A kind of calcium-magnesium-containing pellets and preparation method thereof

A technology for magnesium pellets and pellets, which is applied in the field of pellets used in blast furnace ironmaking production, can solve the problems of sintering performance and metallurgical performance deviation, poor high temperature soft melt dripping performance, poor reducibility of ordinary acid pellets, etc. , to achieve the effect of improving sintering properties and metallurgical properties, optimizing high-temperature metallurgical performance indicators, and improving high-temperature metallurgical performance indicators

Active Publication Date: 2019-06-21
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ordinary acidic pellets have poor reducibility and poor high-temperature reflow dripping performance, which are not conducive to the stable operation of the blast furnace. Therefore, the proportion of ordinary acidic pellets in the blast furnace is not high, often resulting in insufficient pellets. alternative, thereby increasing the blast furnace slag ratio
At the same time, the magnesium content of sinter raw materials used in blast furnace ironmaking is relatively high, which makes its sintering performance and metallurgical performance deviation, mainly in the slow sintering speed, high temperature reflow temperature, difficulty in separating slag and iron, etc.
In addition, light-burned dolomite manufacturers have piled up a large amount of dust removal outdoors, which has caused great pressure on environmental protection, and light-burned dolomite dust removal contains a large amount of calcium and magnesium substances, causing great waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A calcium-magnesium-containing pellet, which is composed of the following components in weight percentage: 16% magnesium-containing weak magnetic concentrate, 70% magnetite concentrate, 3% dedusting ash of lightly burned dolomite, 1.5% bentonite, and 9.5% water . Among them, the magnesium-containing weak magnetic concentrate is an iron concentrate containing 59.5-60.5% iron, 3.3-3.7% magnesium, and 1.3-1.6% calcium; the iron content in the magnetite concentrate is 60-62%, and the magnesium content is 0.8- 1.2%, calcium content 1.0-1.5%. The dedusting ash of light-burned dolomite is produced in the process of producing light-burned dolomite by rotary kiln, in which MgO content is 26-30%, CaO content is 45-52%, SiO 2 The content is 4-5%.

[0024] The preparation of the calcium-magnesium-containing pellets comprises the following steps:

[0025] A. Weigh calcium-magnesium-containing weak magnetic concentrate, magnetite concentrate, dedusting ash of lightly burned dolom...

Embodiment 2

[0030] A calcium-magnesium-containing pellet, which is composed of the following components in weight percentage: 14% magnesium-containing weak magnetic concentrate, 72.5% magnetite concentrate, 3% dedusting ash of lightly burned dolomite, 1.5% bentonite, and 9% water . Among them, the magnesium-containing weak magnetic concentrate is an iron concentrate containing 59.5-60.5% iron, 3.3-3.7% magnesium, and 1.3-1.6% calcium; the iron content in the magnetite concentrate is 60-62%, and the magnesium content is 0.8- 1.2%, calcium content 1.0-1.5%. The dedusting ash of light-burned dolomite is produced in the process of producing light-burned dolomite by rotary kiln, in which MgO content is 26-30%, CaO content is 45-52%, SiO 2 The content is 4-5%.

[0031] The preparation of the calcium-magnesium-containing pellets comprises the following steps:

[0032] A. Weigh calcium-magnesium-containing weak magnetic concentrate, magnetite concentrate, dedusting ash of lightly burned dolom...

Embodiment 3

[0037] A calcium-magnesium-containing pellet, consisting of the following components in weight percentage: 17% magnesium-containing weak magnetic concentrate, 68% magnetite concentrate, 3.7% dedusting ash of lightly burned dolomite, 1.8% bentonite, and 9.5% water . Among them, the magnesium-containing weak magnetic concentrate is an iron concentrate containing 59.5-60.5% iron, 3.3-3.7% magnesium, and 1.3-1.6% calcium; the iron content in the magnetite concentrate is 60-62%, and the magnesium content is 0.8- 1.2%, calcium content 1.0-1.5%. The dedusting ash of light-burned dolomite is produced by the rotary kiln in the process of producing light-burned dolomite, in which the content of MgO is 26-30%, the content of CaO is 45-52%, and the content of SiO 2 The content is 4-5%.

[0038] The preparation of the calcium-magnesium-containing pellets comprises the following steps:

[0039] A. Weigh calcium-magnesium-containing weak magnetic concentrate, magnetite concentrate, dedus...

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Abstract

The invention discloses a calcium-magnesium-containing pellet and a preparation method of the calcium-magnesium-containing pellet. The calcium-magnesium-containing pellet is composed of magnesium-containing flux-weakening concentrate, magnetic concentrate, dedusting ash of lightly-burnt dolomite, bentonite and water. Through the cooperation of the low-magnesium magnetic concentrate, the magnesium-rich flux-weakening concentrate and the calcium-magnesium-rich lightly-burnt dolomite, the content of calcium and magnesium of the pellet is further increased; the content of magnesium of the prepared calcium-magnesium-containing pellet can reach over 2.0%, the content of calcium can reach over 2.0%, the reduction degree is increased to 74-78%, the softening start temperature is increased to about 30 DEG C, and the soft heat interval is reduced by about 40 DEG C, so that the high-temperature metallurgical performance of the pellet is improved remarkably; meanwhile, the dedusting ash of the lightly-burnt dolomite is added to the pellet, the high-temperature metallurgical performance of the pellet is improved, and the environment protection problem caused by outdoor stockpiling of the dedusting ash is solved; and due to the fact that the dedusting ash of the light-burnt dolomite is fine, the supplying amount of the bentonite is reduced as well, and the content of SiO2 brought into the pellet is reduced.

Description

technical field [0001] The invention belongs to the technical field of pellets for blast furnace ironmaking production, and in particular relates to a calcium-magnesium-containing pellet and a preparation method thereof. Background technique [0002] Ordinary acidic pellets have poor reducibility and poor high-temperature reflow dripping performance, which are not conducive to the stable operation of the blast furnace. Therefore, the proportion of ordinary acidic pellets in the blast furnace is not high, often resulting in insufficient pellets. Instead, the ratio of blast furnace slag is increased. At the same time, the magnesium content of sinter raw materials used in blast furnace ironmaking is relatively high at present, which makes its sintering performance and metallurgical performance deviation, mainly manifested in slow sintering speed, high temperature reflow temperature, and difficulty in separating slag and iron. In addition, light-burned dolomite manufacturers ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C22B1/24
CPCC21B5/008C22B1/2406
Inventor 胡容刘树林田改霞王友胜冯翠萍
Owner JIUQUAN IRON & STEEL GRP
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