Calcium aluminate rotary kiln
Rotary kiln for calcium aluminate
Fuel: coal, heavy oil, or natural gas
Application: metallurgy, chemical industry, building materials, cement, refractory and other fields.
As the name suggests, the main purpose of the calcium aluminate rotary kiln is to process calcium aluminate. Our calcium aluminate rotary kiln adopts an advanced hydraulic thrust roller device, metering plunger pump technology, an auxiliary drive device to prevent kiln body bending and deformation, and an advanced sealing device. During operation, it has a large processing capacity and achieves good calcination results.
Calcium aluminate is an inorganic compound formed by sintering calcium oxide and aluminum oxide at high temperatures. After crushing bauxite and limestone into spheres, they are proportionally fed into the rotary kiln. Through the calcination process, calcium aluminate is formed. Calcium aluminate products can be classified into three major categories: water treatment, steel refining slagging agent, and high-alumina cement. Calcium aluminate has been widely applied in the fields of chemical engineering, environmental protection, and wastewater treatment.
Raw material of calcium aluminate rotary kiln
With the continuous development of the economy, the demand for calcium aluminate powder production and the use of various raw materials are increasing. The existing production process of calcium aluminate powder in the calcium aluminate rotary kiln mainly involves crushing and drying high-alumina bauxite, grinding it into powder, and then sintering it at high temperatures in the rotary kiln. The main raw material for producing calcium aluminate powder is high-alumina bauxite, which accounts for over 50% of the product. It is required that the content of alumina trioxide in high-alumina bauxite must be above 70%, and the content of silica dioxide should be less than 8%. Due to the influence of reserves and extraction costs, the current market price of bauxite is above 600 yuan/ton. Each ton of calcium aluminate powder requires over 650 kg, and the cost is above 390 yuan/ton. Therefore, the production cost of calcium aluminate powder continues to increase, and there is an urgent need for a low-cost raw material to replace high-alumina bauxite. Currently, waste aluminum slag contains a high aluminum content, and its market price is below 100 yuan/ton, making it the best choice for preparing calcium aluminate powder.
With the improved understanding of the role of lime in industrial production, the proportion of calcium aluminate powder in industries is increasing year by year. The calcination principle of the calcium aluminate rotary kiln determines its unparalleled high quality, making it the preferred kiln type for high-end calcium aluminate powder users.
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why choose AGICO?
AGICO Rotary Kiln has been dedicated to the research of calcium aluminate powder rotary kiln calcination technology for many years. We have conducted studies on various common symptoms of the rotary kiln and effectively resolved issues such as ring formation, low production yield, and high energy consumption. Compared to kilns of the same specifications in traditional processes, our technology increases production yield and reduces thermal consumption. The flue gas temperature is maintained below 250°C, making it easier for dust collection and meeting modern requirements for energy conservation and environmental protection.
The technological innovation of calcium aluminate rotary kiln
- The 800t/d calcium aluminate powder rotary kiln technology has become more mature and has become the mainstream kiln type. The main advantages of an 800t/d production line are high production yield and low operating costs. In the mainstream 800t/d calcium aluminate powder rotary kiln, when the clinkerization rate is ≤3%, the production yield is ≥1000t/d, and the coal consumption is ≤1000 kcal/t ash. The unit investment cost is low, and the cost-effectiveness is high. The large-scale development of calcium aluminate powder rotary kilns is restricted by processing capacity and transportation conditions. At this stage, the 800t/d rotary kiln has relatively higher cost-effectiveness.
- Optimization of refractory material configuration: With the impact of environmental requirements, the price of refractory materials has been rapidly increasing. While ensuring the service life of various parts of the rotary kiln, it is important to select suitable materials for the calcination zone rather than the most expensive ones. With proper operation, the service life can be extended, and the kiln shell temperature can be reduced. In lower temperature areas such as the preheater, standard bricks can be used to reduce costs.
1. Raw Material Test
2. Program Design
3. Device Manufacturing
6. Technical Training
7. delivery on time
8. after-sales service
WORKING PROCESS OF CALCIUM ALUMINATE ROTARY KILN
- The process involves adding waste aluminum slag to hydrochloric acid and stirring to obtain a solution of polyaluminum chloride and polymerized waste aluminum slag. The weight ratio of waste aluminum slag to hydrochloric acid is 1:4.5-5.5, with hydrochloric acid having a mass percentage of 20%. The reaction temperature is 65-90°C, stirring speed is 45-55 revolutions per minute, and stirring time is 2.5-3.5 hours. The resulting polyaluminum chloride solution contains 7.5-8% mass percentage of alumina trioxide, while the polymerized waste aluminum slag contains 65-75% mass percentage of alumina trioxide.
- The obtained polymerized waste aluminum slag is uniformly mixed with ground limestone. The mixture is then added to the rotary kiln and sintered to produce clinker, which is subsequently ground into calcium aluminate powder. The weight ratio of polymerized waste aluminum slag to limestone is 50-65:35-50. The sintering temperature is 1200-1300°C, and the sintering time is 3-4 hours. The resulting calcium aluminate powder contains 45-53% mass percentage of alumina trioxide, 26-40% mass percentage of calcium oxide, and has an acid leaching rate of over 95%.
specification of calcium aluminate rotary kiln
|Size（m）||Kiln dimensions||Motorpower（kw）||Total weight（t）|