Method and fluidized-bed plant for preparing magnesium sulfate monohydrate by using magnesium sulfate heptahydrate

A technology of magnesium sulfate heptahydrate and fluidized bed, applied in directions such as magnesium sulfate, can solve problems such as high cost and complicated process of magnesium sulfate monohydrate, and achieve the effects of easy control, good dehydration effect and excellent economic benefit.

Active Publication Date: 2013-11-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the shortcomings of existing dehydration method for preparing magnesium sulfate monohydrate, such as complicated process and high cost, and provides an improved method for preparing magnesium sulfate monohydrate from magnesium sulfate heptahydrate

Method used

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  • Method and fluidized-bed plant for preparing magnesium sulfate monohydrate by using magnesium sulfate heptahydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Magnesium sulfate heptahydrate wet material: In a small crusher, partially agglomerated magnesium sulfate heptahydrate is crushed, and then the crushed magnesium sulfate heptahydrate material is screened with a 25-mesh large-scale mesh screen, and the fine material is kept for later use. Fluidized drying.

[0039] Fluidized bed preheating: control blast and induced wind velocity to 15m respectively 3 / s and 20m3 / s, set the bed temperature of No. 1 to No. 3 fluidized beds as 50°C, 100°C and 160°C respectively, and turn on the blast heating switch to heat the air.

[0040] Feeding: After the bed temperature of each fluidized bed reaches the expected value, start feeding. The sieved magnesium sulfate heptahydrate wet material is sent into the feeding port, and the material is transported to the No. 1 fluidized bed through a screw feeder, and the feeding speed is controlled at 30m / min.

[0041] Segmented fluidization: the wet material of magnesium sulfate heptahydrate is...

Embodiment 2

[0045] Magnesium sulfate heptahydrate wet material: In a small crusher, partially agglomerated magnesium sulfate heptahydrate is crushed, and then the crushed magnesium sulfate heptahydrate material is screened with a 25-mesh large-scale mesh screen, and the fine material is kept for later use. Fluidized drying.

[0046] Fluidized bed preheating: control blast and induced wind velocity to 20m respectively 3 / s and 30m 3 / s, set the temperature of furnace chambers 1 to 3 as 70°C, 120°C and 180°C respectively, and turn on the blast heating switch to heat the air.

[0047] Feeding: After the bed temperature of each fluidized bed reaches the expected value, start feeding, and send the sieved magnesium sulfate heptahydrate wet material into the feeding port, and the material is transported to the No. 1 fluidized bed through a screw feeder. Its feeding speed is controlled to be 20m / min.

[0048] Segmented fluidization: The wet material of magnesium sulfate heptahydrate is fluidiz...

Embodiment 3

[0052] Magnesium sulfate heptahydrate wet material: In a small crusher, partially agglomerated magnesium sulfate heptahydrate is crushed, and then the crushed magnesium sulfate heptahydrate material is screened with a 25-mesh large-scale mesh screen, and the fine material is kept for later use. Fluidized drying.

[0053] Fluidized bed preheating: control blast and induced wind velocity to 25m respectively 3 / s and 25m 3 / s, set the temperature of furnace chambers 1 to 3 as 90°C, 140°C and 200°C respectively, and turn on the blast heating switch to heat the air.

[0054] Feeding: After the bed temperature of each fluidized bed reaches the expected value, start feeding, and send the sieved magnesium sulfate heptahydrate wet material into the feeding port, and the material is transported to the No. 1 fluidized bed through a screw feeder. Its feeding speed is controlled to be 20m / min.

[0055] Segmented fluidization: The wet material of magnesium sulfate heptahydrate is fluidiz...

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Abstract

The invention discloses a method for preparing magnesium sulfate monohydrate by using magnesium sulfate heptahydrate. The method is characterized in that magnesium sulfate heptahydrate material sequentially pass through at least two fluidized beds of which the bed body temperatures are increased gradually so that the magnesium sulfate heptahydrate material is dehydrated step by step, thus obtaining the magnesium sulfate heptahydrate, wherein the bed body temperatures of the fluidized beds are controlled in a range of 50-200 DEG C. According to the method, the multi-chamber fluidized beds are utilized to dry the magnesium sulfate monohydrate and the magnesium sulfate monohydrate is dehydrated step by step to prepare the magnesium sulfate heptahydrate, so that the drying temperature is easily controlled, the dehydration effect is good, the process flow is simple, energy-saving and environment-friendly, and the economic benefit is excellent.

Description

technical field [0001] The invention relates to a production process of magnesium sulfate, in particular to a method for preparing magnesium sulfate monohydrate from magnesium sulfate heptahydrate, and multi-chamber fluidized bed equipment. Background technique [0002] Magnesium sulfate is a dual-nutrient high-quality fertilizer. Since sulfur and magnesium are medium elements in crops, it has been widely used in agricultural production. The common magnesium sulfate is mainly magnesium sulfate heptahydrate and magnesium sulfate monohydrate. Among them, magnesium sulfate monohydrate has low moisture content, high sulfur and magnesium content, and can be used as a fertilizer additive to prevent fertilizers from agglomerating. Domestic The external demand for magnesium sulfate monohydrate is gradually increasing, which has a very broad market prospect and strong application potential. [0003] At present, the production process of magnesium sulfate monohydrate mainly includes ...

Claims

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Application Information

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IPC IPC(8): C01F5/40
Inventor王敏赵有璟时历杰康为清都永生
OwnerQINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI