System of manufacturing firming agent for civil enqineering of soft ground using blast furnace slag and fly ash

摘要

[Technical Field/Solution] The present invention relates to a system for producing a solidifying agent for soft ground civil engineering using fly ash or other dust and blast furnace slag fine powder. Since the existing solidifying agent is a large amount of cement as a main raw material, hardening is slow and heat of hydration occurs during solidification. This is to solve the problem of contaminating soil and ground water by cracking due to change and elution of heavy metals such as hexavalent chromium. [Solution] The solidifying agent manufacturing system for soft ground civil engineering according to the present invention includes other dust (waste classification number: 51-05-99) and blast furnace slag fine powder that are generated during the steelmaking or steelmaking process or when incineration of sludge waste. In the system for manufacturing a solidifying agent for soft ground civil engineering to harden and solidify the soft ground without using cement, the blast furnace slag is quenched and pulverized into fine powder, 5 to 30% by weight based on 100% by weight of the solidifying agent. 2.7 to 3.2% of magnesium oxide (MgO), 1.0 to 1.4% of sulfur trioxide (SO ₃ ), silicon dioxide (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ), basicity of 1.58 to 1.64% , A first raw material tank 110 for storing blast furnace slag fine powder having a density of 2.90 to 2.94 g/cm 2, a specific surface area of 4,000 cm 2 /gr or more, and a flow value ratio of 97 to 105%; Contains quick lime (CaCO ₂ ) to form CSH through hydration reaction with the blast furnace slag fine powder and pozzolanic reaction, has 70 to 95% by weight with respect to 100% by weight of the total solidifying agent, has a hydration reaction with the blast furnace slag fine powder, and A second raw material tank 112 for storing other dust that reacts with pozzolanic acid; First and second raw material measurement sensors 153 and 154 for measuring the amount of blast furnace slag fine powder and other dust discharged from the first and second raw material tanks 110 and 112; First raw material supply control device 120 for controlling the amount of fine blast furnace slag discharged from the first raw material tank 110 through a screw rotation speed using an inverter according to the measured value of the first raw material measurement sensor 153 ; A second raw material supply control device 121 for controlling the amount of other dust discharged from the second raw material tank 112 through a rotary valve using an inverter according to the measured value of the second raw material measurement sensor 154; Raw material transfer device 130 for transporting blast furnace slag fine powder and other dust discharged through the first and second raw material supply control devices 120 and 121 to the inlet of the raw material mixer 140 by rotating the screw 133 inside the barrel ); The raw material mixer (which receives the blast furnace slag fine powder and other dust from the raw material transfer device 130 and mixes them by two screws 143 rotating inside the barrel and discharges them into the loading box 170 through the discharge hopper 144 ( 140); It is installed on the lower portion of the discharge hopper 144, the opening and closing handle 146 to open or close the discharge port by the operator to discharge or block the solidifying agent; A process display electronic board 156 for displaying the discharge amount of each raw material discharged through the first and second raw material supply control devices 120 and 121 in real time and displaying the operation state of the entire process by LED for each device; When the raw materials of the first and second raw material tanks 110 and 112 are insufficient, or when the first and second raw material supply control devices 120 and 121, the raw material transfer device 130, and the raw material mixer 140 fail and malfunction, A warning light and alarm device 155 in operation; Controlling the operation of the first and second raw material supply control devices 120 and 121, the raw material transfer device 130, and the raw material mixer 140, by a process program input in advance for each type of soft ground and water content or by a consumer A solidifying agent control unit 150 for controlling the mixing ratio and the discharge amount of the other dust and the fine blast furnace slag according to the data input by the request of the; And monitoring and managing the entire manufacturing process by interlocking with the solidifying agent control unit 150 through a communication network, and by the process program input in advance for each type and water content of the soft ground or by data input by the consumer's request. 1, the second raw material supply control device (120,121), the raw material transfer device 130, a system management server to control the mixing ratio and discharge amount of the other dust and the blast furnace slag by controlling the operation of the raw material mixer 140 ;, the other dust and the blast furnace slag fine powder is composed of a mixing ratio of one of 70:30, 75:25, 80:20, 85:15, 90:10, 95:05, the other The dust has 70 to 95% by weight based on 100% by weight of the total solidifying agent, and the blast furnace slag fine powder has a 5 to 30% by weight based on 100% by weight of the total solidifying agent. do. [Benefit] According to the present invention, by using other dust and blast furnace slag fine powder as the main raw material, it is possible to increase the solidification and compressive strength of the soft ground and rapidly improve the curing speed, and to solve the contamination problem by heavy metals.