603results about "Calcium carbide" patented technology

Use of physical vapor deposition methodologies to deposit nanoscale gold on activating support media makes the use of catalytically active gold dramatically easier and opens the door to significant improvements associated with developing, making, and using gold-based, catalytic systems. The present invention, therefore, relates to novel features, ingredients, and formulations of gold-based, heterogeneous catalyst systems generally comprising nanoscale gold deposited onto a nanoporous support.

The invention relates to a technique for producing calcium carbide and cogeneration by a two-stage method and a device thereof. The technique comprises the following steps: after being preheated at a shaft furnace at the upper section, massive carbonous raw material and massive calcic raw material enter an arc furnace at the lower section; while blowing oxygen and coal powder and supplying heat by the electrode in the arc furnace, the raw materials react to produce calcium carbide; and the produced calcium carbide furnace gas is dedusted and combusted by a gas turbine so as to drive the generator to generate power, and sensible heat of exhaust gas is recycled by an exhaust-heat boiler, thereby centrally supplying heat to cities and towns. The invention has the advantages of capability of continuous production, high yield, low investment, low energy consumption, high calcium carbide grade, energy saving, high efficiency and investment saving, and realizes coordinated development of economy, environment and energy sources.

The invention discloses a method for preparing solid calcium carbide. The method comprises the following steps: (1), finely grinding a carbon material and a calcareous material so as to respectively obtain a carbon material powder and a calcareous material powder; (2), mixing and then wet-grinding a mixture containing the carbon material powder and the calcareous material powder, and a bonding agent so as to obtain a mixed material; (3), performing molding on the mixed material so as to obtain material balls; (4), successively distributing the material balls in a rotary hearth furnace, successively pyrolyzing the material balls in a pyrolysis furnace chamber of a radiant tube with the rotation of the bottom of the rotary hearth furnace, and smelting the pyrolyzed material balls in the chamber of a smelting furnace under a temperature of 1200-1380 DEG C, so as to finally obtain solid calcium carbide, coal gas and coal tar. The method disclosed by the invention can be used for preparing solid calcium carbide, the coal gas and the coal tar at the same time, and the production cost of the calcium carbide is obviously lowered.

Heterogeneous catalyst systems, methods of making these systems, and methods of using these systems, wherein catalytically active gold is deposited onto composite support media. The composite support media is formed by providing nanoporous material on at least a portion of the surfaces of carbonaceous host material. In representative embodiments, relatively fine, nanoporous guest particles are coated or otherwise provided on surfaces of relatively coarser activated carbon particles. Catalytically active gold may be deposited onto one or both of the guest or host materials either before or after the guest and host materials are combined to from the composite host material. PVD is the preferred catalyst system of depositing gold.

The invention discloses a method for preparing calcium carbide, which comprises the following steps: providing carbon-base particles and calcium-base particles, wherein the average particle size of the carbon-base particles and calcium-base particles is not greater than 5 millimeters, and the water content is lower than 5%; mixing the carbon-base particles and calcium-base particles to obtain a mixture; pyrolyzing the mixture to obtain high-quality tar, high heating value gas and a pyrolytic solid product, wherein the pyrolytic solid product contains quicklime and one of coke, semicoke and carbon black; and feeding the pyrolytic solid product into a gas smelting furnace at the temperature of not lower than 450 DEG C to perform smelting in the gas smelting furnace, thereby obtaining the calcium carbide. Thus, the method can further enhance the heat utilization ratio and production efficiency, lower the production cost and reduce the energy consumption and pollution.

