Process for treating mirabilite liquid

Abstract

The invention discloses a process for treating mirabilite liquid. The process comprises the following steps of: removing mechanical impurities in 35.8 to 36.2 percent original mirabilite liquid which is delivered underground under the monitoring of a DCS automatic monitoring system and the regulation and control of an AK liquid balancing flow meter of which the metering error is between 0.0001 and 0.0002 m<3>/h by using a three to six-stage pipeline filter; and refining and purifying the original mirabilite liquid of which the mechanical purities are removed by using an eight to twelve-stage ion exchanger to prepare mirabilite liquid of which metal ion impurity content is less than 1 ppm so as to obtain refined mirabilite liquid for meeting the production and the application of a variety of mirabilite.

Description

Technical field: [0001] The invention belongs to the field of inorganic chemical finishing. Background technique: [0002] The traditional Glauber's salt water refining process is: the salt water is filtered to remove mechanical impurities, chemical raw materials are added to chemically treat metal ion impurities, and flocculants are added to settle, and then refined salt water is filtered. [0003] In Chinese Patent No. CN101041444A, a method for separating Glauber's salt (sodium sulfate) by freezing and crystallizing in saline solution is introduced. It undergoes pH adjustment, precooling, control of the crystallization temperature at 0-10° C., separation, and recrystallization to make a finished product. The technological process adopted in this method is actually to make saltwater into Glauber's salt containing crystal water first, then remove the free water in Glauber's salt, and finally obtain the production process of Glauber's salt containing crystal water; Glauber'...

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Problems solved by technology

[0006] The purpose of the present invention is to study a treatment process for Glauber's salt water, so that it can overcome the shortcomings of the existing technology for the chemical treatment of metal ion impurities in Glauber's salt water, and have a more ideal unit production capacity under the premise of ensuring high product purity. Under the monitoring of the DCS automatic monitoring system and the regulation of the AK liquid balance flowmeter, the use of multi-stage pipeline filters and multi-stage ion exchangers makes it more conducive to large-scale production; it also overcomes the excessive storage equipment in the production process of Glauber's salt And other shortcomings, so that the production process is shortened by nearly 50%, and under the monitoring of the DCS automatic monitoring system, the concentration of the original nitric water is strictly controlled to ensure the stability of the control conditions of the subsequent process, so the process can be produced on a large scale

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