CN211638219U

CN211638219U - Tectorial membrane sand hot rubbing regeneration system

Info

Publication number: CN211638219U
Application number: CN201921756180.0U
Authority: CN
Inventors: 赵伟时; 陈国兴; 吴学庆
Original assignee: Guizhou Metallurgy Science Research Department; Guiyang Baiyun Alloy Casting Plant
Current assignee: Guizhou Metallurgy Science Research Department; Guiyang Baiyun Alloy Casting Plant
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-10-09
Anticipated expiration: 2029-10-18

Abstract

The utility model discloses a tectorial membrane sand heat is rubbed with hands regeneration system has promoted heat utilization efficiency, and is energy-concerving and environment-protective, simultaneously, through between sand and the sand, the rubbing with hands between sand and the equipment has accelerated peeling off and burning of sand surface carbon layer, and regeneration efficiency is higher, therefore equipment drops into fewly, and occupation of land is little, and the waste gas volume is few, and is friendly to the environment, can realize the recovery of miniaturized tectorial membrane sand, is particularly suitable for middle-size and small-size casting enterprise to use.

Description

Tectorial membrane sand hot rubbing regeneration system

Technical Field

The utility model relates to a steel casting field, in particular to tectorial membrane sand hot rubbing regeneration system.

Background

The reclaimed sand is silica sand, precious pearl sand, ceramic sand and the like which are used in the casting industry and processed to have service performance and value again, and can be recycled as the basic material of precoated sand or other sand products. China is a world-wide casting country, and the resource consumption and the environmental pollution caused by directly abandoning waste sand are extremely remarkable. Therefore, the regeneration of the waste sand is a main way for solving the problem, and has great practical significance for realizing green sustainable development of the casting industry in China.

The regeneration of used sand starts in 1912, and has been already over 90 years of history so far, and dry regeneration, wet regeneration and thermal regeneration processes are developed successively.

1. Dry regeneration

Dry regeneration is further classified into centrifugal, air-flow, vibration, rubbing, and the like. Centrifugal and airflow type regeneration is to accelerate used sand grains to a certain speed by using mechanical centrifugal force and high-pressure air flow, and to regenerate the used sand by means of the friction between sand grains and metal components or between sand grains. The vibration type regeneration is that under the action of vibration force, the machine body filled with the old sand blocks continuously vibrates, so that impact and friction among the sand blocks and impact and friction between the sand blocks and the inner wall of the vibrating body are caused, the sand blocks are broken, and the old sand grains are regenerated. The rubbing regeneration is to regenerate used sand by strong friction between sand grains and members.

The main advantages of dry regeneration are: the device has simple structure, less investment, quick effect, easy realization and no secondary pollution. Its main disadvantages are: the residual binder film on the old sand particles can not be completely removed, the quality of the regenerated sand is not too high, the equipment components are worn, the sand particles are broken, and the like. And the higher the stripping rate of used sand grains (i.e. the better the quality of reclaimed sand), the greater the impact force and friction required, the more severe the grinding of equipment components and the crushing of sand grains.

2. Wet regeneration

The wet regeneration is to utilize the dissolving and scrubbing action of water and the mechanical stirring action, and is to crack, dissolve, fall off or remove the residual binder film in the used sand.

The main advantages of wet regeneration are: the sand has good regeneration effect on the used sand of some water-soluble binders, the quality of the regenerated sand is good, the sand can be used as facing sand, and the regeneration efficiency of the used sand is high. Its main disadvantages are: the energy consumption is great, and area is great, and has sewage treatment scheduling problem. The combination of wet regeneration and wet cleaning has good comprehensive effect, and the latest research shows that the ester hardened sodium silicate old sand is very suitable for wet regeneration, while the resin sand has poor effect.

3. Thermal regeneration

The thermal regeneration is a regeneration method which takes natural gas, coal gas, diesel oil, coal oil and the like as fuels and heats old sand to the temperature of 650-900 ℃ through a roasting furnace so as to remove combustible resin residues on the old sand. The thermal regeneration method has the advantages of good regeneration effect on the organic binder sand, cleaner removal of residual binder, good thermal stability of the regenerated sand, restoration of original particle size distribution, high equipment investment, high cost and high energy consumption. At present, a boiling combustion method and a rotary kiln method are mainly used.

Generally, the existing regeneration method has the problems of large investment of recovery equipment, high fuel consumption, large amount of waste gas, expensive equipment investment and large occupied area.

