Technology and Mechanism of Valuable Metal Recovery from Pyrite Cinder by Chloridizing Roasting

2012 ◽  
Vol 588-589 ◽  
pp. 1671-1676
Author(s):  
Shao Jun Bai ◽  
Shu Ming Wen ◽  
Qi Cheng Feng ◽  
Yu Chen ◽  
Jian Liu
Keyword(s):  
Steel Industry ◽  
New Technology ◽  
Metal Recovery ◽  
Raw Material ◽  
Pyrite Cinder ◽  
Valuable Metal ◽  
Zinc Compounds ◽  
Lead And Zinc ◽  
Chinese Steel Industry ◽  
Iron Bearing

A new technology of pellet production-drying-chloridizing roasting is proposed for valuable metal recovery from pyrite cinder with high content of lead and zinc. The pyrite cinder, containing 60.15% Fe, 2.02% Pb and 2.15% Zn, was pelletized with addition of 2% bentonite in pan pelletizer. Green balls after drying were roasting at 1100 °C for 60 min with 5 wt % of CaCl2 addition in tube furnace. The results demonstrate that pellets with 61.58% of TFe, lead and zinc volatile ratios of 98.02% and 96.83% were obtained. Key technique is that CaCl2 reacts with lead and zinc compounds and the chloride can be volatilized at moderate temperatures. This new technology can recover the valuable metal fully from pyrite cinder and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of pyrite cinder and extend raw material sourcing for Chinese steel industry.

Comprehensive Utilization of Sulfuric Acid Residue with High Content of Copper by Pellet Production-Drying-Chloridizing Roasting

2012 ◽  
Vol 524-527 ◽  
pp. 2004-2010
Author(s):  
Shao Jun Bai ◽  
Shu Ming Wen ◽  
Jiu Shuai Deng ◽  
Dan Liu ◽  
Yu Chen
Keyword(s):  
Sulfuric Acid ◽  
Steel Industry ◽  
New Technology ◽  
Raw Material ◽  
Comprehensive Utilization ◽  
Pellet Production ◽  
Copper Compounds ◽  
Simultaneous Decrease ◽  
Chinese Steel Industry ◽  
Iron Bearing

A new technology of pellet production-drying-chloridizing roasting is proposed for comprehensive utilization of sulfuric acid residue with high content of copper, a common by-product in vitriol industry. The sulfuric acid residue, containing 60.27% Fe, and 1.61% Cu, was pelletized with addition of 5% bentonite in pan pelletizer. Green balls after drying with 2.3% of water retention were roasting at 1100 °C for 30 min with 5 wt % of CaCl2addition in tube furnace. The results demonstrate that pellets with 60.58% of TFe, a copper volatite ratio of 97.8% were obtained with simultaneous decrease in the copper content down to 0.035%. Key technique is that CaCl2reacts with copper compounds and the chloride can be volatilized at moderate temperatures. This new technology can be used to fully utilize sulfuric acid residue and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of sulfuric acid residue and extend raw material sourcing for Chinese steel industry.

Comprehensive Utilization of Pyrite with High Content of Asrenic

2012 ◽  
Vol 524-527 ◽  
pp. 965-968 ◽  
Author(s):  
Dan Liu ◽  
Shu Ming Wen ◽  
Yong Jun Xian ◽  
Hai Ying Shen ◽  
Shao Jun Bai ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Steel Industry ◽  
Raw Material ◽  
High Quality ◽  
Comprehensive Utilization ◽  
Roasting Temperature ◽  
Chinese Steel Industry ◽  
Iron Bearing

A technology of “arsenic removing- sulfuric acid producing- residuals for ironmaking” is proposed for comprehensive utilization of pyrite with high content of arsenic. The effect of roasting temperature and time on arsenic removing was investigated. The arsenic removed residuals obtained under the optimal arsenic removed conditions, was used to be proceeded for sulphur volatilization test. The results demonstrate that final residuals with 63.53% of Fe can be used for steel industry. This technology can be used to fully utilize sulphur and produce high quality concentrate as iron-bearing feed for steel industry, which will help to reduce the pollution of arsenic and extend raw material sourcing for Chinese steel industry.

