Sulfuric acid & ferrous sulfate recovery from waste pickle liquor by Joseph K. Seyler

Cover of: Sulfuric acid & ferrous sulfate recovery from waste pickle liquor | Joseph K. Seyler

Published by Office of Research and Development U. S. Environment Protection Agency in Washington .

Written in English

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StatementbyJoseph K. Seyler, William E. Thornton andMichael K. Householder.
SeriesEnvironmental protection technology series
ContributionsThornton, William E., Householder, Michael K., U. S. Environmental protection agency.
The Physical Object
Pagination71p. :
Number of Pages71
ID Numbers
Open LibraryOL20255415M

Download Sulfuric acid & ferrous sulfate recovery from waste pickle liquor

This paper demonstrates that spent sulfuric acid pickle liquor can be recycled by recovering sulfuric acid and ferrous sulfate. This is achieved by removing part of the water from the liquor followed by ferrous sulfate crystallization and separation of the ferrous sulfate from the resulting by: 7.

On an average, in85 percent of the sulfate components--abouttons of free sulfuric acid and abouttons of ferrous sulfate were discharged in the form of concentrated spent pickle liquor, containing about 60 grams/liter of free sulfuric acid and about grams per.

Anodic behaviour of stainless steel S in concentrated solutions of sulphuric acid. Corrosion Science45 (7), DOI: /SX(02)Cited by: 9.

Anodic behaviour of stainless steel S in concentrated solutions of sulphuric acid. Corrosion Science45 (7), DOI: /SX(02) When the dissolved iron and the sulfuric acid content of the pickling solution reach a predetermined level, it is pumped to the batch crystallizer.

The pickling tank is then immediately recharged with recovered acid from a previous batch, and pickling Size: 6MB. Anodic behaviour of stainless steel S in concentrated solutions of sulphuric acid. Corrosion Science45 (7), DOI: /SX(02) E.J Reardon, R.D Beckie. Modelling chemical equilibria of acid Cited by: 9.

Sulfuric acid is generally employed for pickling ferrous metals, although hydrochloric acid may also be used [1,2]. Pickling practices, the number of pickling tanks, the concentration of the sulfuric acid and the temperature of the pickle liquor vary from plant to plant and depend on the kind of steel processed [1].Cited by: 7.

In these plants, the ferrous sulphate accumulated in the acid is crystallized by cooling and separated as ferrous sulphate heptahydrate The pickling of mild steel sheets with sulfuric acid produces an aqueous waste stream containing ferrous sulfate and sulfuric acid.

source. For sulfuric acid pickle liquor, crystallization process is the most common method of acid recovery through removal of ferrous sulfate. For hydrochloric acid pickle liquor, the existing commercially proven technology is thermal decomposition. These methods are described in U.S.

EPA's Development Document for Iron and Steel Size: 27KB. The flows of ferrous sulfate and nitric acid in A or B, respectively are shut off and the resin beds are pulsed or shifted countercurrently. The valve above each rinse cycle is open while the resin is being pulsed.

The rate of resin flow is determined by the feed/resin flow ratio dis. In order to realize utilization of steel hydrochloric pickling waste liquor and recovery of hydrochloric acid and iron salts simultaneously, the combined technical process of salt-added.

The Sulfuric Acid Recovery System continuously recycles acid by removing these impurities and maintaining a high quality, high speed pickling solution, thus never allowing iron levels that will slow the production process.

Pickling acid is drawn from the tank and fed through a Pre-filter to remove suspended particles. Figure 7.

Modular Design of Sulfuric Acid Recovery Plant. Evaporative Recovery of Hydrochloric Acid. Recovery of hydrochloric acid from pickling liquors is different than sulfuric acid. The process can be describes as follows (see Fig. 8); 1.

After filtering the acid solution, it is fed to the evaporator. recovery from it. Keywords: Pickling liquor, conventional treatment method, Solidification and Stabilization (S/S), Regeneration and Recovery methods. Introduction Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, rust or scale from ferrous metals, copper, and aluminium alloys.

