38results about How to "Meet content requirements" patented technology

The invention discloses a kind of Lactobacillus casei ( Lactobacillus casei ) SITCC No.10009, deposit number CCTCC No.M2017364, has the ability to produce high diacetyl, which is used in the preparation of fermented milk or fermented milk beverages, especially when containing Lactobacillus casei ( Lactobacillus casei ) The content of diacetyl in the fermented milk of SITCC No.10009 is 56.84 mg / L, especially the addition of sodium citrate in the preparation process makes the yield of diacetyl in the final fermented milk as high as 70.43 mg / L, and when combined with When the conventional starter is compounded, the types of volatile flavor compounds in fermented milk can be significantly increased, and the number of volatile flavor compounds reaches 56, thereby improving the aroma quality of fermented milk and promoting the improvement of the quality of fermented milk. In the field of fermented milk products Has broad prospects.

The invention relates to a method for preparing a high-titanium-iron alloy through an electro-aluminothermic process. The method comprises the following steps: uniformly mixing titanium-iron-containing minerals with titanium dioxide, a slag forming constituent and metal aluminium particles which are taken as a reducing agent; and heating and preserving heat in an electric furnace to perform melting and reducing reaction, separating slag after reaction is ended, thereby obtaining the high-titanium-iron alloy (Ti content being higher than or equal to 65wt%). The high-titanium-iron alloy preparedby taking titanium-iron-containing minerals such as ilmenite and vanadium titano-magnetite as raw materials can be output as high-additional-value products or can be used as raw materials to enter follow-up production. Compared with an external furnace aluminothermic process, the method has the advantages that electric heating production cost is lower, heating agents such as potassium chlorate donot need to use, smoke gas treatment cost is reduced, generation of aluminium oxide is reduced, consumption and waste residue amount of metal aluminium can be reduced, and the slag components are relatively simple and are beneficial for being further utilized as refractory materials and the like.

The invention discloses a device and a method for biologically treating cadmium in wastewater, and belongs to the technical field of water treatment. The method comprises the following steps: (1) constructing and starting a sulfate reducing biofilter; (2) constructing and starting an iron and manganese removing biofilter; (3) feeding cadmium-containing wastewater into the sulfate reducing biofilter, reducing hexavalent sulfur in the SO4<2-> into S<2-> through sulfate reducing bacteria, combining cadmium with sulfion to form insoluble substances of cadmium sulphide, and blocking most cadmium; feeding the unblocked cadmium into the iron and manganese removing biofilter, and adsorbung and removing cadmium by utilizing the adsorptivity of ecological manganese dioxide and ferrous oxides which are newly generated in the filter; and (4) feeding the raw wastewater into two levels of biofilters to be filtered sequentially. Cadmium in the produced water is less than 0.005mg / L, so that the national cadmium discharge requirements of second and third-class water in Environmental Quality Standards for Surface Water (GB3838-2002) are satisfied.

The invention relates to a method for producing solar-grade polysilicon by combined technology of molten salt electrolysis and directional solidification. Silicon; (3) Vacuum distillation and directional solidification of high-purity silicon. The phosphorus content of the high-purity polysilicon obtained by the present invention is reduced to 0.08×10-6, the phosphorus content is less than 0.1×10-6, and the silicon purity reaches more than 99.99995%, which meets the content requirements of solar-grade silicon for impurities (less than 0.5×10-6 6).

A method for simultaneously preparing abietate and cymene by catalyzing turpentine comprises the steps of (1) adding turpentine liquid into a reactor, adding a catalyst and alcohol for reaction at a temperature of 240-280 DEG C for 1-4 hours; (2) filtering, allowing the filtrate to stand for layering, performing reduced pressure distillation of the lower-layer liquid for 1-2 hours to obtain molten abietate and disproportionate turpentine; (3) performing reduced pressure rectification of the disproportionate turpentine, collecting fractions at 100-102 DEG C to obtain cymene. The method of the invention makes full use of the characteristics of large specific surface area and molecular sieve matrix of FCC waste catalysts to prepare a solid acid heterogeneous phase catalyst, simultaneously prepares the two fine chemicals of abietate and cymene by turpentine catalytic reaction, is simple in production process, solves the problems that homogeneous catalysts are difficult to separate from products and are difficult to regenerate for recycle in traditional abietate industrial preparation, decreases the content of trace metal zinc in abietate, and improves the product quality.

The invention discloses a methyl nitrite regeneration method, and is used for solving the problems of low regeneration rate of methyl nitrite, poor operational stability of a system caused by improper side reaction control, increase of operating cost and the like. The methyl nitrite regeneration method comprises the following steps: forming recycled gas containing 5-20% of nitric oxide after synthesis of methyl nitrite and carbon monoxide carbonyl, and entering the recycled gas to a methyl nitrite regeneration reactor in two parts, wherein a small part of recycled gas enters the lower section of the regeneration reactor from the bottom, the rest part of recycled gas and supplementing oxygen gas enter the upper section of the regeneration reactor from the middle part together; spraying fresh methyl alcohol into the tower top of the regeneration reactor, discharging methyl nitrite-containing gas from the tower top, pressurizing tower bottoms led out from the tower by using a pump and entering the tower bottoms to the lower section of the regeneration reactor from the middle part of the regeneration reactor; arranging a reboiler on the tower of the regeneration reactor, filling the lower section of the regeneration reactor with a catalyst, and arranging stuffing and / or a tower plate on the upper section of the regeneration reactor. The methyl nitrite regeneration method is simple in process, low in equipment investment and operating cost and high in regeneration rate of methyl nitrite and can be used for effectively solving the side reaction problem.

The invention discloses a boron removal method and device through an activated slag agent, and belongs to the fields of semiconductor materials and metallurgy. The device is provided with a lobe pump, a furnace base, a medium-frequency induction coil, an insulating layer, a graphite crucible, a stirrer and a lifting device. The method comprises the steps that raw silicon is put into the graphite crucible from a feed port, the lobe pump is started to perform vacuumizing, a medium-frequency induction power supply is started to perform heating, and when the temperature is increased to 1500 DEG C, silicon blocks are completely molten; inert gas is charged into a furnace cavity to enable the temperature to be kept at 1550 DEG C-1650 DEG C, the slag agent is added, the stirrer is started, and first-time slagging is completed; the power of the medium-frequency induction power supply is increased to enable the temperature in the furnace cavity to reach 1700 DEG C-1800 DEG C, the feed port is opened, active components of the slag agent are put into the furnace cavity for the first time, vacuumizing is performed, the stirrer is started, the inert gas is introduced, and second-time slagging is completed; after slagging is completed, silicon liquid is poured into a receiving crucible, standing and cooling are performed, a silicon ingot is taken out, purified low-boron high-purity silicon is obtained, and then boron removal achieved through the activated slag agent is completed.