Device and method for treating byproduct mirabilite of viscose factory

Abstract

The invention belongs to the technical field of solid waste treatment processes, and particularly relates to a device and a method for treating byproduct mirabilite of a viscose factory. The device comprises a blending tank, a first delivery pump, a pH regulating tank, a settling pond, a second delivery pump, a filter, bipolar membrane electrodialysis equipment, a third delivery pump, an alkali chamber storage tank, a salt chamber storage tank, an acid chamber storage tank, a second reflux pump, a third reflux pump, a fourth reflux pump, a sixth delivery pump and a dirt discharge pipeline, wherein the settling pond is arranged below the pH regulating tank. The method for treating mirabilite comprises the following steps: mixing mirabilite and soft water in a dissolving pool, removing impurities from the mixed solution through the impurity removal operation of the pH regulating tank, the settling pond and the filter, electrolyzing by using the bipolar membrane electrodialysis equipment,and completing the treatment of the sodium sulfate of the filtrate in the salt chamber when the electric conductivity of the filtrate in the salt chamber of the bipolar membrane electrodialysis equipment is less than or equal to 20 mS / cm, so that the emission standard is reached.

Description

technical field

[0001] The invention belongs to the technical field of solid waste treatment technology, and in particular relates to a device and method for treating mirabilite, a by-product of a viscose factory. Background technique

[0002] Glauber's salt is a sulfate mineral Glauber's salt family Glauber's salt, mainly containing hydrous sodium sulfate (Na 2 SO 4 10H 2 O). In the production of viscose fiber, a large amount of thenardite will be produced incidentally. The specific production process is that the viscose solution is ejected from the spinneret and contacts the coagulation bath, so that the viscose solution reacts chemically with the sulfuric acid in the coagulation bath to produce sodium sulfate. As the production progresses, the sulfuric acid content in the coagulation bath decreases and the sodium sulfate content increases. Therefore, the coagulation bath needs to separate out the excess sodium sulfate in the form of cold crystallization, and then ret...

Examples

Embodiment 2

[0065]The difference from Example 1 is that in the specific treatment process of Glauber's salt, Glauber's salt and soft water are added into the dissolution tank 1 at a mass ratio of 1:5 to obtain a mixed solution.

Embodiment 3

[0067] In the specific treatment process of Glauber's salt, in step A, add Glauber's salt and soft water into the dissolution tank 1 according to the mass ratio of 1:7.8 to obtain a mixed solution.

technical field

[0001] The invention belongs to the technical field of solid waste treatment technology, and in particular relates to a device and method for treating mirabilite, a by-product of a viscose factory. Background technique

[0002] Glauber's salt is a sulfate mineral Glauber's salt family Glauber's salt, mainly containing hydrous sodium sulfate (Na 2 SO 4 10H 2 O). In the production of viscose fiber, a large amount of thenardite will be produced incidentally. The specific production process is that the viscose solution is ejected from the spinneret and contacts the coagulation bath, so that the viscose solution reacts chemically with the sulfuric acid in the coagulation bath to produce sodium sulfate. As the production progresses, the sulfuric acid content in the coagulation bath decreases and the sodium sulfate content increases. Therefore, the coagulation bath needs to separate out the excess sodium sulfate in the form of cold crystallization, and then ret...

Examples

Embodiment 2

[0065]The difference from Example 1 is that in the specific treatment process of Glauber's salt, Glauber's salt and soft water are added into the dissolution tank 1 at a mass ratio of 1:5 to obtain a mixed solution.

Embodiment 3

[0067] In the specific treatment process of Glauber's salt, in step A, add Glauber's salt and soft water into the dissolution tank 1 according to the mass ratio of 1:7.8 to obtain a mixed solution.

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