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A kind of refractory powder for investment casting

A technology of investment casting and refractory powder, which is applied in casting molding equipment, casting molds, casting mold components, etc., can solve the problems of reducing solid waste discharge, low utilization rate of recycled powder, affecting the quality of mold shell and secondary recovery, etc. , to reduce the discharge of solid waste, achieve repeated recycling and reuse, good economic value and social benefits

Active Publication Date: 2021-08-13
DONGFENG PRECISION CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the 8-60 mesh sand recovered from the waste mold shell can be completely recycled as the sand for shell making, and the powder recovered from the waste mold shell is mainly 200 mesh mullite recycled powder. Silica sol or water glass will be used as a binder in the process, so the recovered powder will contain a certain amount of Na 2 O and SiO 2 , the increase in the content of these substances will affect the quality of the shell and the secondary recovery, so the recycled powder produced by using the waste shell can generally only be added according to 10-20% of the total weight of the powder, and the utilization rate of the recycled powder is low. Conducive to the reduction of solid waste emissions

Method used

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  • A kind of refractory powder for investment casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The refractory powder is prepared according to 60 parts of recycled powder, 40 parts of bauxite clinker and 3.5 parts of aluminum hydroxide.

[0026] Wherein the recovered powder is the refractory powder recovered from the discarded silica sol mold shell through the roasting process, and its Al 2 o 3 Content 20%, Fe 2 o 3 The content is not more than 1%, and the particle size is 200 mesh.

[0027] The main crystal phase of bauxite clinker is mullite, Al 2 o 3 The content is 75%, Fe 2 o 3 The content is 1.1%, the total content of CaO plus MgO is 0.4%, and the particle size is 320 mesh.

[0028] Al in aluminum hydroxide 2 o 3 The content is 66%, the burning loss is 32%, and the particle size is 500 mesh.

Embodiment 2

[0030] The refractory powder is prepared according to 75 parts of recycled powder, 25 parts of bauxite clinker and 4 parts of aluminum hydroxide.

[0031] Wherein the recovered powder is the refractory powder recovered from the discarded silica sol mold shell through the roasting process, and its Al 2 o 3 Content 30%, Fe 2 o 3 The content is 0.8%, and the particle size is 200 mesh.

[0032] The main crystal phase of bauxite clinker is mullite, Al 2 o 3 The content is 65%, Fe 2 o 3 The content is 1.2%, the total content of CaO plus MgO is 0.5%, and the particle size is 320 mesh.

[0033] Al in aluminum hydroxide 2 o 3 The content is 64.5%, the burning loss is 35%, and the particle size is 500 mesh.

Embodiment 3

[0035] The refractory powder is prepared according to 85 parts of recycled powder, 15 parts of bauxite clinker, and 2 parts of aluminum hydroxide.

[0036] Wherein the recovered powder is the refractory powder recovered from the discarded silica sol mold shell through the roasting process, and its Al 2 o 3 Content 35%, Fe 2 o 3 The content is 1%, and the particle size is 200 mesh.

[0037] The main crystal phase of bauxite clinker is mullite, Al 2 o 3 The content is 68%, Fe 2 o 3 The content is 1.4%, the total content of CaO plus MgO is 0.5%, and the particle size is 200 mesh.

[0038] Al in aluminum hydroxide 2 o 3 The content is 65%, the burning loss is 32%, and the particle size is 800 mesh.

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Abstract

The present invention proposes a refractory powder for investment casting, which includes 60-85 parts of recycled powder, 15-40 parts of bauxite clinker, and 1-4 parts of aluminum hydroxide in parts by weight. The present invention can Increase the utilization rate of recycled powder for investment casting shells to 85%, the comprehensive performance of refractory powder is equivalent to that of new mullite powder, the powder can be recycled and reused repeatedly, and the cost of refractory powder auxiliary materials for the back layer is reduced by 30‑50% , not only effectively reduces the discharge of solid waste, but also has good economic value and social benefits.

Description

technical field [0001] The invention relates to the production technology of casting mold shell refractory aggregate, in particular to a refractory powder material for investment casting produced by using recycled mold shell powder material as raw material. Background technique [0002] Investment casting is an advanced near-net-shaping process. Its main process is to repeatedly dip paint, sand and dry the surface of a disposable fusible mold to form a shell with a certain thickness. Precision castings are obtained through processes such as dewaxing, shell roasting, pouring of molten metal, solidification cooling, and shelling. However, investment casting uses one-time shells, and the cast shells are generally treated as solid waste. The production of 1 ton of qualified investment castings requires 0.5-15 tons of refractory sand powder materials. The waste shells produced in the country every year exceed How to reduce these solid waste discharges has also become one of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/00B22C9/04
CPCB22C1/00B22C9/04
Inventor 蓝勇王永华孙正荣
Owner DONGFENG PRECISION CASTING CO LTD