Comprehensive utilization method of red mud

A technology for red mud and red mud slag, applied in separation methods, chemical instruments and methods, cement production, etc., can solve problems such as seldom research, and achieve the effects of low firing temperature, saving desulfurizer costs, and less heat consumption

Active Publication Date: 2017-06-23
河南恒信检测研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are a lot of research on the comprehensive reuse of red mud at home and abroad, the direction is mainly concentrated on the extraction of iron oxide from red mud, the preparation of slag red mud cement, sulphoaluminate cement, road portland cement, red mud

Method used

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  • Comprehensive utilization method of red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Preparation of red mud-calcium dealkalization agent mixed pulp:

[0030] Inject the sintered red mud and calcium oxide (calcium dealkalization agent) into the red mud-calcium dealkalizer mixed slurry preparation tank according to the composition ratio of 85:15, install stirring devices at both ends of the preparation tank, add water and stir Uniform, prepared into a red mud-calcium dealkalization agent mixed slurry with a liquid-solid ratio of 9:1 (kg / kg);

[0031] b. Desulfurization of red mud-calcium dealkalization agent mixed pulp:

[0032] Import the red mud-calcium dealkalization agent mixed slurry made in step a into the storage tank, and use the slurry circulation pump to send the red mud-calcium dealkalization agent mixed slurry in the storage tank to the top of the desulfurization tower and pass through the top of the tower The spraying device is sprayed into the desulfurization tower, and the SO 2 Flue gas (sulfur dioxide content is 1600mg / Nm 3 ) enters ...

Embodiment 2

[0039] The steps are basically the same as in Example 1, the difference is that:

[0040] In step a: the calcium dealkalization agent used is calcium carbonate, the red mud used is Bayer red mud, and in the preparation of red mud-calcium dealkalizer mixed slurry, the component ratio of red mud and calcium carbonate is 90: 10; The liquid-solid ratio of red mud-calcium dealkalization agent mixed slurry is 7:1;

[0041] In step b: in the process of flue gas desulfurization, the red mud-calcium dealkalization agent mixed slurry is mixed with SO-containing 2 The liquid-gas ratio of flue gas is 16:1 (L / m 3 ). SO before desulfurization 2 The sulfur dioxide content in the flue gas is 1700mg / Nm 3 , SO after desulfurization 2 The sulfur dioxide content in the flue gas is 89mg / Nm 3 .

[0042] In step d, take 48.7% of desulfurization red mud slag, 43% of limestone, 6% of sandstone, and 2.3% of fly ash according to the mass, mix them evenly, and put them in a pulverizer to grind unt...

Embodiment 3

[0045] The steps are basically the same as in Example 1, the difference is that:

[0046] In step a: the calcium dekalization agent used is calcium hydroxide, the red mud used is a combined process red mud, and in the preparation of red mud-calcium dekalization agent mixed slurry, the composition ratio of red mud and calcium hydroxide is 95:5; the liquid-solid ratio of red mud-calcium dealkalization agent mixed slurry is 5:1;

[0047] In step b: in the flue gas desulfurization process, the red mud-calcium dealkalization agent mixed slurry with a liquid-solid ratio of 5:1 and SO2-containing 2 The liquid-to-gas ratio of the flue gas is 12:1 (L / m 3 ). SO before desulfurization 2 The sulfur dioxide content in the flue gas is 1800mg / Nm 3 , SO after desulfurization 2 The sulfur dioxide content in the flue gas is 97mg / Nm 3 .

[0048] In step d, 50.1% of desulfurization red mud residue, 41% of limestone, 6% of sandstone, and 2.9% of fly ash were taken by mass, mixed evenly, and...

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Abstract

The invention discloses a comprehensive utilization method of red mud, comprising the following steps: mixing the red mud and calcareous dealkalize agent; adding water and mixing to prepare red mud-calcareous dealkalize agent mixed slurry, wherein the red mud-calcareous dealkalize agent mixed slurry is in countercurrent contact with sulfur-containing flue gas in a tower to absorb sulfur dioxide; discharging desulfurized flue gas from the top of the tower; discharging red mud mixed slurry from the bottom of the tower; and continuing to process the red mud mixed slurry to prepare ordinary silicate cement. The comprehensive utilization method of the red mud disclosed by the invention has a plurality of benefits such as utilization of industrial waste residue, high-efficiency flue gas desulfurization, high-efficiency red mud dealkalization, recycled utilization and the like.

Description

technical field [0001] The invention relates to the field of industrial waste recycling, in particular to a method for comprehensive utilization of red mud. Background technique [0002] The characteristics of my country's abundant coal reserves and resource structure determine that coal is the main production method, and the resulting sulfur dioxide and acid rain pollution have seriously affected the normal life of residents, agricultural production and housing construction. Therefore, reducing SO in flue gas 2 Controlling the pollution of sulfur dioxide is one of the most urgent tasks in the field of atmospheric environmental governance in China. [0003] At present, there are many studies on flue gas desulfurization technology, as listed in Table 1: [0004] Table 1 Existing flue gas desulfurization technologies [0005] [0006] A large amount of red mud will be produced in the tailings of the alumina industry, and for every 1 ton of alumina produced, 0.8-1.5 tons ...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/36C04B7/38B01D53/50B01D53/80
CPCB01D53/502B01D2251/404B01D2258/0283B01D2259/126C04B7/26C04B7/36C04B7/38Y02P40/10
Inventor 罗忠涛刘垒张美香王亚洲李佳
Owner 河南恒信检测研究院有限公司
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