33results about How to "Contain less impurity" patented technology

The invention discloses a separation method for 1,5-pentanediamine. The separation method comprises the following steps: (1) contacting a 1,5-pentanediamine solution with cationic resin and carrying out adsorption; and (2) eluting 1,5-pentanediamine adsorbed onto the resin. Compared with the prior art, the separation and recovery method for 1,5-pentanediamine in the invention increases the yield of 1,5-pentanediamine; a treated solution obtained after adsorption by resin is basically free of 1,5-pentanediamine residues and the resin does not adsorb tetrahydropyridine, thalli, proteins and other impurities, so separated 1,5-pentanediamine is high in purity and low in impurity content; and the treated solution obtained after resin adsorption does not contain any polar organic solvent, so thesolution is free of harm to environment and easy to treat, and environmental pollution and separation cost are reduced. Meanwhile, a 1,5-pentanediamine diacid solution obtained after elution with diacid can be directly used as a raw material for synthesis of high-performance polyamide.

The invention discloses a magnetic ore rescreening process for mixed iron ore. The process comprises the following process steps: performing primary ore grinding, performing primary grading, performing primary low intensity magnetic separation, performing primary strong magnetic separation, rescreening, performing high frequency screening and performing secondary ore grinding and selecting. According to the invention, partial qualified iron ore concentrate and partial tailings are thrown out preferentially under the condition that the dissociation degree of useful mineral monomers is insufficient after the primary ore grinding operation, the amount of materials subjected to secondary regrinding and reselecting is reduced, and the aim of reducing the ore dressing cost is achieved.

The present invention belongs to the field of catalyst preparing and organic compound synthesizing technology. The present invention provides one kind one Al-Mg catalyst for the embedded alkoxylation reaction between materials alkyl carboxylate and alkylene oxide, and the catalyst catalyzed one-step process of synthesizing diblocked alkoxyl carboxylate ether. The catalyst is inorganic metal compound and has simple preparing process and low cost. The catalyzing mechanism is double active point catalysis, and through double point embedding, all ester radical C-O bonds of the alkyl carboxylate are embedded into polyalkoxyl radical to obtain polyalkoxyl ester ether blocked with acyl and alkyl simultaneously and final product with high end blocking rate and high purity.

The invention discloses a combined comb-tooth-type cotton picker with a self-cleaning function, comprising a power-driven chain-harrow-type transmission device arranged on the upper frontal end of a rack and a cotton cleaning machine formed by a U-shaped sawtooth roller and a steel brush cotton roller; a cotton stalk pressing guide device is arranged on the rack at the front part of a picking platform; comb teeth which are mutually parallel are fixedly connected on a crossbeam evenly; the front ends of the comb teeth incline upwards; a power-driven pulling preventing roller is arranged at the rear lower part of the comb teeth; the chain-harrow-type transmission device which is matched with the comb teeth is arranged above the comb teeth; a cotton feeding roller is arranged on a discharge hole of the chain-harrow-type transmission device; the cotton cleaning device formed by the U-shaped sawtooth roller and the steel brush cotton roller is arranged below the cotton feeding roller; and a cotton collecting chamber is arranged at the rear part of the cleaning device. The cotton picker provided by the invention has no special requirements on the cotton planting mode in row space, and can be suitable for the planting mode of any row space; in the combined cotton picker, 'zero distance' transmission is implemented, thus the cotton picker has the advantages of novel and compact structure, simple and direct operational procedures, convenience in maintenance, low manufacture cost, long service life, low operational failure rate and low-impurity seed cotton and the like.

The invention relates to the technical field of salt chemistry, particularly relates to a method of continuous dissolution of salt lake bischofite to prepare a high-concentration magnesium chloride solution, to a production device for achieving a process of large-scale bischofite dissolution to prepare refined brine, and provides a industrial demonstration effect route for developing magnesium series oxides in the Qinghai salt lake in the future. The method includes steps of: unloading bischofite, conveying and loading the material by conveying belts, feeding, dissolving into brine, allowing crude brine to overflow, performing magnesium chloride fine grain separation, buffering the brine, thickening and depositing the brine, obtaining a first-step clear liquid, subjecting the first-step clear liquid to first-step filter pressing, obtaining a second-step clear liquid, subjecting the second-step clear liquid to second-step filter pressing, squeezing and filtering the bottom material of a thickening machine, conveying mud cake, subjecting the brine to accident handling, and conveying and storing the refined brine so as to obtain the brine with technical indexes meeting requirements of ammonia gas combined reactions. The concentration of Mg<2+> in the refined brine is 115+/-3 g/L. The refined brine is clear, transparent and free of solid suspension impurities.

