37results about How to "Stable production control" patented technology

The invention discloses a method for preparing silk protein composite cellulose fibers, which includes steps: firstly, adding degummed waste silk into LiBr solution, dissolving the waste silk to prepare silk protein solution in which silk protein accounts for 3-15%, by weight; secondly, adding the silk protein solution into sodium hydroxide solution with cellulose sulfonate to obtain blended solution of silk protein and cellulose, wherein blended silk protein solution accounts for 5-50% of that of the sodium hydroxide with cellulose sulfonate by weight; and thirdly, spinning the blended solution by coagulating bath and obtaining the silk protein composite cellulose fibers by post-processing. By the method, recovery value of the waste silk is improved greatly, special effects of whitening and skin caring of the silk protein composite cellulose fibers can be realized, and the fibers are smooth and soft to touch as silk, and have the skin caring and whitening effects that the effects of protein powder fibers or blended fibers of protein powder and cellulose solution cannot match.

The invention discloses a process for purifying trichlorosilane and silicon tetrachloride. The process purifies the trichlorosilane and the silicon tetrachloride by means of three-tower continuous rectification and comprises: setting two towers as three-tower continuation; by adjusting process conditions, extracting high-purity trichlorosilane at the top of a rectifying tower 1 by gas phase, while extracting a silicon tetrachloride solution containing a small amount of the trichlorosilane by liquid phase, and feeding the solution into a rectifying tower 2; completing gas phase extraction of residual trichlorosilane and a small amount of the silicon tetrachloride at the top of the rectifying tower 2, and returning the extracts to a synthetic fluid intermediate tank after condensation; and feeding the silicon tetrachloride and high-boiling saline obtained through liquid phase extraction in the rectifying tower 2 into a rectifying tower 3; and carrying out purification on the silicon tetrachloride and the high-boiling saline by the rectifying tower 3 to obtain the high-purity silicon tetrachloride at the top of the tower. The process increases the product yield, the quality, the application and benefits, and realizes stable production control and greatly reduces labor intensity.

The invention discloses a mica treatment process for preparing lithium carbonate by utilizing lepidolite. The process comprises the following steps: putting lepidolite and diluted sulfuric acid into a reaction kettle in a certain ratio at high temperature and normal pressure to react; adding the reacted slurry into a silica sand byproduct which is dried in workshop, and mixing the materials; drying and roasting the mixed powder in a kiln; directly adding water into the roasted material to perform a leaching reaction at a certain temperature; performing cooling crystallization, centrifugal separation, neutralized impurity removal, evaporation concentration and lithium depositing production processes on the leached slurry to prepare battery grade lithium carbonate and industrial lithium carbonate. The process has the advantages that gypsum byproduct in the process can be reduced by more than or equal to 35 percent in comparison with that in the prior art, the overall recovery of lithium carbonate is greatly increased, the quality of lithium carbonate is slightly improved in comparison with that of existing products, and each index can reach the national standard; and the problem of material attachment of a kiln can be solved after the acid leached slurry is added into and mixed with the workshop dried silica slag.

The present invention belongs to the technical field of catalyst preparation, and provides a nitrobenzene hydrogenation aniline preparation catalyst for a fluidized bed. The catalyst provided by the present invention has the following characteristics that: composition is single, the catalyst only contains an active ingredient copper, introduction of a multi-element component to the catalyst is not required, and physicochemical properties of the catalyst are: an average specific surface area of ??350-500 m<2>/g, an average pore size of 2.5-4.0 nm, and an average pore volume of 0.55-0.85 ml/g. In addition, a mass content of the active ingredient copper in the catalyst is 10-25%; a mass percentage of the catalyst with particle size distribution of 125-600 mum is 80-98%, and a mass percentage of the catalyst with particle size distribution less than 125 mum is less than 2%; and the catalyst has characteristics of high activity, uneasy pore clogging, long service life, high selectivity, and the like.