Disclosure of Invention

In view of this, the utility model aims at providing a tectorial membrane sand heat is rubbed with hands regeneration system with hands can overcome the recovery plant and drop into greatly, and fuel consumption is high, and the waste gas volume is big, and equipment drops into with great value, the big problem of area.

The utility model aims at realizing through the following technical scheme:

the precoated sand hot rubbing regeneration system comprises a crusher, a lifter I, a stock bin I, a classifying screen I, a magnetic separator, a lifter II, a stock bin II, a calcining furnace, a hot rubbing reactor, a cooler and a classifying screen II which are sequentially arranged;

the waste sand is crushed by a crusher and then sent into a bin I by a lifter I, and then is subjected to screening by a grading sieve I and magnetic separation by a magnetic separator to remove iron, then the sand is sent into a bin II by the lifter II, a discharge hole of the bin II is connected with a feed hole of a calciner, a feed hole of a hot rubbing reactor is connected with a discharge hole of the calciner, the sand is heated and calcined by the calciner to complete carbonization of the sand, the carbonized sand is sent into the hot rubbing reactor by a control valve, carbon on the surface of the sand is stripped and oxidized by the hot rubbing reactor, and then the hot sand is sent into a cooler to be cooled.

Particularly, the system also comprises a hoisting machine III, a hoisting machine IV, an elevated coarse sand bin and an elevated fine sand bin; after the cooled reclaimed sand is classified by a classifying screen II, coarse sand and fine sand are respectively conveyed into a high-position coarse sand bin and a high-position fine sand bin for storage through a hoister III and a hoister IV;

particularly, the calcining furnace comprises a feeding hole for feeding materials, the feeding hole is communicated with a hearth, the hearth is heated through electric furnace wires and the temperature in the furnace is controlled, and a heat-insulating layer is arranged outside the hearth;

particularly, the hot scrubbing reactor comprises a reactor body, a starting motor and a gearbox, wherein a sand inlet is formed in the top of the reactor body, a stirrer is arranged inside the reactor body, a rotating shaft of the stirrer is connected with the gearbox, the gearbox is connected with the starting motor, and the starting motor and the gearbox are used for driving the stirrer to stir carbonized hot sand;

particularly, baffles are arranged on the inner wall of the reactor body;

in particular, the upper part of the reactor body is also provided with a vent valve for inputting compressed air from the outside.

The utility model has the advantages that:

through the utility model, because the closed electric heating calcining furnace is adopted to carbonize the precoated sand, the resin is carbonized at the high temperature of 700-800 ℃, and only a small amount of gas generated by decomposing and burning the resin is generated; when the hot sand is sent into the hot scrubbing reactor for treatment, only a small amount of oxygen is needed to combust carbon on the surface of the sand, so that the heat utilization efficiency is improved, the cost is reduced, and the energy-saving and environment-friendly effects are achieved; meanwhile, the stripping and burning of the carbon layer on the surface of the sand are accelerated by rubbing between the sand and between the sand and the equipment, the regeneration efficiency is higher, so that the equipment investment is low, the occupied area is small, the waste gas amount is small, the environment is friendly, the recovery of the small-sized precoated sand can be realized, and the method is particularly suitable for small and medium-sized casting enterprises.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of the system connection of the present invention;

fig. 2 is a schematic structural diagram of a calcining furnace and a hot rubbing reactor.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention.

As shown in fig. 1, the precoated sand hot scrubbing regeneration system of the present invention comprises a crusher 1, a lifter I2, a bin I3, a classifying screen I4, a magnetic separator 5, a lifter II6, a bin II7, a calciner 8, a hot scrubbing reactor 9, a cooler 10, and a classifying screen II11, which are sequentially arranged;

the waste sand is crushed by a crusher 1, then is sent into a bin I3 through a lifter I, is sieved by a grading sieve I4 and is magnetically separated by a magnetic separator 5 to remove iron, then is sent into a bin II7 through a lifter II, a discharge hole of the bin II is connected with a feed hole of a calcining furnace, a feed hole of a hot rubbing reactor 9 is connected with a discharge hole of the calcining furnace, the sand is heated and calcined by the calcining furnace to complete carbonization of the sand, the carbonized sand is sent into the hot rubbing reactor 9 through a control valve 20, carbon on the surface of the sand is stripped and oxidized through the hot rubbing reactor 9, and then the hot sand is sent into a cooler 10 to be cooled.

