High-purity magnesite brick for ultrahigh-temperature shaft kiln with temperature greater than or equal to 2100 DEG C and manufacturing method of high-purity magnesite brick

A manufacturing method and ultra-high temperature technology, applied in the field of high-purity magnesia bricks and its manufacturing, can solve problems such as limiting the temperature of refiring shaft kilns, and achieve the effects of improving product strength, load softening temperature and sintering performance

Active Publication Date: 2021-06-29
河北北方窑业工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only high-purity sintered magnesia bricks with the same quality as dead-fired magnesia can be used; general sintered magnesia bricks are difficult to reach products with a service temperature above 2000 °C due to the raw material material and manufacturing process, which limits the temperature of the heavy-fired shaft kiln. improve

Method used

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  • High-purity magnesite brick for ultrahigh-temperature shaft kiln with temperature greater than or equal to 2100 DEG C and manufacturing method of high-purity magnesite brick
  • High-purity magnesite brick for ultrahigh-temperature shaft kiln with temperature greater than or equal to 2100 DEG C and manufacturing method of high-purity magnesite brick

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specific Embodiment

[0035] Specific examples are the following table (parts by weight):

[0036]

[0037] The manufacture method of high-purity magnesia brick of the present invention adopts following steps:

[0038] Step 1, mixing materials:

[0039] Add magnesia A, magnesia B, magnesia C, pulp waste liquid, and magnesia D to the wet wheel mill in sequence, and mix in the wet wheel mill for 18-22 minutes to obtain a semi-dry molding material. 2.5-3%;

[0040] Step 2, Forming:

[0041] Put the semi-dry molding material into the cavity of the hydraulic brick press machine HPF-III2500 of Rice Company, set the pressure at 25000Kn, and make adobe; the density of the adobe is 2.8-3.1g / cm 3 ;

[0042] Step three, drying:

[0043] Put the finished bricks into the tunnel dryer, the temperature of the tunnel dryer is 150°C, the drying time is 24 hours, and the moisture of the bricks after drying is less than 1%;

[0044] Step four, firing:

[0045] Put the brick adobe in step 3 on the tunnel kil...

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Abstract

The invention relates to a high-purity magnesite brick for an ultrahigh-temperature shaft kiln with a temperature larger than or equal to 2100 DEG C and a manufacturing method of the high-purity magnesite brick. The high-purity magnesite brick is prepared from magnesite A, magnesite B, magnesite C, magnesite D and paper pulp waste liquid. The manufacturing method of the high-purity magnesite brick comprises the steps of mixing, forming, drying and sintering. The raw material magnesite of the high-purity magnesite brick is prepared by crushing and screening large-crystal magnesite obtained by electrically melting high-purity cryptocrystalline magnesite produced in Kamaduo Village, Leiwuqi County, Tibetan, and an impurity content is extremely low; then multi-stage grain composition is adopted for batching, a large-tonnage press is adopted for green brick forming, and sintering is performed in a tunnel kiln at a high temperature of greater than or equal to 1810 DEG C; and thus, refractoriness under load and sinterability are improved, the strength of the product is improved, and the sintered magnesite brick can meet the requirement of an ultrahigh-temperature sintering shaft kiln of more than or equal to 2100 DEG C.

Description

technical field [0001] The invention relates to a high-purity magnesia brick for an ultra-high temperature shaft kiln with a temperature greater than or equal to 2100°C and a manufacturing method thereof. Background technique [0002] A shaft kiln is a device for continuous sintering of mineral raw materials. The specific structure is a metal vertical outer cylinder with refractory material layering inside, and a combustion heating device in the middle. Minerals that need to be heated and sintered enter from the upper part and gradually fall down. It is heated and sintered during this process and is discharged from the bottom of the shaft kiln. [0003] For the refractory lining material in the shaft kiln, different refractory materials are selected according to the sintering temperature and the materials to be sintered. [0004] Magnesium-containing solid minerals that can be used to produce magnesia refractories, magnesia chemical raw materials, and magnesium metals mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B35/043C04B2235/5427C04B2235/5436C04B2235/602C04B2235/608C04B2235/606C04B2235/656C04B2235/6567C04B2235/96C04B2235/77
Inventor 姚文博张国富戚章明
Owner 河北北方窑业工程有限公司
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