Mixed treatment method of Bayer process red mud and converter OG mud

A Bayer method red mud and mixed treatment technology, which is applied in the field of metallurgy and mineral engineering, can solve problems such as environmental impact and waste of resource stockpiling, and achieve the effects of low price, reduced stockpiling costs, and easy availability of raw and auxiliary materials

Pending Publication Date: 2022-07-22
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a mixed treatment method of Bayer process red mud and converter OG mud, so as to solve the problem of resource stockpiling waste and environmental impact of the red mud and OG mud at present

Method used

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  • Mixed treatment method of Bayer process red mud and converter OG mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Bayer process red mud TFe (total iron): 27.2%; Al 2 O 3 : 18.3%; CaO: 8.5%; SiO 2 %: 7.5%;

[0039] Converter OG mud TFe: 59.3%; CaO: 11.8%; SiO 2 %: 2.5%;

[0040] After the Bayer process red mud and converter OG mud are dried, crushed and milled respectively, they are mixed and pelletized (10~20mm) according to the mass ratio of 43:57, and then the mixed pellets and blue carbon are added to the rotary kiln Reduction roasting is carried out at the discharge end, during which high-volatile lignite is injected into the rotary kiln using a pelletized coal spray gun as fuel and reducing agent, wherein the mass ratio of mixed pellets: blue carbon: lignite is 100:16:28. The roasting temperature for direct reduction in the rotary kiln is 1200℃, the time in the kiln is 3 hours, and the temperature of the material discharged from the kiln is 1050℃. The metallized material discharged from the discharge end of the rotary kiln contains 53.1% iron and 6.3% carbon. The metalliz...

Embodiment 2

[0042] Bayer process red mud TFe: 32.5%; Al 2 O 3 : 16.3%; CaO: 6.5%; SiO 2 %: 8.5%;

[0043] Converter OG mud TFe: 57.8%; CaO: 13.2%; SiO 2 %: 3.1%;

[0044]After the Bayer process red mud and converter OG mud are dried, crushed and milled respectively, they are mixed and pelletized (10~20mm) according to the mass ratio of 50:50, and then the mixed pellets and blue carbon are added to the rotary kiln Reduction roasting is carried out at the discharge end, during which high-volatile lignite is injected into the rotary kiln with a pellet coal spray gun as fuel and reducing agent, wherein the mass ratio of mixed pellets: blue carbon: lignite is 100:17:25. The roasting temperature for direct reduction in the rotary kiln is 1175°C, the time in the kiln is 3 hours and 15 minutes, and the temperature of the material at the outlet of the kiln is 980°C. The metallized material discharged from the discharge end of the rotary kiln contains 52.3% iron and 7.8% carbon. Then, the meta...

Embodiment 3

[0046] Bayer process red mud TFe: 37.3%; Al 2 O 3 : 13.3%; CaO: 4.5%; SiO 2 %: 5.5%;

[0047] Converter OG mud TFe: 56.2%; CaO: 15.8%; SiO 2 %: 3.5%;

[0048] After the Bayer process red mud and converter OG mud are dried, crushed and milled respectively, they are mixed and pelletized (10~20mm) according to the mass ratio of 58:42, and then the mixed pellets and blue carbon are added to the rotary kiln Reduction roasting is carried out at the discharge end, during which high-volatile lignite is injected into the rotary kiln using a pelletized coal spray gun as fuel and reducing agent, wherein the mass ratio of mixed pellets: blue carbon: lignite is 100:18:22. The roasting temperature for direct reduction in the rotary kiln is 1150℃, the time in the kiln is 3 hours and 30 minutes, and the temperature of the material at the outlet of the kiln is 960℃. The metallized material discharged from the discharge end of the rotary kiln contains 51.5% iron and 9.1% carbon. Then, the ...

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Abstract

The invention discloses a Bayer process red mud and converter OG mud mixing treatment method, which comprises the following steps: respectively drying, crushing and wet-grinding Bayer process red mud and converter OG mud, proportioning, mixing and pelletizing, using high volatile lignite as a fuel and a reducing agent source, and carrying out direct reduction roasting in a rotary kiln to obtain the Bayer process red mud and converter OG mud. The whole technological process is subjected to hot charging and hot conveying, energy conservation and emission reduction are achieved, flue gas heat energy is used for drying the red mud and the OG mud, resource utilization of the Bayer process red mud and the OG mud in the converter is greatly achieved, benefits are tropied, harm is avoided, and the method is suitable for industrial production. Meanwhile, the stockpiling cost of the red mud and the OG mud and the influence pressure on the environment are reduced. The technological process is simple, raw materials and auxiliary materials are easy to obtain, and particularly the semi-coke and the high-volatile lignite are low in price.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and relates to a mixed treatment method of Bayer process red mud and converter OG mud. Background technique [0002] The world's bauxite is mainly divided into gibbsite ore and gibbsite ore. The gibbsite ore is suitable for sintering or series smelting, and the gibbsite ore is suitable for Bayer smelting. The red mud produced by gibbsite smelting has low content of iron and aluminum and high content of silicon, while the red mud produced by Bayer smelting of gibbsite ore has high content of iron and aluminum, and low content of silicon, which is suitable for extracting metal resources. possible. The Bayer process used in gibbsite-type bauxite smelting involves the dissolution reaction of gibbsite ore with NaOH solution to make Al 2 O 3 Converted into sodium aluminate solution, and then crystallized and calcined to obtain Al 2 O 3 , while the remaining Al 2 O 3 , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02C22B5/10C21B13/08C21B13/14
CPCC22B1/2406C22B1/02C22B5/10C21B13/0066C21B13/0006C21B13/08C21B13/14
Inventor 余煌鸣王明华雷鹏飞权芳民寇明月王建平张红军张小兵陈得贵
Owner JIUQUAN IRON & STEEL GRP
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