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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AI-Extracted 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...
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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.

Application Domain

Other chemical processesWater/sewage treatment by sorption

Technology Topic

Industrial wasteCoal +8

Examples

  • Experimental program(4)

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 sewage, stir quickly for 1 minute, and let it settle for 2 minutes. After the treatment, the pH of the water was 7.0, the phosphorus concentration was 1.3 mg/L, the phosphorus removal rate was 55.2%, and the phosphorus adsorption capacity was 16 mg/kg.

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 it into 10L of the domestic sewage, stir quickly for 1 minute, and let it settle for 2 minutes. After the treatment, the pH of the water was 6.9, the phosphorus concentration was 0.2 mg/L, the phosphorus removal rate was 93%, and the phosphorus adsorption capacity was 27 mg/kg.

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 the domestic sewage, stir quickly for 1 minute, and let it settle for 2 minutes. After the treatment, the pH of the water was 6.9, the phosphorus concentration was 0.6 mg/L, the phosphorus removal rate was 79.3%, and the phosphorus adsorption capacity was 23 mg/kg.
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