Carbide slag is a highly corrosive alkaline solid waste that seriously pollutes the environment. In recent years, environmental protection has received unprecedented attention from society, so how to consume carbide slag is also a problem for the entire society. What factory can consume a large amount of carbide slag? How about using vertical mill to process carbide slag?
At present, the recycling of calcium carbide slag mainly includes the following aspects: as building materials and roadbed raw materials, waste gas and wastewater treatment, and production of general chemical products. These uses have achieved the effect of resource utilization of carbide slag to a certain extent, and alleviated the pollution of carbide slag to the environment. However, although calcium carbide slag is an effective way to deal with carbide slag as a building material and roadbed material, which can save costs and can also deal with waste residue, there are still some problems. For example, the wall material made of calcium carbide slag has a larger bulk density than traditional fired clay bricks, and the transportation cost is high. The use of calcium carbide slag can replace the clinker used in limestone for firing cement, which can not only produce building materials but also effectively alleviate the environmental pollution caused by calcium carbide slag. Therefore, cement plants can consume a large amount of carbide slag through vertical mill grinding. So, what is the effect of using calcium carbide slag in the vertical mill? As a manufacturer of carbide slag vertical mill, Guilin Hongcheng will analyze and answer for you today.
What factory can consume a large amount of carbide slag? Carbide slag has uniform composition and high calcium content. It is a high-quality cement raw material. It is the method with the largest amount and the most thorough utilization to replace limestone to produce cement. The production of cement from calcium carbide slag usually adopts the process of "wet grinding and dry burning" or pre-drying "dry grinding and dry burning". In traditional cement production, for bulk wet materials, there was a consensus in the cement industry 20 years ago: when the cement moisture exceeds 10%, it is the moisture limit of the raw material mill that can dry raw materials. Now vertical mills are generally used. This data It can be increased to 12%-14%.
The vertical mill uses the grinding roller to squeeze the material on the grinding table, and relies on the airflow to take the particles that meet the fineness requirements out of the mill, and collects them by the dust collector to become a finished product; inside the vertical mill, the particles with larger particle size in the airflow Under the action of gravity, the particles fall back to the grinding disc for grinding. This process needs to be carried out many times to make the fineness meet the requirement; during the grinding process, the gas and solid are contacted to generate heat exchange, and the wet material is dried. Therefore, the vertical mill has strong adaptability to the moisture in the raw material, and within a certain range, the change of the moisture content of the raw material has little effect on the output of the system. The vertical mill uses calcium carbide slag process: limestone, sandstone, iron powder and other raw materials are batched by the belt scale at the bottom of the raw material warehouse, and then transported to the vertical mill workshop by a belt conveyor; the calcium carbide slurry is made into a filter cake by a box-type automatic filter press, and then It is transported to the grinding belt by the scraper conveyor; in order to prevent the damage of the iron parts to the vertical mill, a permanent magnet iron remover is installed in front of the discharge port of the belt conveyor; the batch material is fed into the vertical mill through three gates, and the three gates are locked Wind feeding device, hydraulic control, in order to prevent the wet material from sticking, an air pipe is drawn from the air inlet of the vertical mill to heat it; the exhaust gas at the kiln tail is used as the main heat source for drying raw materials, and all the waste gas is introduced into the vertical mill, and the hot blast stove produces High temperature gas is also introduced into the mill air duct. The gas out of the mill is advanced by a high-efficiency cyclone dust collector. After the powder in the gas is separated, it is used as a finished product. It is fed to the screw conveyor by the grid wheel, and is lifted into the warehouse by the elevator; The electrostatic precipitator performs secondary purification, and the collected dust is also used as a finished product, which is transported to the storage hoist by a screw conveyor.
What is the effect of using calcium carbide slag in the vertical mill?
(1) Compared with the ball mill, the residence time of the material in the vertical mill is very short. After feeding for a few minutes, the current of the storage elevator rises from 20A to 27A and remains stable. According to this feature, the fineness and chemical composition of the product can be quickly determined and adjusted.
(2) As a dry grinding equipment, the vertical mill has high heat exchange efficiency. It has been measured that the gas temperature can drop from 350°C to 90-100°C at 1m above the wind ring, the gas-solid heat exchange is rapid, and there will be no phenomenon that the hot gas cannot transfer heat to the heated body. Moisten the material in time.
(3) At present, in the process of using carbide slag to produce cement, the characteristics of carbide slag are often changed to adapt to the new dry method. Utilizing the characteristics of calcium carbide slag, it is studied that the use of vertical mill "dry grinding and wet burning" can simplify the process flow, reduce construction investment and production costs, and achieve better economic benefits. But it is worth noting that: due to the fine particles of calcium carbide slag and light volume and weight, this factor should be considered when selecting vertical mills, supporting fans, and conveying equipment.
As a professional vertical grinding mill manufacturer, Guilin Hongcheng has rich experience in equipment selection in carbide slag grinding projects. If you have a large demand for carbide slag consumption and need to purchase carbide slag vertical mills, please leave us a message.