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Method for preparing layered iron oxide green rust in zero-emission mode

An iron oxide, zero-emission technology, applied in the direction of iron compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of increasing raw material costs, energy consumption, subsequent waste water and waste treatment costs, consuming large amounts of water and raw materials, etc., to achieve reduction Strong activity, reduced energy consumption for oxygen removal, simple and cheap synthesis method

Inactive Publication Date: 2021-03-02
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even though the synthesis process is simple and easy, and the raw materials are cheap and easy to obtain, it requires a lot of water and raw materials, and strict anaerobic conditions need to be maintained, which increases the cost of raw materials, energy consumption and subsequent waste water treatment costs of the enterprise.

Method used

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  • Method for preparing layered iron oxide green rust in zero-emission mode
  • Method for preparing layered iron oxide green rust in zero-emission mode
  • Method for preparing layered iron oxide green rust in zero-emission mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Under the condition of anaerobic, room temperature and stirring, adjust the pH of 450mL glycine solution (0.07mol / L) to 8.0 with 1.0mol / L NaOH solution, then add 20mL of FeCl 2 solution (0.5mol / L), and then adjust the pH to 8.0 with 1.0mol / L NaOH solution to obtain a glycine-ferrous iron mixture; 3 The solution (0.1mol / L) was injected into the above-mentioned glycine-ferrous iron mixture at a rate of 5mL / min in four times, and 1mol / L NaOH solution (3mL / min) was added dropwise at the same time to stabilize the pH of the system at 8.0. During the process, the layered iron oxide patina will crystallize and precipitate, and after the dosing is completed, a patina suspension is obtained;

[0040] (2) The green rust suspension that step (1) is made is by centrifugation, and wherein, the rotating speed of centrifugal is 5000rpm, and the time is 3min, obtains concentrated green rust (concentration is 500mM) and supernatant; Supernatant (485mL ) to collect, then add glycine...

Embodiment 2

[0045] (1) Under the condition of anaerobic, room temperature and stirring, adjust the pH of 5400mL glycine solution (0.84mol / L) to 8.0 with 13mol / L NaOH solution, then add 240mL of FeCl 2 solution (2.2mol / L), then adjust the pH to 8.0 with 13mol / L NaOH solution to obtain a glycine-ferrous iron mixture; 3 The solution (2.75mol / L) was injected into the above-mentioned glycine-ferrous iron mixed solution at a rate of 60mL / min four times, and 13mol / L NaOH solution (36mL / min) was added dropwise at the same time to stabilize the pH of the system at 8.0. During the process, the layered iron oxide patina will crystallize and precipitate, and after the dosing is completed, a patina suspension is obtained;

[0046] (2) The green rust suspension that step (1) is made is by centrifugation, and wherein, the rotating speed of centrifugal is 5000rpm, and the time is 3min, obtains concentrated green rust (concentration is 500mM) and supernatant; Supernatant (5820mL ) to collect, then add gl...

Embodiment 3

[0050] (1) Under the condition of anaerobic, room temperature and stirring, adjust the pH of 11250mL glycine solution (1.75mol / L) to 8.0 with 27.25mol / L NaOH solution, then add 500mL of FeCl 2 solution (4.95mol / L), and then adjust the pH to 8.0 with 27.25mol / L NaOH solution to obtain a glycine-ferrous iron mixture; 3 The solution (5.6mol / L) was injected into the above-mentioned glycine-ferrous iron mixed solution at a rate of 125mL / min four times, and 27.25mol / L NaOH solution (60mL / min) was added dropwise at the same time to stabilize the pH of the system at 8.0, During this process, the layered iron oxide green rust will crystallize and precipitate out, and after the dosing is completed, the green rust suspension is obtained;

[0051] (2) the green rust suspension that step (1) is made is by centrifugation, and wherein, the rotating speed of centrifugal is 5000rpm, and the time is 3min, obtains concentrated green rust (concentration is 500mM) and supernatant; Supernatant (121...

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Abstract

The invention relates to the field of preparation of environmental remediation agents, in particular to a method for preparing layered iron oxide green rust in a zero-emission mode. Glycine is used asan auxiliary agent, a large amount of green rust is rapidly synthesized through a homogeneous precipitation method, and zero emission of waste water and waste in the synthesis process is achieved. Glycine, ferric iron and ferrous iron are used as raw materials, green rust is synthesized under the weakly alkaline condition, supernatant and washing liquid in the process are recycled, chemicals areadded, then the mixture is reused in the synthesis process, and zero emission in the production process is achieved. The production process does not generate waste, the raw materials are cheap and easy to obtain, the process is simple and easy to implement, large-scale synthesis can be realized, oxygen-free water is theoretically and completely recycled, the oxygen removal energy consumption is greatly reduced, and the production process has very high practical value and popularization value.

Description

technical field [0001] The invention relates to the field of preparation of environmental remediation agents, in particular to a method for preparing layered iron oxide green rust with zero discharge. Background technique [0002] Patina is a natural iron mineral in nature, which is generally formed in anaerobic alkaline and iron-rich environments. Because Lvxiu itself has chemical reduction activity, it will be immediately oxidized into magnetite, goethite, lepidocite, iron patina or ferrihydrite when exposed to air or other oxidizing agents. Patina is a layered iron oxide containing divalent iron and ferric cations, belonging to the double-layer hydroxide family, and is a thin columnar structure with a hexagonal bottom. Its sandwich structure with layered double hydroxide can adsorb heavy metal ions, organic anions and inorganic ions to form an inner layer complex. In addition, ferrous iron in green rust has a low reduction potential, and it can reduce and remove polluta...

Claims

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Application Information

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IPC IPC(8): C01G49/00C02F1/70C09K17/02C02F103/06
CPCC01G49/00C02F1/70C09K17/02C01P2002/22C02F2103/06
Inventor 殷炜昭陈风敏赵锦欣
Owner JINAN UNIVERSITY
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