CN102078915A

CN102078915A - Used water glass sand regeneration method

Info

Publication number: CN102078915A
Application number: CN200910310570XA
Authority: CN
Inventors: 孙金全
Original assignee: TIANJIN AUKANG BUILDING DECORATION ENGINEERING Co Ltd
Current assignee: TIANJIN AUKANG BUILDING DECORATION ENGINEERING Co Ltd
Priority date: 2009-11-27
Filing date: 2009-11-27
Publication date: 2011-06-01

Abstract

The invention discloses a used water glass sand regeneration method which mainly comprises the steps of: (1) adding wastewater to used water glass sand for pulverization, separating the used sand by using a crusher, and recovering with a dry process; (2) in the dry-process recovering process, removing sodium oxide in the used sand, and simultaneously separating out dust and sinter in the used sand together; (3) in a wet-process regeneration process, washing the used sand recovered with the dry process with water, scrubbing and removing the sodium oxide again; and (4), dehydrating the regenerated water glass sand, drying, cooling, modeling facing sand, and delivering to a sand warehouse for storage for later use. In the invention, the technologies of dry-processing recovering, wet-process regeneration and facing sand modeling are comprehensively utilized to regenerate the used water glass sand and collect and comprehensively utilize sludge generated after precipitation and wastes generated from other regenerated sands, thereby the purposes of saving energy, reducing energy consumption, lightening pollution, reducing cost, improving quality and realizing green casting are achieved.

Description

Method for regenerating water-glass old sand

Affiliated technical field:

The present invention relates to a kind of metal casting material regeneration method, especially a kind of method for regenerating water-glass old sand is suitable for the regenerating water-glass old sand recovery technology.

Technical background:

At present, water-glass sand CO? it is simple that sclerosis moulding production steel-casting has technology, and cost is low, and is nontoxic, tasteless, the advantage that the source is abundant, but regenerating used difficulty, the broken difficulty of collapsibility difference, general renovation process poor effect, wet reclamation sewage, Treatment of Sludge is more difficult, so a large amount of old sand is as producing garbage emission.Along with to environmental protection, resource, the control of the energy are subsisted big increasingly the time, and freight charges are constantly soaring, and the price of fresh sand is also on the rise.Old sand no longer is an industrial refuse, and particularly the regenerating water-glass old sand problem is paid much attention to by numerous founders author.Various regenerating used technology, dry reclamation constantly appears in equipment, wet reclamation, chemical regeneration, combining and regenerating etc., but the regeneration of reasonable water-glass sand is not widely used.

The form of old sand dry reclamation is varied, and mechanical type is arranged, air-flowing type, and oscillatory type, but see all it is " collision friction " process with regard to regeneration mechanism.When the active force that produces in the collision friction during greater than the bond strength of the yield strength of the residual adhesive film on the old sand grain or former sand grains and residual adhesive film, residual adhesive film on the old sand grain is destroyed and break away from former sand grains, residual adhesive film is removed from sand after wind is washed, and the number of times of collision friction is many more, intensity is big more, residual adhesive film is removed totally more, and the effect of dry reclamation is good more.But excessive collision friction active force and too much collision friction effect number of times closely can not increase the wearing and tearing of element of installation, also can aggravate the fragmentation of sand grains self.Therefore, the active force of collision friction and effect number of times are not the best approaches that improves the dry reclamation effect in the raising dry reclamation.Dry reclamation also exists the membrane removal rate of used sodium silicate sand low simultaneously, and reclaimed sodium silicate sand is of poor quality, the defective that the old sand collapsibility significantly descends.

Wet reclamation is meant the residual adhesive film that utilizes on the water-soluble characteristics removal old sand grain of the lip-deep residue of glass old sand grain (residual water glass binder, salt, acid etc.).Wet reclamation used sodium silicate sand quality height, the membrane removal rate can be greater than 90%, rate of recovery height; But its regeneration technology and device systems are complicated, and the sewage of wet reclamation needs circulating and recovering or harmless emission after treatment.

