Stainless steels pickling

The balance of hydrogen fluoride is used ia appHcations such as stainless steel pickling inorganic fluoride production, alkylation (qv), uranium enrichment, and fluorine production. Hydrogen fluoride is used to convert uranium oxide to UF which then reacts with elemental fluorine to produce volatile UF. ... [Pg.138]

Reduce nitrogen oxide emissions by use of natural gas as fuel, use low-NO, burners, and use hydrogen peroxide and urea in stainless steel pickling baths. [Pg.129]

Wet air pollution control (WAPC) devices are used to treat exhaust gases from stainless steel pickling operations, thereby generating wastewater, which are treated using the selective catalytic reduction (SCR) technology in which anhydrous ammonia is injected into the gas stream prior to a catalyst to reduce NO, to nitrogen and water. The most common types of catalysts are a metal oxide, a noble metal, or zeolite. [Pg.68]

High ceiling diuretics, 5 169 High chrome-nickel stainless steels, pickling, 16 223... [Pg.433]

Nitric Acids from Stainless Steel Pickling Baths... [Pg.628]

The general proeedure to remove monovalent acids from the aqueous solution by adding sulfurie aeid and then extracting the released acids with an organic donor molecule, dissolved in an organic diluent, has been called aeid exehange or the AX proeess [15,16]. The procedure was first presented for the treatment of spent stainless steel pickling liquids. The process consists of three main steps (Fig. 14.10) ... [Pg.628]

Similar extraction procedures [17] using a mixture of trialkylphos-phine oxides (CYANEX 923) for extraction of the mineral acids from electroplating and stainless steel pickling baths are reported as the ARSEP procedure. [Pg.628]

Fig. 14.10 Recovery of acids from stainless steel pickling baths.

Uses are for fluorocarbons (66%), alumina (14%), petroleum alkylation catalysis (4%), stainless steel pickling (4%), and uranium chemical production (2%). [Pg.242]

Constrained only by the ability to condition the solution to the guideline levels of conductance and contamination, the AQUATECH System is a versatile unit operation in a wide variety of industry areas. In addition to our commercial stainless steel pickling acid recovery plant and the specialty metals waste recycling described above, AQUATECH Systems has developed and patented numerous other process schemes including ... [Pg.280]

AQUATECH Systems first commercial application is recycling waste HF/HNO- steel pickling acid as shown in Figure 7 above. As described earlier, the acid is neutralized with KOH to pH 10-11, filtered and sent to the AQUATECH cellstack for regeneration. The KF/KNO, mixed salt produces an HF/HNO, mixed acid suitable for stainless steel pickling Jand an equivalent amount of KOH used to neutralize the next batch of waste acid. The water balance is maintained by conventional electrodialysis which rejects excess water from the KF/KNO salt. This water is... [Pg.284]

Stephenson, J. B., J. C. Hogan, and R. S. Kaplan, 1984. "Recycling and Metal Recovery Technology for Stainless Steel Pickling Liquors." Environ. Prog. [Pg.319]

FIGURE 43 Bipolar membrane processes for (a) S02 removal from stack gases and (b) stainless steel pickling bath waste acid regeneration. [Pg.394]

Rinse water regeneration in stainless steel pickling. Desalination, 211 (1-3), 64-71. [Pg.349]

Table 21.13 reviews the (known) different plants installed worldwide with above membranes and the corresponding estimated membrane area. The first bipolar system was delivered in 1986 to Washington Steel in Pennsylvania for the recovery of hydrofluoric and nitric acids from stainless steel pickling liquor and the most recent one has been installed in China for the production of an organic acid. In the last few years, some of the plants in operation in the United States have been closed due mainly to overall plant shutdowns, product line changes, or other economical reasons. [Pg.623]

With the war years, polyvinyl chloride (PVC) resins came under study, and plasticized PVC compounds, based on these resins, became available as calendered sheet lining materials-the material of choice for stainless steel pickling and for chrome plating and other exposure employing mixtures of chemicals including such strong oxidants as nitric and chromic acid which rapidly attack natural rubber. (A higher temperature limit modification now seldom seen is PVDC, for which the continuous temperature limit is said to be 170°-180°F.)... [Pg.121]

Spirits of wine - 784, 836 Stackfas mastic - 210 Stack gases -711 Stack gas scrubbing - 210 Stainless steel pickle - 210 Standard Oil Mobilube - 365 Stanisol - 235... [Pg.956]

N. J. Sanders, Environmentally friendly stainless steel pickling. Anti Corrosion Methods and Materials, 44, 20-25 (1997). [Pg.226]

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