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Method for preparing magnesium sulfuric acid monohydrate with mixture salt of sodium chloride and epsomite

A sodium chloride and mixed salt technology, applied in directions such as magnesium sulfate, can solve the problems of high energy consumption, high production cost, heavy environmental pollution, etc., and achieve the effects of low energy consumption, low production cost, and no environmental pollution

Inactive Publication Date: 2008-12-10
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high energy consumption and high production cost, and the discharged waste liquid has serious environmental pollution.

Method used

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  • Method for preparing magnesium sulfuric acid monohydrate with mixture salt of sodium chloride and epsomite
  • Method for preparing magnesium sulfuric acid monohydrate with mixture salt of sodium chloride and epsomite
  • Method for preparing magnesium sulfuric acid monohydrate with mixture salt of sodium chloride and epsomite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) fully mix the mixed salt of raw material sodium chloride and epsom salt (for extracting the tailings after potassium and magnesium fertilizer), the specific chemical composition of raw material is shown in Table 1; (2) batching, take mixed salt 551.32g, Add 255.34g of fresh water, 540.46g of bittern (the discharge mother liquor after evaporating and crystallizing potassium chloride and langbeinite in the processing of salt fields, commonly known as old brine, and the main component is magnesium chloride), and stir evenly; (3) heat to 75° C. (4) filter out the undissolved NaCl; (5) heat the mother liquor after filtering off the undissolved NaCl to 75°C, and concentrate by vacuum multi-effect evaporation until about 338.2g of water is evaporated ( Keep the temperature at 75°C, and the evaporation time is about 30 minutes), crystallize fine-grained magnesium sulfate monohydrate and coarse sodium chloride from the mother liquor; (7) filter to obtain fine-grained magnesiu...

Embodiment 2

[0023] (1) Fully mix the mixed salt of raw material sodium chloride and Epsom salt (tailings after extracting potassium and magnesium fertilizer), the specific chemical composition of the raw material is shown in Table 3; (2) ingredients, weigh 546.12g of mixed salt, add 247.05g of fresh water, 536.01g of brine (the mother liquor discharged from salt fields after processing and evaporating crystallized potassium chloride and lenbeinite, commonly known as old brine, the main component is magnesium chloride), and stir evenly; (4) filter out the undissolved NaCl; (5) heat the mother liquor after filtering off the undissolved NaCl to 75° C., and concentrate by vacuum multi-effect evaporation until about 334.1 g of water (temperature Keep it constant at 75°C, and the evaporation time is 30 minutes), crystallize fine-grained magnesium sulfate monohydrate and coarse-grained sodium chloride from the mother liquor; (7) filter to obtain a mixture of fine-grained magnesium sulfate monohyd...

Embodiment 3

[0030] (1) Fully mix the mixed salt (tailings after extracting potassium and magnesium fertilizer) of raw material sodium chloride and epsom salt, the specific chemical composition of the raw material is shown in Table 5; (2) ingredients, weigh 554g of mixed salt, add fresh water 256g, 544.5g of brine (the discharge mother liquor after evaporating crystalline potassium chloride and magnesite in the salt fields, commonly known as old brine, the main component is magnesium chloride), stir evenly; (3) heat to 75°C, heat-dissolve for half an hour, Promote the dissolution of mixed salts; (4) filter out the undissolved NaCl; (5) heat the mother liquor after filtering out the undissolved NaCl to 75°C, and concentrate by vacuum multi-effect evaporation until about 335.2g of water is evaporated (the temperature is maintained at 75 ℃ constant, about 30 minutes of evaporation time), from the mother liquor crystallization fine magnesium sulfate monohydrate and coarse sodium chloride; (7) f...

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Abstract

The invention relates to a method for preparing magnesium sulfate monohydrate by utilization of salt-mixture of sodium chloride and epsomite, comprising the following steps: firstly, the salt-mixture of raw materials sodium chloride and epsomite is uniformly mixed; secondly, mixture is prepared by the following raw materials by weight portion: 545 to 555 portions of the salt-mixture, 246 to 256 portions of water and 535 to 545 portions of brine; thirdly, the prepared mixture material is heated up to between 74 and 76 DEG C so as to promote dissolution of the salt-mixture; fourthly, undissolved NaCl is filtered; fifthly, mother liquor after the undissolved NaCl is filtered is heated up to between 74 and 76 DEG C and then evaporated and concentrated until fine grains, namely the magnesium sulfate monohydrate, and rough grains, namely the sodium chloride are crystallized; sixthly, after filtration, mixture of the fine grains, namely the magnesium sulfate monohydrate, and the rough grains, namely the sodium chloride is obtained; and seventhly, a standard sieve with 325 meshes is adopted for sieving at a temperature of between 74 and 76, with the sodium chloride as oversize materials, and undersize materials are dried at a temperature of between 74 and 76 so as to obtain the magnesium sulfate monohydrate product. The method has mild operating conditions, low energy consumption, low production cost, no liquid waste emission, and no environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing magnesium sulfate monohydrate by using mixed salt of sodium chloride and epsom salt. Background technique [0002] Magnesium sulfate is widely used in a series of production fields such as medicine, leather and feed, and is one of the basic chemical raw materials for industrial and agricultural production. [0003] At present, the production of magnesium sulfate monohydrate usually first prepares epsom salt, and then heats the epsom salt to decrystallize water to obtain magnesium sulfate monohydrate. [0004] Heating brine to 75°C to evaporate, concentrate and crystallize to obtain magnesium sulfate monohydrate, which is a new domestic production process of magnesium sulfate monohydrate. The raw brine used in this process must be low-sodium and high-magnesium brine, that is, there are certain requirements for the content of sodium chloride and epsom salt. Usually, the material is Na at 75°C. + , Mg 2+ ...

Claims

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Application Information

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IPC IPC(8): C01F5/40
Inventor 汤建良童德瑜李昱昀郑贤福黄银广邹娟夏适甘顺鹏
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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