WO2018103708A1 - Induction furnace lining forming structure and method for silicon residue smelting - Google Patents

Abstract

An induction furnace lining forming structure for silicon residue smelting, comprising an induction furnace (1), having a cavity provided with a coil (2). A coil plaster layer (3) and a coaxially arranged inner mold body (4) are provided in an inner side of the coil (2). A lining layer (5) is filled in the cavity between the inner mold body (4) and the coil plaster layer (3). The inner mold body (4) is welded into an integral structure by means of steel plates. A heating device (6) is further provided at the inner side of the inner mold body (4).

Description

Induction furnace liner lining forming structure and method for silicon smelting Technical field

The invention relates to the field of recycling of silicon slag, in particular to an induction furnace lining forming structure and method for silicon smelting.

Background technique

Silicon slag generally refers to the remainder of the ore after refining, and also contains a certain amount of silicon. There are many kinds of silicon slag, industrial silicon slag, solar silicon slag, semiconductor silicon slag and so on. Silicon slag can be used to re-crystallize, purify, and now silicon is scarce, and the price is high. Silico-manganese slag, also called silico-manganese smelting slag, is an industrial waste slag emitted when smelting silicon-manganese alloy. Its structure is loose, and its appearance is often light green particles, which are composed of some irregular amorphous amorphous particles. The silico-manganese slag is brittle and brittle, and the bulk silicon-manganese slag can be broken into small pieces by the crusher, and then the coarsely crushed material is further pulverized by entering the fine crusher to ensure that the material entering the silo can reach the monomer dissociation. The degree is then evenly sorted by a vibrating feeder and a belt conveyor to the trapezoidal jig. The main purpose of the crushing is to break the structure of the continuous body. The main purpose of the jigging is to recover the silicon-manganese alloy from the silicon-manganese slag. There is a large difference in specific gravity between silicomanganese slag and silicomanganese alloy. The metal and waste slag can be separated by the re-selection of the jig to obtain pure alloy and waste slag. Finally, the concentrate and tail can be separated by dehydration of the dewatering sieve. The mine is dehydrated.

Most of the current silicon slag treatment relies on manual selection. Under certain pulverization conditions, the silicon block with higher purity is selected by manual selection. The advantage of this is that the cost is low, but the efficiency is very poor. Moreover, the utilization rate of silicon slag is also very low; while the trapezoidal jig is used for sorting, the selected silicon has low purity, high cost, and low utilization of silicon slag.

Based on the characteristics of the existing technology and the industrial structure, it is urgent to propose a new process and supporting equipment to re-use industrial silicon slag to change the industrial structure of the silicon industry, optimize the industrial structure allocation, and realize the industrial upgrading.

The current lining of the smelting furnace is usually formed by using a loose-leaf connecting plate to form an inner mold, and then forming an inner lining layer by filling and tamping, then removing the annular supporting member and removing the loose-leaf connecting plate one by one. The inner liner produced is relatively simple and the quality is not stable.

Summary of the invention

It is an object of the present invention to provide an induction furnace lining forming structure and method for silicon slag melting, which solves the problems of unstable quality and easy local defects in the manufacturing process of the inner lining layer in the prior art.

The invention is achieved by the following technical solutions:

An induction furnace lining forming structure for silicon smelting, comprising an induction furnace, a coil is arranged in a cavity of the induction furnace, a coil cement layer is arranged inside the coil, and an inner mold body is coaxially arranged, An inner liner is filled in the cavity between the mold body and the coil cement layer.

The inner mold body is welded by a steel plate to form an integral structure.

A heating device is also disposed inside the inner mold body.

The lining forming structure of the smelting furnace of the present invention is greatly different from the prior art: the whole structure is formed by using steel plate welding as an inner mold body, and in the prior art, the inner mold is formed by a plurality of strip-shaped plates. Cylindrical structure, or the sheet material is connected into a whole structure by loose-leaf, and then the inner side of the enclosed body is provided with a solid cylinder, or is supported by a rigid ring as a lining, and is removed one by one after filling the tamping lining material. In the process of taking the board, due to the gap between the boards, the inner lining material will be filled between the gaps, causing the inner lining to fall off when the lining is removed, resulting in local missing, generally after the board is taken, by manual After the secondary smearing, due to the artificial factors, the surface of the lining is prone to unevenness. After analyzing the above process, the applicant has made an improvement on the forming structure of the lining after repeated exploration and experiment. The inner mold body made of steel plate has a smooth surface, and the surface of the inner lining layer is smoothed by filling, and since the tamping, the inner mold steel plate and the inner lining layer are attached. Tight, not In order to solve this problem, the applicant sets a heating device inside the inner mold body, and after the completion of the filling, the heating device is used for heating, and the inner mold body made of the steel plate has a thermal expansion and contraction rate. It is much larger than the expansion ratio of the inner liner material. Therefore, the inner mold body radially presses the inner liner layer and presses the bottom portion downward, so that not only the inner liner layer is tightened in the radial direction, but after cooling, The inner mold body made of steel plate shrinks inwardly, and a gap is formed between the inner mold layer and the inner liner layer. When the gap is reasonable, the inner mold body can be easily taken out, thus avoiding the problem of missing surface of the inner liner layer and improving The uniformity of the inner lining, at the same time, due to the increased radial extrusion of the inner lining, the inner lining layer is more compact, the downward tamping and the radial pressing process provide the tightness of the inner lining layer. A strong support.

