Method for producing potassium sulphate and aluminium chloride by utilizing potassium alum

A technology of potassium sulfate and potassium alum, which is applied in the preparation of aluminum chloride, aluminum halide, sulfate/bisulfate, etc., can solve the problems of high production cost, high energy consumption of evaporation and concentration, and high energy consumption of high-temperature roasting, and achieves Easy solid-liquid separation, easy industrial implementation, and high material utilization

Inactive Publication Date: 2015-07-01
傅培鑫 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, environmental pollution
Third, the process is difficult
Self-adhesive and puffing occur in the dehydration process of alum, the process is long and difficult
Fourth, the leaching solution is evaporated and concentrated to extract potassium sulfate, which has a large amount of evaporated water and high energy consumption.
There are problems, one is NH 3 Recycling and Environmental Pollution
Second, it is difficult to filter gel-like aluminum hydroxide, and high-temperature roasting consumes a lot of en

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  • Method for producing potassium sulphate and aluminium chloride by utilizing potassium alum

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Experimental program
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Effect test

Embodiment １

[0018] In this embodiment, method 1 is adopted, that is, the first crystallization mother liquor obtained in the first stage of preparing potassium sulfate directly enters the stage of preparing aluminum chloride.

[0019] Materials for use: 100 grams of potassium alum, 50 grams of potassium chloride and an appropriate amount of water (containing potassium alum crystal water, the same below) as a solvent, the amount of water can be completely dissolved and selected with the material, and the water in this embodiment is 250 grams. 100 grams of the above-mentioned potassium alum and 50 grams of potassium chloride are the theoretical amount, and the actual consumption is 100-110% of the theoretical amount. Its preparation method includes the following stages:

[0020] (1), potassium alum / potassium chloride metathesis reaction crystallization method to prepare potassium sulfate stage:

[0021] 100 grams of Potassium Alum and 50 grams of Potassium Chloride are placed in 250 grams ...

Embodiment ２

[0025] In this embodiment, method 2 is adopted, that is, the stage of producing potassium sulfate is repeated several times.

[0026] (1), potassium alum / potassium chloride metathesis reaction crystallization method to prepare potassium sulfate stage:

[0027] Materials for use: 100 grams of potassium alum, 50 grams of potassium chloride and an appropriate amount of water (containing alum crystal water, the same below) as a solvent, the amount of water can be completely dissolved and selected with the material, and the water in this embodiment is 250 grams. 100 grams of the above-mentioned potassium alum and 50 grams of potassium chloride are the theoretical amount, and the actual consumption is 100-110% of the theoretical amount. Its preparation method includes the following stages:

[0028] Put 100 grams of Potassium Alum and 50 grams of Potassium Chloride in 250 grams of water, heat and dissolve for the first time, stir thoroughly, and after the material is completely diss...

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Abstract

The invention relates to a method for producing potassium sulphate and aluminium chloride by utilizing potassium alum. According to the method, the selected materials are the potassium alum, potassium chloride and water as a solvent, and the weight ratio of the potassium alum and the potassium chloride is 1.5-2.5:1. The produduction method comprises a stage for preparing the potassium sulphate through a potassium alum/ potassium chloride complex decomposition reactive crystallization method, and a stage for preparing the aluminium chloride through evaporation and concentration crystallization, wherein the potassium sulphate preparation stage can be carried out for one time or several times circularly; during the stage, the replacement reaction temperature is larger than or equal to 60 DEG C, the reaction time is larger than or equal to 20min, the solid-liquid separation and insulation temperature is larger than or equal to 50 DEG C, and the evaporation and concentration crystallization temperature is larger than or equal to 90 DEG C. Compared with the existing method for producing the potassium sulphate and the aluminium chloride by utilizing the potassium alum, the method has the beneficial effects of short technological process (one-step conversion), easiness in solid-liquid separation, low energy consumption, no environment pollution, low production cost, easiness in industrialization implementation, high material utilization ratio and the like.

Description

technical field [0001] The invention belongs to the technical field of potassium sulfate and aluminum chloride production, and in particular relates to a method for producing potassium sulfate and aluminum chloride by using potassium alum. Background technique [0002] Potassium alum is a potassium aluminum sulfate double salt with the molecular formula K 2 SO 4 ·Al 2 (SO 4 ) 3 24 hours 2 O. [0003] The existing methods of utilizing potassium alum to produce potassium sulfate and aluminum chloride include alum pyrolysis method, alum ammonolysis method, alum potassium hydroxide replacement method and the like. [0004] Alum pyrolysis produces potassium sulfate and alumina. The main processes are alum dehydration (to produce dry alum, that is, anhydrous alum), thermal decomposition, desulfurization, hot water leaching, solid-liquid separation, evaporation, concentration and crystallization. There are problems, one is high energy consumption. Alum dehydration (300-400°...

Claims

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Application Information

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IPC IPC(8): C01D5/06C01F7/56
Inventor 傅培鑫潘同汉
Owner 傅培鑫
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