Pouring solution using quick-drying castable

Main features:

The main runner pouring scheme of the blast furnace tapping field is applicable to the single taphole blast furnace with only one tapping runner. When the main runner is in the late stage of use, the erosion is serious and the area is oxidized. If the use continues, there is a risk of penetrating, but if the ditch is overhauled, In order to solve this problem, the iron and steel enterprise's output and economic benefits have been greatly reduced. In order to solve this problem, our company adopts the blast furnace cast iron main ditch quick-drying castable casting plan. This set of pouring scheme adopts segmented casting, and the upper and lower main trenches are divided into two constructions. The timing is started after the blast furnace is blocked, and all the processes are completed in 60 minutes, and the ironing conditions are available. This solution has the characteristics of short construction time, good construction performance, short baking time, fast drying, high strength, good slag resistance and erosion resistance, and minimizes the economic loss of customers.

Specific construction technology is as follows:

a. Pre-construction tools and personnel preparation work: 25 to 30 construction workers, and a set of molds for the main ditch is about 6 to 7 meters long. (According to the length of the main ditch), the thin iron sheets are reserved in advance. 2 sets of compressed air ducts, 1 water pipe, 1 excavator, 1 homemade excavator scraper, 1 mixer, 4 vibrating bars, 2 lifting machines, 6 steel shovel, 4 steel brazing, There are 50 woven bags of 30 kilograms, 7 tons of quick-drying castables, 600 kilograms of silica sol, and a small wood for roasting ditch.

b. Construction steps:

·           Clean the slag iron: burn the residual iron hole to two-thirds in advance, burn the iron slag after the iron mouth comes to the wind, put the slag iron as soon as possible, the excavator replaces the scraper, and the mud gun machine quickly retracts the shovel Clean the slag iron on both sides of the main ditch and the ditch. After the watering personnel water on both sides of the main ditch and the ditch, the construction personnel will stand on both sides of the main ditch and use the air duct to blow the slag iron in the ditch. This section of construction time is 15 minutes.

·           Place the mold and prepare for mixing: Use the driving method to hang the mold into the upper main ditch, measure the size of both sides, press the hammer head on the mold, and block the sides of the mold with steel plate or water cannon. At the same time as the mold is placed, the construction personnel prepares to stir the quick-drying castable, and the amount of the bonding agent silica sol is about 8%. The specific amount is determined according to the dry and wet conditions of the construction on site, and it is as thin as possible compared with the water pouring material. The construction time of this section is 10 minutes.

·           Stirring and pouring: the stirred castables are placed into the woven bag with a steel shovel. The two sides of the main groove are manually pushed from the iron mouth to push the material from the top to the bottom of the trapezoid. The vibration is started to vibrate. The construction time is 25 minutes.

·           De-molding and baking: After the pouring is completed, check whether the two main castables in the main ditch are hardened. After the hardening, the excavator hammer is lifted, the mold is loosened by the machine, and then the mold is hung on the driving hook. Lift the mold and put it into the wood to bake the iron. This construction takes 10 minutes and the various construction steps take 60 minutes. The specific construction time can be determined according to the negotiation with the customer. The longer the time, the better the construction.