— The key to these processes is to transfer the chromium in the slag into soluble chromium salt (such as Na 2 CrO 4) by alkaline roasting. The alkaline roasting-water leaching process for recovering chromium from SSS slag mainly comprise alkaline roasting with NaOH, Na 2 CO 3, or NaOH (-NaNO 3). Table 8 was showed a …
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— Employing chromium-containing waste slag to produce glass–ceramic has the advantages of a large treatment capacity, readily available raw materials, low cost, …
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— Abstract Chromium leaching from stainless steel slag should be dealt with when utilized them as construction materials, an original idea of increasing calcite coating compactness in slag matrix is proposed for solving this problem. The paper originally proposes a carbonation strategy balancing carbon dioxide sequestration efficiency and …
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— The proposed process includes the steps of: (a) crushing waste copper slag; (b) mixing the waste slag crushed in step (a) with petroleum coke as a reducing agent and subjecting the mixture to a reduction reaction; (c) crushing the material resulting from step (b); and (d) separating the material obtained in step (c) by dry magnetic separation ...
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— Chrome ore gravity mining equipment includes the jig separator, shaking table, spiral classifier, centrifugal concentrator, and spiral chute. A weak or high-intensity magnetic separator is sometimes …
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— Grate fly ash and fluidized bed fly ash mixed with glass cullet additive respectively were melted in the electronic arc-furnace. The product, arc-melting slag, was further treated by crushing, pressing and heat treatment in order to make the glass-ceramics. The crystallization behaviors of the produced glass-ceramics were examined …
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— Green glazes were successfully prepared using ferrochromium slag waste as chromium and iron precursors by introducing Co2O3 as coloring agent. The performance of the glazes was investigated by XRD, EDS, FT-IR, and UV-vis. A chromatic mechanism was proposed to explain the variation of glaze colors with the increase of Co2O3 content. …
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— Hot smothering technology based on waste heat from the steel slag mixed crushing is operated at a pressure of 0.2–0.4 MPa. The steel slag in the hot smothering tank is sprayed into a large amount of water to allow f-CaO disintegration of the steel slag for 2 h. In this process, considerable low-pressure saturated steam is generated.
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— Slags are byproducts of the metallurgical industry. It is of importance to recycle materials and recover heat from metallurgical slags to reduce the energy consumption and environmental impact of steel industry. China is the largest iron- and steelmaking slag producer in the world, and intensive efforts have been made during last …
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• Full range of crushing and screening equipment portfolio, we find the optimal size crushing solution for customer-specific input materials, • Tailor made cleaning drums and trommel …
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the iron and steel production process, which is composed of various oxides oxidized by impurities such as silicon, manganese, phosphorus, and sulfur in pig iron in the smelting process and
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DOI: 10.1016/J.JCLEPRO.2021.126467 Corpus ID: 233553327; Recovery of chromium from chromium-bearing slags produced in the stainless-steel smelting: A review @article{Gu2021RecoveryOC, title={Recovery of chromium from chromium-bearing slags produced in the stainless-steel smelting: A review}, author={Foquan Gu and Yuanbo …
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— Steel slag is a major by-product generated by the steel industry. Although steel slags are classified as non-hazardous thermal waste according to the decree 2002–540 and US EPA [], it is well known that most metals they contain are quite toxic to living organisms and may pose serious environmental issues.In France, the CTPL [] …
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— The cone crusher is widely used for the intermediate crushing processing of steel slag and adopts the laminated crushing method. The rolling mortar wall moves towards the crushing wall to …
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— The steel slag waste after various mechanical equipment processes will be reused in multiple industries, directly turning it into treasure. For example, the steel industry produces a large amount of …
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Once the ore is on the surface, the process of getting the mineral you want out of the rock can start. Once the mineral is separated from the rest of the rock, the mineral needs to be cleaned so that it can be used. This process can be represented by the following flowchart diagram: In this chapter we will look at each of the steps in more detail.
