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Composite inorganic polymeric sludge dehydration conditioner prepared from blast-furnace metallurgical slag

A technology of inorganic polymer and blast furnace metallurgical slag, which is applied in the direction of dehydration/drying/thickened sludge treatment, which can solve the problems of inconvenient treatment, large volume and high moisture content

Inactive Publication Date: 2012-07-04
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The sludge discharged from municipal sewage plants after sewage treatment is extremely inconvenient due to its extremely high water content and huge volume.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take an appropriate amount of slag powder that has passed through a 100-mesh sieve and activated at 500°C for 1 hour, slowly add 10% dilute hydrochloric acid to it, stir under the mixer at a speed of 40r / min, and after stirring for 1 hour, filter the filtrate for later use; Add a sodium hydroxide solution with a concentration of 1.5 mol / L to the filtered filter residue, put it in a water bath constant temperature oscillator and oscillate at a medium speed at 40°C, take it out after 2 hours of reaction, add pure water to dilute 3 times, and dissolve the dissolved The pH of the filter residue was adjusted with hydrochloric acid and stirred rapidly until the pH was adjusted to 4.8, and then left to stand for 4 hours. Mix the spare filtrate and the solution obtained after the filter residue is treated with alkaline solution at 45°C in a volume ratio of 1:1, and stir continuously. After mixing evenly, let it stand and age for 24 hours to obtain the composite inorganic polymer...

Embodiment 2

[0019] Take an appropriate amount of slag powder that has passed through a 150-mesh sieve and activated at 600°C for 1.5 hours, slowly add 15% dilute hydrochloric acid to it, stir under the mixer at a speed of 60r / min, and after stirring for 1.5 hours, filter the filtrate for later use; Add a potassium hydroxide solution with a concentration of 2 mol / L to the filtered residue, put it in a water bath constant temperature oscillator and oscillate at a medium speed at 50°C, take it out after 3 hours of reaction, add pure water to dilute 3 times, and dissolve the filtered residue Adjust the pH with hydrochloric acid and stir rapidly until the pH is adjusted to 5.0, and let stand for 6 hours. Mix the spare filtrate and the solution obtained after the filter residue is treated with an alkaline solution at 55°C in a volume ratio of 1:1.25, and stir continuously. After mixing evenly, stand and age for 36 hours to obtain the composite inorganic polymer sludge dehydration conditioner. ...

Embodiment 3

[0022] Take an appropriate amount of slag powder that has passed through a 200-mesh sieve and activated at 700°C for 2 hours, slowly add 20% dilute hydrochloric acid to it, stir it under the mixer at a speed of 80r / min, and after stirring for 2 hours, filter the filtrate for later use; Add a mixed solution of sodium hydroxide and potassium hydroxide with the same volume and concentration of 2.5mol / L to the filtered filter residue, put it in a water bath constant temperature oscillator and shake it at a medium speed at 60°C, take it out after 4 hours of reaction, add Dilute 3 times with pure water, adjust the pH of the dissolved filter residue with hydrochloric acid, and stir quickly, adjust the pH to 5.2, and let it stand for 8 hours. Mix the standby filtrate and the solution obtained by treating the filter residue with an alkaline solution at 65°C in a volume ratio of 1:1.5, and stir continuously. After mixing evenly, let it stand and age for 48 hours to obtain the composite i...

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Abstract

The invention belongs to the field of resource utilization of solid waste, namely blast-furnace metallurgical slag, and particularly relates to a composite inorganic polymeric sludge dehydration conditioner which is mainly prepared from the blast-furnace metallurgical slag discharged after steel enterprises smelt iron. The solid waste, namely the blast-furnace metallurgical slag is taken as a main raw material of the prepared composite inorganic polymeric sludge dehydration conditioner; and by fully utilizing elements such as Si, Al, Ca, Mg and Fe in the blast-furnace metallurgical slag, particularly the Ca element, the disadvantage that the blast-furnace metallurgical slag cannot be fully utilized because the Ca element is required to be removed when a flocculant is prepared from the blast-furnace metallurgical slag in some methods is overcome. The Ca element can achieve a framework effect in sludge conditioning to ensure that flocs cannot be crushed easily and the sludge is convenient to dehydrate, so the Ca element is an effective element in the prepared composite inorganic polymeric sludge dehydration conditioner.

Description

technical field [0001] The patent of the invention belongs to the field of resource utilization of blast furnace metallurgical slag, and relates to the synthesis of a composite inorganic polymer sludge dehydration conditioner by using blast furnace metallurgical slag as the main raw material, which is used for dehydration conditioning of municipal sewage plant sludge. Background technique [0002] Blast furnace metallurgical slag is the waste slag discharged by iron and steel enterprises when iron ore is used to smelt pig iron. If it is not treated in time, a large amount of metallurgical slag will occupy a large amount of land, cause environmental pollution, and affect the normal development of enterprises. It does not conform to the concept of a conservation-oriented society . [0003] The main components of blast furnace slag are flux, gangue in ore, ash in fuel, etc. Most of these non-volatile substances exist in the form of aluminates and silicates. Therefore, the comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 于衍真谭娟冯岩程磊索宁高隆隆杨奥
Owner UNIV OF JINAN
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