CN115838872A - Filter pressing washing method for tantalum-niobium slurry decomposition liquid - Google Patents
Filter pressing washing method for tantalum-niobium slurry decomposition liquid Download PDFInfo
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Abstract
The invention provides a filter-pressing washing method of tantalum-niobium slurry decomposition liquid, which comprises the following steps: step 1: performing filter pressing on the slurry decomposition liquid to obtain primary tantalum-niobium filtrate and a pulp filter cake, wherein the primary tantalum-niobium filtrate is used for producing tantalum-niobium products; washing the ore pulp filter cake by using process water to recover tantalum and niobium in the ore pulp filter cake to obtain water after cake washing and the washed ore pulp filter cake, wherein the water after cake washing is used for producing tantalum and niobium products or is used as consumed water for other working procedures of tantalum and niobium metallurgy; and squeezing the washed ore pulp filter cake by using high-pressure water to obtain the ore pulp filter cake with low water content. According to the filter-pressing washing method for the tantalum-niobium slurry decomposition liquid, disclosed by the invention, tantalum and niobium are recycled layer by layer, the tantalum-niobium recycling efficiency is improved, and the automation of the filter-pressing washing of tantalum and niobium is realized.
Description
Technical Field
The invention relates to the technical field of tantalum-niobium metallurgy, in particular to a filter pressing washing method for tantalum-niobium slurry decomposition liquid.
Background
Tantalum and niobium belong to rare metals with high boiling point and high melting point, have the excellent characteristics of high strength, fatigue resistance, deformation resistance, corrosion resistance, easy heat conduction, superconductivity, unipolar conductivity, gas absorption and the like, and are widely applied to the industries of electronics, aerospace, machinery industry, atomic reactor and the like.
The most important industrial minerals of tantalum and niobium comprise tantalum niobate, and the main mineral is tantalite; the other is titanium tantalate niobate, and the main minerals are pyrochlore, fine crystal and the like. The step of extracting tantalum and niobium from the ore generally comprises: slurry mixing, decomposition, filter pressing, extraction, back extraction and production of a tantalum product, namely a niobium product. The step of size mixing refers to mixing water and the powder to obtain tantalum-niobium size; the decomposition refers to decomposing the tantalum-niobium slurry by using hydrofluoric acid-concentrated sulfuric acid, wherein the tantalum, niobium, titanium, silicon and iron enter the solution in a soluble component manner, and the rare earth and radioactive elements uranium and thorium are remained in the slag to obtain tantalum-niobium slurry decomposition liquid; the step of filter pressing refers to filter pressing of the tantalum-niobium slurry decomposition liquid, and the primary tantalum-niobium filtrate is obtained through solid-liquid separation. The recovery rate of tantalum and niobium in the filter pressing is related to the final yield of tantalum and niobium products. Therefore, a set of scientific and reasonable filter pressing washing method for the tantalum-niobium slurry decomposition liquid is provided, and the improvement of the tantalum-niobium recovery rate is of great significance.
Disclosure of Invention
Based on the above purpose, the invention provides a filter pressing washing method for tantalum-niobium slurry decomposition liquid, which solves or partially solves the technical problems:
the filter pressing washing method of the tantalum-niobium slurry decomposition liquid comprises the following steps:
step 1: carrying out filter pressing on the slurry decomposition liquid to obtain primary tantalum-niobium filtrate and ore pulp filter cake, wherein the primary tantalum-niobium filtrate is used for producing tantalum-niobium products; washing the ore pulp filter cake by using process water to recover tantalum and niobium in the ore pulp filter cake to obtain water after cake washing and the washed ore pulp filter cake, wherein the water after cake washing is used for producing tantalum and niobium products or used as consumed water for other working procedures of tantalum and niobium metallurgy; squeezing the washed ore pulp filter cake by using high-pressure water to obtain an ore pulp filter cake with low water content;
step 2: uniformly mixing the size mixing liquid and the low-water-content ore pulp filter cake obtained in the step (1) to obtain tantalum-niobium slag pulp;
and 3, step 3: performing filter pressing on the tantalum-niobium slag slurry obtained in the step 2 to recover tantalum and niobium in the tantalum-niobium slag slurry to obtain a secondary tantalum-niobium filtrate and a slag slurry filter cake, and reusing the secondary tantalum-niobium filtrate for washing the ore slurry filter cake in the step 1; washing the slag slurry filter cake by using slag slurry washing water to wash away impurities in the slag slurry filter cake to obtain discharged water and the washed slag slurry filter cake; and squeezing the washed slag slurry filter cake by using high-pressure water to obtain the slag slurry filter cake with low water content.
