CN-110624499-B - Red clay phosphorus adsorbent and preparation method and application thereof

CN110624499BCN 110624499 BCN110624499 BCN 110624499BCN-110624499-B

Abstract

The invention discloses a red clay phosphorus adsorbent which comprises 115-145 parts of red clay particles, 20-30 parts of diatomite, 10-15 parts of glass powder and 3-10 parts of marble powder, wherein the preparation process comprises the steps of preparing the red clay particles, weighing raw materials, crushing, calcining, mixing and the like. The red clay has better adsorption performance on phosphorus, has the characteristics of rich resources, wide distribution range and low cost, is a natural environment-friendly material, and can not bring secondary pollution when being put into sewage water, so that the red clay has great development potential in the aspect of phosphorus adsorption.

Inventors

HANG XIAOSHUAI
ZHUANG WEI
CHAO JIANYING
WANG WEI
ZHANG LEI
YOU XIAOHUI
ZHU DONGDONG
DING CHENGCHENG
CUI YIBIN
CHEN YUDONG
HE FEI

Assignees

生态环境部南京环境科学研究所
生态环境部南京环境科学研究所

Dates

Publication Date: 20260421
Application Date: 20190906
Priority Date: 20190906

Claims (3)

1. The red clay phosphorus adsorbent is characterized by comprising the following components in parts by weight: 115-145 parts of red clay particles, 20-30 parts of diatomite, 10-15 parts of glass powder and 3-10 parts of marble powder, and further comprises the following components in parts by weight of 5-10 parts of sodium borate; The preparation method of the red clay phosphorus adsorbent comprises the following steps: Preparing red clay particles by taking natural red clay in the south as a raw material; Weighing raw materials according to the weight portion, and uniformly mixing the weighed raw materials to obtain a mixture; Step three, crushing and calcining, namely drying and crushing the mixture obtained in the step two to 200-300 meshes, and calcining the crushed raw materials to obtain adsorption ingredients; mixing, namely mixing the red clay particles prepared in the step one with adsorption ingredients according to the weight part ratio to obtain a phosphorus adsorbent; In the first step, red clay is taken as a raw material, and the specific process for preparing the red clay particles comprises the following steps: (1) Coarse-selecting natural red clay, and selecting red clay with sticky powder particles and iron-aluminum oxide content of 35-60%; (2) Crushing and purifying the red clay obtained by rough selection in the step (1), and separating out cosmids with the particle size of 0.1-2 mu m; (3) Drying and crushing the cosmid obtained in the step (2), sieving the crushed cosmid with a 100-mesh sieve, putting the sieved cosmid into a thermal reactor, roasting for 1-2 hours at 200-800 ℃, taking out the cosmid after roasting, cooling at room temperature, and crushing to obtain red clay particles; In the step (2), purifying the red clay by using a magnetic stirrer; In the step (3), before roasting, the cosmid is crushed to the fineness of 70-80 meshes; In the step (3), after roasting, the cosmids are crushed to 200-300 meshes; The calcination process of the raw materials in the third step is as follows: Heating to 400-500 ℃ at a heating rate of 10-15 ℃ per minute, preserving heat for 20-30min, heating to 1000-1100 ℃ at a heating rate of 10-15 ℃ per minute, preserving heat for 10-20min, cooling to 800-900 ℃ at a cooling rate of 20-30 ℃ per minute, and naturally cooling to normal temperature to obtain the adsorption ingredients.
2. The red clay phosphorus adsorbent according to claim 1 wherein the steps two through three are crushed with a crusher.
3. The use of a red clay phosphorus adsorbent according to claim 1 for adsorbing phosphorus in wastewater.

Description

Red clay phosphorus adsorbent and preparation method and application thereof Technical Field The invention relates to the technical field of phosphorus adsorption materials, in particular to a red clay phosphorus adsorbent and a preparation method and application thereof. Background In recent years, the eutrophication phenomenon of water bodies is aggravated, and the water environment is difficult to treat. Phosphorus is a major factor in causing eutrophication of water, and therefore, reduction of phosphorus emissions is a key to controlling water eutrophication. Currently, wastewater dephosphorization methods can be classified into 3 types, physical, chemical and biological. The physical method has the defects of poor treatment effect, difficult operation of the biological method and the like, and is limited in practical application. At present, a relatively wide method used at home and abroad is a chemical dephosphorization method. The adsorption method is a common chemical phosphorus removal method, and in recent years, the adsorption method is attracting attention because of economy and effectiveness, and development of efficient and low-cost phosphorus adsorption materials are hot spots for research of the adsorption method. As land resources, red clay is widely distributed in tropical and subtropical zones, but the red clay is barren, has poor productivity, is not suitable for crop growth and has low crop yield. However, the red clay has higher clay content, is rich in oxides such as iron and aluminum, and particularly has stronger adsorption fixing capability on phosphorus, and at present, research on the fixing and releasing of phosphorus in soil and influencing factors thereof by the red clay is mainly focused at home and abroad, and the red clay is used as an adsorption material and is still freshly reported as an adsorbent for phosphorus in polluted water bodies. Therefore, how to prepare a red clay as a phosphorus adsorbent and apply it to adsorption of phosphorus in sewage is a problem that the skilled person needs to solve. Disclosure of Invention In view of the above, the invention provides a red clay phosphorus adsorbent, a preparation method and application thereof, wherein the red clay has better phosphorus adsorption performance, has the characteristics of rich resources, wide distribution range and low cost, and meanwhile, the red clay is a natural environment-friendly material, and can not bring secondary pollution and other problems when being put into sewage water, so that the red clay has great development potential in the aspect of phosphorus adsorption. In order to achieve the above purpose, the present invention adopts the following technical scheme: the red clay phosphorus adsorbent comprises the following components in parts by weight: 115-145 parts of red clay particles, 20-30 parts of diatomite, 10-15 parts of glass powder and 3-10 parts of marble powder. The technical effects achieved by the technical scheme are that the red clay has excellent phosphorus adsorption performance, is suitable for adsorbing phosphorus in natural water and wastewater, is rich in red clay source, wide in distribution range and low in cost, is a natural environment-friendly material, does not bring secondary environmental pollution, and is decomposed and foamed when being calcined, so that diatomite and glass powder have loose porous structures, and the phosphorus adsorption capacity of the diatomite and the glass powder is enhanced. As a preferable technical scheme of the invention, the red clay phosphorus adsorbent also comprises the following components in parts by weight of 5-10 parts of sodium borate. A method for preparing red clay phosphorus adsorbent, comprising the following steps: Preparing red clay particles by taking natural red clay in the south as a raw material; Weighing raw materials, namely weighing diatomite, glass powder, marble powder and sodium borate according to the weight proportion, and uniformly mixing the weighed raw materials to obtain a mixture Step three, crushing and calcining, namely drying and crushing the mixture obtained in the step two to 200-300 meshes, and calcining the crushed raw materials to obtain adsorption ingredients; and step four, mixing, namely mixing the red clay particles prepared in the step one with adsorption ingredients according to the weight part ratio to obtain the phosphorus adsorbent. The technical effect achieved by the technical scheme is that marble, diatomite, sodium borate and glass powder are mixed and calcined, and CO 2 produced after marble is heated and decomposed enables the surfaces of the glass powder, the diatomite and the sodium borate to form a loose and porous structure, so that the adsorption performance of the glass powder, the diatomite and the sodium borate on phosphorus and other heavy metals is enhanced. In the first step, the red clay is used as a raw material, and the specific process for preparing the red clay parti