Arsenic Removal from Pyrite Cinders by Oxidizing Roasting with Sodium Hydroxide Addition

2014 ◽  
Vol 881-883 ◽  
pp. 1655-1659 ◽  
Author(s):  
Shao Jun Bai ◽  
Shu Ming Wen ◽  
He Fei Zhao ◽  
Chao Lv
Keyword(s):  
Sodium Hydroxide ◽  
Steel Industry ◽  
Arsenic Removal ◽  
Raw Material ◽  
Iron Concentrate ◽  
Roasting Temperature ◽  
Chinese Steel Industry ◽  
Iron Bearing ◽  
Pyrite Cinders ◽  
High Arsenic

A craft of sodium hydroxide roasting-aqueous leaching process is investigated for the treatment of a high arsenic pyrite cinders, a common by-product in vitriol industry. The pyrite cinders, containing 58.27% Fe, and 0.98% As, was conducted for the craft. The results demonstrated that iron concentrate with 58.87% Fe, 0.13% As and 87.40% of arsenic removal percentage was obtained under the optimal conditions (a roasting temperature of 1000°C, a roasting duration of 120 min and a mass ratio of sodium hydroxide to pyrite cinders of 8%).This craft can be used to utilize pyrite cinders and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of pyrite cinders and extend raw material sourcing for Chinese steel industry.

Recovery of Iron from Cyanide Residues by Carbothermic Reduction-Magnetic Separation

2014 ◽  
Vol 692 ◽  
pp. 332-336 ◽  
Author(s):  
Liang Mou Yu
Keyword(s):  
Magnetic Separation ◽  
Steel Industry ◽  
Carbothermic Reduction ◽  
Industrial Wastes ◽  
Raw Material ◽  
Iron Recovery ◽  
Cyanide Leaching ◽  
Iron Concentrate ◽  
Chinese Steel Industry ◽  
Iron Bearing

A craft of carbothermic reduction-magnetic separation process is investigated for the recovery of iron from cyanide residues, a hazardous industrial wastes when produce gold with cyanide leaching method. The cyanide residues, containing 30.12% Fe was conducted for the craft. The results demonstrated that iron concentrate with 60.25% Fe and 79.85% of iron recovery was obtained under the optimal conditions (a reduction temperature of 950°C, a reduction duration of 60 min, a pulverized coal dosage of 10% and a potassium carbonate dosage of 4%).This craft can be used to utilize cyanide residues and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of cyanide residues and extend raw material sourcing for Chinese steel industry.

Treatment of Pyrite Cinders for Arsenic Removal Using Acid Leaching Process

2013 ◽  
Vol 634-638 ◽  
pp. 3541-3544
Author(s):  
Shao Jun Bai ◽  
Shu Ming Wen ◽  
He Fei Zhao ◽  
Qin Bo Cao ◽  
Hai Ying Shen ◽  
...  
Keyword(s):  
Steel Industry ◽  
Arsenic Removal ◽  
Acid Leaching ◽  
Raw Material ◽  
Pyrite Cinder ◽  
Iron Concentrate ◽  
Solid Ratio ◽  
Leaching Process ◽  
Chinese Steel Industry ◽  
Sulphuric Acid Concentration

A craft of concentrated acid-heating reinforced leaching process is investigated for the treatment of a high arsenic pyrite cinder, a common by-product in vitriol industry. The pyrite cinder, containing 57.37% Fe, and 2.78% As, was conducted for the acid leaching process. The results demonstrated that iron concentrate with 60.57% Fe, 0.28% As and 96.23% of iron recovery was obtained under the optimal acid leaching conditions(Sulphuric acid concentration is a mass ratio of 20%, a leaching temperature of 60°C, a liquid-solid ratio of 2:1 and a leaching time of 120 min).This craft can be used to utilize pyrite cinder and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of sulfuric acid residue and extend raw material sourcing for Chinese steel industry.

Research on Efficient Utilization of Sulphur Concentrate with Deep Flotation Method

2012 ◽  
Vol 588-589 ◽  
pp. 27-33
Author(s):  
Dan Liu ◽  
Shu Ming Wen ◽  
Qin Bo Cao ◽  
Hai Ying Shen ◽  
Jiu Shuai Deng ◽  
...  
Keyword(s):  
Steel Industry ◽  
Raw Material ◽  
Test Scheme ◽  
Efficient Utilization ◽  
High Quality ◽  
Iron Concentrate ◽  
Flotation Method ◽  
Iron Grade ◽  
Chinese Steel Industry ◽  
Iron Bearing

