JP2014173177A - Vapor recovery installation and method of operating vapor drier in the installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vapor recovery installation for recovering vapor from a conveyor carrying dried copper concentrate which recovers vapor generated within a conveyor and powder dust of fine copper concentrate by managing the inside of the conveyor at negative pressure without installation of an additional dedicated dust collector for the conveyor and allows prevention of leakage from a casing and settling due to moisture within the casing and a method of operating a vapor drier.SOLUTION: A vapor drier 2 is for drying copper concentrate 1 used as raw material for copper smelting and is provided with a vapor recovery installation which consists of piping 11 for vapor recovery, with one end communicating with and connected to the sealed inside of a sealed conveyor 4 for carrying copper concentrate and the other end communicating with and connected to a bag filter 6 arranged in the vapor drier, a damper 14 provided in a fan 7 attached to the vapor drier and a damper 12 provided in the inlet of the bag filter. The vapor drier 2 and the conveyor 4 are managed at negative pressure.

Description

  [Technical Field] The present invention relates to a steam recovery facility for a steam dryer for drying copper concentrate as a raw material for copper smelting from a conveyor for transporting the dried copper concentrate.

The sulfide concentrate of the raw material in copper smelting contains about 10% of water, and when the raw material is melted in a smelting furnace, the content of the water contained in the concentrate drying equipment such as a steam dryer is 1%. It is as follows.
FIG. 1 shows a flow chart of a conventional concentrate drying facility. The dried concentrate is transported to a transport facility by a sealed conveyor 4 and then transported and stored in a concentrate bin. The inflow facility consists of a pressurized inflow facility, and pressure is also applied to the conveyor 4 that transports concentrate, so that the seal is reinforced so that steam and fine copper concentrate dust do not leak from the conveyor 4. ing.

However, after the seal is deteriorated or the inspection hole is opened, there is a problem that the seal becomes defective and leakage from the casing occurs.
On the other hand, even if there is no leakage of steam from the casing, moisture is called inside the conveyor, which causes the presence of concentrate in the casing and causes equipment troubles.

  Therefore, by controlling the inside of the sealed conveyor that transports the dried concentrate at a negative pressure, the leakage of steam and fine copper concentrate dust when the seal deteriorates is prevented, and the moisture caused by moisture inside the casing is prevented. It is necessary to take measures to prevent the presence of mines.

  When this dried concentrate is transported to a transport facility with a sealed conveyor, it prevents vapor leakage from the conveyor and fine copper concentrate dust, and the presence of concentrate by moisture in the conveyor. For prevention, there is a method for managing the inside of the conveyor to a negative pressure (for example, refer to FIG. 1 of Patent Document 1 and reference numeral 11). Since it is not economical in terms of space, more efficient measures are required.

JP 2003-253348 A

  In order to solve the above problems, a new pipe from the bag filter to the sealed conveyor can be used by using a fan and bag filter attached to a steam dryer with sufficient capacity, without newly installing a dedicated dust collector for the conveyor. By connecting, the inside of the conveyor is controlled to a negative pressure, the steam generated inside the conveyor and fine copper concentrate dust are collected, and leakage from the casing and dwelling due to moisture inside the casing are prevented. The present invention provides a steam recovery facility that enables it and a method of operating a steam dryer.

  In view of such a situation, the first invention of the present invention is a steam dryer for drying copper concentrate used as a raw material for copper smelting, which is attached to the steam dryer and carries the copper concentrate A steam recovery pipe that has one end connected to the sealed interior of the conveyor, and the other end connected to a bag filter provided in the steam dryer, a damper provided in the fan attached to the steam dryer, and a bag filter inlet A steam dryer characterized by comprising a steam recovery facility comprising a damper provided in the above.

  In the second invention of the present invention, the vapor discharged from the copper concentrate transported inside the hermetic conveyer and the fine dust of the copper concentrate scattered along with the steam are converted into the first invention. The steam dryer is characterized in that it is recovered through a steam recovery facility.

  A third invention of the present invention is provided in a fan attached to the steam dryer using the steam dryer according to the first and second inventions so that the internal pressure of both the steam dryer and the hermetic conveyor is negative. The steam dryer operates by controlling the internal pressure of the steam dryer and the hermetic conveyor using the damper and the damper at the bag filter inlet.

  According to the present invention, it is possible to reduce the cost of equipment such as newly installing a dedicated dust collecting device on the conveyor, and more efficiently use conventional equipment to generate steam and fine copper concentrate inside the conveyor. There is an industrially significant effect that enables dust to be collected to prevent leakage from the casing and to prevent dwelling due to moisture inside the casing.

It is a conventional steam dryer concentrate drying flowchart. It is a steam dryer concentrate concentrate drying flowchart which concerns on this invention.

Hereinafter, the steam dryer operation method according to the present invention will be described in detail.
Conventionally, as shown in the flow chart of the concentrate drying facility using the steam dryer of FIG. 1, the copper concentrate 1 as a raw material for copper smelting contains 10% of moisture, and for this moisture removal treatment, the steam dryer is used. 2 to obtain concentrate 3 having a moisture content of 1% or less.
The dried concentrate 3 is then transported to the flow facility 5 by a hermetic conveyor 4.

