120 results about "Settling rate" patented technology

A method is given for treating a wellbore in a subterranean formation by hydraulic fracturing, slickwater fracturing, gravel packing, and the like, by using plate-like materials as some or all of the proppant or gravel. The plate-like materials are particularly useful in complex fracture systems, for example in shales. They may be used as from about 20 to about 100% of the proppant. Relative to conventional proppants, plate-like proppants demonstrate (a) enhanced crush resistance of the proppant due to better stress distribution among proppant particles, (b) diminished proppant embedment into formation fracture faces due to the greater contact surface area of proppant particles with the formation, (c) better proppant transport due to lower proppant settling rates, (d) deeper penetration into branched and fine fracture networks, and (e) enhanced proppant flowback control. Preferred plate-like proppants are layered rocks and minerals; most preferred is mica.

The invention relates to an improved bitumen recovery process. The process includes adding water to a bitumen-froth/solvent system containing asphaltenes and mineral solids. The addition of water in droplets increases the settling rate of asphaltenes and mineral solids to more effectively treat the bitumen for pipeline transport, further enhancement, refining, or any other application of reduced-solids bitumen.

The invention provides methods and compositions for improving the production of alumina hydrate. The invention involves adding one or more polysaccharides to liquor or slurry in the fluid circuit of the production process. The one or more polysaccharides can be a cross-linked polysaccharide (such as cross-linked dextran or cross-linked dihydroxypropyl cellulose). The various polysaccharides can impart a number of advantages including at least some of: greater flocculation effectiveness, increasing the maximum effective dosage, faster settling rate. The production process can be a Bayer process.

The invention discloses a novel foam dedusting agent for a coal mine. The novel foam dedusting agent comprises, by weight, 0.5%-0.7% of foaming agent, 0.04%-0.06% of foam stabilizer, 0.4%-0.5% of wetting agent and 98.74%-99.06% of water. Modified alkyl glycoside, carboxymethylcellulose, alkylphenol ethoxylates and the water are sufficiently mixed; then, the mixed liquor is poured into a mine foam dedusting foam maker to form foams; the foams are conveyed to a dust source to cover the dust source, so that dust produced by the dust source is caught and settles, and finally good underground work environments are guaranteed. A hydrophobic grouping (lipophilic group) of wetting agent molecules adsorbed on the surface layer of the water makes contact with the coal dust first and is composed of organic carbon chains, the molecular characteristics of the hydrophobic grouping are similar to the molecular characteristics of the surface of the coal dust, the hydrophobic grouping can adsorb the coal dust more easily than water molecules, and therefore the dust catching efficiency of the foams is improved, the dust settling rate exceeds 95%, and dust settling efficiency is improved.

The invention discloses a preparation method of a flocculent decolouring agent of printing and dying wastewater. The method comprises the following steps: adding formaldehyde of 15-30 parts by weight to a reaction kettle, and then adding dicyandiamide of 20-40 parts by weight and ammonium chloride of 10-25 parts by weight thereto, heating the mixture for 1-2 hours at 50 DEG C to 60 DEG C, warming up to 70 DEG C to 80 DEG C to continuously react for 2-4h; cooling to 50 DEG C to 60 DEG C, adding urea of 0-5 parts by weight to the mixture to react for 2-4 hours to obtain a component A; mixing industrial waste alumina mud with hydrochloric acid, heating the mixture to 70 DEG C to 80 DEG C to react for 2-4 hours, and curing for 12-24 hours after cooling to obtain a component B. When in use, according to the specific ingredients of the printing and dying wastewater, the component A and the component B are mixed in a ratio of 2-3:1 and then added to the printing and dying wastewater. After the product is added to the wastewater, the effect on flocculation is good, the settling rate of dirt is rapid, the decolouring ratio is up to 95-99%, the COD (Chemical Oxygen Demand) is reduced by 80-90%, 90% of processed wastewater can be reused, and the processing cost is decreased evidently.

