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Grog from Fired Clay
Clay

Yenziwe ngu-

Clay

11. uMfumfu 2026DK
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Grog from Fired Clay

Grog is clay that has already been fired and then crushed. Mixed into raw clay it opens the body, cuts shrinkage and cracking, and lets steam out as the piece dries and fires, which is why crucibles, kiln bricks and big pots are full of it. It is made by firing lumps of the same refractory clay, or by crushing broken unglazed pots.
Oqalayo
A day, plus a kiln firing

Imiyalelo

1

Make lumps

Wedge refractory clay into fist-sized lumps and let them dry completely.

Izinto zokwakha zalesi sinyathelo:

Ubumba Obumelana NomliloUbumba Obumelana Nomlilo10 kg
AmanziAmanzi1 ilitha

Amathuluzi adingekayo:

Umgqomo wokuxubaUmgqomo wokuxuba
2

Fire them

Fire the dry lumps in the kiln, raising the heat slowly at first so they do not burst.

Amathuluzi adingekayo:

IsithandoIsithando
I-pyrometerI-pyrometer
Izinto zangaphakathi zesithandoIzinto zangaphakathi zesithando
3

Crush

Put the cold lumps in a sack and break them with the sledgehammer; finish small pieces in the mortar. Wear a dust mask and glasses.

Amathuluzi adingekayo:

Isaka le-hessianIsaka le-hessian
Isando esikhuluIsando esikhulu
Isigqulo NomgquloIsigqulo Nomgqulo
Imaski YothuliImaski Yothuli
Izibuko zokuphephaIzibuko zokuphepha
4

Sieve into sizes

Sieve through the graded sieves and keep each size apart: coarse grog for bricks, fine grog for crucibles and thin pots. Re-crush what is too big.

Amathuluzi adingekayo:

Isethi yezisefo (izimbobo ezilandelanayo)Isethi yezisefo (izimbobo ezilandelanayo)
Imaski YothuliImaski Yothuli
5

Store dry

Store each size in its own lidded bucket, labelled with the clay and firing it came from.

Amathuluzi adingekayo:

Ibhakede lensimbi elinesivaloIbhakede lensimbi elinesivalo

Izinto

2

Amathuluzi Adingekayo

11

Le blueprint yenza

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Isibambeli

I-grog (ubumba obubhakiwe obugxotshiwe)

Free

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Isibambeli

Into yokuxuba ebumbeni

Free

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Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Making a Clay Crucible for Smelting — The Vessel That Holds Molten Metal

Making a Clay Crucible for Smelting — The Vessel That Holds Molten Metal

ngu-ForgeNO

Umsebenzi Wensimbi

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