Method for producing converter coolant by Bayer red mud

A Bayer process red mud and coolant technology, applied in the manufacture of converters and other directions, can solve the problems of dust pollution, land occupation, damage to the ecological environment, etc., and achieve the effects of environmental protection, cost reduction and huge economic benefits

Active Publication Date: 2013-10-16
武汉振海科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alumina plants in various parts of my country generally use the method of building platforms on flat ground to stockpile red mud. Because no protective measures are taken, free alkali and other harmful components in red mud pollute the groundwat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] As shown in Table 4, the basic composition of Bayer process red mud in an alumina plant includes: 38.28% Fe 2 o 3 , 28.56% SiO2 2 , 16.12% Al 2 o 3 , 1.25% CaO, 9.72% Na 2 O, 3.45% TiO 2 , not included in burn reduction.

[0041] Table 4: Basic components of Bayer process red mud in Example 1 (ignition loss is not included)

[0042] name

Fe 2 o 3

SiO 2

al 2 o 3

CaO

Na 2 o

TiO 2

Element%

38.28

28.56

16.12

1.25

9.72

3.45

[0043] There are two 120-ton converters in a steel factory, all of which used sinter as coolant in the past. After technical exchanges with steel mills, combined with smelting steel types and processes, and the composition of the above-mentioned alumina plant red mud, several key indicators for replacing the original coolant were jointly determined. The requirements are: Fe 2 o 3 The content of CaO ≥ 45%, the content of CaO ≤ 0.5%, H 2 O content ≤ 5%.

[004...

Embodiment 2

[0057] As shown in Table 7, the basic composition of Bayer process red mud in an alumina plant includes: 39.26% Fe 2 o 3 , 25.50% SiO 2 , 15.12% Al 2 o 3 , 2.15% CaO, 8.36% Na 2 O, 3.85% TiO 2 , not included in burn reduction.

[0058] Table 7: Basic components of Bayer process red mud in Example 2 (ignition loss is not included)

[0059] name

Fe 2 o 3

SiO 2

al 2 o 3

CaO

Na 2 o

TiO 2

Element%

39.26

25.50

15.12

2.15

8.36

3.85

[0060] There are two 70-ton converters in a steel factory, all of which used iron ore as coolant in the past. After technical exchanges with steel mills, combined with smelting steel types and processes, and the composition of the above-mentioned alumina plant red mud, several key indicators for replacing the original coolant were jointly determined. The requirements are: Fe 2 o 3 content ≥ 50%, SiO 2 content of ≤10%, H 2 O content 4%.

[0061] According to ...

Embodiment 3

[0074] As shown in Table 10, the basic composition of Bayer process red mud in an alumina plant includes: 30.55% Fe 2 o 3 , 25.56% SiO 2 , 17.12% Al 2 o 3 , 6.25% CaO, 6.85% Na 2 O, 3.48% TiO 2 , not included in burn reduction.

[0075] Table 10: Basic components of Bayer process red mud in Example 3 (ignition loss is not included)

[0076] name

Fe 2 o 3

SiO 2

al 2 o 3

CaO

Na 2 o

TiO 2

Element%

30.55

25.56

17.12

6.25

6.85

3.48

[0077] There are two 40-ton converters in a steel factory, all of which used sinter as coolant in the past. After technical exchanges with steel mills, combined with smelting steel types and processes, and the composition of the above-mentioned alumina plant red mud, several key indicators for replacing the original coolant were jointly determined. The requirements are: Fe 2 o 3 content ≥ 50%, H 2 O content ≤ 3%.

[0078] According to the above requirements...

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Abstract

The invention discloses a method for producing converter coolant by Bayer red mud, and relates to the field of converter steelmaking. The method comprises steps of preparing Bayer red mud by using 30-40% of Fe2O3, 25-30% of SiO, 10-20% of Al2O3, 1-7% of CaO, 5-10% of Na2O and 2-5% of TiO in percentage by weight; carrying out wet magnetic separation on the Bayer red mud, to obtain 45-75% of Fe2O3, 5-15% of SiO2, 6-16% of Al2O3, 0.2-5% of CaO, 3-10% of Na2O and 1-3% of TiO2; filter-pressing the red mud after the magnetic separation to obtain 5-8% of water, adding 4-6% of water glass and 0.5-1% of sodium fluosilicate, mixing and shaping in a ball press machine, and drying until water content is 2-4%, thus obtaining the converter coolant. The converter coolant prepared by the method is high in cooling efficiency, free from smelting time occupation, convenient to regulate temperature, low in production cost, uniform in granularity, good in ball press effect, high in strength and small in dust; the converter coolant protects environment and saves resource.

Description

technical field [0001] The invention relates to the field of converter steelmaking, in particular to a method for producing converter coolant from Bayer process red mud. Background technique [0002] Oxygen top-blown converters generally use pure oxygen blowing, which will generate a large amount of excess heat during the steelmaking process, so a certain amount of coolant needs to be added to accurately control the end point temperature within the range of tapping temperature. At present, steel scrap, iron ore or pellets (also known as sinter) are generally used as coolants. However, scrap steel is not only expensive, but also requires special feeding equipment, otherwise it will increase the feeding time and it is inconvenient to adjust during the blowing process. temperature; iron ore is easily brought into the gangue, increasing lime consumption and slag volume; pellets have a high oxygen content, and are easy to float on the liquid surface after being added, and may cau...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 张启宇张东峰张可会周娴
Owner 武汉振海科技有限公司
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