Milling additives Question 5

We at our plant intend to utilise high sulphate resistant cement for oil well cement. To produce low viscosity and slow-setting slurry we need to know the type of most suitable retarder and friction reducing additive to be used with SRC.

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Re: Milling additives

The key to producing oil well cement lies in the testing and meeting of the API performance specification. A high sulphate resisting cement with low C₃A content may well be a good starting point. Lignosulphonate is likely to be a useful retarder and friction reducing agent for this application.

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Milling additives Question 6

I wish to know which are the problems we may face if we start using phosphogypsum as a set retarder in manufacturing OPC. Currently, we are adding 3.5 per cent of natural gypsum in the finish mill.

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Re: Milling additives

I recommend that you conduct trials with the phosphogypsum replacing natural gypsum, however there is reported experience from India and South Africa that this can be done. I would recommend researching the work conducted by the University of Pretoria in conjunction with Pretoria Portland Cement in South Africa.

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