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Granular Schwertmannite and its preparation method and use

A Shishi mineral, granular technology, applied in the field of granular Shishi mineral and its preparation, can solve the problems of difficult recovery, limited application, long synthesis cycle, etc.

Inactive Publication Date: 2014-07-09
周立祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally recognized that the high-temperature hydrolysis of ferric salts to synthesize Shi's minerals, one is the high cost, Fe 2 (SO 4 ) 3 The price of FeSO 4 .7H 2 Dozens or even hundreds of times of O
The second is harsh conditions. To synthesize relatively pure Shi-type minerals, energy consumption is high and time-consuming, because high temperature is required, and the hydrolyzate can only be obtained after dialysis in a dialysis bag with a pore size of 2.4nm for about 30 days. The synthesis cycle is relatively Longer, therefore, the cost of developing Shi's minerals synthesized by this method as adsorption materials for water purification is relatively high
Similarly, it is also a material with fine particles and a powdery appearance. It is also difficult to recycle in water treatment and cannot be directly used in column or bed water treatment devices, which limits its application.

Method used

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  • Granular Schwertmannite and its preparation method and use
  • Granular Schwertmannite and its preparation method and use
  • Granular Schwertmannite and its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The preparation of embodiment 1 granular Shi's minerals

[0034] (1) Weigh the biogenic Schwartz mineral powder 20 prepared according to the method disclosed in ZL200510094428.8 Example 1 g , join in the Erlenmeyer flask that fills the 200mL NaOH solution that pH is 12;

[0035] (2) Place the above Erlenmeyer flask in a shaker at 25°C and 180rpm for 12h;

[0036] (3) Vacuum filter the above solution and wash it with water for 3-5 times until the effluent is nearly neutral, then dry it.

[0037] (4) Adhere 1g of the above-mentioned modified powdered Schwartz minerals to the surface of 250g of zeolite particles with a particle size of about 4mm with glass glue, and dry them in an oven at 50°C to obtain granular Schwartz minerals, small The particle density is 1.195g / cm 3 , and store it in a dry box for later use.

[0038] (5) In order to observe the anti-breaking ability of the particles, add 100mLH 2 O was placed in a 250mL Erlenmeyer flask and shaken in a shaker at...

Embodiment 2

[0040] The preparation of embodiment 2 granular Shi's mineral adsorption columns

[0041] Take by weighing 44g of granular Shi's minerals (prepared in Example 1) and fill them with an internal diameter of 29.3mm and a column height of 118.98mm in a plexiglass column. The glass column is filled with glass fibers of 5mm up and down. The actual adsorbent height is 108mm, and the packing density 0.604g / cm 3 , with a porosity of 49.4%, artificially prepared arsenic-containing groundwater through a peristaltic pump (LDB-M electronic peristaltic pump) at a certain influent flow rate from bottom to top through the adsorption column. figure 2 It is a schematic diagram of the adsorption column test device.

Embodiment 3

[0042] Example 3 The Adsorption and Removal of As(III) and As(V) in Simulated Water by Granular Schwartz Mineral Adsorption Column

[0043] 3.1 Test method

[0044] 3.1.1 Preparation of As(III) and As(V) solutions

[0045] Analytical pure As dried at 110°C for 2 h 2 o 3 Dissolve 0.6595g in 20mL NaOH solution with a mass fraction of 40%, moderately dilute with ultrapure water (>18MΩcm), then adjust the pH of the solution to 7.0 with superior pure hydrochloric acid, and dilute to 500mL, this stock solution As(III) The concentration is 1000mg / L, and it is stored in a refrigerator at 4°C, protected from light.

[0046] Accurately weigh 1.2015g KH 2 AsO 4 In a beaker, add 100mL of ultrapure water (>18MΩcm), dilute HCl to adjust to pH=7.0, and set the volume to 500mL. The As(V) concentration of this stock solution is 1000mg / L, and store in a refrigerator at 4°C in the dark.

[0047] 3.1.2 Influence of the concentration of As(III) in the influent on the removal of arsenic by th...

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Abstract

The invention belongs to the field of environmental engineering and discloses granular Schwertmannite and its preparation method and use. The granular Schwertmannite comprises particles which are prepared by loading specific carriers with NaOH solution-modified biogenic Schwertmannite on carrier surfaces and have an average particle size of 4.06mm. The surface of the granular Schwertmannite is covered with reddish-brown Schwertmannite so that the granular Schwertmannite can maximumly contact with pollutants and can resist flow-velocity dynamic water flow impact. The surface of each zeolite is loaded with about 3.7mg of Schwertmannite so that mineral high-adsorption performances can be maximumly used. The granular Schwertmannite has a pellet shape and is convenient for As recovery and regeneration.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and relates to a granular Shi's mineral and its preparation method and application. Background technique [0002] Biogenic Shi's minerals refer to the use of chemoautotrophic microorganisms Acidithiobacillus ferrooxidans (A.ferrooxidans for short) to catalyze the oxidation of FeSO under acidic conditions. 4 .7H 2 After O, Fe 3+ The hydroxy iron sulfate mineral Schwertmainnte (ie Schwertmainnte) with poor crystallinity formed by further hydrolysis has a molecular formula of Fe 8 o 8 (OH) 6 SO 4 . Different from the chemically synthesized Shi's minerals, the biogenic Shi's minerals have attracted the attention of the industry because of their significant advantages such as direct adsorption of As(III), large adsorption capacity, and adsorption performance is almost not affected by other competing ions in the water (Liao Yuehua, 2008 ; Xie Yue, 2009; Li Zheying, 2010). Previous studi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/16B01J20/30
Inventor 周立祥李浙英梁剑茹
Owner 周立祥
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