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Resin-method recovering technology for electroplating waste acid and diluted acid waste water

A technology for waste acid water and resin, which is applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage treatment and other directions, can solve the problems of high loss rate of main components, difficult operation, low recovery efficiency, etc. The effect of simple process and high recovery rate

Inactive Publication Date: 2017-12-01
上海立科化学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] A sulfuric acid wastewater recycling device disclosed in Chinese Patent Application No. CN201120059688.2, the device removes metal ions through a two-stage nanofiltration process to achieve the purpose of wastewater reuse, and the nanofiltration process is indeed useful for the recycling of sulfuric acid wastewater Good impurity removal effect, but high cost and low treatment efficiency for feed liquid with high impurity concentration, and high loss rate of main components in filtration process
Chinese patent application number CN201310426232.9 discloses a wastewater treatment method for sulfuric acid containing low-concentration metal ions. This method first neutralizes with ammonia water and produces metal salt precipitation, and then removes the sulfuric acid introduced in the system through macroporous adsorption resin. Ammonium salt, the impurity metal ions in the system that do not form precipitation with ammonia water are removed through ion exchange resin, and then recyclable sulfuric acid is obtained through high temperature pyrolysis at 250°C. This method not only introduces ammonia impurities, but also needs to remove ammonia Second, the recovery cost is high, the safety is low, and the removal rate of impurities by macroporous adsorption resin is low
[0004] Dilute acid wastewater with high metal content in electroplating, metallurgy, sulfuric acid production and other industries has high recycling value. Most of the processes and methods reported in Chinese patents and literature have good treatment effect but high cost, or low cost but treatment effect Problems such as poor quality, complex process, difficult operation, and low recovery efficiency are also indirect reasons why dilute acid wastewater is difficult to recycle and reuse
Ion exchange resin has a good effect of removing metal ions in terms of process, operation, safety and environmental protection. However, the high acidity in wastewater and the high concentration of hydrogen ions lead to the metal falling off after exchange and the final treatment capacity is low. Although chelating resin Good selectivity to metal ions, but high production cost

Method used

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  • Resin-method recovering technology for electroplating waste acid and diluted acid waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The first step, filter

[0042] The raw material of this example uses electroplating sulfuric acid wastewater with a mass fraction of 20%, wherein the main impurity aluminum ion concentration is 10-15g / L, and filter paper is used to filter the solid particles in the feed solution.

[0043] The second step, mixed resin to remove metal ions in waste acid water

[0044] (1) Pretreatment of resin

[0045]Mix 90mL of D001SC resin with 10mL of D418 resin and put it into an ordinary glass chromatography column, keeping the aspect ratio of the resin in the chromatography column at (1~7):1. According to the national standard GB / T 5476-2013 and the hydrochloric acid solution used in the national standard GB / T 5476-2013 is replaced by a sulfuric acid solution with a mass fraction of 2.5% to pretreat the mixed resin in the exchange column. That is: use 1mol / L NaOH aqueous solution 5BV (resin column volume) to pass through the resin at a flow rate of 2-5BV / h, wash with 5-15BV deio...

Embodiment 2

[0052] The first step, filter

[0053] In Example 2, use the by-product waste acid water in the sulfuric acid production process—the dilute sulfuric acid waste liquid (waste acid water) with a mass fraction of about 18%, wherein the main impurity aluminum ion concentration is 10~15g / L, use filter paper to filter the waste acid Solid impurities in water.

[0054] The second step, mixed resin to remove metal ions

[0055] (1) Pretreatment of resin

[0056] Mix 85mL of D001AM resin with 15mL of S940 resin and put it into an ordinary glass chromatography column, keeping the height-to-diameter ratio of the resin in the chromatography column at (1-7):1. According to the national standard GB / T 5476-2013 and the hydrochloric acid solution used in the national standard GB / T 5476-2013 is replaced by a sulfuric acid solution with a mass fraction of 2.5% to pretreat the mixed resin in the exchange column. That is: use 5BV of 1mol / L NaOH aqueous solution to pass through the resin at a f...

Embodiment 3

[0063] The first step, filter

[0064] In Example 3, dilute sulfuric acid with a by-product mass fraction of about 20% in the sulfuric acid production process was used for waste acid water, and the impurity aluminum ion concentration was 15g / L, and filter paper was used to filter solid impurities in the feed liquid.

[0065] The second step is to mix the resin to remove metal ions;

[0066] (1) Pretreatment of resin

[0067] Mix 85mL of D001SC resin with 15mL of D401 resin and put it into an ordinary glass chromatography column, keeping the aspect ratio of the resin in the chromatography column at (1-7):1. According to the national standard GB / T 5476-2013 and the hydrochloric acid solution used in the national standard GB / T 5476-2013 is replaced by a sulfuric acid solution with a mass fraction of 2.5% to pretreat the mixed resin in the exchange column. That is: use 5BV of 1mol / L NaOH aqueous solution to pass through the resin at a flow rate of 2 to 5BV / h, wash with 5 to 15BV...

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Abstract

The invention provides a resin-method recovering technology for an electroplating waste acid and diluted acid waste water. The technology comprises two steps: the first step, filtering the discharged waste acid water, and removing solid particle impurities; and the second step, removing a large number of metal ions in the waste water by a mixed resin, enabling the content of the metal ions, such as aluminum, iron, and lead, in sulfuric acid solution to be standard, recovering and recycling. The innovation point of the technology is that the metal ion removal is realized by using the mixed resin and combining the exchange interaction of the metal ions and the chelation action of the metal ions. The technology has the advantages of recycling operation, high recovering efficiency, energy conservation and environmental protection, high safety degree and simple process.

Description

technical field [0001] The invention belongs to the fields of electroplating and chemical industry, and in particular relates to a resin recovery process for electroplating waste acid and dilute acid waste water. Background technique [0002] In the electroplating industry, there are certain requirements for metal ions on the plated parts, so before electroplating, the plated parts will be cleaned with acid to remove metal ions such as iron, aluminum, lead, etc., and the acid solution will be washed away with water. In this method, a large amount of waste acid and washing will be produced. Acid water, and this part of the waste water is mixed to become dilute acid waste water with high metal ion content, which can be recovered and reused to clean the plated parts by reducing or removing the metal ions in it. Sulfuric acid is an important raw material in the chemical and iron and steel industries. It produces a large amount of dilute acid wastewater in the production process,...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/001C02F1/42C02F2001/425C02F2103/16
Inventor 刘庆曾肖亚男黄志石荣珍张芳江
Owner 上海立科化学科技有限公司
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