7results about How to "Achieve selective removal" patented technology

The application discloses a method for removing burrs on a polyimide pyramid microstructure surface. After super-precision fly-cutting machining is completed, the method changes the rotating direction of a tool, keeps the relative motion track of a workpiece unchanged, keeps the Z-direction position of the tool unchanged, and air-cuts 3-5 times along the original path. The burrs are removed by utilizing the characteristics that the burr height is greater than the material removal depth of the body, while the size accuracy (change rate <±1%) of the pyramid microstructure is maintained, and the burr removal rate is greater than 90%. The method does not need to replace the tool or additional equipment, is simple to operate, and is suitable for improving the surface quality of the microstructure after super-precision machining.

The invention discloses a method for selectively removing tetracycline antibiotics in water, and relates to the field of wastewater treatment. The core technology of the method is as follows: the TCs in the water are selectively removed by using complex interaction between background matrixes such as Mn (II) and HCO3 in the wastewater and the TCs and adding an oxidizing agent H2O2 at the same time. The method can selectively and efficiently remove TCs in water, has the advantages of simplicity in operation, low cost, environmental friendliness, difficulty in interference of background matrixes and the like, has a wide application prospect in the field of water pollution control, and is a new discovery for developing a water pollution control technology based on pollutant properties and the background matrixes in water.

The present application relates to the technical field of semiconductor, in particular to a deep via hole preparation method and a preparation method of back-illuminated image sensor, comprising the following steps: providing a semiconductor stack structure, the semiconductor stack structure comprising a composite layer and a termination layer, a local stop layer being formed on the composite layer and being close to the termination layer; etching the composite layer to the termination layer and stopping at the local stop layer; removing the local stop layer, etching the composite layer to the termination layer and stopping at the termination layer to form the deep via hole. According to the design position of the deep via hole and the vertical depth of the first etching, the local stop layer is preset in the corresponding area of the composite layer, so that the damage of the lower structure caused by over-etching in the traditional process can be avoided.

The present application belongs to the technical field of mineral processing and environmental protection, and particularly relates to a method for removing impurity metal ions and compounds in raffinate acid. The impurity metal ions and compounds such as iron, magnesium and aluminum in the raffinate acid are selectively removed under the synergistic action of adsorption materials and flotation reagents. The method mainly uses the strong adsorption of the adsorption materials and the strong selectivity of the specific flotation reagents, and uses the adsorption materials and the flotation reagents in combination, and through adjusting and controlling the types, the ratio, the dosage of the adsorption materials and the flotation reagents, and the reaction sequence, the time and the temperature, the selective removal of the impurity metal ions and compounds in the raffinate acid is realized, and the comprehensive utilization rate of the raffinate acid is improved. The method is suitable for the purification system of the raffinate acid in the phosphorus chemical industry, and has the advantages of simple method, strong selectivity, remarkable effect and short action time, and has important significance for solving the problems of difficult disposal and reuse of the raffinate acid, high production cost of the phosphorus chemical industry and serious waste of phosphorus resources.

This invention discloses a bamboo fiber, its preparation method, and a bamboo fiber wound hydrogen storage tank. The preparation method of the bamboo fiber includes the following steps: cutting natural bamboo into equal-length bamboo poles and pretreating them by soaking them in boiling water to remove water-soluble organic matter; mixing hydrogen peroxide, organic acid, and H2SO4 in a certain proportion to prepare a peroxyacid solution, wherein the concentration of hydrogen peroxide in the peroxyacid solution is 7-24 wt%, the concentration of organic acid is 15-55 wt%, and the concentration of H2SO4 is 0.5-3 wt%; soaking the pretreated bamboo poles in the peroxyacid solution at 50-60℃ for 12-20 hours to obtain bamboo fiber; then soaking the bamboo fiber in an alkaline solution for neutralization, and washing it after neutralization; vacuum drying the washed bamboo fiber and twisting it to extend its length to obtain long fiber; and applying microwave irradiation to the long fiber to obtain the final product.

This invention provides a method and system for hydrothermal-roasting coupled cascade separation and full-component resource recovery of vanadium-phosphorus iron, belonging to the field of resource utilization technology. The invention includes raw material pretreatment, hydrothermal pre-dephosphorization, low-temperature composite salt roasting for vanadium extraction, water leaching and vanadium recovery, and molten reduction alloying. This invention pioneers a coupling mechanism between "hydrothermal pre-dephosphorization" and "low-temperature composite salt roasting for vanadium extraction," and connects it with "molten reduction alloying," forming an inseparable cascade separation and full-scale recovery closed-loop system. Under mild conditions, it achieves a phosphorus removal rate exceeding 92% and a vanadium conversion rate exceeding 99%, reducing energy consumption by approximately 30% and solid waste emissions by more than 85% compared to traditional processes. It simultaneously produces three high-value products: high-purity vanadium pentoxide, agricultural phosphate, and stainless steel master alloy, possessing multiple advantages such as high resource utilization, clean and low-carbon operation, and significant economic benefits.

The invention discloses a mixed bacterium fermentation liquid and a method for preparing lactic acid by cooperating with mechanical thread rolling coupled steam explosion pretreatment of high-lignin-content biomass, and the mixed bacterium fermentation liquid comprises a mixed bacterium liquid composed of brevibacillus brevis, bacillus licheniformis, bacillus steterrae, ochrobactrum pseudointermedium and a liquid culture medium suitable for mixed bacterium growth, and fermenting by using the mixed fermentation liquid, carrying out mechanical thread rolling, and then carrying out steam explosion treatment. According to the method disclosed by the invention, the biomass subjected to fermentation pretreatment is more easily permeated by steam, and the energy of steam explosion can more sufficiently act on the material of which the structure is loosened, so that the energy consumption intensity is greatly reduced, and the generation of harmful byproducts in the high-temperature explosion process of lignocellulose, particularly high-lignin-content biomass, can be effectively reduced; the inhibition of subsequent enzymolysis and fermentation processes is obviously reduced, and cost reduction, efficiency improvement and synergetic improvement of product quality are realized.