The price of bauxite

Bauxite, an important non-metallic mineral resource, is widely used in metallurgy, chemical industry, building materials and other industries. In recent years, with the rapid development of my country's economy, the demand for bauxite has increased year by year, and its price has also attracted market attention.

The price of bauxite is affected by many factors, such as origin, quality, market demand, etc. Generally speaking, the main producing areas of bauxite in my country are Henan, Shanxi, Guizhou and other provinces, among which the bauxite in Henan has better quality and relatively higher price. In addition, the grade, chemical composition, physical properties, etc. of bauxite will also affect its price.

Bauxite, an important non-metallic mineral resource, is widely used in metallurgy, chemical industry, building materials and other industries. In recent years, with the rapid development of my country's economy, the demand for bauxite has increased year by year, and its price has also attracted market attention.

The price of bauxite is affected by many factors, such as origin, quality, market demand, etc. Generally speaking, the main producing areas of bauxite in my country are Henan, Shanxi, Guizhou and other provinces, among which the bauxite in Henan has better quality and relatively higher price. In addition, the grade, chemical composition, physical properties, etc. of bauxite will also affect its price.

Bauxite production process

The production process of bauxite mainly includes the following steps:

Mining: Bauxite deposits are generally located on the surface or in shallow layers, and are mined by open-pit or underground mining.

Selection: The mined bauxite ore is crushed, screened, and graded to remove impurities and improve the grade.

Roasting: The selected bauxite is roasted at high temperature to volatilize the moisture and volatile substances in it and improve the activity of the bauxite.

Crushing: The roasted bauxite is crushed to a certain fineness.

Packaging: The crushed bauxite is packaged for easy transportation and storage.

Types of bauxite

Bauxite can be divided into the following types according to its chemical composition and physical properties:

High bauxite: Bauxite containing more than 80% alumina.

Medium bauxite: Bauxite containing 50%-80% alumina.

Low bauxite: Bauxite containing less than 50% alumina.

Bauxite clinker: roasted bauxite.

Bauxite ore: Unconcentrated bauxite ore.

Factors that determine the price of bauxite

Raw material cost: The raw material cost of bauxite mainly includes the costs of mining, selection, roasting and other links.

Market demand: The market demand for bauxite will affect its price. When the demand is strong, the price will rise, and vice versa.

Transportation cost: The transportation cost of bauxite will also affect its price. The price is relatively high in areas far away from the production area.

Policy factors: National policies have a certain impact on the mining, production, and sales of bauxite. Policy adjustments will affect price fluctuations.

The main factors affecting the price of bauxite are the calcination process and the quality after calcination. It is determined by the particle size. Next, let's take a detailed look at the calcination process of bauxite:

Calcination is the process of heating bauxite at high temperature to volatilize the water and organic matter in it, and at the same time transform the alumina crystal form to improve its activity. The calcination methods mainly include the following:

Rotary kiln calcination:

bauxite is sent to a rotary kiln and calcined at high temperature. Rotary kiln calcination has the characteristics of large output, low energy consumption and environmental protection.

Rotary kiln calcination of bauxite is a process of high-temperature calcination using a rotary kiln. The rotary kiln is a horizontal rotating cylindrical kiln. The material is fully exchanged with heat in the kiln by rolling and frying, so as to achieve the purpose of calcining the material. During the calcination process, the water and volatile substances in the bauxite are removed, and chemical reactions occur at the same time, which changes the physical and chemical properties of the bauxite and improves its use value.

Raw material preparation: The bauxite raw materials undergo pre-treatment steps such as crushing and screening to meet the requirements of the calcination process.

Batching: According to the calcination requirements, the pretreated bauxite is batched with other auxiliary materials (such as limestone, dolomite, etc.) to achieve the appropriate chemical composition and calcination effect.

Ball making: The prepared materials are balled to improve the air permeability and heat exchange efficiency of the materials.

Calcination: The prepared pellets are sent to the rotary kiln for calcination. The temperature in the rotary kiln is controlled between 1000-1200℃. The materials are rolled and stir-fried in the kiln to fully exchange heat and complete the calcination process.

Cooling: The calcined materials are cooled in a cooling tower to reduce the temperature for subsequent processing.

Finished product processing: The cooled clinker is crushed, screened, and processed to obtain bauxite clinker of different particle sizes.