Further, step 1 specifically includes:
stopping conveying of the slurry decomposition liquid through the liquid level control of the primary tantalum-niobium filtrate;
and controlling the shutdown of water delivery after cake washing through the liquid level of the secondary tantalum-niobium filtrate and the pressure of high-pressure water.
Further, the shutdown of the slurry decomposition liquid conveying is controlled through the liquid level of the primary tantalum-niobium filtrate, and the shutdown method specifically comprises the following steps:
automatically starting a decomposition liquid delivery pump, a decomposition liquid cut-off valve and a primary tantalum-niobium filtrate cut-off valve, delivering the slurry decomposition liquid to a pulp filter press for filter pressing, and outputting primary tantalum-niobium filtrate;
and when the liquid level of the primary tantalum-niobium filtrate is not changed any more, stopping the decomposition liquid conveying pump, the decomposition liquid stop valve and the primary tantalum-niobium filtrate stop valve, and cutting off the conveying of the slurry decomposition liquid and the primary tantalum-niobium filtrate to obtain the ore pulp filter cake.
Further, the shutdown of water delivery after cake washing is controlled by the liquid level of the secondary tantalum-niobium filtrate and the pressure of high-pressure water, and the method specifically comprises the following steps:
automatically starting a secondary tantalum-niobium filtrate input pump, a secondary tantalum-niobium filtrate input cut-off valve and a cake washing water cut-off valve, conveying secondary tantalum-niobium filtrate in a secondary tantalum-niobium filtrate storage tank to a pulp filter press to wash pulp filter cakes, and outputting cake washing water;
when the liquid level of the secondary tantalum-niobium filtrate storage tank reaches a preset liquid level, stopping the secondary tantalum-niobium filtrate input pump, stopping the secondary tantalum-niobium filtrate input cut-off valve, and cutting off the input of the secondary tantalum-niobium filtrate to obtain a washed ore pulp filter cake;
automatically starting a high-pressure water delivery pump and a high-pressure water cut-off valve, and delivering high-pressure water to the ore pulp filter press to press the washed ore pulp filter cake;
and when the pressure of the high-pressure water is equal to the lift of the high-pressure water delivery pump, shutting down the high-pressure water delivery pump, the high-pressure water cut-off valve and the cake washing water cut-off valve, and cutting off the delivery of the high-pressure water and the cake washing water to obtain the low-water-content ore pulp filter cake.
Further, step 2 specifically includes:
automatically starting a stirrer arranged in the slag size mixing tank;
automatically opening a slurry regulating stop valve, enabling the slurry regulating liquid to automatically flow into the slag slurry regulating tank, and stopping the slurry regulating stop valve when the liquid level of the slurry regulating liquid reaches a preset liquid level;
and unloading the ore pulp filter cake with low water content into an ore slag size mixing tank, stirring and mixing the size mixing liquid and the ore pulp filter cake with low water content uniformly in the ore slag size mixing tank, and turning off the stirrer to obtain the tantalum-niobium slag pulp.
Further, step 3 specifically includes:
controlling the shutdown of the conveying of the tantalum-niobium slag slurry through the liquid level of the secondary tantalum-niobium filtrate;
the shutdown of the delivery of the discharged water is controlled by the liquid level of the slag slurry washing water and the pressure of high-pressure water.
Further, the shutdown of the tantalum-niobium slag slurry conveying is controlled through the liquid level of the secondary tantalum-niobium filtrate, and the shutdown specifically comprises the following steps:
automatically starting a tantalum-niobium slag slurry conveying pump, a tantalum-niobium slag slurry stop valve, a secondary tantalum-niobium filtrate output pump and a secondary tantalum-niobium filtrate output stop valve, conveying the tantalum-niobium slag slurry to a slag slurry filter press for filter pressing, and outputting a secondary tantalum-niobium filtrate to a secondary tantalum-niobium filtrate storage tank;
and when the liquid level of the secondary tantalum-niobium filtrate storage tank does not change any more, stopping the tantalum-niobium slurry conveying pump, the tantalum-niobium slurry stop valve, the secondary tantalum-niobium filtrate output pump and the secondary tantalum-niobium filtrate output stop valve, and cutting off the conveying of the tantalum-niobium slurry and the secondary tantalum-niobium filtrate to obtain a slurry filter cake.
