CN115386729A - Method for separating and recovering chromium and cobalt - Google Patents

Method for separating and recovering chromium and cobalt Download PDF

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CN115386729A
CN115386729A CN202210908252.9A CN202210908252A CN115386729A CN 115386729 A CN115386729 A CN 115386729A CN 202210908252 A CN202210908252 A CN 202210908252A CN 115386729 A CN115386729 A CN 115386729A
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chromium
solution
cobalt
hydroxide
alkali
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彭权
张代彬
张欣
傅雨
黄成龙
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Chongyi Zhangyuan Tungsten Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B23/00—Obtaining nickel or cobalt
    • C22B23/04—Obtaining nickel or cobalt by wet processes
    • C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/30—Obtaining chromium, molybdenum or tungsten
    • C22B34/32—Obtaining chromium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention discloses a method for separating and recovering chromium and cobalt, which comprises the following steps: (1) Adding the atomized first alkali solution into a chromium-cobalt solution along with ultrasonic treatment, and then carrying out solid-liquid separation to obtain chromium hydroxide and a chromium-precipitated solution; (2) And adding the second alkali solution into the solution after chromium precipitation, and then carrying out solid-liquid separation to obtain cobalt hydroxide and waste liquid. Therefore, the method can realize the high-efficiency separation of chromium and cobalt, and has high cobalt recovery rate and remarkable economic benefit.

Description

Method for separating and recovering chromium and cobalt
Technical Field
The invention belongs to the technical field of resource recycling, and particularly relates to a method for separating and recovering chromium and cobalt.
Background
Cobalt metal is an important strategic metal in the world at present, is an important raw material in the field of manufacturing lithium batteries and hard alloys, and is praised as industrial monosodium glutamate by the industry. With the rapid development of new energy industry in China, the demand for cobalt is also increased geometrically. However, because of the shortage of cobalt resources in China, a large amount of cobalt products need to be imported from foreign countries. Therefore, the resource utilization of the cobalt waste is very important. However, the cobalt waste is characterized by complex components, large content difference and different treatment processes. Therefore, in the actual production process, the problem of separation of cobalt from other impurity elements is encountered. The tungsten-cobalt thermal spraying powder is an important industrial raw material and has wide application in the fields of oil exploitation, paper making and the like. The tungsten-cobalt thermal spraying powder can generate a certain amount of spraying material waste in the production and use processes, the main components of the tungsten-cobalt thermal spraying powder are tungsten carbide, cobalt and chromium, and the tungsten-cobalt thermal spraying powder has great recycling value. In general, the cobalt is extracted by an acid leaching method in industry, but the chromium in the waste is leached together when the acid leaching is carried out, a chromium removal process by a neutralization precipitation method needs to be added, but the cobalt loss is caused when the chromium is removed, and the recovery rate of the cobalt is reduced.
Therefore, the existing method for separating and recovering chromium and cobalt needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one objective of the present invention is to provide a method for separating and recovering chromium and cobalt, which can realize efficient separation of chromium and cobalt, and has high cobalt recovery rate and significant economic benefit.
In one aspect of the invention, the invention provides a method for separating and recovering chromium and cobalt. According to an embodiment of the invention, the method comprises:
(1) Adding the atomized first alkali solution into a chromium-cobalt solution along with ultrasonic treatment, and then carrying out solid-liquid separation to obtain chromium hydroxide and a chromium-precipitated solution;
(2) And adding a second alkali solution into the chromium-precipitated liquid, and then carrying out solid-liquid separation to obtain cobalt hydroxide and waste liquid.
According to the method for separating and recovering chromium and cobalt, provided by the embodiment of the invention, along with ultrasonic treatment, the atomized first alkali solution is added into a chromium and cobalt solution, and then solid-liquid separation is carried out to obtain chromium hydroxide and a chromium-precipitated solution. Because the pH value difference of the chromium ion and cobalt ion precipitates is not large, the accurate control of the solution end point pH can be realized by adopting the atomized first alkali solution, and the simultaneous precipitation of the chromium ion and the cobalt ion in the chromium cobalt solution caused by the local over-alkalization of the chromium cobalt solution can be avoided. The chromium hydroxide can be broken by ultrasonic vibration, and the content of cobalt ions adsorbed on the chromium hydroxide is reduced. And then adding the second alkali solution into the obtained chromium-precipitated liquid, and carrying out solid-liquid separation to obtain cobalt hydroxide and waste liquid. Therefore, the method can realize the high-efficiency separation of chromium and cobalt, and has high cobalt recovery rate and remarkable economic benefit.
In addition, the method for separating and recovering chromium and cobalt according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, in step (1), the chromium cobalt solution is a hydrochloric acid leachate of high chromium tungsten-containing waste.
In some embodiments of the invention, in step (1), the chromium-cobalt solution is Co 2+ The concentration is 40-83 g/L, cr 3+ The concentration is 5-22 g/L, and the pH value is 0-1.