The chemical regeneration of old sand, typically refer to and in old sand, add some chemical reagent or solvent, even old sand and chemical reagent or stirring solvent, remove the residual binding agent and the harmful components thereof on old sand surface by chemical reaction, old sand is recovered or near the physical and chemical performance of fresh sand.The quality of waterglass chemical regeneration sand is good, can replace fresh sand to use, and the nitrogen production cost is higher, and actual production is used less.

Summary of the invention

In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of method for regenerating water-glass old sand, dry method is reclaimed, wet reclamation, face floor sand Modeling Technology combines; Make the old sand repeated regeneration, use repeatedly, old sand makes full use of and the effect of environmental protection to reach.

The technical solution used in the present invention is:

1, used sodium silicate sand is added the waste water efflorescence, utilize disintegrating machine that old sand is separated, implement dry method and reclaim;

2, in the dry method removal process, remove the sodium oxide molybdena in the old sand, the dust in the while old sand, sinter also is separated in the lump;

3, in the wet reclamation process, the old sand that dry method is reclaimed passes through washing, removes sodium oxide molybdena after the scouring once more;

4, the water-glass sand to regeneration dewaters, oven dry, and cooling, the moulding of face floor sand sends to sand storage and stores stand-by.

Technological process is as follows:

Used sodium silicate sand adds waste water efflorescence → dry method recovery → wet reclamation → dehydration → oven dry → cooling → face floor sand moulding → send to sand storage.

The invention has the beneficial effects as follows that comprehensive utilization, dry method reclaim, wet reclamation and face floor sand Modeling Technology are effectively removed the sodium oxide molybdena more than 95% in the used sodium silicate sand; Floor sand uses the reclaimed sand preparation simultaneously, can save 1/3rd fresh sand.The waste water major part that produces in the regenerating water-glass old sand process joins in the dry antiquated sand, and antiquated sand intensity is descended, and helps a large amount of alkali of regenerating used sucking-off simultaneously, discharges in broken screening process; All the other waste water add acid and continue on for wet reclamation or distill through post precipitation, and the waterglass that distills out can be sold as the waterglass raw materials for production, can fully utilize after the waste gathering that the mud that post precipitation produces and other reclaimed sands produce; To reach energy savings, energy-saving and cost-reducing, reduce and pollute, reduce cost, improve the quality, realize the purpose of green casting.

The specific embodiment

Technological process is as follows:

Used sodium silicate sand is added the waste water efflorescence, utilize disintegrating machine that old sand is separated, implement dry method and reclaim; In the dry method removal process, remove the sodium oxide molybdena in the old sand, the dust in the while old sand, sinter also is separated in the lump; In the wet reclamation process, the old sand that dry method is reclaimed passes through washing, removes sodium oxide molybdena after the scouring once more; Water-glass sand to regeneration dewaters, oven dry, and cooling, the moulding of face floor sand sends to sand storage and stores stand-by.

Claims

1. method for regenerating water-glass old sand is characterized in that:

(1) used sodium silicate sand is added the waste water efflorescence, utilize disintegrating machine that old sand is separated, implement dry method and reclaim;

(2) in the dry method removal process, remove the sodium oxide molybdena in the old sand, the dust in the while old sand, sinter also is separated in the lump;

(3) in the wet reclamation process, the old sand that dry method is reclaimed passes through washing, removes sodium oxide molybdena after the scouring once more;

(4) water-glass sand to regeneration dewaters, oven dry, and cooling, the moulding of face floor sand sends to sand storage and stores stand-by.

Technological process is as follows:

2. method for regenerating water-glass old sand according to claim 1 is characterized in that: the disintegrating machine that uses in the dry method removal process adopts equipment to be the vibrations disintegrating machine.

3. method for regenerating water-glass old sand according to claim 1 is characterized in that: face floor sand formative technology is that the face floor sand separates in sand and the modeling process with joining, and facing sand is prepared with fresh sand, and quantitatively uses, and floor sand is prepared with reclaimed sand.