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1055 results about "Wet grinding" patented technology

Manual thermit welding electrode and preparation and using methods thereof

The invention discloses a manual thermit welding electrode and preparation and using method thereof which belong to the technical field of welding. A welding compound of the welding electrode comprises a thermit, a slag forming constituent and an alloying agent. Raw materials are weighed according to the proportion and arranged in a ball mill, a grinding ball and a milling medium are added, and the welding compound is obtained by drying after wet grinding; the welding compound is filled in a cylinder which is made of paper, a lead wire is arranged at one end of the cylinder, and the other end is sealed by a plastic plug, thereby forming the thermit welding electrode; the welding electrode is arranged in a sleeve which is made of paper and sealed for preservation. When in use, the sleeve is fixed on the plug at the back end of the welding electrode, the sleeve is held by a hand, and the lead wire at the front end of the welding electrode is ignited, and then the manual welding or cutting operation can be carried out. The welding electrode is small, lightweight and portable, the welding and the cutting operations are simple, rapid and safe, the welding and the cutting operations can be carried out anytime and anywhere, and the welding electrode can be applied in the welding and the cutting of steels, stainless steels or copper alloy materials.

Breaking grinding dissociation and re-flotation two-stage recovery process of coal in scarce coking

A breaking grinding dissociation and re-flotation two-stage recovery process of coal in scarce coking belongs to a coal breaking dissociation flotation process. (1) coal products in a coal preparation plant serve as raw materials, and the coal which is larger than 6mm is rolled and broke into size smaller than 6mm; (2) a desliming screen is used for desliming on middings smaller than 6mm, middings which is 6-0.5mm enters a three-product dense medium cyclone, and dense medium, middings and gangue are obtained after two-stage medium separation is carried out; (3) the middings smaller than 0.5mm is mixed with clean coal magnetic separation gangue, a grading hydrocyclones group is adopted to conduct high frequency screening to obtain high ash fine silt contained slurry water, and coarse particle are mixed with middings on the midding sculping screen to enter a ball mill for wet grinding; and (4) products after grinding enter a flotation column to conduct flotation, foam clean coal and tailing are respectively concentrated, filtered and dewatered to obtain flotation clean coal and tailing products. The breaking grinding dissociation and re-flotation two-stage recovery process has the advantages that the high ash fine silt in fine fraction is pre-selected, pollution of the high ash fine silt is reduced, equipment separation particle size range is reduced, separation accuracy of equipment is improved, and scarce coking coal resources are recovered as far as possible.

Method for comprehensive utilization of V-Ti-bearing iron ore concentrate by using tunnel kiln reduction-grinding - separation

The invention relates to an iron powder production method by using a tunnel kiln to reduce concentrate pellets containing carbon vanadium ferrotitanium with titanium slag and vanadium pentoxide as combined products. Concentrate pellets are made from vanadium-titanium iron concentrate through crashing and damp milling. The iron powder and tailings are obtained by putting the concentrate pellets into the tunnel kiln to be reduced, crashing, wet-grinding, magnetic separation and gravity separation. The tailings are soaked with titania waste acid to eliminate remnants magnesium and iron. Then the tailings are filtrated and dried to obtain a new material. And then the new material is added with sodium salt to do salt roast and then to be soaked by water, then titanium slag and sodium vanadate are obtained respectively after the water soaking. At last, the vanadium pentoxide is obtained by ammonium vanadate precipitating and calcination deaminase to the sodium vanadate liquid. The invention eliminates the disadvantage of high energy consumption by electric furnace smelting and bad separating effect of vanadium and titanium, difficult control of vanadium and titanium trend and low yield rate of extracting vanadium and titanium through converter blowing iron molten, etc. The invention has the advantages of high yield rate of vanadium, titanium and iron and high resources utilization rate and explores a novel practical way for comprehensive utilization of vanadium, titanium and iron concentrate ore.