In some embodiments of the invention, the first and second base solutions each independently comprise at least one of a sodium hydroxide solution, an ammonium hydroxide solution, and a potassium hydroxide solution.
In some embodiments of the invention, in step (1), the concentration of the first base solution is 4 to 20wt%. Therefore, the chromium ions can be better precipitated, and the efficient separation of chromium and cobalt is realized.
In some embodiments of the invention, in step (2), the concentration of the second base solution is 20 to 50wt%. Therefore, the recovery rate of cobalt ions is improved.
In some embodiments of the invention, in step (1), the end point pH of the addition of the atomized first alkali solution to the chromium cobalt solution is between 4.5 and 5.5. Thereby, chromium and cobalt can be well separated.
In some embodiments of the invention, in step (2), the end point pH of the second alkali solution added to the post-chromizing liquor is from 10 to 13. Therefore, the method is favorable for realizing high recovery rate of cobalt ions.
In some embodiments of the invention, the method further comprises: in the step (1), before the atomized first alkali solution is added into the chromium-cobalt solution, the chromium-cobalt solution is heated to 90-99 ℃ in advance. Thereby, the chromium hydroxide precipitate is prevented from being changed into colloid, and the cobalt ion is prevented from being adsorbed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart of a method for separating and recovering chromium and cobalt according to one embodiment of the invention;
fig. 2 is a process flow diagram for separating and recovering chromium and cobalt according to one embodiment of the invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In one aspect of the invention, the invention provides a method for separating and recovering chromium and cobalt. According to an embodiment of the invention, with reference to fig. 1, the method comprises:
s100: adding the atomized first alkali solution into the chromium-cobalt solution with ultrasonic treatment, and then carrying out solid-liquid separation
In the step, the atomized first alkali solution is added into a chromium-cobalt solution along with ultrasonic treatment, and then solid-liquid separation is carried out to obtain chromium hydroxide and a solution after chromium precipitation. Specifically, the chromium-cobalt solution is placed in a water bath device, and ultrasonic vibration is started. The atomization mode of the first alkali solution is not particularly limited, for example, the first alkali solution can be atomized by a spray bottle, the chromium-cobalt solution is the hydrochloric acid leachate of the high-chromium tungsten-containing waste, and in the chromium-cobalt solution, co 2+ The concentration is 40-83 g/L, cr 3+ The concentration is 5-22 g/L, and the pH value is 0-1. The method of solid-liquid separation can be selected by those skilled in the art according to actual needs, for example, solid-liquid separation by filtration. Simultaneously a first alkali solutionThe specific type of the first base solution is not particularly limited, and for example, the first base solution includes at least one of a sodium hydroxide solution, an ammonium hydroxide solution, and a potassium hydroxide solution.
Further, the concentration of the first alkali solution is 4 to 20wt%. The inventor finds that if the concentration of the first alkali solution is too high, droplets are easily formed when the first alkali solution is atomized, so that the chromium-cobalt solution is partially over-alkaline to cause the chromium-cobalt ions to be simultaneously precipitated; if the concentration of the first alkali solution is too low, the volume of the required first alkali solution is too large, and resources are wasted.
Further, the pH value of the terminal point of the atomized first alkali solution added into the chromium-cobalt solution is 4.5-5.5. Therefore, the precipitation of chromium ions in the chromium-cobalt solution can be realized, the precipitation of cobalt ions is avoided, and the efficient separation of chromium and tungsten ions is realized.
Further, referring to fig. 2, before the atomized first alkali solution is added to the chromium-cobalt solution, the chromium-cobalt solution is heated in a water bath to 90-99 ℃. Specifically, the chromium-cobalt solution is placed in a water bath device to be heated, the temperature is raised to 90-99 ℃, then the atomized first alkali solution is added into the chromium-cobalt solution, when the end point pH value is 4.5-5.5, the temperature is kept for 10-20 min, the chromium hydroxide is prevented from being changed into colloid and then adsorbing cobalt ions, and therefore the separation efficiency of chromium and cobalt is improved.
S200: adding the second alkali solution into the solution after chromium precipitation, and then carrying out solid-liquid separation
In the step, a second alkali solution is added into the solution after chromium precipitation, and then solid-liquid separation is carried out to obtain cobalt hydroxide and waste liquid. Specifically, after the second alkali solution is added into the chromium-precipitated solution, stirring is carried out for 60min, and then solid-liquid separation is carried out, so that the obtained waste liquid is mainly sodium salt waste liquid. It is to be noted that the specific type of the second alkali solution is not particularly limited, and for example, the second alkali solution includes at least one of a sodium hydroxide solution, an ammonium hydroxide solution, and a potassium hydroxide solution. The solid-liquid separation method is the same as that described above, and is not described herein again. Further, the concentration of the second alkali solution is 20 to 50wt%. Further, the end point pH value of the second alkali solution added into the chromium-precipitated solution is 10-13. The inventors have found that if the end point pH is too high, part of the cobalt hydroxide starts to dissolve, causing cobalt loss and increasing costs; if the end point pH is too low, the cobalt ion precipitation is incomplete, reducing economic efficiency.
