Abstract

Provided is a preparation method for nano-tungsten carbide, comprising the following steps: pressing a tungsten oxide to obtain a tungsten oxide pressed blank; performing flame vaporization on the tungsten oxide pressed blank, and cooling and collecting the obtained tungsten oxide vapor to obtain nano-tungsten oxide particles; reducing the nano-tungsten oxide particles to obtain a nano-tungsten powder; and mixing the nano-tungsten powder with carbon, and carbonizing the obtained mixed powder to obtain nano-tungsten carbide. The provided preparation process is simple and convenient, yields high-quality nano-tungsten oxide and nano-tungsten carbide, and is suitable for industrial production.

IPC Classes  ?

• C01B 32/949 - Tungsten or molybdenum carbides
• B82Y 30/00 - Nanotechnology for materials or surface science, e.g. nanocomposites
• B82Y 40/00 - Manufacture or treatment of nanostructures

Abstract

A method and structure for large-footage excavation blasting of a small-section tunnel by means of central hole charging. The structure comprises: a central hole (0) provided in the center of a tunnel section. Using the central hole (0) as the center, slot holes (1), auxiliary holes (2), and peripheral holes (3) are sequentially arranged from inside to outside on the tunnel section. The hole depth of the central hole (0) is greater than the hole depth of the slot holes (1), the hole depth of the slot holes (1) is greater than the hole depths of the auxiliary holes (2) and the peripheral holes (3), and the hole depths of the auxiliary holes (2) and the peripheral holes (3) are equal. In the central hole (0), a portion having a hole depth greater than the hole depth of the slot holes (1) forms a muck pushing blasting region. A muck pushing cartridge (4) that does not extend out of the muck pushing blasting region is mounted in the muck pushing blasting region, and a cartridge is mounted in each of the slot holes (1), the auxiliary holes (2), and the peripheral holes (3). The design of the structure layout is simple, the blast hole diameters are consistent, there is no need to replace a rock drilling device, the operability of on-site workers is high, and the utilization rate of the blast holes is high, so that tunnel excavation footage can be effectively increased, and tunnel excavation costs can be reduced.

IPC Classes  ?

• F42D 1/00 - Blasting methods or apparatus, e.g. for loading or tamping
• F42D 1/08 - Tamping methodsMethods for loading boreholes with explosivesApparatus therefor
• F42D 1/04 - Arrangements for ignition
• F42D 3/04 - Particular applications of blasting techniques for rock blasting
• E21D 9/00 - Tunnels or galleries, with or without liningsMethods or apparatus for making thereofLayout of tunnels or galleries

Abstract

A treatment method and apparatus for tungsten smelting ammonia-nitrogen wastewater, relating to the technical field of wastewater treatment. The method comprises: mixing tungsten smelting ammonia-nitrogen wastewater with a first precipitant, and carrying out first precipitation treatment to obtain a first treated liquid; mixing the first treated liquid, a phosphate, and a magnesium salt, and carrying out primary ammonia-nitrogen removal treatment to obtain a primary ammonia-nitrogen removed feed liquid; mixing the primary ammonia-nitrogen removed feed liquid with a second precipitant, and carrying out second precipitation treatment to obtain magnesium ammonium phosphate and a second treated liquid; and mixing the second treated liquid with sodium hypochlorite, and carrying out advanced ammonia-nitrogen removal treatment to obtain wastewater with a standard ammonia-nitrogen content. The chemical precipitation method and the break point chlorination method are combined, so that the amount of magnesium ammonium phosphate precipitate can be reduced, the purity of the magnesium ammonium phosphate precipitate is improved, the magnesium ammonium phosphate precipitate can be easily recycled, the problems in the prior art of strong odor and severe device corrosion caused by gas overflow when only the break point chlorination method is used are mitigated, and the operation cost is low.

IPC Classes  ?

• C02F 9/00 - Multistage treatment of water, waste water or sewage
• C01B 25/45 - Phosphates containing plural metal, or metal and ammonium
• C02F 101/16 - Nitrogen compounds, e.g. ammonia

Abstract

An ore sorting machine, comprising a material receiving member (1), a material guiding member (2), a first column wall (3), a second column wall (4), a third column wall (5), and a discharging member (6). The material guiding member (2) is arranged at the top end of the first column wall (3); the discharging member (6) is arranged below the first column wall (3); along the radial direction of a first circular truncated cone wall, the first column wall (3) is arranged on the inner side of the second column wall (4) and the third column wall (5), and the second column wall (4) is arranged on the inner side of the third column wall (5); a detection area is arranged between the first column wall (3) and the second column wall (4), a discharging area is arranged between the first column wall (3) and the third column wall (5), a second feeding port of the discharging member (6) is connected to the discharging area, and the discharging member (6) is located in the third column wall (5); a first detector (7), a second detector (8) and a blowing member (9) of the ore sorting machine are sequentially arranged on the end faces of different partition plates along the direction of the receipt axis of the first circular truncated cone wall. Ore enters the material receiving member (1) and then falls to the material guiding member (2), and the ore is cushioned and dispersed by the material guiding member (2) and then sequentially undergoes detection by the first detector (7) and the second detector (8), thereby avoiding missing detection of ore, and facilitating use.

