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Method and system of treating tin-containing lead slag

A tin-lead and pellet technology, applied in the field of metallurgy, can solve the problems of great potential harm to the ecological environment, waste of resources, difficult to decompose, etc., and achieve the effects of significant economic and environmental benefits and low energy consumption costs.

Pending Publication Date: 2018-05-29
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lead slag generally contains a variety of valuable metals such as Pb, Zn, Fe, Ag, In, Sn, Cu, etc. If it is directly stockpiled, it will not only cause a huge waste of resources, but the Pb and Zn in the slag will be destroyed under the action of rainwater. It infiltrates into the soil and groundwater, and it is not easy to decompose. The pollution it causes has the characteristics of concealment, long-term and irreversibility, and has great potential harm to the ecological environment.

Method used

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  • Method and system of treating tin-containing lead slag
  • Method and system of treating tin-containing lead slag

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Composition of tin-lead slag: 26wt% TFe, 6wt% lead, 8wt% zinc, 0.8wt% tin, crush the tin-lead slag to less than 0.5mm, first make lignite cue balls, the diameter of the pellets is 5-10mm, and Mix tin-lead slag and dolomite, tin-lead slag, brown coal, and dolomite in a ratio of 10:2.9:1.2, wrap the mixture of tin-lead slag and dolomite outside the lignite cue ball, four Basic alkalinity is 0.8. After drying the prepared pellets, put them into the rotary hearth furnace for roasting, the rotary hearth furnace is equipped with a preheating zone, SnO 2 Reduction zone and discharge zone, SnO 2 The reduction zone temperature is set to 910°C, the reduction time is 22min, SnO 2 The concentration of CO in the reduction zone is 2v%, and the concentration of oxygen is 1v%. After the pellets pass through the rotary hearth furnace, the SnO 2 SnO in the tin-containing dust collected from the flue in the reduction zone 2 The content is 42wt%, the tin content in the metallized pelle...

Embodiment 2

[0071] Composition of tin-lead slag: 30wt% TFe, 4.1wt% lead, 3.8wt% zinc, 0.6wt% tin, crush the tin-lead slag to less than 0.5mm, first make lignite cue balls, the diameter of the pellets is 5-10mm , after the tin-lead slag is crushed, mix the tin-lead slag scrap with dolomite, and mix the tin-lead slag and dolomite with the ratio of 10:3.1:1.3 The mixture is wrapped outside the lignite cue ball, and the quaternary alkalinity is 1.0. After drying the prepared pellets, put them into the rotary hearth furnace for roasting, the rotary hearth furnace is equipped with a preheating zone, SnO 2 Reduction zone and discharge zone, SnO 2 The reduction zone temperature is set to 950°C, the reduction time is 25min, SnO 2 The CO concentration in the reduction zone is 4v%, and the oxygen concentration is 1.3v%. After the pellets pass through the rotary hearth furnace, the SnO 2 SnO in the tin-containing dust collected from the flue in the reduction zone 2 The content is 45wt%, the tin c...

Embodiment 3

[0073] Tin-containing lead slag composition: TFe 34wt%, lead 2.7wt%, zinc 3.2wt%, tin 0.4wt%, the tin-lead slag is crushed to less than 0.5mm, and lignite is first made into cue balls, and the diameter of the pellets is 5-10mm , after the tin-lead slag is crushed, mix the tin-lead slag fragments with dolomite, and mix the tin-lead slag and dolomite with the tin-lead slag fragments, lignite and dolomite according to the ratio of 10:3.3:1.4 The mixture is wrapped outside the lignite cue ball, and the quaternary alkalinity is 1.2. After drying the prepared pellets, put them into the rotary hearth furnace for roasting, the rotary hearth furnace is equipped with a preheating zone, SnO 2 Reduction zone and discharge zone, SnO 2 The reduction zone temperature is set to 980°C, the reduction time is 28min, the SnO 2 The CO concentration in the reduction zone is 5.6v%, and the oxygen concentration is 1.7v%. After the pellets pass through the rotary hearth furnace, the SnO 2 SnO in th...

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Abstract

The invention discloses a method and a system of treating tin-containing lead slag. The method comprises the following steps of supplying the tin-containing lead slag into a crushing device for crushing treatment so as to obtain tin-containing lead slag scraps; supplying coal materials into a first formation device for first formation treatment so as to obtain first pellets; supplying the first pellets, the tin-containing lead slag scraps and an additive into a second formation device for second formation treatment so as to enable the outer surfaces of the first pellets to be wrapped with thetin-containing lead slag scraps and the additive, and obtaining second pellets; supplying the second pellets and carbon monoxide into a reduction roasting device for reduction roasting treatment so asto obtain tin-containing dust and metallized pellets; and supplying the metallized pellets into a smelting separation device for smelting separation treatment so as to obtain molten iron, lead and zinc containing dust and tailings. The method can recover tin and iron in the tin-containing lead slag step by step, can recover elements of lead, zinc and the like in the lead slag at the same time, islow in energy consumption cost and has remarkable economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular, the invention relates to a method and a system for treating slag containing tin and lead. Background technique [0002] Lead slag mainly refers to the waste slag discharged from the lead pyrometallurgy process, and also includes the waste slag with high lead content discharged from other metal smelting processes. According to different lead smelting methods, lead slag can be divided into blast furnace slag, rotary kiln slag, reverberatory slag, fuming slag, etc. In recent decades, my country's lead smelting industry has developed rapidly. According to the data of the World Metal Statistics Bureau (WMBS), my country's total lead output reached 4.665 million tons in 2016, accounting for 41.94% of the world's total output. As of November of that year, lead consumption 3.9403 million tons, accounting for 40% of the world's total consumption. However, with the rapid development of t...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/248C22B1/02C22B13/02C22B25/06
CPCC22B1/02C22B1/248C22B7/004C22B7/04C22B13/025C22B25/06Y02P10/20
Inventor 吴佩佩古明远王敏王健月王福佳曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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