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Method for preparing potassium sulfate from sodium sulfate

A technology of potassium sulfate and Glauber's salt, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal sulfite/sulfate purification, etc., can solve problems such as low yield of potassium sulfate, and achieve improved Conversion rate, improving the purity of raw materials, and improving the effect of utilization

Inactive Publication Date: 2018-03-30
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to provide a method for preparing potassium sulfate from mirabilite, by reducing the solubility of potassium sulfate, thereby solving the technical problem of low yield of potassium sulfate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: comprise the following steps:

[0024] (1) Accurately weigh 5 parts by weight of Na 2 SO 4 10H 2 O, weigh potassium chloride at a weight ratio of 2:1, use a water-alcohol system with a volume ratio of 100:5 as a solvent, and the solid-to-liquid ratio is 1:1.6, fully stir at room temperature for 1.9 h, suction filtration to obtain potassium mirabilite and mother liquor A, potassium mirabilite as the raw material of step (2), mother liquor A is obtained sodium chloride and filtrate A through heating, evaporation, concentration and crystallization by suction filtration, and filtrate A can be used as solvent recirculation to participate in the second ( 1) step reaction;

[0025] (2) Take potassium mirabilite and potassium chloride in a weight ratio of 4:1, the potassium mirabilite is obtained by suction filtration in step (1), and the water-alcohol system with a volume ratio of 100:9 is a solvent, and the solid The liquid ratio is 1:1.8, fully stirred at r...

Embodiment 2

[0026] Embodiment 2: comprise the following steps:

[0027] (1) Accurately weigh 5.2 parts by weight of Na 2 SO 4 10H 2 O, weigh potassium chloride at a weight ratio of 1:1, use a water-alcohol system with a volume ratio of 100:9 as a solvent, and the solid-to-liquid ratio is 1:1.5, fully stir at room temperature for 1.3 h, suction filtration to obtain potassium mirabilite and mother liquor A, potassium mirabilite as the raw material of step (2), mother liquor A is obtained sodium chloride and filtrate A through heating, evaporation, concentration and crystallization by suction filtration, and filtrate A can be used as solvent recirculation to participate in the second ( 1) step reaction;

[0028] (2) Take potassium mirabilite and potassium chloride in a weight ratio of 5:1, the potassium mirabilite is obtained by suction filtration in step (1), and the water-alcohol system with a volume ratio of 100:7 is used as a solvent, and the solid The liquid ratio is 1:1.7, fully st...

Embodiment 3

[0029] Embodiment 3: comprise the following steps:

[0030] (1) Accurately weigh 5.4 parts by weight of Na 2 SO 4 10H 2 O, weigh potassium chloride at a weight ratio of 1.9:1, use a water-alcohol system with a volume ratio of 100:8 as a solvent, and the solid-to-liquid ratio is 1:1.4, fully stir at room temperature for 1.1 h, suction filtration to obtain potassium mirabilite and mother liquor A, potassium mirabilite as the raw material of step (2), mother liquor A is obtained sodium chloride and filtrate A through heating, evaporation, concentration and crystallization by suction filtration, and filtrate A can be used as solvent recirculation to participate in the second ( 1) step reaction;

[0031] (2) Take potassium mirabilite and potassium chloride in a weight ratio of 4.9:1, the potassium mirabilite is obtained by suction filtration in step (1), and the water-alcohol system with a volume ratio of 100:8 is a solvent, and the solid The liquid ratio is 1:1.2, fully stirre...

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Abstract

The invention discloses a method for preparing potassium sulfate from sodium sulfate. The method is characterized by comprising the following steps: (1) performing a reaction by taking the salt lake sodium sulfate and potassium chloride as raw materials and a water-alcohol system as a solvent, performing a reaction under a room temperature for a period of time, performing filtration to obtain aphthitalite and a mother liquid A, performing concentration on the mother liquid A, performing crystallization, and performing vacuum filtration to obtain sodium chloride and a filtrate A; and (2) weighing the aphthitalite and potassium chloride, performing a reaction by taking a water-alcohol system as a solvent to obtain the potassium sulfate and a mother liquid B, performing concentration on the mother liquid B, performing crystallization, and performing vacuum filtration to obtain sodium chloride and a filtrate B. Compared with the prior art, the method provided by the invention reduces the production energy efficiency, shortens the production time, and improves the yield of the potassium sulfate.

Description

technical field [0001] The invention relates to a method for preparing potassium sulfate from Glauber's salt, in particular to a method for preparing potassium sulfate by using salt lake Glauber's salt as a raw material and using a water-alcohol system as a solvent. Background technique [0002] Potassium fertilizer is one of the most commonly used fertilizers in agricultural production, and potassium sulfate is an important potassium fertilizer with a very large demand. At present, there are many methods for preparing potassium sulfate with potassium chloride as the main raw material, such as Mannheim Glauber's salt method, ammonium sulfate conversion method, calcium sulfate method, ferrous sulfate method, etc. in double decomposition method, association method, extraction method, and double decomposition method. Among them, the preparation of potassium sulfate by Glauber's salt method is the most commonly used and most researched method. In my country, Glauber's salt mineral...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D5/16C01D3/04C01D3/14
CPCC01D5/00C01D3/04C01D3/14C01D5/16C01P2006/80
Inventor 齐誉但建明洪成林乔秀文李洪玲
Owner SHIHEZI UNIVERSITY
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