The invention relates to the technical field of breeding devices and particularly discloses a giant salamander breeding pond. The giant salamander breeding pond comprises a breeding pond body, whereina separation net is arranged in the middle of the breeding pond and divides the breeding pond into a hatching zone and a growth zone, a hatching bucket is arranged in the hatching zone, the bottom ofthe hatching bucket is hinged to a mounting base, a water draining pipe horizontally penetrates through the bottom wall of the hatching bucket, and air bags are uniformly distributed in the hatchingbucket. The giant salamander breeding pond also comprises a stirring bucket, wherein a piston is slidingly connected in the stirring bucket, a through hole is vertically formed in the piston, a pistonrod is connected to the top of the piston, the piston rod is in threaded connection with the top of the stirring bucket, and the end, extending out of the stirring bucket, of the piston rod is connected with a transmission mechanism. The bottom of the piston is connected with a flexible stirring belt. An air inlet one-way valve and a water outlet one-way valve are arranged on the side wall of thestirring bucket, an air outlet one-way valve and a water intlet one-way valve are arranged at the top of the stirring bucket, the water outlet one-way valve is communicated with the water draining pipe, and the water inlet one-way valve is communicated with the breeding pond. By adopting the giant salamander breeding pond, no direct impact is produced on fertilized ovum of giant salamanders, andthe oxygen content demand in water can be met.

The invention relates to a fluorite beneficiation process. The beneficiation process is characterized by comprising the following steps of 1) calcium removal beneficiation of fluorite; 2) preparation of a fluorite floatation agent, wherein an intermediate produce crude fatty acid or mixed fatty acid produced by oleic acid is employed as a raw material, concentrated sulfuric acid in an amount which is 50 to 20 percent based on the weight of the fatty acid is added into the fatty acid to sulfate the fatty acid, and a beneficiation foaming agent in an amount which is 0.4 to 3 percent based on the weight of the fatty acid is added into a reaction product to obtain a product; 3) preparation of a composition of a fluorite floatation regulator, wherein any one of sulfuric acid, hydrochloric acid, nitric acid and acetic acid and corresponding salt are compounded with sodium silicate salt according to a proportion of the acid, the salt corresponding to the acid and the sodium silicate salt of (1-2.5):(1-5):(0.5-3); 4) fluorite floatation, a mixture consisting of acid, alkali and a synergist is employed as a regulator, oleic acid or rubber sodium oleate is employed as a collecting agent, and a process flow is a compound loop for fluorite floatation.

The invention relates to the cotton processing technical field, in particular to a cotton seed, commodity linter and grease raw material co-production process based on the delinting technology of a cylindrical brushing machine. The co-production process is characterized by producing cotton seeds, commodity linters and grease raw materials at the same time by primary processing of materials (fluff). Compared with the prior art, the co-production process has the advantages of simple process flow, short processing route, high production efficiency, low cottonseed crushing ratio, guaranteed seed quality, fewer linter impurities, easy linter cleaning, high commodity linter level, complete waste (photon) skin, convenient hulling, thorough separation between cotton hulls and cotton kernels and high oil yield. In the process, the linter obtained by double brushing is collected, cleaned and packaged respectively, thus ensuring grade quality of the commodity linter.

The invention relates to an air suction and air blow-combined separation type grain cleaning device for a reaping machine. The device comprises a sieve which is arranged on a machine frame and is driven by a driving mechanism to swing back and forth, wherein the sieve consists of a single-layered sieve body and a grain warehouse attached to the sieve; the single-layered sieve body comprises a sieve bottom board and a square frame baffle; the front section of the square frame baffle is provided with the sieve bottom board, and the rear section of the square frame baffle is provided with a warehouse inlet; a draft fan and an air collection hood are arranged above the sieve; and one end of the sieve is provided with an air blower. The device can separate grains and weeds efficiently, the separated grains contain a small number of impurities, and the device has the advantages of simple structure, small volume, low power consumption and the like.

The invention relates to the technical field of calcium hydrogen phosphate preparation, and discloses a preparation method of high-purity calcium hydrogen phosphate. An acid-alkali neutralization method is adopted, a phosphoric acid solution with a mass part of 30%-40% is used, calcium oxide powder is placed in an ultrasound vibrator for ultrasonic agitation after a certain amount of water is added, time is 5-15 minutes, frequencies are 30-50 kHz, and a calcium hydroxide suspension is made. The phosphoric acid solution and the calcium hydroxide suspension are put into a reaction still for reactions at temperatures of 65-75 DEG C, ph is controlled at about 5.5-6, reaction time is 30-50 minutes, and continuous stirring is conducted to generate a calcium hydrogen phosphate solution, and the calcium hydrogen phosphate is obtained after drying and evaporation; the calcium hydrogen phosphate has the advantages of capable of saving resources, being recyclable, and containing less impurities.

