Polyaluminum silicate-acrylamide copolymer composite flocculant and preparation method thereof

Abstract

The invention discloses a polyaluminum silicate iron-acrylamide copolymer composite flocculant and a preparation method thereof, which is characterized in that 20 parts of Na2SiO3 are added to 250 parts of deionized water, the pH value is 2 to 5, and the reaction is carried out at room temperature for 2 to 3 hours. Prepare activated silicic acid; use aluminum-containing waste, iron-containing waste hydrochloric acid and industrial hydrochloric acid to obtain mixed crystals of AlCl3 and FeCl2; add 1.2 to 25.0 parts of mixed crystals to 25 parts of activated silicic acid, react, stand and mature, and obtain poly Aluminum iron silicate PAFSI; add 20 parts of acrylamide, 75-450 parts of deionized water, 5-20 parts of ionic monomer, and 0.3-6 parts of macromonomer into the reaction bottle, stir, pH value 5-9, pass N2 , add 0.008-0.4 parts of potassium persulfate at 40-70°C, react for 12-36 hours, and prepare the copolymer PAME; add 100 parts of 5 g / L PAME solution into the reaction bottle, and add 12-350 parts under rapid stirring 100 g / L PAFSI solution, pH value 1-4, react at 30-40°C for 2-3 hours, then react at 50-75°C for 2-4 hours, and mature for 24 hours to prepare PAFSI-PAME composite flocculant.

Description

1. Technical field [0001] The invention relates to a polyaluminum silicate-acrylamide copolymer composite flocculant and a preparation method thereof. The flocculant can be used for oil and gas field fracturing flowback fluid, oil and gas field produced water, printing and dyeing, papermaking, textile, steel, brewing, The water treatment of petrochemical, metallurgical and food waste water belongs to the fields of environmental engineering, inorganic chemistry, polymer materials and oilfield chemistry. 2. Technical Background [0002] my country's water resources are short, especially in the northwest region, and all walks of life have serious water pollution due to economic development. Therefore, the protection of water resources and wastewater treatment are major issues of environmental protection in our country. In the process of wastewater treatment, it is divided into primary, secondary and tertiary treatment according to the degree of treatment. The primary treatment ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a coagulation treatment that can be used for oil and gas mining wastewater, industrial wastewater and urban domestic sewage, which is safe and safe, in view of the high dosage of flocculant products, the existence of secondary pollution, and the need to improve the water treatment effect. The environment-friendly aluminum iron polysilicate-acrylamide copolymer composite flocculant and its preparation method are characterized in that the iron aluminum iron polysilicate PAFSI is prepared by at least one of aluminum-containing waste aluminum slag and aluminum ash and iron-containing waste hydrochloric acid ; With acrylamide AM as the main hydrophilic monomer, macromonomer allyl alkylphenol polyoxyethylene ether CH 2 =CH-CH 2 (OCH 2 CH 2 ) n -O-C 6 h 4 -C m h 2m+1 , n=8~60, m=1~9 and allyl alkyl polyoxyethylene ether CH 2 =CH-CH 2 (OCH 2 CH 2 ) n -O-C m h 2m+1 , n=8~60, at least one of m=2~9 as the functional comonomer, the ionic monomer acrylic acid, methacrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, dimethyl Diallyl ammonium chloride, ethyl methacrylate trimethyl ammonium chloride, ethyl acrylate trimethyl ammonium chloride and 2-acrylamido-2-methylpropyl trimethyl ammonium chloride At least one of them is used as another comonomer to prepare acrylamide copolymer PAME; then PAFSI and PAME are chemically reacted in aqueous solution at 50-75°C to prepare the composite flocculant PAFSI-PAME

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