Calcination process of boron ore powder

A calcination process, a technology of boron ore powder, applied in boron/boride and other directions, can solve the problems of long calcination period, low energy utilization rate, low activation rate of iron ore, etc., to achieve stable product quality, optimized process, process flow simple effect

Inactive Publication Date: 2008-11-05
辽宁东大粉体工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no advanced process for calcination of iron ore materials. Generally, static kiln calcination will emit tail gas with high temperat

Method used

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  • Calcination process of boron ore powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Use the gas-fired hot blast stove as the heat source of the calcination furnace, add boron iron ore with a water content of 20% into the dryer, break it into boron ore powder and dry it for 1-10 seconds, and then the mixture of boron ore powder and air will undergo gas-solid separation of semi-finished products The exhaust gas is purified and discharged, and the dry solid is sent to the calciner. At the same time, hot air is added as the calcining heat source. The calcining time is 1-10s, and the temperature in the calciner is 1000-1150°C. The air pressure in the calciner is controlled by changing the wind speed of the induced draft fan. It is -100~-200Mpa. Afterwards, the gas-solid mixture enters the finished product gas-solid separator from the outlet of the calciner, and the hot gas in it is recycled into the dryer as a drying heat source, and the calcined solid is cooled by the air cooler to become a finished product, and is captured to the storage bin.

Embodiment 2

[0011] Use the coal-fired hot blast stove as the heat source of the calcination furnace, add boronite with a water content of 25% into the dryer, and after being broken into boron ore powder and dried for 10 to 15 seconds, the mixture of boronite and air passes through the semi-finished gas Solid separator, in which the exhaust gas is purified and discharged, the dry solid is sent to the calciner, and hot air is added as the calcining heat source at the same time, the calcining time is 10-15s, the temperature in the calciner is 1000-1200 °C, and the calciner is controlled by changing the wind speed of the induced draft fan The internal air pressure is -200~-300Mpa. Afterwards, the gas-solid mixture enters the finished product gas-solid separator from the outlet of the calciner, and the hot gas in it is recycled into the dryer as a drying heat source, and the calcined solid is cooled by the air cooler to become a finished product, and is captured to the storage bin.

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Abstract

The invention provides a technique for calcining powdery lagonite; the technique process comprises the following steps: lagonite is added into a drier, then the lagonite is broken into powder for drying, then the powdery lagonite and the air are fed into a semi-finished product gas-solid separator to make gas-solid separation, wherein, the gas is emitted out as waste gas and the dried solid is fed into an calcinator for calcination; at the same time, hot air is fed as a heat source, and the calcined lagonite and air are fed into a finished product gas-solid separator to make gas-solid separation, wherein, the hot gas are recovered to the drier as a heat source after the gas-solid separation, and the calcined solid is fed into a wind cooler for cooling, and finally the finished product can be obtained for storage. During the technical process, the water content of the lagonite fed into the drier is 15 to 30 percent and the grade is 6 to 10 percent; the calcination temperature is 1000 to 12000 DEG C and the calcination period is 1 to 15s. The technical flow is simple and short with high energy utilization ratio; meanwhile, the product quality is good and the activation rate of the powdery lagonite can be improved to 85 percent at least.

Description

Technical field [0001] The invention relates to a process of heat treatment, drying and calcination, in particular to a calcination process of boron ore powder. Background technique [0002] Boron ore is a scarce resource, and it is particularly important for the development and utilization of "black boron ore" (ie boronite) with large reserves, especially the industrialization of the separation and comprehensive utilization technology of boronite. The use of boron ore powder after iron separation is the main method to solve the shortage of resources, and the use of calcination is the main technological measure for extracting boron. At present, there is no advanced process for calcination of iron ore materials. Generally, static kiln calcination will emit tail gas with high temperature, low energy utilization rate, and long calcination cycle, usually 1 to 3 hours. After calcining, the activation rate of Pengiron ore is relatively low. Contents of the invention [0003] T...

Claims

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Application Information

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IPC IPC(8): C01B35/02
Inventor 张继宇
Owner 辽宁东大粉体工程技术有限公司
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