Dvc for a smelting furnace lining

A powder mix intended for the manufacture of a protective lining for a metal foundry furnace, the mix comprising, for a total of 100% and as percentages by mass based on the mass of the mix, of:

• less than 1% by mass of water, and
• a set of particles, the maximum particle size of said set of particles being less than 10 mm, more than 70% of said particles being of a refractory material, as a percentage by mass based on said set of particles,
• said particles being distributed between
• an aggregate fraction including said particles having a size of greater than or equal to 200 micrometers, referred to as “grains”, and
• a matrix fraction including said particles having a size of less than 200 micrometers, referred to as “fine particles”, representing between 5% and 40% of the mass of said mix,
• the group of the matrix fraction and of said liquid comprising a heat-activated binder, the heat-activated binder comprising a phosphate chosen from phosphates free of sodium, potassium, and lithium, referred to as “non-alkali metal phosphate”, said non-alkali metal phosphate representing more than 0.5%, as percentages by mass based on the mass of the DVC,
• the chemical composition of the group of the matrix fraction and the liquid is such that:
• 0.5
• %
• <
• P
• 2
• ⁢
• O
• 5
• <
• 5
• ⁢
• %
• ⁢
• and
• Na
• 2
• ⁢
• O
• +
• K
• 2
• ⁢
• O
• +
• Li
• 2
• ⁢
• O
• <
• 1.
• %
• ,
• as percentages by mass based on the mass of said mix, and
• the P2O5/(Al2O3+ZrO2+CaO+MgO+SrO+BaO) mass ratio in the matrix fraction is greater than 5% and less than 10%.