2799results about "Recycling and recovery technologies" patented technology

The invention relates to a method for recycling iron on line from iron-containing industrial slag and preparing a glass ceramics frit, belonging to the technical field of resource comprehensive utilization and material preparation and mainly comprising a two-step method process of iron-containing industrial slag online rough adjustment and modification for reducing iron and fine adjustment and modification for preparing the frit. The method comprises the steps of: discharging high-temperature iron-containing slag into a high-temperature furnace device, and simultaneously adding a reducing agent and a modifying agent to ensure that slag components are adjusted to reach the optimal component point in which iron oxide is reduced; after fully reacted, separating reduced molten iron from the slag, and recycling to obtain high-temperature molten iron; further adding a modifying agent and an adjusting agent into the slag remained after the separation to ensure that the slag components are adjusted to achieve the quality requirement of slag glass ceramics on the frit; and water-hardening, drying and grading the qualified slag to prepare the glass ceramics frit. The invention realizes multiple purposes that the heat of the slag is directly utilized and metal iron is recycled to prepare a high addition value product as well as solid wastes are massively utilized, and the like.

A gas recovery and reuse/recycle method is disclosed which can readily and economically recover valuable and/or environmentally hazardous gases from a manufacturing or chemical process and then return the gas to the process for reuse, and repeat this many times without significant contamination or degradation of the gas or the produced products. All gas transport, compression and storage equipment is designed and maintained so that it is non-contaminating to the process gas. Commonly the process gas will be a Group VIII gas, preferably He, Ne, Kr or Xe, or a gas which comprises a hazard to the ambient environment or beings therein, such as a carbon oxide gas, a halocarbon gas, an acid-precursor gas, a biologically hazardous gas, or a radioactive gas.

The invention provides a melting furnace slag quenching dry type granulation and sensible heat recovery generating system and a method using the same and belongs to the technical field of steel metallurgy furnace slag treatment and complementary energy recovery. The melting furnace slag quenching dry type granulation and sensible heat recovery generating system provided by the invention comprisesa slag-receiving device, a high-pressure water-air pulverization furnace slag quenching and granulating device, a furnace slag slow-cooling device, a sensible heat recovery generating device and a waste gas purification treatment device. According to the invention, the melting furnace slag is quenched and granulated by utilizing the high-pressure water-air pulverization device, so that the melting furnace slag is rapidly cooled to be in a glassy state; and then through a water-cooled type vibration grid plate, the melting furnace slag in the glassy state is further subjected to heat exchange with cold air so as to facilitate the subsequent recovery of the sensible heat. By the system provided by the invention, the melting furnace slag is quenched and granulated, and the high-temperature sensible heat resource of the furnace slag is sufficiently recovered and is used for generation on the basis that the water activity quality of the furnace slag is not influenced.

Improved methods for the extraction or dissolution of metals, metalloids or their oxides, especially lanthanides, actinides, uranium or their oxides, into supercritical solvents containing an extractant are disclosed. The disclosed embodiments specifically include enhancing the extraction or dissolution efficiency with ultrasound. The present methods allow the direct, efficient dissolution of UO2 or other uranium oxides without generating any waste stream or by-products.

Embodiments of the invention are directed to a rotor for a molten metal pump and a molten metal pump including the rotor. The rotor has a main body and a top comprised of a material that is at least twice as hard as the main body. The top, among other things, may form a first portion of each rotor blade wherein the first portion directs molten metal into a pump chamber or other structure in which the rotor is mounted.

A metal scrap submergence device comprising an open top chamber including walls of a heat resistant material, an inlet positioned in a side wall of the chamber, an outlet positioned in the base of said chamber, and a ramp adjacent said side wall of the chamber. The side wall further includes a feature affecting molten metal flow. The feature can include, for example, a baffle, a vane, a passage, a diverging or converging shape and combinations thereof. Similarly, the molten metal flow can be affected by slanting the ramp inwardly or outwardly.

