Magnesia-calcium clinker adopting core-shell coated structure and preparation method of magnesia-calcium clinker

Abstract

The invention relates to magnesia-calcium clinker adopting the core-shell coated structure and a preparation method of the magnesia-calcium clinker. According to the technical scheme, dolomite ore is crushed to 5-8 mm, subjected to heat treatment at the temperature of 900-1,000 DEG C for 0.5-1 h and ball-milled to have the particle size smaller than 80 mu m, and light-burned fine dolomite powder is obtained; then the light-burned fine dolomite powder and water are blended in the mass ratio being 100:(35-40) and mixed in a disk granulating machine for 0.2-0.3 h for granulating formation; formed particles are immersed in Cu(OH)2 gel for 1-2 min, and dolomite particles adopting the coated structure are obtained; then the dolomite particles adopting the coated structure are dried at the temperature of 30-35 DEG C for 12-15 h, dried at the temperature of 110-120 DEG C for 6-12 h, heated to the temperature of 1,200-1,400 DEG C in a resistance furnace, kept at the temperature for 2-3 h and cooled with the furnace, and the magnesia-calcium clinker adopting the core-shell coated structure is obtained. The magnesia-calcium clinker adopting the core-shell coated structure and the preparation method of the magnesia-calcium clinker have the characteristics that the production cost is low, the preparation technology is simple and the energy consumption is low, the prepared magnesia-calcium clinker adopting the core-shell coated structure has the complete core-shell coated structure and the excellent hydration resistance.

Description

technical field [0001] The invention belongs to the technical field of magnesia-calcium sand. In particular, it relates to a core-shell-coated structure magnesia-calcium sand and a preparation method thereof. Background technique [0002] Magnesia-calcium sand generally refers to a high-temperature sintered mixture with MgO and CaO as the main chemical components, and is mainly used to prepare alkaline refractory products such as magnesia-calcium bricks, magnesia-dolomite bricks, and magnesia-calcium-carbon bricks. However, magnesia-calcium sand and magnesia-calcium refractory products are easy to absorb moisture in the external environment to undergo hydration reaction, causing obvious volume expansion and pulverization damage. It can be said that improving the sintering and hydration resistance of magnesia-calcium sand is directly related to the industrial production, storage, transportation and use of magnesia-calcium refractories. [0003] At present, the preparation o...

AI Technical Summary

Problems solved by technology

However, the "additive addition method" is used to prepare magnesia-calcium sand, not only the firing temperature is high and the energy consumption is high, but the introduction of additives (such as rare earth oxides) further increases the production cost of magnesia-calcium sand

In addition, the "additive addition method" did not effectively solve the hydration problem of magnesia-calcium sand. Once the magnesia-calcium sand is hydrated from the surface to the inside, the hydration reaction will continue and the material will be damaged.