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Preparation method and application of low-grade attapulgite modified material

A technology of attapulgite and modified materials, applied in the directions of application, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of low utilization rate of low-grade attapulgite, etc., and achieve the effect of improving pH value

Active Publication Date: 2019-08-06
YIBIN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above-mentioned problem of low utilization rate of low-grade attapulgite, the present invention provides a preparation method and application of low-grade attapulgite modified material, through physical activation and surface modification (thermal activation, acid treatment, organic modification The attapulgite-based composite restoration agent has been developed by methods such as attapulgite-based restoration. It has strong adsorption and (or ) forms insoluble mineral salts, making them unavailable to crops, thereby blocking their transformation into crops and reducing their biological toxicity without removing heavy metal ions such as cadmium from the soil, and such Clay minerals have been proven to have good water and fertilizer retention properties, and can ultimately achieve the purpose of pollution control and ecological restoration

Method used

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  • Preparation method and application of low-grade attapulgite modified material
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  • Preparation method and application of low-grade attapulgite modified material

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1, the preparation method of low-grade attapulgite modified material

[0053] The preparation method of the low-grade attapulgite modified material comprises the following steps:

[0054] (1) Attapulgite clay pretreatment: After the low-grade attapulgite clay raw ore is crushed, crushed, and ground through a 100-mesh sieve, soak in distilled water for 24 hours at a soil-water ratio of 200g / L; Stir at 600r / min for 5h, let stand to separate layers, separate the sediment at the bottom, dry the attapulgite clay slurry at 105°C to obtain a dry sample; grind it through a 100-mesh sieve and save it for later use.

[0055] (2) Ethylenediamine modification reaction:

[0056] Use 1%-15% (v / v) ethylenediamine solution and natural attapulgite as the solvent, mix them according to the solid-to-liquid ratio of 50-200g / L, put them in a 100ml hydrothermal reaction kettle, tighten them and put them into an electric heating constant temperature blast Hydrothermal reaction at...

Embodiment 2

[0060] Embodiment 2, characterization of low-grade attapulgite modified material

[0061] In order to compare the improvement of the soil environment by low-grade attapulgite ores treated in different ways, except for the ethylenediamine-modified hydrothermally activated low-grade attapulgite modified material (EM-Hdt-ATP) prepared according to the method in Example 1 , and the other four attapulgite modified materials were also prepared according to the following four methods.

[0062] (1) Pretreatment of attapulgite clay: firstly, the attapulgite raw soil is roughly crushed, crushed, and ground through a 100-mesh sieve to obtain natural attapulgite clay (raw ore), which is placed in an electric heating constant temperature blast drying oven at 105°C Preserve after drying under high temperature, natural attapulgite clay (raw ore) is recorded as N-ATP;

[0063] (2) Purification of attapulgite clay: the natural attapulgite clay was purified by stirring-stationary layering meth...

Embodiment 3

[0068] Embodiment 3, material characterization analysis

[0069] Fourier Transform Infrared Spectroscopy (FTIR):

[0070] The test sample powder is scanned by ATR total reflection spectrum, and the configured MCT detector works under the cooling protection of liquid nitrogen. The resolution of the infrared spectrometer is 4cm -1 , in the test, 64 scans are superimposed, and the range of scanning wavenumber is 450cm -1 -4000cm -1 .

[0071] Four kinds of attapulgite clays except raw ore obtained by the ethylenediamine modified hydrothermally activated attapulgite material 1 (EM-Hdt-ATP-12) prepared by the method of Example 1 and the method in Example 2 Infrared spectroscopy (FTIR) analysis of its modified materials, infrared spectroscopy is the most commonly used means of characterization of attapulgite, can be divided into three bands: one is 3700-3200cm -1 The peak at the -O-H stretching vibration region; the second band is 1700-1600cm -1 , this band is the H-O-H bendin...

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Abstract

The invention relates to a preparation method and application of a low-grade attapulgite modified material. The preparation method of the low-grade attapulgite modified material is characterized in that low-grade attapulgite powder and an ethylenediamine aqueous solution with the concentration of 1%-15% (v / v) are mixed according to a solid-liquid ratio of 50-200 g / l, then are subjected to hydrothermal reaction at 180-220 DEG C for 4-24 hours, then are cooled to room temperature, and solid precipitates are separated and dried to obtain the low-grade attapulgite modified material. The low-gradeattapulgite modified material has strong adsorption effect on cadmium and other heavy metal ions and / or forms insoluble mineral salts, so that the low-grade attapulgite modified material changes intoa form unavailable to crops, thereby blocking the transformation of the cadmium and other heavy metal ions into the crops and reducing the biotoxicity thereof under the condition that the cadmium andother heavy metal ions are not removed from soil; moreover, the clay mineral is proved to have better water and fertilizer conservation characteristics, and finally the purposes of pollution control and ecological restoration can be achieved.

Description

technical field [0001] The invention belongs to the field of soil improvement, in particular to a preparation method and application of a low-grade attapulgite modified material. Background technique [0002] In recent years, with the extensive development of China's industrial and agricultural production, a large amount of heavy metal pollution has been produced, which has continuously entered the soil through natural migration and human activities, resulting in serious soil pollution. Soil pollution has three characteristics: one is concealment, air and water pollution are relatively intuitive, and can be felt by human senses, but soil pollution can only be perceived through sampling and testing of instruments and equipment, especially heavy metal pollution is difficult to detect; second is lag There are pollutants in the soil, which will not appear quickly. International experience shows that it usually takes ten years or more to appear. The third is cumulative. [0003]...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08B01J20/22B01J20/30C02F1/28C02F101/20C09K109/00
CPCB01J20/12B01J20/22B09C1/08C02F1/288C02F2101/20C09K17/40C09K2109/00
Inventor 许泽宏官国仕程晓丹姚丕荣
Owner YIBIN UNIV
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