238results about How to "Fast dissolution rate" patented technology

The invention relates to a complex heavy-metal waste water emergency quick treatment method, comprising the following steps of: filtering by a sand filter; mixing by a high-speed pump; carrying out an ultraviolet catalyzing ozone reaction; carrying a microwave catalyzing active carbon reaction; carrying micro-electrolytic reaction; circulating waste water; carrying out a Fenton reaction; carryingout electric flocculation on an aluminum electrode plate; and pressing and filtering sludge. Waster water in a circulating slot is pumped into an iron carbon fluidized bed by a fluidizing pump to be circularly treated; an air compressor is connected with the iron carbon fluidized bed and prevents a filler in the iron carbon fluidized bed from blocking; and the microwave active carbon reactor is an active carbon filling tower, and a microwave emitter is arranged outside the body of the active carbon filling tower. The complex heavy-metal waste water emergency quick treatment method disclosed by the invention is used for treating the complex heavy-metal waste water, associated devices are simple, easy, quick, can meet an emergency, and can update and convert, no various chemical raw materials are fed, and various complex heavy-metal waste water with unknown elements can be quickly treated as long as the current magnitude is regulated, and thus the heavy metal in the waste water and chemical oxygen demand can immediately reach the standard and are discharged.

The invention discloses a canagliflozin of crystal form B, and a crystallization preparation method thereof. The X-ray powder diffraction pattern of the canagliflozin of crystal form B has characteristic peaks at diffraction angles 2theta with the values of 3.4+ / -0.1, 6.6+ / -0.1, 12.6+ / -0.1, 13.2+ / -0.1, 15.3+ / -0.1, 15.6+ / -0.1, 16.5+ / -0.1, 19.4+ / -0.1, 19.8+ / -0.1 and 23.7+ / -0.1. The method has the advantages of high efficiency, easy operation and short time. Canagliflozin crystals of crystal form B prepared in the invention have a large solubility and a fast dissolving rate, the above product has a purity of above 99%, and has a yield of about 95%, and the purity, the color and the form of the product are unchanged after the product is stored under normal temperature dry conditions for 100d. The product has the advantages of easy crushing, easy addition of medicinal compositions, low cost, and easy commercial industrial large-scale enforcement.

The invention relates to a double-sided photo-thermal conversion material and a solar seawater evaporation device constructed by the same. The double-sided photo-thermal conversion material has a composite layer (more than two layers) structure, and the upper and lower layers are hydrophilic photo-thermal conversion materials. The device is composed of the double-sided photo-thermal conversion material (with a three-layer composite structure, the lower layer is completely immersed in seawater, and the upper layer is located above the water surface), a water tank (containing seawater), a waterlevel adjusting mechanism (capable of adjusting the height of the water surface) and a turnover mechanism (capable of intermittently driving the double-sided material to turn over up and down). Alternatively, the device is composed of a conveyor belt (which is a hydrophilic photo-thermal conversion material with a double-layer composite structure and is distributed into three parts, namely, a partbelow the water surface, a part above the water surface and a part outside the water tank), a water tank, a water level adjusting mechanism, a supporting mechanism (capable of supporting the conveyorbelt) and a driving mechanism (capable of continuously driving the conveyor belt to work). The problems that in the prior art, salt particles separated out of the surface of a hot layer are not removed in time, consumed time is long, and cost is high are effectively solved.

The invention discloses aspirin pulsed release pellets, its preparation and a preparation method thereof. The pellets comprise blank pellets, an aspirin-containing drug layer, an isolation layer, a regulation releasing layer and a protective layer. The regulation releasing layer contains polyprotic acid and / or its salt, anionic polymer salt, a plasticizer and an antiadherent. The anionic polymer salt is prepared by the following method: dissolving an enteric material, and using alkali to neutralize to a pH value greater than the enteric material dissolution pH value 0.1-3. The protective layer contains the enteric material, the plasticizer and the antiadherent. The enteric material is any one material selected from: an enteric material dissolved at pH value of 4.5-5.5 to prepare pellets I; an enteric material dissolved at pH value of 6.0-6.5 to prepare pellets II; or an enteric material dissolved at pH value of 7.0-8.0 to prepare pellets III. According to the preparation, local drug concentration will not be high, accumulation of the drug inside the body can be reduced, patient compliance can be improved, and stability inside the body can be raised. Therefore, bioavailability and the antithrombotic effect are raised.

