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Method for producing microcrystalline cast stone by reducing secondary slag subjected to iron removal by utilizing molten-state nickel slag

A molten nickel slag and molten slag technology, applied in the field of comprehensive utilization of resources, can solve problems such as no iron extraction treatment, and achieve the effects of cost reduction, waste avoidance and high quality

Active Publication Date: 2013-10-09
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nickel slag belongs to high-iron nickel slag and has not been treated for iron extraction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) The mass percentage of the main chemical components of the secondary slag after the reduction of molten nickel slag to extract iron is: SiO 2 43.47%, MgO 21.55%, CaO 17.4%, Fe 2 o 3 7.4%, Al 2 o 3 6.94%, Cr 2 o 3 1.33%, K 2 O 0.58%, the balance is impurities; silica sand as a composition regulator, SiO 2 content of 99.0%; limestone as a component regulator, CaO content of 50%, Fe 2 o 3 The content is 0.1%; bauxite as a composition regulator, Al 2 o 3 The content is 67%, Fe 2 o 3 The content is 1%; Sodium saltpeter as clarifier, NaNO 3 The content is 99.5%, Fe 2 o 3 The content is 0.005%; as a clarifying agent, industrial grade antimony oxide, Sb 2 o 3 Content 99.0%; Zircon sand as nucleating agent, ZrO 2 The content is 65.0%.

[0021] (2) The secondary molten slag after the reduction and iron extraction of molten nickel slag is directly discharged into the electric heating homogenization tank by hot charging, and the composition regulator silic...

Embodiment 2

[0030] (1) The mass percentage of the main chemical components of the secondary slag after the reduction of molten nickel slag to extract iron is: SiO 2 43.47%, MgO 21.55%, CaO 17.4%, Fe 2 o 3 7.4%, Al 2 o 3 6.94%, Cr 2 o 3 1.33%, K 2 O 0.58%, the balance is impurities; silica sand as a composition regulator, SiO 2 content of 99.0%; limestone as a component regulator, CaO content of 50%, Fe 2 o 3 The content is 0.1%; bauxite as a composition regulator, Al 2 o 3 The content is 67%, Fe 2 o 3 The content is 1%; NaNO3 content is 99.0% for sodium saltpeter as a clarifying agent, Fe 2 o 3 The content is 0.005%.

[0031] (2) The secondary molten slag after the reduction and iron extraction of the molten nickel slag is directly discharged into the electrothermal homogenization tank by hot charging, and the composition regulator silica sand, limestone and bauxite, and the clarifying agent sodium saltpeter are added at 1450 ° C. A total of 2.5h insulation.

[0032] (...

Embodiment 3

[0039] (1) The mass percentage of the main chemical components of the secondary slag after the reduction of molten nickel slag to extract iron is: SiO 2 47.4%, MgO 10.44%, CaO 26.4%, Fe 2 o 3 5.54%, Al 2 o 3 6.34%, Na 2 O 0.38%, K 2 O 0.73%, the balance is impurities; silica sand as a composition regulator, SiO 2 content of 99.0%; limestone as a component regulator, CaO content of 50%, Fe 2 o 3 The content is 0.1%; bauxite as a composition regulator, Al 2 o 3 The content of NaNO3 is 67%, and the content of Fe2O3 is 1%. As a clarifying agent, the content of NaNO3 is 99.0%. 2 o 3 The content is 0.005%; the industrial grade antimony oxide as a clarifying agent, the content of Sb2O3 is 99.0%; 2 o 3 The content is 99.2%; zircon sand as a crystal nucleating agent, ZrO 2 The content is 65.0%.

[0040] (2) The secondary molten slag after the reduction and iron extraction of molten nickel slag is directly discharged into the electric heating homogenization tank by hot...

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PUM

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Abstract

The invention discloses a method for performing molten-state tempering on secondary slag subjected to iron removal by directly utilizing molten-state nickel slag and directly producing microcrystalline cast stone. The method comprises the following steps of: reducing the secondary slag subjected to iron removal by the molten-state nickel slag, directly discharging the slag into an electric heating equalizing basin in a hot charging mode, adding a component regulator, a clarifying agent and a nucleating agent, keeping the temperature at the process temperature of not less than 1,450 DEG C, and removing the produced dross and bubbles during the temperature keeping period, so that the materials are fully clarified and are equalized into molten mass; performing casting molding when the viscosity of the melt is 10-100Pa.s; performing microcrystalline treatment on the molded object at the nucleating temperature of 630-800 DEG C, and keeping the temperature of 0.5-3 hours, wherein the temperature rise rate is 5-10 DEG C per minute, the crystallization temperature is 900-1,000 DEG C, maintaining the temperature for 0.5-3 hours, wherein the cooling rate is 5-10 DEG C per minute, or performing furnace cooling to obtain industrial microcrystalline cast stone.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of resources, and in particular relates to a method for directly preparing microcrystalline cast stone by using molten nickel slag to reduce secondary molten slag after iron extraction and quenching and tempering. Background technique [0002] Jinchuan nickel concentrate contains 35% to 41% iron, of which 98% iron enters the slag during the nickel smelting process. It is estimated that the company's nickel smelting system produces a total of 1.6 million tons of nickel slag each year, containing 3,428 tons of nickel, 3,883 tons of copper, 1,510 tons of cobalt, and 675,783 tons of iron. The grade of iron in nickel slag is about 42%. Jinchuan Company uses flash furnace nickel slag as raw material, and the production line for producing alloy steel by reducing and extracting iron from molten nickel slag by hot charging and hot delivery has achieved small-scale production. But while generating...

Claims

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Application Information

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IPC IPC(8): C04B32/00C22B7/04
CPCY02P10/20
Inventor 杨志强倪文高术杰刘玉强马永峰吕清华杨鸿朱纪念樊昱张思奇张福利刘晓圣王长龙
Owner JINCHUAN GROUP LIMITED
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