chromium slag


PDF chromium in soils contaminated by chromium containing slag

PDF Adobe Acrobat HTMLThe results show that the soils in the vicinity of slag heap have the highest total Cr content followed by the soils under the slag heap and near

On Yunnan s chromium trail Chinadialogue net

Pollution from chromium slag has occurred in the Chinese provinces of Jilin Liaoning and Qinghai In 1992 a truck overturned in northeast China near the border with North Korea spilling 1 5 tonnes of sodium dichromate – of which hexavalent chromium is a major part – polluting groundwater and poisoning 37 people

Selective leaching of chromium containing slag by HCl

A batch of column experiments was carried out to investigate the change of Cr VI concentration leached out from chromium containing slag with HCl as

Chromium slag contamination in China Chemistry World

Sep 19 2011 nbsp 0183 32The drivers were illegally dumping up to 5000 tonnes of chromium slag in nearby villages Chromium salts are widely used in metallurgy tanning and paint and dye making but their manufacture results in large amounts of slag which if not processed can form carcinogenic hexavalent chromium

Some smelter slags represent a significant environmental

Some smelter slags represent a significant environmental hazard Since the beginning of the industrial age slag the glassy material left over when metals are refined from ore has been

FactSheet Occupational Safety and Health Administration

FactSheet Hexavalent Chromium Hazards in Bridge Painting Hexavalent chromium or Cr VI is a toxic form of chromium that can cause severe health effects to workers including lung cancer

Process for Recovering Chromium Scrap

Described here is a process for recovering chromium and other metals from superalloy scrap Laboratoryscale experiments were conducted to test a complex flowsheet utilizing a wide range of extractive metallurgical operations

Static and Dynamic Leaching of Chromium VI from Chromium

Abstract Because the slag can be a major source of soil and groundwater pollution understanding the release and leaching behavior of hexavalent chromium Cr VI from chromiumcontaining slag is critical We report Cr VI behavior after static and dynamic leaching from chromiumcontaining slag deposited at a ferroalloy manufacturing plant in Hunan province China

MyHeadlinez News 39Chromium slag contamination in

MyHeadlinez News 39Chromium slag contamination in China 39 Chemistry World

Remediation of Cr VI from chromium slag by biocementation

Cr VI mobility was found to significantly be decreased in the exchangeable fraction of Cr slag and subsequently the Cr VI concentration was markedly increased in carbonated fraction after bioremediation It was found that such Cr slag bricks developed high

Chemical Pollution by Dumping Chromium Slag YouTube

2011817 Follow us on TWITTER twitter cnforbiddennews Like us on FACEBOOK facebook chinaforbiddennews 5000 tons of chromi

EXPERIMENTAL STUDY AND MODELLING OF VISCOSITY OF

several slag systems containing chromium oxides from a quasibinary system CrOxSiO2 to quasiternary and quaternary systems At low oxygen partial pressures such as in typical metallurgical processes the chromium in the slag appears simultaneously as divalent CrO and trivalent CrO1 5 oxides It was proven

Chromium sulfate Cr2 SO4 3 PubChem

ANIMAL STUDIES The toxicity of basic chromium sulfate was investigated in rats in a 13week noseonly inhalation study that included a 13week recovery period Basic chromium sulfate produced severe and widespread effects in the nasal cavity larynx lungs and mediastinal lymph node

Using Peroxide Fusions for the ICPOES Analysis of

Peroxide fusions in tandem with the Optima™ 7300 DV simultaneous ICP OES have the required analytical capabilities to carry out the analysis of ferrochrome chromium slag and chromite ore samples with excellent precision accuracy and speed of analysis

to extract vanadium and chromium from vanadium slag using

2013 A novel method to extract vanadium and chromium from vanadium slag The kinetics investigation indicates that the decomposition of vanadium slag is

Detoxification of chromium slag and contaminated soil PDF

Int J Environment and Waste Management Vol 13 Detoxification of chromium slag and contaminated soil Jianhua Xu and Yuguo Yang New

PDFchromium slag 2 3 chamttmljil ing the bal

PDF Adobe Acrobat HTMLcomprising comprises powdery and liquid components in the fol lowing °7¢ by weight sand 17 19 asbestos 8 10 ferro chromium slag 2 3 chamttml

Remediation of chromiumslag leakage with electricity

Aug 29 2014 nbsp 0183 32Dried chromiumslag was put into a glass column 4 glass columns were used with diameters of 2 cm 4 cm 6 cm or 8 cm and eluted by simulated acid rain