Further, the shutdown of external drainage delivery is controlled through the liquid level of the slag slurry washing water and the pressure of high-pressure water, and the method specifically comprises the following steps:
automatically opening a slag slurry washing water delivery pump, a slag slurry washing water cut-off valve and an external drainage cut-off valve, delivering the slag slurry washing water to a slag slurry filter press to wash a slag slurry filter cake, and outputting external drainage water;
when the liquid level of the slag slurry washing water reaches a preset liquid level, turning off a slag slurry washing water delivery pump and a slag slurry washing water cut-off valve, and cutting off the delivery of the slag slurry washing water to obtain a washed slag slurry filter cake;
automatically starting a high-pressure water delivery pump and a high-pressure water cut-off valve, delivering high-pressure water to a slurry filter press, and squeezing residual discharged water in a washed slurry filter cake;
and when the pressure of the high-pressure water is equal to the lift of the high-pressure water delivery pump, shutting down the high-pressure water delivery pump, the high-pressure water cut-off valve and the external drainage cut-off valve, and cutting off the delivery of the high-pressure water and the external drainage to obtain the low-water-content slag slurry filter cake.
From the above, the filter-pressing washing method for the tantalum-niobium slurry decomposition liquid provided by the invention has the following beneficial effects:
inputting the slurry decomposition liquid into a pulp filter press for primary filter pressing, and then, recovering for the first time to obtain a primary tantalum-niobium filtrate; adding the pulp mixing liquid into the low-water-content ore pulp filter cake containing residual tantalum and niobium to mix into tantalum and niobium slag slurry, inputting the tantalum and niobium slag slurry into a slag slurry filter press to perform secondary filter pressing, and then performing secondary recovery to obtain secondary tantalum and niobium filtrate; the recovered secondary tantalum-niobium filtrate has low tantalum-niobium content, and is returned to the ore pulp filter press to be used as washing water to wash the ore pulp filter cake so as to recover the secondary tantalum-niobium filtrate and tantalum-niobium in the ore pulp filter cake again. And primary filter pressing, secondary filter pressing and secondary tantalum-niobium filtrate are returned to the ore pulp filter press and serve as washing water to wash the ore pulp filter cake, tantalum and niobium are recycled layer by layer in a progressive mode, and tantalum-niobium recycling efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a system schematic diagram of a filter-pressing washing method of a tantalum-niobium slurry decomposition liquid according to an embodiment of the present invention.
In the figure: 1-a pulp filter press; 11-a decomposition liquid delivery pump; 12-a decomposition liquid cut-off valve; 13-primary tantalum-niobium filtrate cut-off valve; 14-inputting the secondary tantalum-niobium filtrate into a pump; 15-inputting the secondary tantalum-niobium filtrate into a cut-off valve; 16-water cut-off valve after cake washing; 17-a high-pressure water delivery pump; 18-high pressure water shut-off valve; 2-slag slurry mixing tank; 21-a stirrer; 22-slurry adjusting shut-off valve; 23-a tantalum-niobium slag slurry delivery pump; 24-tantalum-niobium slag slurry cut-off valve; 3-slurry filter press; 31-secondary tantalum-niobium filtrate output pump; 32-secondary tantalum-niobium filtrate output cut-off valve; 33-a slurry washing water delivery pump; 34-a slag pulp washing water stop valve; 35-an external water discharge cut-off valve; 4-secondary tantalum-niobium filtrate storage tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. As used herein, the terms "first," "first," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. "communication" or "communicating" and like terms are not limited to physical or mechanical communication, but may include electrical communication, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
One or more embodiments of the invention provide a filter-pressing washing method for tantalum-niobium slurry decomposition liquid.
The overall scheme is as follows: and the slurry decomposition liquid is subjected to primary filter pressing recovery of tantalum and niobium by a pulp filter press 1, secondary filter pressing recovery of tantalum and niobium by a slag slurry filter press 3, and each stage of filter pressing recovery comprises three-step progressive tantalum and niobium recovery operations of filter pressing, washing and squeezing, so that the tantalum and niobium recovery rate is improved. In addition, the device is provided with a pump, a valve, a liquid level meter and other controls, so that the automation of a filter pressing and washing process is realized, the filter pressing and washing time of the tantalum-niobium decomposition slurry is shortened, and the recovery efficiency of tantalum-niobium is improved.
The technical solutions of one or more embodiments of the present invention will be described in detail below with reference to specific embodiments.
The filter pressing washing method of the tantalum-niobium slurry decomposition liquid comprises the following steps:
step 1: performing filter pressing on the slurry decomposition liquid to obtain a primary tantalum-niobium filtrate and an ore pulp filter cake, wherein the primary tantalum-niobium filtrate is used for producing tantalum-niobium products; washing the ore pulp filter cake by using process water to recover tantalum and niobium in the ore pulp filter cake to obtain water after cake washing and the washed ore pulp filter cake, wherein the water after cake washing is used for producing tantalum and niobium products or used as consumed water for other working procedures of tantalum and niobium metallurgy; and squeezing the washed ore pulp filter cake by using high-pressure water to obtain the ore pulp filter cake with low water content. .
