Inversely feeding ammonium chloride producing process in serial system

A technology of ammonium chloride and reverse feed, applied in the direction of ammonium halide, etc., can solve the problems of easy production of defective products, general quality of ammonium chloride, and low output of refined ammonium, and achieve the effect of increasing production and improving the quality of agricultural ammonium products

Inactive Publication Date: 2006-02-01
TIANJIN BOHUA YONGLI CHEM IND
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Problems solved by technology

[0002] Compared with the combined process of ammonium chloride production in the traditional combined soda production process, the reverse material process has better operational stability, and more salt can be added to the system, which can reduce the mother liquor equivalent and increase the ammonium chloride yield. At the same time It can provide high-quality alkali-making mother liquor and ammonia mother liquor II for the alkali-making process, but its disadvantage is that it cannot produce refined ammonium
Combined material process is good at producing refined ammonium while producing agricultural ammonium, but it cannot reflect the above-mentioned advantages of reverse material process
When the two processes coexist, the total output of ammonium chloride is relatively low. Although there are refined ammonium products, the refined ammonium output is relatively low, and the quality of agricultural ammonium chloride is also very general. Defective

Method used

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  • Inversely feeding ammonium chloride producing process in serial system
  • Inversely feeding ammonium chloride producing process in serial system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The cold ammonia I mother liquor obtained by absorbing ammonia and cooling the filtered mother liquor of the alkali-making system is sent to two cold crystallizers respectively, and after cold analysis and cooling down to 7 ° C to precipitate ammonium chloride crystallization, then the first cold crystallizer The solid-liquid apparent volume ratio taken out from the inside is 20%, and all the crystal slurry is sent to the first thickener for thickening until the solid-liquid apparent volume ratio is 70%. The thickened crystal slurry is then subjected to solid-liquid separation and The refined ammonium product can be obtained by drying; the washing salt and the clear liquid overflowed from the two cold crystallizers are respectively sent to two salting out crystallizers for salting out and mixing. The sodium ion concentration in the mixed solution is 75tt. Under the action, the mixed liquid further precipitates ammonium chloride crystals, and then the magma with a solid-l...

Embodiment 2

[0012] The cold ammonia I mother liquor obtained by absorbing ammonia and cooling the filtered mother liquor of the alkali-making system is sent to two cold crystallizers respectively, and after cooling down to 12°C to precipitate ammonium chloride crystallization, the first cold crystallizer All the crystal slurry with a solid-liquid apparent volume ratio of 15% taken out from the inside is sent to the first thickener for thickening until the solid-liquid apparent volume ratio is 70%, and the thickened crystal slurry is separated by solid-liquid and drying can produce refined ammonium products; the salt washing and the clear liquid overflowed from two cold crystallizers are sent to two salting crystallizers for salting out and mixing respectively. The sodium ion concentration in the mixed solution is 72tt, and the salt Under the action of analysis, the mixed liquid further precipitates ammonium chloride crystals, and then the crystal slurry with a solid-liquid apparent volume ...

Embodiment 3

[0014] The cold ammonia I mother liquor obtained by absorbing ammonia and cooling the filtered mother liquor of the alkali-making system is sent to two cold crystallizers respectively, and after cold analysis and cooling down to 9 ° C to precipitate ammonium chloride crystallization, then the first cold crystallizer The solid-liquid apparent volume ratio taken out from the inside is 30%, and all the crystal slurry is sent to the first thickener for thickening until the solid-liquid apparent volume ratio is 60%. The thickened crystal slurry is then subjected to solid-liquid separation and The refined ammonium product can be obtained by drying; the washing salt and the clear liquid overflowed from the two cold crystallizers are respectively sent to two salting out crystallizers for salting out and mixing. The sodium ion concentration in the mixed solution is 74tt. Under the action, the mixed liquid further precipitates ammonium chloride crystals, and then the magma with a solid-l...

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Abstract

The ammonium chloride producing process in a serial system includes the following steps: feeding cold ammonia mother liquid into two cooling and separating crystallizers to separate ammonium chloride; densifying the crystal slurry of the first cooling and separating crystallizer, solid-liquid separation and drying to obtain refined ammonium chloride; feeding the clear liquid from washing salt and two cooling and separating crystallizers into two salt-separating crystallizers, densifying crystal slurry from the two salt-separating crystallizers in a second densifier, mixing the densified crystal slurry with cold ammonia in the second cooling and separating crystallizer; mixing, washing and densifying the crystal slurry from the crystallizer and the mother liquid from the first cooling and separating crystallizer in a third-densifier.

Description

technical field [0001] The invention relates to a method for producing ammonium chloride, in particular to a method for producing ammonium chloride in a combined soda production process. Background technique [0002] Compared with the combined process of ammonium chloride production in the traditional combined soda production process, the reverse material process has better operational stability, and more salt can be added to the system, which can reduce the mother liquor equivalent and increase the ammonium chloride yield. At the same time It can provide high-quality alkali-making mother liquor ammonia mother liquor II for the alkali-making process, but its disadvantage is that it cannot produce refined ammonium. The combined process is good at producing refined ammonium while producing agricultural ammonium, but it cannot reflect the above-mentioned advantages of the reverse material process. When the two processes coexist, the total output of am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16
Inventor 张宝祥
Owner TIANJIN BOHUA YONGLI CHEM IND
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