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Quick settling type flocculating agent and its preparation method

A flocculant, fast technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of large floor area and large equipment investment

Active Publication Date: 2005-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They have cumbersome problems such as dissolution and mixing of medicaments, and the investment in equipment is large and the floor area is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After the aqueous solution with acrylamide monomer concentration of 25% was deoxygenated by nitrogen gas for 0.5 h, 0.01% ammonium persulfate and 0.02% sodium sulfite initiator were added, and polymerization was carried out at 25°C for 4 hours to obtain polyacrylamide colloid. Among them, the average molecular weight of polyacrylamide is 12 million.

[0021] Take 500g of the above-mentioned polyacrylamide colloid and place it in a kneader, add 10% sodium silicate (the weight percentage of the pure polymer; the same below), add 10% quartz sand (particle size 120 mesh), add 1% urea , adding 1% sodium carbonate. It was kneaded at 70°C for 3 hours and at 120°C for 1.5 hours. The obtained colloid is granulated into small colloid particles with a particle size of 0.2mm to 0.4mm, dried with hot air at 90°C for 1.5h, crushed and sieved with a 60-mesh sieve to obtain the flocculant-1.

Embodiment 2

[0023] After deoxygenating the aqueous solution with a concentration of 15% acrylamide monomer by passing nitrogen gas for 0.5 h, add 0.02% N, N-dihydroxyethyl azobisisobutylamidine sodium hydrochloride initiator, and polymerize at 30°C for 3 hours to obtain polyacrylamide colloid. Among them, the average molecular weight of polyacrylamide is 10 million.

[0024] Take 500g of the above-mentioned polyacrylamide colloid and place it in a kneader, add 5% sodium silicate (the weight percentage of the pure polymer; the same below), add 15% quartz sand (particle size 140 mesh), add 2% urea , add 0.5% ammonium carbonate. It was kneaded at 90°C for 1.5 hours and at 130°C for 2 hours. Granulate the obtained colloid into small colloid particles with a particle size of 0.2 mm to 0.4 mm, dry it with hot air at 80°C for 2 hours, and then pulverize it to obtain the flocculant-2.

Embodiment 3

[0026] The aqueous solution with acrylamide monomer concentration of 30% was deoxygenated by passing nitrogen gas for 0.5h, then adding 0.02% potassium persulfate and 0.02% sodium bisulfite initiator, and polymerized at 30°C for 3.5 hours to obtain polyacrylamide colloid. Among them, the average molecular weight of polyacrylamide is 16 million.

[0027] Take 500g of the above-mentioned polyacrylamide colloid and place it in a kneader, add 10% aluminum silicate (the weight percentage of the pure polymer; the same below), add 5% quartz sand (particle size 120 mesh), add 5% urea , add 0.2% sodium bicarbonate. It was kneaded at 80°C for 1.5 hours and at 110°C for 2.5 hours. The obtained colloid is granulated into small particle colloids with a particle size of 0.2 mm to 0.4 mm, dried with hot air at 95°C for 2.0 hours, and then pulverized to become the flocculant-3.

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Abstract

A quick settling-type fluccolant is prepared from polyacrylamide, silicate, quartz sand, urea and carbonate through kneading, granulating, drying and pulverizing.

Description

technical field [0001] The invention relates to a flocculant and a preparation method thereof, in particular to a fast-settling flocculant and a preparation method thereof. Background technique [0002] Flocculants play an important role in the wastewater treatment process. Inorganic flocculants (such as polyaluminum chloride, polyferric sulfate, etc.) are widely used due to their cheapness, easy availability, and high positive charge density. But its disadvantage is that when treating sewage, the flocs formed are small, the flocs and water are separated slowly, and a small number of tiny particles can be suspended in water for a long time, making it difficult to separate them from the water body. The organic polymer flocculant has been more and more widely used due to its advantages of small dosage of medicament, less amount of flocs produced, and easy separation of flocs. [0003] Chinese patent CN1343631A discloses a sewage water purifying agent, which uses carbon powde...

Claims

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Application Information

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IPC IPC(8): C02F1/56
Inventor 王有华杨丽黄玉洪赵景霞回军韩建华
Owner CHINA PETROLEUM & CHEM CORP
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