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A kind of foamed ceramic produced by using tailings of iron and steel plant and preparation method thereof

A technology of foamed ceramics and iron and steel plants, applied in the field of foamed ceramics and its preparation, can solve the problems of unfavorable foaming, easy melting, and low melt viscosity, so as to improve utilization rate and realize high value-added resource utilization Effect

Active Publication Date: 2021-09-28
FUJIAN DESHENG NEW BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent CN108840710A discloses a method for producing foamed ceramic building insulation materials using lithium tailings and steel slag tailings, which uses 50-60 parts of lithium tailings, 12-30 parts of steel slag tailings, and 20-30 parts of clay raw materials , 2-4 parts of foam material A and 40-50 parts of water are used as raw materials to prepare foamed ceramics with a thermal conductivity of 0.05-0.062W / m·K, but its compressive strength is only 0.55-1.0MPa
[0004] As for water slag and steel slag, since their composition contains a large amount of CaO and MgO, it is easy to melt at low temperature, and the melt viscosity formed by melting is very low, which is not conducive to foaming.

Method used

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  • A kind of foamed ceramic produced by using tailings of iron and steel plant and preparation method thereof
  • A kind of foamed ceramic produced by using tailings of iron and steel plant and preparation method thereof
  • A kind of foamed ceramic produced by using tailings of iron and steel plant and preparation method thereof

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preparation example Construction

[0051] In order to improve the various properties of the low thermal conductivity foamed ceramics of the present invention, it is also necessary to cooperate with a specific preparation method. Specifically, refer to figure 1 , the preparation method of low thermal conductivity foam ceramics in the present invention comprises the following steps:

[0052] S1: Mix various raw materials evenly according to the formula to obtain a mixture;

[0053] S2: ball milling the mixture to obtain a slurry;

[0054] Wherein, the fineness of the slurry is 250 mesh sieve <0.5%.

[0055] S3: subjecting the slurry to spray granulation to obtain a powder;

[0056] Specifically, after the slurry is stale in the slurry tank for 24 to 48 hours, it is pumped to the spray tower for spray drying and granulation; in the powder obtained by granulation, the proportion of particles above 40 mesh is ≥ 20wt%. The powder has good fluidity, which is beneficial to the subsequent distributing process.

[00...

Embodiment 1

[0068] This embodiment provides a kind of foamed ceramics produced by utilizing the tailings of iron and steel plants, and its formula is:

[0069] 50 parts of Luoyuan red tailings, 18 parts of furnace slag, 15 parts of steel slag, 8 parts of quartz sand, 6 parts of clay, 2.9 parts of foaming agent, and 0.1 part of stabilizer;

[0070] Among them, the clay is made of black mud, the foaming agent is made of recycled ceramic grinding blocks, and the stabilizer is made of MnO 2 ;

[0071] Among them, steel slag is composed of the following components: SiO 2 17.1%, Al 2 o 3 6.3%, Fe 2 o 3 38.5%, TiO 20.4%, CaO 34.2%, MgO 3.2%, K 2 O 0.05%, Na 2 O 0.25%;

[0072] Slag consists of the following components: SiO 2 67.1%, Al 2 o 3 16.9%, Fe 2 o 3 2.3%, TiO 2 0.4%, CaO2.3%, MgO0.9%, K 2 O 5.3%, Na 2 O 3.7%, LOI 1.1%;

[0073] Its preparation method is:

[0074] (1) Mix various raw materials evenly according to the formula to obtain a mixture;

[0075] (2) ball...

Embodiment 2

[0082] This embodiment provides a kind of foamed ceramics produced by utilizing the tailings of iron and steel plants, and its formula is:

[0083] 54 parts of Luoyuan red tailings, 16 parts of furnace slag, 14 parts of steel slag, 6 parts of quartz sand, 8 parts of clay, 1.8 parts of foaming agent, and 0.2 parts of stabilizer;

[0084] Among them, the clay is made of washed mud, the foaming agent is made of silicon carbide, and the stabilizer is made of MnO 2 .

[0085] Among them, steel slag is composed of the following components: SiO 2 17.1%, Al 2 o 3 6.3%, Fe 2 o 3 38.5%, TiO 2 0.4%, CaO 34.2%, MgO 3.2%, K 2 O 0.05%, Na 2 O 0.25%;

[0086] Slag consists of the following components: SiO 2 67.1%, Al 2 o 3 16.9%, Fe 2 o 3 2.3%, TiO 2 0.4%, CaO2.3%, MgO0.9%, K 2 O 5.3%, Na 2 O 3.7%, LOI 1.1%;

[0087] Its preparation method is:

[0088] (1) According to the formula, various raw materials are mixed uniformly to obtain a mixture;

[0089] (2) ball mil...

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Abstract

The invention discloses a foamed ceramic produced by using the tailing slag of a steel plant, which is mainly made of the following raw materials in parts by weight: 50-60 parts of Luoyuan red tailings, 15-20 parts of furnace slag, 10-20 parts of steel slag, quartz sand 5-10 parts, 4-10 parts of clay, 0.5-5 parts of foaming agent, 0.1-1 part of stabilizer; the sum of the parts by weight of each raw material is 100 parts; in the steel slag, CaO+MgO≥65wt%, In the slag, SiO 2 +Al 2 o 3 ≥80wt%. The invention realizes the high value-added resource utilization of the tailing slag of the iron and steel plant by compounding the steel slag and the furnace slag. Correspondingly, the present invention also discloses a method for preparing the above-mentioned foamed ceramics produced by using tailings from iron and steel plants.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a foamed ceramic produced by using tailings from iron and steel plants and a preparation method thereof. Background technique [0002] The tailings produced by iron and steel plants can be divided into three categories: water slag, furnace slag and steel slag according to the different production processes. Specifically, water slag refers to ironmaking blast furnace slag, which is rapidly cooled with water in a high-temperature molten state to become granulated foam, which is mostly used in the production of cement and concrete. Slag refers to the slag floating on the surface of the furnace in the process of pyrometallurgy, which can be used as raw materials for cement, slag bricks, slag glass, etc. Steel slag refers to the tailing slag produced after introducing oxygen to remove carbon in the steelmaking process. Due to the different production processes of thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B35/14C04B35/622
CPCC04B35/14C04B35/62204C04B38/02C04B2235/3418C04B2235/3826C04B2235/422
Inventor 朱祥辉
Owner FUJIAN DESHENG NEW BUILDING MATERIAL CO LTD
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