38results about How to "Avoid dissolution loss" patented technology

The invention belongs to the technical field of environmental monitoring, in particular to a pretreatment method for dehydrating, dedusting and retaining components to be detected in boiler smoke detection. The method includes that smoke is fed into corresponding buffer solution according to the properties of the smoke to be detected, components with properties opposite to the component to be detected are removed, and meanwhile water vapour and dust in the smoke are absorbed; the buffer solution is divided into sulphur retaining buffer solution and ammonia retaining buffer solution; and sulphur retaining drying agent or ammonia drying agent mixed by analytical reagent is fed in when the humidity of the smoke after being treated is more than or equal to 50%, so as to realize further dehydration. By adopting the method of the invention, dissolution loss of sulphur dioxide or ammonia can be avoided even if cooling dehydration is carried out on high humidity low concentration smoke, and meanwhile the technical problem that dedusting instrument pipeline is easy to be blocked can be efficiently solved, so that a measuring instrument can continuously operate for a long time in an almost dry and dustless environment and is difficult to damage and service life is prolonged.

The invention discloses a Pt or Au modified porous PdFe intermetallic compound, a preparation method and an application thereof, and belongs to the technical field of electrochemistry. The intermetallic compound is a nano particle, the inner core of the nano particle is an ordered PdFe intermetallic compound, the surface is a porous structure with evenly distributed Pd, and the surface of the porous structure is decorated with Pt or Au. The preparation method is to use palladium acetate and iron salt as the metal source, and load it on the carbon carrier, and then thermally decompose the acetate in a protective atmosphere to obtain a supported PdFe intermetallic compound. After etching away the Fe on the surface, use Surface modification technology prepared Pt or Au modified PdFe intermetallic compounds with porous surface and ordered inner core. The Pt or Au modified porous PdFe intermetallic compound prepared by the invention shows high activity and stability as a fuel cell cathode oxygen reduction reaction catalyst and an anode hydrogen oxidation reaction catalyst.

The invention relates to a bridge construction pier concrete curing device including a load bearing platform; a plurality of vertically lifting suspension blocks arranged below the bearing platform are arranged on the bearing platform; the multiple suspension blocks are evenly distributed along the outer edge of the bearing platform; a spraying module is provided with a flat nozzle and a three-waypipe, the flat nozzle faces the inner side of the bearing platform and is communicated with any connector of the three-way pipe, and the other two connectors of the three-way pipe are connected witha water inlet pipe and an air inlet pipe respectively; an air compressor is connected with an air heater in series, one end of the water inlet pipe is communicated with the three-way pipe, and the other end of the water inlet pipe is communicated with a reservoir; one end of the air inlet pipe is communicated with the three-way pipe, and the other end of the air inlet pipe is communicated with theoutput end of the air heater; a plurality of lifting shafts are arranged on the bearing platform; by using the device, water mist humidifying maintenance, water mist heating, steam heating and airflow heating can be conducted on the pier, the water utilization rate is high, and different maintenance requirements can be met.

The invention relates to the field of chemical industry, in particular to a method for recovering magnesium from ferronickel slag, which comprises the steps of immersing the ferronickel slag in concentrated sulfuric acid at atmospheric pressure, adding crystal seeds, and crystallizing out magnesium sulfate. The magnesium in the ferronickel slag is converted into magnesium sulfate for recovery of magnesium by adopting the all-wet process. The process is simple, easy to operate, requires low equipment, and has a high recovery rate of magnesium. Magnesium sulfate has a wide range of applications and high added value. It can improve the comprehensive utilization rate of nickel-iron slag.

The invention provides a modification method of fenugreek polysaccharide gum. Graded screening is utilized to remove impurities with high water-insoluble substance content in the fenugreek polysaccharide gum sheet; and a physical process is utilized to perform modification (wetting fenugreek polysaccharide gum with a 15% ethanol water solution) and wall-breaking tackifying treatment, thereby greatly enhancing the apparent viscosity of the fenugreek polysaccharide gun and greatly lowering the water-insoluble content in the fenugreek polysaccharide gum.

The invention discloses a method for producing hydrogen chloride and sodium hydrogen sulfate crystals by taking rock salt as the raw material, which comprises the following steps that: the mixture of sodium sulfate and sodium chloride, i.e. rock salt and sulfuric acid react to produce the hydrogen chloride and sodium hydrogen sulfate crystals; first, under a stirring condition, according to a certain stoichiometric ratio, sulfuric acid and rock salt are intermittently added into a glass lining reaction vessel to react while the temperature is insulated; and then sodium bisulfate solution which contains sulfuric acid is introduced to a crystal tower which contains an appropriate amount of water from the bottom of the reaction vessel to be cooled, crystallized and vacuum filter step by step, and then is washed by saturated sodium bisulfate solution to prepare sodium bisulfate crystals; and finally, the high-concentration sulfuric acid is added into the filtrate to be mixed to be sulfuric acid with the initial reaction concentration, and recycled. The method of the invention not only makes full use of natural resources, but also improves the added value of the rock salt, does not discharge any waste liquid, and meets the requirements of sustainable development.

