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Method for separating, purifying and recycling waste hydrochloric acid containing iron

A waste hydrochloric acid, anion technology, applied in chemical instruments and methods, iron halide, oxidized water/sewage treatment, etc., can solve the problem of increasing the salt content of wastewater discharged by enterprises, wasting hydrochloric acid and ferric chloride resources, increasing neutralization treatment costs, etc. problems, to achieve the effect of good adsorption and regeneration performance, saving treatment costs, and reducing neutralization treatment costs

Active Publication Date: 2010-02-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that it not only wastes useful hydrochloric acid and ferric chloride resources, but also increases the cost of neutralization treatment, and at the same time significantly increases the salt content in the wastewater discharged by the enterprise, which directly leads to a substantial increase in the cost of subsequent wastewater treatment
[0005] Literature search shows that although there have been reports on the separation and recovery of ferric ions and high-concentration hydrochloric acid in the washing wastewater in the production process of chlorinated benzene, the separation of high-concentration ferrous ions and low-concentration hydrochloric acid in the waste hydrochloric acid washing solution of iron castings Recovery has not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 10 mL (about 7 grams) of D201 resin into a glass resin column (Ф12×160 mm) with a heating jacket. The 50mL waste hydrochloric pickling liquid of iron castings discharged from the production workshop was brownish yellow and turbid. After filtration, the filtrate was brownish yellow transparent liquid, the concentration of HCl was about 5.5mol / L, and the content of iron ion was about 21000mg / L. 2 o 2 Aqueous solution, stirred at 25°C for 2 hours; 50mL of oxidized iron casting waste hydrochloric pickling solution flows down through the above resin column, the flow rate is 1BV / h, the temperature is 25°C, and the treated effluent is colorless to light yellow Transparent liquid, the concentration of HCl is about 5.5mol / L, and the concentration of iron ion is about 2200mg / L. Industrial concentrated hydrochloric acid can be added to increase the concentration of HCl and then returned to the production process, which can be recycled as hydrochloric acid washing liquid for ir...

Embodiment 2

[0024]100 mL (about 72 grams) of NDA900 resin was loaded into a glass resin column (Ф25×250 mm) with a heating jacket. The 600mL waste hydrochloric pickling liquid of iron castings discharged from the production workshop was brownish-yellow and turbid. After filtration, the filtrate was brownish-yellow transparent liquid, the concentration of HCl was about 6mol / L, and the content of iron ions was about 19000mg / L. NaClO aqueous solution, stirred at 15°C for 1.5h; 600mL of oxidized iron casting waste hydrochloric acid pickling solution was passed through the above resin column downstream, the flow rate was 1.5BV / h, the temperature was 15°C, and the treated effluent was colorless To a light yellow transparent liquid, the concentration of HCl is about 6mol / L, and the concentration of iron ions is about 1500mg / L. Industrial concentrated hydrochloric acid can be added to increase the concentration of HCl and then returned to the production process, which can be recycled as hydrochlor...

Embodiment 3

[0026] 10 mL (about 7.5 grams) of Amberlite IRA-96 resin was loaded into a glass resin column (Ф12×160 mm) with a heating jacket. The 40mL iron casting waste hydrochloric pickling solution discharged from the production workshop was brownish yellow and turbid. After filtration, the filtrate was brownish yellow transparent liquid, the concentration of HCl was about 5mol / L, and the content of iron ion was about 18000mg / L. Add 0.5mL 30% dropwise h 2 o 2 Aqueous solution, stirred at 20°C for 2 hours; 40mL of the oxidized iron casting waste hydrochloric pickling liquid passed through the above resin column downstream, the flow rate was 1.2BV / h, the temperature was 20°C, and the treated effluent was colorless to light Yellow transparent liquid, the concentration of HCl is about 5mol / L, and the concentration of iron ion is about 4500mg / L. Industrial concentrated hydrochloric acid can be added to increase the concentration of HCl and then returned to the production process, which can...

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PUM

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Abstract

The invention discloses a method for separating, purifying and recycling waste hydrochloric acid containing iron, belonging to the field of wastewater treatment. The method comprises the following steps: (A) filtrating with sands to remove suspended matter in iron casting waste hydrochloric acid flushing fluid, dropwise adding oxidant, ensuring the oxidized flushing fluid through a absorption tower filled with strongly alkaline anion exchange resin, adding industrial concentrated hydrochloric acid to increase the concentration of HCl in the treated effluent liquid and returning the obtained solution which is used as iron casting hydrochloric acid flushing fluid to recycle, to the production flow; (B) ensuring distilled water or deionized water used as regenerant through a resin bed to elute the exchanged iron complex genitive ions on the strongly alkaline anion exchange resin and forming high concentration ferric chloride water solution which can be used as purifying agent and is sentback to the production flow to use. In the invention, strongly alkaline anion exchange resin is used for the treatment and resource recovery of iron casting waste hydrochloric acid flushing fluid in the fields such as electroplating, iron and steel and the like so as to realize the complete recycling of hydrochloric acid; water is used as resin regenerant to regenerate resin and generate ferric chloride water solution simultaneously so that water can be used to prepare purifying agent.

Description

technical field [0001] The invention relates to a method for recycling waste acid, more specifically a method for the separation, purification and recycling of waste hydrochloric acid containing iron. A method for the separation, purification and recycling of ions. Background technique [0002] Electroplating, steel and other industries use a large number of iron castings as raw materials. These iron castings often need to be soaked and rinsed with concentrated hydrochloric acid before use to remove surface rust. The waste hydrochloric acid washing liquid is brownish yellow, the concentration of HCl is 5-7mol / L, the content of divalent iron ion is 15000-25000mg / L, and the content of ferric ion is 1000-5000mg / L. According to literature reports and engineering investigations, the treatment of waste hydrochloric acid washing solution for iron castings at home and abroad mainly adopts the method of neutralization and precipitation of lye. The disadvantage of this solution is ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G49/10C02F1/00C02F1/52C23G1/36C25D21/22C02F1/72C02F1/42
Inventor 张炜铭潘丙才吕路潘丙军聂广泽张全兴陈金龙
Owner NANJING UNIV
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