IPC Classes  ?

• B07C 5/36 - Sorting apparatus characterised by the means used for distribution
• B07C 5/34 - Sorting according to other particular properties

Abstract

333 in the finally obtained tungsten concentrate is larger than 30%, and the recovery rate is close to 60%.

IPC Classes  ?

• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03D 1/02 - Froth-flotation processes

Abstract

An ultra-coarse tungsten powder and an ultra-coarse tungsten carbide powder, and a preparation method therefor. The preparation method comprises: molding tungsten oxide to obtain a tungsten oxide blank; heating and melting the tungsten oxide blank, and dropwise adding the melt into water for quenching to obtain reconstructed tungsten oxide; crushing the reconstructed tungsten oxide to obtain reconstructed tungsten oxide particles; and in a reducing atmosphere, carrying out a reduction reaction on the reconstructed tungsten oxide particles to obtain the ultra-coarse tungsten powder. Tungsten oxide crystal reconstruction is caused by quenching, and the obtained reconstructed tungsten oxide crystal particles are coarse and have large compactness and brittleness; after the ultra-coarse crystal particles having a uniform particle size are obtained by crushing, the ultra-coarse tungsten powder is obtained by utilizing the crystal heredity of the reconstructed tungsten oxide in the reducing atmosphere; and the preparation method is simple and low in cost.

IPC Classes  ?

• B22F 9/22 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
• C01B 32/949 - Tungsten or molybdenum carbides

Abstract

The present invention relates to the technical field of metallurgy, and provides a method for recovering lithium in a positive electrode material for a lithium-ion electrode. According to the present invention, solid carbon is used as a reducing agent, and no other chemical reagent is added, such that the introduction of other impurities is avoided, a lithium extraction procedure is shortened, and the recovery rate and the purity of lithium are improved. Lithium extraction by means of water leaching is directly performed on a reductively roasted material, such that the loss of lithium in a process of recovering nickel, cobalt, and manganese is avoided, and the recovery rate of lithium is improved. Moreover, negative-pressure evaporative crystallization can quickly remove moisture in a lithium-containing leachate, improve the crystallization efficiency of lithium, avoid the reaction between carbon dioxide in air and lithium hydroxide, and ensure the purity of a subsequent lithium product. In addition, lithium extraction by means of water leaching is performed on the reductively roasted material, such that the leaching of other elements, such as nickel, cobalt, and manganese, can be effectively avoided, thus ensuring the purity of the subsequent lithium product. Therefore, in the method of the present invention, the recovery rate of lithium is high, and the purity of lithium is high. In addition, the lithium extraction by means of water leaching in the recovery method of the present invention avoids the consumption of acid and alkali, thereby effectively reducing the cost.

IPC Classes  ?

• C22B 1/02 - Roasting processes
• H01M 10/54 - Reclaiming serviceable parts of waste accumulators

Abstract

A manufacturing method for and a use of a complete man-made bottom plate. Flow guide holes do not need to be formed on the complete man-made bottom plate, and a rare earth mother liquor can be drawn out by means of a tunnel and an in-road. Waterproof cloth is laid on the bottom parts of a main tunnel and an in-road, the waterproof cloth is formed as a whole at the bottom part of an ore body, thus preventing the problems of rare earth mother liquor leakage and excess ammonia nitrogen in groundwater. The complete man-made bottom plate can be applied in an in-situ ore leaching process on ionic rare earth ore, can greatly improve the recovery rate of rare earth, prevent environmental pollution, and improve the economic benefits of mining businesses.

IPC Classes  ?

• C22B 3/02 - Apparatus therefor
• C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
• C22B 59/00 - Obtaining rare earth metals

Abstract

2xx can be inhibited; the content of carbon in tungsten carbide can be accurately controlled by means of a one-step carburizing reaction, thereby achieving stable control of the carbon content in tungsten carbide. The method is short in a process flow, and the grain size of the obtained ultrafine tungsten carbide powder is less than or equal to 400 nm.

IPC Classes  ?

