Method and apparatus for testing air permeability of converter bottom blowing mushroom head

The invention provides a method for testing the ventilation of a bottom-blowing converter mushroom and the equipment thereof, the testing method includes the following steps that: 1) a mushroom is arranged in a fixation device with an air inlet and an air outlet, the mushroom abutting to a fixed ring and is filled with sealing material around; 2) the air inlet of the fixation device is communicated with an air supply with constant pressure and then a flow measuring device is used to determine the maximum ventilation flow of the mushroom under a certain pressure. The corresponding testing device mainly comprises the air supply with constant pressure, the fixation device for the mushroom and the flow measuring device which are connected by pipeline. The invention can be used to learn about the operating states of the bottom- blowing converter in different periods through measuring the ventilation parameter of the mushroom so as to give full play to the mixing function of the mushroom in actual ...

Rotary furnace cooling agent and manufacturing method thereof

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic dry ash and ferreous dry waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to0.50%. The manufacturing method comprises: the iron scale, the carbonic dry ash and the ferreous dry waste material are firstly sent into a blending machine to be mixed together and evenly mixed withthe caking agent; after being evenly mixed, the materials are sent into a mixing mill and then into a twin-roller ball press machine to be pressed into conglomeration; the pressed conglomeration is screened ...

Rotary furnace cooling agent made of metallurgical waste material product and using method thereof

The invention provides a rotary furnace cooling agent made of metallurgical waste material product and a using method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic waste material and ferreous waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to 0.50%, 2m drop strength is more than or equal to 5 times, and the compression strength is more than or equal to 1500N. The adding methods of the carbonic and ferreous conglomeration which is taken as the rotary furnace cooling agent comprises: adding before Fe is mixed, adding after Fe is mixed as well as adding respectively before and after Fe is mixed. The ...

Submerged arc foaming agent of LF (Low Frequency) furnace

The invention discloses a submerged arc foaming agent of an LF (Low Frequency) furnace, which is applied to foaming refining slag in the LF furnace during temperature rise and is prepared into a mixer from the following components in percentage by weight: 35-65 percent of CaCO3, 38-18 percent of MgCO3, 5-15 percent of CaC2, 5-15 percent of NaCl, 5-15 percent of CaCl and inevitable impurities. The components are required to meet the relationships of CaCO3+MgCO3>= 50% and NaCl+CaCl=10-30%. The foaming agent has the advantages of short foaming time of the refining slag, long foam maintaining time, safe and quick heating, low noise in the temperature rise process, shortening in the temperature rise time, improvement on the temperature rise efficiency by over 40 percent, no additional pollution to the molten steel and no reduction on the function of the refining slag.

Low temperature alkaline phosphatase and preparation method thereof

The invention belongs to the field of gene engineering, and relates to novel alkaline phosphatase and a preparation method thereof. The cDNA sequence of low temperature alkaline phosphatase shown as SEQ ID NO 1 in a sequence table is cloned to a vector for genetic engineering, and expressed to obtain the low temperature alkaline phosphatase. According to codon bias of Escherichia coli, the DNA sequence of the TAB5 low temperature alkaline phosphatase is transformed, so that the DNA sequence is highly expressed in the Escherichia coli; the alkaline phosphatase is purified by nickel affinity chromatography and ion exchange chromatography; and more than 90mg of TAB5 alkaline phosphatase with the purity of over 99 percent is obtained from each liter of Escherichia coli liquid finally. The invention can be applied to research in the field of molecular biology of the field of life science, particularly multi-step reaction for heat inactivation of alkaline phosphatase, such as sample treatment ...

Premelting compound refining slag for producing ultra-low sulfur steel

The invention discloses premelting compound refining slag for producing ultra-low sulfur steel. A mixture is prepared from the following chemical constituents in percent by mass: 40 to 50 percent of CaO, 10 to 20 percent of MgCO3, 5 to 15 percent of CaF2, 2 to 10 percent of BaCO3, 15 to 25 percent of Al and 4 to 6 percent of CaSi, wherein the sum of the mass percent of the substances and unavoidable impurities is 100 percent, and a ratio of CaO to CaSi is between 8 and 11. The refining slag of the invention has good desulfuration effect and can reduce the S content in molten steel from 30 to 50*10<-6> to 10*10<-6>. The desulfuration effect is stable, the molten steel resulfurization and the molten steel recarburization and hydrogen increase do not exist, the corrosion of a furnace liner is light, the use is convenient, and the refining slag can be directly added onto the slag surface and can be also made into core wires to be fed into the molten steel.

