A kind of preparation method of superfine purified ore concentrate powder sintered magnesia

A technology of sintering magnesia and fine ore powder, which is applied in the field of refractory material manufacturing, can solve the problems of energy waste, high temperature at the top of the calcination kiln, and reduced service life, so as to save equipment and space, reduce the sintering process, and prolong the service life Effect

Active Publication Date: 2021-11-05
于景坤
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Not only caused a great waste of energy, but also made the top temperature of the calcining kiln too high, resulting in a significant reduction in the service life of the equipment

Method used

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  • A kind of preparation method of superfine purified ore concentrate powder sintered magnesia
  • A kind of preparation method of superfine purified ore concentrate powder sintered magnesia
  • A kind of preparation method of superfine purified ore concentrate powder sintered magnesia

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Experimental program
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Effect test

Embodiment 1

[0038] refer to image 3 In this embodiment, low-grade magnesite produced in Dashiqiao in China is used as raw material, the main mineral is magnesite, and it also contains other minerals such as dolomite and a small amount of talc. Its main chemical composition is shown in Table 1.

[0039] Table 1 Main chemical composition composition

[0040] components MgO SiO 2

CaO Fe 2 o 3

Al 2 o 3

other ％ 46.56 1.89 0.67 0.31 0.05 50.52

[0041] Firstly, the primary grinding concentrate powder is purified and beneficiated, and the magnesite raw material is ground to 200 mesh with a common mill, that is, magnesite powder with a particle size of 74 μm; among them, the content of -200 mesh magnesite powder is 82%. . Put the finely ground magnesite powder into the flotation tank for wet flotation purification and dressing to obtain magnesite concentrate powder, the main chemical composition of which is shown in Table 2.

[0042] Table ...

Embodiment 2

[0047] refer to image 3 , the present embodiment also takes the low-grade magnesite of embodiment 1 as raw material, and the preparation steps are as follows:

[0048] 1) Use a mill to grind magnesite to 200 mesh magnesite powder, and perform primary grinding concentrate powder purification ore dressing treatment, wherein, the content of -200 mesh magnesite powder is 85%; the finely ground magnesite The powder is subjected to wet flotation purification in the flotation tank to obtain magnesite concentrate powder with 47.21% MgO;

[0049] 2) Perform secondary ultrafine crushing and grinding on the first-grade magnesite concentrate powder, and use a high-speed mechanical impact mill to perform ultra-fine crushing and grinding on the first-grade magnesite concentrate powder to obtain ultra-fine magnesite with a fineness of 1 μm to 2 μm Magnesium concentrate powder;

[0050] 3) Using a press to press the secondary ultrafine magnesite concentrate powder into shape under 400MPa; ...

Embodiment 3

[0053] Embodiment 3 Using the low-grade magnesite in Example 1 as raw material, the magnesite is subjected to primary grinding to 200 mesh magnesite powder, and the content of -200 mesh magnesite powder is 88%; the finely ground magnesite The powder is subjected to wet flotation purification in the flotation tank to obtain magnesite concentrate powder with a MgO content of 48.03%;

[0054] The first-grade magnesite concentrate powder is subjected to secondary ultra-fine crushing and grinding by jet mill to obtain ultra-fine magnesite concentrate powder with a fineness of 1 μm to 2 μm; the ultra-fine magnesite concentrate powder pressed at 380 MPa is After calcining at 1850°C for 3 hours in a shaft kiln, the decomposition process of magnesite is directly completed during the high-temperature calcination process, and the bulk density of 3.50g / cm is obtained through densification and sintering in the high-temperature zone. 3 high-density sintered magnesia.

[0055] In the above ...

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Abstract

The invention discloses a preparation method of sintered magnesia with ultra-fine purified ore concentrate powder. The invention adopts magnesite as a raw material, and obtains ultra-fine magnesite concentrate powder through two-stage crushing and grinding, and directly obtains it through compression molding and high-temperature calcination. Bulk density ≥ 3.40g / cm 3 High-density sintered magnesia. The invention cancels the light burning equipment and process required in the previous preparation process, makes the preparation process of high-density sintered magnesia simple and feasible, shortens the production cycle, and greatly reduces equipment investment and production costs. Compared with the existing high-density sintered magnesia technology, the present invention shortens the production cycle by 1 / 2, reduces the equipment investment by 50%, and reduces the production cost by more than 40%. It has good technical and economic value and wide market application prospect.

Description

technical field [0001] The invention relates to the technical field of refractory material manufacturing, in particular to a method for preparing high-density sintered magnesia through two-stage ultrafine purified concentrate powder. Background technique [0002] Sintered magnesia is the main raw material of basic refractories, and its bulk density has an important impact on the slag intrusion resistance and high temperature strength of refractories, directly affecting the service life of refractories. Research results and production practices show that when the bulk density of sintered magnesia is ≧3.40g / cm 3 , the service performance of the prepared refractory material is significantly improved, and the service life is twice that of general density sintered magnesia, and can replace fused magnesia as a refractory raw material. This can not only save energy and reduce environmental pollution, but also greatly reduce the production cost of refractory raw materials. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B2/10C04B35/04C04B35/66C04B35/626
CPCC04B2/102C04B35/04C04B35/6261C04B35/6267C04B35/66
Inventor 于景坤
Owner 于景坤
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