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Method for low-temperature smelting of regenerated lead

A technology of regenerated lead and low temperature, which is applied in the field of low temperature smelting of regenerated lead, can solve the problems of not being used in industry, etc., and achieve the effect of increasing service life, high lead recovery rate and good economic benefits

Inactive Publication Date: 2015-03-25
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the above reasons, the above low-temperature alkaline smelting technologies have not been used in industry, and the current recycled lead resources still use the original high-temperature reduction smelting technology, so it is urgent to develop a practical recovery technology

Method used

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  • Method for low-temperature smelting of regenerated lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take the waste storage battery cement containing 68.76% lead and mix it with the broken grid containing 93.12% lead, the mixed material is 100kg, containing 76.31% lead. Continuously add the mixed lead material and reduced coal (15kg) into the sodium carbonate (200kg) melt at 900°C, the coke particle size is ≤10mm, and the stirring speed is 200 rpm. Obtain crude lead 72.89kg, lead recovery rate 94.31%, crude lead contains lead 98.74%. Take 50 kg of slag and soak it in 150 L of water at normal temperature, recover sodium carbonate and sodium sulfide step by step, concentrate and crystallize step by step to obtain 10 kg of sodium sulfide product, and the sulfur fixation rate exceeds 90%.

Embodiment 2

[0042] Take waste battery cement containing 68.76% lead and mix it with sulfide ore powder containing 20.14% lead and Au 4g / t. The mixed material is 100kg and contains 50.12% lead. Continuously add the mixed lead material and reduced coal (15kg) into the sodium carbonate (200kg) melt at 900°C, the coke particle size is ≤10mm, the stirring speed is 100 rpm, after adding the materials, keep it at 900°C for 0.5 hours, and the product is produced 47.08kg of crude lead was obtained, the lead recovery rate was 93.11%, the crude lead contained 99.12% lead, the crude lead contained Au 8.2g / t, and the direct gold recovery rate was 97.67%. Take 50 kg of slag and soak it in 150 L of water at normal temperature, recover sodium carbonate and sodium sulfide step by step, concentrate and crystallize step by step to obtain 18 kg of sodium sulfide product, and the sulfur fixation rate exceeds 90%.

Embodiment 3

[0044] Take the waste battery cement containing 68.76% lead and mix it with lead chloride slag containing 30.58% lead and Au 93.18g / t. The mixed material is 100kg, containing 60.48% lead and 12.14g / t gold. Continuously add the mixed lead material and reduced coal (15kg) into the sodium carbonate (200kg) melt at 900°C, the coke particle size is ≤10mm, the stirring speed is 100 rpm, after adding the materials, keep it at 900°C for 0.5 hours, and the product is produced 55.55kg of crude lead was obtained, the lead recovery rate was 90.21%, the crude lead contained 98.21% lead, the crude lead contained Au22.8g / t, and the direct gold recovery rate was 98.89%. Take 50kg of slag and soak it in 150L of water at normal temperature, recover sodium carbonate and sodium sulfide step by step, concentrate and crystallize step by step to obtain 13kg of sodium sulfide product, and the sulfur fixation rate exceeds 90%.

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Abstract

The invention relates to a method for low-temperature smelting of regenerated lead and belongs to the technical field of preparation of regenerated lead. According to the method provided by the invention, an alkaline environment is provided by sodium carbonate, regenerated lead raw material and / or lead ore powder are / is taken as a lead source, carbon is taken as a reducing agent, alkaline smelting is performed at the temperature of 800-1100 DEG C, three products, namely crude lead or precious lead, smelting slag and smoke gas are produced, most of gold, silver and other precious metals enter crude lead or precious lead, crude lead produced by smelting is settled to the bottom for discharge, sulfur enters the smelting slag in the form of sodium sulfide, after water leaching of the smelting slag, filtrate is concentrated and crystallized in steps to obtain sodium carbonate and sodium sulfide products, and after dedusting of the smoke gas, smoke dust returns into the raw material, and waste gas can be directly discharged after being absorbed by lye. The technical scheme provided by the invention has the advantages of low energy consumption, low cost, environmental friendliness and the like, and further has significant economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for smelting secondary lead at low temperature, and belongs to the technical field of secondary lead preparation. technical background [0002] my country is a country rich in lead resources in the world, ranking second in the world. It not only has a wide distribution and many types, but also has a good prospect for resources. However, with the large-scale development in recent years, the medium and high-grade mines of lead resources in my country have been decreasing year by year. Compared with the lead resources in the world, there are few large-scale deposits, medium and low-grade resources account for more than 50%, and the proven resource reserves that have been developed and utilized account for nearly 50%. 55%, the proportion of proven resource reserves that can be used for design and planning is relatively low, and most of the unused reserves are concentrated in mining areas with poor construction conditions an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00
CPCY02P10/20
Inventor 覃文庆刘维焦芬罗虹霖宋巍程增强张立余德胜
Owner CENT SOUTH UNIV
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