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— A process, using an air-pulsated BATAC jig—a well-known standard equipment for beneficiation of coal and ores—was found to be suitable for treating …
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— Physical separation methods including gravity and magnetic, smelting reduction process, alkaline roasting-water leaching process, alkaline leaching process, and bioleaching process have been previously applied to recover chromium from the SSS …
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— Ferrochrome slag (FCS) is a by-product of ferrochrome industries and is produced during the extraction of ferrochrome from chromite ore. The chemical composition of FCS comprises of 27–33% SiO2 ...
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— The extraction of vanadium and chromium from high chromium content vanadium slag by salt roasting and water leaching process has been investigated, which uses mixed sodium salts (Na2CO3 and NaOH) as …
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Solution. Efficiency of material utilization is vital in any industry – steel mills and foundries are no exception. Recycling and utilizing slag instead of treating it as waste enable cutting costs and generating new revenue. …
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— 3.2. Basic properties of steel slag. Steel slag is a typical polymetallic symbiotic resource, and its chemical composition could affect the effect of element recovery (An et al., 2023).The chemical composition of steel slag usually depends on factors such as the smelting process and the silicon content of the mineral.
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— Chromium has three common oxidation states, two of which Cr(II) and Cr(III) are basic and the other Cr(VI) is acidic. Chromium metal is an essential trace element, however, hexavalent chromium [Cr(VI)] is toxic and carcinogenic. Chromite is an important commercial chromium-bearing mineral. It is an oxide of chromium and iron (FeO, Cr 2 O …
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When a jaw crusher is equipped with the ASC system, the crushing forces are carried by massive hydraulic cylinders mounted into the rear header casting. If an uncrushable object enters the crusher cavity and crushing …
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Download scientific diagram | Construction waste crushing and screening equipment. from publication: Laboratory Tests on Compaction and Crushing Behaviors of Construction Waste Slag–Clay ...
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— Slags from the production of high‐alloyed steel contain both chemically bound chromium (mainly as Cr2O3) in the mineral fraction and elemental chromium in the metallic remainders. Thermochemical post treatment of the slag in an electric arc furnace under reducing conditions enables the nearly complete recovery of the total amount of …
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— The process involves intense reaction of aluminum powder and chromium oxide in the molten state, then rapid transition from alumina to corundum, and a small amount of unreacted Cr 2 O 3 forms a solid solution with the reaction product Al 2 O 3, namely the aluminum chromium slag, referred to as the chromium slag.. Process …
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— The content of chromium in the crust is 0.006–0.035%, which belongs to one of the widely distributed elements. Chromium-containing minerals with industrial utilization value are chromium spinel minerals, and the chemical general formula is (Fe, Mg)(Cr, A1, Fe) 2 O 4 or (Fe, Mg)O·(Cr, Al, Fe) 2 O 3, in which the content of chromic oxide (Cr 2 O …
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Recovery of metal from slag/mixed metal generated in ferroalloy plants—a case study ... The narrower the size range of the feed, the better would be the performance of any gravity separation equipment. After crushing the …
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— The present paper showed the possibilities of processing secondary waste material (slag) leachates and preparing solid product with parameters approaching chromite ore for further chromium production.
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Waste from electronics and electrical assemblies containing components such as accumulators, mercury-switches, glass from cathode-ray tubes and other activated glass polychlorinated biphenyl-capacitors, or contaminated with cadmium, mercury, lead nickel, chromium, copper, lithium, silver manganese or polychlorinated biphenyl.
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— Stainless-steel slag is a hazardous solid that has caused severe chromium contamination globally. This study proposes an environmentally benign vitrification …
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— This study proposes an environmentally benign vitrification process for efficient recycling and solidification of Cr from stainless-steel slag using waste copper slag and coal tar residue. The transformation behaviors of heavy metals (Cr, Cu, Pb, Zn) and the Cr toxic leaching mechanism are also determined in this work.
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