NEWS CENTER

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2024

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07

The process of waste acid regeneration membrane elutriation in acid washing of quartz sand

Author：

The recycling of waste acid from acid washing of quartz sand is an important subject involving environmental protection and resource recycling. As an advanced separation technology, membrane chromatography has significant advantages in the reuse of waste acid. The following is a detailed analysis of the membrane chromatography process for the recycling of waste acid from pickling quartz sand:

First, the necessity of recycling waste acid
Quartz sand pickling process will produce a large number of acidic substances (such as oxalic acid, hydrofluoric acid, etc.) waste water, these waste water if directly discharged, not only will cause serious pollution to the environment, but also waste valuable resources. Therefore, the recycling of waste acid not only meets the requirements of environmental protection, but also realizes the effective recovery of resources.

Second, membrane analysis process introduction
Membrane chromatography is a method of selective separation, concentration or purification of solute or solvent in solution by using semi-permeable membrane. In the waste acid regeneration and utilization, membrane evolution process - electrodialysis method: under the action of direct current electric field, the selective permeability of Yin and cation exchange membrane to the medium Yin and cation of the solution is used to separate the solute in the solution from the water. The electrodialyzer is composed of a series of small water chambers separated by positive and negative membranes, which realizes the directional migration and separation of ions by electric field.

Third, membrane analysis process

Wastewater collection and pretreatment: The wastewater generated during the pickling process of quartz sand is first collected, and the preliminary pretreatment steps such as homogenizing mixing and adjusting pH value are carried out to ensure the stability and efficiency of the subsequent treatment process.

Membrane analysis treatment:

Electrodialysis treatment: the pre-treated wastewater is sent to the electrodialyzer to realize the directional migration and separation of ions under the action of electric field. The water chamber with reduced ions becomes a fresh water chamber, and the effluent can be used as acid for recycling. The water chamber with increased ions becomes a concentrated water chamber, and its effluent needs further treatment.
Post-treatment and recycling: The regenerated acid after membrane chromatography may still contain a small amount of impurities or do not meet the standards for direct use, so further post-treatment (such as neutralization, filtration, etc.) is required to meet the production requirements. The treated regenerated acid solution can be reused in the quartz sand pickling process or other industrial processes that require acidic media.

To sum up, the membrane evolution process has significant advantages and application prospects in the reclamation and utilization of waste acid from pickling of quartz sand. Through scientific and reasonable treatment technology and strict operation management, the effective recycling and resource recovery of waste acid can be realized.

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