The technological process of separating and extracting metal elements from V-Ti iron ore includes the steps of: agglomerating ore powder of mixing V-Ti iron ore powder, reductant, additives and adhesive, pressing the mixture into 10-25 mm diameter agglomerates and drying at 80-90 deg.c; reducing inside one bottom rotating furnace to obtain metal products; smelting the metal products in an electric furnace to obtain molten iron and V-Ti slag component, and smelting the V-Ti slag component to obtain V-Cr oxide and Ti slag as the material for producing titanium while. The present invention has high reduction temperature, fast reduction speed, short reduction time, high production efficiency, high metal and V-Ti recovering rate and less environmental pollution.

The invention relates to the field of energy recovery utilization and in particular to a molten blast furnace slag sensible heat recovery method and a device; the method is characterized in that: themolten blast furnace slag carries out a first heat recovery in a granulator, and then a second heat recovery is carried out by a vibrated bed, and then a third heat recovery is carried out in a fluidized bed, and the reclaimed heat energy is reutilized or converted in a hot air or power generating way; the realization steps are that: 1) the molten blast furnace slag is arranged in the granulator for granulation; 2) the blast furnace slag granules carry out heat exchange in the vibrated bed; 3) the blast furnace slag granules carry out heat exchange in the fluidized bed; 4) after heat exchangeis carried out, the heat is used for power generation from air or is directly utilized in a hot wind way. The method has the beneficial effects that: the sensible heat of the molten blast furnace slagis utilized respectively in a way of waste heat stream power generation and in a way of blast furnace hot wind, compared with the existing water quenching method, 1.0-1.2t of fresh water can be savedwhen processing 1t of molten slag, and sulfides H2S and SO2 are not produced, and energy equivalent to 47kg of standard coal is saved.

Systems, methods and devices are provided for transporting, tracking and managing waste or recyclable materials, which may include one or more devices for transporting waste or recyclable material. The device may comprise a base; and a collapsible sleeve movable between an open state and a collapsed state, wherein the collapsible sleeve in the open state interfaces in a nesting manner with the base to form a bin for receiving and transporting waste material.

The invention discloses a process method for cooperatively and continuously processing waste containing iron and/or zinc, lead, copper and tin, and the like and molten steel slag on line, separating and recycling metal such as iron, zinc, lead, copper and tin as well as molten slag. The cooperative processing and recycling method is characterized in that pellets prepared from waste containing iron, zinc, lead, copper, tin and the like, particles, a blocky material containing iron, zinc, lead, copper, tin and the like and high-temperature molten steel slag are added into a reducing, volatilizing and smelting furnace, molten iron, which is obtained by air-blowing, adding of fuels such as coal gangues and flux such as high silicon and high aluminum, high-temperature reducing and volatilizingtreatment, is discharged from an iron outlet of the reducing, volatilizing and smelting furnace; volatilized substances such as zinc and lead and smoke gas are sucked into a dust collector for being collected and utilized; enriched metal such as gold, silver, copper, tin and lead is discharged from a discharge hole in the bottommost part of the reducing, volatilizing and smelting furnace for beingrecycled; and molten slag is discharged through a slag outlet, water slag and the like or the molten slag is returned into a converter for being recycled. Waste containing iron, zinc, lead, copper, tin and the like, molten steel slag and coal gangue waste slag and the like are cooperatively and continuously treated to separate and recycle useful metal, so that remarkable energy-saving environment-friendly social benefits and economic benefits are achieved.

The invention relates to an energy-saving slag thermal insulator, and belongs to the technical field of energy conservation, emission reduction and comprehensive utilization in the metallurgy industry. The thermal insulator comprises the following main chemical components in percentage by weight: 25 to 70 percent of SiO2, 1 to 25 percent of Al2O3, 1 to 40 percent of CaO, 0 to 20 percent of MgO, 0 to 10 percent of F<->, 0 to 10 percent of R2O (R is a monovalent metal ion), 0 to 10 percent of Fe2O3, 5 to 60 percent of fixed carbon with bulk density of 0.25 to 0.75g/cm<3>. The thermal insulator has high thermal insulation performance and can reduce the thermal loss of high-temperature slag; the thermal insulator contains a certain amount of fixed carbon, so heat generated in the chemical reaction of the fixed carbon can be used for further making up the thermal loss of the slag; meanwhile, the thermal insulator belongs to a silicon-aluminum material, and part or all of the thermal insulator can be dissolved in the slag finally so as to improve the chemical composition of the slag and reduce the melting point of the slag. The thermal insulator has the advantages of simple production process, low cost, and suitability for various processes for utilizing the sensible heat of the slag, increasing the fluidity of the slag or improving the performance of the slag.

