A kind of recovery processing method of aluminum-containing waste hydrochloric acid

A technology for recovery and treatment of hydrochloric acid, which is applied in the chemical industry to achieve the effects of good adsorption and regeneration performance, simple operation, and high mechanical strength

Active Publication Date: 2016-01-20
NANTONG STAR GRAPHITE EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of recycling method of aluminum-containing waste hydrochloric acid, to solve the unresolved problems in the above-mentioned prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of recycling method of aluminum-containing waste hydrochloric acid:

[0022] (1) 12L of waste hydrochloric acid solution with a hydrochloric acid content of 16% and an aluminum ion content of 25% was sand-filtered to remove suspended solids;

[0023] (2) Under the conditions of operating temperature of 50°C and flow control of 120L / min, ion exchange is carried out through an anion exchange resin tower with a strong basic group of -NR3OH, and the HCl content in the effluent after treatment is 8%. , Aluminum ion content is 6%;

[0024] (3) Collect the effluent treated in step 2 into the sedimentation tank, add 1L of peracetic acid oxidant for oxidation, and set the oxidation time to 4 hours;

[0025] (4) Add 1L of magnesium sulfite precipitant to the oxidizing solution treated in step 3 for precipitation, and press filter to obtain aluminum sludge, and set the precipitation time to 2 hours.

[0026] According to the treatment method of this embodiment, the conten...

Embodiment 2

[0028] A kind of recycling method of aluminum-containing waste hydrochloric acid:

[0029] (1) 12L of waste hydrochloric acid solution with a hydrochloric acid content of 14% and an aluminum ion content of 30% was sand-filtered to remove suspended solids;

[0030] (2) Under the conditions of an operating temperature of 45°C and a flow rate of 100 L / min, the ion exchange is carried out through an anion exchange resin tower whose strong basic group is a quaternary ammonium group, and the HCl content in the effluent after treatment is 10 %, aluminum ion content is 8%;

[0031] (3) Collect the effluent treated in step 2 into the sedimentation tank, add 1L of peracetic acid oxidant for oxidation, and set the oxidation time to 2 hours;

[0032] (4) Add 1L of magnesium sulfite precipitant to the oxidizing solution treated in step 3 for precipitation, and press filter to obtain aluminum sludge, and set the precipitation time to 2 hours.

[0033] According to the treatment method of ...

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PUM

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Abstract

The invention discloses a method for recovering aluminum-containing waste hydrochloric acid. The specific steps are as follows: (1) The waste hydrochloric acid solution with a hydrochloric acid content of 14-20% and an aluminum ion content of 15-30% is sand-filtered to remove solid suspended matter (2) Under the conditions of operating temperature of 45-50°C and flow control of 100-120L / min, ion exchange is carried out by entering the anion exchange resin tower, (3) Collect the effluent treated in step 2 to the precipitate Add an oxidant to the tank for oxidation, (4) add a precipitant to the oxidized solution treated in step 3 for precipitation, and press filter to obtain aluminum sludge. The present invention adds an oxidant and a precipitant to precipitate aluminum ions into aluminum sludge, and the aluminum sludge can be further used as raw materials for other productions. Compared with the neutralization and precipitation methods in the prior art, it not only has simple operation, simple equipment, and significant Reduce the salt content of the enterprise's comprehensive wastewater, and realize the economic benefits of waste reuse are quite obvious.

Description

technical field [0001] The invention relates to a method for recycling waste hydrochloric acid, in particular to a method for recycling and treating aluminum-containing waste hydrochloric acid, which belongs to the technical field of chemical industry. Background technique [0002] Hydrochloric acid is an important inorganic chemical product, widely used in dyestuffs, organic synthesis, food processing, printing and dyeing, rinsing, leather, metallurgy, steel and other industries. A pickling unit with an annual output of 450,000 tons of cold-rolled steel plates needs about 20,000 tons of hydrochloric acid per year, and generates nearly 20,000 tons of hydrochloric acid-containing waste liquid (about 5% hydrochloric acid, 10%-12% ferrous chloride). In chemical production, the hydrochloric acid-containing wastewater produced every year, especially the waste hydrochloric acid solution containing aluminum, cannot be counted. If these waste acids are discharged directly, it will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C01B7/07
Inventor 钱园姚培军
Owner NANTONG STAR GRAPHITE EQUIP CO LTD
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