More specifically: inputting the slurry decomposition liquid into an ore pulp filter press 1 for filter pressing to obtain a filtrate, namely a primary tantalum-niobium filtrate, and a filter cake, namely an ore pulp filter cake; when the system starts to operate, washing the ore pulp filter cake by using process water to recover tantalum and niobium in the ore pulp filter cake, introducing secondary tantalum and niobium filtrate to wash the ore pulp filter cake after the system continuously operates to generate the secondary tantalum and niobium filtrate, and washing out tantalum and niobium in the ore pulp filter cake to obtain water after washing the cake containing tantalum and niobium; and (3) squeezing the ore pulp filter cake washed by the secondary tantalum-niobium filtrate by using high pressure water, wherein the squeezed liquid contains residual tantalum-niobium and is mixed into water after cake washing. And (4) performing filter pressing, washing and squeezing, and extracting and recovering tantalum and niobium layer by layer to obtain the ore pulp filter cake with low water content. The primary tantalum-niobium filtrate is tantalum-niobium enriched phase liquid, and the operations such as extraction, back extraction and the like are carried out on the tantalum-niobium enriched phase liquid to obtain pure tantalum-niobium liquid for preparing tantalum-niobium products; the tantalum and niobium in the water after cake washing is relatively less, so that the pure tantalum and niobium liquid can be obtained through extraction, back extraction and other operations, and the pure tantalum and niobium liquid can also be used as consumed water for the whole tantalum and niobium metallurgy process, for example, the pure tantalum and niobium liquid can be used as size mixing water for mixing the grinded ore into ore size.
In some embodiments, step 1 specifically includes:
step 1A: and controlling the shutdown of the transportation of the slurry decomposition liquid through the liquid level of the primary tantalum-niobium filtrate.
Specifically, the method comprises the following steps: the inlet of the ore pulp filter press 1 is connected with a slurry decomposed liquid storage tank through a decomposed liquid pipeline, and a decomposed liquid delivery pump 11 and a decomposed liquid cut-off valve 12 are arranged on the decomposed liquid pipeline. An outlet of the ore pulp filter press 1 is connected with a primary tantalum-niobium filtrate storage tank through a primary tantalum-niobium filtrate pipeline, and a primary tantalum-niobium filtrate cut-off valve 13 is arranged on the primary tantalum-niobium filtrate pipeline.
In some embodiments, the decomposition fluid delivery pump 11, the decomposition fluid shut-off valve 12 and the primary tantalum-niobium filtrate shut-off valve 13 are automatically opened, and the slurry decomposition fluid is delivered to the pulp filter press 1 to press-filter the primary tantalum-niobium filtrate. And (3) the slurry decomposition liquid enters the ore pulp filter press 1, the impurity particle suspended matters are gradually accumulated into a filter cake, the filter cake continuously intercepts subsequent particles, so that a filter cake layer continuously grows, the thickness of the filter cake layer continuously increases, the filter cake layer grows to a certain thickness along with the continuous filtration, the pressure difference occurs, the primary tantalum-niobium filtrate cannot be filtered out, and the liquid level of the primary tantalum-niobium filtrate does not change any more.
Therefore, when the liquid level of the primary tantalum-niobium filtrate is not changed any more, the decomposition liquid conveying pump 11, the decomposition liquid cut-off valve 12 and the primary tantalum-niobium filtrate cut-off valve 13 are stopped, and the conveying of the slurry decomposition liquid and the primary tantalum-niobium filtrate is cut off, so that the ore pulp filter cake is obtained. The level of the primary tantalum-niobium filtrate is monitored by a liquid level meter, such as a magnetic flap liquid level meter or a radar liquid level meter installed in the primary tantalum-niobium filtrate storage tank.
And in order to recover tantalum and niobium in the ore pulp filter cake, the step 1B is arranged for washing and squeezing the ore pulp filter cake.
Step 1B: and controlling the shutdown of water delivery after cake washing through the liquid level of the secondary tantalum-niobium filtrate and the pressure of high-pressure water.
In some embodiments, the secondary tantalum-niobium filtrate input pump 14, the secondary tantalum-niobium filtrate input cut-off valve 15 and the after-cake-washing water cut-off valve 16 are automatically opened, the secondary tantalum-niobium filtrate in the secondary tantalum-niobium filtrate storage tank 4 is conveyed to the pulp filter press 1 to wash the pulp filter cake, and after-cake-washing water is output.