A calcium carbide production system belongs to the field of calcium carbide production. The calcium carbide production system includes a raw material preheating unit and a reaction unit; the raw material preheating unit includes a raw material mixing and feeding device, a preheating device, a gas compression device and a heat exchanger; the raw material mixing and feeding device includes a solid raw material mixer and a feeder; a raw material inlet, a gas inlet, a gas outlet and a solid material outlet are formed on the preheating device; the raw material mixing and feeding device is communicated with the preheating device; the reaction unit includes a feeding device, a reactor and a heat exchanger; a raw material nozzle, a gas outlet and a product outlet are arranged on the reactor; the solid material inlet of the feeding device is communicated with the preheating device; the solid material outlet of the feeding device is communicated with the raw material nozzle on the reactor; the reactor is communicated with the heat exchanger; and the heat exchanger is connected with the gas compression device of the preheating unit. The system realizes the coupling of the process of coal coking and lime calcining and the production of calcium carbide; the capacity usage ratio is high; the powdery material is adopted; the selection range of the raw material is wide; the production capacity is large; and the furnace type is simple.

The invention relates to a production method of calcium carbide, which takes coal powder and calcium oxide as raw materials. According to the method, the coal powder is crashed to 120 meshes, and then mixed with the calcium oxide at the weight rate of 1:0.8 to 1. A certain amount of water is added into the mixture which then can be stirred to be even and compressed into cubic honeycomb blocks; and then the cubic honeycomb blocks are sent into an electric-arc furnace for smelting the calcium carbide after airing water. The invention crashes the coal powder into a nanometer particle size, thereby ensuring the cubic honeycomb blocks to have a comparatively large surface area, improving the reaction activation energy and being good for the rapid generation of the calcium carbide. The production method of the calcium carbide of the invention not only reduces reaction temperature and shortens reaction time, but also extends the service life of the electric arc furnace.

The invention relates to field of preparing calcium carbide with oxygen jetting in tower furnace. The calcium carbonate is heat decomposed into calcium oxide and reduced to calcium carbide by carbon material by jetting with preheating oxygen or oxygen-enriched air. The device comprises: tower furnace and systems of feeding, charging, oxygen producing, heating air, blasting air, oxygen enriching, jetting, cooling, cleaning and recoverying coal gas and recovering calcium carbide and ferrosilicon. The ration between said furnace height and furnace hearth diameter is less than or equal to 3.5, and diameter ratio between furnace hearth and furnace hearth is 0.8-1.1. The invention is to produce calcium carbide of 80%, the proportioning of raw material is lime carbonate: coke: fluorite =(1.2-2.0): (1.5-4.0): (0.039-0.046); jetting material is coal powder, light oil or natural gas; relative oxygen-enriched air amount, the xygen-enriched rate is 9-39%, and prepares side products of calcium carbide of more than 65%, ferrosilicon more than or equal to 54% and carbon monoxide of more than or equal to 54% at high temperature. The invention is characterized by energy saving, high quality and environmental protection.

A method and a system for producing calcium carbide, the method including mixing powdery carbon-containing raw material with powdery calcium-containing raw material, and directly heating the mixture by combusting a part of carbon-containing raw material in an oxygen-containing atmosphere to produce calcium carbide. The carbon-containing raw material can be coal, semi-coke or coke, the calcium-containing raw material can be calcium carbonate, calcium oxide, calcium hydroxide or carbide slag. The system includes a raw material preheating unit, such as a fluidized bed or an entrained flow bed, and a reaction unit such as an entrained flow bed. By combustion of the by-product CO produced during the production of calcium carbide or auxiliary fuel in the air to preheat the raw materials to 500-1500° C., the carbon consumption and the oxygen consumption for the calcium carbide production can be reduced, and thus process energy consumption is further reduced.

The invention relates to a calcium carbide furnace with combination of an oxygen heating method and an electric heating method, which adopts the structure of an electric-arc furnace, and comprises a furnace body, a furnace cover, a feed inlet and a calcium carbide furnace gas outlet, wherein 1-5 electrode assemblies are arranged on the calcium carbide furnace and penetrate the furnace cover to be inserted into the furnace body; each electrode assembly is of a sleeve structure, and comprises an inner sleeve and an outer sleeve; an electrode is accommodated in each inner sleeve; a conduction oil jacket is arranged between the inner sleeve and the outer sleeve of each electrode assembly; a fuel spray pipe, an oxygen spray pipe and a calcium carbide extraction pipe are arranged in each electrode; a conduction oil inlet and a conduction oil outlet are arranged on each conduction oil jacket, and are connected with a conduction oil circulation system. According to the calcium carbide furnace, the oxygen heating method and the electric heating method are combined, so that the electric consumption of calcium carbide production is lowered, the cost is saved, the quality of a calcium carbide product is ensured, and the economic efficiency of an enterprise is improved.

