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

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Acid Plant Database  May 6, 2020

Owner JSC Almalyk Mining-Metallurgical Complex (AMMC)

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Tashkent region
Republic of Uzbekistan

The Almalyk ore mining area is in the south of the Tashkent Region of the Republic of Uzbekistan, in the north-west part of the Kuraminsky range's foothills,on the left bank of the Angren river (the right tributary of the Sir-Darya river). The area occupies 850 sq.km. The area's industrial center is the town of Almalyk, 65 km of the city of Tashkent.   The area is connected by a road. Railway communication is made through the Ahangaran Station.

Background 1949 - Originally Almalyk Copper-Molybdenum Complex
1997 - Transformed into a Joint Stock Company (JSC)
Website www.agmk.uz
Plant -
Coordinates* -
Type of Plant Metallurgical
Gas Source Zinc
Plant Capacity -
Status Operating
Year Built 1970
Technology -
Contractor -

Increased demand for zinc is due to the growing needs of his automotive and engineering industries as well as in the production of household appliances.JSC "AMMC" as a link of the production chain enterprises, there Zinc smelter.

 The plant was commissioned in September 1970. production capacity is up to 120 tons metallic zinc in the year. It was designed to process 20-25 tonsown production of lead-zinc deposits, fulfills combine, and up to 100 tonnes - From imported concentrates.

Raw material base served ore deposit "Kurgashinkan" and "Altyntapkan" which is treated in the lead - concentrator.

In   1970. September 30 received the first pig zinc, three weeks later, on October 22, was first obtained by cadmium. During these years, construction began the third stage of the plant - a complex veltstseha to receive and processing fumes of zinc, lead and cadmium. With the completion of construction and commissioning 29 June 1972. first large veltspechi was discontinued warehousing zinc cakes, and work has begun to engage them in production.

Implementation of the nation's first new stage-three purification schemes zinc solutions of impurities provides high-quality zinc electrolyte. As a result, improved the quality of cathode zinc increased extraction of zinc and cadmium.

Thanks to the staff of the plant were utilized in 1973. Issue copperas and getting rare metal - India, an important raw material for the needs of the national economy.

In 1975. were completed the construction and commissioning of the works in full design technology. Reconstruction and expansion was completed in 1982.

First tolled materials plant began to process in 1992. In 1997. - He worked mainly on imported raw materials, tolled.

After working the field "Kurgashinkan" and stop delivery of ore deposits "Altyntapkan" in 1998 lead-zinc concentrator was transferred for processing copper-molybdenum ore, currently under tolling plant for processes zinc concentrates imported from the CIS and other foreign countries .

In accordance with the resolutions of the President of the Republic of Uzbekistan № PP-442 of 10.08.2006 "On the efficient use of mineral resources base of polymetallic ore deposits Khandiza and Uch-Kulach" and the number of PP-1166 from 16.07.2009, in September 2010 was commissioned GOK "Handiza". The first batch of zinc concentrate at the plant came in November 2010, and in December of the same year was received first own zinc.

At present, the plant recycles both own and imported zinc concentrates.  Besides the plant produces zinc metal cadmium, sulfuric acid, zinc powder, zamak and zinc sulphate technical for their own needs, as well as  clinker copper and copper cake for the smelter.

As part of the plant has the following departments: 

1 . Roasting shop equipped fluidized bed furnaces, which are candle products of zinc concentrate and sulfur dioxide to sulfuric acid. 

2. Shop leaching equipped reactors and thickeners, processes calcined zinc calcine and veltsokisly to give zinc-containing solutions for zinc metal. Shop leaching consists of sections: classification zinc calcine; neutral cinder leaching and thickening pulp; veltsokislov processing; copper-cadmium neutral solution purification from impurities and low-pass filtering by web drains thickeners and disc vacuum filters.

3. Electrolyte shop equipped   baths for  zinc electrolysis neutral solution,   ovens ICC-40 and ICC-12. Production plant is zinc metal. Electrolyte compartments plant comprises: a centralized vacuum evaporative cooling, zinc electrolysis, cathode zinc smelting; zinc dross processing a portion for the preparation of zinc dust and powder as well as an anode-cathode workshop.

