31results about How to "Increase the solid-to-liquid ratio" patented technology

The invention provides a method for producing light calcium carbonate and magnesium sulfate heptahydrate from salty mud. The method includes mixing the salt mud (mainly comprising magnesium hydroxideand calcium carbonate) produced by a brine refining process with calcium sulfate, adding a certain amount of water for pulping, injecting carbon dioxide for a carbonization reaction to convert the calcium sulfate and the magnesium hydroxide into calcium carbonate sediments and soluble magnesium sulfate, and performing filtration to separate calcium and magnesium salt; drying a filter cake to obtain a light calcium carbonate product, and concentrating, crystalizing and drying filtrate to obtain a magnesium sulfate heptahydrate product. The method has the advantages that the greenhouse gas carbon dioxide is fastened while the light calcium carbonate and magnesium sulfate heptahydrate products are obtained through compressive utilization of the calcium and magnesium salt in the salty mud, harmless comprehensive utilization of the salty mud is realized, and certain economic benefits can be acquired.

The invention relates to a spiral stirrer of a vertical type spiral stirring grind. The spiral stirrer is characterized by being provided with a transmission shaft, and the circumference surface of the transmission shaft is provided with a spiral twined spiral supporting plate; the spiral supporting plate is provided with a spiral lining plate the shape of which is same with the twined shape, the width of the spiral lining plate is greater than the spiral supporting plate, and a half of the spiral supporting plate is packaged in the spiral lining plate; the spiral lining plate takes the spiral middle diameter as a boundary, the included angle of the normal fracture surface upper boundary and the horizontal surface is 2-3 degrees in the inner side of the spiral middle diameter, the included angle of the normal fracture surface upper boundary and a horizontal surface is 8-12 degrees in the outer side of the spiral middle diameter, the spiral lifting angle at a middle diameter position is 25-35 degrees, and the spiral height-diameter ratio is 1.0-1.1. The spiral stirrer provided by the invention has the advantages that a specific structure of the spiral supporting plate and the spiral lining plate is adopted, a grinding material and a grinding medium are fully dispersed and contacted, the full turbulent motion is generated, a slurry stream fluid microvitum has the stable Lagrange streamline motion trail, and the grinding efficiency of a stirring grind machine is high.

A kind of wet-process zirconium-doped concentration gradient nickel-cobalt-aluminum ternary precursor and preparation method thereof, the chemical general formula of the nickel-cobalt-aluminum ternary precursor is Ni x CoyAl z (OH) 2 , where x+y+z=1, and 0.3≤x≤0.9, 0.01≤y≤0.4, 0.01≤z≤0.4, the Zr element accounts for 0.001%-3% of the total mass of the nickel-cobalt hydroxide precursor; ternary The precursor is composed of three layers, the inner layer is zirconium-doped nickel-cobalt binary precursor, the molecular formula is: Ni x co y (OH) 2 , whose outer layer is a ternary precursor of zirconium-doped nickel-cobalt-aluminum, whose molecular formula is: Ni x co y al z (OH) 2 , the intermediate layer is a concentration gradient precursor between the zirconium-doped nickel-cobalt binary precursor and the zirconium-doped nickel-cobalt-aluminum ternary precursor, and the present invention also includes the preparation method of the nickel-cobalt-aluminum ternary precursor. The zirconium-doped nickel-cobalt-aluminum ternary precursor of the present invention has narrow particle size distribution and good particle morphology; the complexation controls the crystallization co-precipitation to make the doping elements uniform, and the positive electrode precursor prepared by using it has high specific capacity, good cycle stability and processing performance Well, stable performance.

The invention provides a method for preparing a manganese sulfate electrolyte by leaching pyrolusite through sulfur dioxide. According to the main concept, the method comprises the steps that only a part of an anolyte and whole-process pyrolusite are used for preparing a fluid, and after the fluid reacts with the sulfur dioxide, a high-concentration manganese sulfate solution is obtained; after the other part of the anolyte is neutralized and subjected to liquid-solid separation, a low-concentration manganese sulfate solution with the manganese sulfate concentration being identical to that ofthe prior anolyte is obtained; and the two manganese sulfate solutions are blended to obtain the qualified electrolyte with the manganese sulfate concentration meeting electrolysis requirements. By adopting the method, the utilization efficiency of the sulfur dioxide and the pyrolusite in the leaching process can be improved, and the capital construction cost and operation cost of a leaching technology and a leachate impurity removing technology are lowered.

