36results about How to "Scientific and rational use" patented technology

The invention relates to the technical field of material preparation, in particular to a method for preparing lanthanum cerium oxalate from rare earth polishing powder waste residue. The method comprises the following steps: reacting to leach the recovered rare earth polishing powder waste residue in concentrated sulfuric acid to obtain a lanthanum cerium sulfate solution; separating the lanthanum cerium sulfate solution from solid residue, and adding oxalic acid to obtain a lanthanum cerium oxalate precipitate; and filtering and separating the lanthanum cerium oxalate precipitate, washing to neutrality, and drying to obtain the finished lanthanum cerium oxalate product. Fluorides such as hydrogen fluoride are not required, the polishing powder waste residue is scientifically and reasonably utilized comprehensively, and the whole recovery process is environment-friendly. The method has the characteristics of small investment, low recovery cost, simple process flow, high recovery rate, environment friendliness and the like.

The invention provides non-autoclaved aerated concrete containing bauxite tailings and a preparation method thereof. The non-autoclaved aerated concrete is prepared by taking bauxite tailing powder, fly ash, lime, gypsum, cement, water, aluminum powder paste and an additive as raw materials. The preparation method comprises the following steps: converting non-active minerals into high-activity aluminum oxide and silicon oxide by adopting the high-temperature-treated bauxite tailings; then generating a new product by aluminum oxide and silicon oxide under a non-autoclaved condition, wherein thenew product can exist stably so that the specific strength of the aerated concrete is improved. The invention provides a novel bauxite tailing comprehensive utilization manner; recycling of industrial solid wastes can be realized so that the non-autoclaved aerated concrete has profound environment protection meaning and social benefits.

The invention relates to a toothed multi-pole T-type connection protrusion welding method for a cable bridge, the method comprises the following steps of: making the end part of the workpiece connected with the end face into a tooth shape, When welding, the tooth shape of the end of the workpiece is used as a bump, the workpiece with the bump is clamped up and down by the jig, the alignment of theplanar workpiece and the bump workpiece is clamped by the jig, the clamps of the two parts of the workpieces are provided with conductive blocks, and the conductive blocks and the T-shaped connectedwelded workpiece are closely fitted to form the current channel needed for welding; At least a plurality of weld stations can be arrange along that length direction of the cable tray for simultaneouswelding, When welding, the workpiece with toothed bump compresses the welded part of the planar workpiece, and the electric current is inputted at the same time. Under the action of large electric current, because the toothed bump conductive contact surface is small, the resistance increases instantaneously, and the overheating reaction occurs at the contact area between the workpiece bump and theplanar surface to form a dot-shaped continuous welding surface.

The invention discloses a method for establishing artificial grassland under a photovoltaic rack. Under the environment of a photovoltaic rack, No. 3 grassland miscellaneous alfalfa is single-sown or grassland No. 2 miscellaneous alfalfa and awnless brome are mixed; Or use microbial fertilizer when sowing mixed grassland. Through the reasonable planting of appropriate grass species and the adoption of appropriate sowing methods and fertilization types, the problems of difficulty in planting grass and low yield of pasture under photovoltaic racks are solved, and economic benefits are improved.

The invention discloses a tobacco raw material classifying and grouping method. The method comprises the steps as follows: collecting ecological information of a tobacco planting land, extracting the major component of the ecological information, analyzing the extracted major component with cluster analysis to obtain the classification result, and verifying the classification result; and after the tobacco raw materials are classified, collecting chemical constituent indexes of the tobacco raw materials, extracting the major component of the chemical constituent indexes, analyzing the major component with cluster analysis to obtain the grouping result, and verifying the grouping result. The method classifies the tobacco raw materials according to the ecological information of growth in terms of the characteristics of the tobacco raw materials as agricultural products, takes into consideration that the tobacco raw materials serve as the processing raw materials of industrialized products, and groups the tobacco raw materials in the same category according to the chemical constituents. The classifying and grouping method can provide scientific and reasonable guide and support for cigarette formulation design, threshing and redrying, and establishment of group processing module, facilitates the quality improvement of cigarette products, and draws on tobacco raw materials more scientifically and reasonably.

The invention relates to a method for producing fuel oil and lubricant base oil by hydrogenating all fractions of coal tar. The method comprises the following steps of: performing pressure reduction on the all fractions of coal tar by virtue of a pressure reduction valve after hydroprocessing on the all fractions of coal tar is finished, and flashing to separate out a light product and a heavy product; performing isodewaxing on the heavy product; and fractioning the heavy product, successively together with the light product, through a heat high fraction separator, a cold high fraction separator, a cold low fraction separator and a fraction tower to obtain the fuel oil and the lubricant base oil which are good in quality and meet a state standard request. The method is simple in process procedures, easy to control, and safe and stable in operation; and the all fractions of coal tar can be scientifically and reasonably utilized, the production economic benefit is further improved, and a certain active function in overcoming the defect of the fuel oil and the lubricant base oil in China is achieved.