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Method of producing high grade magnetic concentrate from sulfuric-acid residue composite pellet

A technology of magnetite concentrate and composite pellets, which is applied in the field of iron and steel metallurgy and can solve the problems of high impurity content, low dosage, and utilization rate of less than 50%.

Inactive Publication Date: 2007-03-07
CENT SOUTH UNIV
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Problems solved by technology

In addition, during the roasting process of pyrite in fluidized bed furnace, iron is oxidized to Fe 2 o 3 , the slag phenomenon on the surface of the particles is serious, so the spheroidization and sintering properties are very poor, and it cannot be directly used in the production of sinter and pellets
In recent years, with the increase of sulfuric acid production, the amount of pyrite slag has increased accordingly, and the annual output of slag is about 30 million tons. The iron grade is low, and the current utilization rate is less than 50%
[0003] Sulfuric acid slag is directly used for sintering or pelletizing, which has the disadvantages of small dosage and many harmful impurities, which seriously affect the technical and economic indicators of sintering or pelletizing production
Conventional beneficiation process produces iron concentrate from sulfuric acid slag, but the iron concentrate has low iron grade and high impurity content, belongs to hematite concentrate, and has poor performance when used in sintering or pellet production

Method used

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  • Method of producing high grade magnetic concentrate from sulfuric-acid residue composite pellet

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Embodiment 1

[0013] Embodiment 1: Additive formula (by weight): coal 70%, ferric chloride 10%, calcium carbonate 10%, sodium humate 10%. Additive dosage is 5%, sulfuric acid slag iron grade is 34%, sulfur content is 1.2%, reduction temperature is 800°C, reduction time is 25min, drum type magnetic separator is selected three times (magnetic field strength 80 millitesla), and magnetite concentrate iron grade is obtained. 62.3%, iron recovery rate 81.3%, sulfur 0.48%, copper 0.11%, lead 0.019%, zinc 0.035%.

Embodiment 2

[0014] Embodiment 2: additive formula is (by weight): coal 70%, ferric chloride 15%, calcium carbonate 15%, sodium humate 5%. The dosage of additives is 5%, the iron grade of sulfuric acid slag is 34%, the sulfur content is 1.2%, the reduction temperature is 800°C, the reduction time is 20min, and the drum magnetic separator is separated three times (the magnetic field strength is 75 millitesla), and the iron grade of the magnetite concentrate is obtained. 62.0%, iron recovery rate 80.1%, sulfur 0.55%, copper 0.11%, lead 0.022%, zinc 0.033%.

Embodiment 3

[0015] Embodiment 3: additive formula is (by weight): coal 80%, iron trichloride 5%, calcium carbonate 5%, sodium humate 10%. Additive dosage is 3%, sulfuric acid slag iron grade is 34%, sulfur content is 1.2%, reduction temperature is 850°C, reduction time is 25min, drum type magnetic separator is selected three times (magnetic field strength 75 millitesla), and magnetite concentrate iron grade is obtained. 62.2%, iron recovery rate 80.8%, sulfur 0.50%, copper 0.13%, lead 0.020%, zinc 0.027%.

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Abstract

The invention discloses a high-grade magnet concentrate preparing method of sulfuric slag composite ball, which is characterized by the following: adopting reducing sintering method; conversing hematite in the sulfuric slag into magnetic ore; dissolving harmful element (Cu, Zi, S) in the salt; rolling sulfur in the non-magnetic phase or easily soluble sulfate; using wet magnetic cobbing technology to enrich iron; removing the harmful element.

Description

[0001] Technical field The present invention belongs to the field of iron and steel metallurgy, and relates to a method for producing high-grade magnetite concentrate by reducing and roasting sulfuric acid slag composite pellets. Background technique [0002] Sulfuric acid slag is a waste residue produced during the production of sulfuric acid. Due to the different composition of pyrite raw material for the preparation of sulfuric acid and the difference in roasting process, the composition and properties of sulfuric acid slag are not the same: first, the iron grade fluctuates greatly, generally 30% to 55%, SiO 2 >10%; the second is that there is unburned sulfur in the sulfuric acid slag, generally above 1%; the third is that some contain a small amount of non-ferrous metals and precious metals. In addition, during the roasting process of pyrite in fluidized bed furnace, iron is oxidized to Fe 2 o 3 , The slag phenomenon on the surface of the particles is serious, so the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00
CPCY02P10/20
Inventor 朱德庆潘建左惠亮楼正洪李建徐小锋王中华周翔李青春李紫云刘洪钧
Owner CENT SOUTH UNIV
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