  Moreover, in order to prevent dust generation from the steam dryer 2, a bag filter 6 and a fan 7 are installed to keep the inside of the steam dryer 2 at a negative pressure. The collected dust 8 collected by the bag filter 6 is charged into the conveyor 4 and conveyed to the flow facility 5. Since the inflow facility 5 feeds air by the fan 9 and injects the concentrate, the inside of the inflow facility has a positive pressure. Therefore, the inside of the conveyor also becomes a positive pressure, and this conveyor 4 is a completely sealed hermetic conveyor in order to prevent leakage from the conveyor 4.

The inside of the conveyor 4 also includes dried concentrate and steam generated by drying, and when the hermeticity of the conveyor deteriorates, steam and fine concentrate leak out from the conveyor. In addition, when the internal steam is cooled by the outside air, condensation occurs in the conveyor and moisture is called up, resulting in the presence of concentrate.
Therefore, as a measure for recovering the steam from the conveyor 4, the conveyor 4 is individually provided with a steam recovery facility 10 (see, for example, FIG. 1 and reference numeral 11 of Patent Document 1).

Compared to the conventional equipment as shown in FIG. 1, the present invention has a sufficient capacity as shown in FIG. 2 in order to reduce the installation space and installation cost of the steam recovery equipment (equipment shown in FIG. 1, reference numeral 10). Steam recovery pipe 11 is newly connected to the inside of the conveyor 4 from the fan 7 attached to the steam dryer and the bag filter 6 and the steam can be recovered from the conveyor 4 without newly providing steam recovery equipment. And
In addition, when the throughput of the steam dryer 2 fluctuates, a bag filter inlet damper 12 is newly installed at the inlet of the bag filter 6 in order to achieve both negative pressure management of the steam dryer and negative pressure management of the conveyor. The fan inlet damper 14 and the bag filter inlet damper 12 are adjusted so that the pressure gauges 13a and 13b installed in the respective pipes show negative pressure.

  The steam dryer operation method of the present invention can be used without newly providing a steam recovery facility by using the fan of the steam dryer having sufficient capacity and the facility of FIG. 2 in which piping is newly connected to the conveyor from the bag filter. Steam recovery from the conveyor was possible, and the presence of concentrate due to moisture in the conveyor was reduced, reducing equipment troubles.

As the concentrate processing amount in the steam dryer increases, the amount of dust generated in the steam dryer increases and the amount of steam generated in the conveyor increases, so the exhaust gas flow rate of the steam dryer is increased and both the steam dryer and conveyor are installed. It is necessary to keep negative pressure.
Table 1 shows the results of this operation method.

In the past (Table 1, Case 1), when the bag filter exhaust gas flow rate was increased, the suction amount on the steam dryer side increased, but the suction amount on the conveyor side was insufficient, causing the problem of positive pressure inside the conveyor. However, as shown in Case 2, it is possible to increase the amount of suction from the conveyor side by installing a new damper at the bag filter inlet and controlling the opening to reduce the amount of gas from the steam dryer side. Thus, the pressure in the steam dryer and the conveyor could be adjusted to be negative.
In this way, by controlling the air volume passing through the two control valves (fan inlet damper and bag filter inlet damper), dust generation from the steam dryer can be prevented, and steam recovery from the conveyor can be achieved. .

  According to the steam driver of the present invention and the steam dryer operating method, a pipe is newly connected to the conveyor from the fan and bag filter attached to the steam dryer having sufficient capacity, and a damper is installed at the bag filter inlet. It is possible to control with two control valves so that both the pressure in the steam dryer and the conveyor become negative pressure. Steam recovery from the conveyor and drastic cost reduction without newly installing a dedicated steam recovery facility in the conveyor Can be realized.

1 Copper concentrate (water content 10%)
2 Steam dryer 3 Concentrate (moisture 1% or less)
4 Conveyor 5 Flowing equipment 6 Bag filter 7, 9 Fan 8 Collected dust 10 Steam recovery equipment 11 Steam recovery piping 12 Bag filter inlet damper 13a, 13b Pressure gauge 14 Fan inlet damper

Claims (3)

A steam dryer for drying copper concentrate used as a raw material for copper smelting,
A steam recovery pipe attached to the steam dryer, having one end connected to a sealed interior of a hermetic conveyor that conveys copper concentrate, and the other end connected to a bag filter provided in the steam dryer; ,
A damper provided on a fan attached to the steam dryer;
A steam dryer comprising a steam recovery facility comprising a damper provided at the bag filter inlet.   Inside the hermetic conveyor, steam discharged from the copper concentrate being transported and fine dust of the copper concentrate scattered along with the steam are recovered through the steam recovery facility. The steam dryer according to claim 1.   A damper provided in a fan attached to the steam dryer and a bag filter inlet so that the internal pressure of both the steam dryer and the hermetic conveyor is negative using the steam dryer according to claim 1 or 2. A steam dryer operating method for controlling the internal pressure of the steam dryer and hermetic conveyor using a damper.

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