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Production method for achieving phosphorus immobilization capacity amplification of clay mineral

A technology of clay minerals and production methods, applied in the field of water pollution control, can solve problems such as complex and cumbersome preparation procedures, secondary pollution, etc., and achieve the effects of broad application prospects, high loading capacity, and wide pH range

Active Publication Date: 2020-01-14
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention mainly aims at the problem that the current international clay-type phosphorus-locking (fixing) agent has complex and cumbersome preparation procedures (generally hydration loading method, and a large amount of waste liquid is generated in the production process), which is easy to cause secondary pollution, and proposes a quick realization Clay minerals, especially dry production method of attapulgite clay for phosphorus fixation capacity expansion

Method used

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  • Production method for achieving phosphorus immobilization capacity amplification of clay mineral
  • Production method for achieving phosphorus immobilization capacity amplification of clay mineral
  • Production method for achieving phosphorus immobilization capacity amplification of clay mineral

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The attapulgite clay raw ore with a mass content of mineral components greater than or equal to 40% is screened and mechanically crushed into a powder with a sieve mesh greater than or equal to 100 mesh. Mix the powder of attapulgite clay with the mixed solution of polyaluminum chloride and lanthanum chloride according to the solid-to-liquid ratio of 6-9:1, carry out physical mixing for 4 hours, and then use commercially available extrusion equipment to prepare a diameter of 4-6mm , a columnar body phosphorus-locking agent with a length of 2-8mm. Weigh 0.5 g of the above-mentioned phosphorus-locking agent in phosphorus solutions of different solubility, and react for 24 hours to measure the removal efficiency of phosphorus. The result is as figure 1 shown.

Embodiment 2

[0032] The raw ore of bentonite, sepiolite or diatomite with a mass content of mineral components greater than or equal to 40% is screened and mechanically crushed into a powder with a sieve mesh greater than or equal to 100 mesh. Mixing the powder of the attapulgite clay with the mixed solution of polyaluminum chloride and lanthanum chloride according to the solid-to-liquid ratio of 9 to 15:1, and the mass fraction of aluminum in the mixed solution and the mixture of the attapulgite clay is 1% , the mass fraction of lanthanum in the mixture of the mixed solution and the attapulgite clay is 2%. After sufficient physical mixing for 8 hours, a columnar phosphor-locking agent with a diameter of 4-6 mm and a length of 2-8 mm was prepared by commercially available extrusion equipment.

Embodiment 3

[0034] Attapulgite clays of different grades (low, medium, high) were selected as carriers, and mixed and extruded for physical shaping according to the method described in Example 1. In order to simulate the effect of actual use, 10.0g of different materials were put into 500mL of deionized water, and the dissolution rate and degree of dissolution of the analysis materials in water were observed. The degree of dispersion of the material in the water body determines its phosphorus removal effect in the water body. Phosphorus removal effects of different materials such as figure 2 shown.

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Abstract

The invention discloses a production method for achieving phosphorus immobilization capacity amplification of a clay mineral. The production method comprises the following steps: uniformly mixing thepowder of a clay mineral with a mixed solution of lanthanum chloride and polyaluminium chloride, and performing extrusion so as to obtain particles, wherein the solid-liquid mass ratio of the clay mineral to the mixed solution is greater than or equal to 6:1. The method has the characteristics of being simple and low in cost, the prepared phosphorus locking (immobilization) material is large in phosphorus immobilization capacity, simple in production process, free of secondary pollution and free of residual waste liquid. The prepared product can be used for controlling release of phosphorus inindustrial sewage, eutrophication water and polluted sediment, and the eutrophication degree of water can be effectively controlled and alleviated.

Description

technical field [0001] The invention belongs to the technical field of water pollution control and relates to a dry production method for quickly realizing the expansion of the phosphorus-fixing capacity of clay minerals. Background technique [0002] Numerous studies have shown that phosphorus is the limiting factor for lake eutrophication. Therefore, phosphorus control is considered to be the key to the control of eutrophic water bodies in lakes. However, related research at home and abroad has shown that even after the input of exogenous phosphorus to lakes is effectively controlled, the problem of lake eutrophication can still persist for decades. This is mainly due to the continuous release of phosphorus from the lake bottom mud (or sediment), which can effectively replenish phosphorus in the overlying water body, thereby providing a phosphorus source basis for the outbreak of cyanobacteria. These studies show that the control of endogenous phosphorus in lakes is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F101/10
CPCC02F1/00C02F2101/105
Inventor 尹洪斌
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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