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

The invention discloses a high-density and small-particle size nickel-cobalt-manganese hydroxide and a preparation method thereof. For the high-density and small-particle size nickel-cobalt-manganesehydroxide provided by the invention, a general chemical formula is NixCoyMnz(OH)2, wherein x+y+z=1, x is larger than or equal to 0.3 and smaller than or equal to 0.8, y is larger than or equal to 0.1and smaller than or equal to 0.4, and z is larger than or equal to 0.1 and smaller than or equal to 0.4; the particle sizes are d10 larger than or equal to 2 microns, d50 equal to 2.5-4 microns and d90 smaller than or equal to 6 microns, the tap density is larger than or equal to 1.4g/cm<3>, the specific surface area is 5-20m<2>/g, and the shape is spherical or spheroidal. The invention also discloses the preparation method of the high-density and small-particle size nickel-cobalt-manganese hydroxide. The preparation method is strong in controllability, can stably control the particle sizes ineach production batch without using a surfactant and is low in production cost, high in efficiency and good in physicochemical index of a final product.

The invention discloses a wet-method zirconium-doped concentration-gradient nickel-cobalt-aluminum ternary precursor and a preparation method thereof. The nickel-cobalt-aluminum ternary precursor hasa chemical general formula of NixCoyAlz(OH)2, wherein x+y+z=1, 0.3<=x<=0.9, 0.01<=y<=0.4, and 0.01<=z<=0.4; the Zr element accounts for 0.001%-3% of the total mass of the nickel-cobalt hydroxide precursor, the ternary precursor consists of three layers, and the inner layer is a zirconium-doped nickel-cobalt binary precursor with a molecular formula of NixCoy(OH)2; and the outer layer is a zirconium-doped nickel-cobalt-aluminum ternary precursor with a molecular formula of NixCoyAlz(OH)2, and the intermediate layer is a concentration-gradient precursor between the zirconium-doped nickel-cobaltbinary precursor and the zirconium-doped nickel-cobalt-aluminum ternary precursor. The invention also includes the method for preparing the nickel-cobalt-aluminum ternary precursor. The zirconium-doped nickel-cobalt-aluminum ternary precursor has a narrow particle size distribution and good particle morphology, the doped element is distributed uniformly through complex controlled crystallizing co-precipitation, and a positive-electrode precursor prepared from the zirconium-doped nickel-cobalt-aluminum ternary precursor has high specific capacity, good cycling stability, good processability andstable performance.

A process for separating crystal slurry in the production of sodium carbonate includes such steps as synthesizing sodium bicarbonate crystal in carbonizing tower, discharging the crystal slurry, hydraulic cyclone separating, alkali filtering to obtain solid and calcining. Its advantage is low load of alkali filter to increase its productivity by 20%.

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 relates to a mineral additive for shotcrete as well as a preparation method and application of the shotcrete. The mineral additive comprises the following components in percentage by weight: 60%-90% of clinker containing aluminum active minerals, 10%-35% of gypsum and 0-5% of chemical additive. A concrete accelerator comprises a liquid accelerator and the shotcrete mineral additive which are respectively added into concrete at different moments. According to the invention, when the wet-spraying concrete is sprayed out, the reaction can be quickly generated, the solid-to-liquid ratio is quickly increased, the concrete is quickly tackified and quickly coagulated and hardened, hydrated minerals generating strength are continuously increased, the strength is continuously improved, hydrated slurry is more compact, the durability such as later strength, sulfuric acid corrosion resistance and the like is greatly improved, and therefore, the common problem of wet shotcrete is fundamentally solved.

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 belongs to the technical field of environment-friendly wastewater and hazardous waste treatment, and provides a method for producing high-purity ferrous sulfate water and ferrous sulfate heptahydrate by using waste acid. The method comprises the following steps: mixing waste nitric acid or waste acid mixed liquor with a sulfuric acid reagent in proportion; adding iron powder, and performing stirring for 0.5-2 hours; adding a precipitator, then adding liquid caustic soda to adjust the pH value to 4.5-4.8, and adding sodium sulfide; carrying out filter pressing on the mixed solution to obtain high-purity ferrous sulfate water; adding a small amount of concentrated sulfuric acid into the high-purity ferrous sulfate water, pumping the mixture into a negative pressure evaporator for evaporation, discharging the mixture into a crystallization kettle for cooling crystallization, and discharging the mixture into a centrifugal machine for centrifugation to obtain the high-purity ferrous sulfate solid. According to the invention, through reasonable design of process steps and actual reaction, recycling of the waste nitric acid and the mixed acid is realized, waste of ferric salt resources is avoided, the problems of difficult treatment and high-cost emission of the waste nitric acid and the mixed acid are solved, resource comprehensive treatment and utilization of the waste nitric acid and the mixed acid are realized, and the method is simple in process, lower in cost and green and environment-friendly.