The invention relates to a maca teabag and a preparation method thereof. The maca teabag is prepared from the raw materials of 10-15 parts of maca, 5-8 parts of raspberries, 3-6 parts of barley, 2-4 parts of osmanthus fragrans and 1-3 part(s) of Pu-Er ripe tea through the steps of raw material selecting, smashing, screening with a vibrating screen, weighting, component mixing and final subpackage. The maca teabag is reasonable in components and ratio design, and rich in nutrition, and the effects of all components are supplementary to one another; the preparation method is simple and convenient, and the cost is low; the maca teabag is prepared from natural components completely, so that original taste and flavour are kept, the tea soup of the maca teabag is brownish yellow, strong in wheat flavor and flower fragrance, and mellow in taste; the dissolution rate is high, extract is multiple, brewing resistance is achieved, maca teabag is carried and drunk conveniently by people, and a new beverage with the efficacities of tonifying kidney, building body and resisting fatigue is provided.

The invention relates to an Entecavir tablet. The Entecavir tablet contains 0.2-1% of Entecavir monohydrate, 85-98% of filler, 0-5% of binder, 0-10% of disintegrating agent, 0-2% of flow aid and 0.5-2% of lubricating agent by weight, wherein the Entecavir monohydrate is added in the form of powder. The invention also relates to a preparation method of the Entecavir tablet.

The invention discloses sewage treatment equipment, and relates to the technical field of sewage treatment. The sewage treatment equipment includes a cylinder. The side wall of the cylinder is provided with a water inlet, a water outlet and a feed inlet. A motor is fixedly mounted on the cylinder. The inside of the cylinder is also provided with a stirring assembly, an aeration assembly and a feeding assembly. The stirring assembly in the invention stirs sewage in different directions. Moreover, the aeration assembly can rotate according to the rotation of a rotating plate, which increases an aeration range. The feeding assembly realizes intermittent switch of the feed inlet through the rotation of the rotating plate, and so a material can be placed in the cylinder at equal time intervals. The aeration assembly and the stirring assembly cooperate to make the contact between the sewage and air fuller and make the mixing more uniform. The feeding assembly and the stirring assembly cooperate to make the contact between the material and the sewage fuller, and so the dissolution rate of the material is fast, which improves the treatment effect of the sewage. Moreover, the aeration assembly and the feeding assembly in the device does not need to be additionally provided with a driving device, which reduces the cost.

The invention relates to an open-celled polypropylene microcellular foaming sheet. The open-celled polypropylene microcellular foaming sheet comprises the following components: 100 parts by weight of polypropylene resin and 50-100 parts by weight of polyethylene resin. A production method of the open-celled polypropylene microcellular foaming sheet comprises the following steps: plastifying, mixing, sizing, cutting and forming a bicontinuous phase polypropylene / polyethylene blend foaming base material by virtue of a double-screw extruder, and then carrying out supercritical carbon dioxide solid foaming. The open-celled polypropylene microcellular foaming sheet has the advantages that the bicontinuous phase polypropylene / polyethylene blend base material is formed, and then the base material is foamed at a polypropylene foaming temperature by adopting a solid foaming technology, cells formed in a polyethylene phase in a complete molten state are completely cut-through and penetrate through cell walls of the cells formed in a polypropylene phase, and the open-celled polypropylene microcellular foaming sheet is formed; meanwhile, the obtained open-celled polypropylene microcellular foaming sheet is small in cell size, high foaming ratio and high porosity and can be widely applied to the fields of filtering, sound absorption, ventilation and the like.

The invention relates to the technical field of a tea product and particularly relates to wax gourd and lotus leaf tea bag and a production method thereof. The wax gourd and lotus leaf tea bag is characterized by being prepared from the following raw materials by weight parts: 8-12 parts of Tieguanyin tea leaves, 3-8 parts of barleys, 2-6 parts of lotus leaves and1-5 parts of cassia seeds. The preparation method comprises the following steps of: screening the raw materials; crushing the raw materials; sieving the crushed materials by a vibration sieve and uniformly mixing components of the raw materials; packaging the treated by using a tea filtering paper bag; and sterilizing the paper bag with the treated materials. The effects of the four raw materials including wax gourd peels, the lotus leaves, oolong and roses supplement with one another and the raw materials are enriched with various vitamins, so that the a wax gourd and lotus leaf tea bag has certain effects of inducing diuresis to reduce edema, and slimming and beautifying. According to the wax gourd and lotus leaf tea bag and the production method thereof disclosed by the invention, the design is reasonable and the operation is simple and convenient; the tea is composed of all natural ingredients; and the tea is yellowish green and clear, fragrant and pure in mouth feel. Meanwhile, the dissolution rate is high and multiple extracts exist, so that the wax gourd and lotus leaf tea bag is convenient to carry and drink by people.

