Direct reduction roasting-magnetic separation red mud comprehensive using method based on rotary kiln

A technology of rotary kiln and red mud, which is applied in the field of comprehensive resource utilization, can solve the problems of environmental pollution, large manpower and material resources for stockpiling red mud, waste of resources, etc., and achieves the advantages of convenient operation and management, comprehensive utilization and high recovery rate Effect

Active Publication Date: 2017-10-17
张建华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most production plants produce 0.8-1.5 tons of red mud for every 1 ton of alumina produced. At present, red mud is mainly stockpiled in different ways. The cumulative stockpiled red mud exceeds 350 million tons, which not only takes up a lot of land, but also affects the environment. It has caused serious pollution, and the management of stockpiled red mud also requires a lot of manpower and material resources. Red mud contains many useful metal elements, which also causes a waste of resources

Method used

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  • Direct reduction roasting-magnetic separation red mud comprehensive using method based on rotary kiln

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition of the red mud used is shown in Table 1.

[0025] Table 1 Main chemical components of red mud used

[0026] Element

Fe

Ai 2 o 3

SiO 2

Na 2 o

CaO

MgO

Cr

Burn out

content

33.20

18.20

12.20

8.19

15.70

0.69

0.29

12.50

[0027] Firstly, batching is carried out, and the mass ratio of batching is: red mud: coal powder: seaside titanium magnetite: modified starch: bentonite: water=100:25:8.5:2.5:4.5:7.5. Among them, the iron grade of seaside titanium magnetite is 54.21%, TiO 2 Content of 9.5%, coal powder is bituminous coal with fixed carbon mass fraction of 57.5%, volatile matter of 26.5%, and ash content of 15.2%. After all the materials are mixed evenly, they are pressed into balls on a ball pressing machine under a pressure of 11.5MPa, and the balls are dried at 230°C for 60 minutes.

[0028] The dried balls were calcined at 1290° C. for 4.5 hours, and the calcine...

Embodiment 2

[0031] The chemical composition of the red mud used is shown in Table 2.

[0032] Table 2 Main chemical components of red mud used

[0033] Element

Fe

Ai 2 o 3

SiO 2

Na 2 o

CaO

MgO

Cr

S

Burn out

content(%)

46.91

7.90

5.01

1.82

0.35

0.09

0.29

0.095

15.80

[0034] Firstly, batching is carried out, and the batching mass ratio is: red mud: coal powder: seaside titanium magnetite: modified starch: bentonite: water = 100:30:9.5:2.5:3.5:8.5. Among them, the iron grade of seaside titanium magnetite is 55.45%, TiO 2 The content is 8.7%, the pulverized coal is bituminous coal with a fixed carbon mass fraction of 57.5%, a volatile matter of 12.3%, and an ash content of 21.2%. After all the materials are mixed evenly, they are pressed into balls on a ball pressing machine under a pressure of 11.5MPa, and the balls are dried at 230°C for 60 minutes.

[0035] The dried balls were calcined at 1285° C...

Embodiment 3

[0038] The chemical composition of the red mud used is shown in Table 3.

[0039] Table 3 Main chemical components of red mud used

[0040] Element

Fe

Ai 2 o 3

SiO 2

Na 2 o

CaO

MgO

Cr

S

Burn out

content(%)

35.28

12.54

11.15

5.60

7.56

1.56

0.29

0.095

10.80

[0041] Firstly, batching is carried out, and the batching mass ratio is: red mud: coal powder: seaside titanium magnetite: modified starch: bentonite: water = 100:27:10.0:2.5:3.5:9. Among them, the iron grade of seashore titanium magnetite is 54.87%, TiO 2 Content of 9.0%, coal powder is bituminous coal with fixed carbon mass fraction of 55.7%, volatile matter of 18.3%, and ash content of 24.8%. After all the materials are mixed evenly, they are pressed into balls on a ball pressing machine under a pressure of 11.5MPa, and the balls are dried at 230°C for 60 minutes.

[0042] The dried balls were calcined at 1300° C. for 4.8 hours, ...

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Abstract

The invention provides a direct reduction roasting-magnetic separation red mud comprehensive using method based on a rotary kiln, and belongs to the technical field of resource comprehensive using. According to the method, red mud serves as a raw material, coal powder is a reducing agent, titanomagnetite is an addition agent, starch and bentonite are binder for conducting ball pressing, iron is recovered by adopting a direct reduction roasting-magnetic separation technology, amendment is added into tailings after the iron is recovered for adjusting ingredients, and then, after cement is added, different kinds of building materials are produced. The method has the advantages that the red mud can be fully used, after the red mud and titanomagnetite are mixed, reduction roasting is conducted, the titanomagnetite can improve conducting of the reducing process, meanwhile, the low-cost coal is used as the reducing agent, after the tailings obtained from magnetic separation are conditioned, the building materials can be produced, finally, direct reduction iron blocks with iron grade of more than 92% are obtained, the recovery rate of the iron is normally higher than 85%, and other ingredients meet the requirements of direct steelmaking.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of resources, in particular to a method for comprehensive utilization of red mud based on rotary kiln direct reduction roasting-magnetic separation. Background technique [0002] Red mud is a very fine-grained strong alkaline solid waste produced during the production of alumina from bauxite. It is red because it contains a large amount of iron oxide, so it is called red mud. The output of red mud depends on the ore Taste, production method, technical level vary. Most production plants produce 0.8-1.5 tons of red mud for every 1 ton of alumina produced. At present, red mud is mainly stockpiled in different ways. The accumulated stockpiled red mud exceeds 350 million tons, which not only takes up a lot of land, but also affects the environment. It has caused serious pollution, and the management of the stockpiled red mud also requires a lot of manpower and material resources. Red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/242C21B13/08B02C23/08B03C1/02C04B28/00C04B18/14
CPCB02C23/08B03C1/02C04B18/14C04B28/00C21B13/008C21B13/08C22B1/02C22B1/242C04B22/00C04B40/024Y02P10/143Y02W30/91
Inventor 张建华孙体昌
Owner 张建华
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