A kind of lead-thallium alloy and its production method

A production method and alloy technology are applied in the field of lead-thallium alloy and its production to achieve the effects of being beneficial to environmental protection and increasing economic benefits

Active Publication Date: 2016-04-20
HULUDAO ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the thallium-containing fumes produced by the lead-zinc smelting system and the copper-cadmium slag produced by the hydro-method zinc smelting system are processed by conventional processes to generate crude cadmium, and the crude cadmium is subjected to vacuum distillation, and metallic lead is added to the cadmium distillation residue. , using the high solubility of thallium in lead to form a high-grade lead-thallium alloy, which can be used as a raw material for subsequent large-scale extraction of thallium, and solve the technical problems of enrichment of thallium in production, recovery of metal thallium and prevention of environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A total of 142 tons of crude cadmium was put into the melting furnace, containing 0.29% thallium, and the primary evaporation temperature and vacuum pressure were controlled. When the primary condensation temperature dropped to 450°C, metal lead was added into the melting furnace, and a total of 1978kg of lead ingots were added, and the second time was continued. Vacuum distillation, and gradually increase the temperature of the vacuum furnace to 650°C. When the output of refined cadmium is 4668kg, the temperature of the condensation chamber drops to 300°C. Stop the vacuum pump, fill with nitrogen, cut off the power, and start casting the lead-thallium bottom slag. Ingots, 3429kg of thallium-containing alloys were produced.

[0016] Analysis results of main metals in lead-thallium alloy (mass percentage):

[0017] element copper thallium lead zinc cadmium content(%) 10.8 11.8 53.8 <0.02

Embodiment 2

[0019] A total of 105 tons of crude cadmium was put into the melting furnace, containing 0.35% thallium, and the primary evaporation temperature and vacuum pressure were controlled. When the primary condensation temperature dropped to 450°C, metal lead was added into the melting furnace, and a total of 1,750 kg of lead ingots were added, and the second time was continued. Vacuum distillation, and the temperature of the vacuum furnace is gradually raised to 660°C. When 4200kg of refined cadmium is produced, the temperature of the condensation chamber drops to 310°C at this time, the vacuum pump is stopped, the nitrogen is filled, the power is turned off and the slag is discharged, and the thallium-containing alloy is produced. 3070kg.

[0020] Analysis results of main metals in lead-thallium alloy (mass percentage):

[0021] element copper thallium lead zinc cadmium content(%) 13.58 11.98 51.51 <0.02

Embodiment 3

[0023] A total of 97 tons of crude cadmium was put into the melting furnace, containing 0.47% of thallium, and the primary evaporation temperature and vacuum pressure were controlled. When the primary condensation temperature dropped to 450°C, metal lead was added into the melting furnace, and a total of 1989kg of lead ingots were added, and the second time was continued. Vacuum distillation, and the temperature of the vacuum furnace is gradually raised to 680°C. When 4440kg of refined cadmium is produced, the temperature of the condensation chamber drops to 320°C at this time, the vacuum pump is stopped, nitrogen is filled, the power is turned off and the slag is discharged, and the thallium-containing alloy is produced. 3502kg.

[0024] Analysis results of main metals in lead-thallium alloy (mass percentage):

[0025] element copper thallium lead zinc cadmium content(%) 13.59 13.03 51.27 <0.02

21

[0026] Through actual testing, the main m...

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Abstract

The invention provides a production method of a lead-thallium alloy. The method comprises the following steps: crude cadmium preparation, crude cadmium melting, primary distillation of cadmium, secondary distillation of cadmium, and lead addition to produce the lead-thallium alloy. By using the technical control, every part by mass of lead-thallium alloy contains 45-55% of lead, 10-20% of thallium, 10-15% of copper, 20-25% of cadmium and less than 0.02% of zinc. By utilizing the characteristic of high solubility of thallium in lead, the thallium is produced in the form of the lead-thallium alloy, thereby implementing enriched recovery of the thallium; and thus, the method increases the economic benefit and is beneficial to environmental protection. The method is suitable for collecting thallium in lead zinc smelting smoke dust.

Description

technical field [0001] The invention relates to a metal smelting method in the field of nonferrous metal metallurgy, in particular to a lead-thallium alloy and a production method thereof. Background technique [0002] In the lead-zinc smelting process, thallium is mainly enriched in various smelting fumes, and finally enriched to a higher grade in the following three materials, one is the electric dust in the lead smelting process, and the other is the pyrometallic zinc smelting process Coking soot and high temperature dust, and the third is copper cadmium slag in the process of hydrometallurgy. After the above thallium-containing raw materials are treated by wet method, about 15% of thallium enters the crude cadmium, and the crude cadmium is vacuum distilled, and the refined cadmium contains less than 0.008% of thallium, which is sold directly; the distillation residue contains 65-70% of cadmium and 3- 5%, returned to the thermal zinc smelting system as ingredients, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C11/00C22C30/02C22C30/06
Inventor 郭天立奚英洲程永强
Owner HULUDAO ZINC IND CO LTD
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