14results about How to "Shorten roasting time" patented technology

The invention belongs to the technical field of preparation of a silicon fertilizer from coal gangue, and particularly relates to a silicon fertilizer preparation method for improving the effective silicon conversion rate of coal gangue and reducing energy consumption. The invention aims to solve the problems of low silicon resource utilization rate and high energy consumption in the prior art. The preparation method comprises the following steps: (1) crushing coal gangue, sieving and drying for later use; (2) adding a specific auxiliary agent and coal gangue according to a certain proportion, and fully mixing; (3) roasting the mixture at a certain temperature for a certain time; and (4) cooling the roasted product to obtain the silicon fertilizer. The silicon dioxide in the coal gangue can be effectively converted into silicate which can be conveniently absorbed and utilized by plants, the yield of the silicon fertilizer is increased, the environmental problem caused by accumulation of the coal gangue can be solved, the silicon fertilizer can also be used as a soil improvement material, good economic benefits and social benefits are achieved, and a solid foundation is laid for wide utilization of the coal gangue. Compared with a traditional method, the method has obvious economic and environmental benefits.

A method for preparing ferrochrome through chromium slag suspension roasting pre-reduction-electric furnace smelting belongs to the field of mineral processing, and comprises the following steps: crushing chromium slag, and preheating to obtain a preheated material; the preheated materials are fed into a suspension roasting furnace, N2 gas is introduced into a furnace body, and the materials in a system are dehydrated under the action of high temperature; h2 and N2 are introduced into the suspension roasting furnace, the materials are in a suspension state under the action of ascending air flow, roasted product roasted sand is obtained and directly fed into the electric furnace through a pipeline for melting separation, ferrochrome obtained after melting separation of the electric furnace enters a cooling tower to be cooled and then is stored in a storage bin, and tailings enter a slag pool to be cooled and then are placed in a slag storage bin. The suspension magnetization roasting technology provided by the invention has the characteristic of large gas-solid contact area, the roasting time is greatly shortened, the roasting efficiency is improved, and the cost is reduced.

The present application relates to the field of energy-saving and environment-friendly production technology, in particular to a calcination method and system for flow-suspension roasting of petroleum coke. The method comprises: feeding petroleum coke raw materials into a multi-stage preheating system for countercurrent preheating; after preheating, the materials enter a flow-suspension roasting furnace to form a suspension state in a high-temperature airflow for rapid roasting; after roasting, the materials are separated from the flue gas, the separated flue gas containing volatile components is combusted in a combustion furnace and then subjected to purification treatment, and the heat is partially recycled; the separated high-temperature calcined coke is cooled through an air cooling and water cooling system and the heat is recovered, and the hot air generated by air cooling is recycled to the roasting furnace. The present application uses fluidization technology to shorten the roasting time to seconds, significantly improving the production efficiency; through multi-stage countercurrent heat exchange, flue gas combustion and heat recycling, the present application realizes heat cascade utilization and precise atmosphere control, greatly reduces energy consumption and oxidation loss, and stably controls the volatile component of the product below 1%, with high yield and uniform quality.

The present application belongs to the technical field of investment casting, and particularly relates to a manufacturing process of a impeller shell. The manufacturing process of the impeller shell comprises the following steps: 1) preparing a wax mold; 2) preparing a surface layer shell; 3) preparing a back layer shell; 4) sealing the shell with slurry; 5) dewaxing; and 6) baking. The manufacturing process of the impeller shell has the characteristics of short production cycle, low production cost, good shell removal, high finished product rate and the like, and improves the casting quality of the castings containing the impeller with a runner width less than 4 mm in the production of the casting industry.

