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A method for making cold-pressed pellets for steelmaking

A production method and technology of cold-pressed pellets, which are applied in the field of steelmaking, can solve the problems of poor early strength, long curing period and low ball formation rate, and achieve high bonding strength, short drying time and high ball formation rate. Effect

Active Publication Date: 2017-04-05
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the cold-setting pellet production uses bentonite and cement as binders, which not only have poor strength in the early stage, low pelleting rate, and long maintenance period, but also in the later use process, the steelmaking system produces a large amount of waste residue, which makes the post-processing cause certain difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Use steelmaking secondary dedusting ash, converter mud, and iron oxide scale to pre-mix according to the ratio of 22:60:18, and prepare a total of 300 kg of mixed materials.

[0015] (2) Dissolve 300 g of water-soluble sodium carboxymethylcellulose (CMC) in 12 kg of industrial waste liquid and stir well to prepare a binder.

[0016] (3) Prepare magnesium chloride solution. Magnesium chloride hexahydrate and water were prepared into 5 kg of solution in a ratio of 1:1 by weight for later use.

[0017] (4) Add 12 kg of binder to the mixed material, add 4 kg of magnesium chloride solution, mix the material for 120 seconds again through a planetary wheel mill, and enter it into a GY650-220C briquette machine for molding. The diameter of the compressed cold-pressed pellets is 50mm× 35mm×24mm, stack and dry naturally for 72H.

[0018] After testing, the compressive strength of the prepared cold-pressed pellets was 812 N, and the drop strength was 9.2 times·0.5m.

Embodiment 2

[0020] (1) Use steelmaking secondary dedusting ash, converter mud, and iron oxide scale to pre-mix according to the ratio of 25:63:12, and prepare a total of 300 kg of mixed materials.

[0021] (2) Dissolve 300 g of water-soluble sodium carboxymethylcellulose (CMC) in 12 kg of industrial waste liquid and stir well to prepare a binder.

[0022] (3) Prepare magnesium chloride solution. Magnesium chloride hexahydrate and water are prepared into 5 kg solution according to the ratio of 1:1 by weight.

[0023] (4) Add 12 kg of binder to the mixed material, add 4 kg of magnesium chloride solution, mix the material for 120 seconds again through a planetary wheel mill, and enter it into a GY650-220C briquette machine for molding. 35mm×24mm, stack and dry naturally for 72H.

[0024] After testing, the compressive strength of the prepared cold-pressed pellets was 794 N, and the drop strength was 8.9 times·0.5m.

Embodiment 3

[0026] (1) Use steelmaking secondary dedusting ash, converter mud, and iron oxide scale to pre-mix according to the ratio of 23:63:14, and prepare a total of 300 kg of mixed materials.

[0027] (2) Dissolve 300 g of water-soluble sodium carboxymethylcellulose (CMC) in 12 kg of industrial waste liquid and stir well to prepare a binder.

[0028] (3) Prepare magnesium chloride solution. Magnesium chloride hexahydrate and water were prepared into 5 kg of solution in a ratio of 1:1 by weight for later use.

[0029] (4) Add 10 kg of binder to the mixed material, add 4 kg of magnesium chloride solution, mix the material for 120 seconds again through a planetary wheel mill, and enter it into a GY650-220C briquette machine for molding. 35mm×24mm, stack and dry naturally for 72H.

[0030] After testing, the compressive strength of the prepared cold-pressed pellets was 843 N, and the drop strength was 9.7 times·0.5m.

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Abstract

A manufacturing method for cold-pressed pellets for steelmaking comprises the manufacturing technological steps that (1) steelmaking secondary fly ash, converter mud and oxide scale are mixed in advance with the weight ratio of (20-23):(55-65):(10-20), and evenly stirred into a mixture; (2) a binder is prepared through water-soluble sodium carboxymethycellulose and industrial effluent at the weight ratio of 1:(15-50) for standby application; (3) a magnesium chloride solution is prepared by magnesium chloride hexahydrate and water at the weight ratio of 1:1 for standby application; (4) 3%-5% of binder and 0.5%-1.5% of magnesium chloride solution are added in the mixture, mixing is carried out by an edge runner mill for 100-150 s, and a pellet material is made; (5) the pellet material is put into a ball press machine to achieve cold-press formation, the diameter of the pellets is 45-55 mm*30-40 mm *20-30 mm, and the pellets are naturally stacked and aired. The cold-pressed pellets manufactured through the method have the advantages that the pellet forming rate is high, the bonding strength is large, the drying time is short after pellet formation, and use for steelmaking is convenient.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for making cold-pressed pellets for steelmaking. Background technique [0002] Dust is generated during the smelting process of iron and steel enterprises, and the dust is collected by a dust collector and becomes dust. The comprehensive use of dedusting ash has always been an important topic in the research of circular economy. Under the current circumstances, the processing methods of dust removal include returning to the sintering system for reuse and making cold-pressed pellets. Making cold-pressed pellets is a better environmental protection treatment method for dust removal, which can better solve environmental problems and achieve the purpose of saving energy and reducing consumption. Compared with the method of returning to the sintering system to make cold-pressed pellets by using dust removal ash for reuse, the problem of dust in the sintering...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248C22B1/244
Inventor 任天飞杨琦云张威唐忠潘伟张德强傅双波邓松泉
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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