Method for recovering aluminum salt coagulant from aluminum-containing sludge

A technology of aluminum sludge and coagulant, which is applied in the direction of sludge treatment, pyrolysis treatment of sludge, chemical instruments and methods, etc. Low coagulant recovery rate and other problems, to achieve the effect of wide application range, good coagulation effect, and better quality

Inactive Publication Date: 2020-04-07
上海净屹环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aluminum is an amphoteric metal, which can be dissolved in both acidic and alkaline conditions. At present, the acidification or alkalization method is often used to recover aluminum salt coagulant from aluminum-containing sludge, but the acidification or alkalization method alone The amount of acid or alkali needed to recover aluminum salt coagulant from sludge is relatively large, the recovery rate of coagulant is low, and the coagulation effect of the recovered coagulant is not good in actual use

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  • Method for recovering aluminum salt coagulant from aluminum-containing sludge
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Embodiment 1

[0027] A method for recovering aluminum salt coagulant from aluminum-containing sludge, the steps are:

[0028] (1) the alumina content is 34wt.%, the Fe content is 60mg / kg aluminum-containing sludge (aluminum-containing sludge is taken from the air flotation sludge of the sewage treatment station of an APG manufacturer in Shanghai) from the hopper through the screw conveying pipe Enter the high-temperature anaerobic pyrolysis system in the middle, and then heat up to 850°C at a rate of 75°C / h in an oxygen-free environment, and then pyrolyze for 30 minutes;

[0029] (2) The hot gas produced by the thermal cracking reaction is condensed by the condensing device and then burned, wherein the heat released during the condensation process of the hot gas and the heat released during the combustion process are reused for the high-temperature thermal cracking reaction; The alumina-containing solid particles are acidified and dissolved with hydrochloric acid, and the acidified solution...

Embodiment 2

[0033] A method for recovering aluminum salt coagulant from aluminum-containing sludge, the steps are:

[0034] (1) The aluminum-containing sludge with an alumina content of 28wt.% and a Fe content of 100mg / kg (aluminum-containing sludge is obtained from a certain river water purification plant in Shanghai) enters the high-temperature sludge from the hopper through a spiral conveying pipe. Anaerobic pyrolysis system, and then heat up to 750°C at a rate of 50°C / h in an oxygen-free environment, and then a pyrolysis reaction occurs, and the reaction time is 60 minutes;

[0035] (2) The hot gas produced by the thermal cracking reaction is condensed by the condensing device and then burned, wherein the heat released during the condensation process of the hot gas and the heat released during the combustion process are reused for the high-temperature thermal cracking reaction; The alumina-containing solid particles are acidified and dissolved with hydrochloric acid, and the acidified...

Embodiment 3

[0039] A method for recovering aluminum salt coagulant from aluminum-containing sludge, the steps are:

[0040] (1) The aluminum-containing sludge with an alumina content of 32wt.% and a Fe content of 60mg / kg (aluminum-containing sludge from a thermal power plant in Shanghai) enters the high-temperature anaerobic heat sink from the hopper through a spiral conveying pipe. Cracking system, and then heat up to 1350°C at a rate of 100°C / h in an oxygen-free environment, and then a thermal cracking reaction occurs, and the reaction time is 20 minutes;

[0041] (2) The hot gas produced by the thermal cracking reaction is condensed by the condensing device and then burned, wherein the heat released during the condensation process of the hot gas and the heat released during the combustion process are reused for the high-temperature thermal cracking reaction; The alumina-containing solid particles are acidified and dissolved with hydrochloric acid, and the acidified solution is obtained...

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Abstract

The invention discloses a method for recovering an aluminum salt coagulant from aluminum-containing sludge, and belongs to the technical field of sludge treatment. The method comprises the following steps: firstly, conveying aluminum-containing sludge to a high-temperature oxygen-free thermal cracking system, and carrying out thermal cracking reaction under a high-temperature oxygen-free condition; secondly, acidifying and dissolving aluminum oxide-containing solid particles generated by the thermal cracking reaction by adopting hydrochloric acid, and filtering out insoluble substances to obtain an acidolysis solution; thirdly, adding an alkaline agent into the acidolysis solution to adjust the pH value of the system to be greater than 12, and filtering out insoluble substances to obtain asodium aluminate solution; and finally, adding hydrochloric acid into the sodium aluminate solution to adjust the pH value of the system to 1-2 to form a solution with polymerized soluble aluminum salt, and concentrating or drying the solution to obtain the aluminum salt coagulant. According to the method, the aluminum salt in the aluminum-containing sludge can be recovered and reused, and the aluminum salt coagulant is high in recovery rate and good in use effect.

Description

technical field [0001] The invention specifically relates to a method for recovering an aluminum salt coagulant from aluminum-containing sludge, and belongs to the technical field of sludge treatment. Background technique [0002] As ecological civilization is deeply rooted in the hearts of the people, the environmental governance industry has penetrated into all walks of life. Due to the wide source of raw materials and simple preparation process, aluminum-based coagulants are widely used in water supply treatment, industrial wastewater treatment, sludge treatment, solidification treatment and other fields. However, the use of aluminum-based coagulants to treat water will inevitably cause secondary pollution, that is, the treatment of aluminum-containing sludge generated as a result of the treatment. According to the "List of Hazardous Waste Management of the People's Republic of China" and the "Solid Waste Prevention Law of the People's Republic of China", domestic author...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/00C02F1/52
CPCC02F1/5236C02F11/00C02F11/10
Inventor 黄海君王海峰刘星王龙王玉欢
Owner 上海净屹环保科技有限公司
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