Specifically, the method comprises the following steps: an inlet of the ore pulp filter press 1 is connected with a secondary tantalum-niobium filtrate storage tank 4 through a secondary tantalum-niobium filtrate input pipeline, and a secondary tantalum-niobium filtrate input pump 14 and a secondary tantalum-niobium filtrate input cut-off valve 15 are arranged on the secondary tantalum-niobium filtrate input pipeline. An outlet of the ore pulp filter press 1 is connected with a cake washing rear water storage tank through a cake washing rear water pipeline, and a cake washing rear water cut-off valve 16 is arranged on the cake washing rear water pipeline.
The secondary tantalum-niobium filtrate needs to be quantitatively input, the quantification is realized by controlling the liquid level, and a liquid level meter is arranged in the secondary tantalum-niobium filtrate storage tank 4. In some embodiments, when the liquid level of the secondary tantalum-niobium filtrate storage tank 4 reaches a preset liquid level, the secondary tantalum-niobium filtrate input pump 14 and the secondary tantalum-niobium filtrate input cut-off valve 15 are turned off, the input of the secondary tantalum-niobium filtrate is cut off, the quantitative input of the secondary tantalum-niobium filtrate is completed, and the washed ore pulp filter cake is obtained. And giving the required amount of the secondary tantalum-niobium filtrate and the initial liquid level value to obtain a preset liquid level.
The water content of the washed ore pulp filter cake is high, and the water contains tantalum and niobium, so that the water is squeezed out by squeezing the washed ore pulp filter cake through high-pressure water. Specifically, the inlet of the pulp filter press 1 is connected with a high-pressure water storage tank through a high-pressure water pipeline, and the high-pressure water pipeline is provided with a high-pressure water delivery pump 17, a high-pressure water cut-off valve 18 and a pressure transmitter.
And (3) automatically starting the high-pressure water delivery pump 17 and the high-pressure water cut-off valve 18, and delivering high-pressure water to the pulp filter press 1 to press washed water in the washed pulp filter cake. And when the pressure of the high-pressure water is equal to the lift of the high-pressure water delivery pump 17, shutting down the high-pressure water delivery pump 17, the high-pressure water cut-off valve 18 and the cake washing water cut-off valve 16, and cutting off the delivery of the high-pressure water and the cake washing water to obtain the low-water-content ore pulp filter cake.
And 2, step: and (4) automatically conveying the slurry mixing liquid and the low-water-content ore pulp filter cake to the slag slurry mixing tank 2 in sequence, and uniformly mixing to obtain tantalum-niobium slag slurry. In other words, the low water content pulp filter cake is dissolved again to further extract tantalum and niobium. The method specifically comprises the following steps:
step 2A: the stirrer 21 provided in the slag slurrying tank 2 is automatically started, that is, the stirrer 21 is started first and then fed. If stirring is performed after the addition, the starting resistance of the stirrer 21 is large, the power supply current of the stirrer 21 increases suddenly, and the stirrer 21 may be burned out.
And step 2B: the slurry adjusting stop valve 22 is automatically opened, the slurry adjusting liquid automatically flows into the slag slurry adjusting tank 2, and when the liquid level of the slurry adjusting liquid reaches the preset liquid level, the slurry adjusting stop valve 22 is closed. Similarly, if the gravity flow conditions at a high place are not met, the slurry adjusting pump can be arranged for conveying.
And step 2C: and (3) unloading the ore pulp filter cake with low water content into the ore pulp mixing tank 2, stirring and mixing the mixed pulp and the ore pulp filter cake with low water content uniformly in the ore pulp mixing tank 2, and turning off the stirrer 21 to obtain the tantalum-niobium slag pulp.
After the stirrer 21 is started, the size mixing liquid and the pulp filter cake are added in sequence. The blending slurry is added firstly to bottom and wet the peripheral wall of the slag blending tank 2, so that the problems that the low-water-content ore pulp filter cake is added firstly to adhere to the peripheral wall, the wetting and mixing are not thorough and uniform, and dry materials are agglomerated and the like are solved. The mixing and stirring can be measured by time, for example, the slurry mixing liquid and the low water content ore pulp filter cake are stirred for 1 to 2h in the slag slurry mixing tank 2.
And 3, step 3: and (3) automatically conveying the tantalum-niobium slag slurry, the slag slurry washing water and the high-pressure water to a slag slurry filter press 3 in sequence to obtain secondary tantalum-niobium filtrate, discharged water and a low-water-content slag slurry filter cake. And performing filter pressing, washing and squeezing unit operation on the tantalum-niobium slag slurry to further extract tantalum and niobium in the tantalum-niobium slag slurry.
