Technology for producing and reducing ilmenite using rotary kiln

A process method and ilmenite technology are applied in the field of rotary kiln production of reduced ilmenite, which can solve the problems of difficult control of temperature and temperature uniformity, long production cycle, and low production efficiency, so as to shorten the reduction reaction time, The effect of stable product quality and simplified production process

Active Publication Date: 2006-05-17
广西粤桥新材料科技有限公司 +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of production equipment, the traditional process has the following disadvantages: first, it is difficult to control the temperature and temperature uniformity, and the quality of the finished product is not easy to stabilize; second, the production cycle is long and discontinuous, and the production efficiency is low; third, it must use clay pots as the reaction Containers, cumbersome process operations

Method used

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  • Technology for producing and reducing ilmenite using rotary kiln

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] a. Raw material preparation

[0009] Pass the ilmenite through a 60-mesh vibrating sieve. The reducing agent coal ash is crushed and screened to remove powdery materials. The weight ratio of reducing agent coal ash to ilmenite is 0.4:1, and the weight ratio of desulfurizing agent lime to reducing agent coal ash is 0.1:1.

[0010] b. Restore

[0011] When the temperature of the high-temperature zone in the kiln rises to 900°C, start to add the raw materials in a to the kiln, adjust the rotary kiln speed, raise the temperature and stabilize the temperature of the high-temperature zone in the kiln between 1120-1150°C, and control the reduction rate above 85%. , The reducing atmosphere pressure is kept between +1~+3mm water column.

[0012] c. cooling

[0013] When the material is about to reach the kiln head of the reduction rotary kiln, the cooling water for cooling the rotary kiln is turned on to cool the material to below 50°C.

[0014] d. Screening, magnetic separ...

Embodiment 2

[0019] The weight ratio of reducing agent coal ash to ilmenite is 0.3:1, and the weight ratio of desulfurizing agent lime to reducing agent coal ash is 0.08:1. When the temperature of the high temperature zone in the kiln rises to 900°C, start to add raw materials into the kiln, adjust the rotary kiln speed, raise the temperature and stabilize the temperature of the high temperature zone in the kiln at 1050-1120°C for reduction. Other process conditions are identical with embodiment one.

Embodiment 3

[0021] The weight ratio of reducing agent coal ash to ilmenite is 0.6:1, and the weight ratio of desulfurizing agent lime to reducing agent coal ash is 0.15:1. When the temperature of the high-temperature zone in the kiln rises to 900°C, start to add raw materials into the kiln, raise the temperature and stabilize the temperature of the high-temperature zone in the kiln at 1130-1150°C for reduction. Other process conditions are identical with embodiment one.

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Abstract

A process for producing reduced ilmenite in a rotary kiln. The ilmenite, reducing agent, and desulfurizing agent are prepared as raw materials, added to the rotary kiln, and heated to 1050-1180°C in a reducing atmosphere for reduction. The pressure of the reducing atmosphere is kept at Between 0-4mm water column, obtained by cooling, screening, magnetic separation, impact winnowing, and blending. The weight ratio of reducing agent and ilmenite in the raw material is 0.3-0.6:1, and the weight of desulfurizing agent and reducing agent The ratio is 0.02~0.2:1. The method realizes continuous flow operation, greatly improves production efficiency, shortens the reduction reaction time, and is easy to control the uniformity of temperature, thereby ensuring stable product quality and meeting the needs of producing welding electrodes.

Description

technical field [0001] The invention relates to a production method of reduced ilmenite, in particular to a process method for producing reduced ilmenite in a rotary kiln. Background technique [0002] Reduced ilmenite is one of the main auxiliary materials for the production of welding electrodes. The traditional production method is to use tunnel kiln or steamed bread kiln as the main equipment, and put ilmenite, reducing agent coal powder, and desulfurizing agent lime into the above equipment It can be obtained by heating reduction, crushing, sieving and magnetic separation. Due to the limitation of production equipment, the traditional process has the following disadvantages: first, it is difficult to control the temperature and temperature uniformity, and the quality of the finished product is not easy to stabilize; second, the production cycle is long and discontinuous, and the production efficiency is low; third, it must use clay pots as the reaction container, the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/12C22B5/06B22F9/20
Inventor 夏国春陈海生陈智刘永雄李时添
Owner 广西粤桥新材料科技有限公司
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