintained at 815 ℃ by the external heating method of burning coal, the stirring is started to maintain the rotation speed at 120 r / min, and the weight of crude lead is 1460 g. The yield reached 97.3%.

technical field

[0001] The invention relates to a pyrometallurgical process in the field of non-ferrous metallurgy, in particular to a pyrometallurgical method for low-temperature reduction and smelting of lead-containing compounds. Background technique

[0002] Lead is one of the elements of Group IVA in the periodic table, with atomic number 82, atomic weight 207.21, density 11.34g / cm³, melting point 327.43°C, and boiling point 1525°C. The physical properties of lead are low hardness, high density, low melting point, good ductility, poor ductility, poor electrical and thermal conductivity, easy volatilization at high temperature, and high melt fluidity. Lead is chemically inactive and forms PbO on the surface in humid air 2 The film loses metallic luster and turns dark gray. When lead is heated in air, the formation sequence of oxides with the increase of temperature is: PbO→Pb 2 O 3 →Pb 3 O 4 →PbO 2 , the high valence oxide of lead will decompose into PbO and O whe...

Examples

Embodiment 1

[0028] The main components of lead-containing compounds are (%) by weight: Pb75.0% and H 2 O3.0%, the starch used is wheat starch. Add 2000g of lead compound and 180g of wheat starch into the ball mill, control the ratio of ball to material (the ratio of the weight of stainless steel balls to the weight of lead compound in Kg) to 1.0:1, add stainless steel balls with a diameter of 5mm, start the ball mill, and keep the rotation speed at 90r / min ball milling for 60 min. After the ball milling, the mixture is added to the smelting pot. The temperature of the smelting pot is maintained at 810 ℃ by the external heating method of burning coal. The stirring is started to keep the rotation speed at 120 r / min. The yield reached 96.8%.

Embodiment 2

[0030] The main components of lead-containing compounds are (%) by weight: Pb75.0% and H 2 O3.0%, the starch used is wheat starch. Add 2000g lead compound and 160g rice starch into the ball mill, control the ratio of ball to material (the ratio of stainless steel ball weight to lead compound weight Kg) to 1.0:1, add stainless steel balls with a diameter of 5mm, start the ball mill, and keep the rotation speed at 90r / min ball milling for 60 minutes, after the ball milling, the mixture is added to the smelting pot, the temperature of the smelting pot is maintained at 815 ℃ by the external heating method of burning coal, the stirring is started to maintain the rotation speed at 120 r / min, and the weight of crude lead is 1460 g. The yield reached 97.3%.

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