JP2013129865A - Stirred reaction tank, stirred reaction device and method for controlling chlorine leaching reaction oxidation-reduction potential - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirred reaction tank, a stirred reaction device and a method for controlling chlorine leaching reaction oxidation-reduction potential, when nonferrous metal is leached from nonferrous metal sulfide-containing nonferrous metal raw material using a chlorine gas, which can obtain the high leaching rate of a metallic element(s) without causing the reduction in the availability of the chlorine gas and the increase in a sulfur oxidation rate.SOLUTION: Using a stirred reaction tank 50 provided with: a chlorine gas feeding part 30 including a chlorine blowing nozzle 32 in which the position in the tank of a nozzle tip part 32A provided with a chlorine blowing port 31 is freely adjusted from the outside of the tank; and sensors 40A, 40B for measuring oxidation-reduction potential of measuring oxidation-reduction potential at a plurality of positions including the upper part of the tank and the lower part of the tank, a chlorine gas is fed into the tank by the chlorine gas feeding means, whether or not a difference in the oxidation-reduction potential measured values obtained with the sensors lies within a prescribed value is determined by a controller 60, and the control of moving the tip position of the chlorine blowing nozzle in the stirred reaction tank till the difference reaches within the prescribed value is performed.

Description

  The present invention relates to a stirring reaction vessel, a stirring reaction apparatus, and a method for controlling a chlorine leaching reaction oxidation-reduction potential for leaching nickel raw materials such as non-ferrous metal sulfides.

  Conventionally, as a method for recovering nickel from non-ferrous metal raw materials containing nickel, cobalt, etc., a chlorine leaching electrowinning method in which metal elements in nonferrous metal sulfides are leached with chlorine, and electro nickel is obtained by electrowinning. Known to.

  In the chlorine leaching electrowinning method, the raw material nickel mat is first pulverized by a mill in the pulverization process, then mixed with the electrolytic waste liquid generated in the electrolysis process to form a slurry, and most of it is supplied to the cementation process. . In the cementation process, the mother liquor of the chlorine leaching process is supplied, and the copper contained in the mother liquor undergoes a substitution reaction with nickel in the mat and precipitates as copper sulfide. The precipitated copper sulfide is separated together with the mat cementation residue and supplied to the chlorine leaching process together with the remaining mat slurry and chlorine generated in the electrolysis process.

  In the chlorine leaching process, the residue of the cementation process and nickel, cobalt, iron, copper, lead, etc. contained in the copper sulfide are leached by the oxidizing power of the chlorine gas blown into the chlorine leaching tank. Repeatedly supplied to the tentation process. In the chlorine leaching process, sulfur contained in the raw material is hardly leached but separated as a leaching residue and supplied to the sulfur recovery process.

  The final liquid of the cementation process is sent to the liquid purification process, and elements such as cobalt, iron, copper, zinc and lead other than nickel are contained in the final liquid by the oxidation neutralization method in which chlorine gas and nickel carbonate are added. Removed as purified starch. On the other hand, the final liquid of the liquid purification process is adjusted to pH and then sent to the electrolysis process, and the electronickel is recovered by electrowinning. Chlorine gas generated in the electrolysis process is repeatedly supplied to the chlorine leaching process and the liquid purification process.

  In such a chlorine leaching electrowinning process, chlorine gas generated in the electrolysis process is used, and in the chlorine leaching process in which the metal element in the sulfide raw material is leached by oxidation-reduction reaction in the nickel chloride solution, the chlorine leaching reaction is performed. When the oxidation-reduction potential is low, the metal element remains in the leaching residue, so that a high leaching rate cannot be obtained, causing problems such as nickel loss. Conversely, if the oxidation-reduction potential is too high, Since the sulfur oxidation rate in the sulfide raw material is increased and the chlorine gas leaks to the gas phase side without being reacted, the utilization rate of chlorine is reduced. For example, as described in Patent Document 1 In addition, it is necessary to adjust the redox potential of the leaching reaction to a specified value. By suppressing the fluctuation range from the specified value to a small value, it is possible to achieve a high leaching rate of the metal element without causing a decrease in the utilization rate of chlorine gas or an increase in the sulfur oxidation rate.

  In the technique disclosed in Patent Document 1, in the chlorine leaching operation of nickel raw materials such as non-ferrous metal sulfides, the oxidation-reduction potential (ORP) in the chlorine leaching tank is measured at a predetermined time interval, and the change in the reaction response over time is taken into consideration. By adjusting the opening degree of the chlorine gas flow rate control valve while correcting the deviation in advance, it is possible to prevent the control overshoot and always adjust to the optimum ORP.

