63results about How to "Coarse granularity" patented technology

The invention discloses a magnetic ore rescreening process for mixed iron ore. The process comprises the following process steps: performing primary ore grinding, performing primary grading, performing primary low intensity magnetic separation, performing primary strong magnetic separation, rescreening, performing high frequency screening and performing secondary ore grinding and selecting. According to the invention, partial qualified iron ore concentrate and partial tailings are thrown out preferentially under the condition that the dissociation degree of useful mineral monomers is insufficient after the primary ore grinding operation, the amount of materials subjected to secondary regrinding and reselecting is reduced, and the aim of reducing the ore dressing cost is achieved.

The invention discloses a process for extracting KCl coarse grains by carrying out flotation on solid sylvinite primary ores, comprising the following steps; (1) crushing the solid sylvinite primary ores; (2) carrying out coarse grinding on the crushed sylvinite; (3) feeding the sylvinite material subject to coarse grinding into a flotation machine for primary rougher flotation and secondary refined flotation; and (4) filtering and drying concentrates obtained by the secondary refined flotation, thus obtaining the high-quality KCl bulky grain product. The product is purely white and transparent; the average grain size is 1mm-2mm; and the KCl grade is not less than 90% (by weight), thus exceeding the common industrial and agricultural high-class KCl product standards of class-II and class-III and reaching the special industrial KCl standard of national standard GB6549-1996I.

A process for preparing the magnetic ferrite powder used for rubber or plastic includes such steps as providing SrBa ferrite (SrO1-xBaOx) *nFe2O3 or Sr ferrite SrO*nFe2O3, proportionally mixing raw materials, grinding, adding assistant, pulverizing, granulating, sintering, pulverizing, tempering, water washing, baking, pulverizing and sieving.

The invention provides a method of leaching vanadium by adding sulfuric acid to stone coal, wet-stacking, oxidizing and converting under the normal temperature and pressure. The method comprses the following steps: (1) dry-grinding bone coal into bone coal powder with a diameter of 1-5mm; (2) adding sulfuric acid and water with a mass ratio of bone coal powder :sulfuric acid :water of 100:10-25:5-12, stirring uniformly, wet-stacking under the normal temperature and pressure for 3-15 days with a stacking height equal to or larger than 2m, and the sulfuric acid is industrial sulfuric acid; (3) adding water according to a solid-liquid weight ratio of 1:0.7-1.5 under the normal temperature and pressure, stirring and leaching for 30-120 minutes, adjusting the PH value to 2-3, and filtering the final solution for deslagging to obtain a blue vanadic sulfate solution.The invention has characteristics of small investment, low energy-consumption, high coefficient of metal recovery, low producing cost and small environmental pollution.

The invention discloses a method for producing roll collars by recycling tungsten carbide from waste hard alloy roll collars. The method includes the steps: recycling coarse-grain tungsten carbide serving as a raw material from the waste hard alloy roll collars, mixing the coarse-grain tungsten carbide with other raw materials according to a formula of the roll collars, placing the mixture into a rotary mill, adding industrial alcohol which has alcohol content more than 95.5% and account for 13.8%-15.7% of the weight of the raw materials into the mixture, milling the mixture for 22 to 24 hours, screening, drying, blending rubber, pressing, removing rubber, pressurizing 6MPa at the temperature ranging from 1410 DEG C to 1460 DEG C in a vacuum pressurizing sintering furnace for longer than 70min, and uncovering the furnace with the temperature not higher than 100 DEG C to obtain the hard alloy roll collars. The method is physical, pollution-free and low in cost, and the recycled tungsten carbide is complete in shape and unchanged in alloy property.

The invention relates to a multi-functional composite additive for intensifying direct reduction of low-grade superfine hematite, which consists of the following components: iron oxides, calcium carbonate and sodium humate. The multi-functional composite additive has reasonable ratio of the components, can effectively improve the strength of low-grade iron ore and pellets and reductibility of the pellets, and promotes ferrite grains to grow; a reverse floatation direct reduction-magnetic separation process can be utilized to produce directly reduced iron powder for steelmaking at one step, the steel production flow is effectively shortened, energy is saved and consumption is reduced; and the multi-functional composite additive has wide component sources and low cost, is suitable for large-scale industrial production, and is particularly applied to the low-grade superfine hematite.

The invention relates to method for manufacturing strontium ferrite rubber plastic magnetic powder with low chlorine content, comprising the steps of: (1) taking 50-76% of iron ore concentrate powder, 10-30% of iron oxide red, 12-16% of strontium carbonate, 0-2% of calcium carbonate and 2-6% of strontium chloride for evenly mixing, and preparing into 7-15mm small balls; (2) presintering the small balls at 1100-1260 DEG C, carrying out heat preservation for 1-4h, cooling to the room temperature, and grinding into coarse powder of 4-8 microns; (3) adding antichlor with the weight accounting for 1-20% of the total weight of the coarse powder, grinding into power of 2-3 microns, stirring and cleaning the powder by water for 10-20min, and standing still; after the powder precipitates, removing the water at the upper layer; and finally, drying the precipitate at 180-400 DEG C, sieving at 70-80 meshes, and obtaining the strontium ferrite rubber plastic magnetic powder. The method combines dechlorination and crushing into grinding working procedure, reduces the chlorine content to 178ppm, saves the water consumption, and has the characteristics of simplifying the technique, being coarse in magnetic powder granularity, good processing performance, high magnetic property and low loss rate of magnetic powder.

