Method for preparing active fly ash phosphorus adsorbent

A technology of phosphorus adsorbent and fly ash, which is applied in the field of preparation of adsorbent and active fly ash phosphorus adsorbent, can solve the problems of increased pH value, large sludge production, excessive ash content, etc., and achieves a solution Dealing with problems, reducing the amount of dosage, and the effects of a wide range of sources

Inactive Publication Date: 2005-09-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a high dosage causes the following three major problems: 1. Excessive ash content and difficulty in separating gray water, resulting in a serious excess of suspended solids-SS in the effluent; 2. Fly ash contains a large amount of free calcium oxide, calcium oxide After a chemical reaction with water, calcium hyd

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] The raw material is fly ash from a power plant in Shanghai. 10 kilograms of fly ash and 2 kilograms of sodium silicate are mixed uniformly in a high-speed mixer. The mixture was put into a medium-temperature roasting furnace to be roasted and activated at 600°C for 1 hour. The roasted and activated materials were taken out and cooled and put into an acid-resistant reaction tank, 5L of 5% hydrochloric acid was added and heated to 60°C, and reacted for 4 hours. After the reaction, a material is formed, which is dried and ground to produce a powdery high-activity phosphorus adsorbent product totaling 11.2 kg.

[0020] The phosphorus adsorbent made by the above process was used to carry out the phosphorus removal experiment of domestic sewage. The domestic sewage is taken from Shanghai Xinzhuang Water Purification Plant. The raw water has a phosphorus content of 2.9 mg / L and a pH of 7.1. Take 1 gram of phosphorus adsorbent and put it into 10L of the domestic ...

Example Embodiment

[0021] Example 2

[0022] The raw material is fly ash from a power plant in Shanghai, and 10 kilograms of fly ash and 10 kilograms of calcium silicate are mixed uniformly in a high-speed mixer. The mixture is put into a medium-temperature roasting furnace to be roasted and activated at 1000° C., and the roasting time is 4 hours. The roasted and activated materials were taken out and cooled and put into an acid-resistant reaction tank, 5L of 10% sulfuric acid was added and heated to 60°C, and reacted for 10 hours. After the reaction, a material is generated, which is dried and ground to form a powdery high-activity phosphorus adsorbent product totaling 19.7 kg.

[0023] The phosphorus adsorbent made by the above process was used to carry out the phosphorus removal experiment of domestic sewage. The domestic sewage is taken from Shanghai Xinzhuang Water Purification Plant. The raw water has a phosphorus content of 2.9 mg / L and a pH of 7.1. Take 1 gram of phosphorus adsorbent and put...

Example Embodiment

[0024] Example 3

[0025] The raw material is fly ash from a power plant in Shanghai. 10 kilograms of fly ash and 3 kilograms of calcium carbonate are mixed uniformly in a high-speed mixer. The mixture was put into a medium-temperature roasting furnace to be roasted and activated at 700°C for 2 hours. The roasted and activated materials are taken out, cooled, and put into an acid-resistant reaction tank, and 5 L of 7% nitric acid is added and heated to 60° C., and reacted for 6 hours. After the reaction, a material is generated, which is dried and ground to form a powdery high-activity phosphorus adsorbent product with a total amount of 12.6 kg.

[0026] The phosphorus adsorbent made by the above process was used to carry out the phosphorus removal experiment of domestic sewage. The domestic sewage is taken from Shanghai Xinzhuang Water Purification Plant. The raw water has a phosphorus content of 2.9 mg / L and a pH of 7.1. Take 1 gram of phosphorus adsorbent and put it into 10L of...

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Abstract

The invention relates to a method for preparing an active coal ash phosphoric adsorbent, which comprises the following steps: a) mixing the coal ash and the basic activating agent evenly in the high-speed batch mixer, b) roasting and activating them in the calcining furnace, c) putting them into the acidproof retort after cooling and adding acidic modifier into the retort, d) heating them to react, then drying and grinding the materials and getting the powdered phosphoric adsorbent with high active. Said invention uses the industrial waste coal ash as the raw material, and by means of the low-cost activating agent and modifier it can dissolve out the material with high absorptive in the coal ash, and the prepared absorbent has high dephosphorize effect.

Description

technical field [0001] The invention relates to a preparation method of an active fly ash phosphorus adsorbent, which is a preparation method of an adsorbent for removing phosphorus in water by using industrial waste fly ash as a raw material, and belongs to the technical field of water treatment. Background technique [0002] In recent years, the eutrophication of lakes and rivers caused by excessive nutrients such as nitrogen and phosphorus in water bodies has become a major environmental problem facing our country. Scientific research shows that when the total phosphorus content in slow-flowing water bodies such as lakes and reservoirs exceeds 0.02mg / L, blue-green algae blooms may break out. At present, most of the domestic and foreign phosphorus removal methods are biological or physical and chemical. When the biological phosphorus removal method is used, large-scale transformation of conventional secondary urban sewage treatment plants is required, and the construction...

Claims

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Application Information

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IPC IPC(8): B01J20/00C02F1/28
Inventor 孔海南陈雪初王新泽
Owner SHANGHAI JIAO TONG UNIV
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