JP 2009-91646 A

  However, in order to stably maintain a high leaching rate, it is necessary to keep the fluctuation range of the oxidation-reduction potential in the chlorine leaching tank small. Therefore, when the chlorine concentration was investigated at a plurality of locations inside the stirring tank, depending on the operation conditions, the concentration was high near the chlorine blowing nozzle, and it was low and non-uniform as it moved away from the nozzle. It has been clarified that when the concentration (or redox potential) is high, problems such as an increase in sulfur oxidation rate occur. In addition, when the true (or average) redox potential is too low with respect to the set value, a sufficient leaching rate cannot be obtained. Conversely, when the redox potential is higher than the set value, chlorine into the gas phase can be obtained. There was a problem that gas leakage was concerned, and the utilization rate of chlorine decreased, so that the set value had to be lowered, and it was difficult to ensure a high leaching rate.

  Therefore, in view of the conventional problems as described above, the object of the present invention is to make the spatial bias in the stirring tank of the oxidation-reduction potential in the chlorine leaching reaction smaller than in the past, and to reduce the utilization rate of chlorine gas. To provide a stirring reaction vessel, a stirring reaction apparatus, a chlorine leaching reaction oxidation-reduction potential control method, and a chlorine gas supply control method capable of obtaining a high leaching rate of a metal element without causing an increase in sulfur oxidation rate. .

  Other objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of embodiments described below.

  In order to achieve the above object, the present inventors have conducted earnest research on a chlorine supply control method in a stirring reaction apparatus for recovering nickel and the like from a nonferrous metal raw material by a chlorine leaching electrowinning method. By adjusting the tip position of the chlorine blowing nozzle using the redox potential measurement values at multiple positions including the lower part of the tank in the tank, the spatial bias in the stirring tank of the redox potential in the chlorine leaching reaction can be reduced. The present invention has been completed by finding that it is possible to obtain a high leaching rate of a metal element without reducing the utilization rate of chlorine gas and increasing the sulfur oxidation rate.

  That is, the present invention is a stirred reaction tank for generating a reaction product from a raw material using a reaction gas, and the position of the nozzle tip provided with the reaction gas blowing port in the tank is adjustable. The reaction gas supply means is provided with the reaction gas blowing nozzle, and the reaction gas is supplied from the reaction blowing nozzle into the tank through the reaction blowing nozzle by the reaction gas supply means. And

  The stirred reaction tank according to the present invention is a non-ferrous metal raw material containing a non-ferrous metal sulfide, and the tank from the reaction gas blowing port through the reaction gas blowing nozzle by the reaction gas supply means. Chlorine gas is supplied into the inside, and the non-ferrous metal can be leached from the non-ferrous metal raw material using the chlorine gas.

  The agitation reaction tank may be provided with oxidation-reduction potential measuring means for measuring the oxidation-reduction potential at a plurality of positions including the upper part of the tank and the lower part of the tank.

  Moreover, the stirring reaction tank which concerns on this invention WHEREIN: The said reaction gas supply means shall be equipped with the inner cylinder by which protrusion amount is adjusted by electric control in the nozzle front-end | tip part of the said reaction gas blowing nozzle.

  Further, the present invention is a stirring reaction apparatus, a chlorine gas supply means comprising a chlorine blowing nozzle, wherein the position in the tank of the nozzle tip provided with a chlorine blowing port is adjustable from the outside of the tank; A redox potential measuring means for measuring a redox potential at a plurality of positions including the lower part of the tank is provided. Chlorine gas is supplied into the tank from the chlorine inlet through the chlorine inlet nozzle by the chlorine gas supply means. The difference between the redox potential measured values at the plurality of positions obtained by the stirring reaction tank for leaching the nonferrous metal from the nonferrous metal raw material containing metal sulfide using chlorine gas and the redox potential measuring means is It is determined whether the difference is within the specified value. If the difference is not within the specified value, the difference is increased until the difference is within the specified value. Control means for controlling the position of the tip of the chlorine blowing nozzle in the stirred reaction tank, and the control means obtains the relationship between the deviation from the average chlorine concentration in the lower part of the tank and the chlorine blowing position by fluid simulation. And a database in which coarse adjustment position information of the position of the nozzle tip of the chlorine blowing nozzle in the stirring reaction tank is accumulated, and based on the coarse adjustment position information accumulated in the database, the nozzle tip Coarse adjustment of the position of the part, it is determined whether or not the difference between the redox potential measured values at the plurality of positions obtained by the redox potential measuring means is within a difference prescribed value, and the difference is a difference prescribed value If not within the stirring reaction tank, the difference becomes smaller until the difference falls within the specified difference value. The amount of chlorine gas supplied by the chlorine gas supply means is controlled so that the measured value of the oxidation-reduction potential at the upper part of the tank becomes a specified value in a state where the nozzle tip is moved and the difference is within the specified difference value. It is characterized by controlling.

