74results about How to "Increased precipitation rate" patented technology

The invention relates to a method for preparing cryolites by using an aluminum electrolytic cell cathode carbon block alkaline leaching solution, and belongs to preparation methods of the cryolites. The method comprises the following steps: grinding aluminum electrolytic cell cathode carbon blocks finely to a certain particle size, performing slurry mixing with alkali liquor, and performing agitation leaching at a heating temperature of 20-90 DEG C; then performing filtration to obtain a first filtrate and a first filter residue; adding sodium fluoride and a small amount of Na3AlF6 solids into the first filtrate; then controlling the speed of introducing NH3-rich gas or adding NH4F to generate a deposit under the action of heating agitation; and after reaction, performing filtration to obtain a second filtrate and a second filter residue, and drying the second filter residue at 100-150 DEG C to obtain a cryolite product. According to the method provided by the invention, by replacing acid leaching with alkali leaching, the requirement of a production process on equipment is reduced, treatment processes including floatation are reduced, an absorption process of hydrogen fluoride is reduced, and the treatment process is simplified; a high-temperature treatment process is not used, so that the energy consumption is reduced; and by adding a crystal seed, high-quality cryolites with uniform particle sizes are generated under the condition that the airflow rate is controlled. The method provided by the invention is simple in process, achieves closed cycle, is high in resource utilization rate and avoids secondary pollution.

The invention discloses a sewage treatment device for a landscape river way. The sewage treatment device comprises a sludge separation tank, an oxygenation tank and a disinfection tank, wherein a mixing cavity, a settling cavity and a sludge collecting cavity are sequentially arranged in the sludge separation tank from top to bottom, an oxygenation pipe and a rotating device are arranged in the oxygenation tank, and a flow dividing device and a heating plate are arranged in the disinfection tank. A sewage treatment method comprises the following steps: (1) filtering suspended matters; (2) separating sludge; (3) carrying out oxygenation treatment on sewage; (4) disinfecting the sewage; (5) inspecting the water quality; and (6) carrying out cleaning, inspection and repair. The sewage treatment device is simple in structure and strong in practicability; the sewage is gradually treated by virtue of the sludge separation tank, the oxygenation tank and the disinfection tank, so that the sewage treatment quality is effectively improved; meanwhile, by utilizing an oxygenation generator and an oxygenation pipe, the dissolved oxygen content in the sewage is increased, and the self-cleaning capacity of the river way is improved; and the device is high in working efficiency and low in energy consumption, the sewage treatment effect is obvious, and the comprehensive utilization rate is effectively increased.

The invention belongs to the field of aluminum alloy material manufacturing and relates to an Al-Mg-Si-Cu alloy with a high energy absorption property, the alloy is prepared by the following elementsin percentage by weight: 0.6-1.0% of Si, less than or equal to 0.35% of Fe, 0.4-0.7% of Cu, less than or equal to 0.3% of Mn, 0.6-1.0% of Mg, 0.1-0.3% of Cr, 0.1-0.3% of V, less than or equal to 0.1%of Ti, less than or equal to 0.05% of the rest single impurity content, less than or equal to 0.15% of total impurity and the balance of Al. in the preparation method, the stretched and straightened aluminum alloy profile is subjected to two-stage artificial aging within 24 hours, the first-stage artificial aging process is 150+ / -5 DEG C * (1-2)h, and the second-stage artificial aging process is 220+ / -5 DEG C * (4-5)h; aluminum alloy materials with better mechanical properties and energy absorption properties can be produced by adjusting alloy compositions and subsequent production processes,the safety of the aluminum alloy as an energy absorption element is improved, and the application range of the aluminum alloy in traffic products is enlarged.

A method is described for electroplating a cylindrical inside surface of a work-piece extending substantially over a semi-circle, with an electrolyte being conveyed from a bath in a circulation through a gap between the inside surface and a revolving guide means. In order to ensure advantageous coating conditions it is proposed that the electrolyte is conveyed with the help of the guide means immersed only partly in the bath in the circumferential direction through the gap between the guide means and the work-piece guided outside of the bath.

The invention provides a method for preparing lithium carbonate from plateau carbonate bittern. The method comprises the following steps: subjecting original carbonate bittern A to evaporation before autumn and winter, adjusting the concentration of lithium ions so as to allow the lithium ions not to be precipitated in the form of minerals and introducing the carbonate bittern A to a deep-pool salt field for evaporation when the concentration of lithium ions reaches 1.2 to 1.8 g / L; as considerable mirabilite decahydrate is precipitated at first when temperature is -15 to -5 DEG C and the concentration of lithium ions rapidly increases, carrying out solid-liquid separation so as to obtain bittern B when the concentration of sulfate ions decreases to 4 to 7 g / L and the concentration of lithium ions increases to 2.6 to 3.5 g / L; introducing the bittern B into a heating system for heating to 20 to 60 DEG C, allowing a first batch of lithium carbonate concentrate and bittern C to be precipitated; subjecting the bittern C to refrigeration at a temperature of -20 DEG C or below so as to realize precipitation of mixed salt I and carrying out solid-liquid separation when the concentration of sulfate ions decreases to 15 g / L or below and the concentration of lithium ions increases to 2 g / L or above so as to obtain bittern D; and continuing evaporating the bittern D, adding bittern with a carbonate ion concentration of 60 g / L or above when the concentration of lithium ions reaches 2.6 to 3.5 g / L again and carrying out heating to 20 to 60 DEG C so as to allow a second batch of lithium carbonate concentrate to be precipitated.

