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A kind of recycled casting coated sand using waste sand as raw material and its preparation process

A technology of coated sand and raw materials, which is used in casting molding equipment, manufacturing tools, machinery for cleaning/processing of casting materials, etc. cost, the effect of reducing the amount of consumption

Active Publication Date: 2021-06-22
福建省同兴汽车同步器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The commonly used shell and core sands for cast steel, iron and non-ferrous metal parts in the prior art mainly include furan resin sand, phenolic resin, etc. After these resin sands are cast, the surface finish of the castings is superior, and the sand falling is happy, which arouses the admiration of the foundry industry, but The resin contains high toxic content of formaldehyde, benzene, free phenol, etc., and the curing agent of hexamethylenetetramine, ammonium chloride and urea contains high S content. Occasionally produce irritating odor and smoke to pollute the working environment

Method used

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Examples

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Effect test

preparation example Construction

[0025] A preparation process of recycled coated sand using waste sand as raw material, comprising the following steps:

[0026] Step 1: Crushing the waste sand through 70-140 mesh sand, winnowing until the dust content ≦0.15%, water content ≦5%, put it into the mixer with a stirring speed of 50-80r / min, add modifier and stir 3-5min, take out to constant weight, get modified sand;

[0027] Step 2: Heat the modified sand to 80-150°C, add resole phenolic resin, ethyl acetate solution, flake graphite, and magnesium oxide in sequence, mix and stir evenly;

[0028] Step 3, drying the mixed sand until the water content is ≦1.5%, to obtain the regenerated foundry coated sand.

Embodiment 1

[0030] A recycled foundry coated sand using waste sand as raw material, including the following raw materials in parts by weight: 90 parts of waste foundry sand shell mold, 1.2 parts of resole phenolic resin, 12 parts of ethyl acetate solution, 4 parts of aluminum dihydrogen phosphate solution , 0.3 parts of flake graphite, and 0.7 parts of magnesium oxide.

[0031] Specifically, the ethyl acetate solution is an ethyl acetate solution with a mass concentration of 83%, and the aluminum dihydrogen phosphate solution is an aluminum dihydrogen phosphate solution with a mass concentration of 45%.

[0032] A preparation process of recycled coated sand using waste sand as raw material, comprising the following steps:

[0033] Step 1: Crushing the waste sand through 70 mesh sand, winnowing until the dust content ≦0.15%, water content ≦5%, put it into the mixer with a stirring speed of 80r / min, add the modifier and stir for 5min, take it out until Constant weight, get modified sand; ...

Embodiment 2

[0041] A recycled foundry coated sand using waste sand as raw material, including the following raw materials in parts by weight: 100 parts of waste sand core, 1.5 parts of resole phenolic resin, 16 parts of ethyl acetate solution, 6 parts of aluminum dihydrogen phosphate solution, scale 0.8 parts of graphite, 1 part of magnesium oxide.

[0042] Specifically, the ethyl acetate solution is an ethyl acetate solution with a mass concentration of 83%, and the aluminum dihydrogen phosphate solution is an aluminum dihydrogen phosphate solution with a mass concentration of 45%.

[0043] A preparation process of recycled coated sand using waste sand as raw material, comprising the following steps:

[0044] Step 1: Crushing the waste sand through 140 mesh sand, winnowing until the dust content ≦0.15%, water content ≦5%, put it into the mixer with a stirring speed of 50r / min, add the modifier and stir for 3 minutes, take it out until Constant weight, get modified sand;

[0045] Step 2...

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PUM

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Abstract

A regenerative casting sand and preparation process with waste sand as the raw material, and a regenerative casting sand with waste sand as the raw material, including the following raw materials: waste sand, adhesive, modified curing agent, modified modification, modified modificationThe lubricant, thermal conductivity, the modified curing agent is acetate acetate solution, the modifier is a dihydrous aluminum solution, and the prepared regenerative casting membrane sandwich sand is detected by 30.5MPa, the viscosity is 500‑1800MPA / s, the shell and core heating and curing time 90‑130 / s, the hardening effect is good.

Description

technical field [0001] The invention belongs to the field of coated sand preparation, and in particular relates to recycled casting coated sand using waste sand as a raw material and a preparation process thereof. Background technique [0002] The commonly used shell and core sands for cast steel, iron and non-ferrous metal parts in the prior art mainly include furan resin sand, phenolic resin, etc. After these resin sands are cast, the surface finish of the castings is superior, and the sand falling is happy, which arouses the admiration of the foundry industry, but The resin contains high toxic content of formaldehyde, benzene, free phenol, etc., and the curing agent of hexamethylenetetramine, ammonium chloride and urea contains high S content. Occasionally produce irritating odor and smoke to pollute the working environment. The most serious thing is that it takes ≧1 ton of resin sand to produce 1 ton of castings (equivalent to increasing the cost of ≧1150 yuan). Any ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/22B22C1/02B22C5/04B22C5/08
CPCB22C1/02B22C1/2253B22C5/0409B22C5/08
Inventor 洪宝山洪清河
Owner 福建省同兴汽车同步器有限公司