The invention provides a method for preparing potassium chloride by using mixed potassic salt ores. The method comprises the following step: firstly crushing the mixed potassic salt ores; then adding the mixed potassic salt ores into a decomposition crystallizer; adding fresh water and circulating saturated E-point liquid into the decomposition crystallizer at the same time, wherein the adding amount of the fresh water is 105%-120% of a theoretical calculating value and the adding amount of the circulating saturated liquid is 2.5-8 times as much as that the adding amount of raw ores; infiltrating a bottom flow of the decomposition crystallizer into grading work to be graded; carrying out ore grinding on a rough grain part and then carrying out flotation; directly carrying out the flotation on a fine grain part; in the flotation process, using the two parts to independently carry out the flotation; carrying out the flotation to obtain concentrate ores, and filtering, washing, dehydrating and drying to obtain a potassium chloride product. The product is good in quality, rough in granularity and relative low in processing cost; the adaptability to the raw ores is very strong; the potassium chloride product produced by the method can be used as an industrial product and can also be used as a farm-oriented potassium fertilizer, so that the application range of the product is widened; the potassium chloride product is rough in granularity and is easy to filter, centrifuge and dehydrate; when the potassium chloride product is dried, the energy consumption is low, so that the production cost of enterprises is reduced.

The invention discloses a preparation method for tungsten copper nickel alloy powder. Atomized copper powder and crystalline tungsten powder are selected and used as raw materials; carbonyl nickel powder is added to the atomized copper powder and the crystalline tungsten powder; mixed materials are put into a steel belt reduction furnace; high-temperature diffusion treatment is carried out at shielding gas or reducible atmosphere; alloy connection of the atomized copper powder and the crystalline tungsten powder is achieved through the diffusion of the carbonyl nickel powder in the atomized copper powder and the crystalline tungsten powder; the tungsten copper nickel alloy powder is obtained through crushing and screening of a crusher after the alloy connection. According to the preparation method for the tungsten copper nickel alloy powder, the prepared tungsten copper nickel alloy powder is even in composition, high in density, good in flowing property and easy to form; the problem of liable segregation in a traditional preparation method is solved; in addition, the preparation technology is simple and easy to operate.

The invention discloses a preparation method for tungsten-copper-cobalt alloy powder. The preparation method comprises the following steps: selecting atomized copper powder and crystalline tungsten powder as raw materials; adding cobalt carbonyl powder into the atomized copper powder and the crystalline tungsten powder to obtain a mixture; putting the mixture into a steel belt reducing furnace to carry out high-temperature diffusion treatment under protective gas or a reducing atmosphere; diffusing the cobalt carbonyl powder in the atomized copper powder and the crystalline tungsten powder, thereby realizing alloy connection between the atomized copper powder and the crystalline tungsten powder; and crushing and screening the mixture by a crusher to obtain the tungsten-copper-cobalt alloy powder. The tungsten-copper-cobalt alloy powder prepared by the preparation method disclosed by the invention is uniform in component, high in compactness, excellent in flowing property and easy to form; the liable segregation problem in a conventional preparation method is solved; and the preparation method is simple and easy to operate.

The invention discloses a dump leaching technique of ground organism of secondary copper sulphide ore with high content of arsenic. The technique comprises the following steps: the secondary copper sulphide ore with high content of arsenic is crushed to 10 to 30mm, and acid mine water of mineral-leaching microorganism with thiobacillus ferrooxidans and thiobacillus thiooxidans is used for leaching the secondary copper sulphide ore with high content of arsenic; while most of the arsenic in the ore is still in leaching residue and a small part of the arsenic is in the leachate, faffinated and electrodeposition liquid; but closed cycle in the production has no effect on the extraction and electrodeposition and standard cathode copper product, thus avoiding the hazard of the arsenic to the environment. The technique has short process, little investment, low cost and energy consumption, no pollution and high rate of recovery, can process the copper ore with high content of arsenic which can not be processed by the traditional smelting technique, and also can process the secondary copper sulphide ore with high content of arsenic and similar secondary copper sulphide ore with high content of arsenic so as to expand the utilization range of resources.

The invention relates to the technical field of production of aluminum oxide and specifically discloses a decomposition crystallization aid for producing aluminum oxide. The decomposition crystallization aid is composed of a component I, a component II and a component III, wherein the component I is selected from any one or several of methanol, ethanol, propanol, glycerol, polyethylene glycol, polypropylene glycol and polyvinyl alcohol; the component II is selected from any one or several of sodium stearate, sodium oleate and sodium humate; and the component III is selected from any one or several of diethanol amine, triethanolamine and polyacrylamide. The decomposition crystallization aid provided by the invention has good water solubility and alkali solubility, and is good in dispersionperformance in a sodium aluminate solution and low in usage amount. It is proved, by a test, that the decomposition crystallization aid involved in the invention is applied to decomposition of the sodium aluminate solution in production of the aluminum oxide and is capable of improving the decomposition rate of the sodium aluminate solution; the particle size of decomposed products is obviously increased; the roasted aluminum oxide is high in strength; and the problems that the particle size is increased and the decomposition rate is increased in a decomposition process of the sodium aluminatesolution can be effectively solved.

The invention discloses a preparation method of tungsten-copper-tin alloy powder. The preparation method comprises the steps that atomized copper powder and crystalline tungsten powder are taken as the raw materials; tin power is added to the atomized copper powder and the crystalline tungsten powder; the mixed powder is placed in a steel band reduction furnace, and is subjected to high temperature diffusion treatment in a shielding gas or reducing gas atmosphere; and through the diffusion of the tin power in the atomized copper powder and the crystalline tungsten powder, alloy connection between the atomized copper powder and the crystalline tungsten powder is realized; and through breaking and screening of a crusher, the tungsten-copper-tin alloy powder is obtained. The tungsten-copper-tin alloy powder prepared by preparation method is uniform in component, high in density, excellent in flowing property and easy to form; the problem that the possibility of segregation in the traditional preparation method is high is solved; and the preparation method is simple in preparation technology and easy to operate.