A kind of red mud pellet and preparation method thereof

A technology of red mud and pellets, which is applied in the field of red mud treatment in alumina production, can solve the problems of small particle size and inability to directly add and use, and achieve the effects of easy operation, elimination of impact and hidden dangers of accidents, and good smelting performance

Active Publication Date: 2016-01-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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AI Technical Summary

Problems solved by technology

The current method of ironmaking is mainly the fire method, and the dry red mud is powdery, and its particle size is very small, so it cannot be directly added and used. Therefore, how to solve the direct use of red mud has become a subject that must be studied

Method used

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  • A kind of red mud pellet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Red mud 800g;

[0031] Coal powder 30g;

[0032] Organic adhesive 2g;

[0033] 150g of water.

[0034] The organic binder is cassava flour.

[0035] The preparation method of the red mud pellets includes the following steps: crushing the red mud, then adding coal powder and a binder, gradually adding water during the stirring process, further stirring and mixing evenly, and kneading in a kneading machine, Then it is pressed into balls by pair of rollers, and finally baked at 180°C for 3 hours.

[0036] The prepared red mud pellets are oval in shape, 3 cm long, 1 cm thick, and have a compressive strength of 0.25 kN.

[0037] Produce 100 tons of red mud pellets according to the above formula and method, and mix them with iron ore in a ratio of 1:3 for ironmaking, and the Fe content of iron ore 2 o 3 The percentage content of the red mud is 81.05%, and the Fe in the red mud 2 o 3 The percentage composition is 35.6%, obtains pig iron 200.18 tons, and pig iron iron c...

Embodiment 2

[0039] Red mud 1200g;

[0040] Coal powder 100g;

[0041] Inorganic adhesive 50g;

[0042] water 200g

[0043] The inorganic binder is slaked lime.

[0044] The preparation method of the red mud pellets includes the following steps: crushing the red mud, then adding coal powder and a binder, gradually adding water during the stirring process, further stirring and mixing evenly, and kneading in a kneading machine, It is then pressed into balls by pair of rollers, and finally baked at 300°C for 4 hours to obtain the product.

[0045] The prepared red mud pellets are oval in shape, 5 cm long, 2 cm thick, and have a compressive strength of 4 kN.

[0046] Produce 100 tons of red mud pellets according to the above formula and method, and mix them with iron ore in a ratio of 1:3 for ironmaking, and the Fe content of iron ore 2 o 3 The percentage content of the red mud is 81.05%, and the Fe in the red mud 2 o 3 The percentage composition is 35.6%, obtains pig iron 178.2 tons, ...

Embodiment 3

[0048] red mud 1000;

[0049] Coal powder 50;

[0050] Organic adhesive 10g;

[0051] 180g of water.

[0052] The inorganic binder is sodium silicate.

[0053] The preparation method of the red mud pellets comprises the following steps: crushing the red mud, then adding coal powder and a binder, gradually adding water during the stirring process, further stirring and mixing evenly, and kneading in a kneading machine, Then it is pressed into balls by pair of rollers, and finally baked at 240°C for 3.5 hours.

[0054] The prepared red mud pellets are oval in shape, 4 cm long, 1.5 cm thick, and have a compressive strength of 2 kN.

[0055] According to the above formula and method, 500 tons of red mud pellets are produced, and the pellets are used for ironmaking, and the Fe content of red mud 2 o 3 The percentage composition is 35.6%, and 183.61 tons of pig iron are obtained, and the pig iron iron content is 93.88%, and the iron recovery rate is: 96.84%, and the pig iron qu...

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Abstract

The invention provides red mud pellets and a preparation method thereof. The red mud pellets are prepared from the following raw materials in parts by weight: 80-120 parts of red mud, 3-10 parts of coal powder, 0.2-1 part of organic adhesive or 5-20 parts of inorganic adhesive, and 15-20 parts of water. The preparation method comprises the following steps: crushing the red mud, adding the coal powder and adhesive, gradually adding water in the stirring process, uniformly mixing, kneading in a kneading machine, extruding into pellets through pair rollers, and finally, drying the red mud pellets. The method has the advantages of simple technique and feasible operation, implements comprehensive utilization of red mud, reduces the associated cost of red mud stacking, and eliminates the influence and accident potential on the environment due to red mud stacking.

Description

technical field [0001] The invention belongs to the technical field of alumina production red mud treatment technology, and in particular relates to a method for preparing red mud pellets from alumina waste red mud. Background technique [0002] In the alumina production of aluminum ore by the Bayer process, bauxite is mixed with lime and circulating lye to make qualified pulp and then dissolved. Under the action of high temperature and high pressure, the alumina in the ore enters the solution, and the insoluble matter is red mud. After the dissolution, the ore pulp is diluted and settled for solid-liquid separation, and the bottom flow red mud slurry produced is reverse washed three times, filtered to recover the attached alkali, and then discharged. The production of 1 ton of alumina will produce 1.1 to 1.5 tons of red mud. With the rapid development of the alumina industry in recent years, the global annual alumina production has reached nearly 100 million tons, and China...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248
Inventor 甘霖许家伟张正林梁愈斌韦茂森温超焕
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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