The present invention relates to a process for treating wastewater containing suspended solids comprising adding to the wastewater a treating substance in an amount sufficient to enhance at least one of (a) the settling rate of the solids, (b) the bulk density of the solids and (c) the filterability of the solids, said treating substance being selected from the group consisting of (i) bauxite refinery residue known as red mud, and (ii) red mud that has been at least partially reacted with calcium and/or magnesium ions so as to have a reaction pH, when mixed with five times its weight of water, of less than 10.5. In addition, the invention relates to processes for reducing the concentration of dissolved phosphorus-containing species in wastewater, for decreasing the odour of a material having an odour due to the presence of one or more sulphur-containing substances and for decreasing the propensity to develop odours and a composting process.

The invention discloses a mining bubble atomization water mist dust settling device. On the basis of traditional water mist dust settling of a mine, the mine atomizing dust settling device which is good in atomizing effect, high in dust settling rate, low in water consumption and air consumption, not prone to nozzle blockage, convenient to install, capable of saving energy and environmentally friendly is designed according to the bubble atomization principle. The mining bubble atomization water mist dust settling device is mainly characterized in that by means of an existing underground dustproof pipeline and a compressed air pipeline, a water source and an air source do not need to be pressurized, and no strict requirement for the size relationship of water pressure and air pressure exits; on the basis of not conducting any changing or adding auxiliary devices, water mist good in atomizing effect is produced, dust settling effect is greatly improved, and remarkable effect can be achieved for preventing and treating respirable dust; meanwhile, plenty of water sources is saved, and underground working conditions are effectively improved; when dust settling is conducted in places such as coal faces and driving faces with large gas gushing amount, part of air carried in the water mist can have an effect on diluting gas and preventing local gas from exceeding the limit to a certain extent.

The invention belongs to the field of wastewater treatment and particularly discloses a method and a device for culturing AGS (aerobic granular sludge). The culture method comprises steps of manual simulation wastewater preparation, inoculation, sludge culture and the like and specifically comprises the steps as follows: traditional activated sludge is taken as inoculated sludge, an SBAR (sequencing batch airlift reactor) is inoculated with the activated sludge after aeration, circulating culture is sequentially performed in a water inlet-aeration-sedimentation-drainage-anaerobic manner, anaerobic granular sludge is added after the sludge is acclimatized and stabilized, crystal nucleuses for inducing growth of aerobes is provided, and the AGS is prepared after a certain period of culture.Compared with AGS obtained through culture of common activated sludge, the AGS has greater advantages in the aspects of granule specific gravity, settling rate and microbial activity.

The invention provides a nano composite fiber clean fracturing fluid which comprises the following components in percentage by weight: 0.01wt%-0.2 wt% of nano fiber complex, 0.8wt%-1.5wt% of fiber dispersant, 3wt%-5wt% of anti-swelling agent, 0.3wt%-0.6wt% of conditioner, 0.1wt%-0.3wt% of anti-scale agent and the balance of water, wherein the nano fiber complex is polymer/inorganic ion nano composite fiber, polymer/carbon nano tube composite fiber or polymer/layered filler composite fiber. Since the nano composite fiber is uniformly dispersed in the fracturing fluid, a fiber network can be formed, the sand carrying property of the fracturing fluid is improved, the settling mode is changed, and the settling rate of a propping agent is reduced. Moreover, the nano composite fiber also can effectively prevent backflow of the propping agent and effectively reduce the filter loss rate, and the damage rate on a coal seam is only 3-10%.

The invention discloses a novel process for separating rhodium and iridium. The novel process includes the steps that (1) a strong oxidant is added into a solution containing rhodium and iridium to control the potential, and precious metal ions in the solution are converted into the high valence state; (2) the pH value of feed liquid is controlled through adding of liquid caustic soda, chlorine is introduced till the pH value is lowered to 8-9, and rhodium and iridium are transferred into slag after the procedure is repeated three times; and (3) the rhodium and iridium slag is dissolved through added hydrochloric acid, the acidity is controlled, the potential of the feed liquid is controlled to 900-950 mV by adding the strong oxidant, the temperature is controlled, and rhodium is settled by adding a reagent DETA. The novel process has the beneficial effects that 1, the rhodium and iridium separating efficiency is improved, and the rhodium settling rate is 99% or over; and 2, compared with a TBP rhodium and iridium separating process, the production cycle is shortened by 60% through the novel process.