The invention provides a sulfating roasting smelting process of lepidolite, and relates to the technical field of mineral processing. A sulfating roasting smelting process of lepidolite comprises the following steps that S1, low-temperature oxidizing roasting is conducted, specifically, the lepidolite and concentrated sulfuric acid are evenly mixed, and a mixed material A is obtained through low-temperature oxidizing roasting; s2, high-temperature reduction roasting: crushing the mixed material A, adding an auxiliary agent and a wave-absorbing agent, uniformly mixing, and performing high-temperature reduction roasting to obtain a mixed material B; s3, water leaching: carrying out water leaching reaction on the mixed material B, and filtering to obtain lithium slag and brine; s4, concentrating and cooling: concentrating and cooling the brine to obtain concentrated brine and potassium sulfate; s5, impurity removal: removing impurities from the concentrated brine, and filtering to obtain purified liquid; s6, lithium precipitation: adding sodium carbonate into the purified liquid to obtain lithium carbonate and lithium precipitation mother liquid; and S7, extraction and reverse extraction: performing multi-stage extraction and reverse extraction on the lithium precipitation mother liquor to obtain rubidium cesium salt. The smelting process provided by the invention is low in energy consumption and high in product yield.

The present invention relates to the field of suspension roasting technology, specifically a suspension roasting device for multiple varieties of alumina, comprising a roasting equipment frame and a roasting kettle mounted on the roasting equipment frame; the roasting kettle comprises a high-temperature heating machine, a high-temperature heat pump, a preheating chassis and a roasting chassis; an equipment platform is provided on the roasting kettle, the preheating chassis is mounted on the equipment platform, the roasting chassis is mounted on the preheating chassis, the bottom of the roasting chassis extends into the inner cavity of the preheating chassis and is connected to the inner space of the preheating chassis; a high-temperature machine installation box is provided on the roasting equipment frame, the high-temperature heat pump is installed on the inner side of the discharge box, the input end of the high-temperature heat pump is connected to the heat source output end of the high-temperature heating machine, and the heat source output end of the high-temperature heat pump is connected to the bottom of the roasting chassis. The present invention realizes flexible distribution and efficient utilization of thermal energy by independently setting up a preheating heating system, and realizes accurate measurement and real-time monitoring of the operating temperature of suspension roasting.

The invention provides a method for recovering cobalt from cobalt-containing tungsten carbide waste, and belongs to the technical field of smelting recovery. According to the method, cobalt-containing tungsten carbide waste powder and sulfuric acid are roasted under the protective atmosphere, cobalt forms water-soluble cobalt sulfate, tungsten carbide does not react, a tungsten carbide phase is still kept, and loss is avoided; the situation that tungsten carbide, oxygen and cobalt react in the air atmosphere or the oxygen atmosphere to generate cobalt tungstate can be avoided, and therefore the loss of tungsten and cobalt is reduced. According to the method, microwave roasting is adopted, compared with a conventional wet-process acid-adding leaching process, the microwave roasting reaction temperature is higher, cobalt in the cobalt-containing tungsten carbide waste can be promoted to fully react with acid to generate cobalt sulfate, the temperature is increased from inside to outside, the roasting temperature is reduced, and the roasting time is shortened; the interior and the surface of the cobalt-containing tungsten carbide waste are uniformly heated through microwave roasting, the roasting temperature is reduced, and surface sulfuric acid decomposition caused by uneven heating is avoided.

A pressurized fluidized bed roasting system is disclosed, comprising a fluidized bed furnace tube and a pressurized roasting device. The fluidized bed furnace tube has a first fluidized gas inlet at its lower end and a first fluidized gas outlet at its upper end. The pressurized roasting device is arranged parallel to the fluidized bed furnace tube, and an opening communicating with the inner cavity of the pressurized roasting device is formed on the inner wall of the fluidized bed furnace tube, with a movable baffle at the opening. The pressurized roasting device has a second fluidized gas inlet at its lower end and a second fluidized gas outlet at its upper end. The pressurization method of the pressurized roasting device is to increase the gas flow rate or change the device volume. This pressurized fluidized bed roasting system provides preheating of materials in the fluidized bed furnace tube before feeding them into the pressurized roasting tube for pressurized roasting, shortening the roasting time, improving roasting efficiency and resource utilization, and solving the problem of long roasting times in conventional fluidized bed roasting processes.

The utility model discloses a comprehensive recovery system for valuable elements in metallurgical dust and mud, which solves the problems that in the prior art, blast furnace cloth bag ash and sintering machine head ash are difficult to directly recycle, the comprehensive utilization value is low, secondary pollution is generated in the treatment process and the like. Separation, recovery and utilization of valuable elements in the blast furnace cloth bag ash and the sintering machine head ash are achieved, the process is flexible, the raw material adaptability is high, secondary solid waste is not generated, and waste water is not discharged.