As a further improvement, the system also comprises a lifting machine III12, a lifting machine IV14, an upper coarse sand silo 13 and an upper fine sand silo 15; after the cooled reclaimed sand is classified by a classifying screen II11, coarse sand and fine sand are respectively conveyed into a high-position coarse sand silo 13 and a high-position fine sand silo 15 for storage through a lifter III and a lifter IV. The classified storage is carried out after the screening, and the use is convenient.

As shown in figure 2, the calcining furnace comprises a feeding hole for feeding materials, the feeding hole is communicated with a hearth, the temperature in the furnace is heated and controlled through an electric furnace wire 18, a heat-insulating brick is arranged outside the hearth, and heat-insulating cotton is laid outside the heat-insulating brick. In practical application, the hearth can be made of heat-resistant stainless steel or refractory materials, the temperature in the furnace is heated and controlled through the electric furnace wire 18, the calcining temperature and time are controlled according to the change of different quartz sand, precious pearl sand, ceramic sand and coating components of the burnt sand,

the hot scrubbing reactor comprises a reactor body, a starting motor 26 and a gearbox 25, a sand inlet is formed in the top of the reactor body, a stirrer 23 is arranged inside the reactor body, a rotating shaft of the stirrer is connected with the gearbox, the gearbox is connected with the starting motor, and the starting motor and the gearbox are used for driving the stirrer to stir carbonized hot sand.

The inner wall of the reactor body is provided with a baffle 22, and rotating sand grains collide with the baffle when the precoated sand is stirred, so that circulation generated by the precoated sand is prevented, and the rubbing effect of the precoated sand in the reactor is enhanced. The upper part of the reactor body is also provided with a vent valve 24 for inputting compressed air from the outside. By means of the baffles, the friction and collision between the sand and the wall of the chamber can be fully agitated, and at the same time, compressed air is introduced from the valve 24 to supplement oxygen required for carbon combustion.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. Tectorial membrane sand hot rubbing regeneration system, its characterized in that: the system comprises a crusher (1), a lifter I (2), a bin I (3), a classifying screen I (4), a magnetic separator (5), a lifter II (6), a bin II (7), a calcining furnace (8), a hot rubbing reactor (9), a cooler (10) and a classifying screen II (11) which are arranged in sequence;

the method comprises the steps of crushing waste sand by a crusher (1), feeding the crushed waste sand into a bin I (3) by a lifter I, screening by a grading screen I (4), magnetically separating by a magnetic separator (5) to remove iron, feeding the sand into a bin II (7) by a lifter II, connecting a discharge hole of the bin II with a feed hole of a calcining furnace, connecting a feed hole of a hot rubbing reactor (9) with a discharge hole of the calcining furnace, heating and calcining the sand by the calcining furnace to complete carbonization of the sand, feeding the carbonized sand into the hot rubbing reactor (9) through a control valve (20), stripping and oxidizing carbon on the surface of the sand by the hot rubbing reactor (9), and feeding the hot sand into a cooler (10) for cooling.

2. The precoated sand hot rubbing regeneration system according to claim 1, characterized in that: the system also comprises a hoisting machine III (12), a hoisting machine IV (14), a high-position coarse sand silo (13) and a high-position fine sand silo (15); after the cooled reclaimed sand is classified by a classifying screen II (11), coarse sand and fine sand are respectively conveyed into a high-position coarse sand storage bin (13) and a high-position fine sand storage bin (15) for storage through a lifter III and a lifter IV.

3. The precoated sand hot rubbing regeneration system according to claim 1, characterized in that: the calcining furnace comprises a feeding hole for feeding materials, the feeding hole is communicated with a hearth, the hearth is heated through an electric furnace wire (18) and the temperature in the furnace is controlled, and a heat-insulating layer is arranged outside the hearth.

4. The precoated sand hot rubbing regeneration system according to claim 1, characterized in that: the hot scrubbing reactor comprises a reactor body, a starting motor (26) and a gearbox (25), wherein a sand inlet is formed in the top of the reactor body, a stirrer (23) is arranged inside the reactor body, a rotating shaft of the stirrer is connected with the gearbox, the gearbox is connected with the starting motor, and the starting motor and the gearbox are used for driving the stirrer to stir carbonized hot sand.

5. The precoated sand hot rubbing regeneration system according to claim 4, characterized in that: the inner wall of the reactor body is provided with a baffle (22).

6. The precoated sand hot rubbing regeneration system according to claim 4, characterized in that: the upper part of the reactor body is also provided with a ventilation valve for inputting compressed air from the outside.