  In the stirring reaction apparatus according to the present invention, the chlorine gas supply means may include an inner cylinder whose protruding amount is adjusted by electric control at the nozzle tip of the chlorine blowing nozzle.

  Furthermore, the present invention provides a chlorine gas supply means comprising a chlorine blowing nozzle that allows the position of the nozzle tip provided with a chlorine blowing port in the tank to be adjusted from the outside of the tank, and a plurality of positions including a tank upper part and a tank lower part. And a redox potential measuring means for measuring a redox potential in the reactor, and a stirring reaction tank in which chlorine gas is supplied from the chlorine blowing port into the tank through the chlorine blowing nozzle by the chlorine gas supply means. A control method of a chlorine leaching reaction oxidation-reduction potential in a leaching process for leaching the non-ferrous metal from a non-ferrous metal raw material containing sulfide using chlorine gas, the deviation from the average of the chlorine concentration in the lower part of the tank and the chlorine blowing position Of the position of the nozzle tip of the chlorine blowing nozzle in the stirring reaction tank. Based on the rough adjustment position information stored in the database storing the adjustment position information, the position of the nozzle tip is roughly adjusted, and the redox potentials at the plurality of positions obtained by the redox potential measuring means are obtained. It is determined whether or not the difference between the measurement values is within the specified difference value. If the difference is not within the specified difference value, the difference is reduced in the direction until the difference is within the specified difference value. The chlorine gas supply means controls the movement of the nozzle tip in the stirring reaction tank so that the measured oxidation-reduction potential at the upper part of the tank becomes a specified value when the difference is within the specified difference. It is characterized by controlling the supply amount of chlorine gas.

  In the present invention, the reaction gas supply means for supplying the reaction gas into the tank includes a reaction gas blowing nozzle that can adjust the position of the nozzle tip provided with the reaction gas blowing port in the tank. The position of the reaction gas blowing port in the tank can be adjusted to an optimal position with good reaction efficiency, and a reaction product can be efficiently generated from the raw material using the reaction gas.

  For example, in the stirring reaction tank for leaching the non-ferrous metal from a non-ferrous metal raw material containing sulfide of non-ferrous metal using chlorine gas, the position in the tank at the tip of the nozzle provided with a chlorine inlet is from the outside of the tank. By providing chlorine gas supply means with an adjustable chlorine blowing nozzle, the optimal blowing nozzle position has changed due to changes in gas blowing amount and stirring blade rotation speed, stirring blade wear, deposition of reactants, etc. Even in this case, it is possible to adjust the position of the chlorine blowing nozzle to an appropriate position such as a high flow rate, to reduce the spatial bias in the stirring tank of the oxidation-reduction potential in the chlorine leaching reaction, and A high leaching rate of the metal element can be obtained while suppressing a decrease in the gas utilization rate and an increase in the sulfur oxidation rate.

It is sectional drawing which shows typically the structural example of the stirring reaction apparatus to which this invention is applied. It is an enlarged view which shows typically the structure of the chlorine gas supply part of the said stirring reaction apparatus. It is a flowchart for demonstrating the driving | operation procedure of the said stirring reaction apparatus. It is a characteristic view which shows the gas supply position according to the operating condition in the said stirring reaction apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention is applied to, for example, an agitation reaction apparatus 100 configured as shown in FIG.

  The stirring reaction apparatus 100 includes a stirring reaction tank 50 for leaching the non-ferrous metal from a non-ferrous metal raw material containing sulfide of non-ferrous metal using chlorine gas, and a control unit 60 for operating the stirring reaction tank 50. Is provided.

