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Preparation method of efficient calcium-based sepiolite phosphorus adsorbent and application thereof

A phosphorus adsorbent, sepiolite technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc. In order to achieve the effect of efficient and rapid removal, increase fixed capacity, and improve adsorption efficiency

Inactive Publication Date: 2013-05-22
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Natural calcium-rich clay minerals (such as calcium-rich sepiolite) are usually used as phosphorus adsorbents. However, since the calcium components in natural calcium-rich materials are usually carbonate-like calcium salts, their adsorption and fixation of phosphorus is not sufficient. High, the removal rate of low-concentration phosphorus-containing sewage is too low, and the pH range of the application is too narrow, which greatly limits the application range of natural calcium-rich clay minerals as phosphorus adsorbents

Method used

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  • Preparation method of efficient calcium-based sepiolite phosphorus adsorbent and application thereof
  • Preparation method of efficient calcium-based sepiolite phosphorus adsorbent and application thereof
  • Preparation method of efficient calcium-based sepiolite phosphorus adsorbent and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1 Preparation of calcium-based sepiolite phosphorus adsorbent

[0030] Take a certain amount of undisturbed calcium-rich sepiolite, grind it mechanically to less than 100 mesh, and dry it at 105°C to constant weight, and then heat it at a certain temperature (200°C-1000°C, every interval of 100°C is a gradient). The time (0.5h, 1h, and 2h) was modified by heating to prepare calcium-based sepiolite phosphorus adsorbent.

[0031] Take 0.5g of the adsorption material obtained under the above different treatment conditions, add 50ml centrifuge tubes filled with 25ml low (0.5 mg / L), medium (30mg / L) and high (400mg / L) concentration phosphorus-containing wastewater After shaking (160rmp) at constant temperature (25°C) for 12 hours, centrifuge the solution, measure the residual phosphorus concentration in the supernatant, calculate the phosphorus removal rate, and determine the optimum modification temperature and time based on the above results.

[0032] The experimen...

Embodiment 2

[0033] Example 2 Comparison of Phosphorus Removal Effects Before and After Thermal Modification of Calcium-rich Sepiolite

[0034]Take 0.5 g of the modified and untreated calcium-rich sepiolite prepared in Example 1 and place them in 25 ml of phosphorus-containing wastewater of different concentrations (0.05 mg / L-600 mg / L) respectively. In a centrifuge tube, shake (160rmp) at a constant temperature (25°C) for 12 hours, then centrifuge the solution, measure the residual phosphorus concentration in the supernatant, and calculate the phosphorus removal rate. The result is as Figure 2a and Figure 2b shown.

[0035] Figure 2a and Figure 2b It shows that the calcium-rich sepiolite adsorbent of the present invention removes phosphorus, and for low concentration sewage (0.05 mg / L≤phosphorus concentration≤1 mg / L), the phosphorus removal rate is 80.0%~98.8%; for medium and high concentration sewage (1mg / L / L<phosphorus concentration≤600mg / L), the phosphorus removal rate is 99.0...

Embodiment 3

[0036] Example 3 The actual removal effect of modified calcium-rich sepiolite on phosphorus in lake water

[0037] Take 2 g of modified and untreated calcium-rich sepiolite prepared in Example 1 and put it into 1 L of Chaohu Lake water with a phosphorus concentration of 0.054 (dosing amount is 2 g / L), fully shake, and Take water samples for filtration at 5 minutes, 30 minutes and 60 minutes, analyze the phosphorus concentration, and calculate the phosphorus removal rate. The result is as image 3 shown.

[0038] image 3 The results show that the phosphorus removal rate of the calcium-rich sepiolite adsorbent treated at 900 ° C is 88.9% in 5 minutes, 96.8% in 30 minutes, and 97.6% in 60 minutes. In contrast, the phosphorus removal rate of untreated calcium-rich sepiolite was 45.4% in 5 minutes, 52.1% in 30 minutes, and 55.6% in 60 minutes.

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Abstract

The invention relates to a preparation method of an efficient calcium-based sepiolite phosphorus adsorbent. The preparation method comprises the following steps of mechanically pulverizing natural calcium-enriched sepiolite ore into powder, drying the powder at constant temperature, and then directly heating and modifying the powder to obtain the calcium-based sepiolite phosphorus adsorbent. According to the preparation method provided by the invention, inertia calcium in the natural calcium-enriched sepiolite is activated through a heating and modification method, a part of active calcium enters into a sepiolite lattice system, and the alcium-based sepiolite adsorbent having high absorption capacity to phosphorus is generated by the original ore through recombination and reaction. The calcium-based sepiolite phosphorus adsorbent provided by the invention is used for eliminating phosphorus in polluted water or bottom sediment, and is capable of efficiently and rapidly eliminating phosphate in the water and efficiently translating labile phosphorus in the polluted bottom sediment into inert calcium phosphorus, thereby achieving the aim of controlling nutrition enrichment of lakes. The calcium-based sepiolite phosphorus adsorbent prepared by the preparation method has the advantages of wide raw material distribution, low cost, simple preparation process, obvious phosphorus fixation effect, and wide application prospect and use value.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and relates to a preparation method and application of a phosphorus adsorption material in polluted water bodies and polluted sediments, in particular, to a preparation method of a high-efficiency calcium-based sepiolite phosphorus adsorbent and its application. The application is to modify the natural calcium-rich sepiolite clay mineral into an adsorbent with high-efficiency phosphorus fixation performance, and use it for the adsorption and removal of phosphorus pollution in industrial or domestic sewage, eutrophic water, as well as in rivers, lakes and Adsorption and fixation of phosphorus pollution in polluted sediments in aquatic ecosystems such as lakeside wetlands. Background technique [0002] Water eutrophication has become a global environmental pollution problem. In my country, 85.4% of the area is larger than 10km 2 of lakes are in eutrophication state, and 40.1% of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30C02F1/28
Inventor 尹洪斌孔明
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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