The invention discloses a method for dilute acid pretreatment of plant straws by microwave-cyclic compression percolation. The method comprises: first conducting standing infiltration on straw particles with a dilute acid solution, then loading the straw particles into a cylindrical reactor, performing fed-batch of the dilute acid solution to the reactor, and at the same time, applying the action of microwave and compressing the straw particles, and discharging the liquid in the reactor; after solid-liquid separation, re-injecting the acid solution and dispersing the straw particles uniformly; carrying out fed-batch of the filtrate obtained from the separation to the reactor, and at the same time, applying the action of microwave and compressing the straw particles, and discharging the liquid in the reactor; and repeating the operations till the end of the reaction. By infiltrating the straw particles in the acid solution in advance and adopting a filtrate cyclic compression mode, the method provided in the invention reduces the concentration and dosage of the acid solution, increases the reaction product concentration, and enhances the reaction speed simultaneously.

The invention provides a multi-stage oval superposed solid-liquid separator comprises two stages of carrying surfaces which are connected end to end, wherein each stage of carrying surfaces can be used for carrying an treated object with a certain solid-liquid ratio to the tail end from the beginning end and dehydrating the treated object in the process; the treated object is longitudinally conveyed from the front-stage carrying surface to the rear-stage carrying surface, and the terrain at the tail end of the front-stage carrying surface is higher than that at the beginning end of the rear-stage carrying surface to form terrain difference; a guide structure is arranged between the adjacent two stages of carrying surfaces for guiding the treated object from the tail end of the front-stage carrying surface to the beginning end of the rear-stage carrying surface. After being conveyed to the tail end through the front-stage carrying surface, the treated object is turned over and dropped to the beginning end of the rear-stage carrying surface by virtue of the guide structure, and the water in the treated object is turned over and guided out, so that the water of the treated object is discharged in a facilitated manner, the solid-liquid ratio of the treated object is increased, water produced by squeezing is reduced, water draining requirements of a liquid outlet structure are lowered, and the dehydrating effects of the squeezed treated object are improved.

The invention discloses a device for preparing monodisperse spherical porous beta-TCP particles. The device comprises an outer shell as well as a crucible and a collection bin which are arranged in the outer shell, wherein the collection bin is arranged at the bottom of the outer shell, and the crucible is arranged at the upper part of the collection bin; a stirring bar is arranged in the crucible, and the upper end of the stirring bar is connected with piezoelectric ceramic; an opening is formed in the bottom of the crucible, and a baffle is also arranged at the bottom of the crucible; a hole is formed in the baffle, and an upper vent tube is arranged at the upper part of the outer shell; a lower vent tube is arranged at the middle lower part of the outer shell, and a pump body is also arranged at the bottom of the outer shell. The invention also discloses a method for preparing the monodisperse spherical porous beta-TCP particles. The method comprises the following steps of pre-processing of raw powder, suspension configuration, POEM ejection, and collection of particles and sintering. The beta-TCP particle prepared by the invention has the advantages of communicated porous structure, uniform and controllable particle size, high surface sphericity and the like.

The invention relates to a double-stage material-pushing centrifuge distribution acceleration plate device and aims to increase solid-liquid ratio of materials during operation of a centrifuge and use the liquid discharged in advance to wash the screen of a separation section. The device comprises a feed pipe, a primary rotary hub, a material pushing plate located in the primary rotary hub and a primary rotary hub screen assembled between the primary rotary hub and the material pushing plate and is characterized in that a horn-shaped hole is formed in the center of the material pushing plate, an inner distribution acceleration plate is disposed at the horn-shaped hole, an outer distribution acceleration plate is disposed on the outer side of the inner distribution acceleration plate, a sealed space is disposed on the outer side of the outer distribution acceleration plate, a nozzle penetrating the material pushing plate is disposed at the edge of the sealed space, and a screen area is disposed on each of the inner distribution acceleration plate and the outer distribution acceleration plate. The double-stage material-pushing centrifuge distribution acceleration plate device has the advantages that material solid-liquid ratio is increased, the thickening is achieved by the power and containing space of the device, separation effect is increased, and application range of the centrifuge is expanded.

