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

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 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 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 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.