58results about How to "Eliminate the extraction process" patented technology

The invention provides a method for manufacturing Sm-Fe-N permanent magnetic alloy powder by adopting a reduction diffusion method. The process flow is: selection of raw materials and pretreatment→ratio of reactants→mixing of reactants→metal thermal reduction and diffusion alloying→chemical separation of reaction products→dehydration and drying of metal powder→powder nitriding treatment→manufacture of anisotropic bonding Sm-Fe-N magnet; it is characterized in that: use rare earth chloride and selectively control the particle size of alloy element iron powder, and the reducing agent is metal Ca and CaH 2 , carry out reduction diffusion reaction in the lower temperature range of 760-860 ℃ to generate Sm-Fe alloy and by-products, and after chemical separation, Sm-Fe alloy is pulverized and nitrided to directly obtain Sm-Fe with required composition and particle size requirements -N magnetic alloy powder. The advantages are: low reaction temperature, small loss of Sm, easy control of composition, simplified process and good performance.

Production of high-purity 1,1,1-triflu-2,2dichloroethane. It is carried out by fluoridizing, thermal fluoridizing triclene, obtaining the mixed gas containing fluothane, trifluo-dichloroethane and trifluo-trichlorineethane, catalytic chlorinating reacting the mixed gas under 160-250deg.C by coir active carbon, alkali washing the reacted gas by water, fractional distilling and condensing, and obtaining the purified product. It advantages include simple process, to improve energy utilizing rate, lower process load, and realize clean production.

The invention discloses a river and lake bottom sludge pollutant flux test method and a river and a device based on a diffusion theory. The method comprises the following steps of: A, acquiring a bottom sludge sample; B, putting the bottom sludge into a base of an experimental device, and enabling the sludge surface to be horizontal; C, slowly injecting water to a column port along a column wall; D, injecting running water into the experimental device without the bottom sludge; E, standing for a certain time; F, measuring the pollutant concentration of the taken water sample; G, calculating a degrading coefficient of the pollutant in the water; H, calculating an initial concentration value of the bottom sludge water; and I, calculating a pollutant exchange flux of a water-sludge interface. A base plate is fixed at the bottom of a constant-temperature water tank; a base wall is arranged on the base plate; a lower flange disk is arranged on the upper part of the base wall; an upper flange disk is arranged at one end of a column body; and an upper flange disk fixing bolt flange hole is formed in the upper flange disk. The method is feasible, and is convenient to operate; the experimental device has a rational and simple structure; operations of accommodating deposits, sampling water samples and the like are extremely convenient; and outstanding economic benefit is achieved.

The invention discloses a process for producing caramel pigment, comprising the following procedures of a) gelatinization procedure, b) liquefaction and saccharification procedure, c) hydrolysis procedure and d) ammonification procedure, wherein the b) liquefaction and saccharification procedure comprises the following steps: adding alpha-amylase and saccharifying enzyme to the gelatinized purplesweet potato with the pH of 4.5-6.0 and the temperature of 70-95 DEG C, and reacting for 30-60min, wherein the weight proportion of the purple sweet potato, the alpha-amylase and saccharifying enzymeis 1:0.01-0.04:0.01-0.04. Compared with the prior art, in the invention, the purple sweet potato is taken as the raw material, therefore the extraction procedure of starch is saved and the process flow is simplified; furthermore, the purple sweet potato contains natural pigment and has good acid resistance, salt resistance and good stability; the caramel pigment produced by taking the sweet potato as the raw material has high color ratio and good stability, generates no pollutants during the hydrolysis process, shortens the production period and saves the cost; and the caramel pigment prepared by utilizing the sugar solution through a high-pressure ammonia method has good color ratio and good product quality.

The invention relates to a method for controlling microcracks on the surface of asphalt-based spherical activated carbon. By modifying coal tar pitch with a high softening point, improving the pelleting conditions of naphthalene-containing pitch particles, and changing the removal method of naphthalene in the naphthalene-containing pitch pellets, the final A pitch-based spherical activated carbon with smooth surface, no microcracks and high sphericity was obtained. Among them, the prepared pitch-based spherical activated carbon has a density of 0.5-0.85g / cm 3 , The specific surface area is 800~1300m 2 / g, vibration strength higher than 95% and microporous content higher than 83%. The invention effectively solves the problem of microcracks on the surface of the pitch-based spherical activated carbon during the preparation process, not only improves the mechanical properties of the material, but also has great significance for promoting the engineering process of the material and expanding its application field.

The invention belongs to the field of preparation of copper-based composite materials for welding electrodes, and discloses an ultrafine zirconium carbide particle-zirconium boride rod crystal reinforced copper-based electrode material and a preparation method thereof: uniformly mixed Cu-Zr-B 4 C mixed powder was put into a high-temperature tubular atmosphere furnace and heated to 1250 °C to obtain Cu-containing ultrafine ZrC particles and ZrB 2 Rod crystal composite powder, followed by smelting oxygen-free copper and Cu-containing ultrafine ZrC‑ZrB in a vacuum melting furnace 2 Mixture of composite powders and applying magnetic stirring to prepare ultrafine ZrC particles‑ZrB 2 Rod grain reinforced copper-based electrode material. The method of the invention has the characteristics of low cost, simple process, high production efficiency, small reinforcement body, uniform distribution and the like.

The invention provides a sampler for brominated flame retardants in indoor air and a sampling and measuring method thereof, and relates to the technical field of analysis and detection. The sampler provided by the present invention includes: several solid-phase extraction columns in parallel, all filled with fillers in the solid-phase extraction columns, and the fillers include the upper CNWBOND HC-C18 filler and the lower CNWBOND NH 2 Packing, the packing is separated by glass fiber sieve plates; a flow meter connected to the parallel outlet of the solid phase extraction column; a diaphragm vacuum pump connected to the outlet of the flow meter. The sampler of the present invention uses a solid phase extraction column to directly enrich traditional and new brominated flame retardants in the air, and the eluent can be directly concentrated by nitrogen blowing and then injected for detection, meeting the sampling requirements of different types of indoor environments At the same time, the solvent extraction and purification steps in the traditional sampling method are omitted, the solvent consumption is significantly reduced, the sampling process is simplified, and the interference of uncertain factors on the sampling and measurement results is reduced.