The invention discloses a method for forming non-biological granular sludge in a heavy metal waste water treatment process, belonging to the environmental engineering field. Chemical sludge obtained in a heavy-metal-containing waste water treatment process is flocculent suspended state sludge mostly, stability, settleability and dehydration property are poorer, and effluent quality and technology operating efficiency are seriously influenced. Inspired by an induction kernel hypothesis and an extracellular polymeric substance hypothesis for forming the biological granular sludge, an improved parallel flow charging control crystallization process is applied in the invention, a heavy metal precipitation reaction mechanism is changed, and seed crystals and a flocculating agent are added, so that the non-biological heavy metal granular sludge is obtained. The method for forming the non-biological granular sludge has the advantages that an operation cycle is short, a flow path is simple, operation is easy, stability of the heavy metal chemical sludge can be effectively improved, moisture content of settled sludge is reduced by 7-8% compared with common flocculent sludge, and settling rate is increased by 4-5 times.

The invention discloses a four-step method for processing and recycling tin ore floatation wastewater, which comprises a new floatation technique, chemical treatment, physical treatment and biological treatment. The four-step method is characterized in that the principle of putting prevention first and providing prevention and control is adopted. The method is as follows: the new floatation technique and process are utilized to reduce the floatation wastewater and the microgranular particles from the headstream and reduce the usage amount of floatation reagents; because the chemical treatment method is used, the concentration of polyacrylamide in the tin ore floatation wastewater is increased from 0.5 percent to 0.9-1.1 percent, and the settling rate of part of the wastewater is improved; the physical treatment method is adopted to increase the settling distance and the settling time, the settling distance is extended for another 600 to 800m on the basis of 200m, and the settling time is increased for another 25 to 27 hours on the basis of 10 hours; aquatic organisms or plants, such as fish, frogs, aquatic weeds and the like are adopted to process the wastewater, the ecological reconstruction is realized, the agricultural irrigation standards are met, the utilization ratio of floatation return water is improved from 86 percent to above 97 percent, and peaceful and friendly coexistence of human and environment is realized.

The invention discloses a process for preparing lithium carbonate by virtue of a spodumene sulfuric acid method, relating to steps for preparing a lithium sulfate leaching solution and causticizing the lithium sulfate leaching solution in the process for producing lithium carbonate by virtue of the spodumene sulfuric acid method. The process comprises the steps of carrying out crushing, ball milling, roasting, sulfuric acid roasting and leaching, and neutralizing acid liquid to a pH value of 6.5 in the leaching solution by virtue of CaCO3 so as to enable the leaching environment of lithium sulfate to be faintly acid, so that magnesium and calcium ions are effectively removed, the drag-out quantity of lithium is relatively low, the recovery rate of lithium is relatively high, the settling rate of lithium carbonate is increased to a great extent, the yield of lithium carbonate prepared by virtue of the spodumene sulfuric acid method is further increased, and resources are saved.

A method for recovering molecular sieve crystals from a synthesis mixture that comprises adding at least one flocculant having a certain molecular weight and a certain charge density that contribute to the acceleration of the settling rate of the molecular sieve crystals and compositions made from the method.

The invention discloses a testing device capable of observing cohesive sediment flocculation and settling under different velocity gradients. The upper part of a vertical hollow settling column in the upper and lower ends of which openings are formed is communicated with a water collection tank; the upper end of a floc separation chamber is connected with the lower end of the hollow settling column; a floc collection opening used for collecting one part of floc in the hollow settling column into the floc separation chamber is formed in the upper end of the floc separation chamber; a sediment collection chamber is formed below the floc separation chamber and is used for collecting other floc which is not introduced into the floc separation chamber; and an image acquisition device is mounted beside the floc separation chamber. Due to the design of the hollow settling column, the sediment floc is in a settling state; due to the designed floc separation chamber, one part of detected floc is separated from the other floc, and the condition that too much floc is mutually interfered is avoided, so that the measurement accuracy is obviously improved and due to the image acquisition device, the floc image is acquired so as to analyze the particle size and settling rate of the floc formed after cohesive sediment flocculation and settling.

