Method for preparing sulfuric acid by utilizing zinc-containing wastewater and NaHS waste liquor in viscose fiber factory

A viscose fiber and waste water technology, applied in chemical instruments and methods, hydrogen sulfide, sulfur compounds, etc., can solve the problems of high cost of waste water treatment, waste of resources, ineffective utilization of zinc-containing waste water and NaHS waste liquid, etc., and achieve a solution Effects of high treatment cost, improved conversion rate, important environmental protection significance and practical value

Active Publication Date: 2019-08-23
赛得利(福建)纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of zinc-containing waste water and NaHS waste liquid produced during the production of viscose fiber that are not efficiently utilized, resource waste and waste water treatment costs are high, the invention provides a method for utilizing zinc-containing waste water and NaHS waste water from a viscose fiber factory. The method of preparing sulfuric acid from liquid can not only treat zinc-containing waste water and NaHS waste liquid at the same time, meet environmental protection requirements, but also prepare sulfuric acid required for viscose fiber production at the same time, which has the advantages of environmental protection and practicality

Method used

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  • Method for preparing sulfuric acid by utilizing zinc-containing wastewater and NaHS waste liquor in viscose fiber factory

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Effect test

Embodiment 1

[0035] Such as figure 1 Shown, a kind of method of utilizing viscose fiber factory zinc-containing waste water and NaHS waste liquid of the present invention to prepare sulfuric acid comprises the following steps carried out in sequence:

[0036] (1) Mixing of zinc-containing waste water and NaHS waste liquid

[0037] The zinc-containing wastewater and the NaHS waste liquid are uniformly mixed and reacted according to the hourly volume flow ratio of 70:1, and the pH value of the mixed reaction system is controlled at 3.5; wherein the zinc-containing wastewater is produced in the production of viscose fiber Zinc-containing wastewater, the NaHS waste liquid is the treatment of H in viscose fiber production 2 The NaHS waste liquid that S gas produces; This zinc-containing waste water comprises the NaSO of mass percent 3% 4 , 1.5% H by mass 2 SO 4 and 0.1% by mass of ZnSO 4 ; NaHS waste liquid comprises the NaHS of mass percentage 21% and the Na of mass percentage 1.8% 2 S; ...

Embodiment 2

[0047] Such as figure 1 Shown, a kind of method of utilizing viscose fiber factory zinc-containing waste water and NaHS waste liquid of the present invention to prepare sulfuric acid comprises the following steps carried out in sequence:

[0048] (1) Mixing of zinc-containing waste water and NaHS waste liquid

[0049] The zinc-containing wastewater and the NaHS waste liquid are uniformly mixed and reacted according to the hourly volume flow ratio of 60:1, and the pH value of the mixed reaction system is controlled at 3; wherein the zinc-containing wastewater is produced in the production of viscose fiber Zinc-containing wastewater, the NaHS waste liquid is the treatment of H in viscose fiber production 2 The NaHS waste liquid that S gas produces; This zinc-containing waste water comprises the NaSO of mass percent 1.5% 4 , mass percentage 2% H 2 SO 4 and 0.05% by mass of ZnSO 4 ; NaHS waste liquid comprises the NaHS of mass percentage 23% and the Na of mass percentage 1% ...

Embodiment 3

[0059] Such as figure 1 Shown, a kind of method of utilizing viscose fiber factory zinc-containing waste water and NaHS waste liquid of the present invention to prepare sulfuric acid comprises the following steps carried out in sequence:

[0060] (1) Mixing of zinc-containing waste water and NaHS waste liquid

[0061] The zinc-containing wastewater and the NaHS waste liquid are uniformly mixed and reacted according to the hourly volume flow ratio of 80:1, and the pH value of the mixed reaction system is controlled at 4; wherein the zinc-containing wastewater is produced in the production of viscose fiber Zinc-containing wastewater, the NaHS waste liquid is the treatment of H in viscose fiber production 2 The NaHS waste liquid that S gas produces; This zinc-containing waste water comprises the NaSO of mass percent 3.5% 4 , 0.5% H by mass 2 SO 4 and 0.15% by mass of ZnSO 4 ; The NaHS waste liquid of present embodiment comprises the NaHS of mass percentage 18% and the Na of ...

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Abstract

The invention relates to a method for preparing sulfuric acid by utilizing zinc-containing wastewater and NaHS waste liquor in a viscose fiber factory. The method sequentially comprises the followingsteps: (1) mixing zinc-containing wastewater and NaHS waste liquor; (2) preparing H2S gas; and (3) preparing the sulfuric acid. The method disclosed by the invention overcomes the defects that the zinc-containing wastewater and NaHS waste liquor produced during the conventional viscose fiber production cannot be effectively utilized and waste of resources and high wastewater treatment cost exist,is capable of simultaneously treating the zinc-containing wastewater and the NaHS waste liquor, meeting environmental protection requirements and simultaneously preparing the sulfuric acid needed by viscose fiber production, and has the advantages of environment friendliness, practicality and the like.

Description

technical field [0001] The invention relates to a method for preparing sulfuric acid by using zinc-containing waste water and NaHS waste liquid of a viscose fiber factory, which is applied in the field of post-treatment of viscose fiber industry production. Background technique [0002] Viscose fiber has many excellent properties such as high hygroscopicity, comfortable wearing, and natural degradation, and has been widely used in various fields such as clothing, decoration, and medical hygiene materials. It is made of natural cellulose (pulp) as the basic raw material, which is made into viscose collagen solution through alkalization and yellowing reaction, and then made by wet spinning. In the production process of viscose fiber, the cellulose xanthate (viscose) in the alkaline solution is decomposed into regenerated cellulose fibers in the acid bath, and zinc sulfate is usually added to the acid bath components to delay the regeneration and facilitate Improve fiber stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/765C01B17/16
CPCC01B17/7655C01B17/165Y02P70/62
Inventor 龙正武谢自云郭巍范海江
Owner 赛得利(福建)纤维有限公司
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