Characteristics and Production Mechanism of Sulfuric Acid and Nitric-Hydrofluoric Acid Pickling Sludge Produced in Manufacture of Stainless Steel.

Ito, Masahiko; Tachibana, Rinso; Fukushima, Katsuji; Seino, Yoshikazu; Yamamoto, Akira; Kawabata, Yoshikazu

doi:10.1252/jcej.31.589

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…It was observed that sludge does not dissolve in water also. Above results are observed similar to the previous studies [2].…”

Section: Resultssupporting

confidence: 93%

“…An attempt was made to dissolve the sludge in acids namely, HCl, HCl+HNO 3 , HF, HClO 4 , but it could not be dissolved. Similar phenomenon has been reported by Ito et al [2].…”

Section: Chemical Characterization Of the Sludgesupporting

confidence: 91%

“…Characteristics and production mechanism of sulfuric acid and nitric-hydrofluoric acid pickling sludge produced in manufacturing of stainless steel was investigated by Ito et al [2]. As per their study, stainless steel pickling sludge consists largely of surface scale from stainless-steel strips, being composed mainly of Cr oxides.…”

Section: Literature Reviewmentioning

confidence: 99%

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Characterization of stainless steel pickling bath sludge and its solidification/stabilization

Singhal

Tewari

Prakash

2008

Building and Environment

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“…It was observed that sludge does not dissolve in water also. Above results are observed similar to the previous studies [2].…”

Section: Resultssupporting

confidence: 93%

“…An attempt was made to dissolve the sludge in acids namely, HCl, HCl+HNO 3 , HF, HClO 4 , but it could not be dissolved. Similar phenomenon has been reported by Ito et al [2].…”

Section: Chemical Characterization Of the Sludgesupporting

confidence: 91%

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Characterization of stainless steel pickling bath sludge and its solidification/stabilization

Singhal

Tewari

Prakash

2008

Building and Environment

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“…Characterisation of the sludge particles revealed following composition [33] Today, the disposal of spent acid and rinse water is still often done using precipitation neutralization with lime milk, a dispersion of solid Ca(OH) 2 in water. The generated neutralization sludge is dewatered in chamber filter presses and then dumped.…”

Section: Sludgementioning

confidence: 99%

“…[2]. According to Ito et al the particle size ranges from <0.5 μm up to 30 μm [33] and the concentrations of suspended solids is between 9 mg/L to 800 mg/L [34]. Measurement of the particle size distribution showed a time depending increase of the particle size (median value) from 9 to 53 µm.…”

Section: Introductionmentioning

confidence: 99%

Sustainable stainless steel – A review on acid regeneration systems for application in continuous pickling lines

Rögener¹,

Design²,

Lednova³

et al. 2019

VNMSTU

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Steels go through several processing steps to reach the desired state of delivery. Properties and quality of stainless steel are mainly determined by the quality of the product surface. In high temperature processes, such as annealing, rolling and forging, scale layers of 5 to 10 µm thickness consisting of oxides and oxide hydrates are formed on the steel surface. Furthermore, underneath the scale layer the chromium content of the alloy is depleted by diffusion effects, leading to reduced chemical stability. Thus, the chemical removal of both the scale layer and the chromium depleted layer in pickling processes is a fundamental step to achieve clean and homogeneous surfaces. Most of the steels are pickled at least once, usually several times. Strong mineral acids are commonly applied as pickling media. For stainless steel pickling, usually mixtures of nitric acid and hydrofluoric acid -so called mixed acids -are applied. Due to the chemical reaction, an enrichment of the pickling medium with detached scale particles, dissolved metal salts (bound acid), as well as a depletion of active acid (free acid) takes place. In this way, the pickling medium loses its effectiveness and must be replaced or refreshed. This causes significant emissions of acidic waste streams, which need to be treated to comply with regulations. The waste streams contain considerable amounts of dissolved heavy metals, nitrates, and free acid. Commonly, precipitation neutralization is applied; however, this leads to a loss of the dissolved valuables. Furthermore, significant amounts of neutralization sludge are generated, which need to be disposed of, as they constitute hazardous wastes. For both environmental and economic reasons the loss of valuables should be avoided. For this reason, pickling media are continuously regenerated in modern pickling lines. The focus may be on acid recovery onlythis is referred to as partial regeneration -or on a combined acid and metal recovery -this is referred to as total regeneration.

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Membrantrennverfahren

Lerch

2017

Hartinger Handbuch Abwasser- Und Recyclingtechnik

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Characteristics and Production Mechanism of Sulfuric Acid and Nitric-Hydrofluoric Acid Pickling Sludge Produced in Manufacture of Stainless Steel.

Cited by 11 publications

References 2 publications

Characterization of stainless steel pickling bath sludge and its solidification/stabilization

Characterization of stainless steel pickling bath sludge and its solidification/stabilization

Sustainable stainless steel – A review on acid regeneration systems for application in continuous pickling lines

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