The invention provides a method for post-processing the reaction product of mesotrione, comprising the following steps: (A) acidifying the reaction product of mesotrione, separating to obtain the first organic phase, and crystallizing to obtain the purified product of mesotrione and the mother liquor (B) After adding alkaline solution to the mother liquor for extraction, separate the water phase, acidify the water phase, separate to obtain a second organic phase, and crystallize the second organic phase to obtain a purified product of mesotrione. The post-treatment method of the present invention has high product yield, less three wastes, energy saving and environmental protection, and is suitable for continuous large-scale production.

The invention discloses a preparation method and application of a fast ion conductor-coated lithium-ion battery positive electrode material; the method is to mix nano-scale aluminum powder and positive electrode material by ball milling, and then stir and react with a lithium-containing solution to obtain aluminum hydroxide colloidal coating Coated positive electrode material precursor; the aluminum hydroxide colloid coated positive electrode material precursor is calcined at a high temperature to obtain a lithium ion battery positive electrode material coated with a dense, uniform and stable fast ion conductor, which can be used for A lithium-ion battery positive electrode with high rate performance and high cycle performance is prepared, and the preparation method has the characteristics of low cost, simple operation, and environmental friendliness, and can be applied to industrial production on a large scale.

The invention discloses a preparation method and application of a metal doped spinel structured and fast ionic conductor coated nickel-containing cathode material. The preparation method comprises the following steps of: dissolving and mixing organic titanium salt, a nickel-containing cathode material and doped metal salt so as to obtain dispersion liquid; transferring the dispersion liquid into a hydrothermal reaction kettle to perform hydrothermal reaction, such that a precursor is obtained; and roasting the precursor at high temperature so as to obtain the nickel-containing cathode material of a metal doped spinel structured and fast ionic conductor coated layer, which is dense, uniform and good in stability and ionic conductivity. The nickel-containing cathode material can be used for preparing a lithium ion battery having excellent cycle performance and rate capability; and the preparation method of the cathode material has the characteristics of being low in cost, simple to operate, environment-friendly and the like, and can be applied to industrial production.

The invention discloses a hydrophobic SiO 2 Coated halogen-free intumescent flame retardant and its preparation method and application. The preparation method comprises: (1) obtaining a halogen-free intumescent flame retardant with a positive charge on the surface; (2) obtaining a nano-SiO with a negative charge on the surface 2 Collagen solution; (3) to obtain SiO 2 Coated halogen-free intumescent flame retardant; (4) obtain hydrophobic SiO 2 Encapsulated halogen-free intumescent flame retardant. The invention provides a simple preparation method of a hydrophobic halogen-free intumescent flame retardant, which can be carried out step by step, has strong operability, is beneficial to industrial production, and can effectively avoid the reaction of the halogen-free intumescent flame retardant in water-containing Existing in the system for a long time causes the problem of flame retardant dissolution loss.

The invention discloses a crystal modifier for improving the physical properties of chemical drug raw material powders and a preparation method thereof. The crystal modifier is a drug-containing granule in which a modifier is filled, bonded, and coalesced between the chemical drug raw material crystals , and its preparation method is: (1) crushing and sieving chemical drug raw material crystals; (2) mixing modifier solution and chemical drug raw material crystals, and making the modifier fill, bond and coalesce between the chemical drug raw material crystals to form drug-containing granules; (3) drying and sieving the drug-containing granules. The invention can further expand the direct compression technology in practical application, and can improve the stability of medicine.

The invention discloses a preparation method and application of a metal oxide coated cathode material for a lithium ion battery. After ball milling and mixing are carried out on nanoscale metal powder and a cathode material, water is added to the obtained mixture for reaction, thereby obtaining the cathode material of which surface is coated by metal hydroxide colloid; the cathode material of which surface is coated by the metal hydroxide colloid is calcined at a high temperature, thereby obtaining the cathode material of which surface forms a metal oxide coating layer. The metal oxide coating layer is compact and even and is good in stability. The prepared metal oxide coated cathode material for the lithium ion battery can be used for preparing the lithium ion battery which is high in cycling stability and long in cycling life. The preparation method of the metal oxide coated cathode material for the lithium ion battery is characterized in low cost, simple operation and environmental friendliness and can be applied to industrial production on a large scale.