The invention relates to a method for applying coal-based solid waste to overlying strata isolation grouting filling, according to different properties of coal gangue, coal ash and coal slime in the coal-based solid waste during overlying strata isolation grouting filling, the overlying strata isolation grouting filling performance of coal gangue powder can be improved by adding the coal ash and the coal slime, and when the coal ash and the coal slime reach a certain proportion, the coal ash and the coal slime are added into the coal-based solid waste to improve the overlying strata isolation grouting filling performance. The fluidity of the coal gangue powder can be improved, and the precipitation rate of the coal gangue powder is reduced. Furthermore, according to the state of the overlying strata space, the overlying strata isolation grouting filling is divided into the four stages of starting, developing, stabilizing and ending, and according to the development characteristics of fractures under the overlying strata during grouting in the four stages and the flow characteristics of slurry, the different stages of overlying strata isolation grouting filling are provided; different mixing proportions are adopted for overlying strata isolation grouting filling; the application problem of the coal gangue in grouting filling is solved, and the dilemma that materials of the overlying strata isolation grouting filling technology are insufficient and the dilemma that the coal gangue occupies land and pollutes the environment can be effectively improved.

The invention discloses a nucleic acid extraction and purification device, which comprises a feeding pipe, a primary purification mechanism, a reagent feeding mechanism, a transfer mechanism, a secondary purification mechanism and a sample outlet tube, and the feeding pipe is connected to the primary purification mechanism. On the left side, the right side of the primary purification mechanism is connected to the left side of the transfer mechanism through the first connecting pipe, the upper end of the primary purification mechanism is connected to a reagent feeding mechanism, and the right side of the transfer mechanism is connected to the second The upper end of the first-stage purification mechanism is connected, the lower end of the second-stage purification mechanism is connected with a sample outlet pipe, a first one-way valve is installed in the first connecting pipe, and a second one-way valve is installed in the second connecting pipe. The present invention realizes the multi-stage extraction and purification of materials through the mutual cooperation of the primary purification mechanism, the reagent feeding mechanism, the transfer mechanism and the secondary purification mechanism, and improves the extraction and purification efficiency and purity.

The invention belongs to the related technical field of Cr-Ni series stainless steel welding, and discloses a method and device for improving corrosion resistance of MIG welding Cr-Ni series stainless steel. The method comprises the steps that in the protective gas atmosphere, a to-be-welded piece is welded through laser beam assisted MIG electric arcs during MIG welding, wherein the protective gas is mixed gas of inert gas and nitrogen, the gas flow ratio of the inert gas to the nitrogen is 22.5:2.5-17.5:7.5, and the energy of the laser beam is 0.6-1.5 KW, so that the laser irradiates the surface of the to-be-welded piece to generate metal steam to provide stable cathode spots for MIG electric arcs to promote MIG electric arc ionization; and meanwhile, the nitrogen is subjected to ionization reaction, so that the nitrogen content of a molten pool is increased, then the solidification temperature interval of an austenite phase is expanded, transformation from ferrite to austenite is accelerated, and the corrosion resistance is improved.

The invention discloses an underground integrated domestic sewage treatment device and a method thereof, and belongs to the field of purification of the domestic sewage. The underground integrated domestic sewage treatment device comprises a grilling tank, an adjusting tank, an anaerobic digestion tank, an anaerobic biological filtration tank, an aerobiotic biological filtration tank I, an aerobiotic biological filtration tank II, an aerobiotic biological filtration tank III, a vertical flow sedimentation tank and a control chamber, wherein the underground integrated domestic sewage treatment device is an underground stereoscopic integrated device; the control chamber comprises an upper layer part and a lower layer part; the upper layer part is arranged at the upper part of the control chamber; an electric control box and an ultraviolet device are arranged in the upper layer part; a fan and a chemical adding device are mounted at the lower layer part. The underground integrated domestic sewage treatment device is small in occupied area, convenient in drainage and low in energy consumption; the energy conservation and environment protection are facilitated; by virtue of the auxiliary adoption of the chemical treatment process on the main basis of biological degradation, the emission of the water with the up-to-standard water quality is ensured.