leaching with sulfuric acid of the chromite plant

Effect of Eh in the high pressure acid leaching of nickel
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The results also showed that the sulfuric acid concentration and oxidant have a marked influence on the extraction yield of chromium and on the leaching reaction rate and the best results were...

Sulfuric Acid Leaching of South African Chromite Part 2
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The sulfuric acid leaching behavior of the chromite in Zhao et al s study can be illustrated as shown in Figure 3 where four types of spinel denoted as I II III and IV represent different...

Sulfuric Acid Processing for the Production of Chromite
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to solid ratio of 10 at 120 176 C for 90 minutes sulfuric acid leaching with30 ammonium hydrosulfate solution and gravity concentration on centrifugal separator The final chromite concentrate contained 592 Cr 2 O 3 with a recovery of 868 Keywords beneficiationof sludge tails chromite concentrate centrifugal separator autoclave...

PDF Sulfuric acid leaching of Turkish chromite concentrate
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The optimum process conditions of leaching treatment were found to be a temperature of 176 176 C a dichromic acid/chromite mass ratio of 012 and a sulfuric acid concentration of 81...

Study on mechanisms of different sulfuric acid leaching
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The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an oxidizing agent The results show that the main phases in...

KR101294922B1
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This combined leaching treatment method involves the intermediate piece 0075-05mm 1 subjected to atmospheric leaching AL and the water 3 having a high concentration of dissolved iron and aluminum and a high residual acidity flows out of the water 3 was fed during the pressurized acid leaching HPAL of the subsequent fine pieces...

Sulfuric acid leaching of Turkish chromite concentrate
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Nov 01 2002 0183 32 In this research work the sulfuric acid leaching of a typical Turkish chromite concentrate was studied The following was concluded considering the experimental results 1 In the absence of perchloric acid the maximum chromium extraction was about 58 under the conditions of 175 176 C 70 vol H 2 SO 4 814 wt and 2 h 2...

Sulfuric acid leaching kinetics of South African chromite
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The sulfuric acid leaching kinetics of South African chromite was investigated The negative influence of a solid product layer constituted of a silicon-rich phase and chromium-rich sulfate was eliminated by crushing the chromite and by selecting proper leaching conditions The dimensionless change in specific surface area and the conversion rate of the chromite were observed to exhibit a...

Hot Filtration A Way to Enhance the Recovery of Chromite
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A high grade chromite concentrate obtained from the Pinarbasi region of Kayseri province in Turkey was reacted with a solution of sulfuric acid and perchloric acid at atmospheric pressure The effects of temperature duration sulfuric acid concentration and perchloric acid addition on leach recovery were determined in several experiments...

Leaching Process For Chromite
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Experimental Study on Sulfuric Acid Leaching Behavior of Utilizing Pakistan chromite as raw material the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of...

Sulfuric Acid Leaching of South African Chromite Part 1
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The sulfuric acid leaching process is widely considered to be a cleaner technology to prepare chromium salt from natural chromite as no Cr VI -bearing wastes are generated or discharged...

Study on mechanisms of different sulfuric acid leaching
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The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an oxidizing agent...

A 1 PROJECT BASIC INFORMATION
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The Hydrometallurgical Processing Plant HPP is designed to produce 30 000T of Nickel and 2 640T of Cobalt as Mixed Sulfides MS at high recovery rates by the acid leaching of low-grade lateritic ore This low-grade ore is supplied by Taganito Mining Corporation HPP uses sulfuric acid at high pressure and temperature in an autoclave...

Leaching and recovery of platinum group metals from UG
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A roast-leach procedure has been applied to Stillwater flotation concentrate9 The material was roasted at 1050 176 C to convert BMS to oxides and PGM sulphides to metals After pre-leaching with sulphuric acid to remove soluble minerals the PGM were leached at ambient temperature with 6M HCl in the presence of oxidant hydrogen peroxide chlorine...

Bioleaching metal solubilization by microorganisms FEMS
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As in the case of manganese leaching metal solubilization may be due to enzymatic reduction of highly oxidized metal compounds or is effected by the production of organic acids eg lactic acid oxalic acid citric acid gluconic acid and by compounds with at least two hydrophilic reactive groups eg phenol derivatives which are...

Leaching geochemistry of soil Britannica
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Leaching in geology loss of soluble substances and colloids from the top layer of soil by percolating precipitation The materials lost are carried downward eluviated and are generally redeposited illuviated in a lower layer This transport results in a porous and open top layer and a dense...

