sulphuric acid recycling Articles

  • Exergy analysis of the process of wet-process phosphoric acid production with full utilisation of sulphur contained in the waste phosphogypsum

    The wet-process phosphoric acid is produced by decomposition of phosphate raw materials with sulphuric acid. This gives a large amount of waste product-phosphogypsum. The thermochemical decomposition of phosphogypsum gives a gas rich in SO2. This gas is processed to obtain sulphuric acid, which is fed back into phosphoric acid production. The aim of this paper is to perform exergy analysis of the ...


    By Inderscience Publishers

  • Acid recycling in steel pickling plants: state-of-the-art and new developments in environmental protection

    For acid pickling of heat-treated mild steel and steel products for up to the middle of the last century, sulphuric acid was primarily in use, which has been replaced since the 1960s stepwise by hydrochloric acid. During this time, also the pickling of high alloyed steel with hydrofluoric acid or mixtures of hydrofluoric acid together with nitric acid has been applied on industrial scale. The ...


    By Inderscience Publishers

  • Recovery and Recycling of Chrome Liquors: VHSP Pty Ltd

     VHSP Pty Ltd built its tanning plant in 1987 using the Sirolime process, which delivered significant improvements in environmental performance over conventional processes. The company implemented further cleaner production initiatives relating to recycling of chrome tanning liquors that have achieved annual savings of $314,000 with a payback of 0.4 years. Background ...


  • Wastewater from car batteries disposal

    The Client Our Client is a secondary lead smelting plant, based in Europe, that produces mainly lead ingots for automotive car batteries, lead alloys and lead shot for hunting and sport shooting. The Challenge The Client has a recovery plant for lead acid batteries, capable of separating the different components of batteries by wet system, with ...

  • A.E.S. 1977 paper to with plating emission problems

    A.E.S. PAPER The following paper has NOT been altered whatsoever. Some notes a) A.E.S. stands for American Electroplating Society. b) the mention of l¼ million cfm is now incorrect as it is well over 3 million cfm c) The Grandview E.C.E. scrubber is a condensed name for Eliminate, Coalesce, Eliminate …. and this design is called by various names such as LMS …low micron scrubber and LMITS …low ...


  • From Waste in Anodising Plant to New Chemical Product in Sewage Treatment Plants

    Aluminium containing caustic soda used as a pickling agent in the pre-treatment of aluminium before anodising and aluminium containing sulphuric acids used as electrolytes for the formation of oxide layers in anodising plants can be utilised in municipal sewage treatment plants to reduce phosphates and improve precipitation. From the anodiser's point of view, these products are spent once they ...


  • Case study: How to purify Hexavalent Chrome Wastewater

    We all talk about priority pollutants, about hazardous substances and discharge to the atmosphere etc. which are dangerous for our environmental. Day by day we adopt new laws and regulations to protect our green future. So, what is that “priority pollutants”? Priority pollutants are highly toxic chemicals. The list of these chemicals is quite large and includes thousands of items but ...


    By PC GlobeCore

  • Bioremediation of Effluent the Pulp and Paper Industry

    The treatment of industrial effluent from the paper manufacturing facilities in British Columbia is a major concern because the effluent is discharged into prime salmon habitat in the marine environment (Cross, 1994). High levels of biological oxygen demand (BOD) in the effluent reduce the dissolved oxygen (DO) available to species in the marine environment. In 1988, the Federal Department of ...


  • A matter of refinement

    With over 1.2-billion litres of finished lubricants sold in Canada each year, the environmental importance of managing the associated waste stream is significant. Used oil, if not handled properly, can result in contamination and major environmental damage. In fact, according to Alice Chung, regional manager in charge of Newalta's North Vancouver facility (one of only two used oil re-refineries ...

  • Heat Pump Used to Drain Contaminated Sludge in a Steel Factory

    Summary In 1987, new regulations required that factories dispose of their contaminated water and waste themselves. Making galvanised steel wire, the Stelfil factory produces sludge contaminated with lead and zinc. Stelfil spent thousands of dollars to bury this waste and evaluated three systems to remove most of the water: a gas dryer, an induction heated screw conveyor and a heat pump system. ...


  • One of Europe’s most contaminated sites

    VSD Avenue, a joint venture partnership between VolkerStevin, DEC and Sita Remediation, started work at the beginning of September on the remediation of the former Avenue Coking Works in Chesterfield; one of the most heavily contaminated sites in Europe. Guy Pomphrey, chairman of VSD Avenue, explains The £82m contract, signed in July, was commissioned by the client and site owner the East ...


    By Newzeye Ltd

  • Eco-Industrial Development: The case of the United States

    Issue: Businesses, local government and community groups are all seeking new answers for how to assure greater compatibility between environmental and economic opportunities. One possible contribution to meeting this challenge is a new phenomenon capturing the imagination of those concerned with responsible economic development in the United States. This phenomenon is known by various names, ...


  • Recovery of Ruthenium and Other PGMs from Spent Petrochemical Catalysts

    The recovery of platinum group metals from spent petrochemical catalysts has economic benefits by the protection of the supply chain of these valuable and rare metals, thereby helping to create a sustainable value chain in the petrochemical industry for catalysts. Introduction The platinum group metals (PGMs) are used extensively in catalysts for the petrochemical industry owing to ...

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