Method for preparing WC base hard alloy with high hardness and high toughness

ActiveCN102061401AHigh crystalline integrityHigh hardnessCrystalline perfectionRare earth
The invention discloses a method for preparing a WC base hard alloy with high hardness and high toughness. Nano W powder, nano graphite powder and superfine Co powder or superfine Ni powder or superfine Co powder and superfine Ni powder with the specific surface area average granularity of smaller than 0.5 micron are used as raw materials; superfine Cr3C2 and rare earth are used as combined doping agents; the addition amount of the superfine Cr3C2 is controlled to account for 6-8 percent by mass of alloy binding agent; the addition amount of rare earth is controlled to account for 0.3-0.7 percent by mass of alloy binding agent in the terms of oxide; W-Co-C or W-Ni-C or a W-Co-Ni-C mixed material which is combined and doped by superfine Cr3C2 and rare earth is prepared by adopting a wet grinding process; an alloy press blank is prepared by adopting a die forming or hydrostaticisostatic forming process according to the product size and appearance characteristics; alloy is sintered by adopting a vacuum-sintering process or a pressure sintering process; and the alloy sintering temperature is controlled between 1,360 DEG C and 1,420 DEG C. According to the invention, WC base hard alloy with high crystalline perfection, pure plate-shaped crystal structure and isotropy can be prepared and the double-high performance characteristics of the alloy are realized.

Chromium residue detoxifying process

The invention belongs to the technical field of chromium residue detoxifying, and discloses a chromium residue detoxifying process. The process comprises the following steps of: performing wet grinding on chromium residue, adding water into the chromium residue to prepare chromium residue slurry; and after being subjected to acid-leaching reduction reaction, performing solid-liquid separation on the chromium residue slurry to obtain a filter cake, namely the detoxified chromium residue. The process is characterized in that: under the condition of not changing the original alkaline environment of the chromium residue, a reducing agent 1 is added into the chromium residue directly, and then the reducing agent and the chromium residue are subjected to wet grinding to form particles with 100 to 300 meshes; and the water is added to prepare the chromium residue slurry with 30 to 45 baume degrees, wherein the reducing agent 1 is sodium sulphide, sodium bisulfide, sodium thiosulfate or sodium pyrosulfite. The process has simpleness, thorough detoxification, no chromium return phenomenon and easy implementation of mass production; and the process prolongs effective reduction reaction time, improves reaction efficiency, saves the using amount of acid during the acid-leaching reduction, and has low processing cost because Cr6+ in the chromium residue is subjected to two times of dissolution and reduction.

Automatic arc slab rough grinding machine

The invention provides an automatic arc slab rough grinding machine which comprises a base, stand columns, an arched girder and an adjustable working platform in the middle of the base. The two ends of the arched girder are fixedly connected with arched girder lifting devices arranged on the stand columns, and the arched girder lifting devices drive the arched girder to slide along the stand columns synchronously in the vertical direction. A grinding head lifting device and a circular motion mechanism are arranged on the arched girder, and the grinding head lifting device is fixed to the circular motion mechanism and drives a grinding head device fixed in the grinding head lifting device to make contact with or be separated from the surface of a workpiece fixed to the adjustable working table. Water is sprayed on the grinding head device so that wet grinding can be conducted between the grinding head device and the workpiece during work. The circular motion mechanism is matched with a long chain fixed to the arched girder, and drives the grinding head lifting device to do the circular motion in a rail direction of an arc-shaped guide rail on the arched girder and to grind the workpiece on the adjustable working table. By means of the automatic arc slab rough grinding machine, accuracy and efficiency of grinding the workpiece are improved, the working environment for workers is improved, and grinding powder is prevented.

Preparation process of wet-process superfine modified calcium carbonate

The invention discloses a preparation process of wet-process superfine modified calcium carbonate. The preparation process comprises the following steps: performing cleaning and screening, rough crushing, fine crushing, dry grinding and grading on calcite ores; collecting fine powder of 600 meshes and preparing slurry with water in such a manner that the solid content is 70%-80%; adding a modifier sodium stearate to the slurry for modification treatment and then performing wet grinding, and adding a grinding medium zirconium oxide microspheres and a dispersant sodium polyacrylate during grinding, wherein the volume ratio of the grinding medium to the slurry is 1: 1.5, and the dosage of the modifier is 0.6%-1.2% of the solid content; and putting the slurry obtained after the wet grinding through a vibrating screen, collecting the obtained wet-process superfine modified calcium carbonate slurry into a slurry barrel for flashing drying, collecting the finished product and packaging. The new preparation process is adopted; the wet grinding-modifying integrated technique and the flashing drying technique are adopted so that the production efficiency is high and the production cost is low; the product has the advantages of small particle size, low oil absorption value, high activity and the like; and the major product quality indices are at the international leading level.