Polymeric ferric sulfate prepared by recyclable ferrous sulfate was accord with the first type of standard water clarfying agent polymer ferric sulfate(GB). Waste Steel-Pickling Sulphuric Acid Removal Treated by Freezing Crystallization-Acid Retardation Coupling Technology | hor: Jian Zhai, Chun Hua Jiang, Jian Wu.

According to p. of Fairlie, Sulfuric Acid Manufacture (ACS Monograph #69, published by Reinhold Publ. Corp.), the waste pickle liquor produced by titanium pigments plants will usually range in solution concentration from about 18% to 25% Cited by: Sulfuric acid and ferrous sulphate recovery from waste pickle liquor: Responsibility: by Joseph K.

Seyler, William E. Thornton, Michael K. Householder. Spent pickle liquor containing % ferrous sulfate and 4% sulfuric acid and pre-heated to 85 C. was passed continuously into the top of the cathode compartment.

The eluent from the bottom of the cathode compartment then passed continuously into Cited by: parts by weight of % sulfuric acid were added. The mixture was cooled and allowed to stand and was then filtered. The filtrate comprised regenerated acid of % strength and contained only % total iron.

The filter cake was ferrous sulfate monohydrate plus a small amount of mother liquor. Cite this chapter as: Heit A.H., Calmon C.

() Electrodialytic Recovery of Sulfuric Acid and Iron Content from Spent Pickling Liquor. In: Bier M. Author: A. Heit, C. Calmon. pickling with sulfuric acid. It also appears as a waste from some flue gas treatment processes [ 41 and slags solid state as FeSO.

7H20 after crystallization from the acid liquors. The composition of such liquors is up to g/!4 in iron(I1) sulfate and in free sulfuric acid in the case of titanium dioxide manufacture, and up to g/UFile Size: KB. An Ecologically Sound Solution to Dumping Waste Pickling Acid Bryan M.

Cullivan, president Beta Control Systems, Inc. Beta Control Systems, Inc. is a research and development corporation dedicated to the development of resource recovery equipment for Size: KB.

Recovery of valuable material: hydrochloric acid, zinc chloride and ferrous sulfate crystals The hydrochloric acid obtained – with a concentration of %, due to the azeotrope that is formed – is consumed in the surface treatment process, which means significantly less reagent is needed to be purchased, leading to savings.

— Spent pickle liquor from steel manufacturers is usually used to produce ferrous sulfate in the route of acid recovery. This work proposes a new process to be used industrially by which clean mill scale is used as raw material for the production of ferrous sulfate by acid leaching.

River with acid waste waters. treat any remaining waste waters. The acid William Hitchcock, Jr., president of Atlan- will be used over again. The ferrous sulfate tic Wire gives the following report on the crystals, looking something like rock salt, company's decision to be the first in the will be marketed, although the sales value.

Pickling Tank Recovered Acid Pickliq Process Ferrous Sulfate to Market Pickliq Process Introduction Sulfuric and hydrochloric acid are top-ranking wastes in the national Toxic Release Inventory.

Much of this waste comes from pickling liquors from the primary metals and metal finishing industries. A typical sulfuric-acid pickling operation. Page 1 of 6 Rev. 5/15 Spent Pickle Liquor (Spent Acid) SDS Section 1 – Identification Identification Used on Label: Spent Pickle Liquor (Spent Acid) Other names: Ferrous Chloride Solution., Waste Pickle Liquor, Waste Acid, Ferrous Metal Pickling Recommended Use: None Name, Address, and Telephone Number.

equivalent of the ferrous sulfate is recovered as re-usable sulfuric acid by simple chemical reaction, thus elimi nating the need for an expensive con tact or chamber sulfuric acid plant.

It is this feature that distinguishes the process from other previously proposed recovery processes. Recovered sulfuric acid is then returned to the pickler to. Spent Hydrochloric Acid. Pickle Liquor Sulfuric Acid Reactor Crystallizer Chiller.

Regenerated HCI Pickle Liquor. Ferrous Sulfate Heptahydrate Crystal Product for Sale. Green Technology Group's Pickliq technology brings dramatic savings to the steel industry. Here, spent pickling liquor is sent to a reactor, where sulfuric acid is added to.