Specifically, the method comprises the following steps: inputting the tantalum-niobium slag slurry into a slag slurry filter press 3 for filter pressing, and obtaining a filtrate, namely a secondary tantalum-niobium filtrate, through filter pressing, wherein a filter cake is a slag slurry filter cake; introducing slurry washing water to wash the slurry filter cake, washing out tantalum and niobium in the slurry filter cake to obtain external drainage water, wherein the contents of tantalum and niobium and other impurities in the external drainage water are very low, and the external drainage water meets the environmental-friendly discharge standard; and (3) squeezing the slag pulp filter cake washed by the slag pulp washing water by high-pressure water, squeezing out liquid, and mixing the liquid into discharged water. And (3) performing filter pressing, washing and squeezing, and removing tantalum and niobium of the filter cake layer by layer to obtain the low-water-content slag slurry filter cake. The secondary tantalum-niobium filtrate contains part of tantalum-niobium, is recovered from the system, is stored in a secondary tantalum-niobium filtrate storage tank 4, and is conveyed to the ore pulp filter press 1 for washing ore pulp filter cakes.
In some embodiments, step 3 specifically includes:
step 3A: and controlling the shutdown of the transportation of the tantalum-niobium slag slurry through the liquid level of the secondary tantalum-niobium filtrate.
Specifically, the method comprises the following steps: an inlet of the slag slurry filter press 3 is connected with the slag slurry mixing tank 2 through a slag slurry pipeline, and a tantalum-niobium slag slurry delivery pump 23 and a tantalum-niobium slag slurry cut-off valve 24 are arranged on the slag slurry pipeline. The outlet of the slag slurry filter press 3 is connected with a secondary tantalum-niobium filtrate storage tank 4 through a secondary tantalum-niobium filtrate output pipeline, and a secondary tantalum-niobium filtrate output pump 31 and a secondary tantalum-niobium filtrate output cut-off valve 32 are arranged on the secondary tantalum-niobium filtrate output pipeline.
In some embodiments, the tantalum-niobium slurry conveying pump 23, the tantalum-niobium slurry cut-off valve 24, the secondary tantalum-niobium filtrate output pump 31 and the secondary tantalum-niobium filtrate output cut-off valve 32 are automatically opened, the tantalum-niobium slurry is conveyed to the slurry filter press 3 for filter pressing, and the secondary tantalum-niobium filtrate is output to the secondary tantalum-niobium filtrate storage tank 4. Tantalum niobium slag slurry enters the slag slurry filter press 3, the impurity particle suspended matter is gradually accumulated into a filter cake, the filter cake continuously intercepts subsequent particles, then a filter cake layer continuously grows, the thickness is continuously increased, the filter cake layer grows to a certain thickness and then has a pressure difference, the secondary tantalum niobium filtrate is not filtered, and the liquid level of the secondary tantalum niobium filtrate is not changed.
Therefore, when the liquid level of the secondary tantalum-niobium filtrate storage tank 4 does not change any more, the tantalum-niobium slag slurry conveying pump 23, the tantalum-niobium slag slurry cut-off valve 24, the secondary tantalum-niobium filtrate output pump 31 and the secondary tantalum-niobium filtrate output cut-off valve 32 are stopped, the conveyance of the tantalum-niobium slag slurry and the secondary tantalum-niobium filtrate is cut off, and a slag slurry filter cake is obtained.
And 3B, washing and squeezing the slag slurry filter cake in order to filter out tantalum and niobium in the slag slurry filter cake.
And step 3B: the shutdown of the delivery of the discharged water is controlled by the liquid level of the slag slurry washing water and the pressure of high-pressure water.
Specifically, the method comprises the following steps: the inlet of the slag slurry filter press 3 is connected with a slag slurry washing water storage tank through a slag slurry washing water pipeline, and the slag slurry washing water pipeline is provided with a slag slurry washing water delivery pump 33 and a slag slurry washing water cut-off valve 34. The outlet of the slag slurry filter press 3 is connected with an external drainage storage tank through an external drainage pipeline, and an external drainage cut-off valve 35 is arranged on the external drainage pipeline.
In some embodiments, the slurry washing water delivery pump 33, the slurry washing water shut-off valve 34 and the external drainage water shut-off valve 35 are automatically opened, and the slurry washing water is delivered to the slurry filter press 3 to wash the slurry filter cake and output external drainage water.
The residue slurry washing water needs to be input quantitatively, the quantification is realized by controlling the liquid level, and a liquid level meter is installed in a residue slurry washing water storage tank. In some embodiments, when the liquid level of the slurry washing water reaches a preset liquid level, the slurry washing water delivery pump 33 and the slurry washing water cut-off valve 34 are turned off, the output of the slurry washing water is cut off, and the quantitative input of the slurry washing water is completed, so that the washed slurry filter cake is obtained. And setting the required amount of the slag slurry washing water and the initial liquid level value to obtain the preset liquid level of the slag slurry washing water.