A technology of “depth cleaning- sulfuric and acid producing- residuals for ironmaking” is proposed for efficient utilization of sulphur concentration with high quality. The effect of the main factors involving grinding fineness, activators, collector type and dosage was investigated. On this regard, a close-circuit flotation test scheme was proceeded, by which a high quality sulphur concentrate was obtained with 52.39% of iron grade, 86.44% of iron recovery, 39.46% of sulphur grade and 91.52% of recovery sulphur. This concentrate can be directly used in the production of sulfuric acid and preparation of iron concentrate. This technology can be used to fully utilize sulphur and produce high quality concentrate as iron-bearing feed for steel industry, which will help to extend raw material sourcing for Chinese steel industry.

scholarly journals Alkaline Leaching of Low Zinc Content Iron-Bearing Sludges

2016 ◽  
Vol 61 (1) ◽  
pp. 43-50 ◽  
Author(s):  
K. Gargul ◽  
P. Jarosz ◽  
S. Małecki
Keyword(s):  
Steel Industry ◽  
Elevated Temperatures ◽  
Zinc Content ◽  
Size Composition ◽  
Alkaline Leaching ◽  
Zinc Compounds ◽  
Ambient Temperatures ◽  
Thermodynamic Conditions ◽  
Bearing Materials ◽  
Iron Bearing

Various types of waste materials containing zinc (e.g. dusts and sludges from gas dedusting process) are obtained in steel industry. The contents of Zn in these materials may vary considerably. Even a low concentration of zinc in recirculated products precludes their recycling in ferrous metallurgy aggregates. Long storage of this type of material can lead to contamination of soil and water by zinc compounds which can be leached out by acid rain, for example. This paper focuses on research involving alkaline leaching tests of low zinc content iron-bearing materials. These tests were preceded by the analysis of the elemental, phase and grain size composition, and analysis of the thermodynamic conditions of the leaching process. The main aim of research was to decrease the content of the zinc in the sludge to the level where it is suitable as an iron-bearing material for iron production (~1% Zn). Leaching at elevated temperatures (368 K, 60 min) has led to a decrease in the zinc content in the sludge of about 66%. The research revealed that long hour leaching (298 K, 100 hours) carried out at ambient temperatures caused a reduction in zinc content by 60% to the value of 1.15-1.2% Zn.

scholarly journals Factors Affecting the Metal Recovery Yield during Induction Melting of Aluminium Swarf

2012 ◽  
Vol 730-732 ◽  
pp. 781-786
Author(s):  
Hélder Puga ◽  
Joaquim Barbosa ◽  
Carlos Silva Ribeiro
Keyword(s):  
Processing Parameters ◽  
High Energy ◽  
Metal Recovery ◽  
Raw Material ◽  
Protective Atmosphere ◽  
Induction Melting ◽  
Recovery Rates ◽  
Recovery Yield ◽  
High Efficient ◽  
Machining Operations

Machining operations of cast parts usually generate considerable amounts of waste in the form of chips (usually 3–5% of the casting weight). Traditionally, swarf is sold to scrapers and remelters, but this option is quite expensive because the selling price is roughly 30% of the acquisition price of the commercial 2nd melt raw material. For most aluminium foundries that incorporate machining operations in their products, reusing aluminium chips as raw material for the melting stocks is perhaps the best option as waste management policy in what concerns to economical and technical aspects. Nevertheless, aluminium swarf is a low density product (0.25 kg/dm3) and is usually covered by a thin film of aluminium oxide and machining fluid. Melting such a product without suitable previous preparation leads to very low metal recovery rates, high energy consumption, gases and smoke generation and very low quality of the final product. During the last years, the authors have developed a high efficient and environmentally friend aluminium swarf recycling technique, using direct incorporation in aluminium melts. The influence of processing parameters, namely melt temperature and holding time, melting atmosphere, swarf briquetting pressure and melting charge composition in the metal recovery yield and dross generation was studied and characterized, and the optimal processing parameters were established. The microstructure of the final product obtained in those conditions was evaluated and is also presented. It is shown that the recycling efficiency depends on the swarf conditioning, the melting technique and the melt treatment methodology. Swarf moisture reduction, induction melting under protective atmosphere and a specially developed degassing technique were found the most important factors influencing the recycling process. By using the developed technique, cast ingots with microstructure and sanity similar to commercially available AlSi12Cu1 2nd melt raw material were successfully obtained with minimal dross formation and metal recovery rates around 90%, without using traditional salts and fluxes.

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