Method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore

A technology for mixing and melting iron ore, applied in the field of resources and environment, can solve the problems of complex processing technology, harm to iron quality, low iron recovery rate, etc., to achieve the effect of effective recovery, reduction of coal loss, and promotion of improvement

Inactive Publication Date: 2010-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 2. Iron is enriched in magnetite through oxidation roasting-crushing magnetic separation process. This process has the disadvantages of low iron recovery rate and complicated follow-up treatment process
However, this process has the disadvantage that the copper in the mol

Method used

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  • Method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore
  • Method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore
  • Method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Copper slag (the mass percentage composition of each component in the copper slag is: FeO=49.6% in the reduction furnace, Fe 3 o 4 =5.1%, CaO=2.72%, SiO 2 =28.23%) in a completely molten state, grind the additive-CaO to a particle size of about 0.4mm (the addition of the slagging agent CaO satisfies Add it into the molten pool, and after it is completely melted, the molten pool is left to stand for 10 minutes. During the period, the iron ore and the second batch of additive CaF will be added 2 , CaO, etc. were ground to 0.9mm and mixed uniformly (the added mass of CaO The following alkalinity relationship should be satisfied:

[0043]

[0044] Additive 2 CaF 2 The mass percentage composition is 12.8%), joins in the reduction furnace. Stand still for 20 minutes, so that the components of copper slag, iron ore, and additives are fully coupled. The material in the furnace is in a completely molten state, and the spray gun is inserted into the depth of the molte...

Embodiment 2

[0046] Copper slag (the mass percentage composition of each component in the copper slag is: FeO=48.5%, Fe 3 o 4 =5.7%, CaO=2.83%, SiO 2 =28.62%) in a completely molten state, the additives CaO, CaCO 3 The mixture of the two is ground to a particle size of about 0.38mm (the amount of the slag forming agent CaO meets CaCO 3 The amount of in additive one is measured according to the amount decomposed into CaO in the end. Add it into the molten pool, and after it is completely melted, the molten pool is left to stand for 10 minutes. During the period, the iron ore and additive diCaF will be added 2 , CaO were ground to 1.2mm and mixed uniformly (wherein the added mass of CaO The following alkalinity relationship should be satisfied:

[0047]

[0048] Additive 2 CaF 2 The mass percentage composition is 11.7%), joins in the reduction furnace. Stand still for 25 minutes, so that the components of copper slag, iron ore, and additives are fully coupled. The material in ...

Embodiment 3

[0050] Copper slag (the mass percentage composition of each component in the copper slag is: FeO=49.3% in the reduction furnace, Fe 3 o 4 = 6.2%, CaO = 2.79%, SiO 2 =27.85%) in a completely molten state, grind the additive-CaO to a particle size of about 0.42mm (the addition of the slagging agent CaO meets Add it into the molten pool. After it is completely melted, the molten pool is left to stand for 10 minutes. During this period, the iron ore and additive diCaF 2 , CaO were ground to 0.37mm and mixed evenly, and added to the reduction furnace (wherein the added mass of CaO The following alkalinity relationship should be satisfied:

[0051]

[0052] Additive 2 CaF 2 The mass percentage composition is 12%). Stand still for 20 minutes, so that the components of copper slag, iron ore, and additives are fully coupled. The material in the furnace is in a completely molten state, and the spray gun is inserted into the molten pool to 0.38 times the depth of the molten po...

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Abstract

The invention discloses a method for preparing low-copper molten iron by mixed melting reduction of copper slag and iron ore. The method comprises the following processes of: putting the high-temperature molten copper slag into a reduction furnace, grinding a certain amount of slag forming agent CaO, CaCO3 and the like into certain granularity, adding the ground slag forming agent into the reduction furnace, fully melting the mixture, and standing the molten pool for 10 minutes; grinding the iron ore, quantitative additive CaF2 and CaO into certain granularity respectively, then uniformly mixing the iron ore, the CaF2 and the CaO, adding the mixture into the reduction furnace, raising the temperature of the furnace to between 1,600 and 1,700 DEG C, fully melting the materials in the furnace, and then standing the molten pool for 20 minutes; and crushing a coal reducing agent to certain granularity, spraying the crushed coal reducing agent to the molten pool by using inert gas as carrier gas through a spray gun, and performing mixed melting reduction reaction of the copper slag and the iron ore. The method greatly reduces the defect of high copper in the molten iron obtained by single copper slag melting reduction by fully using the mutual coupling effect of the components among the copper slag, the iron ore and the additive and the diluting effect of the molten iron obtained by iron ore reduction on high copper content of the molten iron obtained by copper slag reduction, and has wide applicability.

Description

technical field [0001] The invention relates to a method for preparing low-copper molten iron by mixing copper slag and iron ore through smelting reduction, and belongs to the field of resources and environment. Background technique [0002] In recent years, China's iron and steel industry has developed rapidly. my country's iron and steel industry occupies a pivotal position in the world's iron and steel industry. For more than ten years, its total iron and steel production has always occupied the first place in the iron and steel industries of all countries in the world. However, my country's iron ore resources are far from meeting the needs of the iron and steel industry, and the distribution of resources has the following characteristics: first, there are many lean ores, and the reserves of lean ores account for 80% of the total reserves; The third is that my country's iron ore resources are scarce, the grade is low, and the production capacity of steel enterprises across...

Claims

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Application Information

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IPC IPC(8): C21B11/00C21B13/00
Inventor 王华李磊胡建杭
Owner KUNMING UNIV OF SCI & TECH
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