  The stirring reaction tank 50 includes a reaction tank body 10 charged with a non-ferrous metal raw material slurry containing a non-ferrous metal sulfide, a stirrer 20 for stirring the non-ferrous metal raw material slurry stored in the reaction tank main body 10, and A chlorine gas supply unit 30 for supplying chlorine gas into the reaction vessel main body 10 is provided.

  The agitator 20 is attached to the agitation motor 21 installed in the upper center of the reaction vessel main body 10, the rotation shaft 22 of the agitation motor 21 suspended in the reaction vessel body 10, and the rotation shaft 22. The stirring blade 23 thus formed.

  The chlorine gas supply unit 30 is a chlorine gas supply means including a chlorine blowing nozzle 32 that allows the position of the nozzle tip 32A provided with the chlorine blowing port 31 in the reaction tank body 10 to be adjusted from the outside of the tank.

  As shown in the enlarged view of the chlorine gas supply unit 30 in FIG. 2, in this stirring reaction tank 50, the chlorine blowing nozzle 32 of the chlorine gas supply unit 30 includes a fixed cylinder 33 and an inner cylinder to which chlorine gas is supplied. It consists of a movable inner cylinder 36 that is linearly moved by a position adjusting motor 34 via a helicoid mechanism 35.

  The helicoid mechanism 35 includes a rotating portion 37 in which an internal thread (not shown) that engages with an external screw 35A formed on the outer peripheral surface of the movable inner cylinder 36 is formed on the inner peripheral surface. The inner cylinder 36 is a mechanism for converting into linear movement. A gear that meshes with a gear formed on the rotation shaft 34 </ b> A of the inner cylinder position adjusting motor 34 is formed on the outer peripheral surface of the rotating portion 37.

  The movable inner cylinder 36 has an anti-rotation groove 36A formed on the outer peripheral surface thereof, and a projection (not shown) formed at the tip of the fixed cylinder 33 is locked by the anti-rotation groove 36A. Thus, the inner cylinder position adjusting motor 34 moves linearly through the helicoid mechanism 35 without rotating.

  That is, the chlorine blowing nozzle 32 includes a movable inner cylinder 36 whose protruding amount is adjusted by electric control at the nozzle tip.

  The inner cylinder position adjustment motor 34 and the helicoid mechanism 35 are provided in a housing 38 that surrounds the outer periphery of the fixed cylinder 33.

  The operation of the inner cylinder position adjustment motor 34 is controlled by the control unit 60. The control unit 60 is provided outside the reaction vessel main body 10.

  In the stirring reaction tank 50, chlorine gas is supplied into the tank from the chlorine blowing port 31 through the chlorine blowing nozzle 32 by the chlorine gas supply unit 30.

  That is, in this stirring reaction tank 50, the chlorine blowing nozzle 32 of the chlorine gas supply unit 30 for blowing chlorine gas into the tank is a movable inner cylinder that is linearly moved by the inner cylinder position adjusting motor 34 via the helicoid mechanism 35. The position of the tip 36 of the nozzle, that is, the nozzle tip 32A provided with the chlorine inlet 31 in the reaction tank body 10 is adjustable from the outside of the tank.

  In this stirring reaction tank 50, for example, a non-ferrous metal raw material slurry containing a non-ferrous metal sulfide containing nickel, cobalt and the like is charged into the reaction tank body 10, and the chlorine gas supply unit is placed in the reaction tank body 10. The non-ferrous metal leaching is performed by stirring the non-ferrous metal raw material slurry stored in the reaction vessel main body 10 with the stirrer 20 while blowing chlorine gas through 30.

  And in this stirring reaction tank 50, since the position in the said reaction tank main body 10 of the nozzle front-end | tip part 32A in which the said chlorine blowing inlet 31 was provided is adjustable from the outside of a tank, when performing the said nonferrous metal leaching , Can be adjusted to the optimal blowing nozzle position.

  In the stirring reaction tank 50 having such a configuration, the chlorine gas supply unit 30 for supplying chlorine gas to the reaction tank main body 10 for leaching the non-ferrous metal from the non-ferrous metal raw material containing the sulfide of the non-ferrous metal has a chlorine inlet port. Since the chlorine blowing nozzle 32 is provided so that the position of the nozzle tip 32A provided with the nozzle 31 in the tank can be adjusted from the outside of the tank, the gas blowing amount and the rotation speed of the stirring blade 23 are changed, the abrasion of the stirring blade 23, the reaction Even when the optimum blowing nozzle position changes due to accumulation of objects, the position of the chlorine blowing nozzle 32 can be adjusted to an appropriate position such as a high flow rate. Therefore, the spatial deviation of the oxidation-reduction potential in the chlorine leaching reaction in the stirring tank is reduced, and the decrease in the utilization rate of chlorine gas and the increase in the sulfur oxidation rate due to local reactions are suppressed. Can be obtained.

