Crude lead oxidizing and refining process and device
A technology for oxidizing and refining crude lead, which is applied in the field of process and equipment for oxidizing and refining crude lead, can solve the problems of insufficient tin content, poor working environment, and large lead loss, etc., and achieve high tin removal rate, low cost, and low lead loss. small loss effect
Inactive Publication Date: 2017-06-20
CENT SOUTH UNIV
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Problems solved by technology
[0003] In order to overcome the problems of large lead loss, long cycle, poor working environment and tin content after refining in the existing oxidative tin removal technology, which cannot meet the national standard No. 1 refined lead quality standard, the invention provides a high-efficiency tin removal technology. The loss is small, greatly improving the labor production environment, the cycle is short, and the cost is low. After refining, not only the tin content reaches the quality of the national standard No. 1 refined lead, but also the lead loss is less than 5%. Crude lead oxidation refining tin removal process
Method used
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Examples
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Effect test
Embodiment 1
[0040] Weigh about 2kg of lead (the mass percentage of metal tin is about 0.2%) and place it in the experimental device, and react at a temperature of 750°C, a vacuum of 52kPa, a stirring speed of 100rpm, and an oxygen-enriched air volume of 60mL / min. The oxygen-enriched air is a mixture of pure oxygen and air. In this test, the oxygen-enriched air contains 50% air by volume. After 80 minutes, the tin content in the tin-lead removal is 1.1ppm, and the lead loss rate is 4.6%.
Embodiment 2
[0045] In embodiment 1, the oxygen-enriched air containing 50% air volume percentage is replaced by 100% air, and all the other remain unchanged, except that the tin content in tin-lead is 2ppm, and the lead loss rate is 2%. It shows that when only air is introduced, the content of Sn in excluding tin and lead is lower than 5ppm, which can also meet the requirements and reduce the oxidation loss of lead metal.
[0046] The following examples all use air as the oxidant.
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Abstract
The invention discloses a crude lead oxidizing and refining detinning process and device. The process comprises the steps that under a sealed vacuum condition, temperature is raised to enable crude lead to be molten, air and/or oxygen are/is sucked from air inlets at the bottom of a reaction kettle to form small bubbles, stirring is conducted to be uniform, an oxidizing reaction is conducted, and detinned lead is obtained. According to the crude lead oxidizing and refining process and device, the oxygen content on the surface of molten lead can be decreased, oxidation of a large amount of lead on the surface of a melt can be reduced, and metallic lead losses caused by local overoxidation inside the melt lead can be avoided. When the process is applied for treating crude lead with the tin content ranging from 0.1% to 0.2%, the detinned lead with the tin content lower than 5 ppm can be obtained, and the tin content in the detinned lead reaches the tin content standard of national refined-lead first-grade products; and meanwhile, the lead loss is lower than 5%, the tin content in the slag phase is about 8%, and some defects in an existing detinning process are overcome.
Description
technical field [0001] The invention relates to a process and a device for oxidizing and refining crude lead. Background technique [0002] To remove tin by fire refining of crude lead, oxidation method and alkaline refining method are more commonly used at present. Although the oxidation refining method has simple equipment, easy operation, and low investment, its disadvantages are large loss of lead, low direct recovery rate, long working time, poor working conditions, high fuel consumption, and easy damage to equipment. The application of alkaline refining is relatively common. The main advantage of this process is that the tin removal process can be carried out at a lower temperature, the loss of lead is small, and the operating conditions are good. trouble. Therefore, the tin removal process for energy saving and emission reduction is an urgently needed technology for the crude lead refining industry. Contents of the invention [0003] In order to overcome the prob...
Claims
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IPC IPC(8): C22B13/06C22B9/04
CPCC22B9/04C22B13/06
Inventor 丘克强邹凌云甘霖
Owner CENT SOUTH UNIV
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