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Method for preparing iron tailing porous ceramic through foam-gelcasting/low-temperature sintering

A technology of low-temperature sintering and porous ceramics, which is applied in the direction of ceramic products, ceramic material production, clay products, etc. It can solve the problems of low porosity and uneven pore size distribution of porous ceramics, and achieve controllable forming parameters, good physical properties and mechanical properties. performance, effect of small pore size

Active Publication Date: 2017-06-13
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent "a porous ceramic material for iron tailings and its preparation method" (application number 201410211221.3) is a process for preparing porous ceramics with an iron tailings content of 45-65% by adding a pore-forming agent, but the porosity of the porous ceramics prepared by this method is Low, uneven pore size distribution

Method used

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  • Method for preparing iron tailing porous ceramic through foam-gelcasting/low-temperature sintering
  • Method for preparing iron tailing porous ceramic through foam-gelcasting/low-temperature sintering
  • Method for preparing iron tailing porous ceramic through foam-gelcasting/low-temperature sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Iron tailings: The raw materials used in this example are muddy fine-grained iron tailings produced by Shouyun Mining Group Co., Ltd. in Miyun District, Beijing after iron ore selection in 2015. The particle size distribution is 0.3-130 μm, and the diameter is 2 , 14.7wt% Fe 2 o 3 , 8.7wt% MgO, 6.8wt% Al 2 o 3 , 6.6wt% CaO, 1.6wt% K 2 O, 1.5 wt% other components.

[0051] Weigh 45g of iron tailings powder, 90g of agate balls, and 55ml of deionized water, and put them into a ball mill tank for roller milling and mixing for 22 hours to prepare a slurry with a tailings content of 45wt%. Weigh 5.5g of organic monomer, 0.55g of crosslinking agent and 0.8g of dispersant and inject into the slurry to continue ball milling for 2 hours. Weigh 0.1 g of foaming agent and 0.02 g of foam stabilizer and inject into the slurry, and mechanically stir for 10 minutes at a stirring speed of 1200 r / min for foaming. Weigh 1.25g of catalyst and 0.6g of initiator into the foam-containing...

Embodiment 2

[0057] Iron tailings: the raw materials used in this embodiment are the same as in embodiment 1.

[0058] Weigh 30g of iron tailings powder, 60g of agate balls, and 70ml of deionized water, and put them into a ball mill tank for roller milling and mixing for 6 hours to prepare a slurry with a tailings content of 30wt%. Weigh 7g of organic monomer, 0.7g of crosslinking agent and 0.2g of dispersant and inject into the slurry to continue ball milling for 12 hours. Weigh 0.15 g of foaming agent and 0.04 g of foam stabilizer and inject into the slurry, and mechanically stir for 20 minutes at a stirring speed of 650 r / min for foaming. Weigh 1.75g ​​of catalyst and 0.3g of initiator into the foam-containing slurry and stir evenly. Pour the slurry into a glass mold. After the slurry gel is formed, it is demolded and dried. Put the formed body into a muffle furnace, raise the temperature to 900° C. for 2 hours, then raise the temperature to 1050° C. and keep it for 12 hours to prepare...

Embodiment 3

[0061] Iron tailings: The raw material used in this example is the muddy fine-grained iron tailings produced by Shouyun Mining Group Company in Miyun District, Beijing after iron ore selection in 2016. The particle size distribution is between 0.2 μm and 180 μm. Particles of 58 μm accounted for 90%, and the average particle size was 12.4 μm. The mass percentage of tailings composition is as follows: 56.3wt% SiO 2 , 13.5wt% Fe 2 o 3 , 9.6wt% MgO, 8.9wt% Al 2 o 3 , 7.2wt% CaO, 2.8wt% K 2 O, 1.7 wt% other components.

[0062] Weigh 40g of iron tailings powder, 80g of agate balls, and 60ml of deionized water, and put them into a ball mill tank for roller milling and mixing for 12 hours to prepare a slurry with a tailings content of 40wt%. 4g of organic monomer, 0.4g of crosslinking agent and 1.8g of dispersant were weighed and injected into the slurry to continue ball milling for 10 hours. Weigh 0.08g of foaming agent and 0.02g of foam stabilizer and inject into the slurry,...

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Abstract

The invention discloses a method for preparing iron tailing porous ceramic through foam-gelcasting / low-temperature sintering. The method comprises the following steps: uniformly mixing iron tailing powder and deionized water through a ball milling method to prepare slurry; injecting an organic monomer, crosslinking agent and dispersing agent into the slurry, and further performing ball milling; adding foaming agent and foam stabilizer into the slurry subjected to ball milling, and mechanically stirring at a high speed to enable the slurry to foam; injecting initiator and a catalyst into the foaming slurry, uniformly stirring, pouring the slurry into a mold, performing gelcasting, demolding, and drying; putting the dried porous body in a muffle furnace, and sintering at a temperature lower than 1120 DEG C to obtain the iron tailing porous ceramic. By using the method to prepare the porous ceramic, the solid waste utilization ratio is high; harm of iron tailings to the environment can be effectively relieved; the prepared porous ceramic has the advantages of high porosity, small pore diameter, uniform distribution, controllable casting parameters, low sintering temperature and the like; and the porous ceramic has favorable physical property and mechanical property.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a method for preparing porous ceramics from iron tailings. More specifically, the invention relates to a method for preparing porous ceramics from iron tailings by foam pouring forming-low temperature sintering process. Background technique [0002] Iron tailings are solid wastes that are discharged after iron ore is selected through a beneficiation process to select iron concentrate. my country's crude steel output has been ranked first in the world for many years. With the increase of steel production capacity, the demand for iron ore continues to increase, and the iron tailings produced are also increasing. According to the "Annual Report on China's Comprehensive Utilization of Resources (2014)" issued by the National Development and Reform Commission, as of the end of 2013, the cumulative stock of tailings in my country was 14.6 billion tons, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B33/132
CPCC04B33/132C04B38/0054C04B38/10C04B2235/6023C04B2235/656C04B2235/658C04B2235/77C04B2235/96Y02P40/60
Inventor 周洋李润丰孙智勇魏述燕李翠伟李世波黄振莺翟洪祥
Owner BEIJING JIAOTONG UNIV
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