Process for preparing clay firebrick by flotation tailing of bauxite

A technology for flotation tailings and bauxite, which is applied in the field of preparing clay refractory bricks from bauxite flotation tailings, can solve the problems of difficult engineering, difficult iron recovery, environmental pollution, etc., and achieves environmentally friendly, good Economic benefits and mild treatment conditions

Inactive Publication Date: 2008-11-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Inorganic acid has a high extraction rate of iron minerals in bauxite, but there are problems such as high cost, difficulty in iron recovery and environmental pollution, making it difficult to realize engineering

Method used

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  • Process for preparing clay firebrick by flotation tailing of bauxite
  • Process for preparing clay firebrick by flotation tailing of bauxite
  • Process for preparing clay firebrick by flotation tailing of bauxite

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Oxalic acid method to remove iron minerals in beneficiation tailings

[0026] Adding solid oxalic acid to the tailings slurry, adding water to make the concentration of oxalic acid 10%, stirring and leaching at 85° C. for 0.5 h; filtering to obtain iron-removing tailings and filtrate. The comparison of element content before and after tailings leaching is shown in Table 1.

[0027] Table 1 Comparison of chemical element content (%) before and after tailings leaching

[0028] Al 2 o 3

SiO 2

Fe 2 o 3

TiO 2

K 2 o

Na 2 o

MgO

CaO

Before leaching

43.278

28.895

10.33

3.130

4.221

0.234

0.389

0.159

After leaching

46.263

31.265

1.44

3.521

4.607

0.244

0.340

0.040

[0029] (2) Photocatalytic preparation of ferrous oxalate and recovery of oxalic acid

[0030] The filtrate obtained in step 1 is left standing ...

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Abstract

A method for the treatment of bauxite flotation tailings relates to a method for making clay fire brick by means of bauxite flotation tailings and reclaiming the iron mineral in the tailings to make ferrous oxalate and ferric oxide. The method is characterized in that: firstly, the making process adopts oxalic acid leach bauxite cradling tailings iron mineral so as to remove iron; then, tailings is filtered and separated to make clay fire bricks. The method removes most impurity iron in the tailings at first so as to ensure that the content of ferric oxide in the tailings drops to less than 1.5 percent; meanwhile, only less than 1 percent of aluminum is leached out, and the crystal structure of the aluminum mineral in the tailings is not damaged basically; moreover, the flotation tailings with iron removed can be used to make qualified clay fire bricks.

Description

technical field [0001] A treatment method for bauxite flotation tailings relates to a method for preparing clay refractory bricks by using bauxite flotation tailings and recovering iron minerals in the tailings to prepare ferrous oxalate and iron oxide. Background technique [0002] In recent years, with the continuous and rapid growth of alumina production, the consumption of bauxite has increased rapidly, especially the reserves of high-grade bauxite have declined sharply. To solve the problem of shortage of high-grade bauxite resources, make full use of low-grade bauxite Mineral resources, "Ore dressing ~ Bayer process to produce alumina" has been applied. Mineral dressing ~ Bayer method solves the problem of insufficient reserves of high-grade bauxite and expands the amount of resources for alumina production. However, tailings, which account for about 20% of the processed ore, will be generated during the beneficiation process. With the expansion of bauxite beneficiati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李军亮周吉奎赵卓
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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