The invention discloses a method for producing a thin-specification low-alloy high-strength diamond plate based on a CSP process. The method comprises the steps of 1, controlling heating temperature,specifically, the charging temperature and the tapping temperature are controlled; 2, controlling threading speeds, specifically, the different threading speeds are controlled according to different thicknesses of rolled finished products; 3, controlling rolling pressure, specifically, rolling force parameters are adjusted according to different thickness specifications; and 4, controlling roll shifting, specifically, after roll changing calibration is finished, circulating roll shifting from a zero point position with steps of 20 mm, 25 mm and 30 mm is started. According to the method, by controlling the heating temperature, the threading speeds, the rolling pressure, and the roll shifting and by adopting a laminar cooling mode for control, the pattern integrity and the plate shape of thelow-alloy high-strength diamond plate are ensured, the related standards and user requirements are met, the stable batch supply is formed, the production process is controlled stably, no production accidents such as scrap steel, and broken casting occur, and the stable batch production of the thin-specification low-alloy high-strength diamond plate produced by the CSP production line is realized.

The invention discloses a production technique of a high-water-soluble-phosphorus sulfur-base compound fertilizer, which comprises the following steps: mixing 20-25 wt% dilute phosphoric acid with a mother solution in an industrial monoammonium phosphate device according to the mass ratio of (2-4):1, and adding 0.88 part of 98 wt% concentrated sulfuric acid and 1.0 part of potassium chloride to react for 4-6 hours; and neutralizing and granulating to obtain the sulfur-base compound fertilizer in which the water-soluble phosphorus content can reach 88% above. The invention also discloses a device for producing the high-water-soluble-phosphorus sulfur-base compound fertilizer by using the technique. The high-water-soluble-phosphorus sulfur-base compound fertilizer has the advantages of smooth appearance and uniform granules. The sulfur-base compound fertilizer device is easy to operate and steady in production control in the granulation process, and can maximally display the productivity.

The invention discloses a three-strand splitting rolling method for rebars with the diameter phi of 12 mm. 18 rolling mills are involved in the method. The 18 rolling mills are divided into a roughing mill unit, an intermediate mill unit and a finishing mill unit, wherein the roughing mill unit includes 6 rolling mills, the intermediate mill unit includes 6 rolling mills, and the finishing mill unit includes 6 rolling mills. Billet steel is rolled by the 18 rolling mills in sequence, and the technological material shape and size of the 18 rolling mills are optimized and adjusted. The three-strand splitting rolling method for the rebars with the diameter phi of 12 mm solves the problems that split strips are seriously folded, the three-strand difference is unstable, and the degree of freedom of rolled pieces is controlled, the height, width and side wall slope of hole patterns are reasonably controlled, it is avoided that the rolled pieces deflect and collide with loop rolls or loop side walls when entering loops, and rolling rejects are generated, it is avoided that the rolled pieces get stuck at loop-rising roll gaps, the surface quality of finished products is improved, and the size of the finished products is stabilized.

The invention provides an online laser marking device and method for a hot-rolled steel billet, and relates to the field of steel production and laser marking. The device comprises a laser, a light guide mechanism, a focusing mechanism, a two-dimensional linear motion mechanism and a control unit, wherein the light guide mechanism is used for guiding the incident direction of laser beams, the focusing mechanism is used for focusing the laser beams into light spots and guiding the light spots to the surface of the steel billet to mark the surface of the steel billet, and the control unit is used for controlling the two-dimensional linear motion mechanism to move according to marking information. The method comprises the steps of mounting, cleaning, positioning, focusing, marking and the like. After the above device is mounted on a production line, an oxide layer on the surface of the steel billet is cleaned, the position and height of the steel billet are determined through a camera and the like, the focusing height of the steel billet is adjusted according to the height, the marking information formed by connecting a plurality of parallel lines or rotating light spots is marked on the surface of the steel billet by using the focused light spots, and air blowing and water cooling are carried out in the marking process, so as to meet the operation requirement in a high-temperature severe environment, and the stability and reliability of the device are ensured.