The washed slag slurry filter cake has high water content and contains a small amount of tantalum and niobium, so that the washed slag slurry filter cake is squeezed by high-pressure water to squeeze out water. Specifically, the inlet of the residue slurry filter press 3 is connected with a high-pressure water storage tank through a high-pressure water pipeline, and the high-pressure water pipeline of the residue slurry filter press 3 and the high-pressure water pipeline of the ore pulp filter press 1 can share one pipeline.
And (3) automatically starting the high-pressure water delivery pump 17 and the high-pressure water cut-off valve 18, and delivering high-pressure water to the outer drainage of the pressed and washed slag slurry filter cake in the slag slurry filter press 3. And when the pressure of the high-pressure water is equal to the lift of the high-pressure water delivery pump 17, shutting down the high-pressure water delivery pump 17, the high-pressure water shut-off valve 18 and the external drainage shut-off valve 35, and shutting off the delivery of the high-pressure water and the external drainage to obtain the low-water-content slag slurry filter cake.
In some embodiments, the slurry filter press 1 and the slurry filter press 3 are membrane filter presses, which may be XMG/870-30U. The consumed water of the size mixing liquid, the slag pulp washing water and the like can be from a certain procedure in the tantalum-niobium metallurgical process, but the tantalum-niobium content in the size mixing liquid and the slag pulp washing water is ensured to be reduced in sequence and is lower than that in the secondary tantalum-niobium filtrate, so that the waste liquid in the metallurgical process can be recycled, and the external discharge of the waste liquid is reduced. In addition, the process water such as relatively pure tap water and the like which is output is preferably selected as the pulp mixing liquid and the slag pulp washing water.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to suggest that the scope of the invention includes the claims being limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made without departing from the spirit or scope of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The filter pressing washing method of the tantalum-niobium slurry decomposition liquid is characterized by comprising the following steps:
step 1: carrying out filter pressing on the slurry decomposition liquid to obtain primary tantalum-niobium filtrate and ore pulp filter cake, wherein the primary tantalum-niobium filtrate is used for producing tantalum-niobium products; washing the ore pulp filter cake by using process water to recover tantalum and niobium in the ore pulp filter cake to obtain water after cake washing and the washed ore pulp filter cake, wherein the water after cake washing is used for producing tantalum and niobium products or is used as consumed water for other processes of tantalum and niobium metallurgy; squeezing the washed ore pulp filter cake by using high-pressure water to obtain an ore pulp filter cake with low water content;
step 2: uniformly mixing the size mixing liquid and the low-water-content ore pulp filter cake obtained in the step (1) to obtain tantalum-niobium slag pulp;
and step 3: performing filter pressing on the tantalum-niobium slag slurry obtained in the step 2 to recover tantalum and niobium in the tantalum-niobium slag slurry to obtain a secondary tantalum-niobium filtrate and a slag slurry filter cake, and reusing the secondary tantalum-niobium filtrate for washing the ore slurry filter cake in the step 1; washing the slag slurry filter cake by using slag slurry washing water to wash away impurities in the slag slurry filter cake to obtain discharged water and the washed slag slurry filter cake; and squeezing the washed slag slurry filter cake by using high-pressure water to obtain the slag slurry filter cake with low water content.
2. The filter-pressing washing method for the tantalum-niobium slurry decomposition liquid according to claim 1, wherein the step 1 specifically comprises the following steps:
stopping conveying of the slurry decomposition liquid through the liquid level control of the primary tantalum-niobium filtrate;
and controlling the shutdown of water delivery after cake washing through the liquid level of the secondary tantalum-niobium filtrate and the pressure of high-pressure water.
3. The filter-pressing washing method for tantalum-niobium slurry decomposition liquid as claimed in claim 2, wherein the shutdown of slurry decomposition liquid delivery is controlled by the liquid level of primary tantalum-niobium filtrate, and the method specifically comprises the following steps:
automatically starting a decomposition liquid delivery pump, a decomposition liquid cut-off valve and a primary tantalum-niobium filtrate cut-off valve, delivering the slurry decomposition liquid to a pulp filter press for filter pressing, and outputting primary tantalum-niobium filtrate;
and when the liquid level of the primary tantalum-niobium filtrate is not changed any more, stopping the decomposition liquid conveying pump, the decomposition liquid stop valve and the primary tantalum-niobium filtrate stop valve, and cutting off the conveying of the slurry decomposition liquid and the primary tantalum-niobium filtrate to obtain the ore pulp filter cake.
