Magnesite activated-roasting, reselecting and silica-removing process

A magnesite and roasting technology, which is applied in the field of magnesite activation roasting gravity separation and silicon removal technology, can solve problems such as applications that are not suitable for industrial production, and achieve the effects of easy control of production process, simple process flow and strong adaptability

Inactive Publication Date: 2018-03-30
宋重本
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Application No. 200610134894.9 discloses the invention patent "Magnesite Thermal Separation Process", which provides roasting of lean magnesite ore, and then self-crushing and screening operations to remove silica, calcium oxide, partial iron oxide and alumina and other inclusion minerals, so that the MgO content of light-burned magnesium powder can reach more than 96%, and the purification effect on lean magnesite ore is obvious; however, it is not suitable for industrial production to use sieving operations to classify fine-grained ore powder.

Method used

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  • Magnesite activated-roasting, reselecting and silica-removing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw ore of magnesite lean ore is taken from Zhengda Mine in Pailou, Haicheng. It is a third-grade magnesite ore with a MgO content of 46.0%, SiO 2 content of 2.5%, other impurities content of 0.7%;

[0028] 1) Set MgO content to 46.0%, SiO 2 The magnesite with a content of 2.5% is fed into the crushing and screening operation to obtain raw ore with a particle size of 0mm to 30mm;

[0029] 2) Add 9% magnesium oxide fine powder with a particle size of -325 mesh, 1% magnesium chloride and 10% water as an activator to the raw ore, stir evenly, and press it through a brick making machine under 2 atmospheric pressure. Billet;

[0030] 3) Put the billet into a drying oven at 160°C for 12 hours to dry and dehydrate;

[0031] 4) Put the dried slab with a moisture content of 5% into a shaft kiln at 950°C for 2.5 hours for activation and roasting, the MgCO in the slab 3 decomposed and activated to SiO 2 MgO powder with mineral particles dissociated, but still agglomerated...

Embodiment 2

[0036] The raw ore is taken from the flotation tailings of the Haicheng Magnesium Mine with a particle size greater than 200 mesh as raw materials, with MgO content of 44.0%, SiO 2 content of 5.7%, other impurities content of 1.8%.

[0037] 1) When MgO content is 44.0%, SiO 2 Add 8% magnesium oxide fine powder with a particle size of -325 mesh to the flotation tailings of Haicheng magnesium mine with a content of 5.7%, add 0.8% magnesium chloride and 12% water as an activator, stir evenly, Next, it is pressed into a billet by a brick making machine;

[0038] 2) Place the billet into a drying oven at 160°C for 12 hours to dry and dehydrate;

[0039] 3) Put the dried slab with a moisture content of 5% into a shaft kiln at 1000°C for activation and roasting for 2 hours, the MgCO in the slab 3 Activated with SiO 2 MgO powder with mineral particles dissociated, but still agglomerated with it; the activator of magnesium oxide, magnesium chloride and water added before magnesite ...

Embodiment 3

[0044] The raw ore of magnesite lean ore is taken from Jinding Huayu Mine in Haicheng, which is a third-grade magnesite ore with a MgO content of 45.8%, SiO 2 The content is 2.8%, and the content of other impurities is 0.6%.

[0045] 1) Set MgO content to 45.8%, SiO 2 The magnesite lean ore with a content of 2.8% is fed into the crushing and screening operation to obtain raw ore with a particle size of 0mm to 30mm;

[0046] 2) Add 9% magnesium oxide fine powder with a particle size of -325 mesh, 1% magnesium chloride and 10% water as an activator to the raw ore, stir evenly, and press it through a brick making machine under 2 atmospheric pressure. Billet;

[0047] 3) Put the billet into a drying oven at 160°C for 12 hours to dry and dehydrate;

[0048] 4) Put the dried slab with a moisture content of 5% into a shaft kiln at 1100°C for activation and roasting for 2 hours, the magnesite mineral MgCO in the slab 3 Activated with SiO 2 MgO powder with mineral particles dissoc...

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Abstract

The invention relates to a magnesite activated-roasting, reselecting and silica-removing process. The magnesite activated-roasting, reselecting and silica-removing process is characterized by comprising the following steps that lean magnesite is crushed and screened to obtain raw magnesite having the granularity of 0-30 mm; 5%-10% of fine magnesium oxide powder is added into the raw magnesite, 0.5%-1% of magnesium chloride and 7%-12% of water are added, even stirring is performed, mechanical pressing is performed to form magnesite blanks, the blanks are put in a drying furnace for drying and dehydration; then, the blanks are put in a shaft kiln of 900-1100 DEG C, and activated roasting is performed for 1.5-2.5 hours; the roasted magnesite blanks are fed into a mill to be stirred and ground; air classification is conducted on the ground products, the products greater than 500 mesh are impurities, the products smaller than 500 mesh are directly fed into a cyclone dust collector for gas-solid separation, and a magnesium oxide product having the obtained magnesium oxide content of 96.6% or above and the SiO2 content lower than 0.32% is obtained. Compared with the prior art, the magnesite activated-roasting, reselecting and silica-removing process has the advantages of being simple in technological process, good in raw ore adaptability, suitable for industrial production, low in cost and low in investment.

Description

technical field [0001] The invention belongs to the technical field of magnesite beneficiation, and in particular relates to a magnesite activation, roasting, gravity separation and silicon removal process for separating lean magnesite ore. Background technique [0002] Our country is rich in magnesite resources, but there are not many rich ore resources. The gangue minerals contained in magnesite are mainly SiO 2 , other impurities such as CaCO 3 , Fe 2 o 3 , Al 2 o 3 The equivalent content is relatively small. According to the "Compilation of Refractory Materials Standards", magnesite is based on the MgO and SiO in the ore 2 The content of the special grade ore is classified, the content of MgO in super ore is > 47%, and the content of SiO 2 content <0.3%; primary ore MgO content> 46.5%, SiO 2 Content<0.6%, secondary ore MgO content>46%, SiO 2 content <1.5%; tertiary ore MgO content> 45%, SiO 2 Content<2.5%; MgO content<45%, SiO 2 Mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
CPCC04B2/102
Inventor 宋重本
Owner 宋重本
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