The heating device is an annular nozzle burner. Furthermore, in the comparison test of many heating devices, it is found that the annular nozzle burner is the most ideal heating device, and the combustion flame sprayed directly from the combustion flame directly burns the inner mold body, and the heating speed is fast, and the inner mold body is heated. The expansion is obvious, and the circular symmetrical structure makes the expansion of the inner mold body uniform, and the inner liner layer is stable in structure and uniform in thickness.

The inner mold body has a cylindrical structure, and the bottom thereof is closed by a curved plate to form a whole. The bottom of the inner mold body made of a curved plate can distribute the pressure of the bottom of the inner mold body to the inner lining layer on the curved surface instead of on one plane, and the gap generated at the bottom can be made by the uniformity of the inward contraction. Uniform and easy to process.

A molding method for an induction furnace lining for silicon smelting, comprising the following steps:

(a) Set the coil paste: apply the coil paste to the gap and inside of the coil, and solidify to form a coil cement layer.

(b) fixing the inner mold body such that the inner mold body is coaxially disposed with the coil;

(c) filling the inner lining material between the coil cement layer and the inner mold body, and vibrating to form an inner lining layer;

(d) after the completion of the filling of the inner liner, the heating device is activated, the inner mold body is thermally expanded, and the inner liner layer is radially extruded;

(f) the heating device stops heating, the inner mold body cools and contracts, a gap is formed between the inner mold body and the inner liner layer, and the inner mold body is taken out;

(g) The inner liner is sintered to form a unitary body.

The invention also provides a molding method for an induction furnace lining for silicon smelting. In the prior art, the damage and deformation of the plate causes the number of times of reuse of the plate to be generally only 2 to 3 times, and in the method of the present invention, Since the inner mold body made of steel plate can be continuously reused in theory, it not only improves the recycling efficiency of the inner mold body, but also reduces the use cost of the inner mold body, since the inner mold body is installed and taken out very much. Conveniently, the installation time of the inner mold is greatly shortened, the installation efficiency is improved, and the use efficiency of the induction furnace is greatly improved.

In the step (f), when the gap width generated between the inner mold body and the inner liner layer reaches 5 to 8 mm, the inner mold body is taken out. Further, through continuous analysis in the actual test process, when the gap width generated between the inner mold body and the inner liner layer is less than 5 mm, there may be local adhesion between the inner mold body and the inner liner layer, and extraction is performed at this time. The inner mold body may damage the inner liner. When it reaches 5mm, the adhesion between the inner liner and the inner mold body is substantially eliminated, and a complete inner liner layer can be formed; when the gap exceeds 8 mm, it is necessary to wait. The time is too long and the time spent is too long, which is not conducive to improving efficiency.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. An induction furnace lining forming structure for silicon slag smelting, which adopts an inner mold body made of steel plate, the surface of which is smooth, and the surface of the lining layer is smoothed by filling, because after tamping, the inner mold In order to solve this problem, the applicant applies a heating device inside the inner mold body to heat the body plate and the inner liner layer, and the heating device is heated by the heating device after the filling is completed. The inner mold body made of steel plate has a thermal expansion and contraction rate much larger than that of the inner liner material. Therefore, the inner mold body radially presses the inner liner layer and presses the bottom portion downward, so that not only The radial tamping tightens the inner lining layer. After cooling, the inner mold body made of the steel plate shrinks inwardly, and a gap is formed between the inner lining layer and the inner lining layer. When the gap is reasonable, the inner mold body can be easily taken out, thus avoiding the problem of missing surface on the inner liner layer, improving the uniformity of the inner liner, and at the same time, increasing the radial extrusion of the inner liner layer, The inner liner is more compact, the downward tamping and the radial compaction process provide strong support for the tightness of the inner liner;

2. The invention relates to an induction furnace lining forming structure for silicon smelting. The annular nozzle burner is an ideal heating device, and the combustion flame sprayed directly to the inner mold body for combustion heating, heating speed Fast, the expansion of the inner mold body is obvious, the circular symmetrical structure makes the expansion of the inner mold body uniform, and the inner liner layer is stable in structure and uniform in thickness;

3. The invention relates to a method for forming an induction furnace inner liner for silicon smelting, since the inner mold body made of steel plate can be continuously reused theoretically, thereby not only improving the reuse rate of the inner mold body, Moreover, the use cost of the inner mold body is reduced, and the installation and removal of the inner mold body is very convenient, the installation time of the inner mold is greatly shortened, the installation efficiency is improved, and the use efficiency of the induction furnace is greatly improved.