The present invention relates to an olanzapine oral disintegration tablet and a preparation method thereof. The olanzapine oral disintegration tablet comprises: olanzapine, mannitol, and calcium hydrogen phosphate. The olanzapine oral disintegration tablet uses the olanzapine as the raw material, comprises one or more pharmaceutically acceptable excipients and is prepared by a direct compression. The olanzapine oral disintegration tablet can be quickly disintegrated in vitro, and quickly and uniformly disintegrated and dispersed, and is slightly sweet and tastes good. The olanzapine oral disintegration tablet is conveniently taken, and is especially suitable for the patients with emergency in dysphagia or special environment such as the elderly, children, and coma patient. The olanzapine oral disintegration tablet has the advantages of simple preparation process and low cost, and is suitable for industrialized production.

The invention relates to the field of medicament preparation, in particular to a lansoprazole enteric preparation and a preparation method thereof. A lansoprazole enteric pellet is provided with an empty pellet core, a medicament layer, an isolation layer and an enteric coating layer in turn from the interior to the exterior, wherein the medicament layer contains lansoprazole, disintegrating agent, compatibilizer and basic stabilizing agent; and the lansoprazole enteric preparation is characterized in that the medicament layer also comprises micronized crosslinked povidone. The lansoprazole enteric preparation and the preparation method thereof have the advantages of higher dissolution rate of enteric pellets, reducing consumption and variety of compatibilizer, saving the preparation cost, reducing the technical difficulty and contributing to human safety.

The invention relates to a novel crystal form of cefazolin sodium and a crystallization preparation method thereof. An X-ray powder diffraction pattern is used for defining at the characteristic peaks of a diffraction angle of 2-theta degrees and DSC. The preparation method comprises the following steps: adding a cefazolin sodium solid into a solvent to prepare a suspension of 0.3-0.7g / mL; heating the suspension to 30-45 DEG C under a stirring condition; stirring for 0.5-12 hours at a constant temperature; cooling to 0-20 DEG C, and growing a crystal at a constant temperature for 0.5-2 hours; then filtering to obtain crystal slurry; and drying the filter cake obtained by filtering to obtain a product of the novel crystal form of cefazolin sodium. The novel crystal form has a higher heat-absorption temperature, the product purity, color and shape do not change after the product is stored for 100 days under a normal-temperature and dry condition, and the crystal form has relatively good stability. Compared with already reported crystal forms, the short-bar shaped novel crystal form has the advantages of relatively high dissolving speed and relatively high fluidity and bulk density, and is easy for commercially industrial large-scale implementation.

The invention belongs to the technical field of medicines and particularly relates to a ropivacaine mesylate compound. The structural formula of the ropivacaine mesylate compound is shown in the description, and an X-ray powder diffraction spectrogram obtained by measuring the ropivacaine mesylate compound with Cu-K alpha rays is shown in figure 1. The invention also provides a preparation process of the ropivacaine mesylate compound, a pharmaceutical composition containing the ropivacaine mesylate compound and a preparation process of the pharmaceutical composition. Dosage forms of the ropivacaine mesylate pharmaceutical composition are powder injections, small volume injections and large volume injections. The ropivacaine mesylate compound is high in solubility and high in dissolution rate, and the pharmaceutical composition of the ropivacaine mesylate compound is good in dissolubility, easy to dissolve and composite and high in bioavailability.

The invention relates to the field of oil exploitation, and discloses a carboxyl-modified graphene graft polymer as well as a preparation method and application thereof. The method comprises the following steps: (1) dissolving acrylamide, benzenesulfonic acid and N-vinyl pyrrolidone in water, adding carboxyl-modified graphene, adding a first emulsifier to prepare an aqueous phase system, and dissolving a second emulsifier in an oil phase to prepare an oil phase system; (2) preparing an inverse emulsion system from the aqueous phase system and the oil phase system; (3) carrying out a first polymerization reaction on the inverse emulsion system to obtain an intermediate product system, and carrying out a second polymerization reaction on the intermediate product system to obtain a pre-product; (4) purifying, drying and crushing the pre-product to obtain the carboxyl-modified graphene graft polymer, wherein the content of the oxygen element in an XPS test result of the carboxyl-modified graphene is not lower than 26 wt%. The polymer provided by the invention is used as a drilling fluid filtrate reducer and has excellent temperature resistance and salt resistance.