The invention provides a maltol Grignard section intermediate purification method which comprises the following steps that an intermediate enters a rectifying tower according to the flow of 2 m < 3 >/h, the tower bottom temperature of the rectifying tower is 60 DEG C, and the tower top temperature of the rectifying tower is 40 DEG C; then the intermediate enters a primary flash kettle, wherein theextraction flow is 1.5 m < 3 >/h, the temperature of the first-stage flash evaporation kettle is 85 DEG C, the gas phase of the first-stage flash evaporation kettle is condensed and then enters a second-stage flash evaporation kettle, the temperature of the second-stage flash evaporation kettle is 65 DEG C, the gas phase of the second-stage flash evaporation kettle is condensed and then enters athird-stage flash evaporation kettle, and the temperature of the third-stage flash evaporation kettle is 60 DEG C, the condensed gas phase of the three-stage flash kettle is collected, and the flash kettle is distilled under reduced pressure, wherein the vacuum degree is -0.08 MPa; the materials in the second-stage flash evaporation kettle and the third-stage flash evaporation kettle are returnedto the first-stage flash evaporation kettle every 3 hours; and qualified furfuryl alcohol is extracted from the bottom of the first-stage flash evaporation kettle according to the flow of 0.5 m < 3 >/h. According to the method, the furfuryl alcohol content and yield can be improved, meanwhile, intermittent repeated operation is achieved, and the labor intensity of personnel is relieved.

An NMP lateral extraction method comprises the following steps: 1, neutralizing: neutralizing a raw material to adjust the pH value of the raw material to 9; 2, separating in a first rectifying tower:introducing the neutralized raw material into the first rectifying tower, and separating water, light components and impurities azeotropic with water from the raw material in the first rectifying tower; and 3, separating in a second rectifying tower: introducing the separated raw material obtained in the first rectifying tower into the second rectifying tower, arranging an extraction pipeline atone side of the second rectifying tower, connecting a condenser to one side of the extraction pipeline, arranging a reflux pipeline at the top of the second rectifying tower, separating the raw material by the second rectifying tower, performing total reflux through the top reflux pipeline, intermittently extracting water through the extraction pipeline at one side and the condenser, and obtainingan NMP product at the top of the second rectifying tower. The method has the advantages of realization of intermittent extraction of a small amount of water, and stable production control, allows theproduct quality to meet the NMP content of 99.8% or above, and reduces the water content of the recycled NMP to 100 ppm or below.

The invention provides a paper-plastic composite packaging material with high air permeability and a preparation method thereof. The preparation method comprises a film blowing production process, a hot needle micropore process and a hot laminating compounding process;a PE film material with high air permeability is obtained by optimizing a formula of a PE film and performing micropore treatment on the modified PE film; then a conventional adhesive dry compounding mode and a PE particle extrusion compounding mode are avoided, and paper-plastic packaging materials are compounded in a hot laminating manner, so micropores in a modified polyethylene PE film are prevented from being blocked by dry laminating or extrusion laminating; and finally, the PE film material with stable and excellent air permeability is obtained, shows excellent thermal stability, impact resistance, heat sealability and excellent low-temperature adhesive property, is applied to the fields of daily life article packaging, medicine, the clothing industry, electrical elements and the like, and meets the specific requirements of customer markets.

The invention discloses a sample preparation method capable of realizing quick detection of nitrogen composition and relates to preparation methods of nitrogen detection samples. Through the sample preparation method, the problems that currently, detection time is long, and a before-furnace rapid production requirement cannot be met are solved. The sample preparation method comprises the steps that after molten iron is smelted, iron liquid is poured into a nitrogen detection mold; after the iron liquid is solidified, the sample is taken out and cooled to normal temperature, and the tail of thesample is knocked off; and an oxide layer on the tail of the sample is removed, and the tail is air-dried. The mold comprises a first mold part and a second mold part which are detachably connected,wherein the first mold part and the second mold part define a sample preparation cavity, one end of the sample preparation cavity is provided with a pouring cavity, the sample preparation cavity is communicated with the pouring cavity, the sample preparation cavity and the pouring cavity are both cylindrical cavities, and the pouring cavity is larger than the sample preparation cavity. When the nitrogen detection sample is prepared through the method, the molten iron is directly taken to be poured to form the nitrogen detection sample, it is not needed to form another sample through pouring and then process the sample into the nitrogen detection sample, the sample can be quickly prepared and used for detection, before-furnace rapid detection of the nitrogen composition is realized, and production control is stabilized.