2615 results about "Calcium carbide" patented technology

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 is a method of preparing high-whiteness degree nano CaCO3. It uses limestone, CaCO3 content>98%, whiteness degree>92% as raw material, washes to calcine into CaO, then adds in the cleaned hot water to get Ca(OH)2, prepares milk of lime by purifying, the concentration 2-10%, uses the cleaned flue gas of CaCO3, calcinations as CO2 source, makes the solution of milk of lime react with CO2 in special synthesis reactor, and adds in crystal-shaped controlling agent to control the time, temperature and stirring speed of the reaction, and after the reaction is finished, makes filtration, drying and depolymerization on the solution. The whole course adopts the technique of controlling whiteness degree.

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.

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.

The invention relates to a protection method for improving the salt expansion or the dissolution sink of salty soil, which is characterized in that calcium carbide ash, fly ash, zeolite and salty soil are adopted, are mixed and stirred according to the volume ratio of 1:1:1:9 and are used for the filler improvement of a road embankment, broken stone and gravel are adopted as a buffer layer, bitumen, geomembranes and geotextiles are adopted as a partition layer, a geogrid reinforcement improved filler is adopted, a sack filled with greening grass seeds, shrub seeds and improved soil is adopted to press the toe of a slope, and a side slope adopts the protection of the companion planting of grass and shrub and the combination of a hanging net. The invention has the following advantages of: (1) adjusting measures to local conditions, making full use of the salty soil, saving resources, utilizing wastes, such as the fly ash and the like, and realizing the utilization of the wastes; (2) adopting a structural protection system formed by the improved salty soil and a geogrid together and solving the problems of stability and uniform settlement of a fill slope; and (3) combining the grass and the shrub, reaching the ecological requirement on one hand, solidifying a sloping surface on the other hand and preventing the water and soil loss and the salt expansion or the dissolution sink. The invention is suitable for the problem of engineering improvement of the salty soil in civil engineering and can be used for the engineering of the filling of a highway embankment, the protection of the side slope, the construction of a foundation, the improvement treatment of a foundation pit and the like.

The invention provides a method for producing a desulfurizing agent from carbide slag, which is classified as a dry process and a wet process according to the source of carbide slag; the carbide slag produced by dry acetylene production serves as raw material of the dry process; carbide slag slurry produced by wet acetylene production serves as raw material of the wet process; the dry process comprises the following steps of: 1) cyclone separation: removing heavy foreign matters from the carbide slag and carbide slag particles with fineness larger than 4mm; 2) raised dust filtration and separation at negative pressure: intercepting carbide slag particles with fineness larger than 0.04mm in a solid state at one time, and reducing the water content to less than 5%; 3) drying: controlling the water content to be between 1% and 3% to obtain dry powder of the desulfurizing agent; and (4) pulping: adding water accounting for 15%-30% of the final solid content and stirring evenly to obtain a liquid desulfurizer. The wet process comprises the following steps of: 1) sedimentation of washing sand: primarily removing large foreign matters and silicon iron particles from the carbide slag slurry; 2) selective filtration: removing solid particles with fineness larger than 0.04mm through controlling the thickness of a filter cake; 3) filtration and concentration: controlling solid content to be between 15% and 30% to obtain liquid desulfurizing agent; and 4) dewatering and drying: finally controlling the water content to be between 1% and 3% to obtain the desulfurizing agent.

The invention discloses a non-noble metal mercury-free catalyst for hydrochlorination of acetylene and a preparation method thereof. The catalyst mainly contains copper, chlorine, a carrier and the balance of catalysis-promoting metallic elements, wherein the copper exists in the form of copper chloride, the chlorine exists in the form of an inorganic salt of chlorine, the carrier is activated carbon or nitrided activated carbon which is subjected to acid cleaning, and the catalysis-promoting metallic elements are one of or a mixture of any of alkali metals, alkaline-earth metals and non-noble metals of which the chloride is non-volatile in transition metallic elements. The preparation method comprises the process steps of preparing impregnation motor liquor, adding a catalyst carrier to perform equivalent-volume impregnation, drying the mixture and the like. The non-noble metal mercury-free catalyst prepared by adopting the method is better in activity, high in selectivity, long in service life, low in cost and environment-friendly, and can be used for hydrochlorination of acetylene during the production of vinyl chloride by using a calcium carbide method.

