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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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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.

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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Accordion

  • Cyanide destruction

    In conjunction with Solvay Interox we offer cyanide destruction technology using copper catalysed hydrogen peroxide and Caro’s acid.
  • Assisted leaching using peroxide

    Gold dissolution using cyanide requires the presence of an oxidant and invariably the oxidant used is dissolved oxygen. In a typical CIL or CIP agitated leach operation the oxygen is provided by compressed air or oxygen addition. In heap leach operations the oxidant is usually the air present in the heap. In any cyanidation process it is crucial to have both cyanide and an oxidant, in the conditions prevalent in most cyanide plants the rate of gold extraction is controlled by the dissolved oxygen content of the pulp. The addition of peroxide at the start of the leach process can improve the kinetics and recovery of gold and we can supply a tried and tested system to optimize peroxide addition.
  • Cyanide sparging

    We have been closely involved in introducing Orica’s cyanide sparge technology into West Africa. This procedure has advantages in both safe delivery to the Minesite and avoiding disposal of packaging material on the Minesite.
  • Total supply package

    We have been involved in total reagent supply packages for a number of mines in remote locations, these include, Bulyanhulu in Tanzania, Bisha in Eritrea, Sabodala Mine in Senegal, Twangiza in the Democratic Republic of the Congo, Karma Mine in Burkina Faso and a number of mines in Zimbabwe. For these mines we supplied the major part of their reagent requirements during commissioning and for the early stages of operation.

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