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A method for preparing light-burned magnesia by using magnesite powder tailings

A technology of lightly burning magnesia and magnesite powder, which is applied in the field of refractory material production, and can solve the problems of inability to realize economical and efficient treatment of magnesite powder tailings, inability to obtain lightly burned powder by stable roasting, and low comprehensive utilization rate of resources and other issues to achieve the effect of improving resource utilization, reducing environmental impact, and reducing energy consumption

Active Publication Date: 2019-01-22
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past thirty years, a lot of research and practice have been carried out on the roasting of magnesite powder tailings, such as boiling roasting, suspension roasting, and rotary kiln roasting, but the cost of roasting remains high, about 500 yuan / t-light Burning powder (calcination of magnesite lump ore is about 250 yuan / t-light burning powder), can not realize the economical and efficient treatment of magnesite powder tailings, so far the magnesite powder tailings are still mainly stockpiled , the comprehensive utilization rate of resources is low, and the impact on the surrounding environment is serious
In the past production practice, try to adopt the tailings pressure ball-into the furnace roasting method, but the pulverization is serious during the heating process, the kiln is blocked, and it is impossible to obtain qualified light-burned powder by stable roasting in the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a method for preparing light-burned magnesia by using magnesite powder tailings, first the magnesite with MgO≥44% is dried, and then 7% binder (light-burned magnesia 5%, polyacrylic acid 1% , sodium polyacrylate 1%) was added to the dried mineral powder, stirred evenly for 30 minutes, and aged for 12 hours. After aging, mix 12% of water, and use 200MPa pressure to press into balls in a ball pressing machine, and continue aging for 72 hours. Lightly burn the pellets in a shaft furnace at 1000°C for 5 hours, with a heating rate of 20°C / min and a cooling rate of 5°C / min. Qualified light burnt magnesium pellets can be obtained.

Embodiment 2

[0024] In a method for preparing light-burned magnesia by using magnesite powder tailings, first the magnesite with MgO≥44% is dried, and then 10% binder (3% polyacrylic acid, 1% sodium polyacrylate, Ammonium polyacrylate 3%, polyacrylic acid amide 3%) were added to the dried mineral powder, stirred evenly for 60 minutes, and aged for 18 hours. After aging, mix with 10% water, and use 400MPa pressure in the ball pressing machine to press into pellets, and continue to age for 80 hours. Lightly burn the pellets in a shaft furnace at 800°C for 10 hours, with a heating rate of 10°C / min and a cooling rate of 4°C / min. Qualified light burnt magnesium pellets can be obtained.

Embodiment 3

[0026] In a kind of method utilizing magnesite powdery tailings to prepare light-burned magnesia, at first the magnesite of MgO≥44% is dried, then 9% binding agent (light-burned magnesia 4%, ammonium polyacrylate 2 %, polyacrylamide 3%) was added to the dried mineral powder, stirred evenly for 50 minutes, and aged for 24 hours. After aging, mix 15% of water, and use 300MPa pressure in a briquetting machine to press into pellets, and continue to age for 96 hours. Lightly burn the pellets in a shaft furnace at 1200°C for 4 hours, with a heating rate of 30°C / min and a cooling rate of 4°C / min. Qualified light burnt magnesium pellets can be obtained.

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Abstract

A method of producing qualified light-calcined magnesia with powdery tailings of magnesite. In the method, the powdery tailings of magnesite, of which the content of MgO is not less than 44%, is employed as a raw material. The method includes the processes of modifying and aging the powdery tailings of magnesite, pelletizing the powdery tailings of magnesite, and performing light calcination. The method successfully maintains the strength of pellets during calcination, and effectively solves a problem of pulverization during the light calcinations of the magnesite and can produce the qualified light-calcined magnesia pellet product that satisfies the HGT 2573-2012 industrial light magnesia related grade standard. The method tightly combines a magnesite lump ore roasting process in the prior art and achieves utilization of the powdery tailings of magnesite by means of the roasting equipment that is applied for roasting the lump ore in industry at present without much transformation. The method simplifies the recycling utilization process of the powdery tailings of magnesite, greatly reduces production energy consumption and improves economic benefit.

Description

technical field [0001] The invention belongs to the technical field of refractory material production, and relates to a method for preparing light-burned magnesia by using magnesite powder tailings. Background technique [0002] Magnesite is a magnesium carbonate mineral and is the main source of magnesium. It is one of the advantageous minerals of non-metallic minerals in my country. Various magnesium salt products prepared from magnesite are widely used in metallurgy, chemical industry, building materials and other industries. my country is rich in magnesite resources, and the ore reserves rank first in the world. However, with the continuous consumption of high-grade magnesite, the market demand for high-grade magnesium salt products is increasing. How to improve the comprehensive utilization rate of magnesite is becoming more and more important. The more you get everyone's attention. [0003] At present, the area from Haicheng to Yingkou Dashiqiao in Liaoning Province i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10
CPCY02P40/40
Inventor 林江顺王蒙岩赵磊王政冯爱玲王禹
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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