• C01B 32/949 - Tungsten or molybdenum carbides
• C01G 41/00 - Compounds of tungsten
• C22C 29/08 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
• B82Y 40/00 - Manufacture or treatment of nanostructures

Abstract

The present invention relates to the technical field of ore dressing, and provides a pre-selecting and waste-discarding method for non-ferrous metal ores. According to the present invention, the method comprises: firstly, carrying out crushing and primary screening and classification to obtain a first coarse ore, a first fine ore and a first qualified ore; subjecting the first coarse ore to pre-selecting and waste discarding by means of intelligent ore sorting to remove gangue tailings therein; crushing a remaining first rough concentrate and then subjecting same to secondary screening and classification to obtain a second fine ore and a second qualified ore; and finally, subjecting the first fine ore and the second fine ore to pre-selecting and waste discarding by means of heavy-medium separation to further remove gangue tailings therein, wherein the concentrate obtained by means of the heavy-medium separation is a qualified ore. In addition, the intelligent ore sorting or the heavy-medium separation may be further used alone for pre-selecting and waste-discarding in the present invention, making process steps simpler. The method provided in the present invention has a high automation degree, high ore dressing accuracy, a high non-ferrous metal ore recovery rate, a high waste discarding rate and no limitation on the types of ores, and is widely applicable.

IPC Classes  ?

• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage

Abstract

Disclosed in the present invention is an open stope mining method for a steeply inclined veined ore body. The method comprises: arranging a stope along an ore body; providing a plurality of rock drilling roadways, the plurality of rock drilling roadways being arranged along veins in parallel and spaced apart from each other in the vertical direction of the stope; providing a preliminary mining well in the middle of the stope, both the width of the rock drilling roadway and the width of the preliminary mining well being consistent with the mining width of the stope; and reserving a top column and an inter-column in the stope, and the rock drilling roadways and the preliminary mining well being used as blasting free faces to realize multi-free-face blasting of the ore body in a bord, thereby realizing entire region caving. In the mining method of the present invention, mining operations are performed in a rock drilling roadway, and the rock drilling roadway has a good stability, and is safe and reliable, so that rib spalling and roof falling of surrounding rock of a stope can be avoided, the operation environment is improved, and the operation safety coefficient is increased; and the rock drilling roadway and a preliminary mining well are used as blasting free faces, a multi-free-face blasting region integrally caves, and the blasting of the entire stope is completed in one go, so that the production capacity of the stope is greatly increased.

IPC Classes  ?

• E21C 41/18 - Methods of underground miningLayouts therefor for brown or hard coal
• E21D 9/14 - Layout of tunnels or galleriesConstructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings

Abstract

Disclosed in the present invention is an intelligent cleaning apparatus for scale in a bucket-tipping-type mine car. The apparatus comprises a scale thickness measurement module, a high-pressure water spraying module and a control module. The scale thickness measurement module comprises a distance measurement apparatus and a data processing unit, wherein the distance measurement apparatus is used for measuring the distance between the distance measurement apparatus and an area to be cleaned in a tipping bucket of a bucket-tipping-type mine car, and the data processing unit is used for calculating a scale thickness of said area according to a standard distance between the distance measurement apparatus and said area and a distance measured by the distance measurement apparatus, and identifying the position of said area on the basis of image technology, the standard distance being the distance between the distance measurement apparatus and said area when there is no scale in said area. The control module adjusts a water spraying position and a water spraying intensity of the high-pressure water spraying module according to the position and the scale thickness of said area, such that the intelligent cleaning of scale in the mine car is realized.

IPC Classes  ?

• B60S 3/04 - Vehicle cleaning apparatus not integral with vehicles for exteriors of land vehicles
• B60S 3/00 - Vehicle cleaning apparatus not integral with vehicles
• B08B 3/02 - Cleaning by the force of jets or sprays

Abstract

A method for regenerating a ternary precursor by using a nickel-cobalt-manganese residue, comprising: mixing a nickel-cobalt-manganese residue, water, and a reducing agent, adjusting the obtained mixed solution to alkaline, and then mixing same with an ammonium salt to obtain a mixed slurry; and carrying out a hydrothermal reaction on the mixed slurry to obtain a ternary precursor. The nickel-cobalt-manganese residue and the reducing agent are mixed for a hydrothermal reaction; under the action of the reducing agent, a metal oxide in the nickel-cobalt-manganese residue is reduced to a corresponding +2-valent metal hydroxide or carbonate; the morphology and particle size of the product are controlled by adjusting the pH value, adding an ammonium salt, and controlling the hydrothermal reaction temperature; finally, the obtained product can restore the morphology and electrochemical performance of the original ternary precursor. The method for regenerating a ternary precursor by using a nickel-cobalt-manganese residue allows for direct reduction of a nickel-cobalt-manganese residue into a ternary precursor, can implement recycling of waste ternary positive electrode materials, and has a great application prospect.

IPC Classes  ?

• C01G 53/00 - Compounds of nickel
• H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries