Coal powder for environment-friendly wet mold casting and preparation method thereof

An environmentally friendly, pulverized coal technology, which is applied in foundry molding equipment, cores, molds, etc., can solve the problems of easy environmental pollution, occupational diseases, and high processing costs caused by sand waste, and achieve improved surface finish, improved operating environment, Good reusability

Active Publication Date: 2022-01-04
姚立猛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems to be solved by this invention are: the existing molding sand additives use many raw materials, the proportion is complicated, and the processing cost is high, and the existing molding sand additives are added with chemical raw materials, workers are prone to occupational diseases after long-term contact, and it is easy to discharge molding sand waste directly. polluted environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0030] The coal powder for environment-friendly wet casting in this embodiment is composed of raw coal powder and dust-proof slurry, and the dust-proof slurry is uniformly dispersed in the raw coal powder, and the weight of the dust-proof slurry is 3% of the weight of the raw coal powder. The raw coal powder is coal powder obtained by drying, crushing and sieving raw coal.

[0031] Described dustproof slurry is the mixture of 20wt% polyvinyl alcohol aqueous solution, 70wt% xylitol syrup, 30% sodium carboxymethylcellulose aqueous solution and 70wt% fructose syrup, and this mixture is slurry; Wherein polyvinyl alcohol aqueous solution, The mass ratio of xylitol syrup, sodium carboxymethylcellulose aqueous solution and fructose syrup is 3:3:2:2.

[0032] The xylitol syrup is an alcohol-water mixed solution of xylitol, and the solvent is an alcohol-water mixture. The specific type of alcohol is determined by the supplier's process. The xylitol syrup of the present embodiment is co...

Embodiment 2）

[0057] All the other are the same as embodiment 1 for the environment-friendly wet casting coal powder of the present embodiment, the difference is:

[0058] In the environment-friendly coal powder for wet casting in this embodiment, the weight of the dust-proof slurry is 4% of the weight of the original coal powder.

[0059] Described anti-dust slurry is industrial grade 70wt% xylitol syrup.

[0060] During preparation, 1000kg of raw coal powder is put into a mixer, 40kg of xylitol syrup is added to the mixer, mixed evenly, discharged and cooled, and packaged to obtain environmentally friendly coal powder for wet casting.

[0061] The pulverized coal of the present embodiment is tested according to the method described in Example 1, and the test results are as follows:

[0062] (1) Dust test.

[0063] Test results: 75g of environmentally friendly pulverized coal was collected in Dust Zone 1, but not in Dust Zone 2 and Zone 3.

[0064] (2) Airflow delivery test.

[0065] T...

Embodiment 3）

[0069] All the other are the same as embodiment 1 for the environment-friendly wet casting coal powder of the present embodiment, the difference is:

[0070] In the environment-friendly coal powder for wet casting in this embodiment, the weight of the dust-proof slurry is 5% of the weight of the original coal powder.

[0071] The dust-proof slurry is 50wt% to 75wt% (70wt% in this embodiment) α-starch aqueous solution, 70wt% fructose syrup (the solvent in fructose syrup is a mixture of alcohol and water, wherein the water mass fraction is 12wt%, alcohol The mass fraction is 18wt%, the alcohol is a mixture of methanol, ethanol or isopropanol or other alcohols, determined by the supplier's process), and the mixed aqueous solution is slurry; the mass ratio of 70wt% α-starch aqueous solution and 70wt% fructose syrup is 1:1.

[0072] Preparation method Referring to the preparation method of coal powder in Example 1, in the pre-preparation stage, α-starch was dissolved in hot water ...

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PUM

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Abstract

The invention discloses an environment-friendly wet mold casting coal powder, which is composed of raw coal powder and dust-proof slurry, the dust-proof slurry and the raw coal powder are evenly dispersed, and the weight of the dust-proof slurry is 2 times the weight of the raw coal powder. %~8%; the dustproof slurry is a solution of polyvinyl alcohol, xylitol, cellulose compounds, α-starch, monosaccharide or disaccharide, or a solution of polyvinyl alcohol, xylitol, cellulose A mixed solution of two or more of compounds, alpha-starch, monosaccharides or disaccharides. The pulverized coal for wet casting of the invention has a low dust fugitive rate, basically does not fugitive dust when it is dry mixed with raw sand, clay, etc., solves the problem of blackness and dirt, and improves the working environment.

Description

technical field [0001] The invention relates to coal powder, in particular to an environment-friendly coal powder for wet casting and a preparation method thereof. Background technique [0002] Green casting is the most widely used and most convenient molding method, and green sand accounts for about 60% to 70% of all sand mold usage. [0003] Green sand is composed of raw sand, clay, additives and water in a certain proportion. Coal powder for green casting is an add-on in green sand. It is made of coal as raw material after crushing. Its function is to prevent sand sticking and sand inclusion scarring in iron castings and improve the collapsibility of molding sand. Coal powder content in green sand is usually 3% to 8%. [0004] The reason why coal powder has the ability of anti-sticking sand and anti-sand inclusion is that the volatile matter in coal powder can be pyrolyzed into a layer of shiny carbon film at high temperature. It acts as a physical barrier, and at the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/02B22C5/04B22C5/08
CPCB22C1/02B22C5/08B22C5/0409
Inventor 姚立猛
Owner 姚立猛
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