Circularly-tanning technology for chrome tanning liquor of sheep garment leather

The invention discloses a circularly-tanning technology for chrome tanning liquor of sheep garment leather. The circularly-tanning technology comprises the following steps: conditioning, drying, shearing, main-soaking, fleshing, degreasing, pickling, softening, disacidifying, softening, pickling, tanning, wet grinding, retanning, neutralizing, adding grease, retanning, dyeing hair, and dyeing plates. According to the circularly-tanning technology for chrome tanning liquor of sheep garment leather, the formation of hexavalent chromium can be effectively reduced, and the chrome waste liquor flocculation is omitted. According to the test on the chrome content after the chrome tanning liquor is utilized, the chrome waste liquor can be recycled repeatedly by supplementing corresponding chrome powder during next-time recycling, thereby realizing the clean production of tanned leather industry. According to the circularly-tanning technology, the sealed no-emission utilization of a chrome resource can be guaranteed so as to greatly reduce environmental pollution, effectively lower waste water emission and save enterprise waste treatment and production cost. In addition, the quality of the produced leather is consistent with that of the common chrome tanned leather, the shrinkage temperature is above 100DEG C, and a leather body is soft, plump and flexible, is colorful, has pure white hair and has no effect on the dyed hair and the dyed plates.

Recovery method for valuable metals in tailings

InactiveCN104164572ALow raw material requirementLow costProcess efficiency improvementRecovery methodMaterials science
The invention discloses a recovery method for valuable metals in tailings, and belongs to the field of treatment for tailings of nonferrous metallurgy. The method comprises the following steps of: mixing the tailings, bentonite and a chlorinating agent, then wet-grinding to generate green balls, drying the green balls and then carrying out chloridizing roasting in a rotary kiln, cooling the roasted balls to obtain qualified pellets, discharging the smoke generated during roasting through multi-stage washing, and conveying smoke dust containing the valuable metals in solution to form recovery solution; filtering the recovery solution to obtain a filter cake, that is, gold-silver-lead residues, and treating the gold-silver-lead residues to recover gold, silver and lead; adsorbing the filtrate after filtering through active carbon, and neutralizing by lime to obtain neutralized filter residue, that is, copper-lead-zinc residues, and treating the copper-lead-zinc residues to recovery copper, zinc and lead; and evaporating and concentrating the filtrate after neutralization, and then recovering the chlorinating agent. The method has the advantages of being low in requirements on the treated raw materials, high in adaptability, short in process flow, low in cost, simple to operate, high in recovery rate, and the like.

Ultra-fine hard alloy coated powder and method for preparing same

InactiveCN101186990AReduced tendency to aggregate and growWell mixedLiquid/solution decomposition chemical coatingCarbonizationTitanium carbide
The invention discloses a super-fine cemented carbide coating powder and process of preparation thereof. Super-fine hard-phase carbonization tungsten in the cemented carbide coating powder and other carbides such as titanium carbide, tantalum carbide, niobium carbide, vanadium carbide and/or chromium carbide are composed around by cobalt-phase ultra-fine powder particles. Karl Fischer's mean particle size of the super-fine cemented carbide coating powder is <=1 mu m. The super-fine tungsten carbide of the invention is put into the liquor of water-soluble metal cobalt-salt after being activated and dispersed with other hard-phase of carbide powder, the super-fine carbide powder and other hard-phase of carbide powder are taken as the core, chemical coprecipitation coating is employed in the reaction, and a uniform cobalt carbonate or cobalt hydroxide inhibitory coating is formed on the surface of the tungsten carbide powder and other hard-phase of carbide powder. The coprecipitation coating powder can be made into the super-fine cemented carbide coating powder by filtering, washing, and drying and low temperature reduction. The invention has the advantages of simple technique and low cost, which can take place the existing cemented carbide wet grinding mixture and the preparation method. High quality super-fine cemented carbide can be prepared by utilizing the powder of the invention.
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