Inspection services to the steel industry include safe full loading and discharge supervision of hot and cold rolled steel coil, finished and semi-finished steel products. Inspection services determine the quantity and quality of steel products either by weighing, sampling, testing and measurement or through visual observation. Depending on contract terms, supervision services include weight determination at load and discharge shore scales or by draft survey, hold and visual inspection, tally and grading.
Scrap and Recycled Metals
Alex Stewart International can provide quantity and quality certification for ferrous, non-ferrous, electronic or plastic scrap material. This certification conforms to all contractual terms, conditions and also includes all international regulations such as ISRI and GOST.
Digital photographic evidence will be provided for all Pre-shipment Inspection and Proof on Arrival for scrap metal inspections, inspection during loading and sealing of containers.
Radioactivity testing and checking for the presence of hazardous or dangerous materials will also be rigorous to protect you from any unnecessary financial or environmental claims.
- Steel scrap: radioactive certification, quantity determinations by draft and barge survey, quality assessment to contractual or international (ISRI) guidelines, off grade and dust/dirt assessments, density assessments.
- Steel products: pre-shipment quality inspections, tally, loading and discharge supervision, mill test certificate approval, physical and chemical tests.
- Pig iron : loading and discharge supervision, weight determination, broken ingot assessment, sampling and chemical analysis.
Inspection services for steel, scrap and recycled metals are carried out by Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti.’s network of offices in Africa, Americas, Asia, Australia and Europe.
Solid Fuels – Coal and Coke
Full Inspection and Analytical Services
Through Alex Stewart International's operations network, Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti. provides the full range of coal and coke inspection and analytical services on a global basis.
Quantity and quality inspection and certification services for all solid fuels including both supervision of loading and discharge, sampling and size analysis, stockpile control, moisture tests and sample preparation are carried out in accordance with all international standards.
Analytical procedures are determined in triplicate, tailored to customers’ requirements and would include ash fusion, mineral, sulphur and ultimate analysis, chlorine and fluorine, hard grove grindability, roga and free swelling indices.
Analytical Services
- Moisture
- Ash
- Volatile matter
- Calorific value
- Fixed carbon
- Sulphur
- Phosphorus
- Silica
- Iron
- Alumina
- Chlorine
- Flourine
- Calcium oxide
- Managenese oxide
- Titanium Oxide
Mining Services & Geochemical Analysis
Comprehensive Geochemical Services
Through Alex Stewart International's operations network, Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti. provides mining, geochemical, environmental, metallurgical and analytical services to the mining and mineral exploration industry in Africa, Europe, South America and Asia.
Analytical Services;
- Preparation
- Fire Assay
- Dissolution
- Fusion
- Trace level analysis
- Drill core analysis
- Calcinations
- Environmental analysis
- Solid and liquid brines
- Mineral processing
- Metallurgical testing
- Sample storage and custody
Instruments and Methods
- Atomic absorption spectrophotometry –AA
- Multi element emission spectrophotometry by Argon Plasma – ICP
- Mercury determination by cold vapor
- Gravimetric determinations
Mine Site Laboratories
Alex Stewart International is able to design, install and staff laboratories for major exploration projects at mining sites almost anywhere in the world.
Standards
Laboratories are accredited to ISO 9001, 14001 and 17025 standards and participate in inter-laboratory tests and international round robins.
Precious Metals
Analytical, Sampling and Inspection Services
Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti. provides analytical, sampling and inspection services at major precious metal refineries, in conjunction with Alex Stewart International's network of offices in Africa, the Americas, Asia, Australia and the Far East.
Inspection services include weighing, representative sampling and supervision of melting at the refinery or bonded warehouse.
Analytical Services for precious metals utilise classical chemistry methodology, gravimetric titration, fire assay, Atomic Absorption, ICP and XRF.
Precious Metals include:
- Bullion
- Catalysts
- Concentrates
- Electronic Scrap
- Jewellery
- PGM
- Sweeps Slimes
Jewellery and Gold Testing
Through Alex Stewart International's operations network, Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti. will weigh, test and analyse any gold or precious metal containing jewellery, including earrings, bracelets, necklaces, rings, fillings, chains, watches, pendants, coins, sovereigns and Krugerrands.
Tests are determined by XRF, which provides a scan analysis by measuring the intensity of the gold x-rays by wavelength dispersion analysis. Our tests are non-destructive and minimal sample preparation permits very fast turnaround times.
When testing is complete, a full report indicates the percentage of gold content as well as other alloying metals such as copper, silver and zinc. Having tested for gold, we will email you with an official certificate of its content and return your sample.
Ferro Alloys, Minor Metals and Rare Earths
Accurate Independent Analysis
Through Alex Stewart International's operations network, Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti., provides a complete service of independent accurate analysis for ferro alloys, minor metals and rare earths.
Analysis can be combined with our representative sampling and inspection services, which are carried out through Alex Stewart International's network of offices in Africa, the Americas, Asia,Australia and Europe.
Complete sampling and analysis is available for:
- Antimony
- Bismuth
- Cadmium
- Chromium
- Cobalt
- Indium
- Magnesium
- Manganese
- Molybdenum
- Nickel
- Niobium
- Rhenium
- Tantalum
- Titanium
- Tungsten
- Selenium
- Silicon
- Vanadium
Inspection Services
A comprehensive range of inspection, weighing, sampling granulometry, sample preparation and analytical services is provided for minor metals, noble and bulk ferro alloys including ferro-chromium, ferro-molybdenum, ferro-titanium, ferro-tungsten and ferro-vanadium.
Minor metal certification includes antimony and bismuth, manganese, selenium and cadmium, tantalum and niobium, cobalt, indium and titanium.
Base Metals, Ferrous Ores and Concentrates
Accurate Independent Analysis
Alex Stewart Denetim ve Analiz Hizmetleri Ltd.Şti, provides the complete service of accurate independent analysis for base metals, ores and concentrates. Analysis is performed by classical wet chemistry techniques, combined with state-of-the-art high-tech instrumentation including Atomic Absorption, ICP, Carbon Sulphur and XRF.
Analysis can be combined with our representative sampling and inspection services, which are carried out through Alex Stewart International's network of offices in Africa, the Americas, Asia, Australia and Europe.
Complete sampling and analysis is available for:
Inspection and Sampling Services
Our strategically located inspection operations cover all of the world's major load and discharge ports and refineries for base and non-ferrous metals, including all leading South American, Asia Pacific and European ports, refineries and warehouses. Services include full inspection, draft survey, transportable moisture limits, shore scale or belt weighing surveillance, stockpile control and sampling.