Preparation method and application of attapulgite clay dephosphorization adsorbent

A technology of attapulgite clay and phosphorus adsorbent, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve the problems of reducing phosphorus adsorption, long production cycle, and large energy consumption, and achieve Excellent water resistance and low cost

A technology of attapulgite clay and phosphorus adsorbent, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, and can solve the problems of reducing phosphorus adsorption, long production cycle, and large energy consumption, and achieve Excellent water resistance and low cost

CN101653722AInactive Publication Date: 2010-02-24HEFEI UNIV OF TECH
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Attapulgite clay ore with attapulgite content greater than 60% is selected, and pre-stocked and homogenized. The homogenized ore is adjusted to have a water content of 40-50% by weight, and is sheared and extruded by an extruder to form flakes. The extruded attapulgite clay is dried or dried, crushed through a 0.1mm sieve, and the attapulgite clay powder smaller than 0.1mm is calcined in a muffle furnace at a high temperature of 500°C for 2 hours to obtain attapulgite clay. Phosphorus adsorption powder. Weigh 0.1g of the prepared phosphorus-removing adsorbent powder and add it to 100ml of phosphorus-containing 1mg / L aqueous solution, stir and adsorb for 120 minutes, settle for 2 hours, measure the phosphorus concentration in the supernatant, and obtain the phosphorus concentration in the effluent is less than 0.02mg / L , Phosphorus removal rate is 99.6%.

Embodiment 2

[0026] Attapulgite clay ore with attapulgite content greater than 60% is selected, and pre-stocked and homogenized. The attapulgite clay is air-dried or dried, and crushed into a powder smaller than 0.1mm. Add sodium metaaluminate binder to the attapulgite powder according to 5% by weight, form pellets into granules, and calcinate the granules at a high temperature of 400°C for 2 hours to obtain attapulgite clay phosphorus-removing adsorption granules. Fill the attapulgite clay phosphorus removal adsorption granule into the experimental column with a diameter of 5cm and a height of 100cm, and use a peristaltic pump to flow up and input a phosphorus-containing 1mg / L aqueous solution with a hydraulic retention time of 1 hour to measure the concentration of phosphorus in the water and obtain the cumulative flow rate of the effluent over 8m 3 , the phosphorus concentration is less than 0.02mg / L.

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Abstract

The invention relates to a preparation method and application of attapulgite clay dephosphorization adsorbent, wherein the preparation method is characterized by comprising the following steps: selecting attapulgite clay ore with the attapulgite content being more than 60 percent, stockpiling and homogenizing, then adjusting the water content of ore to be 40-50 percent by weight, and cutting and extruding by an extruder to form laminar materials; airing or drying the laminar materials, then crushing into powder and granules with different grain diameters; respectively roasting the granules at300-500 DEG C to obtain attapulgite clay dephosphorization adsorption granules with different particle grades; roasting the powder for 0.5-2 hours at 300-500 DEG C to obtain attapulgite clay phosphorus adsorption powder; or pelleting the powder to form granules, then roasting to obtain attapulgite clay dephosphorization adsorption granules. The invention provides a low-cost and high-efficiency absorption material and a method for low-concentration phosphoric water treatment.

Description

technical field [0001] The invention relates to a method for preparing a phosphorus-removing adsorbent by using attapulgite clay as a raw material and its application. Background technique [0002] The direct discharge of industrial wastewater and domestic sewage has led to a sharp increase in the phosphorus content in the water. On the one hand, the excess phosphorus in the water body comes from external industrial wastewater and domestic sewage, non-point source pollution, and on the other hand, it also has its endogenous effect, that is, the sediment in the water body will release phosphate in the reduced state, thereby increasing the phosphorus content. . Phosphorus eutrophication usually occurs in lakes, reservoirs, bays, plain river ditches and ditches, urban rivers, urban landscape water bodies and other waters with poor self-purification ability. In recent years, the continuous occurrence of red tides in the Bohai Sea is directly related to the high content of phos...

Claims

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Application Information

Patent Timeline
24 Feb 2010
Publication
CN101653722A
IPC
B01J20/30; B01J20/12; C02F1/28
Inventors
陈天虎; 汪家源