30results about How to "The process is simple and scientific" patented technology

The invention relates to a method for preparing silica sol. The method for preparing the silica sol is characterized by comprising the following steps of (1), using a Bayan obo tailing as a raw material, leaching the Baiyunebo tailing by using an inorganic acid, and filtering an obtained mixture to obtain an acid-leached solution and an acid-leached residue; (2), roasting the acid-leached residue for 2h to 6h in a condition of 500 DEG C to 900 DEG C to obtain roasted ore; (3), under the regulation of a regulating agent, slowly adding the roasted ore into a sodium hydroxide solution with mass concentration of 5 to 15 percent, wherein the mass ratio of the roasted ore to the sodium hydroxide solution is 1: 0.3 to 1: 1, a reaction temperature is 60 DEG C to 100 DEG C, a reaction time is 2h to 8h, and a stirring speed is 20gama / min. The prepared silica sol has the advantages that the raw material is the acid-leached residue obtained by carrying out acid leaching on the Bayan obo tailing; silicon content is high; impurities are less; the prepared silica sol is high in purity; a process is scientific and simple; the cost is low; the recovery rate of silicon is up to 95 percent or above 95 percent; no three wastes are generated in a production procedure; meanwhile, rare earth in the tailing can be recovered. The method for preparing the silica sol is not only applicable to the Bayan obo tailing, is but also applicable for other ore deposits with higher silicon content.

The invention discloses a coating process for a pipeline three-layer structural anticorrosive coating. The coating process comprises the following steps of: 1) performing fusion bonded epoxy (FBE) coating, namely heating a coated substrate, and spraying epoxy powder to the surface of the coated substrate by an electrostatic spraying process to melt an epoxy powder coating and cure the epoxy powder coating into a bottom coating; 2) performing air dielectric (AD) coating, namely coating adhesive powder to the surface of the coated substrate during gelling of the epoxy powder, wherein the surface temperature of the coated substrate is between 170 and 225 DEG C, and the coating thickness is between 80 and 350 mu m; and 3) performing polyolefin coating, namely winding a fabricated polyolefin coil strip on the coated substrate before an adhesive is cooled, wherein the coating thickness is between 0.5 and 4.0mm. By the AD powder coating process, the wound coating is tightly adhered to the substrate, and the anticorrosive coating has high integrity, cathodic disbonding resistance and compactness.

The invention discloses a method for separating scandium from bayan obo tailings, which belongs to the field of mineral separation. The method takes the bayan obo tailings are raw materials and comprises the following steps of: grading the raw materials; grinding obtained coarse granular ores, and then returning and grading the ground ores; carrying out size mixing on fine granular ores, then performing low intensity magnetic separation on the fine granular ores to form a closed circuit grinding process; performing floatation on the selected tailings subjected to the low intensity magnetic separation; and then carrying out high intensity magnetic separation on ore pulp of the tailings subjected to the flotation, thus obtaining non-magnetic ores which are the concentrated scandium. According to the method disclosed by the invention, the fractionation and mineral separation method is adopted, the technology is simple and scientific, the concentrated scandium with the content of scandium oxide being more than 420ppm and the recovery rate being more than 65% can be obtained, and other recyclable resources in the bayan obo tailings can be further concentrated when the concentrated scandium is obtained.