The main equipment for calcining bauxite in the rotary kiln method includes: crusher, screener, batching system, pelletizing machine, rotary kiln, cooling tower, crusher, screener, etc.

(2) Vertical kiln calcination: Bauxite is sent to the vertical kiln and calcined at high temperature. Vertical kiln calcination has the characteristics of simple equipment, low investment, and easy operation.

The process of calcining bauxite in a vertical kiln:

The vertical kiln method is to feed the bauxite raw materials into a vertical kiln for calcination. By controlling the kiln temperature and calcination time, the bauxite undergoes physical and chemical changes. This method is suitable for large-scale production and has the advantages of high production efficiency and stable product quality.

Process flow

Raw material processing: crush and screen the bauxite ore to remove impurities and obtain qualified bauxite raw materials.

Batching: According to the chemical composition and calcination requirements of the bauxite, the raw materials are batched to ensure the quality of the calcined products.

Calcination: The batched bauxite is fed into a vertical kiln for calcination at a calcination temperature of 1000-1200℃ and a calcination time of 2-4 hours.

Cooling: After calcination, the bauxite is cooled to room temperature for subsequent processing.

Common particle sizes of calcined bauxite aggregates and powders

The particle size of calcined bauxite aggregates has an important influence on their application performance. According to the particle size, calcined bauxite aggregates can be divided into the following common particle sizes:

Coarse particles: generally refers to particles with a diameter greater than 5mm, mainly used for the preparation of aggregates for refractory materials, ceramics and other products.

 Medium particles: particles with a diameter between 1-5mm, suitable for the preparation of fillers for refractory materials, ceramics and other products.

Fine particles: particles with a diameter between 0.1-1mm, used to prepare raw materials for ceramics and chemical products.

Micropowder: particles with a diameter less than 0.1mm, with 200 mesh; 325 mesh can be used to prepare high-performance ceramics, refractory materials, etc.

Characteristics of high-quality calcined bauxite:

High purity: high-quality calcined bauxite should have a high purity, and its main component Al2O3 content should exceed 48%, and the Fe2O3 content should be low to ensure the high-temperature performance and stability of the material.

Good high-temperature resistance: high-quality calcined bauxite has good stability at high temperatures, can withstand physical and chemical effects in high-temperature environments, and ensure the integrity of the material.

High slag resistance: under high temperature conditions, calcined bauxite can resist the erosion of slag and maintain the stability of its structure, thereby improving the service life of the material.

High load softening temperature and low high-temperature creep: high-quality calcined bauxite has a low creep rate at high temperatures, can withstand large loads, and ensure the long-term stability of the material.

High bulk density: high-quality calcined bauxite has a high bulk density, which makes the refractory material made of it have higher strength and anti-scouring performance.

Gongyi Yuying Refractory Co., Ltd. is located in Gongyi City, Henan Province. It is located in the core area of ​​my country's refractory industry and has rich bauxite resources. The company has established close cooperative relations with local mining companies to ensure the high-quality and stable supply of raw materials. At the same time, the company also has its own mining rights, which guarantees product quality from the source.

Gongyi Yuying Refractory Co., Ltd. has an experienced and skilled R&D team dedicated to the innovation and optimization of calcined bauxite production technology. The company adopts advanced calcination technology to effectively improve the quality stability of products. In addition, the company also maintains close technical exchanges and cooperation with many scientific research institutes, constantly introduces new technologies and new concepts, and promotes the technological progress of enterprises.

Product quality is the lifeline of the enterprise. Gongyi Yuying Refractory Co., Ltd. always adheres to the business philosophy of survival and development by quality, strictly implements relevant national standards, and ensures product quality. The company has a complete quality inspection system, from raw materials entering the factory to products leaving the factory, every link is strictly controlled. With excellent product quality, the company's products have won a good reputation in the market.

Gongyi Yuying Refractory Co., Ltd. always puts customer needs first and provides customers with a full range of pre-sales, sales and after-sales services. The company has a professional customer service team to respond to customer needs in a timely manner and provide customers with customized solutions. At the same time, the company also provides comprehensive after-sales service to ensure that customers have no worries during use.

After years of development, Gongyi Yuying Refractory Co., Ltd. has formed a high brand awareness. Gongyi Yuying Refractory Co., Ltd.'s products are sold all over the country and are widely used in steel, nonferrous metals, chemicals, ceramics and other fields. With high-quality products and good reputation, the company has won the trust of many customers, and its market share has increased year by year.