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Production method of magnesium sulfate monohydrate

A production method, the technology of magnesium sulfate, applied in the direction of magnesium sulfate, etc., can solve the problems of high energy consumption, complex process of magnesium sulfate monohydrate, high equipment requirements, etc., and achieve the effects of low energy consumption, good commercial effect and short process route

Inactive Publication Date: 2015-01-21
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, solve the shortcomings of the existing drying and dehydration method to prepare magnesium sulfate monohydrate, such as complex process, high equipment requirements, and large energy consumption, and adopt dehydration with concentrated sulfuric acid to directly prepare from magnesium sulfate heptahydrate Provide a simple and energy-saving production method of magnesium sulfate monohydrate

Method used

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  • Production method of magnesium sulfate monohydrate
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Effect test

Embodiment 1

[0026] Pump 2000Kg of saturated magnesium sulfate solution at 60°C into the glass-lined reactor, start stirring, slowly add 760Kg of sulfuric acid with a mass concentration of 90% or 650Kg of sulfuric acid with a mass concentration of 98%, and continue stirring for 1 hour after the addition is complete. Then pump it into the plate and frame filter press for filtration while it is hot. After the filtration, pump a saturated solution of magnesium sulfate at 70°C into the plate and frame filter press to wash the filter cake once, then wash it with tap water for 1-2 times, combine the filtrate and washing liquid, and return to the filter cake. For the production of magnesium sulfate heptahydrate or magnesium sulfate solution. Take out the filter cake and send it to a vibrating bed drier to dry at 120-150°C for 0.5 hour to obtain magnesium sulfate monohydrate.

Embodiment 2

[0028] Add 2000Kg of magnesium sulfate heptahydrate into the glass-lined reactor, slowly add 680Kg of sulfuric acid with a mass concentration of 90% or 600Kg of sulfuric acid with a mass concentration of 98%, and slowly start the stirring reaction for 80 minutes after the addition is completed. Then pump it into the plate and frame filter press to filter while it is hot. After the filtration, pump the saturated solution of magnesium sulfate at 70°C into the plate and frame filter press to wash the filter cake once, then wash it with tap water for 1-2 times, and combine the filtrate and washing solution. Return for the production of magnesium sulfate heptahydrate or magnesium sulfate solution. Take out the filter cake and send it to a vibrating bed drier to dry at 120-150°C for 0.5 hour to obtain magnesium sulfate monohydrate.

Embodiment 3

[0030] Pump 2000Kg of saturated magnesium sulfate solution at 80°C into the glass-lined reactor, start stirring, slowly add 720Kg of sulfuric acid with a mass concentration of 90% or 620Kg of sulfuric acid with a mass concentration of 98%, and continue stirring for 80 minutes after the addition is complete. Then pump it into the plate and frame filter press for filtration while it is hot. After the filtration, pump a saturated solution of magnesium sulfate at 70°C into the plate and frame filter press to wash the filter cake once, then wash it with tap water for 1-2 times, combine the filtrate and washing liquid, and return to the filter cake. For the production of magnesium sulfate heptahydrate or magnesium sulfate solution. Take out the filter cake and send it to a vibrating bed drier to dry at 120-150°C for 0.5 hour to obtain magnesium sulfate monohydrate.

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Abstract

The invention discloses a production method of magnesium sulfate monohydrate. The production method of magnesium sulfate monohydrate is characterized by comprising the following steps: adding 1200-3500 parts by mass of 90-98% concentrated sulfuric acid into 1500-2500 parts by mass of magnesium sulfate heptahydrate or 1800-3000 parts by mass of a magnesium sulfate saturated aqueous solution with the temperature of 50-90 DEG C under the condition of stirring, and stirring and reacting for 1-2 hours to obtain a suspension liquid of magnesium sulfate monohydrate; filtering the suspension liquid, washing a filter cake once by using the magnesium sulfate saturated aqueous solution, and then washing once to twice by using water; and drying the washed filter cake for 0.5-1 hour at 120-150 DEG C to prepare magnesium sulfate monohydrate. The production method disclosed by the invention is short in production process, simple in equipment, low in energy consumption and low in cost, is suitable for industrial large-scale production, and is good in commercial effect and strong in practicability.

Description

technical field [0001] The invention belongs to the preparation of metal magnesium compounds, and relates to a production method of magnesium sulfate monohydrate. The magnesium sulfate monohydrate prepared by the invention can be used as dual-element fertilizer, food additive, stabilizer, printing and dyeing weighting agent, filler, etc., and can be widely used in industries such as agriculture, food, tanning, papermaking, medicine, and electroplating. Background technique [0002] As an important inorganic chemical product, magnesium sulfate has a wide range of uses. The common magnesium sulfate is mainly magnesium sulfate heptahydrate and magnesium sulfate monohydrate. Compared with magnesium sulfate monohydrate, magnesium sulfate heptahydrate has lower sulfur-containing magnesium content, and the product is easy to agglomerate when stored for a long time, and it is difficult to mix with other materials. Large, low price, limited market and other shortcomings, processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
CPCC01F5/40
Inventor 廖辉伟张亚莉刘永涛张俊茹曾卓王少波郭文杰唐刚
Owner SOUTHWEAT UNIV OF SCI & TECH
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