Practice Of Solving Grate Paste

Analysis on the reason of grate paste blocking

1.1 Unreasonable grain size and thickness of bedding material

When the thickness of the bottom material is too thin, the distance between the sintering material cake and the grate is not enough, and the small size mixture is easy to pass through the bottom material layer and blocked between the furnace gap.If the particle size of the base material is too fine, the base material with small particles is easily stuck between the cracks of the grate, forming the initial plugging material between the grate bars.At the same time, the small particle substrate also affects the permeability of the substrate itself, which limits the improvement of the substrate thickness.Due to the design of the screening system of 1# sintering machine, the grain size of the substrate is 5 ~ 12mm, and the thickness of the substrate is 30 ~ 50mm, which has the problems of too small grain size and thin thickness.

1.2 Influence of poor granulation effect of mixture

Some fine powder materials due to their own properties in the sintering mixing machine granulation adhesion effect is very poor, at the same time 1# sintering machine 1, 2 mixing drum there are internal lining plate adhesion and water is unreasonable problems, so that the proportion of sintering mixture ≤1mm increased.After the small size mixture is distributed to the sintering machine trolley, with the progress of sintering process, a large amount of dust is formed in the dry zone and the ultra-wet zone, which passes through the grate clearance with the air flow, further aggravating the blockage degree of the furnace clearance.

1.3 Influence of raw material conditions

1 # sintering machine with all kinds of recycling the harmful elements contained in the impurity and dust are K, Na, zinc, etc., especially in sintering material can form KCl and Cl, K in convulsions process under the action of adhesion in the gas and small grain of the surface of the sinter, K and Cl in the help of H2O electrochemical corrosion gas, fine powder and dust produced further fill the gaps, and with the increase of content of KCl and the effect of high temperature roasting, adhesive content gradually hardening, resulting in grate between vent paste completely blocked.See Table 1 for the composition of dust dust on the head of # 1 sintering machine.

1.4 Influence of other production parameters

In addition to the above factors, the control of sintering end point and temperature also have a great influence on the stacking and plugging of furnace bars.If the sintering end point is seriously lagged behind or the end point temperature is too low due to uneven cloth or moisture fluctuation of the sintering machine, it will lead to the sintering cake "sandwiced-life", and the unburned sintered material will adhere to the surface and gap of the grate.At this time, the temperature of the grate is lower, which is conducive to the "condensation" of alkali metal materials in the gap between the grate and aggravates the plugging degree of the grate.