Disclosed are a rapid evaluation system and a rapid evaluation method for electrostatic coalescence. By the rapid evaluation system and the rapid evaluation method, coalescence effect of coaxially cylindrical electrostatic coalescers can be evaluated, and electric field parameters can be optimized. The rapid evaluation system comprises a power supply device, a small electrostatic coalescer and a measuring device. The power supply device refers to a waveform generator and a high-voltage current amplifier and is capable of applying high voltage to the small electrostatic coalescer to enable water drops in a water-in-oil emulsion to coalesce. An oscilloscope connected to the high-voltage current amplifier is capable of displaying voltages and currents between two electrodes in real time and collecting and storing the voltages and the currents for energy consumption ratio analysis. Changes before and after water drop grain diameter electrification are analyzed by combing microscopic photographing with an image processing technique, and water settling rate and separation effect can be analyzed by a gravity settling method, so that the optimal electric field parameters are determined. The rapid evaluation system and the rapid evaluation method have the advantages of convenience in use and rapidness in testing, the basis can be provided for design of the electrostatic coalescers and equipment selection, equipment design is more reasonable, and high efficiency in use is achieved.

The invention discloses a method for dispersing, purifying and/or assembling nano gold rods. According to the method, 'dendritic' surfactant C18N3 with acid and alkali response is used as a protective agent, and a good dispersion system of the nano gold rods can be obtained under low surfactant concentration. At normal temperature, the system is regulated to alkali through standard NaOH, so that the settling rates of the nano gold rods and other nano particles in the system are different and the nano gold rods are purified; and the pH of the purified nano gold rod system is regulated through HCl, so that a large-area assembly of the nano gold rods can be obtained. The method is mild in reaction conditions, can be operated at the normal temperature, is easy to operate, short in reaction period, beneficial to reducing time and cost, cheap and readily available in raw materials required by the reaction, high in repeatability and high in purification yield, and reduces the production cost. The reaction is simple and feasible, factors which are difficult to control are eliminated, and artificial control of product yield and assembly area can be well realized.

The invention discloses high-concentration neutral ink color paste and a preparation method thereof. The solid content of the high-concentration neutral ink color paste is not lower than 40 weight percent, ; the particle size D90 of color paste particles is not greater than 250nm, ; the high-speed settling rate of the color paste is not greater than 50 micrometers/min, and the color paste has lower viscosity of 70 to 200mPs. The invention also provides a preparation method of the high-concentration neutral ink color paste. The preparation method comprises the following steps of firstly, generally performing amidation, esterfication, ammonia salt treatment and modification on conventional styrene-maleic anhydride to obtain a water soluble dispersant; secondly, adding the water soluble dispersant and pigment according to a certain proportion for stirring and dispersing; thirdly, performing high-speed grinding and coarse grinding, lengthening a long-chain polyether modified silicone surfactant by coarse grinding; fourthly, performing fine grinding and impurity filtering treatment to obtain the high-concentration neutral ink color paste. The high-concentration neutral ink color paste prepared by the invention has high concentration, lower viscosity and better stability, has excellent matching property for preparing neutral ink at a later stage, and has a broad application prospect in the application of blending the neutral ink.

The invention discloses a process of extracting high-purity pectin from apple pomace, and relates to the technical field of pectin extraction. The process comprises the following steps: (1) rinsing for impurity removal; (2) powdering; (3) acid extraction; (4) decoloration; (5) concentration; (6) pectin settlement; (7) purification; (8) drying and powdering. According to the process, soluble sugarand part of pigments are removed from the apple pomace through rinsing operation; the apple pomace is granulated through the powdering operation to promote rapid leaching of the pectin during subsequent acid extraction; the pigments in a pectin extracting solution are effectively removed through the decoloration operation; by use of a pectin settling agent, the pectin settling rate and the pectinpurity are improved, so that the content of galacturonic acid in the prepared finished pectin is up to 85 percent or above, and the pectin extraction rate is up to 90 percent or above.