DRAWINGS

The drawings are intended to provide a further understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the invention. In the drawing:

Figure 1 is a schematic view of the structure of the present invention.

Marked and corresponding part names in the drawing:

1-Induction furnace, 2-coil, 3-coil cement layer, 4-inner mould body, 5-liner layer, 6-heating device.

detailed description

The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. As a limitation of the invention.

Example

As shown in FIG. 1 , the invention relates to an induction furnace lining forming structure and method for silicon smelting, comprising an induction furnace 1 , wherein the induction furnace 1 has a cavity structure inside, and a coil is arranged in the cavity of the induction furnace 1 . 2. A coil cement layer 3 and a coaxially disposed inner mold body 4 are disposed inside the coil 2. The inner mold body 4 is welded by a steel plate to form a unitary structure, the upper portion of which is a cylindrical structure, and the cylindrical bottom portion is curved. The plate is closed and connected to form a whole body. Generally, the surface of the inner mold body 4 is a smooth plate surface, and the welded portion is connected into a smooth structure, and an inner liner layer 5 is filled in the cavity between the inner mold body 4 and the coil cement layer 3. The inner liner 5 is gradually added and tamped in a filling manner, and a heating device 6 is further disposed inside the inner mold body 4. The heating device 6 may be an electric heater or a burner or an infrared heater. The device is intended to heat the inner mold body. The preferred heating device 6 is an annular nozzle burner.

The above structure is made according to the following process:

(a) setting the coil cement: the coil cement is applied to the gap and the inner side of the coil 2, and solidified to form the coil cement layer 3;

(b) fixing the inner mold body 4 such that the inner mold body 4 is coaxially disposed with the coil 2;

(c) filling the lining material between the coil cement layer 3 and the inner mold body 4, tamping to form the inner liner layer 5;

(d) after the filling of the inner liner 5 is completed, the heating device 6 is activated, the inner mold body 4 is thermally expanded, and the inner liner 5 is radially pressed;

(f) heating device 6 stops heating, the inner mold body 4 cools and shrinks, when the gap width between the inner mold body 4 and the inner liner layer 5 reaches 5 ~ 8mm, the inner mold body 4 is taken out;

(g) The inner liner 5 is sintered to form a unitary body.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (7)

An induction furnace lining forming structure for silicon smelting, comprising an induction furnace (1), in which a coil (2) is arranged in a cavity of the induction furnace (1), characterized in that: a coil (2) is arranged inside There is a coil cement layer (3) and a coaxially disposed inner mold body (4), and an inner liner layer (5) is filled in the cavity between the inner mold body (4) and the coil cement layer (3). The induction furnace lining forming structure for silicon slag smelting according to claim 1, wherein the inner mold body (4) is welded by a steel plate to form a unitary structure. The induction furnace lining forming structure for silicon smelting according to claim 2, characterized in that a heating device (6) is further disposed inside the inner mold body (4). The induction furnace lining forming structure for silicon smelting according to claim 3, characterized in that the heating device (6) is an annular nozzle burner. The induction furnace lining forming structure for silicon slag smelting according to any one of claims 1 to 4, characterized in that: the inner mold body (4) has a cylindrical structure, and the bottom portion thereof is used. The curved plates are closed to form a unitary body. A molding method for an induction furnace lining for silicon smelting, characterized in that the method comprises the following steps: (a) setting the coil cement: coating the coil paste on the gap and inside of the coil (2), curing to form a coil cement layer (3); (b) fixing the inner mold body (4) such that the inner mold body (4) is coaxially disposed with the coil (2); (c) filling the inner lining material between the coil cement layer (3) and the inner mold body (4), and vibrating to form an inner liner layer (5); (d) after the inner liner (5) is completed, the heating device (6) is activated, the inner mold body (4) is thermally expanded, and the inner liner layer (5) is radially extruded; (f) the heating device (6) stops heating, the inner mold body (4) cools and shrinks, a gap is formed between the inner mold body (4) and the inner liner layer (5), and the inner mold body (4) is taken out; (g) The inner liner (5) is sintered to form a whole. A method for molding an induction furnace lining for silicon smelting according to claim 6, wherein in the step (f), the inner mold body (4) and the inner lining layer (5) When the gap width generated between 5 to 8 mm is obtained, the inner mold body (4) is taken out.

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