The application provides a process for smelting manganese-rich slag from magnetized roasted manganese ore, and belongs to the technical field of manganese-rich slag production. The process comprises a preheater, a rotary kiln, a cooler and a blast furnace smelting process. After the manganese ore is magnetized and roasted in the rotary kiln, the cooled and magnetically separated and proportioned material is sent into the blast furnace for smelting, fire enrichment, separation and extraction to produce the manganese-rich slag. The application changes the production process, and performs hot melting roasting on low-grade polymetallic symbiotic and associated difficult-to-select primary lean manganese ore to produce the manganese-rich slag through fire enrichment, separation and extraction.

The invention discloses a regeneration method for lithium battery waste, belongs to the technical field of waste battery regeneration, and mainly relates to a hydrogen reduction roasting method for lithium battery waste, including three-stage reduction roasting; the temperature of the first stage reduction roasting is 450±20℃, the hydrogen flow rate is 10‑15m 3 / h tons of material, the reduction roasting time is 10-20min, the second stage reduction roasting temperature is 530±40℃, and the hydrogen flow rate is 20-30m 3 / h tons of material, the reduction roasting time is 10-40min, the temperature of the third stage reduction roasting is 620±30℃, and the hydrogen flow rate is 25-30m 3 / h tons of material, and the reduction roasting time is 10-30min. After the roasting product is leached, the leachate is further treated to remove impurities and precipitate lithium to prepare a lithium salt product, and the leached residue is subsequently treated to separate and recover nickel and / or cobalt and manganese. The method of the present invention can achieve simple and efficient separation of valuable elements in lithium battery waste.

A device and method for selective reduction and stepwise smelting of limonite laterite nickel ore to produce nickel-cobalt alloy and molten iron belong to the field of mineral processing and metallurgical technology. The device includes a silo, a screw feeder, a multi-stage cyclone preheating and drying system, a flue gas dust removal system, a fluidized bed roasting main furnace heating system, a first cyclone separator, a fluidized bed reduction reactor, a second cyclone separator, a first electric furnace smelting reactor, and a second electric furnace smelting reactor. The method steps are as follows: limonite laterite nickel ore is placed in the silo; it is fed into the multi-stage cyclone preheating and drying system, preheated, and then enters the roasting main furnace for heating, dehydration, and decomposition to form dried material; after gas-solid separation, the solid material enters the reduction reactor, and the high-temperature flue gas is returned to the system for preheating and drying; nitrogen and reducing gas are introduced into the inlet of the reduction reactor respectively, forming reduced material that flows out from the outlet; the solid material after gas-solid separation enters the smelting reactor, and excess gas is burned for heating; the iron-rich slag is melted and reduced, and then discharged after smelting.

The invention discloses a preparation method of a strip-shaped composite metal oxide hydrogen peroxide decomposition catalyst suitable for industrial production. The preparation method comprises a carrier preparation process and a carrier impregnation process, the preparation process of the carrier comprises the following five units: intense mixing of raw materials, rolling into blocks, extrusion molding, air-drying and curing, and high-temperature roasting. Wherein the strong mixing of the raw materials is performed by using a drum-type strong mixing machine containing a rotor; the carrier impregnation process comprises five units, namely, drum impregnation, high-temperature drying, high-temperature roasting, rolling granulation and vibration sieve powder removal. The catalyst has the advantages of good dry powder raw material and liquid raw material mixing effect, less nitrogen oxide emission, high carrier strength and longer catalyst life.

The invention provides a method for extracting aluminum oxide by treating fly ash through a nitric acid method, and belongs to the technical field of non-ferrous metallurgy. According to the method for extracting the aluminum oxide by treating the fly ash through the nitric acid method, external voltage is applied during acid leaching, ions in nitric acid are promoted to migrate, the electron obtaining capacity of hydrogen ions is improved, the reaction with the aluminum oxide can be accelerated, the dissolution process is promoted, and therefore leaching of the aluminum oxide at the temperature of 60-100 DEG C under the normal pressure is achieved; the production safety is improved; by adopting fluidized roasting, the mineral activity is improved, the roasting time is shortened to the second level, the energy consumption is reduced, and the production efficiency is improved.