A kind of precision casting sand and preparation method thereof

A technology of precision casting and casting sand, which is applied in the field of precision casting sand and its preparation, which can solve the problems of low yield, high cost, and high energy consumption, and achieve the effects of high yield, strong resistance to crushing, and low energy consumption

Inactive Publication Date: 2015-12-02
张希君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pearl sand is obtained by melting bauxite and then spraying and cooling, which has high energy consumption, low yield (due to the difficulty in controlling the particle size of the spraying method), generally less than 50%, low output, and low cost. high defect

Method used

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  • A kind of precision casting sand and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of precision casting sand includes the following steps:

[0019] (1) Preparation of mixed powder: a. Grind bauxite, clay, manganese ore, and hematite into 325 mesh fine powder with a pass rate greater than 99% (mass percentage, the same below), and mix according to the following mass percentages: 79% of bauxite, 20% of clay, 0.5% of manganese ore, 0.5% of hematite, mix evenly to obtain mixed powder 1; b. Grind bauxite, clay, manganese ore, and hematite into 325 meshes and pass For fine powder with a rate greater than 99%, mix it in the same proportion as the mixed powder 1, and then grind it to D50<6μm to obtain mixed powder 2;

[0020] (2) Granulation: Put the mixed powder 1 into the granulation pot, rotate at a constant speed and spray (water mist, the same below) to granulate, and select the qualified particles after screening according to the production requirements {according to the sintering shrinkage rate In the case, it should be slightly larg...

Embodiment 2

[0024] The preparation method of precision casting sand includes the following steps:

[0025] (1) Preparation of mixed powder: a. Crush bauxite, clay, manganese ore, and hematite into pieces smaller than 10mm, and mix them according to the following mass percentages: bauxite 95%, clay 3%, manganese ore 1%, hematite 1%, after mixing, grind into 325 mesh fine powder with a pass rate of more than 99% to obtain mixed powder 1; b. Crush bauxite, clay, manganese ore, and hematite into less than 10mm The broken pieces of powder are mixed in the same proportion as the mixed powder 1, and then ground until the 325 mesh pass rate is greater than 99% and the D50 is less than 6 microns to obtain mixed powder 2;

[0026] (2) Granulation: Put the mixed powder 1 into the granulation pot, rotate at a constant speed and granulate under the action of spraying. According to the production requirements, put the qualified particles after screening into the granulation pot and rotate at a constant spee...

Embodiment 3

[0030] The preparation method of precision casting sand includes the following steps:

[0031] (1) Preparation of mixed powder: a. Grind bauxite, clay, manganese ore, and hematite into 325 mesh fine powder with a pass rate of more than 99%, and mix it according to the following mass percentages: bauxite 88%, clay 6.8%, manganese ore 5%, hematite 0.2%, mixed evenly to obtain mixed powder 1; b. Crush bauxite, clay, manganese ore, and hematite into pieces smaller than 10mm, and press the mixed powder 1 After the same proportion of ingredients, grind until the 325 mesh pass rate is greater than 99% and D50<6 microns, to obtain mixed powder 2;

[0032] (2) Granulation: Put the mixed powder 1 into the granulation pot, rotate at a constant speed and granulate under the action of spraying. According to the production requirements, put the qualified particles after screening into the granulation pot and rotate at a constant speed. Add mixed powder 2 for the first time under the action of s...

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Abstract

The invention belongs to the technical field of precision casting and specifically relates to precision casting sand and a preparation method thereof. The precision casting sand is prepared from the following materials in percentage by weight: 79%-95% of bauxite, 3%-20% of clay, 0.5%-5% of manganese ore and 0.2%-1% of hematite. The preparation method is as follows: materials are crushed and then prepared into mixed powder, and the precision casting and is formed by pelletizing, drying and burning. The preparation method disclosed by the invention is low in energy consumption, high in yield and low in cost; the prepared precision casting sand is high in crush resistance, aluminum oxide content stability and volume density (smaller) are obviously superior to those of nice foundry sand, regeneration utilization rate of the casting sand can be greatly improved, and economic benefits are improved for blowing production cost of casting enterprises. And therefore, the precision casting sand has very good market prospect.

Description

Technical field [0001] The invention belongs to the technical field of precision casting, and specifically relates to a sand for precision casting and a preparation method thereof. Background technique [0002] In the casting process, Metropolis first selects suitable casting materials (generally foundry sand accounts for more than 70%) for casting before casting. Therefore, the selection of casting sand is also very critical for casting, especially precision casting. At present, due to the impact of environmental protection and occupational health requirements, the amount of silica sand is rapidly decreasing. The high refractoriness and low volume density of the pearl sand (the main component is corundum) is favored by precision casting companies, and the amount is increasing rapidly. However, the pearl sand is obtained by fusing the bauxite and then spraying and cooling it. It has high energy consumption and low yield (because the particle size of the spray method is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 张希君张帆张倩
Owner 张希君
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