Development of a Laboratory
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The release of copper present in the fly ash as chalcocite Cu2S or cuprite Cu2O was dependent on the metabolic activity of T ferrooxidans whereas other metals such as Al Cd Cr Ni and Zn were solubilized by biotically formed sulfuric ac Chemical leaching with 5 N H2SO4 resulted in significantly increased solubilization only for Zn...

Caustic Leaching of Montana Chromite
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Chromite Solvent 8 parts of 95 per cent sulfuric acid and 3 parts of 85 per cent phosphoric ac Oxidation Solution 2 parts of 72 per cent perchloric acid and 1 part of distilled water Standard Solutions 005 N ferrous sulfate and 10 N ceric sulfate Indicator 0025 1 solution of Ferroin Other Materials Finely Bround crystals of...

Cypress Development Announces Further Advancement in
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Chloride-based leaching represents an alternative to sulfuric acid and could be impactful in the areas of economy process and the environment There are still important trade-offs to consider with respect to power and acid supply as well as some remaining analyses but this is an alternative that will most likely become the focus of the...

Leaching of Chromite in Sulfuric Acid
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Leaching reaction of chromite in H 2 SO 4 with K 2 Cr 2 0 7 as an oxidizing agent was studied Since it was found that for the dissolution of chromite in H 2 SO 4 the oxidation of ferrous iron in the ore to ferric state was an important factor the extraction of Cr was restricted by the ratio of FeO content in the ore to the theoretical amount derived from Cr 2 0 3 content...

The Corrosion Resistance of Nickel
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Worldwide more sulfuric acid H 2 SO 4 is produced than any other chemical It used to be that the annual consumption of sulfuric acid could serve as an economic indicator as so many chemicals and their derivatives are based on its use However this relationship is now only coincidental because the use of sulfuric acid for the acidulation of...

Environmental Impact of Sulfuric Acid Leaching
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Sulfuric acid the leaching agent is brought on site in large tankers The sulfuric acid is diluted and sprayed or dripped over oxide ore which dissolves the oxidized minerals completely in the solution The solution pregnant with the dissolved metals is then piped to the SX-EW plant that separates out the copper into 99 pure...

US6312500B1
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A process is provided for heap leaching ore to recover nickel The process is particularly effective for ores that have a tangible clay component ie greater than about 10 by weight The process includes sizing the ore where necessary forming pellets by contacting ore with a lixiviant and agglomerating The pellets are formed into a heap and leached with sulfuric acid to extract the...

US Patent for Process for atmospheric leaching of laterite
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An atmospheric leaching process for the recovery of a nickel and cobalt from a lateritic ore includes a preparing a slurry of the lateritic ore with saline or hypersaline water having a total dissolved solids TDS content greater than 30 g/L b leaching the slurry of the lateritic ore with sulfuric acid at atmospheric pressure and c recovering nickel and cobalt from the resultant leachate...

High Pressure Acid Leach
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High Pressure Acid Leach HPAL is a process used to extract nickel and cobalt from laterite ore bodi The HPAL process utilizes elevated temperatures roughly 255 degrees Celsius elevated pressures roughly 50 bar or 725 psi and sulfuric acid to...

Mining and Extraction Oxide Ores
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This is scrubbed from the flue gases to make sulfuric acid for leaching copper from oxide or Scrubbing sulfur dioxide also protects the environment A by-product of the smelting and converting furnaces is sulfuric ac In what looks like a lucky coincidence sulfuric acid is needed to treat oxide ores in processes called leaching and SX-EW...

Sulfuric acid leaching of South African chromite Part 1
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Jul 10 2014 0183 32 The leaching behavior of both the silicate and the spinel phases was investigated in the current study Before the test a chromite lump was polished by polisher and several types of abrasive paper to get two smooth flat surfac 100 mL 80 wt sulfuric acid and 1 g oxidant were mixed in a glass beaker on an automatic temperature-controlled electric heater and the heating of the solution...

Acid Treatment for Drain Fields and Cesspits
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Acid treatment for drain fields and cesspits has been the center of controversy for many years This post will give the reader some insight into the pros and cons of using chemical additives in a drain fields cesspits and cesspools Chemical additives such as caustic soda hydrogen peroxide sulfuric acid have all been used as chemical additives in the treatment of bio mat buildup in septic...

Recovery of chromium from residue of sulfuric acid
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Jan 01 2018 0183 32 In the sulfuric acid leaching process for chromite a strong oxidizing environment is maintained by the presence of oxidant and the employment of concentrated sulfuric ac From Fig 1 it can be confirmed that Cr 2 SO 4 3 could precipitate from the solutions and be stable under leaching conditions area delimited by the dotted box while...

Leaching of Valuable Elements from the Waste Chromite Ore
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The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process...

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