The invention provides an antineoplastic compound deacetylase fungus epoxy ethyl ester injection and a preparation method thereof, belonging to a compound. The antineoplastic compound deacetylase fungus epoxy ethyl ester injection can solve the slightly solubility problem of deacetylase fungus epoxy ethyl ester, can increase the oral bioavailability of deacetylase fungus epoxy ethyl ester and hasgood stability. The antineoplastic compound deacetylase fungus epoxy ethyl ester injection is nano suspension freeze-dried powder and comprises deacetylase fungus epoxy ethyl ester, a surface active agent, a suspending agent and a freeze-drying protecting agent in the mass ratio of 1:(0.5-10):(0-10):(2-10). The preparation method comprises the following steps of: putting deacetylase fungus epoxy ethyl ester, the surface active agent and the suspending agent in a container, adding water, predispersing, homogenizing, adding the freeze-drying protecting agent, dissolving by stirring, subpackaging, freezing, and freeze-drying to obtain the antineoplastic compound deacetylase fungus epoxy ethyl ester injection.

The invention relates to a method for preparing copper oxide by dissolving copper, which comprises the following steps that: copper, ammonia water and powdery ammonium bicarbonate or ammonium carbonate or the mixture of the ammonium bicarbonate and the ammonium carbonate are placed into a reaction container, the temperature of a system is controlled between 30 DEG C and 55 DEG C, the pressure intensity of the system is between 1atm and 2atm, and air or oxygen gas is introduced when the operation of stirring is continuously carried out for reacting; meanwhile, a circulating device is arranged for conveying ammonia gas and carbon dioxide which are volatilized from the reaction container into the reaction container anew for participating in the reaction after the ammonia gas and the carbon dioxide are recycled; and when the temperature is increased and the pressure intensity of the system is not changed any longer, the reaction is finished, the undissolved copper in the reaction system is removed, the operation of filtering is carried out, a filter cake is remained, the operation of washing is carried out and the operation of sintering is carried out at the temperature of 500 to 700 DEG C so as to obtain copper oxide of which the purity is greater than or equal to 99 percent. According to the method disclosed by the invention, raw materials are easy to obtain, the price is low, the requirement to equipment is not high, no pollution to the environment exists, the dissolving rate of the copper is high, and the production cost of the copper oxide is greatly lowered.

The invention provides a codonopsis pilosula, poria cocos and white atractylodes rhizome tea bag which is prepared from the following substances in parts by mass: 15 to 30 parts of codonopsis pilosula, 15 to 30 parts of poria cocos, 15 to 25 parts of white atractylodes rhizome, 10 to 18 parts of hawthorns, 10 to 18 parts of semen cassia, 8 to 15 parts of white chrysanthemum flowers, 8 to 15 parts of momordica grosvenori, 8 to 15 parts of rose flowers, 6 to 12 parts of orange peels and 6 to 10 parts of tea leaves. The invention further provides a preparation method of the codonopsis pilosula, poria cocos and white atractylodes rhizome tea bag. The codonopsis pilosula, poria cocos and white atractylodes rhizome tea bag disclosed by the invention has the effects of tonifying qi, strengthening the spleen, promoting digestion to eliminate stagnation, relaxing bowel, reducing lipid and pressure, reducing fat, losing weight, reducing blood fat, preventing and treating thrombus and regulating the physiological function of a human body, further has the effects of protecting the health and nourishing the life, and is a safe and toxic and side effect-free natural blood fat and blood pressure reducing good product.

The invention relates to a rose lotus leaf tea bag and a preparation method of the rose lotus leaf tea bag. The rose lotus leaf tea bag is processed by 7-10 parts of rose, 8-12 parts of lotus leaf, 4-6 parts of green tea, 2-5 parts of chrysanthemum and 1-4 parts of semen cassiae. The preparation method of the rose lotus leaf tea bag comprises the following steps: crushing raw materials, namely crushing the rose, lotus leaf, green tea, chrysanthemum and semen cassiae in weight proportion into powder by virtue of a crushing machine at the temperature of 18-30 DEG C and the humidity of 30-70%; sieving, namely sieving the raw material powder crushed by virtue of a vibrating sieving machine; blending, namely stirring and blending the sieved raw material powder; packaging, namely packaging the blended raw material powder in bags; sterilizing. The rose lotus leaf tea bag is composed of all natural ingredients, tea soup is yellow green and clear, fragrance is fresh, and taste is pure; meanwhile, dissolution rate of the rose lotus leaf tea bag is high, extracts are more, content of amino acid and tea polyphenol nutrition and health care components is high, the rose lotus leaf tea bag is easy to carry and drink, and new beverage with the effects of losing weight, maintaining beauty and keeping young is provided for people.

