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Cadmia reduction smelting method for the preparation of low-phosphorus iron

A technology of zinc slag and ferrophosphorus, which is applied in the field of smelting waste slag from zinc smelting, separating lead and zinc, and recycling iron. It can solve the problems that iron resources in zinc slag cannot be recycled and there is no effective method for recycling, and achieve The effect of short smelting time, excellent quality and low energy consumption

Active Publication Date: 2015-09-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Cadmia reduction smelting method for the preparation of low-phosphorus iron
  • Cadmia reduction smelting method for the preparation of low-phosphorus iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Grind the acid leaching slag to -200 mesh (74um) and account for more than 90%. The contents of Zn, Pb, Fe, and S in the slag are 17.58%, 5.49%, 23.29%, and 7.62%, respectively, and add calcium oxide and magnesium oxide , silicon dioxide, control the alkalinity to 1.2, feed oxygen and roast at 900°C for 30 minutes, then heat up to 1300°C and bake for 30 minutes, feed nitrogen, add graphite powder to control C / Fe=1.6, and melt at 1575°C for 15 minutes, Pig iron with an iron content of 91.23% and a phosphorus content of 0.066% was obtained, and the iron recovery rate was 84.76%.

Embodiment 2

[0054] Grind the goethite slag to -200 mesh (74um) and account for more than 90%. The contents of Zn, Pb, Fe, and S in the slag are 14.19%, 2.3%, 32.15%, and 9.43% respectively. Calcium oxide, oxide Magnesium, silicon dioxide, control the alkalinity to 1.2, feed oxygen and roast at 700°C for 30 minutes, then heat up to 1300°C and roast for 30 minutes, feed nitrogen, add graphite powder to control C / Fe=1.6, and melt at 1575°C for 15 minutes , the iron content is 92.65%, the phosphorus content is 0.063% pig iron, and the iron recovery rate is 81.55%.

[0055] As can be seen from the above examples, the inventive method has effectively reclaimed the iron in the zinc slag, and under optimal conditions, the content of each element in the pig iron results (see Table 1) as seen, under the optimal conditions of the present invention, the content of C in the pig iron reaches the steelmaking pig iron national standard, P , The S content reaches the national special-grade standard for st...

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Abstract

The present invention discloses a cadmia reduction smelting method for the preparation of low-phosphorus iron. The method is as below: adding a slagging constituent into cadmia and roasting in an oxidizing atmosphere; then adding a reducing agent and conducting reduction smelting under an inert atmosphere; reducing the lead and zinc in the slag, volatilizing and entering into dust collection; and stratifying the slag phase to obtain pig iron and slag. The method reaches iron recovery of 84%, and obtains a pig iron product; and the iron grade is no less than 92.65%, contains 0.03% of lead, 0.001% of zinc and 0.06% of phosphorus, and reaches superfine class standards of the national steel-making pig iron. The invention can effectively recycle iron in cadmia, the pig iron product has low content of phosphorus, lead and zinc; the process is short, discharges few pollutants, and recycles lead and zinc, has good economic and environmental meaning.

Description

Technical field: [0001] The invention belongs to the intersecting fields of metallurgical engineering and environmental engineering, and relates to a method for preparing low-phosphorus pig iron by step-by-step smelting of zinc slag, in particular to a method for smelting and volatilizing zinc smelting waste slag molten pool to separate lead and zinc and recover iron. Background technique: [0002] my country is the world's largest producer of zinc. Zinc smelting mainly adopts the hydrometallurgy process. The waste residue (that is, zinc slag) produced by the hydrometallurgy process contains 20-35% iron, 15-25% zinc, and 5% sulfur. -20%, lead 2-10%. At present, a large amount of zinc slag is piled up, occupying land resources and polluting the environment. The treatment of zinc slag mainly focuses on the recovery of valuable metals such as zinc, lead, and silver in zinc slag, and the use of zinc slag in the preparation of building materials such as cement and concrete. There...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B13/00C22B19/30
CPCY02P10/20
Inventor 彭兵柴立元李燕春袁莹珍刘志楼闵小波刘恢林冬红胡明彭宁雷杰
Owner CENT SOUTH UNIV
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