The invention discloses a ternary precursor with a narrow distribution of different particle sizes and a preparation method thereof. The complexation-controlled crystallization co-precipitation method is adopted, and nucleation, growth, and nucleation in a continuously increasing solid-liquid ratio environment are carried out in a first reaction kettle. , Nickel-cobalt-manganese soluble salt solution and sodium hydroxide aqueous solution carry out co-precipitation reaction under the complexation of ammonia to prepare narrowly distributed crystal nuclei, and then transfer part of the small particle size nickel-cobalt-manganese hydroxide in the first reactor to Go to the second reactor to increase the solid-liquid ratio to grow to a medium particle size, and then transfer part of the material from the second reactor to the third reactor to increase the solid-liquid ratio and continue to grow to the required large particle size. Not only can three kinds of nickel-cobalt-manganese hydroxide precursors with different particle sizes, uniform element distribution, good sphericity, narrow particle size distribution and high tap density be obtained at the same time, but also because the materials in the second reactor and the third reactor The particle size itself is large, and the feeding speed can be increased to a certain extent during the regrowth, and the production efficiency can be improved.

The invention discloses a preparation method of pachyman sulfate. The preparation method comprises the following steps of: adding sulfamic acid and an organic solvent in a reaction bottle of a rotary evaporator; preheating to reaction temperature; after fully dissolving the sulfamic acid, adding dried pachyman powder; vacuuming a reaction system; cooling to room temperature after the reaction is finished; adjusting the pH of reaction solution to 9-10 with saturated alkali solution; continuously vacuuming to remove ammonia and repeatedly vacuuming until the reaction solution has no ammonia smell; maintaining the pH value to be over 7 until the pH value does not go down; then adding ethanol; precipitating polysaccharide sulfate; filtering and then dissolving in water again; filtering; placing in an ultrafilter to desalinate and concentrate; and detecting residual quantity of free sulfate radicals in eluent by using saturated barium chloride solution until no white precipitate is produced. According to the preparation method, the sulfation efficiency is greatly increased, polysaccharide molecule degradation and production of sugar ring double ring are suppressed, the color of a product becomes light, and the final quality of the product is obviously improved.

The invention discloses a process for extracting sugar with low crystallization fiber. Lignocellulose is made into slurry, and then sieved by an ultra-frequency vibrating screen to separate the crystallized fiber to obtain an aqueous solution of low crystallization fiber, which is used after solid-liquid separation. Cellulase enzymatically hydrolyzes solid materials to obtain glucose. The process of the invention better realizes the comprehensive utilization of agricultural and forestry straw biomass, improves the utilization rate of agricultural and sideline products, and solves the problems of the environment and land; separates and extracts low-crystalline fibers to make the best use of them; utilizes low-crystalline fibers With large specific surface area, small physical size and good mass transfer effect in aqueous solution, it is very suitable for enzymatic saccharification, which can reduce the amount of enzyme used, increase the solid-liquid ratio, and reduce the cost of enzymatic hydrolysis.

The invention discloses a method for oxidizing CaSO3 in desulfurized fly ash in an alkaline condition. The method comprises the following steps of: (1) adding 2 to 10 times water by weight to the desulfurized fly ash, and uniformly stirring to obtain desulfurized fly ash slurry; (2) slowly adding H2O2 and / or persulfate solution with weight concentration being 10 to 30% of to the desulfurized fly ash slurry, wherein the molar mass ratio of H2O2 and / or persulfate to CaSO3 is 1- 2: 1; and (3) stirring and reacting mixtures of the desulfurized fly ash slurry, H2O2 and / or persulfate solution for 0.5 to 4 hours. According to the oxidization method, the pH of the solution does not need to be adjusted and metallic ions do not need to add, so that the reaction conditions are mild, and as a result, the oxidization cost is reduced, and the corrosion to the equipment is reduced; and the method has the characteristics of short reaction time, high efficiency, etc.

The method for treating electrolytic manganese slag in the present invention uses electrolytic manganese anolyte to flush the electrolytic manganese slag into slurry at high pressure, and the high-acid and low-manganese characteristics of the electrolytic manganese anolyte cooperates with high-pressure conditions to make the manganese slag filter cake into slurry thoroughly and greatly improve The recovery rate of metal manganese and ammonium sulfate in manganese slag; the filter cake is washed with water on the filter press, which avoids the disadvantages of inconspicuous washing effect and difficult manganese slag melting when manganese slag is compacted and then washed. Recover acid-soluble manganese and ammonium sulfate, while reducing water consumption; wash the filter cake with lye on the filter press, and the lye is poured into the filter press, vertically passing through the filter cake and continuously circulating, so as to realize the solidification of residual manganese in the manganese slag and ammonia nitrogen removal, the solid-to-liquid ratio is large, significantly reducing the consumption of chemicals; the treatment method of the electrolytic manganese slag of the present invention, the recovery rate of water-soluble manganese ≥ 90%, the recovery rate of ammonium sulfate ≥ 90%, the moisture content of manganese slag ≤ 28%, reaching The purpose of harmless treatment of electrolytic manganese slag.