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A method for iron extraction by reduction smelting of lead slag

The technology of lead slag and reducing agent is applied in the fields of molten pool smelting, volatilizing and separating lead and zinc, recovering iron, and lead slag reduction smelting and iron extraction, which can solve the problem that iron resources in lead slag cannot be efficiently recycled and reused. Take advantage of the lack of effective methods and other problems to achieve the effects of short smelting time, low carbon consumption and excellent quality of pig iron products

Active Publication Date: 2016-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, there is currently no effective method for the recycling of iron resources in lead slag, so that the iron resources in lead slag cannot be recycled efficiently.

Method used

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  • A method for iron extraction by reduction smelting of lead slag
  • A method for iron extraction by reduction smelting of lead slag
  • A method for iron extraction by reduction smelting of lead slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Grind 100g of water-quenched lead slag to -200 mesh (74um) and account for more than 90%. The contents of Zn, Pb, and Fe in the slag are respectively 4.28%, 0.07%, and 22.84%. Add graphite powder C / Fe=1.6, Calcium oxide was added to control the alkalinity to 1.2, mixed evenly, nitrogen was introduced, and smelted at 1575°C for 15 minutes to obtain pig iron with an iron content of 93.74%, and the iron recovery rate was 99.61%.

Embodiment 2

[0032] Grind 100g of unwater-quenched lead slag to -200 mesh (74um) and account for more than 90%. The contents of Zn, Pb, and Fe in the slag are 4.55%, 0.02%, and 30.51% respectively. Add graphite powder C / Fe=1.6 , mixed with calcium oxide to control the alkalinity to 1.2, mixed evenly, fed with nitrogen, and smelted at 1575°C for 15 minutes to obtain pig iron with an iron content of 94.92%, and the iron recovery rate was 96.87%.

Embodiment 3

[0034]Grind 100g of blast furnace slag until -200 mesh (74um) accounts for more than 90%. The contents of Zn, Pb, and Fe in the slag are 12.39%, 2.0%, and 24.10% respectively. Control the alkalinity of calcium oxide to 1.2, mix evenly, pass nitrogen, and melt at 1575°C for 15 minutes to obtain pig iron with an iron content of 93.11%, and the iron recovery rate is 98.58%.

[0035] It can be seen from the above examples that the method of the present invention can effectively recover the iron in the lead slag, the recovery rate of reduction smelting iron is 96.87-99.61%, and the iron content in pig iron is 93.11-94.92%. See Table 1 for the impurity content in pig iron under optimal conditions, and see Table 2 for the national standards for steelmaking pig iron. Comparing Table 1 and Table 2, it can be seen that under the optimal conditions of the present invention, the content of C in the pig iron reaches the national steelmaking pig iron standard, the content of P and S reaches...

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Abstract

The invention discloses a method for extracting iron through reduction smelting of lead slag. The method comprises the following steps: adding a slagging agent and a reducing agent into the lead slag, performing reduction smelting in an inert atmosphere, reducing lead and zinc in the slag, volatilizing, performing dust collection, layering a slag phase to obtain pig iron and furnace slag. According to the method, the iron recycling rate is greater than 99%, and a pig iron product is obtained; the pig iron product has the iron grade of being greater than 94.%, the sulfur content of being smaller than 0.03%, the phosphorus content of being smaller than 0.12%, the carbon content of being smaller than 1.4% and the silicon content of being smaller than 0.23%, the phosphorus content and the sulfur content reach the national steelmaking pig iron level-1 standard, and the silicon content reaches the L04 number standard. According to the method, the iron in the lead slag can be effectively recycled, the process flow is short, the process operation is simple, the pollutant emission is less, the iron recycling rate is high, the pig iron product is excellent in quality, lead, zinc and other valuable metals can be enriched and recycled, and economic benefits and environmental benefits are very high.

Description

Technical field: [0001] The invention belongs to the intersecting fields of metallurgical engineering and environmental engineering, and relates to a method for reducing and smelting lead slag to extract iron, in particular to a method for performing molten pool smelting volatilization of lead metallurgical waste slag, separating lead and zinc, and recovering iron. Background technique: [0002] my country's lead production and consumption rank first in the world. Lead slag is generally the smelting slag of pyrometallurgy, which contains 21-31% iron, 2-15% zinc and 0.02-3% lead. At present, a large amount of lead slag is piled up, occupying land resources and polluting the environment. The treatment of lead slag mainly focuses on the recovery of lead, zinc and scattered metals in lead slag, the use of lead slag as filling materials for underground pits, the production of glass and ceramics, the production of building materials such as bricks and block cement, etc., but a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00C22B13/00C22B19/30C22B7/04
CPCY02P10/20
Inventor 彭兵柴立元李燕春闵小波刘恢袁莹珍刘志楼林冬红胡明雷杰彭宁
Owner CENT SOUTH UNIV
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