The invention discloses a treatment method of electrolytic manganese residue. Electrolytic manganese anode liquor is adopted for high-pressure flushing of electrolytic manganese slagging slurry, the characteristics of high acid and low manganese of the electrolytic manganese anode liquor are matched with the high pressure condition, manganese residue filer cake slurrying is thorough, the recyclingrate of manganese metal and ammonium sulfate in the manganese residue can be greatly improved, a filter cake is subjected to washing by clean water on a filter press, the defects that after manganeseresidue compaction, cleaning is carried out, the cleaning effect is not obvious, and the manganese residue is not prone to being dissolved into liquor can be overcome, the acid soluble manganese andthe ammonium sulfate can be efficiently recycled, the clean water consumption amount is reduced, on the filter press, the filter cake is subjected to alkali cleaning, the alkali liquor is put into thefilter press, and perpendicularly penetrates through the filter cake and continuously circulates, curing of residual manganese in the manganese residue and removing of ammonia nitrogen are achieved,the solid liquid ratio is large, the drug consumption amount is obviously reduced, according to the treatment method of the electrolytic manganese residue, the water soluble manganese recycling rate is larger than or equal to 90%, the recycling ammonium sulfate is larger than or equal to 90%, the manganese residue water containing rate is smaller than or equal to 28%, and the aim of harmless treatment of electrolytic manganese residue is achieved.

The invention discloses a system and a method for producing calcium carbonate dry powder. Compared with the prior art, the system comprises a drying and back mixing stirrer, a drying and scattering machine, a drying and scattering dust remover, a dust remover discharging screw conveyor and a comprehensive tank, wherein the drying and scattering machine is connected with the drying and back mixingstirrer; the drying and scattering dust remover is connected with the drying and scattering machine; the dust remover discharging screw conveyor is connected with the drying and scattering dust remover; the comprehensive tank is connected with the dust remover discharging screw conveyor; the comprehensive tank is connected with the drying and back mixing stirrer. Compared with the prior art, according to the system for producing the calcium carbonate dry powder, provided by the invention, produced calcium carbonate powder is higher in quality, the processing fluidity of a calcium carbonate material is favorably increased, and the comprehensive quality of the calcium carbonate material is increased, so that the production stability and the product quality of an air-permeable membrane are increased. The invention also provides a method for producing the calcium carbonate dry powder. The method provided by the invention has the beneficial effects.

The invention discloses a modified calcium carbonate dry powder production system which comprises a drying back mixing agitator; a drying dispersing machine connected with the drying back mixing agitator; a drying dispersing dust remover connected with the dry dispersing machine; an integrated tank connected with the drying dispersing dust remover and the drying back mixing agitator; an acid-modifying machine connected with the integrated tank; an acid-modifying dust remover connected with the acid-modifying machine; a bag filter connected to the acid-modifying dust remover; a product storagetank connected to the bag filter; a packaging machine connected to the product storage tank compared with the prior art. Compared with the prior art, the modified calcium carbonate dry powder production system produces modified calcium carbonate powder with better quality, improves the processing flow property of a calcium carbonate material, improves the overall quality of the material and further improves the production stability and the product quality of a breathable membrane. The invention also provides a modified calcium carbonate dry powder production method which also has the above advantages.

The invention provides an ellipse superposition solid-liquid separation apparatus. The apparatus comprises a natural dehydration segment used for bearing and conveying a processed material and gradually realizing natural hydration of the processed material in the bearing and conveying process, and a squeezing dehydration segment used for receiving the processed material naturally dehydrated by the natural dehydration segment, further realizing squeezing dehydration on the processed material by using a squeezing board and discharging, a ratio of the total area of water drainage gaps arranged on a natural dehydration segment carrying surface to the total area of the natural dehydration segment carrying surface is greater than 1:10 and smaller than 4:10, a ratio of the total area of water drainage gaps arranged on a squeezing dehydration segment carrying surface to the total area of the squeezing dehydration segment carrying surface is greater than 1:15 and smaller than 1:5, a ratio of the length of the natural dehydration segment to the length of the squeezing dehydration segment is greater than 1:1 and smaller than 4:1, and the length of the natural dehydration segment is at least 1.5m; and the processed material conveying speed of the natural dehydration segment and the processed material conveying speed of the squeezing dehydration segment are not greater than 0.3m/s respectively. The ellipse superposition solid-liquid separation apparatus has the advantages of compact structure, high dehydration efficiency and good stability.

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.