The invention discloses a method for producing battery-grade nickel sulfate by taking nickel oxide as a raw material. The method is characterized by comprising the following steps: (1) pretreating nickel oxide by using sulfuric acid with a hydrogen ion concentration of 8-12 mol / L, carrying out solid-liquid separation, carrying out solid-liquid separation by using sulfuric acid with a hydrogen ionconcentration of 3-6 mol / L to obtain a solid, filtering the obtained solution to obtain a filtrate; and (2) neutralizing the filtrate obtained in the step (1) by using nickel carbonate, evaporating the obtained solution, and carrying out crystallization and drying to obtain the battery-grade nickel sulfate product. According to the method, the dissolution rate of nickel oxide is increased by aboutone time, purification and impurity removal are not needed, and a nickel sulfate product can be produced by directly carrying out evaporative crystallization. A crystallization mother liquid can be repeatedly used, resources are saved, the extraction process is short, and cost is low.

The invention belongs to the technical field of production of fluid ores of petroleum, natural gas, shale gas and the like, and particularly discloses a preparation technology of a self-suspension coated support material. The preparation technology comprises the following steps: (1) heating aggregate to the temperature of 80 to 230 DEG C, and stirring and mixing the heated aggregate; (2) cooling to the temperature of 75 to 200 DEG C, adding inner resin and a curing agent of the inner resin, and stirring, thus forming an inner coating layer; (3) cooling to the temperature of 65 to 190 DEG C, adding a drag reducer, and stirring; (4) cooling to the temperature of 55 to 130 DEG C, adding a catalyst, outer resin, an amine additive and a curing agent of the outer resin, and stirring, thus forming an outer coating layer; (5) cooling to the temperature of 40 to 80 DEG C, adding a blocking agent, and stirring; (6) cooling to the temperature of 30 to 70 DEG C, discharging out of a pot, and controlling the apparent density of a low-density support agent within the range of 1.05 to 2.60g / cm<3>. The self-suspension coated support material prepared by the preparation technology has the advantages that the flow guide property is good, the self-suspension property is good, and the friction drag is low.

The present invention discloses a non-hygroscopicity protocatechuic acid berberine monohydrate having a crystal form, and belongs to the technical field of drug crystallization. According to the present invention, berberine hydrochloride, protocatechuic acid and sodium hydroxide are dissolved in an ethanol aqueous solution according to a certain ratio to form the protocatechuic acid berberine monohydrate crystal; the preparation method has characteristics of simpleness, easy performing, low cost, and high crystal yield; and the prepared protocatechuic acid berberine monohydrate crystal does not have the hygroscopicity, has the moderate solubility in water, can be rapidly dissolved, and can be used in cardiovascular diseases and anti-cancer.

The invention relates to the technical field of tea products, and in particular relates to a beer belly tea bag and a preparation method thereof. The beer belly tea bag is characterized by being prepared from the following components in parts by mass: 8 to 12 parts of Tie Guanyin tea, 3 to 5 parts of barley, 2 to 4 parts of lotus leaf and 2 to 4 parts of cassia seed. The preparation method comprises the following steps of screening and crushing raw materials; sizing by virtue of a vibrating screen; mixing the components; and packaging by using a tea filter bag. The Tie Guanyin tea, the barley, the lotus leaf and the cassia seed are compatible, and can better play the effects of slimming and health care. The preparation method is reasonable in design, is easy and convenient to operate; and the tea bag consists of full natural components, and the tea soup is golden, rich in flavor and mellow in taste. Furthermore, the tea bag is high in dissolution speed, has more extract, and is convenient to carry and drink.

