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Semi-coke powder, molding sand containing semi-coke powder and application in casting

A technology of blue carbon powder and molding sand, which is applied in the field of materials science, can solve the problems of polluting the environment, high production cost, affecting the yield of castings and mechanical properties of castings, etc., and achieves the effects of low sulfur content, low cost, and environmental protection in the preparation process.

Inactive Publication Date: 2018-07-31
哈尔滨市易合铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems that the use of casting coal powder in casting affects the yield of castings and the mechanical properties of castings, and at the same time, the production cost is high and the environment is polluted, the present invention provides a blue carbon powder, molding sand containing the substitute and its application in casting

Method used

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  • Semi-coke powder, molding sand containing semi-coke powder and application in casting
  • Semi-coke powder, molding sand containing semi-coke powder and application in casting
  • Semi-coke powder, molding sand containing semi-coke powder and application in casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of blue charcoal powder:

[0029] (1) Dehydrate semi-coke (also known as semi-coke, coke powder) to a water content of 1 (wt)%, crush and sieve to a particle size of 180 mesh; the above-mentioned dehydration refers to natural drying.

[0030] (2) Dehydrate semi-coke (also known as semi-coke, coke powder) to a water content of 10 (wt)%, crush and sieve to a particle size of 200 mesh; the above-mentioned dehydration refers to drying at 100°C in a drying tower.

[0031] (3) Dehydrate semi-coke (also known as semi-coke, coke powder) to a water content of 10 (wt)%, crush and sieve to a particle size of 200 mesh; the above-mentioned dehydration refers to drying at 150°C in a drying tower.

[0032] The blue charcoal powder that table 1 embodiment 1 (one)-(three) prepares, main technical indicator:

[0033] project

[0034] It can be seen from the above table that the various technical indicators of blue coal powder are better than ordinary foundry coal p...

Embodiment 2

[0036] Preparation of sand with blue charcoal powder:

[0037] The blue charcoal powder that present embodiment uses is the blue charcoal powder that embodiment 1 (two) prepares.

[0038] (1) By reusing sand, new sand, bentonite (red volcanic sodium-based bentonite), blue charcoal powder according to 95 parts of recycled sand, 2 parts of new sand, 0.33 part of bentonite, after dry mixing the ratio of parts by weight of blue charcoal powder 0.2 part, Add 2% of the total weight of water and wet mix to obtain the molding sand containing semi-coke powder. All the above-mentioned raw materials except semi-coke are crushed and sieved before dry mixing, and the sieving is 80-mesh sieve.

[0039] (2) By reusing sand, new sand, bentonite (red volcanic sodium-based bentonite), blue charcoal powder according to 95 parts of recycled sand, 2 parts of new sand, 0.33 part of bentonite, after dry mixing the ratio of parts by weight of blue charcoal powder 0.2 part, Add 2% of the total weigh...

Embodiment 3

[0049] Molding sand containing blue carbon powder is used for castings:

[0050] The molding sand used in this embodiment is the molding sand prepared in Example 2 (5).

[0051] The steps are: (1) Modeling: using molding sand containing blue charcoal powder for molding; (2) pouring; (3) boxing and sand cleaning.

[0052] The specific operation of the molding is as follows: the mechanical sand mixing line mixes the sand, shakes out the sand, transports it to the molding line, performs mechanical molding, and obtains a sand mold.

[0053] The specific operation of the pouring is: burn the molten iron, pour the molten iron into the mold cavity, align the gate of the sprue cup when pouring, the pouring temperature is 1400°C, and entrain air during pouring, the pouring operation time is 7min, the sprue cup Take out the molten iron in the container after it solidifies, and place the pressed iron for 1 hour.

[0054] The specific operations of boxing and sand cleaning are as follows:...

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Abstract

The invention relates to semi-coke powder, molding sand containing the semi-coke powder and application in casting and belongs to the field of material science, in particular to casting materials andcasting processes. The water content of the semi-coke powder is 1(wt)%-10(wt)%, and the particle size of the semi-coke powder is 180-200 meshes. The molding sand is fabricated by mixing reuse sand, new sand, bentonite and the semi-coke powder and can be used for casting. By means of the semi-coke powder or the molding sand provided by the invention for casting, the used materials are less, the cost is low, ash content and sulphur content are low, the problems that ash ingredients block molding sand gaps and absorb large amounts of water to form casting air holes or casting sand holes and the like do not exist, the quality of castings is made to be improved, and meanwhile, the workshop environment is improved to a great extent and the environmental pollution is reduced at the same time.

Description

technical field [0001] The invention relates to the field of material science, in particular to casting materials and casting techniques. Background technique [0002] At present, casting coal powder is generally used in the wet casting production of cast iron in the foundry industry at home and abroad. The amount of coal powder added in casting varies according to the casting size, alloy material and molding method, generally 3-8%. But casting coal powder still has some disadvantages, such as high ash and sulfur content in coal powder. The ash and sulfur in the coal powder are harmful substances, and the ash blocks the voids of the molding sand and absorbs a large amount of water. Under the high temperature of molten metal, moisture forms a gas phase and expands rapidly. Excessively expanded gas is difficult to discharge from the sand grains and enters the molten metal to form pores in the casting, or the gas will burst and fall off the surface of the molding sand to form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 周义
Owner 哈尔滨市易合铸造材料有限公司
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