The invention discloses a method for preparing calcium carbide, which comprises the following steps: respectively crushing a carbon-base raw material and a calcium-base raw material to obtain carbon-base particles and calcium-base particles of which the average particle sizes are not greater than 50 micrometers; mixing the carbon-base particles and calcium-base particles to obtain a mixture; forming the mixture to obtain a massive furnace raw material; and smelting the massive furnace raw material in an arc furnace to obtain the calcium carbide. Since the raw materials are prepared into the ultrafine powders and then mixed and formed, the method disclosed by the embodiment of the invention can effectively lower the smelting temperature and energy consumption of the calcium carbide.

The invention relates to a waste heat collecting and recycling method in the solidification course of liquid calcium carbide, which comprises the following steps: the liquid calcium carbide which is emitted from the mouth of a calcium carbide furnace flows into calcium carbide pots which are placed on an annular transportation trolley one by one; the annular transportation trolley loaded with the calcium carbide pots passes through a calcium carbide waste heat collecting box and calcium carbide exchanges heat with water; and the generated hot water is transmitted to a water storage tank through a water discharge pipeline and finally transmitted to a user pipe network through the pipeline. The method provided by the invention realizes recycle of the waste heat in the production course of the calcium carbide and has the obvious effects of saving the energy sources, lowering the production cost, improving the production environment, realizing clean production.

A method for simultaneously producing calcium carbide, ferrosilicon and high-purity CO gas is characterized in that: an oxygen heating process is adopted, a calcareous material, a carbon material and steel scrap or a ferrous waste are taken as raw materials, self-produced CO gas is taken as a fuel. The method has obvious advantages of no greenhouse gases emission, reasonable process combination, simple process flow, low consumption of energy and water, high efficiency and low cost.

The invention relates to a method for preparing boron carbon zirconium materials by liquid phase method, which belongs to the field of structural ceramics. By using carbothermal reduction as the basic principle and adopting zirconium oxychloride, boric acid and phenolic resin as the main materials, the method comprises the steps as follows: the phenolic resin is mixed with zirconia sol which is formed by titration of ammonia; then gel is formed by the titration of the ammonia; finally ball milling is carried out; after drying, screening and heat treatment, the ultrafine boron carbon zirconium materials can be obtained. The boron carbon zirconium materials which are prepared by the invention, with product granularity smaller than 200nm and excellent molding and sintering performance, can be applied to fields such as electron materials and refractory materials.

The invention relates to a method for producing sulfuric acid and co-producing calcium carbide by phosphogypsum, and belongs to the technical field of environmental protection. According to the method, phosphogypsum is subjected to a water washing and purification pretreatment by a multi-stage cyclone; then the pretreated phosphogypsum is dried and dewatered; the dewatered phosphogypsum enters a multi-stage suspension heat exchanger to carry out preheating; the hot state gypsum enters a circulating fluidized bed decomposing furnace, then primary air and secondary air are respectively introduced to carry out decompositions; high temperature sulfur dioxide-containing flue gas discharged from the top of the circulating fluidized bed decomposing furnace enters the multi-stage suspension heat exchanger to carry out heat exchanging and cooling with the cold state gypsum; dust in the cooled hot flue gas is removed by a multi-stage dust removing device; the dust-removed flue gas enters an acid washing and purification system to further remove the dust and the gaseous impurities in the flue gas; the purified and cleaned flue gas is conveyed into an acid preparation system to produce the sulfuric acid product; the hot state calcium oxide discharged from the bottom of the circulating fluidized bed decomposing furnace is cooled, and conveyed into a sealed calcium carbide furnace to carry out an electrical arc reaction with a carbon material to generate the calcium carbide product; the high temperature furnace gas discharged from the top of the sealed calcium carbide furnace is directly conveyed into the decomposing furnace, wherein the high temperature furnace gas is adopted as a fuel and a reducing agent. The method of the present invention has good environmental protection benefits and strong economic advantages.

