Method for producing liquid calcium chloride by using industry waste acid

The invention relates to a preparation method of liquid calcium chloride, in particular to a method for producing the liquid calcium chloride by using the waste industrial acid, which belongs to the technology field of chemical industry. The preparation method is characterized in allowing massive limestone and waste hydrochloric acid obtained by acid washing strip steel to react at a certain ratio and neutralizing with lime cream to obtain calcium chloride at a certain concentration. Proved by the production, the preparation method is capable of effectively reducing the production cost and achieving comprehensive utilization of the waste industrial acid and remarkable economic and social benefits.

Device for accurately determining trace quantity nitrogen in alloy or metal

Method for preparing active carbon by using coke reactivity testing device

The invention relates to a method for preparing active carbon by using a coke reactivity testing device. The method comprises the following steps: adding coke powder into a potassium hydroxide solution by using the coke reactivity testing device, grinding until the grain size is 0.07-0.08mm, adding coal tar and water, and heating a crucible at a temperature raising rate of 8-12 DEG C/minute; when the temperature reaches 400-410 DEG C, introducing nitrogen, wherein the flow rate of nitrogen is 1.0-1.5L/min; when the temperature reaches 850-880 DEG C, insulating for 40-60 minutes; obtaining coarse active carbon; and crushing, washing and drying the coarse active carbon to obtain active carbon. The method for preparing active carbon provided by the invention is carried out in the coke reactivity testing device which is good in tightness. The coke reactivity testing device is capable of precisely controlling the temperature raising rate and the reaction temperature, preventing the active carbon ...

Method for analyzing internal structures and components of inclusions

The invention provides a method for analyzing internal structures and components of inclusions, which comprises the following steps: (1) preparing a sample according to analysis requirements; (2) putting the sample into a scanning electron microscope, carrying out secondary electron morphology observation on the inclusions, and determining an analysis object; placing an analysis object in the middle of a visual field, and adjusting an electron beam and an ion beam to be coaxial; (3) observing the analysis object from an ion beam interface, and determining an area to be cut; carrying out large-beam rapid cutting on the selected cutting area by utilizing an ion beam until a required position is cut; carrying out small-beam fine cutting on the displayed profile of the inclusion; and (4) carrying out energy spectrum surface scanning on the cut surface by utilizing an energy spectrum surface scanning function, and determining the composition of the internal structure components of the inclusions ...

Device for accurately determining trace quantity nitrogen in alloy or metal

Pumping-filtering method and apparatus for quantitatively extracting nano educt

The invention provides a nanometer precipitate fixed quantity abstraction pumping filtration method and a pumping filtration arrangement, which belongs to the field of nanometer precipitate quantitative determination technique, the device includes a pumping filtration machine, a waste liquor collecting flask, a sand core funnel, a cleaning nozzle, a supporting stand, an electrolyzing tank, a carrier frame and so on, using the device to carry the process of pumping filtration solves the loss of precipitate in the transfer process existing in the nanometer precipitate quantitative analysis procedure usually used at present, and improves the accuracy of nanometer precipitate fixed quantity abstraction. The arrangement integrates electrolysis, cleaning and pumping filtration, which reduces the trouble of electrolysing solution in the transfer process, and improves the test precision and provides exact data for new product development.

Method for determining vanadium in vanadium nitrogen alloy

The invention relates to a method for testing vanadium in vanadium-nitrogen alloy. The method has the following steps: crushing and sieving the test sample through 200 mesh, fetching the sample from the erlenmeyer flask, adding H2SO4(1+4) and dissolving it by heating, dropping nitric acid to oxidizing it, adding concentrated H3PO4 and heating to the state that the sulfuric acid emits smoke, and then cooling to room temperature; adding (NH4)2Fe(SO4)2 standard solution, dropping KMnO4 solution till the test solution is red steadily and the color does not fade; adding urea solution, dropping NaNO2 solution till the red color fades, adding NaAsO2 solution, placing, dropping 2-3 drops of CrV indicator, immediately titrating with the ammonium ferrous sulphate standard solution till the color changes from cerise into light green, according to the volume of the consumed ammonium ferrous sulphate standard solution, calculating the content of the vanadium in the sample. The test result of the vanadium ...

Steel ladle without vortexes and working method thereof

The invention relates to a steel ladle without vortexes and a working method thereof, belonging to the technical field of steel making. The steel ladle comprises a slide water gap and a water gap, wherein an annular drainage boss is arranged at the bottom of the steel ladle, and the upper parts of the slide water gap and the water gap are respectively provided with a spiral turbulent flow boss; and the annular drainage boss at the bottom of the steel ladle and the spiral turbulent flow bosses on the upper parts of the slide water gap and the water gap are arranged reversely. When molten steelis output, under the joint action of the annular drainage boss at the bottom of the steel ladle and the reversely arranged spiral turbulent flow bosses on the upper parts of the slide water gap and the water gap, and according to a angular momentum conservation principle, the flowing momentums of molten steel in two different directions mutually counteract, thereby the generation of vortexes is suppressed ...

Pumping-filtering method and apparatus for quantitatively extracting nano educt

The invention provides a nanometer precipitate fixed quantity abstraction pumping filtration method and a pumping filtration arrangement, which belongs to the field of nanometer precipitate quantitative determination technique, the device includes a pumping filtration machine, a waste liquor collecting flask, a sand core funnel, a cleaning nozzle, a supporting stand, an electrolyzing tank, a carrier frame and so on, using the device to carry the process of pumping filtration solves the loss of precipitate in the transfer process existing in the nanometer precipitate quantitative analysis procedure usually used at present, and improves the accuracy of nanometer precipitate fixed quantity abstraction. The arrangement integrates electrolysis, cleaning and pumping filtration, which reduces the trouble of electrolysing solution in the transfer process, and improves the test precision and provides exact data for new product development.