Production of polymerized ferric-aluminum chloride composite coagulating agent

A technology of polyferric aluminum chloride and coagulant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve good stability, cost reduction, and simple process

Inactive Publication Date: 2007-11-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyferric aluminum chloride composite coagulant based on iron salt has not been reported yet
And take pickling waste liquid and calcium aluminate powder as raw material to prepare composite coagulant polyferric chloride aluminum composite coagulant and also have no report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 347.1 g (300 mL) of hydrochloric acid pickling waste liquid with a specific gravity of 1.157 in the reaction kettle, and add 7.7 g of sodium chlorate oxidant in batches under conditions of stirring and a certain temperature (60-75° C.) under normal pressure. Then add 20.0 g of calcium aluminate powder and stir and react for 1.5 to 2.5 hours. Finally, filter while hot, add 7.4g of sodium dihydrogen phosphate stabilizer to the filtrate, stir and dissolve to obtain Fe 2 O 3 The percentage content is 9.30%, Al 2 O 3 The percentage content is 2.72%, the basicity is 4.95%, Fe 2+ Stable polyferric aluminum chloride with a concentration of less than 0.1%.

Embodiment 2

[0023] Weigh 347.1 g (300 mL) of the hydrochloric acid pickling waste liquid with a specific gravity of 1.157 in the reaction kettle, and add 7.7 g of sodium chlorate oxidant in batches under conditions of stirring and a certain temperature (60-75° C.) under normal pressure. Then add 25.0 g of calcium aluminate powder and stir and react for 1.5 to 2.5 hours. Finally, filter while hot, add 23.4g of sodium phosphate stabilizer to the filtrate, stir and dissolve to obtain Fe 2 O 3 The percentage content is 7.78%, Al 2 O 3 The percentage content is 3.34%, the basicity is 6.44%, Fe 2+ Stable polyferric aluminum chloride with a concentration of less than 0.1%.

Embodiment 3

[0025] Take 368.7g (300mL) of hydrochloric acid pickling waste liquid with a specific gravity of 1.229, 74mL of industrial hydrochloric acid and 15mL of distilled water in the reaction kettle, under normal pressure, under stirring and certain temperature (60~75℃), add 8.3g quantitatively in batches Sodium chlorate oxidizer. Then 32.4g calcium aluminate powder is added, and the reaction is stirred for 1.5-2.5 hours. Finally, filter while hot, add 30.6g of sodium phosphate stabilizer to the filtrate, stir and dissolve to obtain Fe 2 O 3 The percentage content is 7.77%, Al 2 O 3 The percentage content is 3.15%, the basicity is 6.17%, Fe 2+ Stable polyferric aluminum chloride with a concentration of less than 0.1%.

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Abstract

Production of inorganic polymer coagulating agent is carried out by controlling Fe2+ concentration between 75-90g / L in hydrochloric acid pickling effluent, taking it as ferric source, taking calcium aluminate powder as aluminum source with Al2O3 content 47-56 wt%, putting two kinds of raw material into reactor in proportion of calcium aluminate powder: hydrochloric acid pickling effluent=0.05-0.10, reacting while agitating at 50-80 degree for 1-3 hrs, adding into minor chlorate oxidant and phosphate stabilizer, heating, reacting while agitating, and cooling to room temperature to obtain final product. It's simple and can be used for domestic sewage and industrial effluent treatment.

Description

Technical field [0001] The invention relates to a method for preparing an inorganic polymer coagulant, in particular to a method for preparing a polyferric aluminum chloride composite coagulant by using hydrochloric acid pickling waste liquid and calcium aluminate powder, and belongs to the technical field of chemistry and chemical engineering. Background technique [0002] In order to improve the surface structure of the steel or process the surface, the corrosion of strong acid is often used to clean the surface of the steel to remove the rust on the surface of the steel. When the cleaning is carried out to a certain level, the acid concentration in the washing solution is reduced, and the acid is washed. The rate slows down, and new acid must be replaced to maintain a proper pickling rate. The effluent of the residual liquid will form a pickling waste liquid containing high concentrations of metal ions and residual acid. Pickling waste liquid generally contains 0.05~5g / L of H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 邱慧琴蓝伟喻艳菁张洁盛伟佳
Owner SHANGHAI UNIV
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