A re-utilizing treatment of calcium carbide furnace tail gas is carried out by preparing synthetic ammonia, desulfurizing, denitrifying and obtaining ammonia sulfate by-product. Its advantages include low cost, simple process, no secondary-environmental pollution and waste circulating utilization.

The invention discloses a method for preparing calcium carbide, which comprises the following steps: drying a carbon-base raw material to obtain a dried carbon-base raw material; respectively crushing the dried carbon-base raw material and a calcium-base raw material to obtain a carbon-base powder and a calcium-base powder; mixing the carbon-base powder and calcium-base powder to obtain a mixture; pyrolyzing the mixture to obtain high heating value synthetic gas, tar and a pyrolytic solid product, wherein the pyrolytic solid product contains coke, semicoke, carbon black and quicklime; and feeding the pyrolytic solid product into a gas smelting furnace at the temperature of not lower than 450 DEG C to perform smelting in the gas smelting furnace, thereby obtaining the calcium carbide. The method can obviously lower the smelting energy consumption and production cost, and further enhances the preparation efficiency and quality of the calcium carbide.

The invention discloses a method of utilizing microwave energy to prepare calcium carbide at low temperature. The method comprises the following steps of using coal as a carbon source, using limestone or lime as a calcium source, heating by the microwave energy, and reacting and synthesizing to form the calcium carbide, wherein the reaction temperature of the synthesized calcium carbide is 1300-2000 DEG C, the reaction pressure is 0.3-1.1atm, and the reaction time is 3-120min; primarily grinding the carbon source and the calcium source, mixing according to a ratio, and performing ultrafine treatment to obtain an ultrafine mixed material; heating to react and synthesizing to form the calcium carbide by utilizing the microwave energy. The method has the advantages that the coal and the limestone are directly used as the raw materials, are subjected to ultrafine crushing, and are heated and synthesized to form the calcium carbide by the microwave energy; by utilizing various coal types, two steps of the coking of raw coal and the high-temperature decomposing of the calcium carbonate to prepare the limestone are not needed, the synthesizing temperature of the calcium carbide is lowered, the production efficiency and mechanical degree of the calcium carbide are improved, and a byproduct of carbon monoxide can be used as a chemical raw material to produce other chemical products.

The invention relates to a production device for coproduction of calcium carbide by an electrothermal method and an oxygen thermal method. The production device comprises an oxygen thermal method calcium carbide furnace, an electrothermal method calcium carbide furnace, a semi-coke furnace, a lime kiln and a power generation system. A coal briquette preparation system is connected to the semi-coke furnace through a coal briquette preheater, and the semi-coke furnace is connected to the electrothermal method calcium carbide furnace and the oxygen thermal method calcium carbide furnace. A limestone supply device is connected to the lime kiln through a limestone preheater, and the lime kiln is connected to the electrothermal method calcium carbide furnace and the oxygen thermal method calcium carbide furnace. Calcium carbide furnace gas outlets of the calcium carbide furnaces are connected to a fuel inlet of the semi-coke furnace, a semi-coke tail gas outlet of the semi-coke furnace is connected to the fuel inlet of the lime kiln and the fuel inlet of a steam boiler, and a waste heat boiler is connected to a steam turbine. A power generator set is connected to the wiring end of the electrothermal method calcium carbide furnace through a power transmission device. The production device provided by the invention fully utilizes byproducts and waste heat of the calcium carbide furnaces and the semi-coke furnace, reduces the energy consumption and the calcium carbide production cost and improves the comprehensive economic benefits of an enterprise by combining the oxygen thermal method calcium carbide furnace and the electrothermal method calcium carbide furnace with the semi-coke furnace, the lime kiln and the power generation system.