4. The pressure filtration washing method for tantalum-niobium slurry decomposition liquid as claimed in claim 2, wherein the shutdown of water delivery after cake washing is controlled by the liquid level of secondary tantalum-niobium filtrate and the pressure of high-pressure water, and the method specifically comprises the following steps:
automatically starting a secondary tantalum-niobium filtrate input pump, a secondary tantalum-niobium filtrate input cut-off valve and a cake washing water cut-off valve, conveying secondary tantalum-niobium filtrate in a secondary tantalum-niobium filtrate storage tank to a pulp filter press to wash pulp filter cakes, and outputting cake washing water;
when the liquid level of the secondary tantalum-niobium filtrate storage tank reaches a preset liquid level, stopping the secondary tantalum-niobium filtrate input pump, stopping the secondary tantalum-niobium filtrate input stop valve, and cutting off the input of the secondary tantalum-niobium filtrate to obtain a washed ore pulp filter cake;
automatically starting a high-pressure water delivery pump and a high-pressure water cut-off valve, and delivering high-pressure water to the ore pulp filter press to press the washed ore pulp filter cake; and when the pressure of the high-pressure water is equal to the lift of the high-pressure water delivery pump, shutting down the high-pressure water delivery pump, the high-pressure water cut-off valve and the cake washing water cut-off valve, and cutting off the delivery of the high-pressure water and the cake washing water to obtain the low-water-content ore pulp filter cake.
5. The filter-pressing washing method for the tantalum-niobium slurry decomposition liquid as claimed in claim 1, wherein the step 2 specifically comprises:
automatically starting a stirrer arranged in the slag slurry mixing tank;
automatically opening a slurry regulating stop valve, enabling the slurry regulating liquid to automatically flow into the slag slurry regulating tank, and stopping the slurry regulating stop valve when the liquid level of the slurry regulating liquid reaches a preset liquid level;
and unloading the ore pulp filter cake with low water content into an ore slag size mixing tank, stirring and mixing the size mixing liquid and the ore pulp filter cake with low water content uniformly in the ore slag size mixing tank, and turning off the stirrer to obtain the tantalum-niobium slag pulp.
6. The filter-pressing washing method for the tantalum-niobium slurry decomposition liquid as claimed in claim 1, wherein the step 3 specifically comprises:
controlling the shutdown of the conveying of the tantalum-niobium slag slurry through the liquid level of the secondary tantalum-niobium filtrate;
the shutdown of the delivery of the discharged water is controlled by the liquid level of the slag slurry washing water and the pressure of high-pressure water.
7. The pressure filtration washing method for tantalum-niobium slurry decomposition liquid as claimed in claim 6, wherein the shutdown of tantalum-niobium slag slurry transportation is controlled by the liquid level of the secondary tantalum-niobium filtrate, and the method specifically comprises the following steps:
automatically starting a tantalum-niobium slag slurry conveying pump, a tantalum-niobium slag slurry cut-off valve, a secondary tantalum-niobium filtrate output pump and a secondary tantalum-niobium filtrate output cut-off valve, conveying the tantalum-niobium slag slurry to a slag slurry filter press for filter pressing, and outputting a secondary tantalum-niobium filtrate to a secondary tantalum-niobium filtrate storage tank;
and when the liquid level of the secondary tantalum-niobium filtrate storage tank does not change any more, stopping the tantalum-niobium slurry conveying pump, the tantalum-niobium slurry stop valve, the secondary tantalum-niobium filtrate output pump and the secondary tantalum-niobium filtrate output stop valve, and cutting off the conveying of the tantalum-niobium slurry and the secondary tantalum-niobium filtrate to obtain a slurry filter cake.
8. The pressure filtration washing method for tantalum-niobium slurry decomposition liquid as claimed in claim 6, wherein the shutdown of external drainage transportation is controlled by the liquid level of slag slurry washing water and the pressure of high-pressure water, and the method specifically comprises the following steps:
automatically starting a slag slurry washing water delivery pump, a slag slurry washing water cut-off valve and an external drainage cut-off valve, delivering the slag slurry washing water to a slag slurry filter press to wash a slag slurry filter cake, and outputting external drainage water;
when the liquid level of the slag slurry washing water reaches a preset liquid level, the slag slurry washing water conveying pump and the slag slurry washing water cut-off valve are closed, and the conveying of the slag slurry washing water is cut off to obtain a washed slag slurry filter cake;
automatically starting a high-pressure water delivery pump and a high-pressure water cut-off valve, delivering high-pressure water to a slurry filter press, and squeezing residual discharged water in a washed slurry filter cake;
and when the pressure of the high-pressure water is equal to the lift of the high-pressure water delivery pump, shutting down the high-pressure water delivery pump, the high-pressure water cut-off valve and the external drainage cut-off valve, and cutting off the delivery of the high-pressure water and the external drainage to obtain the low-water-content slag slurry filter cake.
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