Products

Select product or services name to read more about each one.

Since 1987 Nowata have supplied over 300 000 tonnes of sodium cyanide into Africa. As an integral part of the supply package we train the mine personnel and transport company staff in the safe handling of cyanide and how to deal with an accidental spill. We assist clients to establish an Emergency Response Plan to ensure that an incident anywhere in the supply chain is dealt with quickly and efficiently. All transportation from the cyanide production facility is carried out by ICMC registered companies. We operate our own dedicated incinerators in Ghana and Burkina Faso which are EPA approved for the destruction of cyanide waste packaging.

We are able to supply cyanide in drums (50kg), boxes (1000kg) and sparge containers (+ / – 20 tonnes). The benefit of sparging is that the cyanide is dissolved directly from the bulk container on the mine and no handling of solid cyanide is required. Furthermore there are no packaging disposal problems on the mine.

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Nowata supply a range of anionic, non-ionic and cationic flocculants from SNF Floerger who are world’s largest water soluble polymer manufacturer. We have Chemists and Metallurgists who are experienced in laboratory testwork and the scale-up of these results to plant operation. We have developed products which are unique to Nowata and are specifically manufactured by SNF for Nowata as a direct result of our testwork programmes. We also supply SNF’s range of “polyamine” and “polydadmac” coagulants.

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Flotation Chemicals

Nowata personnel are actively involved in the manufacture and supply of flotation reagents. These can be conveniently divided into the following categories.

Collectors and Promoters

Nowata purchase various xanthates from manufacturers in both South Africa and the Far East. As well as the standard xanthate homologues of ethyl, propyl, butyl and amyl, Nowata supply mixed xanthates in conjunction with other collectors.

As well as xanthates which are still used as the primary collector in most mines we have a range of dithiophosphates, dithiocarbamates, xanthogen formates and xanthic esters. We have developed a customized range of blended products which have application in the gold, base metal and platinum industries and have been shown to give improved recoveries particularly where rapid oxidation may occur. These blended products have been shown to be capable of replacing both primary and secondary collectors.

Frothers

We have a range of frother blends which utilize, alcohols, glycols and glycol ethers which can be supplemented using reagents having both frothing and collecting properties. As well as blending our own products we purchase MIBC and DMP from other manufacturers.

Nowata have assisted a local Ghanaian company (AfriChem) to develop a range of frothers for the West African market and these are being blended in Ghana.

Activators

We supply both Copper sulphate and Lead nitrate as activators. The former is used in gold and PGM circuits and the latter in stibnite flotation. We supply sodium hydrosulphide which is used to activate tarnished sulphides.

Depressants

We have a range of guar based gangue depressants, toll manufactured to our specifications. These have been used in the depression of naturally hydrophobic gangue minerals in base and precious metal operations in Africa and Australasia. We also have access to a range of carboxymethylcellulose derivatives which have a similar action to the guar’s and can often be used interchangeably, the choice often depending on reagent cost.



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Viscosity Modifiers

We represent Pionera (www.pionera.com) in various countries in Africa and we are studying the efficacy of their biopolymers in viscosity modification, flotation and leaching applications. Pionera have developed a range of unique products based on substitution of a hydroxyphenyl propane monomer. The properties of the products vary depending on the degree and type of substitution. In Africa where many of the new projects are treating oxidized ores, often with a relatively high clay content these polymers are able to assist with plant throughput and leaching efficiency.

Dust Control Agents

Lignosulphonate binder which efficiently supresses dust generation on haul roads and waste dumps. Non-toxic, environmentally friendly and easily applied.

Smelt House Chemicals

We supply the various chemicals required in the smelting of gold as part of our overall supply package. Typically borax, anhydrous and the decahydrate, sodium carbonate, sodium and potassium nitrate, silica and fluorspar are supplied.

Commodity Chemicals

In support of our range of performance chemicals, we supply many of the commodity chemicals required by the mining industry. Examples being, caustic soda, hydrochloric, nitric, sulphamic and sulphuric acids, quicklime and hydrated lime.

Sodium Metabisulphite

As an alternative to hydrogen peroxide or Caro’s acid a number of mines prefer to use sodium metabisulphite as the oxidant in the cyanide destruction process. This is used in conjunction with copper ions, supplied by the addition of copper sulphate. Some plants use hydrogen peroxide together with the sodium metabisulphite as a supplementary oxidant.

Hydrogen Peroxide

Hydrogen peroxide from Solvay Interox acts as a leach enhancer during cyanidation and is used to treat plant effluent for cyanide removal with copper ions as the catalyst. In applications where high usage is encountered we supply 70 per cent peroxide in 25 tonne ISO-containers. For other applications we supply 60 per cent peroxide in 1200 kilogram IBC’s.

In conjunction with Solvay we can supply automatic dosing systems to feed from either IBC’s or ISO-containers and Caro’s acid units for cyanide destruction.

Antiscalants

Nowata’s proprietary technology is licensed within Ghana for the manufacture of antiscalants for the West African mining industry.

These antiscalants are used in CIL and heap leach plants to control scaling. There are high temperature products for use in the elution circuit.

Most scale control is geared to calcium carbonate deposits, increasingly calcium sulphate scale is encountered in some operations where cyanide detoxification is accomplished using sodium metabisulphite. This is controlled by a specially formulated product.

Activated Carbon

Nowata has supplied activated carbon to the mining industry for almost 30 years. For many years we supplied carbon from a third party but for the past five years, we have worked closely with Core Carbon from India to develop a carbon suitable for the gold industry that has superior attrition resistance, activity and a very low platelet content. Our customers benefit from a comprehensive laboratory service where carbon activity, particle size and both organic and inorganic fouling are monitored on a regular basis. This enables the plant personnel to track carbon performance on a progressive basis, quickly identifying problems and take appropriate remedial action.
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