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Preparation method of magnesium sulfate monohydrate

A technology of magnesium sulfate heptahydrate and magnesium sulfate, applied in the direction of magnesium sulfate, energy input, etc., can solve the problems of low content of sulfur-containing magnesium in magnesium sulfate heptahydrate, long-term storage of products, easy agglomeration, and difficult mixing, so as to save equipment Good investment and commercial effect, good energy saving effect

Inactive Publication Date: 2017-09-15
江苏联慧资源环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the shortcomings of magnesium sulfate heptahydrate, such as low sulfur-containing magnesium components, long-term product storage and easy agglomeration, difficulty in mixing with other materials, low price, and limited market, the invention further reduces energy consumption, saves costs, and makes full use of Effective resource, the present invention proposes a method for producing magnesium sulfate monohydrate by drying magnesium sulfate heptahydrate using the heat of flue gas produced in the sintering / pelletizing process of a steel plant

Method used

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  • Preparation method of magnesium sulfate monohydrate
  • Preparation method of magnesium sulfate monohydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A preparation method for magnesium sulfate monohydrate, comprising the following steps:

[0026] (1) drop the magnesium sulfate heptahydrate containing surface water 3wt%~12wt% in the vibrating fluidized bed;

[0027] (2) Continuously feed the high-temperature flue gas generated in the sintering process into the vibrating fluidized bed described in step (1) to dry the wet material; control the flue gas flow rate in the drier to u≥2.5m / s, The temperature of the flue gas is 180°C. At this time, magnesium sulfate heptahydrate absorbs the heat of the flue gas and then dries to generate magnesium sulfate monohydrate;

[0028] (3) collect magnesium sulfate monohydrate from the outlet of vibrating fluidized bed.

[0029] (4) Carry out tail gas treatment step again, specifically:

[0030] After drying and using the exhaust gas, the fine powder materials brought out of the exhaust gas are recovered by the dust collector, and collected into the bag of the dust collector to red...

Embodiment 2

[0032] A preparation method for magnesium sulfate monohydrate, comprising the following steps:

[0033] (1) drop the magnesium sulfate heptahydrate containing surface water 3wt%~12wt% in the rotary kiln;

[0034] (2) Continuously feed the high-temperature flue gas generated in the sintering process into the vibrating fluidized bed described in step (1) to dry the wet material; control the flue gas flow rate in the drier to u≥2.5m / s, The temperature of the flue gas was 120°C. At this time, magnesium sulfate heptahydrate absorbs the heat of the flue gas and then dries to generate magnesium sulfate monohydrate;

[0035] (3) Collect magnesium sulfate monohydrate from the outlet of rotary kiln.

[0036] (4) Carry out tail gas treatment step again, specifically:

[0037] After drying and using the exhaust gas, the fine powder materials brought out of the exhaust gas are recovered by the dust collector, and collected into the bag of the dust collector to reduce the loss of fine po...

Embodiment 3

[0039] A preparation method for magnesium sulfate monohydrate, comprising the following steps:

[0040] (1) drop the magnesium sulfate heptahydrate containing surface water 3wt%~12wt% in the vibrating fluidized bed;

[0041] (2) Continuously feed the high-temperature flue gas generated in the pelletizing process into the vibrating fluidized bed described in step (1) to dry the wet material; control the flue gas flow rate inside the dryer u ≥ 2.5m / s , the temperature of the flue gas is 160°C, at this time, magnesium sulfate heptahydrate absorbs the heat of the flue gas and dries to generate magnesium sulfate monohydrate;

[0042] (3) collect magnesium sulfate monohydrate from the outlet of vibrating fluidized bed.

[0043] (4) Carry out tail gas treatment step again, specifically:

[0044] After drying and using the exhaust gas, the fine powder materials brought out of the exhaust gas are recovered by the dust collector, and collected into the bag of the dust collector to red...

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Abstract

The invention relates to a preparation method of magnesium sulfate monohydrate and particularly relates to a method which is used for preparing magnesium sulfate monohydrate from magnesium sulfate heptahydrate and has the effect that effective resources are reasonably utilized. According to the preparation method, exhaust gas produced in a sintering or pelletizing procedure in an iron and steel plant is used as a drying medium for drying magnesium sulfate heptahydrate so as to obtain magnesium sulfate monohydrate. The method has the characteristics that the waste heat of exhaust gas is adequately utilized, the steam is not consumed in a drying process, and the energy saving and consumption reducing effects are good; an indirect heat exchange link is reduced, the heat efficiency is high, and the equipment investment is saved; and the cost is lowered by 30%-50%, and the commercial effect is good.

Description

technical field [0001] The invention relates to a preparation method of magnesium sulfate monohydrate, in particular to a method for rationally utilizing effective resources to prepare magnesium sulfate monohydrate from magnesium sulfate heptahydrate. Background technique [0002] In iron and steel enterprises, sintering / pelletizing is an important treatment process before iron ore enters blast furnace ironmaking. Sintering / pelletizing can make full use of powdery raw materials and expand ore sources. The products have relatively uniform particle size, high porosity and sufficient strength, and are good The reduction and slagging performance of the material improves the metallurgical properties of the material, which is beneficial to the strengthening of blast furnace ironmaking. [0003] However, a large amount of industrial waste gas is produced during the sintering / pellet production process, and each ton of sintering / pellet ore produces about 4000-6000m3 3 Flue gas, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
CPCY02P20/129C01F5/40
Inventor 李桂勇况勤王俊杰
Owner 江苏联慧资源环境科技有限公司
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