The invention discloses a waste-heat pressure closed-loop thermal treatment method for molten steel slag and is characterized in that the method comprises the following steps of: (1) molten steel slag turning: turning the molten steel slag to a pre-treatment chamber through a slag tank over-turning vehicle; (2) rolling and crushing: spraying water onto the surface of the molten steel slag through automatic water sprayers in the pre-treatment chamber to cool the slag, and rolling and crushing the cooled slag through a rolling and crushing machine; (3) slag pushing: allowing the rolling and crushing vehicle to push the block-shaped high-temperature steel slag which is cooled in the pre-treatment chamber into a slag tank through a discharge port; (4) transport: transporting the slag tank which holds the block-shaped high-temperature steel slag to a waste-heat pressure closed-loop thermal treatment tank through a transport trolley; and (5) slaking: spraying water onto the surface of the block-shaped high-temperature steel slag to generate vapor, and converting f-CaO and f-MgO under the alternating vapor pressure to allow self-slaking and powdering of the steel slag. The method eliminates the limitations of temperature and fluidity of the steel slag, achieves the continuous, mechanical and automatic process of steel slag treatment, and has the advantages of energy conservation, land conservation, high efficiency and high safety.

The invention discloses a treatment method for vitrifying arsenic-alkali residue, aiming at solving the problem of pollution or potential menace of the existing arsenic-alkali residue treatment process on environment. The treatment method for vitrifying the arsenic-alkali residue comprises the following steps of: selectively reducing sodium antimonate in the arsenic-alkali residue to metallic antimony by a carbon reducing agent in a molten state and keeping arsenic in the residue in the form of sodium arsenate; and then adding a glass molten solvent in the arsenic-containing residue to form a low-temperature glass phase, discharging the glass phase, and then carrying out water-quenching on the glass phase into broken glass pieces or directly casting the glass phase into a glass ingot in an ingot casting mould, thus facilitating piling up or returning to a pit and land-filling. According to the invention, the recovery rate of antimony in the arsenic-alkali residue is greater than 95%, and the content of arsenic in the metallic antimony is less than 3%; and the arsenic-containing glass pieces belong to general solid wastes and can be directly piled up in the open air or land-filled.

The invention discloses an afterheat recovery system and an afterheat recovery method of dry granulating liquid slag. The system comprises a granulating cabin, a moving bed and an afterheat recovery system, the inner surface of the granulating cabin is provided with a granulating cabin water cooling wall, the center of the top of the granulating cabin is provided with a slag pipe, the slag pipe extends into the granulating cabin, the lower part of the tail end of the slag pipe is provided with a centrifugal granulator, the centrifugal granulator is connected with a motor arranged at the lower part of the centrifugal granulator, the lateral side of the centrifugal granulator is provided with an air supply pipeline, an annular air opening is formed between the centrifugal granulator and the air supply pipeline, the lower part of the granulating cabin is provided with the moving bed, the inner surface of the moving bed is provided with a moving bed water cooling wall, the top of the moving bed is provided with an air outlet, the bottom of the moving bed is provided with a slag discharge device, an air inlet device is arranged above the slag discharge device, the afterheat recovery system comprises a primary dust remover, an afterheat boiler, a secondary dust remover, an exhaust fan and a chimney which are connected in sequence, and the primary dust remover is connected with the air outlet arranged at the top of the moving bed. The system and the method effectively solve the problems of heat recovery and furnace slag granulation of equipment such as a blast furnace.

