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A method for recovering iron, copper and manganese through co-reduction of copper smelting slag and ferromanganese ore

A technology of copper smelting slag and ferromanganese ore, which is applied in the field of co-reduction of copper smelting slag and ferromanganese ore to recover iron, copper and manganese, can solve the problems of less than 1% iron utilization rate and large environmental pollution of coking process, and achieve improvement Effects of improving slag fluidity, improving reduction kinetic conditions, and improving green pellet quality

Active Publication Date: 2020-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copper utilization rate of copper smelting slag does not exceed 12%, while the iron utilization rate is less than 1%
At present, the more effective method is to use it as a blast furnace charge to produce manganese-rich slag. However, the blast furnace manganese-rich slag process requires coke as fuel and reducing agent. Process environmental pollution is large

Method used

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  • A method for recovering iron, copper and manganese through co-reduction of copper smelting slag and ferromanganese ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The copper slag is treated by ball milling and high-pressure roller milling until more than 85% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1630cm 2 / g; the iron-manganese ore is combined with ball milling and high-pressure roller milling until more than 80% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1530cm 2 / g; mix the copper slag and the iron-manganese ore at a ratio of 4:6, and add 15% additives (limestone 70wt% + sodium humate 30wt%), use a disc pelletizer to pellet the mixture, and control the pelletizing moisture to 7.5% , the ball making time was 13min, the drop strength of the obtained green balls was 5.3 times / 0.5m, the compressive strength of the green balls was 11.4N / piece, and the green ball burst temperature was 315°C; After drying at 300°C for 6 minutes and preheating at 1100°C for 14 minutes, the compressive strength of the preheated pellets is 750N / piece; th...

Embodiment 2

[0061] The copper slag is treated by ball milling and high-pressure roller milling until more than 85% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1630cm 2 / g; the iron-manganese ore is combined with ball milling and high-pressure roller milling until more than 80% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1530cm 2 / g; mix the copper slag and iron-manganese ore at a ratio of 5:5, and add 15% additives (limestone 70wt% + sodium humate 30wt%), use a disc pelletizer to pellet the mixture, and control the pelletizing moisture to 7.5% , the ball making time was 12min, the drop strength of the obtained green balls was 5.5 times / 0.5m, the compressive strength of the green balls was 11.9N / piece, and the green ball burst temperature was 355°C; After drying at 350°C for 5 minutes and preheating at 1100°C for 13 minutes, the compressive strength of the preheated pellets is 825N / piece; the ho...

Embodiment 3

[0066] The copper slag is treated by ball milling and high-pressure roller milling until more than 85% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1630cm 2 / g; the iron-manganese ore is combined with ball milling and high-pressure roller milling until more than 80% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1530cm 2 / g; mix the copper slag and iron-manganese ore at a ratio of 5:5, add 25% additives (limestone 80wt% + sodium humate 20wt%), use a disc pelletizer to pellet the mixture, and control the pelletizing moisture to 7.5% , the ball making time was 14min, the drop strength of the obtained green balls was 5.8 times / 0.5m, the compressive strength of the green balls was 12.7N / piece, and the green ball burst temperature was 375°C; After drying at 350°C for 6 minutes and preheating at 1100°C for 15 minutes, the compressive strength of the preheated pellets is 875N / piece; the hot pr...

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Abstract

The invention discloses a method for recovering iron, copper and manganese by coreduction of copper smelting slag and ferrous manganese ore. The method includes the steps that (1) pelletizing is carried out, specifically, the copper smelting slag, the ferrous manganese ore, and a composite additive are evenly mixed and then pelletized, wherein the composite additive is prepared from 60% to 80% oflimestone and 20% to 40% of sodium humate; (2) preheating is carried out, specifically, a green-ball is dried and preheated, and a preheated pellet with high strength is obtained; (3) prereduction iscarried out, specifically, a reducing agent is added into the preheated pellet, and a reduction reaction is conducted at 950 to 1050 DEG C; (4) melting and separating are carried out, specifically, the fiery pre-reduced pellet and the reducing agent with the suitable proportion are mixed and fed into a submerged arc furnace to be melted and separated, thus slag iron is separated and cooled, and copper-containing molten iron and manganese slag are obtained; and (5) leaching is carried out, specifically, MnO is leached from the manganese rich slag after crushing and ore grinding and then throughalkali leaching and acid leaching. According to the method, as for the obtained water-containing molten iron, the iron grade is higher than 95%, the copper grade is higher than 1.2%, the recovery rate of the iron exceeds 97%, the recovery rate of the copper exceeds 90%, the leaching rate of the manganese exceeds 90%, and the iron, the copper and the manganese are efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial waste residues, and in particular relates to a method for recovering iron, copper and manganese by co-reduction of copper smelting slag and manganese iron ore. Background technique [0002] The characteristics of my country's iron ore, copper ore and manganese ore resources are poor, fine and miscellaneous, which has led to a very prominent contradiction between the supply and demand of iron, copper and manganese in China, and the high dependence on foreign high-quality ore resources, which is extremely unfavorable to the healthy and stable development of the national economy. . At the same time, the high-quality ore resources in the world are increasingly consumed, and the amount of resources is constantly decreasing. How to effectively develop and utilize low-grade complex ore resources will be one of the basic means to solve the bottleneck of iron, copper and manganese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248C22B7/04C22B15/00C22B47/00C21B13/08
CPCC21B13/0006C21B13/08C22B1/2406C22B1/248C22B7/001C22B7/007C22B7/008C22B7/04C22B15/0052C22B47/00Y02P10/20
Inventor 郭正启朱德庆潘建李启厚李紫云梁钟仁杨聪聪李思唯王定政
Owner CENT SOUTH UNIV
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