CN104593773A - Material cleaning device and material cleaning method - Google Patents

Abstract

The present application discloses a material cleaning device, comprising: a container; a material containing part arranged in the container, the material containing part includes a first baffle and a second baffle; the first baffle and The included angle between the horizontal directions is an acute angle, the bottom edge of the first baffle plate is connected to the bottom edge of the second baffle plate, and the connecting portion of the first baffle plate and the second baffle plate is set on the bottom of the container. The material cleaning device can reduce material loss, enhance cleaning effect and save production cost. The application also discloses a material cleaning method. Using the above-mentioned material cleaning device to clean materials can not only reduce material loss and save production costs, but also can clean impurities embedded in the edge leather, and the cleaning effect is better.

Description

A material cleaning device and material cleaning method

technical field

The invention relates to the technical field of solar cell manufacturing, in particular to a material cleaning device and a material cleaning method.

Background technique

In the production process of solar-grade crystalline silicon, in order to reduce production costs, silicon materials such as trim and head and tail materials need to be melted and fed again, and these silicon materials contain impurities that need to be removed. When cleaning the edge leather, the edge leather is piled up in the cleaning device in a disorderly manner. The surface of the crucible with more impurities may be covered by other edge leather, so it cannot be exposed to the corrosive liquid, resulting in impurities on the crucible surface. Effective removal, but some parts that do not need to be corroded are corroded due to exposure to the corrosive liquid, resulting in loss of materials and resulting in waste of production.

In addition, the current cleaning method for the edge leather is: sandblast and polish the edge leather first, then soak the edge leather in a mixed acid solution with a ratio of HF and HNO ₃ of 1:11, corrode for 15 to 25 seconds, and Remove metal impurities from the surface. However, the above method cannot remove the impurities embedded in the edge leather, and the impurity removal ability is far from enough.

The above two reasons will lead to a large material loss during the polycrystalline ingot casting process, and there are too many impurities in the silicon ingot, which is easy to form a shadow at the bottom, or the impurity layer at the bottom is too high, which reduces the crystallization rate and quality of the silicon ingot. Increased production costs.

Contents of the invention

In order to solve the above problems, the present invention provides a material cleaning device and a material cleaning method, which can effectively remove the crucible surface and impurities embedded in the edge leather, improve the crystallization rate of silicon ingots and the quality of silicon ingots, and reduce production costs .

A material cleaning device provided by the invention comprises:

container;

A material containing part arranged in the container, the material containing part includes a first baffle and a second baffle;

The angle between the first baffle and the horizontal direction is an acute angle, the bottom of the first baffle is connected to the bottom of the second baffle, and the first baffle and the second The connecting part of the two baffles is arranged on the bottom surface of the container.

Preferably, in the above-mentioned material cleaning device, the angle between the first baffle plate and the horizontal direction is 30° to 75°, inclusive.

Preferably, in the above material cleaning device, the angle between the second baffle and the first baffle is 90°.

Preferably, in the above material cleaning device, the second baffle is porous.

Preferably, in the above-mentioned material cleaning device, a plurality of said material containing parts distributed in parallel are included, and gaps are provided between adjacent said material containing parts.

Preferably, in the above-mentioned material cleaning device, the material of the material holding part is polypropylene or polytetrafluoroethylene.

A material cleaning method provided by the present invention includes: using any one of the above-mentioned material cleaning devices to clean the material.

Preferably, in the above material cleaning method, the material is cleaned with reverse proportional acid, wherein the reverse proportional acid includes hydrofluoric acid and nitric acid, and the proportion of the hydrofluoric acid is greater than that of the nitric acid.

Preferably, in the above material cleaning method, the ratio of the hydrofluoric acid to the nitric acid ranges from 3:1 to 8:1.