4. Waelz shop equipped   rotary kilns size 50x3, 6m, recycles zinc-containing filter cakes. Shop products are copper and veltsokis clinker. Veltstseh consists of filtering and drying department, raw material warehouse, heating compartment dedusting system, firing department, installation manganese ore grinding.

5. Cadmium workshop , recycles copper-cadmium leaching cake shop and gets cadmium metal and copper cake. Cadmium workshop consists of offices leaching, cementation and dissolution of cadmium sponge, electrolysis of cadmium, cadmium and melting cathode area to obtain technical zinc sulfate.

6. Sulfuric acid plant , recycles waste gases roasting plant to produce sulfuric acid. The plant consists of washing, drying and absorption, contact offices and warehouse of finished products.

The smelter will also include support units:

Energy plant, which provides zinc production of electricity, compressed air, steam and water;

Mechanical repair shop;

Chemical Laboratory;

Transport and economic service

General JSC "Almalyk MMC" is an industrial complex combining 4 mines, 2 concentrators, 2 smelters with sulphuric acid installations, repair-mechanical and limestone extracting works, an Automobile transport Board, industrial railway transport Board and also 22 auxiliary shops and divisions. The Complex employs up to 25 295 workers of various qualifications. The copper-gold-molybdenum productive facilities are represented by the operating open-pits of Kalmakir, Sari-Cheku, by the Chadaksky and Angrensky mine managements, by the Kauldy mine, copper concentrator and copper smelter with its sulphuric acid installations.
The lead-zinc production line is represented by the Uch-Kulach mine with its stripping operations and by the zinc smelter with a sulphuric acid producing plant integrated. Zinc concentrate supplies are provided from abroad.
The produced products are realized in both the Republic of Uzbekistan and abroad and the share of exported products is about 70%.
References -
News The capacity of sulfuric acid production in Uzbekistan will increase by 1.4 times, from 950 metric tons to 1,300 metric tons per year by 2020, according to the decree of Uzbekistan’s Cabinet of Ministers.  The government decree envisages increasing the capacity by constructing new sulfuric acid producing facilities (with capacity of 650,000 metric tons per year each) at Ammofos-Maxam JSC and Navoi Mining and Metallurgical Combine.  It is planned to commission the facilities at Ammofos-Maxam and Navoi Mining and Metallurgical Combine in 2018 and 2019, respectively.  Meanwhile, the outdated facilities for sulfuric acid production will be decommissioned at Ammofos-Maxam (with capacity of 500,000 metric tons per year) and Navoi Mining and Metallurgical Combine (450,000 metric tons per year).  It is planned to finance the projects with the own funds of the Uzhimprom State Joint Stock Company, Uzbek Fund for Reconstruction and Development, loans from local and foreign banks, own funds of Ammofos-Maxam and Navoi Combine.  However, the cost of the projects is not specified in the government decree.  The general contractors for construction of the facilities on a “turnkey” basis will be determined through closed tenders.  Ammofos-Maxam JSC, commissioned in 1969, is the largest of the three chemical enterprises producing phosphate fertilizers in Uzbekistan. The design capacity allows to produce over 338,000 metric tons of ammophos, 500,000 metric tons of sulfuric acid and 417,000 metric tons of wet-process phosphoric acid per year.  Spanish MAXAM Corp. obtained 49 percent of the enterprise’s share for $18 million and investment commitments worth $30 million in January 2008. The state is the owner of 51 percent of the block of shares.  Navoi Mining and Metallurgical Combine is one of the largest gold producers in Central Asia. The combine is fully owned by the state. The annual production volume nears $2 billion.

March 4, 2014
- An accident at the Almalyksy chemical plant led to the spill of about 1,200 kg of sulfuric acid.  According to employees of the Almalyksy chemical plant, the accident happened either on February 27 or 28.  The plant's management has concealed the accident from the public and its site is heavily guarded.  According to a plant employee, the accident is a result of an overturned tanker carrying 600 liters of acid (1,200 kg).  It was not possible to isolate the spill as most of it seeped into the soil, thus polluting ground waters as well.  Another employee told Uznews.net that there have been no injuries among the plant workers and environmental damage assessments have already been performed.  He believes that the results of the environmental impact study show little to be concerned about; neither are there any damages to local residents and farm animals.  However, rumors have spread among local residents about the sudden death of people and animals.

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