Method for preparing copper-bearing iron powder by synergetic reduction and magnetic separation of high-iron copper slag and high-iron manganese ore

A high-iron manganese ore and high-iron technology, applied in the field of resource utilization of industrial waste slag, can solve the problems of high environmental pollution in the coking process, difficulty in separating iron and manganese, and difficult dissociation of gangue minerals, so as to speed up the reduction reaction rate and improve the magnetic field. The effect of selecting metal recovery rate and high clay content

Active Publication Date: 2019-07-05
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] At the same time, high-iron manganese ore is another common low-grade complex iron ore resource. Due to the similar properties of iron and manganese, iron and manganese in the ore often co-exist closely. It is difficult to separate iron and manganese by conventional beneficiation processes. The 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...

Method used

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  • Method for preparing copper-bearing iron powder by synergetic reduction and magnetic separation of high-iron copper slag and high-iron manganese ore
  • Method for preparing copper-bearing iron powder by synergetic reduction and magnetic separation of high-iron copper slag and high-iron manganese ore

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Experimental program
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Effect test

Embodiment 1

[0044] The high-iron copper slag 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 ​​1630cm 2 / g; high-iron manganese ore is processed through ball milling and high-pressure roller milling until more than 75% of the particles have a particle size of less than 0.074mm and a specific surface area of ​​1530cm 2 / g; then with high iron copper slag and high iron manganese ore ratio 5:5, compound additive dosage 10% (limestone 80wt%+sodium humate 20wt%), under the condition of pelletizing moisture 8%, pelletizing time 12min, obtained raw The compressive strength of the ball is 11N / piece, the drop strength is 5.5N / piece, and the burst temperature is 380°C. The green ball index meets or even exceeds the industrial requirements.

Embodiment 2

[0046] The high-iron copper slag 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 ​​1630cm 2 / g; the high-iron manganese ore is combined with ball milling and high-pressure roller milling until more than 75% of the particle size is less than 0.074mm, and the specific surface area is 1530cm2 / g; then the ratio of high-iron copper slag to high-iron manganese ore is 4:6, and the amount of composite additives is 10%. (limestone 80wt% + sodium humate 20wt%), pelletizing moisture 8%, pelletizing time 15min, the obtained green pellets have a compressive strength of 13.3N / piece, a drop strength of 6.7N / piece, and a burst temperature of 420°C.

[0047] Comparing Examples 1-2 with Comparative Examples 2-3, it can be seen that the strength and bursting temperature of the obtained green pellets are significantly improved by adding ferromanganese ore, which shows that f...

Embodiment 3

[0053] The high-iron copper slag is treated by ball milling and high-pressure roller milling until more than 80% of the particles have a particle size of less than 0.074mm, and the specific surface area is 1630cm2 / g; the high-iron manganese ore is treated by ball milling and high-pressure roller milling until more than 75% of the particles mm, the specific surface area is 1530cm2 / g; mix high-iron copper slag and high-iron manganese ore according to 4:6, and add 15% additives (limestone 80wt% + sodium humate 20wt%), and use a disc pelletizer to pelletize the mixture , control the water content of the pellets to 7% to 9%, and the pelletizing time is 12 minutes. After the green pellets are dried, they enter the rotary kiln, add reduced coal in the rotary kiln at a C / Fe mass ratio of 0.8, and reduce at 1250°C for 80 minutes to obtain reduction product; grind the reduced product until the fineness of more than 90% of the particles in the reduced product is less than 0.074mm; finally...

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Abstract

The invention discloses a method for preparing copper-bearing iron powder by synergetic reduction and magnetic separation of high-iron copper slag and high-iron manganese ore, and belongs to the technical field of industrial waste slag resource utilization. The method for preparing the copper-bearing iron powder by synergetic reduction and magnetic separation of the high-iron copper slag and the high-iron manganese ore includes the following steps that S1, the high-iron copper slag, the high-iron manganese ore and a composite addition agent are mixed, and pelletizing is conducted to obtain green balls; S2, the green balls are dried and then enter a rotary kiln, reduction coal is added to restore, and thus reduction products are obtained; S3, ore grinding and magnetic separation are conducted on the reduction products to obtain the copper-bearing iron powder; and the composite addition agent is prepared from the components in percentage by mass: 70-90% of limestone and 10-30% of sodiumhumate. According to the method for preparing the copper-bearing iron powder by synergetic reduction and magnetic separation of the high-iron copper slag and the high-iron manganese ore, MnO2 in the high-iron manganese ore is used for participating in the reduction reaction of fayalite and copper sulphide, gibbs free energy of reduction of the fayalite and the copper sulphide is lowered, the reduction reaction is catalyzed, the reduction reaction rate is accelerated, the reduction reaction is facilitated, and thus the metallization ratio and the magnetic separation metal recovery of iron and copper are improved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial waste slag, and in particular relates to a method for preparing copper-containing iron powder through synergistic reduction-magnetic separation of high-iron copper slag and high-iron manganese ore. Background technique [0002] A large number of studies in recent years have shown that copper, as an alloying element, can be added to steel in an appropriate amount, which can not only effectively improve the strength and impact toughness of steel, but also enhance its corrosion resistance and antibacterial properties! Improve steel quality. Based on this, copper-containing special steels (copper-containing weathering steel, copper-containing high-strength steel, and copper-containing antibacterial stainless steel) have developed rapidly and are widely used in railways, towers, photovoltaics, high-speed engineering, vehicles, bridges, containers, etc. Steel structures used ...

Claims

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Application Information

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IPC IPC(8): C21B13/08C21B13/14C22B1/248C22B7/04C22B15/00
CPCC21B13/0066C21B13/08C21B13/14C22B1/2406C22B1/248C22B7/001C22B7/04C22B15/0054Y02P10/20
Inventor 郭正启朱德庆潘建李启厚李紫云梁钟仁李思唯薛钰霄
Owner CENT SOUTH UNIV
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