The invention discloses a fertilizer for the flowering and fruiting period of wolfberry, relates to the technical field of fertilizers for soil testing and formulated fertilization and particularly relates to a special water-soluble fertilizer for the flowering and fruiting period of wolfberry. The water-soluble fertilizer contains more than or equal to 50wt% of effective elements including N, P2O5 and K2O, more than or equal to 0.4wt% of microelements and 0.05-0.10wt% of a plant growth regulator, wherein the effective elements include 18.0-23.0wt% of N, 10.0-15.0wt% of P2O5 and 20.0-25.0wt% of K2O; and the microelements include 0.1-0.5wt% of B, 0.1-0.5wt% of Fe, 0.1-0.5wt% of Zn and 0.1-0.5wt% of Mo. The fertilizer disclosed by the invention is prepared by mixing nutrients including macroelements, medium elements, microelements and the like and the plant growth regulator at a proper ratio according to the soil nutrient supply characteristic of Qaidam Basin and the nutrient demand characteristic of the flowering and fruiting period of wolfberry so as to have the characteristics of high concentration, good water solubility, nutrient completeness and high utilization ratio; due to the application of the fertilizer, the requirements for a great deal of N and K in the flowering and fruiting period of wolfberry are met, and therefore, the aims of increasing the yield of wolfberry and improving the quality are achieved. The fertilizer can be applied to wolfberry fertilization along with water under a drip irrigation condition.

The invention relates to a preparation method of a pH-responsive adriamycin nano-drug capsule with a surface positive charge. The preparation method comprises the steps of uniformly mixing adriamycin nano-drug particles with surfaces modified by acrylate with a certain amount of neutral monomer acrylamide (AM), a positively charged monomer N-[3-(dimethylamino)propyl]methacrylamide (DMAPMA) and a pH-responsive degrading cross-linking agent in deionized water, adding an oxidation-reduction initiator ammonium persulfate / tetramethylethylenediamine (TEMED) to initiate in-situ free radical polymerization, and carrying out dialysis and freeze drying, so as to obtain the adriamycin nano-drug capsule. By changing the type of cross-linking agents and regulating the dosages of the monomers and cross-linking agents, the adriamycin nano-drug capsule with relatively good properties such as relatively small mean grain size, dispersion uniformity, relatively high dissolution velocity and dissolution rate can be obtained. The invention provides a novel thought and option, the operation of the method is simple, and the accurate control of the structure and the surface and the in-vivo efficient delivery of the adriamycin nano-drug capsule can be realized.

The invention provides a medicine composition for Jardiance solid dispersion and a preparation method thereof. The method comprises the steps that Jardiance and polyethylene glycol are prepared into the solid dispersion in a melting mode, and the solid dispersion is mixed with other pharmaceutically acceptable excipients to form the oral solid preparation. According to the medicine composition, the main medicine solubility is improved, rapid medicine disintegration is facilitated, and therefore the composition dissolution speed is increased.

The invention discloses a berberine hydrochloride caffeic acid eutectic compound, a preparation method thereof, a composition of the berberine hydrochloride caffeic acid eutectic compound, and applications, and more specifically, discloses a novel berberine hydrochloride caffeic acid eutectic compound taking berberine hydrochloride as a medicinal active component and caffeic acid as an eutectic precursor, a preparation method of the berberine hydrochloride caffeic acid eutectic compound, and applications of the berberine hydrochloride caffeic acid eutectic compound as a medicinal active component in preparation of medicines used for preventing and treating cardiovascular diseases, preventing virus, treating cancers, reducing blood fat, reducing blood sugar, preventing inflammation, preventing bacteria, and preventing infection.

The invention relates to partially calcined limestone for rapid slagging of a converter and a preparation method of the partially calcined limestone. A surface lime layer of the prepared partially calcined limestone is high-activity lime, and an inner core component of the prepared partially calcined limestone is calcium carbonate. The preparation method comprises the following steps: taking limestone containing calcium carbonate as a raw material, crushing, cleaning and screening to obtain blocky limestone of 15-20mm, preserving heat in a heating furnace of 200-300 DEG C for 2-3h, and performing calcining in a rotary kiln of 3-6 revolutions / min at 800-900 DEG C for 0.5-0.8 h to obtain the partially calcined limestone. When the prepared partially calcined limestone is applied to a converter for slagging, the dissolution process avoids the stagnation stage existing in the initial dissolution stage when limestone is directly used for slagging, and the initial dissolution rate is higher; when the residual amount of CO2 is 25-30% by mass, the heat required for decomposition is reduced by more than 32%, so that the heat balance of the converter is favorably maintained, and the application range of slagging by applying part of calcined limestone can be expanded to produce steel with higher carbon content.