Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recycling tin from lead bullion

A crude lead and lead-tin technology, which is applied in the metallurgical field combining pyrotechnics and wet processes, can solve the problems of increasing secondary smelting costs, increasing tin recovery procedures, and high secondary smelting costs, thereby reducing refining costs and processing costs. The effect of low and high yield of tin products

Inactive Publication Date: 2014-11-12
蒙自矿冶有限责任公司
View PDF5 Cites 40 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this recycling method are: electrolysis of the crude lead anode without tin removal, high tin content will cause more tin to precipitate in the cathode, affecting the quality of the lead, and the anode is easily passivated; the lead anode slime produced by smelting The metal separation of tin blowing slag is poor, and more metals Pb, Sb, and Ag are taken away with the slag, especially antimony, which accounts for about 13% of the total antimony amount fed; it increases the cost of secondary smelting for repeated processing; the output of tin slag Low tin content (10-20%), low price;
[0004] There are also some lead smelting enterprises that use reverberatory furnace blowing to directly enrich tin from crude lead to obtain tin blowing slag, and then repeatedly reduce and smelt tin blowing slag to obtain tin alloy with the same composition as crude solder, and then send it to the tin factory for electrolysis or other processes. Recycling; this recycling method still has defects such as high energy consumption, high environmental pollution, and high secondary smelting costs for repeated processing in the production process.
[0005] These methods are all aimed at treating the tin-containing slag at different stages in the lead smelting process to achieve the purpose of tin recovery. This treatment method has tin scattered into different intermediate or final products, which increases the tin recovery process, and tin is used as a by-product. The product will also affect the quality of the lead

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recycling tin from lead bullion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: as figure 1 Shown, the concrete operation of the method for reclaiming tin in this crude lead is as follows:

[0021] (1) Crude lead originates from the sintered agglomerate after conventional sintering and desulfurization of lead concentrate and the high-leaching lead slag produced in zinc smelting, which is mixed and pressed into balls, and then reduced and smelted in a blast furnace together to contain tin-containing crude lead. After removing copper by melting in the anode pot, the composition is Pb92.68%, Sb5.02%, Cu0.052%, Sn0.92%, Ag2080g / t. Add saltpeter to 1.0 times the mass of the tin in the crude lead for oxidation, then add caustic soda to capture 1.3 times the mass of the tin in the crude lead to form sodium salt, add table salt to 0.4 times the mass of the tin in the crude lead, and make slagging when adding saltpeter additives The situation is carried out several times in batches, the temperature of the tin removal process is always kept at...

Embodiment 2

[0026] Embodiment 2: the method concrete operation of reclaiming tin in this crude lead is as follows:

[0027] (1) Crude lead originates from the sintered agglomerate after conventional sintering and desulfurization of lead concentrate and the high-leaching lead slag produced in zinc smelting, which is mixed and pressed into balls, and then reduced and smelted in a blast furnace together to contain tin-containing crude lead. The composition of crude lead after copper removal by melting in the anode pot is Pb91.83%, Sb5.21%, Cu0.050%, Sn1.37%, Ag2180g / t, the temperature of crude lead after copper removal is raised to 410°C, press Add saltpeter to 0.5 times the total amount of tin in crude lead for oxidation, then add caustic soda to capture 1.0 times the total amount of tin in crude lead to make sodium salt, add table salt according to 0.2 times the total amount of tin in crude lead, and then add saltpeter Additives etc. are carried out several times in batches depending on th...

Embodiment 3

[0032] Embodiment 3: the concrete operation of the method for reclaiming tin in this crude lead is as follows:

[0033] (1) Crude lead comes from the vacuum distillation and volatilization of low-tin crude lead purchased from a smelter. The crude lead composition after the tin-containing crude lead is smelted in the anode pot to remove copper is Pb92.05%, Sb5.11%, Cu0 .051%, Sn1.21%, Ag2109g / t, raise the temperature of the crude lead after copper removal to 410°C, add saltpeter at 0.8 times the total amount of tin in the crude lead for oxidation, and then add 1.1 times the total tin in the crude lead Add caustic soda twice to capture sodium salt, add salt at 0.1 times the total amount of tin in crude lead, and add saltpeter additives in batches for several times depending on the slagging situation. The temperature of the tin removal process is always kept at 430°C for tin removal. After 3.9 hours, the composition of the output tin removal slag is Pb35.51%, Sb3.31%, Sn11.89%, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for recycling tin from lead bullion, and belongs to the technical field of pyrogenic process and wet process combined metallurgy. The method comprises the steps that after liguation decoppering processing is carried out on the lead bullion, caustic soda, caustic soda and salt are added into the lead bullion according to the content of the tin in the lead bullion to gather and remove the tin in the lead bullion, and tin-rich slag is obtained; sodium carbonate and reduction coal are added into the tin-rich slag and all tin-containing slag produced by a lead smelting system, and the tin-rich slag and the tin-containing slag generate terne metal through reduction smelting; the terne metal is processed through vacuum distillation to obtain crude tin; highly purified precipitated tin is obtained from the crude tin through electrolytic refining of mixed acid with silicofluoric acid-sulfuric acid as an electrolytic medium, and the precipitated tin is processed through simple smelting to obtain a tin ingot product meeting the national standard. The method sets the precedent for producing tin ingot products through comprehensive utilization of tin resources obtained from lead through smelting, has the advantages of being concise in technology, high in tin product yield, low in processing cost and the like, particularly separates tin alloys through introduction of vacuum distillation, and has the significant advantages in the aspects such as energy conservation and environment protection.

Description

technical field [0001] The invention relates to a method for recovering tin from crude lead, and belongs to the technical field of metallurgy combining fire and wet methods. Background technique [0002] Lead concentrates are generally desulfurized by sintering first, converted from sulfides to oxides, and the oxides are then reduced to elemental metals, namely crude lead. Sintering blast furnaces are often used for smelting. Nowadays, oxygen-enriched molten pool smelting methods are often used to save the desulfurization link. The desulfurization and reduction reaction process is directly completed in the metallurgical furnace. Generally, the tin metal associated with lead concentrate is as low as 0.1-1%. In the production process, due to the characteristics of tin easy to oxidize and form alloys with other metals, the distribution in the smelting process is relatively scattered, and it is difficult to concentrate and recover. The smelting cost is high and the product low ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/14C22B5/16C22B13/06
Inventor 香钦华况正国沈江卢林
Owner 蒙自矿冶有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products