The invention discloses a preparation method of caramel pigment. By optimizing the preparation process of the caramel pigment, the content of 4-methylimidazole can be effectively reduced; in addition,in the coking reaction process, by adding saccharose ester, viscosity during sugar discharging is effectively reduced, color rate is not influenced, and the application range of products is improved;meanwhile, the invention further discloses a production device for preparing the caramel pigment, the production device comprises a kettle body, a spiral stirring piece, a material discharge valve, amobile layer, a fixed layer and the like, by adopting the production device, reaction materials can be uniformly heated, less foam is produced during coking, and product quality is uniform; double-layer design is adopted for the material discharge valve in the production device, the fixed layer and the mobile layer are provided with one-to-one corresponding through holes, the mobile layer can berotated to enable the one-to-one corresponding through holes to be staggered, the closure of the material discharge valve is realized, the one-to-one corresponding through holes are communicated by rotating the mobile layer, the opening of the material discharge valve is realized, the coked large-particle defective products can be effectively filtered, the quality of products is guaranteed, meanwhile, waste products are convenient to recycle, waste is reduced, and the production cost is saved.

The invention relates to a high-efficiency cotton picker head, a plurality of supporting frames are arranged around one end of a hard pipe material, a cotton picking claw assembly is arranged on each supporting frame, a sliding slot is arranged at the axial position of each cotton picking claw corresponding to the hard pipe material, a slide block is placed in each sliding slot, the slide blocks are connected to the mouth of a hard pipe through springs, external power is transmitted to the mutually linked cotton picking claw assemblies through a gear box, the cotton picking claw assemblies simultaneously and relatively rotate at the mouth of the hard pipe material to pick cotton approaching the cotton picking claw assemblies, and the picked cotton is output from the other end of the hard pipe material.

The invention discloses a two-stage cyclone filtering device which adopts a two-stage cyclone design of a cyclone and a cyclone plate, natural gas mixed with coarse and fine sand grains with differentsizes is subjected to cyclone filtering through a first cyclone hole in the cyclone and a second cyclone hole in the cyclone plate respectively, and coarse sand is subjected to cyclone centrifugal filtering through the lower part of a cylinder body; fine sand is subjected to cyclone centrifugal filtration at the upper part of the cylinder body, sand grains in natural gas are subjected to optimized centrifugal filtration by designing the arrangement mode of the first cyclone hole and the second cyclone hole, then the sand grains are filtered by the aid of a filter cylinder, and finally, the natural gas discharged from a gas outlet is low in impurity content; overall, the functions of good sand discharging effect, good sealing performance, convenient disassembly and assembly, online sand discharging and the like can be achieved.

The invention discloses a sorting machine for sorting hard materials and a sorting method thereof. The sorting machine comprises a rack, a feeding mechanism, a charging mechanism, a sorting mechanism and a material receiving mechanism, wherein feeding mechanism vibrates, so that materials can rapidly fall off to the sorting mechanism in a controllable mode; mixed materials display the properties of light transmitting and light tightness or light reflection and no light reflection through light sources; a sensor and a lens can recognize materials which are not required to be sorted and materials required to be sorted, and then a valve terminal spray nozzle is used for separating the materials which are not required to be sorted and the materials required to be sorted; the separated materials are classified and gathered by the material receiving mechanism. According to the invention, efficient, rapid and high-yield effects can be achieved, so that the impurity content of the hard materials can be reduced greatly, and the benefits and processing efficiency are improved; under the condition that the hard material requirement is increased day by day, high-quality hard materials can be provided efficiently and rapidly.

The invention relates to a high-temperature co-carbonization agent and application thereof to recarburizing and impurity fixing in the carbonization process of plastic waste. The application of the high-temperature co-carbonization agent to recarburizing and impurity fixing in the carbonization process of the plastic waste comprises the steps that polyurethane waste is pretreated; the pretreated polyurethane powder is mixed with the co-carbonization agent, and carbonization is carried out under the protection of inert gas to form a carbonization material; and the carbonization material is mixed with an activating agent, high-temperature activation is carried out under the protection of the inert gas, the activating agent is removed, and drying is carried out to obtain an activated carbon product. According to the high-temperature co-carbonization agent and the application thereof tp recarburizing and impurity fixing in the carbonization process of the plastic waste, a synergistic effect existing between waste polyurethane plastics and the co-carbonization agent is used for improving the carbonization process yield, the activated carbon is prepared through high yield, the gas yieldand impurity-contained micromolecules in the preparation process are reduced, waste is turned into wealth, and good industrial application potentiality can be achieved.