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Ceramsite sand used for casting and preparation method thereof

A technology of ceramsite sand and polytetrafluoroethylene, applied in the field of foundry materials, can solve the problems of polluted environment, bad grain shape of silica sand and high thermal expansion rate of silica sand

Inactive Publication Date: 2018-08-17
CHANGSHA QIUDIANBING INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural silica sand or artificially crushed silica sand has the following disadvantages in the molding and casting process: the refractory temperature is not ideal; the silica sand expands after being heated, which is easy to break and pollutes the environment; Casting defects; Silica sand, especially artificially crushed sand grains, is not good; Recycling rate is low, regeneration performance is not good
However, the foundry sand made of bauxite as the main raw material has high cost and poor recycling performance.

Method used

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  • Ceramsite sand used for casting and preparation method thereof
  • Ceramsite sand used for casting and preparation method thereof

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Effect test

preparation example Construction

[0026] A kind of preparation method of above-mentioned casting ceramsite sand, comprises the following steps:

[0027] a. Grinding the raw materials into a powder with a particle size of 500-800 meshes by pulverizing and ball milling, and stirring and mixing according to the parts by weight of the formula to obtain a powder mixture;

[0028] b. Add the powder mixture into the ball making device, spray the pre-prepared aqueous solution into the ball making device with a sprayer, and make the powder mixture into balls with a particle size of 30-60 mesh and a water content of 1.5% Granular semi-finished products;

[0029] c. Dry the pelletized semi-finished product until its water content is 0.2%, and then place it in a sintering rotary kiln for sintering at a sintering temperature of 1550-1700°C and a sintering time of 3.5-5.0 hours;

[0030] d. After the roasting is completed, crush and sieve through a 30-60 mesh sieve to obtain the ceramsite sand.

Embodiment 1

[0032] A kind of ceramsite sand for foundry, comprises following raw material: 30 mass parts of aluminum oxide, 60 mass parts of silicon dioxide, 5 mass parts of boron oxide, 4 parts of polytetrafluoroethylene, 8 parts of calcium lignosulfonate, zirconia Fiber 2 servings. The polytetrafluoroethylene has a weight average molecular weight of 5 million. The length of the zirconia fibers is 3-8 μm. A kind of preparation method of above-mentioned casting ceramsite sand, comprises the following steps:

[0033] a. Grinding the raw materials into a powder with a particle size of 650 meshes by means of pulverization and ball milling, and stirring and mixing according to the parts by weight of the formula to obtain a powder mixture;

[0034] b. Add the powder mixture into the ball making device, spray the pre-prepared aqueous solution into the ball making device with a sprayer, and make the powder mixture into a spherical semi-finished product with a particle size of 50 mesh and a wat...

Embodiment 2

[0038] A kind of ceramsite sand for casting, comprising following raw materials: 40 parts by mass of aluminum oxide, 55 parts by mass of silicon dioxide, 10 parts by mass of boron oxide, 3 parts of polytetrafluoroethylene, 10 parts of calcium lignosulfonate, zirconia Fiber 1 serving. The polytetrafluoroethylene has a weight average molecular weight of 1 million. The length of the zirconia fibers is 3-8 μm.

[0039] A kind of preparation method of above-mentioned casting ceramsite sand, comprises the following steps:

[0040] a. Grinding the raw materials into a powder with a particle size of 500 meshes by means of pulverization and ball milling, and stirring and mixing according to the parts by weight of the formula to obtain a powder mixture;

[0041] b. Add the powder mixture into the ball making device, spray the pre-prepared aqueous solution into the ball making device with a sprayer, and make the powder mixture into a spherical semi-finished product with a particle size...

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Abstract

The invention discloses ceramsite sand used for casting and a preparation method thereof and belongs to the field of polymer materials. The ceramsite sand used for casting comprises the following rawmaterials, aluminium oxide, silicon dioxide, boric oxide, polytetrafluoroethylene, calcium lignosulphonate and zirconium oxide fiber. The ceramsite sand used for casting is prepared by the steps of crushing, mixing, sintering and the like. According to the ceramsite sand, polytetrafluoroethylene, calcium lignosulphonate and zirconium oxide fiber are taken as a reinforcing system, so that the thermal expansivity and collapsibility of the ceramsite sand used for casting are reduced.

Description

technical field [0001] The invention belongs to the field of casting materials, and in particular relates to a casting ceramsite sand and a preparation method thereof. Background technique [0002] Ceramsite sand, also known as pearl sand, is an advanced substitute for quartz sand. Ceramsite sand has received widespread attention because it can overcome the shortcomings of quartz sand with large expansion coefficient, low casting precision, serious sand sticking on the surface and difficult sand cleaning, and greatly improve the quality of castings. At present, ceramsite sand for casting mainly uses high-alumina ore as raw material. There are two main preparation methods. One is to melt the raw material at high temperature, spray and atomize it to form particles, and obtain ceramsite sand with various particle sizes after screening. The other is to obtain ceramsite sand through mechanical granulation, sintering and sieving. CN1899722A discloses a new type of artificial fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02C04B35/66
CPCB22C1/02C04B35/66
Inventor 不公告发明人
Owner CHANGSHA QIUDIANBING INFORMATION TECH CO LTD
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