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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Acid Plant Database  July 4, 2015

Owner Boliden Kokkola Oyj

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Outokummuntie 8

Finland  67101

PL 74
Finland  67101
Background -
Website www.boliden.se
Plant -
Coordinates* 63° 51' 50" N, 23° 3' 16" E (Site)
Type of Plant Metallurgical
Gas Source Zinc
2 x 72 m2 Fluid Bed Roasters
Hot Gas Cleaning Waste heat boiler - Cyclone - Hot ESP - Fan
Wet Gas Cleaning Sulphating Tower - Weak Acid Tower - Washing Tower - WESP - Halogen Tower - WESP

Mercury Removal
- 1st stage - sulphating tower - weak acid (33-36% H2SO4) tower with chloride and selenium solution (60oC)
- 2nd stage - washing with chloride and selenium solution (process conditions are different then 1st stage)

Plant Capacity -
Status Operating
Year Built 1969
Technology -
Contractor -
Remarks - Off-gas from roasters are fed to a sulphuric acid plant operated and owned by Kemira Oyj
- Mercury Removal System: Acid product quality < 0.05 ppm Hg

Zinc Production: 306,000 MTPA
Boliden Kokkola on the west coast of Finland is the second largest zinc plant in Europe and the fifth largest in the world. The main products are special high-grade (SHG) zinc, the purity of which is a minimum of 99.995 per cent according to the classification of the London Metal Exchange, and zinc alloys.
Boliden Kokkola is the largest private employer in Kokkola and gives work to approximately 620 professionals in the zinc field.
Production started in 1969. After roughly three decades and four extensive expansions, the production capacity of the zinc plant has more than quadrupled to 306,000 tons.
The most important goals in the development of process techniques are efficiency, profitability and focus on environmental effects. At Boliden Kokkola efficient production and respect for the environment walk smoothly side by side.
The Management System of Boliden Kokkola comprises three international standards: the Quality System ISO 9001:2000, the Environmental System ISO 14001 and the Occupational Health and Safety Management System OHSAS 18001.

The Boliden Group is a significant producer of sulphuric acid and has sulphuric acid plants at the Odda zinc smelter and the Harjavalta and Rönnskär copper smelters, producing a total of 1.1 million tonnes of sulphuric acid in 2009.

Boliden is a leading European metals company whose core competence is in the fields of exploration, mining, smelting and recycling. Boliden’s main metals are zinc and copper. Other important metals extracted and refined include lead, gold and silver. The operations are conducted in two Business Areas: Mines and Smelters. The number of employees is approximately 4 400 and the turnover amounts to approximately SEK 28 billion annually. Its shares are listed on NASDAQ OMX Stockholm, segment Large Cap and on the Toronto Stock Exchange in Canada.

References -
News April 30, 2010 - Boliden has acquired Kemira’s www.kemira.com sulphuric acid plant and business in Kokkola, Finland, effective as of 1st May 2010. The acquisition will enable Boliden to conduct its sulphuric acid manufacturing operations at Kokkola in-house, and thereby gain control over the entire process flow.  Sulphur dioxide is a by-product of both zinc and copper production. The sulphur dioxide can be refined to produce sulphuric acid, a chemical with a wide range of uses in numerous sectors, including the artificial fertiliser, pulp and mining industries. Boliden’s Kokkola zinc smelter in Finland has previously sold its sulphur dioxide to Kemira Oy, which has, in turn, refined the gas to produce sulphuric acid.  The sulphuric acid plant has an annual production capacity of approximately 300,000 tonnes and the majority of its production is sold to local companies, as well as to other industrial facilities in Finland. The existing contracts will be taken over in conjunction with the acquisition, which also includes installations, land and around 20 employees. The transaction will not have a significant effect on Boliden’s results. The parties have agreed not to disclose the purchase price.

January 30, 2009 - The prevailing weak market situation is causing Boliden to implement a reduction in copper metal production at its smelters in Sweden and Finland in the first quarter.  "This is an extreme situation that affects the whole industry, and it is hard to predict how the market is going to develop. The demand for copper and the by-product sulphuric acid is weak," says Svante Nilsson, SVP for Business Area Market.  The reduction, which will be implemented with immediate effect, will see copper metal production cut by approximately 17,000 tonnes in the first quarter of 2009.

MTPD - Metric Tonne per Day           STPD - Short Ton per Day
MTPA - Metric Tonne per Annum      STPA - Short Ton per Annum
SA - Single Absorption
DA - Double Absorption

* Coordinates can be used to locate plant on Google Earth