Reduction of Chromium Oxide in Stainless Steel Slags

chromium recovery from the slag to produce stainless crude metal before decarburization They melted 70㎏ of FeC Cr together with 3kg of the CaOSiO2Cr2O3FeOMgOAl2O3 slag with CaO SiO2 2 5 at 1873K and measured the reduction rate of Cr2O3 as functions of initial Cr2O3 Al2O3 C and Cr contents All slags

chromium chromium

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Chromium processing Britannica

Chromium processing preparation of the ore for use in various products Chromium Cr is a brilliant hard refractory metal that melts at 1 857 176C 3 375 176F and boils at 2 672 176C 4 842 176F In the pure state it is resistant to ordinary corrosion resulting in its appliion as an electroplated

Chemical stabilization treatment of chromium slag

ZHENG Li sheng WANG Shi rong LI Jian xia Chemical stabilization treatment of chromium slag J Modern Chemical Engineering in Chinese 1999

Chromium stability in steel slags Verlag Stahleisen

Chromium is an essential element in steelmaking industry Steel slag inevitably contains some chromium and there is a risk of Cr emission from slag to the environment however in which form the emission of the element occurs and whether it is a hexavalent Cr is a concern To

Chromium slag contamination in China News Chemistry World

Illegal dumping could have introduced hexavalent chromium into the water and soil of Yunnan province in China Ille

JP2002069520A Method for recovering chromium in slag

PROBLEM TO BE SOLVED To provide a method for recovering chromium in slag by which chromium oxide contained in the slag developed when molten stainless steel is subjected to decarburization refining is efficiently reduced and recovered in the molten stainless steel and the lowering of the chromium contained in the slag is performed and the recycling of the slag can be

Chemical Pollution by Dumping Chromium Slag YouTube

Aug 17 2011 nbsp 0183 32the chromium slag to Guizhou province for treatment To save transportation costs the drivers dumped halfway the chromium residue and they repeated this for 1 5 months dumping 5222 38 tons in total

Remediation of chromiumslag leakage with electricity

Chromium pollution has been historically widespread throughout the world Most available remediation technologies often require energy consumption This study is aimed to develop electrochemical remediation for Cr VI in chromiumslag leakage with selfgenerated electricity Dynamic leaching

High Strength Magnesium And Chromium Slag Dart For Arrest

High Strength Magnesium And Chromium Slag Dart For Arrest Slag Find Complete Details about High Strength Magnesium And Chromium Slag Dart For Arrest Slag

Chrome plating Wikipedia

Chrome plating less commonly chromium plating often referred to simply as chrome is a technique of electroplating a thin layer of chromium onto a metal object The chromed layer can be decorative provide corrosion resistance ease cleaning procedures or increase surface hardness Sometimes a less expensive imitator of chrome may be used for aesthetic purposes

Ferrochrome Wikipedia

Ferrochrome or Ferrochromium FeCr is a type of ferroalloy that is an alloy between chromium and iron generally containing 50 to 70 chromium by weight Ferrochrome is produced by electric arc carbothermic reduction of chromite Most of the world s ferrochrome is produced in South Africa Kazakhstan and India which have large domestic chromite resources

Thermal stabilization of chromium slag by sewage sludge

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Remediation of Cr VI from chromium slag by biocementation

As China is facing chromium slag accidents at the regular time intervals the technology discussed in the present study promises to provide effective and

Hexavalent chromium removal by ferrochromium slag PubMed

treatment of jigging water stream to be generated in a ferrochrome plant containing Cr VI can be accomplished by using ferrochromium slag and sulphuric

Chromium Stability in Steel Slags Elizaveta Cheremisina

Chromium is an essential element in steelmaking industry Steel slag inevitably contains some chromium and there is a risk of Cr emission from slag to the environment however in which form the

Stabilization of carbon dioxide and chromium slag via

The approach explores the feasibility of the promising technique without the need of energy input for simultaneous chromium slag remediation and generation of

Ferrochromium slag processing crusher Mobile Crusher

Ferrochromium slag beneficiation process flow by gravity methods from chromite ferrochrome slag recycling the use of two Jigging Machine sorting respectivel

CN101721784A Harmfree and recycling treatment method

The invention provides a harmfree and recycling treatment method for chromium slag In the method after being made into dried particles with the grain diameter of 0 510mm the chromium slag is mixed with tapped melting converter steel slag the addition amount of the chromium slag is 0 55 percent of the weight of the melting converter steel slag after the chromium slag is mixed with the

PRECIPITATION OF METALLIC CHROMIUM DURING RAPID

The slag samples contained different oxide phases The slag microstructure consists of the slag matrix and two chromium oxide based phases the chromite spinel phase and the calcium chromite phase similarly to the industrial samples 9 The analysis of the samples showed the precipitation of chromium rich oxide phases depends on Cr 2 O 3