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Salt and alkali combined preparation process based on ammonia-soda method

A technology of joint preparation and ammonia-alkali method, which is applied in the preparation/separation of ammonia, ammonia compounds, carbonate preparations, etc., to achieve the effects of saving production costs, huge economic benefits, and reducing environmental pollution

Inactive Publication Date: 2019-02-19
湖北云应矿业技术开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the processes of alkali making and salt making are not independent processes. How to comprehensively utilize their respective wastes is an important issue for industrial development.

Method used

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  • Salt and alkali combined preparation process based on ammonia-soda method
  • Salt and alkali combined preparation process based on ammonia-soda method

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] The invention provides a combined salt-alkali preparation process based on the ammonia-alkali method, such as figure 1 shown, including the following steps:

[0028] Step 1, adding part of Glauber's salt-type brine to saturated Glauber's salt-type brine, denitrification and refining to obtain refined salt brine;

[0029] Step 2, feed ammonia to saturation in the refined salt brine, and feed carbon dioxide, react to generate sodium bicarbonate and ammonium chloride mother liquor, NH 3 +CO 2 +H 2 O=NH 4 HCO 3 , NaCl+NH 4 HCO 3 =NaHCO 3 ↓+NH 4 Cl;

[0030] Step 3, the sodium bicarbon...

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Abstract

The invention belongs to the technical field of salt and alkali industry preparation, and discloses a salt and alkali combined preparation process based on an ammonia-soda method. The preparation process includes the steps: removing nitrate and refining the nitrate; leading in ammonia gas to reach saturation, and leading in carbon dioxide; filtering out crystals and calcining the crystals; addingacetylene sludge into mother liquor, and distilling ammonia; pouring the mother liquor into a salt well; extracting brine and preparing salt. The preparation process has the advantages that alkali preparation of the ammonia-soda method and a well slat preparation process are combined, recyclable comprehensive utilization of waste residue and waste liquid is achieved, environmental pollution is greatly reduced, production cost is greatly reduced, and huge economic benefits are brought.

Description

technical field [0001] The invention relates to the technical field of salt and alkali industrial preparation, in particular to a combined salt-alkali preparation process based on ammonia-alkali method. Background technique [0002] The ammonia-soda method is widely used as the main method of making alkali, and only half of the raw material is used, that is, the Na in table salt + and CO in lime 3 2- , the combination of the two forms soda ash. The fraction of the other half in the raw material, i.e. Cl in table salt - and Ca in lime 2+ Combined calcium chloride generated, not used. Calcium chloride is left in a large amount in the form of solution, and this calcium chloride solution is ammonia alkali waste liquid (or waste clear liquid). [0003] Due to the large discharge of ammonia-alkali waste liquid in the process of making alkali, and the high content of calcium chloride and sodium chloride, although the current environmental protection standards do not have calc...

Claims

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Application Information

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IPC IPC(8): C01C1/02C01D3/06C01D7/18C01F11/24
CPCC01C1/026C01D3/06C01D7/18C01F11/24
Inventor 彭美凡蒋向阳阮坚李治高
Owner 湖北云应矿业技术开发有限公司
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