The invention belongs to the field of recycling of steel slag, in particular to a method for recycling iron from steel slag. The method comprises the following steps of: (1) pouring steel slag into a grate plate with the length and the width of 180 mm respectively, leading the steel slag with granularity smaller than 180 mm to enter an underground material bin and carrying out first iron recycling on the steel slag with granularity larger than 180 mm by an electromagnetic sucking disk; (2) magnetically separating and crushing the steel slag with granularity smaller than 180 mm, wherein the crushed granularity is smaller than 60 mm; (3) magnetically separating the crushed steel slag; (4) screening by a vibrating screen, leading steel slag with granularity larger than 25 mm to enter a cone crusher for carrying out second crushing with the crushed granularity smaller than 25 mm, and magnetically separating; (5) grinding steel slag with granularity smaller than 25 mm, screening by a cylinder screen with granularity of 2 mm and remelting particle steel with granularity larger than 2 mm for utilizing; and after magnetically separating steel slag with granularity smaller than 2 mm by a wet magnetic separator, separating iron fine powder and tailings. The invention can recycle iron in the steel slag and reduce the iron content of the steel slag below 0.5 percent.

The invention discloses a slag metallurgy smelting reduction production method and belongs to the field of non-blast-furnace ironmaking and comprehensive utilization of resources. The molten state is kept by adding a reducing agent and iron-containing materials in reaction slag, and smelting reduction ironmaking is performed; the requirements of temperature, alkalinity and sufficient mixing are met in the reacting process, the slag obtained through a reaction is treated; the reduced slag can serve as a cement adding agent and a cement adjusting agent or directly serves as cement clinker; other components can also be added to produce cement clinker high in additional value, and efficient and comprehensive utilization of resources is achieved; and the method is a new smelting reduction ironmaking method. The method is short in reaction time, high in metal recycling rate, low in production cost, high in raw material adaptability, large in treatment amount, environment-friendly and high in economic benefit, is a new smelting reduction ironmaking process, and can effectively solve the metallurgy resource recycling problem.

The method to pour residual hot steel sludge for recovery in steel production comprises: a. after casting, pouring the residual steel sludge into empty ladle; b. conveying the sludge to converter and tapping; c. refining; d. casting; repeating. This invention makes full use of the sulfur capacity and strong reducibility to absorb inclusion and improve liquid steel cleanness rapidly, overcomes the consumption for low-melting, and reduces pollution and cost.

The invention relates to an optimized process for processing steel slag by magnetic separation, which is characterized by comprising the following steps: (1) screening steel slag by using a No.1 vibrating screen, separating out the steel slag and slag steel by using a No.1 magnetic separator to separate the oversize material, feeding the slag steel to a slag steel tank, and feeding the steel slagto a jaw crusher; (2) feeding the screen underflow of the No.1 vibrating screen and the discharge of the jaw crusher to a No.2 vibrating screen together, separating the oversize material by using a No.2 magnetic separator, feeding the separated slag steel to a rod mill, and stripping steel slag on the slag steel by the vibration effect of the rod mill; (3) feeding the steel slag separated out by the No.2 magnetic separator to a No.3 vibrating screen, feeding the oversize material to a large-size tailing storeroom, and feeding the screen underflow to a medium-size tailing storeroom; and (4) feeding the discharge of the rod mill to a No.4 vibrating screen, feeding the oversize material the iron content of which is no less than 90% to the slag steel tank, feeding the screen underflow to a No.3 magnetic separator, feeding the separated steel slag magnetic separation powder to a magnetic separation powder storeroom, and feeding the steel slag to a small-size tailing storeroom. By using theinvention, high-quality slag steel the iron content of which is more than 90% can be obtained, thereby fully recovering the iron in the steel slag.

In one aspect the invention provides a system for treating a wastestream, particularly a radwaste, for safe disposal and, in final processing converting it into one or both forms including an aqueous form for safe discharge to the environment and a solidified form for safe disposal. In another aspect the invention provides the capacity to employ a step where a specific target element strategy can be set up synchronizing sorbent substance choices and multiple recycle options to remove target substances from wastestream as a part of its Sorption or Powder Sorbent Isotopic Reduction step (II). Other steps cooperate with Sorption step (II) including Oxidation (I), Solid-Liquid separation (III), and Selective Ion Exchange (IV) to deliver the wastestream to final processing.