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Refractory foundry sand and preparation method thereof

A foundry sand and refractory technology, applied in the field of foundry sand, can solve problems such as underutilization, waste of resources, and poor management

Active Publication Date: 2018-12-21
GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annual output of casting dust in our country is nearly one million tons. These dusts need to be piled up in a huge site. If they are not managed well or not fully utilized, it will not only waste resources in vain, but also cause serious pollution.

Method used

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Examples

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Effect test

preparation example Construction

[0040] The present invention provides a method for preparing refractory foundry sand described in the above technical solution, comprising the following steps:

[0041] Mix 250 parts of casting dust, 250 parts of fly ash, 10-50 parts of kaolin and 0-25 parts of slag to obtain powder;

[0042] Mix 25-50 parts of alkali activator and 150-200 parts of water to obtain activator solution;

[0043] Granulating the powder while spraying the activator solution to obtain pellets;

[0044] The pellets are subjected to wet curing and drying in sequence to obtain refractory foundry sand.

[0045] The main raw materials of the method are foundry dust and fly ash. Compared with the raw material-bauxite used in the preparation of pearl sand for foundry at present, it has the advantage of raw material cost. At the same time, the preparation method does not pass sintering, which reduces production energy consumption costs. Greatly reduce business operating costs.

[0046] In the present inv...

Embodiment 1

[0056] According to the parts by weight of 250 parts of foundry dedusting dust, 250 parts of fly ash, 50 parts of metakaolin, 25 parts of alkali activator, the alkali activator comprises NaOH and water glass that the mass ratio is 1:3.5, The modulus of water glass is 2.5; 25 parts of alkali activator are dissolved in 200 parts of water to form alkali activator solution. Put the foundry dust, fly ash and kaolin into the mixer and stir for 5-15 minutes to mix them evenly to obtain powder; then put the evenly stirred powder into the disc granulator, and use the disc granulator The machine rotates and sprays the atomized alkali activator solution to granulate the mixture to obtain balls with a particle size of 30-70 mesh. After the molded balls are cured for 24 hours under the conditions of humidity ≥ 90% and temperature of 70°C, the balls are transferred to a constant temperature box with a temperature of 120°C for drying. After the balls are completely dried, refractory foundry ...

Embodiment 2

[0058] According to the parts by weight of 250 parts of foundry dust removal, 250 parts of fly ash, 25 parts of metakaolin, 25 parts of slag, and 25 parts of alkali activator, the alkali activator includes KOH with a mass ratio of 1:3.8 And water glass, the modulus of water glass is 2.5; 25 parts of alkali activator are dissolved in 200 parts of water to form alkali activator solution. Put the foundry dust, fly ash, kaolin, and slag into the mixer and stir for 5-15 minutes to make them evenly mixed. Then put the uniformly stirred powder into a pan granulator, use the pan granulator to rotate and spray the atomized alkali activator solution to granulate the mixture, and obtain balls with a particle size of 30-70 mesh. After the molded balls are cured for 16 hours under the conditions of humidity ≥ 90% and temperature of 70°C, the balls are transferred to a thermostat with a temperature of 120°C for drying. After the balls are completely dried, refractory foundry sand is obtaine...

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Abstract

The invention provides refractory foundry sand and a preparation method thereof. The foundry sand is prepared from the following raw materials in parts by weight: 250 parts of casting fly ash, 250 parts of fly ash, 10 to 50 parts of kaolin, 25 to 50 parts of an alkali activator, 150 to 200 parts of water and 0 to 25 parts of mineral waste residues, wherein the casting fly ash is prepared from 0.5to 3.5 weight percent of volatile components, 9 to 11 weight percent of CaO, 68 to 72 weight percent of SiO2 and 13 to 14 weight percent of Fe2O3; the fly ash is prepared from 30 to 35 weight percentof Al2O3, 40 to 50 weight percent of SiO2, 5 to 7 weight percent of CaO and 5 to 6 weight percent of F2O3.The refractory foundry provided by the invention is prepared by taking the casting fly ash andthe fly ash as base materials and taking the alkali activator and the water as additives; by the full use of the casting fly ash, the pollution to environment due to mass discharge of the casting flyash is avoided; in addition, the refractory foundry sand has the advantages of higher refractoriness, lower density, higher strength, as well as low-cost and easily-obtained raw materials.

Description

technical field [0001] The invention belongs to the technical field of foundry sand, in particular to a refractory foundry sand and a preparation method thereof. Background technique [0002] At present, the foundry sand used by foundry enterprises can be roughly divided into two categories, one is silica sand, and the other is pearl sand and ceramsite sand prepared by high-temperature melting using bauxite as raw material. The mining of foundry silica sand destroys natural mineral resources. The production of pearl sand not only consumes a large amount of bauxite mineral resources, but also consumes a lot of energy in the production process, which leads to a substantial increase in the cost of pearl sand. [0003] Foundry dedusting ash is a powdery mixture collected by the dust removal system in various processes in the sand casting production process of iron castings in the foundry workshop. The molding materials used in sand casting in foundry production are mainly quartz...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B33/132C04B33/135C04B33/138C04B33/13
CPCC04B33/131C04B33/132C04B33/1352C04B33/138C04B35/66Y02P40/60
Inventor 常杰善王光张宏生窦明岳孟祥明
Owner GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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