Copper electroplating liquid composition used for copper integrated circuit interconnector

The combination includes the copper salt, the mineral acid with anion of the same as the nantokite, the compound containing nitrogen and sulfur, the polymer containing oxygen, or containing a few chlorine ions further. The characteristics are that the composition of the additive of electro plate is simple as well as the quite flattening electroplating surface can be obtained with different line widths. The invention reduces the amount of grinding fluid needed and increases the flatness. Thus, the flattening electroplating surface can be processed by chemical-mechanical grinding further.

Polymeric biological liquid fuel and preparation method thereof

The invention belongs to the technical field of energy and chemical engineering, in particular to a polymeric biological liquid fuel and a preparation method thereof. The polymeric biological liquid fuel and the preparation method thereof are characterized in that: the polymeric biological liquid fuel comprises the raw materials by weight percentage of 1 to 2 percent of alkylolamide, 0.5 to 1.5 percent of potassium hydroxide, 2 to 5 percent fatty alcohol, 60 to 80 percent of methanol, 7 to 15 percent of ethanol and 8.5 to 16.5 percent of additive; and the method comprises the steps of sequentially placing the raw materials in a reaction kettle, heating the raw materials to 35 DEG C, aerodynamically stirring the raw materials for 20 minutes, standing the raw materials at normal temperature for over 2 hours and filtering the raw materials to obtain a finished product. The polymeric biological liquid fuel and the preparation method thereof have the advantages of avoiding toxicity, harm, smoke ...

Production of nicotine acid and catalyst therefor

Production of nicotine acid and catalyst therewith are disclosed. It is carried out by using catalyst with vanadic anhydride and transition metal oxide on carrier, taking 3-picoline, oxygen and water as material, gas-phase oxidation reacting, producing nicotine acid, and controlling catalyst grain on carrier surface and transition metal oxide between 40-200 nanometer. Its advantages include low cost, high conversion rate and selectivity.

EXTRACTION OF ANTIBIOTIC FROM FERMENTED LIQUOR BY NEUTRAL ORGANIC PHOSPHORUS (PHOSPHINE) KIND OF EXTRACTANTS

Expression and purification system using recombinant protein as label

The invention belongs to the technical field of biology and relates to a protein expression and purification system, in particular to an expression and purification system using a recombinant protein as a label. The protein expression and purification system is characterized in that the N end of a target protein is connected with a novel fluorescent protein sGFP (Green Fluorescent Protein) label, and the C end of the target protein is connected with histidine His peptide and is added with a polynucleotidase cutting site, thereby the protein is fused and expressed in full length; and meanwhile, a protease cutting site can be added between the target protein and the label as required. The protein expression efficiency of the system can be improved so that the yield of the target protein is improved, and the full-length protein is green in visible light so that the protein expression effect and a protein purification process can be monitored; and people can monitor the expression efficiency ...

Rotary furnace cooling agent made of metallurgical waste material product and using method thereof

The invention provides a rotary furnace cooling agent made of metallurgical waste material product and a using method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic waste material and ferreous waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to 0.50%, 2m drop strength is more than or equal to 5 times, and the compression strength is more than or equal to 1500N. The adding methods of the carbonic and ferreous conglomeration which is taken as the rotary furnace cooling agent comprises: adding before Fe is mixed, adding after Fe is mixed as well as adding respectively before and after Fe is mixed. The ...

Rotary furnace cooling agent and manufacturing method thereof

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic dry ash and ferreous dry waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to 0.50%. The manufacturing method comprises: the iron scale, the carbonic dry ash and the ferreous dry waste material are firstly sent into a blending machine to be mixed together and evenly mixed with the caking agent; after being evenly mixed, the materials are sent into a mixing mill and then into a twin-roller ball press machine to be pressed into conglomeration; the pressed conglomeration is screened ...

EXTRACTION OF ANTIBIOTIC FROM FERMENTED LIQUOR BY NEUTRAL ORGANIC PHOSPHORUS (PHOSPHINE) KIND OF EXTRACTANTS

Method for comprehensively treating and utilizing dust sludge

The invention provides a method for comprehensively treating and utilizing dust sludge. The method comprises the following steps of: (1) dispensing: carrying out dispensing calculation according to main ingredients of various iron-containing dust sludge to ensure that the excess coefficient of the content of free carbon reaches 1.0-1.8; (2) mixing: uniformly mixing materials by using mixing equipment; (3) molding: pressing the mixed material into a dust sludge block mass with a granularity of 5-15mm by using molding equipment; (4) drying: drying the molded dust sludge block mass at a temperature below 300 DEG C; (5) charging: after steel-making molten iron in a molten iron pot is blended into a rotating furnace, putting the dust sludge block mass into the hollow molten iron pot through charging equipment according to a weight determined by calculation, preheating and partially reducing the dust sludge block mass by utilizing the molten iron pot and the heat of residual molten iron in the ...