The invention provides a mercury-free catalyst for an acetylene hydrochlorination reaction, a preparation method and application thereof, and relates to a catalyst for preparing chloroethylene by the acetylene hydrochlorination reaction, preparation and regeneration methods, and application thereof. The catalyst contains a bismuth element and a phosphor element, and the balance being an accelerative catalytic metal element and a carrier, wherein the bismuth element exists as oxide of bismuth, inorganic salt of bismuth or organic salt of bismuth; and the phosphor element exists as one or mixture of substances of inorganic acid containing phosphor, inorganic salt of phosphor and oxide containing the phosphor. The preparation method comprises preparation of an impregnating mother solution, addition of a catalyst carrier by incipient impregnation, drying and baking and other process steps. The catalyst prepared by the method has the advantages of good activity, high selectivity, high strength and regeneration capability, and can be used for the acetylene hydrocchlorination reaction for producing polyvinyl chloride by a calcium carbide process. The invention also provides the method for preparing chloroethylene by the catalyst and a regenerating method of the mercury-free catalyst.

The invention discloses an aluminum-containing cold forging steel smelting process, comprising the steps of blast furnace molten iron making, processing by a converter, refining and continuous casting, wherein requirements of molten iron are as follows: P is not more than 0.10%, Si is not more than 0.50% and not less than 0.30%, S is not more than 0.030%; requirements in converter refining are as follows: CaO is not less than 85%, activity degree is not less than 280 and SiO2 in fluorite is not more than 6%; low-Si pre-melted slag or refining agent replaces partial CaO and fluorite in a converter steel discharging process for rapid slag making, a refining furnace deoxidizing agent is applicable to slag deoxidization after stirring calcium carbide and aluminum particles, and Si-containing material is prohibited; during continuous casting, pure Ca lines are applicable between a medium packet impact zone and various flows, so that calcium aluminate which is low in melting point and is from reaction of Al2O3 generated from medium packet through secondary oxidation and Ca floats and is removed. The process can reduce the content of Si in steel, improve Al content and guarantee continuous pouring of molten steel.

The invention relates to waste acid and water processing equipment and a technique for processing acidic sewage generated in the process of purification of an acid making system. The technique comprises the following steps: pumping the waste acid into a first-level neutralizing reaction tank in the first stage; adding calcium carbide slag to adjust the pH value between 1 and 6; adding calcium carbide slag to adjust the pH value between 5 and 6, when the liquid overflows into a second-level neutralizing reaction tank in the first stage; carrying out solid-liquid separation; entering a sewage pool; pumping the liquid in the sewage pool into a first-level neutralizing reaction tank in the second stage; adding lime milk to adjust the pH value between 6 and 7; adding lime milk to adjust the pH value between 7 and 8, when the liquid gravitationally flows into a second-level neutralizing reaction tank in the second stage; adding 7% of sodium sulphide and 15% of ferrous sulfate according to weight percentage into a vulcanization and flocculation reaction tank, when the liquid gravitationally flows into the vulcanization and flocculation reaction tank; carrying out solid-liquid separation of fine particles on the liquid by a filter press and a film filter; discharging the liquid, thus the continuous up-to-standard discharging of effluent water is easily realized.

The invention belongs to the field of metallurgy and discloses a smelting process of Cr-Mn series spring steel. The smelting process of Cr-Mn series spring steel comprises the following steps: (1) by taking a low-sulfur molten iron and a high-quality steel scrap as the electric furnace smelting iron and steel materials, controlling the electric furnace end point carbon content to greater than 0.15%; (2) adding active lime and composite refining slag in the electric furnace tapping process, and adding calcium carbide to perform pre-deoxidation in the tapping process; (3) feeding an Al line in an argon station before LF refining; (4) producing high basicity white slag in the refining earlier stage and controlling the basicity of slag in the refining middle and later stages to 1.5-2.5; (5) controlling the ultimate vacuum front argon flow to 15-25 L/min and controlling the ultimate vacuum late argon flow to 30-45 L/min; (6) adding a granular alkaline covering agent and a carbonized rice hull to perform double protection by VD emptying; and (7) stabilizing the speed of continuous casting to 0.8-0.9 m/min, and controlling the degree of superheat to 20-30 DEG C. By adopting the process, the non-metallic inclusion content in the molten steel is reduced.

