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Waste sand regeneration method reducing regeneration sand acid consumption value

A technology of acid consumption value and regenerated sand, which is used in the cleaning/processing machinery of casting materials, casting molding equipment, metal processing equipment, etc., which can solve the problem that secondary pollution cannot be effectively controlled and increase the cost of regeneration equipment. , reduce the acid consumption value research and elaboration and other issues, to achieve the effect of good technical feasibility and applicability, compact and reasonable process structure, reducing demand and waste of water resources

Inactive Publication Date: 2018-07-27
HEFEI RENCHUANG CASTING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process will increase the further investment in the cost of recycling equipment, increase the energy consumption of the equipment, and bring greater difficulties to the later maintenance of the equipment, resulting in a sharp increase in casting production costs
In the process of wet regeneration, although the effect of reducing the acid consumption value is good, there is no systematic research and elaboration on reducing the acid consumption value
In the wet regeneration process, the investment in equipment is large, the required site is large, and the water consumption is high. The secondary pollution generated in the wet regeneration process cannot be effectively controlled.

Method used

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  • Waste sand regeneration method reducing regeneration sand acid consumption value
  • Waste sand regeneration method reducing regeneration sand acid consumption value
  • Waste sand regeneration method reducing regeneration sand acid consumption value

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] The waste sand regeneration method for reducing the acid consumption value of the regenerated sand in this embodiment is carried out in the following steps:

[0032] (1) Waste sand crushing: the waste sand is crushed into fine sand, which is convenient for entering the roasting furnace; the fine sand mesh number is 10-20 mesh;

[0033] (2) Roasting: Put the fine sand in a roasting furnace, first roast it at 340°C for 60 minutes to remove the inert film on the surface of the inorganic coated sand, and then roast it at 650°C for 60 minutes to completely burn out the organic matter in the waste sand;

[0034] (3) Wet mixing and regeneration: The fine sand after step (2) is stirred in a wet mixing tank containing a dilute acid solution for 30 minutes. On the one hand, it cools the sand and reduces the alkalinity in the sand. Material neutralization treatment; then the mixture of fine sand and dilute acid solution enters the sand-water separator for sand-water separation, the separ...

Embodiment 2

[0039] The waste sand regeneration method for reducing the acid consumption value of the regenerated sand in this embodiment is carried out in the following steps:

[0040] (1) Waste sand crushing: the waste sand is crushed into fine sand, which is convenient for entering the roasting furnace; the fine sand mesh number is 10-20 mesh;

[0041] (2) Roasting: Place the fine sand in a roasting furnace, first roast at 360°C for 50 minutes to remove the inert film on the surface of the inorganic coated sand, and then roast at 640°C for 60 minutes to completely burn out the organic matter in the waste sand;

[0042] (3) Wet mixing and regeneration: The fine sand after step (2) is stirred in a wet mixing tank containing a dilute acid solution. The mixing time is 25 minutes. On the one hand, the temperature of the sand is cooled, and the alkalinity in the sand is reduced. Material neutralization treatment; then the mixture of fine sand and dilute acid solution enters the sand-water separator ...

Embodiment 3

[0047] The waste sand regeneration method for reducing the acid consumption value of the regenerated sand in this embodiment is carried out in the following steps:

[0048] (1) Waste sand crushing: the waste sand is crushed into fine sand, which is convenient for entering the roasting furnace; the fine sand mesh number is 10-20 mesh;

[0049] (2) Roasting: Place the fine sand in a roasting furnace, first roast at 350°C for 70 minutes to remove the inert film on the surface of the inorganic coated sand, and then roast at 660°C for 70 minutes to completely burn out the organic matter in the waste sand;

[0050] (3) Wet mixing and regeneration: The fine sand after step (2) is stirred in a wet mixing tank containing a dilute acid solution for 30 minutes. On the one hand, it cools the sand and reduces the alkalinity in the sand. Material neutralization treatment; then the mixture of fine sand and dilute acid solution enters the sand-water separator for sand-water separation, the separated...

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Abstract

The invention particularly relates to a waste sand regeneration method reducing regeneration sand acid consumption value, and belongs to the field of environmental protection. The purpose is to provide the waste sand regeneration method capable of being simple and convenient in operation, low in cost, and effectively reducing the regeneration sand acid consumption value. The waste sand regeneration method by reducing the regeneration sand acid consumption value comprises the following steps of crushing the waste sand; roasting; carrying out wet-process stirring regeneration; grinding; and winnowing magnetic separation.According to the waste sand regeneration method by reducing the regeneration sand acid consumption value, the problems that the regeneration sand acid consumption value is unstable and high are solved, the regeneration rate is high, the quality of the regeneration sand is good, and the cost of the regeneration sand is low; and meanwhile, the regeneration sand is energy-saving and environment-friendly in the regeneration process, good economic benefits are achieved, and considerable economic benefits can be brought to the casting enterprises.

Description

Technical field [0001] The invention belongs to the field of environmental protection regeneration, and particularly relates to a waste sand regeneration method that reduces the acid consumption value of the regenerated sand. Background technique [0002] As the concept of green casting has taken root in the hearts of the people, foundries are facing tremendous environmental pressures. Among them, the amount of waste sand produced by foundries is large, covering a large area, and difficult to handle. At present, foundries basically use waste sand recycling equipment to recycle waste sand. However, due to the uneven equipment at this stage, there are big problems in the quality and stability of recycled sand. The stability of the quality of reclaimed sand is mainly reflected in the instability of the acid consumption value, which is often too high. [0003] Generally, the waste sand produced in the casting production process of the foundry is mainly clay sand and core waste sand. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/04B22C5/00B22C5/06B22C5/08
CPCB22C5/0409B22C5/00B22C5/06B22C5/08
Inventor 冯俊龙秦申二尹海军李卓情胡胜利
Owner HEFEI RENCHUANG CASTING MATERIAL CO LTD
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