  In the agitator 20 provided in the agitation reaction tank 50, it is desirable to use an agitation blade 23, for example, an inclined disk turbine blade, having high performance in both slurry agitation and chlorine gas leaching reaction.

  Here, in the agitation reaction tank 50, an operator manually operates the control unit 60 provided outside the reaction tank body 10 to control the operation of the inner cylinder position adjustment motor 34. Although the position of the chlorine blowing nozzle 32 can be adjusted, as will be described later, the control unit 60 performs the above-mentioned internal control according to the measurement result of the oxidation-reduction potential of the non-ferrous metal raw material slurry accommodated in the reaction vessel body 10. The operation of the cylinder position adjusting motor 34 may be automatically controlled to adjust the position of the chlorine blowing nozzle 32.

  The stirring reaction tank 50 may include, for example, two oxidation-reduction potential measurement sensors 40A and 40B as oxidation-reduction potential measuring means for measuring the oxidation-reduction potential at a plurality of positions including the upper part and the lower part of the tank. .

  In this stirring reaction tank 50, two redox potential sensors 40A and 40B for measuring the redox potential of the liquid phase portion in the reaction tank body 10, that is, the non-ferrous metal raw material slurry accommodated in the reaction tank body 10 are used. And the redox potential at the upper position of the tank is measured by the redox potential sensor 40A, and the redox potential at the lower position of the tank is measured by the redox potential sensor 40B.

  In the stirring reaction tank 50, the operator manually operates the control unit 60 provided outside the reaction tank main body 10 to control the operation of the inner cylinder position adjustment motor 34. Although the position of the chlorine blowing nozzle 32 can be adjusted, in the stirring reaction apparatus 100 including the stirring reaction tank 50, detection outputs from the two oxidation-reduction potential sensors 40A and 40B are supplied to the control unit 60. The position of the chlorine blowing nozzle 32 is adjusted by automatically controlling the operation of the inner cylinder position adjusting motor 34 by the controller 60.

  In the stirring reaction apparatus 100, the flow rate of the chlorine gas supplied into the reaction vessel main body 10 via the chlorine gas supply unit 30 can be controlled by the flow rate control valve 45.

  The stirring reaction apparatus 100 is operated by the control unit 60 according to the procedure shown in the flowchart of FIG.

  In the stirring reaction apparatus 100, the control unit 60 determines whether or not the difference between the redox potential measured values obtained by the redox potential sensors 40A and 40B, that is, the redox potential measuring means is within a specified value, If the difference is not within the specified value, control is performed to move the tip position of the chlorine blowing nozzle 32 in the stirring reaction tank 50 in a direction in which the difference becomes smaller until the difference is within the specified value. Functions as a means.

  That is, in this agitation reaction apparatus 100, a database is created in advance by obtaining an optimum chlorine blowing position with a large chlorine flow rate distribution and a large flow velocity, which varies depending on operating conditions, deposit conditions, and the like by fluid simulation. 60 refers to the database (step S1), and determines the gas supply position according to the operating conditions as shown in FIG. 4 based on the detection outputs from the two oxidation-reduction potential sensors 40A and 40B and the database. (Step S2) The operation of the inner cylinder position adjusting motor 34 is controlled to roughly adjust the position of the movable inner cylinder 36 of the chlorine blowing nozzle 32 (Step S3).

  The database obtains the relationship between the deviation from the average chlorine concentration in the lower part of the tank and the chlorine blowing position by fluid simulation, and roughly adjusts the position of the nozzle tip 32 of the chlorine blowing nozzle 32 in the stirring reaction tank 50. It is created by accumulating position information.

  In step S3, the control unit 60 performs coarse adjustment of the position of the nozzle tip 32A based on the coarse adjustment position information stored in the database.

  Next, the control unit 60 determines whether or not the difference between the oxidation-reduction potentials at the upper and lower tanks is equal to or less than a specified value at a constant gas flow rate, based on the detection outputs from the two oxidation-reduction potential sensors 40A and 40B. If the determination result is “NO”, that is, if the difference is not equal to or less than the specified value, the operation of the inner cylinder position adjusting motor 34 is controlled so as to be equal to or less than the specified value. Fine adjustment of the position of the movable inner cylinder 36 is performed in the direction in which the difference becomes smaller (step S5).

