72results about How to "Dense floc" patented technology

The invention relates to a polymer emulsion for polymer-containing sewage treatment, which is used for processing oil field sewage and a preparation method thereof. The polymer emulsion can have strong adsorptive capacity on colloidal particles and oil droplets in sewage so that the oil droplets are inverted and rapidly copolymerized. Acrylamide and acryloyloxy ethyl trimethyl ammonium chloride are adopted as cationic monomers, fatty alcohol-polyoxyethylene ethers MOA-3 and MOA-9 are adopted as emulsifying agents, tasteless kerosene is adopted as a continuous phase, water is adopted as a dispersed phase and 2,2'-azodissobutyl amidinodihydrochloride is adopted as an initiating agent; and the solid content of the obtained emulsion is 40-50 percent, the cationic degree of a polymer is 50-70 percent, and the characteristic viscosity number of the polymer is 1,026-1,378ml / g. The preparation method comprises the steps of: adding the raw materials into a reactor and stirring to form emulsion; and raising the temperature and introducing nitrogen for removing oxygen, and adding the initiating agent to react at constant temperature for five hours to obtain the polymer emulsion. The emulsionfor treating polymer-containing sewage has the advantages of less medicament dosage, high oil and water separating speed, compact flocculating body, obvious water purifying effect, and the like, and can be used for treating the polymer-containing sewage of an oil field.

The invention relates to a composite iron salt coagulating agent, which is prepared from the following components in parts by weight: 100 parts of iron-containing waste hydrochloric acid, 10 to 30 parts of aluminum-containing sludge, 1 to 5 parts of silicic acid and 0.4 to 2 parts of sodium chlorate. A preparation method comprises the following steps of adding the iron-containing waste hydrochloric acid into a reaction kettle, adding the sodium chlorate into the reaction kettle, and agitating an obtained mixture for reaction; adding the aluminum-containing sludge into the reaction kettle, and agitating a newly obtained mixture for reaction; dropwise adding the silicic acid into the reaction kettle, and agitating a finally obtained mixture for reaction, to obtain the composite iron salt coagulating agent. The composite iron salt coagulating agent has the beneficial effects that (1), the composite coagulating agent is simple in preparation process, wide in sources of raw materials and low in cost; (2), the product performance is stable, the dosage of an agent is less, and a flocculating constituent is compact and is further quick in sedimentation rate; (3), the composite iron salt coagulating agent has favorable decoloration performance and a higher COD (Chemical Oxygen Demand) removal rate, and is wider in pH (potential of hydrogen) serviceable range.

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.

The invention provides a wastewater treatment method for wet regeneration of mixed casting waste sand. First, the wastewater is demulsified, and then the suspended matter with larger particles in the wastewater is flocculated in a spiral flocculation tank with an inorganic flocculant, and then an organic flocculant is used to The flocculant flocculates the suspended solids with small particles, and passes through the inclined tube settling tank for static settlement. The floc layer formed by compression at the bottom is pumped out by the sludge pump at the bottom of the settling tank, flocculated with organic flocculant again, and finally concentrated by belt type vacuum filter Integrated machine treatment, the moisture content of the sludge coming out of the filter cake outlet of the belt-type concentrated vacuum filter press integrated machine is below 40%; while the overflow supernatant of the inclined tube settling tank and the clear water outlet The clean water meets the requirements of production circulation water and the standard of direct discharge.