It can be seen from the above description that a material cleaning device provided by the present invention includes a material holding part arranged in the container, and the material holding part includes a first baffle and a second baffle; the first baffle The included angle with the horizontal direction is an acute angle, the bottom edge of the first baffle plate is connected to the bottom edge of the second baffle plate, and the connecting portion of the first baffle plate and the second baffle plate placed on the bottom of the container. In this way, the edge material can be placed in the material containing part, so that the non-crucible surface is in contact with the first baffle plate without being corroded, and the crucible surface is completely exposed to the corrosive liquid to be corroded, reducing the Material loss, a material cleaning method provided by the present invention utilizes the above-mentioned material cleaning device, so the production cost can be reduced. In addition, the method uses a reverse-proportional acid with strong polarity, which can effectively remove impurities embedded in the edge leather. Therefore, the crystallization rate of the silicon ingot and the quality of the silicon ingot can be improved, and the production cost can be reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a cross-sectional view of a material cleaning device provided in an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

A material cleaning device provided in an embodiment of the present application is shown in FIG. 1 , and FIG. 1 is a cross-sectional view of a material cleaning device provided in an embodiment of the present application. The unit includes:

container1;

A material containing part arranged in the container, the material containing part includes a first baffle 2 and a second baffle 3;

The angle A between the first baffle plate 2 and the horizontal direction is an acute angle, the bottom edge of the first baffle plate 2 is connected to the bottom edge of the second baffle plate 3, and the first baffle plate 2 and the connecting portion of the second baffle 3 are arranged on the bottom surface of the container.

From the above description, it can be known that using the material cleaning device provided in the embodiment of the present application, the edge material can be placed on the upper surface of the first baffle 2 in the material containing part, and the second baffle 3 can be used to prevent the edge Material slipping. When placing the edge material, make its non-crucible surface contact with the first baffle plate 2, after putting the corrosive liquid into the container 1, the non-crucible surface of the edge material will not be corroded, and the crucible surface will be completely exposed to corrosion. Corrosion in the liquid, which reduces material loss and saves production costs.

In the above-mentioned material cleaning device, the angle A between the first baffle plate 2 and the horizontal direction may preferably be 30° to 75°, inclusive. If the included angle A is set too small, the space occupied by the material holding parts in the horizontal direction is too large, resulting in a small number of material holding parts set in the container 1, and if the included angle A is set too large , the edge leather is not easy to rest on the surface of the material holding part, resulting in difficulties in placement. Therefore, the included angle A can be preferably set to 30° to 75°, which can ensure that the material cleaning device has More material storage parts can improve the cleaning and processing capacity of materials, and make the placement of edge leather easier.

In the above material cleaning device, the angle B between the second baffle 3 and the first baffle 2 may preferably be 90°. The function of the second baffle plate 3 is to prevent the edge material on the upper surface of the first baffle plate 2 from sliding down. If the included angle B is set to a smaller acute angle, it is possible that the second baffle plate 3 and the edge skin The crucible surface of the material is in contact with each other, so that the contact surface is isolated from the corrosive liquid, so that the impurities at the contact surface cannot be cleaned, and the cleaning effect is greatly reduced. If the included angle B is set to a relatively large obtuse angle, then The effect of preventing the edge leather from slipping is not strong. Therefore, setting the included angle B to 90° can not only enhance the effect of preventing the edge leather from slipping, but also improve the cleaning effect.

In the above material cleaning device, the second baffle plate 3 may preferably be porous. Due to the various shapes of the trim, in some cases, after the trim is placed, the crucible surface of the trim may come into contact with the second baffle plate 3, so that the Impurities are not easy to remove, which reduces the cleaning effect. In this scheme, after the second baffle 3 is set in a porous shape, the shading can be reduced. The area is in contact with the etchant through the holes so that it can also be cleaned, thereby improving the cleaning effect. It should be noted that the hole of the second baffle plate 3 can be a round hole, a square hole or any other shape, as long as the size of the hole can ensure the penetration of the corrosive liquid and effectively corrode the crucible surface of the edge material.