  Next, when the determination result in step S4 is “YES”, that is, when the difference between the oxidation-reduction potentials at the upper part and the lower part of the tank is equal to or less than a specified value, the control unit 60 determines that the chlorine gas supply unit The flow rate control valve 45 for controlling the flow rate of the chlorine gas supplied into the reaction vessel main body 10 through 30 is controlled, and the oxidation-reduction potential at the upper portion of the vessel is set to a set value in the state where the difference is within the specified difference value. The gas flow rate is adjusted so as to become (step S6).

  And the said control part 60 hold | maintains this driving | running state for 5 to 10 minutes (step S7), and also confirms an operating condition and the condition in a tank (step S8), returns to the said step 1, and returns to the said step 1 By repeating Step S8, the movable inner cylinder 36 of the chlorine blowing nozzle 32 is positioned at the optimum chlorine blowing position where the chlorine concentration distribution and the flow velocity differ depending on the operation conditions and the state of the deposit.

  Thus, in this stirring reaction apparatus 100, the relationship between the deviation from the average chlorine concentration in the lower part of the tank and the chlorine blowing position is obtained by fluid simulation, and the stirring reaction tank of the nozzle tip 32A of the chlorine blowing nozzle 32 is obtained. 50, coarse adjustment of the position of the nozzle tip 32A is performed based on the rough adjustment position information stored in the database that stores the rough adjustment position information of the position within 50, and the two oxidation-reduction potential sensors 40A, 40B. It is determined whether or not the difference between the measured oxidation-reduction potential values is within a prescribed difference value. If the difference is not within the prescribed difference value, the difference is continued until the difference is within the prescribed difference value. The control is performed to move the nozzle tip in the stirring reaction tank in a direction in which the difference becomes smaller, and the difference is within the specified difference value. In this state, the amount of redox potential in the chlorine leaching reaction in the stirring tank is controlled by controlling the amount of chlorine gas supplied by the chlorine gas supply unit 30 so that the measured value of redox potential in the upper part of the tank becomes a specified value. Therefore, it is possible to obtain a high leaching rate of the metal element by reducing the general bias and suppressing the decrease in the utilization rate of chlorine gas and the increase in the sulfur oxidation rate due to local reactions.

In the chlorine leaching process of non-ferrous metal sulfide using this stirring reactor 100, the set value of ORP is set to 550 mV, and the difference between the measured values of the upper and lower tanks can be controlled within 10 mV even when the operating conditions fluctuate. It was possible.
(Comparative Example 1)

  In the conventional chlorine leaching process similar to that in Example 1, the ORP set value was set to 550 mV, and the tip position of the chlorine blowing nozzle was fixed. 50 mV to 100 mV.

  In the embodiment described above, the present invention is applied to the stirring reaction apparatus 100 including the stirring reaction tank 50 for leaching the non-ferrous metal from the non-ferrous metal raw material containing sulfide of the non-ferrous metal using chlorine gas. However, the present invention is not limited only to the above embodiment, and the present invention can be applied to, for example, a stirred reaction tank for generating a reaction product from a raw material using a reaction gas. The reaction gas supply means for supplying the reaction gas is provided with a reaction gas blowing nozzle in which the position in the tank of the nozzle tip provided with the reaction gas blowing port is adjustable. By adjusting the position of the reaction gas inlet to the optimum position with good reaction efficiency, the reaction product can be efficiently generated from the raw material using the reaction gas.

  DESCRIPTION OF SYMBOLS 10 Reaction tank main body, 20 Stirrer, 21 Stirrer motor, 22 Rotating shaft, 23 Stirring blade, 30 Chlorine gas supply part, 31 Chlorine blowing inlet, 32 Chlorine blowing nozzle, 32A Nozzle tip, 33 Fixed cylinder, 34 Inner cylinder position adjustment Motor, 35 Helicoid mechanism, 35A Male thread 35A, 36 Movable inner cylinder, 36A Anti-rotation groove, 37 Rotating part, 38 Housing, 40A, 40B Redox potential measurement sensor, 45 Flow control valve, 50 Stirring reaction tank, 60 Control unit, 100 stirring reactor

Claims (7)

