Process for preparing calcium chloride solution by utilizing ammonia soda filtration mother liquor

The technology of a calcium chloride solution and a processing method is applied in the technical field of preparing a calcium chloride solution by filtering a mother liquor with ammonia and alkali, and can solve the problems of high cost, difficulty in raw materials of high-concentration calcium solution, inability to prepare calcium chloride, etc. The effect of saving land

Active Publication Date: 2011-08-10
大连大化工程设计有限公司 +1
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Problems solved by technology

[0011] The second idea of ​​technicians for waste liquid treatment is to recycle the waste liquid to its own alkali-making system for use. Although the problem of waste liquid utilization has been solved, calcium chloride cannot be prepared. Therefore, the ammonia-alkali waste in the existing process is The preparation of calcium chloride by liquid recovery method is the main process for preparing calcium chloride
However, the method for preparing calcium chloride is to directly evaporate the distil

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  • Process for preparing calcium chloride solution by utilizing ammonia soda filtration mother liquor
  • Process for preparing calcium chloride solution by utilizing ammonia soda filtration mother liquor

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Embodiment Construction

[0027] Below in conjunction with specific embodiment, the technical method of utilizing ammonia alkali to filter mother liquor to prepare calcium chloride solution described in the present invention is explained in detail.

[0028] The process for preparing calcium chloride solution by filtering mother liquor with ammonia alkali according to the present invention is an improvement to the traditional method of preparing soda ash by using distillation waste liquid to prepare calcium chloride. The alkali making process is the same as the traditional process:

[0029] 1. Refined brine: because the sodium chloride solution used contains C a 2+ , M g 2+ They will generate other insoluble double salts such as calcium carbonate during the ammoniation or carbonation process, which will block equipment and pipelines and affect heat transfer and product quality. Therefore, these impurities must be removed before the brine enters the ammonia absorption tower. Its refining method is t...

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Abstract

The invention discloses a process for preparing a calcium chloride solution by utilizing ammonia soda filtration mother liquor and relates to the field of the production method of calcium chloride. The process comprises the following steps: distilling the filtration mother liquor to obtain mother liquor without ammonia, performing triple effect evaporation and separation to the obtained mother liquor to obtain an ammonium chloride saturated solution, then using the ammonium chloride saturated solution to react with lime powder in a reactor and generate a calcium chloride solution, and finally purifying the calcium chloride solution to prepare the finished product-calcium chloride solution. By adopting the process, the soda-calcium production can be realized under the premise of ensuring the recovery and recycling of ammonia and carbon dioxide and the content of the calcium chloride solution is more than 30wt%.

Description

technical field [0001] The invention relates to the field of production methods of calcium chloride, in particular to a method for preparing calcium chloride by filtering mother liquor in ammonia-alkali alkali production, that is, a process for preparing calcium chloride solution by using ammonia-alkali to filter mother liquor. Background technique [0002] As the largest producer of soda ash in the world, my country has implemented three production methods of ammonia-soda method, combined soda method and trona method, and a strategy of joint development of various technologies, which has promoted the transformation from a country with a large output to a country with a strong technology. The production of soda ash by the combined soda method occupies a large proportion in my country. Its advantage is that the waste liquid discharge problem of the ammonia-soda method is solved through the co-production of ammonium chloride. With the increase of production, it became increasin...

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Application Information

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IPC IPC(8): C01F11/24C01D3/04C01F11/32
CPCY02P20/129
Inventor 杜维刚韩立山任明秋唐琳呼日查
Owner 大连大化工程设计有限公司
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