Value Addition to Sulfate Waste Pickle Liquor of Steel Industry Using Hydrometallurgical Processes Article in Metallurgical and Materials Transactions. Ferrous sulfate has been researched extensively as a recovery product for waste sulfuric acid, for example, in the steel industry as pickle liquor recovery, Sulfuric Acid and Ferrous Sulfate Recovey from Waste Pickle Liquor by Thornton, W.

in US EPA ORD Series EON/ (01/00/94) and Recovery of Ferrous Sulfate and Sulfuric Acid. regeneration is based on the ability to crystallize ferrous sulfate from hydrochloric acid containing ferrous chloride by adding sulfuric acid to the spent picklingpurified hydrochloric acid is recycled back into the inventor’s process is thus a zero (waste) discharge process that in addition produces a File Size: KB.

by-product sales of ferrous sulfate heptahydrate crystals used for industrial purposes. The PHAR system recycles tainted hydrochloric acid/spent pickling liquor by sending it to a reactor, where sulfuric acid is added.

Iron and other pickling by-products are then removed with the help of a suitable filter or centrifuge. Also called, vitriol, ferrous sulfate, and copperas, the pure form of iron (II) A less pure form can be made from dissolving iron scraps or nails in a weak acid, and Alcohol may increase the rate of extraction for tannin, and may also have a.

Eight iron gall ink recipes, listed in Appendix A, were chosen for this experiment. Get Price. Ferrous sulfate appears as a greenish or yellow-brown crystalline solid. Density lb /gal. Melts at 64°C and loses the seven waters of hydration at 90°C. The primary hazard is the threat to the environment.

Immediate steps should be taken to limit its spread to the environment. Used for water or sewage treatment, as a fertilizer ingredient. The solvent extraction of concentrated acid was investigated from sulfate waste pickle liquors using Cyanex (trialkylphosphine oxide (TRPO); manufactured by Cytec Industries Inc., Woodland Park, NJ; provided by Cyanamid Canada Inc.

(Markham, Canada)) as an extractant. The effect of various parameters was studied such as extractant concentration, Cited by: 6. sulfate liquors. Steel is pickled by both batch and continuous methods.

In the batch method, the steel is suspended in the sulfuric acid solution for from 10 min. to more than 1 hr. The resultant liquor contains to per cent free acid and 15 to 22 per cent ferrous sulfate.

In the continuous method, steel strip from coils passes through a. The ferrous sulfate monohydrate, FeSOH/2HO, or with less water of hydration is the ferrous sulfate from which sulfuric acid can be more readily manufactured. Hence it is apparent that the process may be so operated as to produce the by-product.

hydrate is the preferred form of ferrous sulfate for manufacturing sul furic acid, because it can be roasted directly to liberate oxides of sulfur. Several procedures have been developed for producing ferric sulfate from waste pickle liquor (11).

The processes differ somewhat in par ticulars, but the principle in each is the oxidation of. After the acid is pre-chilled, it enters the Reactor where the spent pickle liquor is agitated and chilled further until the iron forms an iron sulfate crystal (ferrous sulfate heptahydrate).

The special thermoplastic heat exchangers immersed in the solution pass a refrigerant through the inner tubes that absorbs heat from the solution and Brand: Beta.

Recovery of iron from waste ferrous sulphate by coprecipitation and magnetic separation. The total ferrous sulphate production in China of iron ore tailings. Sulfuric Acid and Ferrous Sulphate Recovery from Waste. Sulfate Recovery From Waste Pickle Liquor ferrous sulfate, the iron oxide is production of ferrous sulfate has grown from.

Get price.Sulfuric Acid Recovery. This recovery/recycle system removes iron from the pickle liquor and returns clean acid to the pickle baths.

This process sends the pickle liquor to 55 degrees and as the temperature approaches, ferrous sulfate hepta-hydrate crystals begin to form.Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, rust or scale from ferrous metals, copper, precious metals and aluminum alloys.

A solution called pickle liquor, which usually contains acid, is used to remove the surface is commonly used to descale or clean steel in various steelmaking processes.

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