A stirred reaction tank for producing a reaction product from a raw material using a reaction gas,
A reaction gas supply means including a reaction gas injection nozzle that can adjust the position in the tank of the nozzle tip provided with the reaction gas injection port;
A stirring reaction tank, wherein the reaction gas is supplied from the reaction blowing port into the tank through the reaction blowing nozzle by the reaction gas supply means.   The raw material is a non-ferrous metal raw material containing a non-ferrous metal sulfide, and chlorine gas is supplied into the tank from the reaction gas blowing port through the reaction gas blowing nozzle by the reaction gas supply means, The stirred reaction tank according to claim 1, wherein the nonferrous metal is leached from a nonferrous metal raw material using chlorine gas.  The stirred reaction tank according to claim 2, further comprising oxidation-reduction potential measuring means for measuring the oxidation-reduction potential at a plurality of positions including the upper part of the tank and the lower part of the tank.   The said reaction gas supply means is provided with the inner cylinder from which the protrusion amount is adjusted by electric control at the nozzle front-end | tip part of the said reaction gas blowing nozzle, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The stirred reaction tank described. Measure the redox potential at multiple locations including a chlorine gas supply means with a chlorine blowing nozzle that allows the position of the nozzle tip provided with a chlorine blowing port in the tank to be adjusted from the outside of the tank, and the tank upper and lower parts The chlorine gas is supplied from the chlorine blowing port into the tank through the chlorine blowing nozzle by the chlorine gas supplying means, and chlorine gas is supplied from the nonferrous metal raw material containing sulfide of nonferrous metal. A stirred reaction tank for leaching the non-ferrous metal using,
It is determined whether or not the difference between the redox potential measurement values at the plurality of positions obtained by the redox potential measuring means is within a specified value. If the difference is not within the specified value, the difference is specified. Control means for performing control to move the tip position of the chlorine blowing nozzle in the stirring reaction tank in a direction in which the difference becomes smaller until it falls within a value,
The control means obtains the relationship between the deviation from the average of the chlorine concentration in the lower part of the tank and the chlorine blowing position by fluid simulation, and roughly adjusts the position of the tip of the chlorine blowing nozzle in the stirring reaction tank. A database storing information, and performing rough adjustment of the position of the nozzle tip based on the rough adjustment position information stored in the database, at the plurality of positions obtained by the oxidation-reduction potential measuring means. It is determined whether or not the difference between the oxidation-reduction potential measurement values is within a specified difference value. If the difference is not within the specified difference value, the difference is decreased until the difference is within the specified difference value. In the state where the nozzle tip in the stirring reaction tank is moved in the direction and the difference is within the specified difference value. Stirred reactor and controlling the chlorine gas supply amount of the chlorine gas supply means such oxidation reduction potential measurements at the tank top is a specified value.   6. The stirring reaction apparatus according to claim 5, wherein the chlorine gas supply means includes an inner cylinder whose protrusion amount is adjusted by electric control at a nozzle tip of the chlorine blowing nozzle. Measure the redox potential at multiple locations including a chlorine gas supply means with a chlorine blowing nozzle that allows the position of the nozzle tip provided with a chlorine blowing port in the tank to be adjusted from the outside of the tank, and the tank upper and lower parts A non-ferrous metal containing sulfide of non-ferrous metal by a stirring reaction tank having a redox potential measuring means for supplying chlorine gas to the tank from the chlorine blowing nozzle through the chlorine blowing nozzle by the chlorine gas supply means A control method for a chlorine leaching reaction oxidation-reduction potential in a leaching process for leaching the nonferrous metal from a raw material using chlorine gas,
A database in which the relationship between the deviation of the chlorine concentration from the average in the lower part of the tank and the chlorine blowing position is obtained by fluid simulation, and roughly adjusted position information of the position of the nozzle tip of the chlorine blowing nozzle in the stirring reaction tank is accumulated Based on the rough adjustment position information stored in the
Determining whether or not the difference between the redox potential measurement values at the plurality of positions obtained by the redox potential measuring means is within a prescribed difference value;
If the difference is not within the prescribed difference value, until the difference is within the prescribed difference value, control to move the nozzle tip in the stirring reaction tank in a direction to reduce the difference,
Chlorine leaching reaction oxidation characterized by controlling the chlorine gas supply amount by the chlorine gas supply means so that the redox potential measured value in the upper part of the tank becomes a specified value when the difference is within the specified difference value. Control method of reduction potential.

Images