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How to make the high active lime rotary kiln perform better?

2019-12-20
Times

High-efficiency active lime rotary kiln is a new type of equipment mainly used for processing zircon sand. It has the characteristics of high calcination efficiency and strong material adaptability. The degree is getting higher and higher. In addition to paying more attention to the price of the equipment, users are also concerned about how to make the zircon sand rotary kiln perform better in later use. Therefore, this article introduces how to make the equipment function. Better performance? Active lime price


Zircon sand, also known as zircon sand, is a mineral composed mainly of zirconium. It has high thermal stability, high hardness, and corrosion resistance. It is often used in the foundry industry, ceramics, and glass industry.


1. Check the zircon sand rotary kiln. Before operating the equipment, you must first check whether there is a loop in the cylinder and whether the refractory bricks have fallen off. If there is any need to handle them in time, otherwise the normal use of the equipment will be affected.


2. Trial operation. Then it is to turn on the power of the zircon sand rotary kiln, and make the equipment run for a period of time to see if the cylinder can reach the specified speed. Only through trial operation can the equipment be checked for normality, otherwise the zircon sand rotary kiln may cause the kiln speed to be too low during the calcination process, which will cause bad results.


3. Feed evenly. When feeding materials into the zircon sand rotary kiln, it needs to be continuous and uniform, otherwise it will cause blockage of the equipment and poor quality of products from the kiln. 4. It should also be noted that minerals that cannot be calcined cannot be put into the zircon sand rotary kiln, which will cause damage to the equipment, because the heat resistance of the materials and barrels used by each calcination equipment is different.


The replacement of coke by vertical kiln coal of active lime manufacturers can effectively alleviate the shortage of coking coal resources and the contradiction between coke supply and demand, significantly improve the economics of lime production, and also play a certain energy saving and environmental protection effect. It is a high application value New topics with broad market prospects. The thesis aims to develop coking coal briquettes that meet the production requirements of alumina industrial machinery mixed lime shaft kiln. Firstly, the characteristics, forming method, bonding mechanism, application situation and development trend of briquette were comprehensively and systematically explained. The reason for coking coal briquette was explained and a feasibility analysis was carried out. Then, on the premise of determining the specific evaluation indexes of the lime shaft kiln for coke briquette, a low-grade anthracite coal is used as a raw material, and a small amount of bituminous coal is blended to screen out a magnesium-based curing agent, magnesium-based activator, biomass fiber, and reducing coal. The composite binder composed of water agent is determined by orthogonal test of L27 (313) and multi-index comprehensive weighted scoring method. The formula of the coking coal composite binder is determined by range analysis and analysis of variance, and the key moldings are matched with it. The process parameters are analyzed, and the bonding mechanism and waterproof performance of the adhesive are analyzed. The test results show that the optimal combination of the lime vertical kiln coke briquette composite binder is 4% magnesium-based curing agent, 0.6% magnesium-based activator, 1% biomass fiber, and 0.12% water reducing agent; Corresponding key molding process parameters are: molding pressure 20kN, molding moisture 17%, coal material particle size composition below 0.5mm, 58% grain size, 0.5-1mm grain size content 14%, 1- 2mm grain content 17%, 2 ~ 3mm particle size content is 11%; blending amount of bituminous coal is 10% of anthracite coal; biomass fiber has obvious enhancement effect on the drop strength of briquette; coking coal has better waterproof performance under low dry strength . The porosity of the coking briquette was tested experimentally, the thermal convection drying characteristics of the coking briquette and the relationship between the moisture content of the briquette and its cold strength were studied, and the heat and mass transfer mechanism of the thermal convection drying of the briquette was analyzed. The results show that the porosity ε of coking briquette coal is 16.23%; its thermal convection drying process has undergone three stages of rising speed drying period, constant speed drying period and falling speed drying period, of which the drying speed drying period is the main type; There is a phenomenon that the evaporation interface moves inward during the coal drying process; the cold mechanical strength of the coke briquettes first increases and then decreases with the decrease of its water content, and there is a maximum value. The coke briquette coal has a dry water content of 2.32%. ; The heat transfer and mass transfer of coke briquette drying process are coupled with each other. In the rising speed and constant speed drying stages, it is an external condition control process, and in the falling speed drying stage, it is an internal condition control process. Based on Whitaker's volume average theory, using Darcy's law, a mathematical model of coking coal thermal convection drying process was established from the perspectives of mass conservation and energy conservation, and the residual saturation Sir was used to divide the briquette drying process into The dry and wet regions are coupled. The dry and wet region models are coupled through a dynamic evaporation interface.


The main equipment in the limestone production line is the rotary kiln, which can be divided into cement kiln, metallurgical kiln, alumina kiln, drying kiln and lime kiln according to the processing materials. Rotary kiln has simple structure, convenient and reliable production process control, few wearing parts, and high operating rate. It is a device for calcining high-grade cement in cement plants. It is also widely used in metallurgy, chemical industry, construction and other industries. The price of the active lime kiln produced by our factory is strong, the operation is stable, and the products are out of the kiln.


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