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 the effects of reducing production costs, improving environmental value, and stabilizing quality

Inactive Publication Date: 2009-10-28
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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  • Production of polymerized ferric-aluminum chloride composite coagulating agent
  • Production of polymerized ferric-aluminum chloride composite coagulating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 347.1 g (300 mL) of hydrochloric acid pickling waste liquid with a specific gravity of 1.157 in a reaction kettle, and under normal pressure, add 7.7 g of sodium chlorate oxidant quantitatively in batches under conditions of stirring and a certain temperature (60-75° C.). Then add 20.0 g of calcium aluminate powder, and stir for 1.5 to 2.5 hours. Finally, filter while it is hot, add 7.4g 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+ Stabilized polyferric aluminum chloride at concentrations below 0.1%.

Embodiment 2

[0022] Weigh 347.1 g (300 mL) of hydrochloric acid pickling waste liquid with a specific gravity of 1.157 in a reaction kettle, and under normal pressure, add 7.7 g of sodium chlorate oxidant quantitatively in batches under conditions of stirring and a certain temperature (60-75° C.). Then add 25.0 g of calcium aluminate powder, and stir for 1.5 to 2.5 hours. Finally, filter while it is 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+ Stabilized polyferric aluminum chloride at concentrations below 0.1%.

Embodiment 3

[0024] 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, add 8.3g in batches quantitatively under the conditions of stirring and a certain temperature (60-75°C). Sodium Chlorate Oxidizer. Then add 32.4g of calcium aluminate powder, and stir for 1.5 to 2.5 hours. Finally, filter while it is 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+ Stabilized polyferric aluminum chloride at concentrations below 0.1%.

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Abstract

The invention relates to a preparation method of an inorganic polymer coagulant, in particular to a preparation method of 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. The present invention is characterized in that: according to the free acid content and iron content of the hydrochloric acid pickling waste liquid, the Fe2+ concentration is controlled to be 75~90g / L, and it is used as the iron source; calcium aluminate powder is used as the aluminum source, wherein The content of Al2O3 is 47-56%; the mass ratio of calcium aluminate powder and hydrochloric acid pickling waste liquid is 0.05-0.10, put the two raw materials into the reactor, and stir and react at 50-80°C for 1- 3 hours; add a small amount of chlorate oxidant and phosphate stabilizer during the reaction; heat and stir for reaction, and after the reaction is completed, cool to room temperature to obtain a liquid polyferric aluminum chloride composite coagulant. This product is mainly used for the purification treatment of domestic sewage and industrial wastewater. The process of the invention is simple, and it opens a way for the comprehensive utilization of hydrochloric acid pickling waste liquid.

Description

technical field [0001] The invention relates to a preparation method of an inorganic polymer coagulant, in particular to a preparation method of 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 steel or process the surface, the corrosion of strong acid is often used to clean the steel surface to remove the rust on the steel surface. The rate slows down, and new acid must be replaced to maintain an appropriate pickling speed, and the residual liquid is discharged to 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 + and 60-250g / L Fe 2+ , my country's annual discharge of pickling waste liquid is nearly one million cubic meters. Because pickling waste...

Claims

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Application Information

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Patent Type & Authority Patents(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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