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 discloses a binder for coke powder molding and an application method thereof which belong to the field of coal. The binder of the invention comprises an A component and a B component, wherein the A component comprises adhesive, adhesion promoter and filling agent; and the B component is surface modifier. The binder of the invention is applicable in the cold bonding forming of coke powder (comprising blue carbon powder, petroleum coke), and finished products can serve as submerged arc furnace raw material, chemical gas raw material, calcium carbide production raw material and thelike, replace some coke and are applied. The application method of the binder of the invention has the advantages of simplicity, no need of raw material for heating and stirring, no need of product carbonization, no pollution in the whole production process, above 95 percent forming rate, more than 3 times of falling from 1m up of wet ball strength, more than 800N/ball finished product strength, 1,000DEG C high temperature resistance, and no dispersion and no powder.

The invention provides a method for increasing the molten steel finishing point manganese content by adding manganese ore outside a furnace, which comprises the steps of: setting the tapping temperature of the revolving furnace to be medium or upper limit according to the type of the made steel, adding the manganese ore and a little reducing agent, and controlling the finishing point carbon content and the slag thickness; adopting strong argon for stirring in a ladle furnace (LF), and replenishing aluminum particles and calcium carbide for making reducing slag according to the top slag condition; and reducing manganese oxide in the slag into metal manganese to realize manganese alloying. Compared with the prior art, the method has the advantages of being simple in technology, convenient to operate and control, short in smelting time, low in energy consumption and high in yield of manganese alloy, reducing pollution, prolonging the service life of a furnace liner and the like; and the yield of manganese in the manganese ore reaches more than 96.5%, so that the consumption of the manganese alloy is greatly reduced, and the steel-making cost is remarkably reduced. Meanwhile, the original equipment does not need to be reformed, and other production processes are not influenced, so that the investment is low, and the effect is rapid.

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 a gas transformation deep purifying technique for separating and purifying CO and H2 of a calcium carbide furnace. The gas transformation deep purifying technique comprises a pressurizing and deep dedusting system, a transforming system, a decarbonization and desulfurizing system, a deep purifying system, a pressure swing adsorption system, a dehydrogenation and dehydration system, and a deoxidizing, decarbonization and dehydration system. The assorted gas transformation deep purifying technique which is capable of realizing industrial scale and high purity is firstly provided for separating and purifying CO and H2, the problems about dust extraction of tail gas of the calcium carbide furnace, high-concentration CO transformation, various complicated-component impurities in the tail gas of the calcium carbide furnace, removal of low-concentration sulfur and the like are solved, the gas transformation deep purifying technique has the advantages of high CO and H2 yield, stability of operating of devices, high heat utilization rate, and industrial exhaust gas can be effectively recycled, energy is saved, and emission is reduced. The gas transformation deep purifying technique is applicable to the technical field of gas separation.

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.

The invention belongs to a steelmaking process in the metallurgy field and relates to a process for smelting aluminum containing steel through calcium carbide deoxidation without the aluminum deoxidation in the whole process. The process belongs to a production process that the converter steel tapping deoxidation system and the slagging system are optimized, aluminum wires are fed behind a converter, the aluminum in molten steel is regulated, the LF (ladle furnace) calcium carbide and aluminum wire deoxidation slagging is carried out, and in addition, the LF aluminum wire feeding is matched for finely regulating the aluminum in molten steel. The characteristics of calcium carbide and aluminum wires are utilized, and the diffusive deoxidation and the bulk deoxidation in the smelting process are fully and reasonably combined. The process has the advantages that the converter steel tapping deoxidation is stable, the LF slagging desulfurization effect is obvious, the casting blank quality is good, the flaw detection qualified rate of steel plates is high, the aluminum consumption of each ton of steel in the aluminum containing steel production is reduced by about 0.80kg, and the economic benefit of the aluminum containing steel production is greatly improved.