398 results about "Dressing method" patented technology

A method of dressing seeds is disclosed. The method utilizes a seed treatment slurry which is applied to seed by subjecting the seed and seed treatment slurry to a dual asymmetrical centrifugal mixing motion. The method provides uniformly dressed seeds and is suitable for dressing small seed lots.

A dressing apparatus for use in a polishing apparatus for polishing a substrate to planarize a surface of the substrate is disclosed. The dressing apparatus includes a dresser disk, a dresser drive shaft coupled to the dresser disk, a pneumatic cylinder configured to press the dresser disk against the polishing pad through the dresser drive shaft, a pressure-measuring device configured to measure pressure of the gas supplied to the pneumatic cylinder, a load-measuring device configured to measure a load acting on the dresser drive shaft, and a pressure controller configured to control the pressure of the gas supplied to the pneumatic cylinder. The pressure controller is configured to establish a relationship between the pressure of the gas and a pressing force of the dresser disk against the polishing pad, based on measurement values of the pressure-measuring device and the load-measuring device.

The invention discloses an ore dressing method for removing pyrrhotite from iron ore. The ore dressing method for removing the pyrrhotite from the iron ore includes that performing crushing, ore grinding, grading and low intensity magnetic separation techniques to obtain low intensity magnetic concentrate, wherein the TFE grade of the low intensity magnetic concentrate is more than or equal to 65.0%, and the low intensity magnetic concentrate comprises 0.5-1.4% of S; carrying out reverse flotation roughing and reverse flotation selection on the low intensity magnetic concentrate to obtain low-pyrite concentrate with less than 0.15% of S. Weighted by the dry ore amount for the reverse flotation, the reverse flotation roughing chemical comprises (1) pH regulating agent, to be specific, 800-1200 g / t of sulfuric acid; (2) activating agent, to be specific, 80-150 g / t of copper sulfate; (3) collecting agent, to be specific, 250-400 g / t of iso-butyl xanthate and 150-250 g / t of butyl dithiophosphate; (4) foaming agent, to be specific, 30-70 g / t of 2# oil. The ore dressing method for removing the pyrrhotite from the iron ore uses the butyl dithiophosphate and butyl xanthate or iso-butyl xanthate to form sulfur content reducing chemical mixture, the molecular arrangement between the chemical micelles is improved to form a synergistic effect, the chemical is good for mineralizing and adsorbing, the hydrophobicity and the floating speed are properly reinforced, and the sulfur content of the iron concentrate is reduced to less than or equal to 0.03-0.15%. The ore dressing method for removing the pyrrhotite from the iron ore is especially suitable for removing the pyrrhotite from the iron ore with pyrrhotite through reverse flotation.

The invention relates to an ore dressing method for recycling scheelite from tungsten ore which is rich in arsenopyrite. The method is characterized in that: (1) the flotation of sulphide ore is performed: the tungsten ore is crushed, ground and floated so as to obtain the sulphide ore and sulphide ore flotation tailing which are mainly composed of arsenopyrite; (2) the rough flotation of scheelite is performed: the sulphide ore flotation tailing is mixed with sodium carbonate and sodium silicate, then is added with a collector, namely, sulfating nascent soap; the scheelite concentrate and the coarse ore and the scheelite coarse flotation tailing are obtained by stirring, rough flotation, fine flotation and scavenging. The method provided by the invention is characterized in that the process is simple, the beneficiation reagent has low cost, the recovery rate of tungsten is high, and scheelite concentrate and coarse ore with the recovery rate of tungsten ranging from 80 to 90 percent and containing WO3 which accounts for 4 to 10 percent is obtained.

The invention relates to an ore-dressing method for low-grade bauxite, and the method can be used for efficiently solving the problems of incomplete ore dissociation, difficult equipment maintenance, high energy consumption, and no self-contained water system existing in the method in the prior art. The technical scheme of the invention is realized via the following steps of: (1) breaking and homogenizing the bauxite; (2) selectively dissociating the bauxite; (3) floating by virtue of micro-bubbles; (4) discharging a combined-type concentrate; (5) discharging combined-type tailings; and (6) treating and circulating water. The method disclosed by the invention is easily-met in condition, less in power consumption, high in yield, low in pollution, energy-saving and environmentally-friendly;and by utilizing the circulated water, the water consumption is reduced, thus greatly decreasing the production cost.