In the above-mentioned material cleaning device, it may preferably include a plurality of said material containing parts distributed in parallel, and gaps are provided between adjacent said material containing parts. One embodiment is: the length of the first baffle plate 2 is set to 157mm, the length of the second baffle plate 3 is set to 30mm, the angle A is set to 45°, the angle B is set to 90°, and the adjacent materials are filled The lateral distance between the placed parts is set to 50mm. Set up as many material holding parts as possible, so that as much edge leather can be accommodated in it, and more edge leather can be cleaned at one time to improve work efficiency. In addition, adjacent material holding parts There is a gap between them, so as to ensure that the edge leather can be conveniently placed in each material holding part, and it can better ensure that the crucible surface of each edge leather can be in contact with the corrosive liquid, and the cleaning effect is enhanced. Effect.

In the above-mentioned material cleaning device, the material of the material containing part may preferably be polypropylene or polytetrafluoroethylene. Both polypropylene and PTFE are resistant to chemical acid corrosion, and their mechanical strength is high enough. Using these two materials to make material holding parts can make their working life longer, thereby reducing production costs.

It can be seen from the above description that using the material cleaning device provided in the embodiment of the present application can reduce material loss, enhance cleaning effect, and save production cost.

The embodiment of the present application also provides a material cleaning method, the method includes using any one of the above-mentioned material cleaning devices to clean the material. Since the above-mentioned material cleaning device is used to clean the material, the material loss can be reduced and the production cost can be saved.

In the above material cleaning method, the material may preferably be cleaned with reverse proportion acid, wherein the reverse proportion acid includes hydrofluoric acid and nitric acid, and the proportion of the hydrofluoric acid is greater than the proportion of the nitric acid. Since hydrofluoric acid is a polar acid and nitric acid is a non-polar acid, when the proportion of hydrofluoric acid is greater than that of nitric acid, the mixed acid can selectively corrode the impurities in the edge leather, thereby removing the impurities embedded in the edge. Impurities inside the leather. Further, in the material cleaning method, the ratio of the hydrofluoric acid to the nitric acid can preferably range from 3:1 to 8:1, and this ratio is the best ratio obtained through practice, which can make the cleaning effect better.

Utilizing the above-mentioned material cleaning method provided in the embodiment of the present application can not only reduce material loss and save production cost, but also can clean impurities embedded in the edge leather, and the cleaning effect is better.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. a material washing unit, is characterized in that, comprising:

Container;

The material be arranged in described container holds parts, and described material holds parts and comprises the first baffle plate and second baffle;

Angle between described first baffle plate and horizontal direction is acute angle, and the base of described first baffle plate is connected with the base of described second baffle, and the connection section of described first baffle plate and described second baffle is arranged on the bottom surface of described container.

2. material washing unit according to claim 1, is characterized in that, the angle between described first baffle plate and horizontal direction be 30 ° to 75 °, comprise endpoint value.

3. material washing unit according to claim 1, is characterized in that, the angle between described second baffle and described first baffle plate is 90 °.

4. material washing unit according to claim 1, is characterized in that, described second baffle is vesicular.

5. the material washing unit according to any one of claim 1-4, is characterized in that, the described material comprising multiple parallel distribution holds parts, and adjacent described material holds between parts and is provided with space.

6. material washing unit according to claim 5, is characterized in that, the material that described material holds parts is polypropylene or tetrafluoroethylene.

7. a material purging method, is characterized in that, utilizes the material washing unit as described in any one of claim 1-6 to carry out the cleaning of material.

8. material purging method according to claim 7, is characterized in that, utilize reverse proportionality acid to clean material, wherein, described reverse proportionality acid comprises hydrofluoric acid and nitric acid, and the ratio of described hydrofluoric acid is greater than the ratio of described nitric acid.

9. material purging method according to claim 8, is characterized in that, the proportional range of described hydrofluoric acid and described nitric acid is 3:1 to 8:1.