According to the method for separating and recovering chromium and cobalt, provided by the embodiment of the invention, a chromium-cobalt solution is heated to 90-99 ℃ along with ultrasound, then the atomized first alkali solution is added into the chromium-cobalt solution, the final pH value of the chromium-cobalt solution is adjusted to 4.5-5.5, the temperature is kept for 10-30 min, and then solid-liquid separation is carried out to obtain chromium hydroxide and a liquid after chromium precipitation. The pH value of the chromium ion and cobalt ion precipitates is not large, and the first alkali solution is atomized, so that the phenomenon that the chromium ion and the cobalt ion in the chromium-cobalt solution are precipitated simultaneously due to the fact that the chromium-cobalt solution is over-alkaline locally can be avoided; heating the chromium-cobalt solution, and preserving heat when the end point pH of the chromium-cobalt solution is 4.5-5.5, so that the chromium hydroxide can be prevented from adsorbing cobalt ions after being changed into colloid; the chromium hydroxide can be crushed by ultrasound, and the content of cobalt ions adsorbed on the chromium hydroxide is reduced. And then adding a second alkali solution into the obtained chromium precipitation solution, adjusting the end point pH value of the chromium precipitation solution to 10-13, and carrying out solid-liquid separation to obtain cobalt hydroxide and waste liquid. Therefore, the method can realize the high-efficiency separation of chromium and cobalt, and has high cobalt recovery rate and remarkable economic benefit.
The scheme of the invention will be explained with reference to the following examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
The hydrochloric acid leachate of the high-chromium tungsten-containing waste is used as a research object, and the main components and the corresponding contents are determined as follows:
composition (I) Co 2+ Cr 3+ H +
Concentration of 83g/L 22g/L 0.2mol/L
Example 1
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. Then 10wt% sodium hydroxide solution is atomized by an atomizer and added into the chromium-cobalt solution, and the pH value of the chromium-cobalt solution is adjusted to 5.0. Then heat filtering is carried out after heat preservation is carried out for 20min, and chromium hydroxide and a solution after chromium removal are obtained. The cobalt content of the chromium hydroxide was determined to be 0.87wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromization filtrate, adjusting the pH value of the dechromization filtrate to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste liquor. The determination shows that the content of chromium in the cobalt hydroxide is 0.01wt%, and the cobalt recovery rate is 99.72%.
Example 2
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. Atomizing a 10wt% sodium hydroxide solution by an atomizer, adding the atomized solution into a chromium-cobalt solution, and adjusting the pH value of the chromium-cobalt solution to 4.5. And (4) preserving the temperature for 30min, and then carrying out hot filtration to obtain chromium hydroxide and a chromium-removed solution. The cobalt content of the chromium hydroxide was determined to be 0.71wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The chromium content of the cobalt hydroxide was determined to be 0.11wt%. The cobalt recovery was 99.78%.
Example 3
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. Atomizing a 10wt% sodium hydroxide solution by an atomizer, adding the atomized solution into a chromium-cobalt solution, adjusting the pH value of the chromium-cobalt solution to 5.5, then preserving the temperature for 10min, and carrying out heat filtration to obtain chromium hydroxide and a chromium-removed solution. The cobalt content of the chromium hydroxide was determined to be 1.82wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The content of chromium in the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 99.42%.
Example 4
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. Atomizing a 10wt% sodium hydroxide solution by an atomizer, adding the atomized solution into a chromium-cobalt solution, and adjusting the pH value of the chromium-cobalt solution to 5.0. And preserving the heat for 20min, and then performing hot filtration to obtain the chromium hydroxide and the chromium-removed liquid. The cobalt content of the chromium hydroxide was determined to be 1.42wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The chromium content of the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 99.55%.
Example 5
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 95 ℃, and meanwhile, ultrasonic vibration is started. Atomizing a 10wt% sodium hydroxide solution by an atomizer, adding the atomized solution into the chromium-cobalt solution, and adjusting the pH value of the chromium-cobalt solution to 5.0. And preserving the heat for 20min, and then performing hot filtration to obtain the chromium hydroxide and the chromium-removed liquid. The cobalt content of the chromium hydroxide was determined to be 1.03wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The content of chromium in the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 99.67%.
Example 6
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. Atomizing a 15wt% sodium hydroxide solution by an atomizer, adding the atomized solution into a chromium-cobalt solution, and adjusting the pH value of the chromium-cobalt solution to 5.0. And preserving the heat for 30min, and then performing hot filtration to obtain chromium hydroxide and a chromium-removed solution. The cobalt content of the chromium hydroxide was determined to be 2.85wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The content of chromium in the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 99.08%.
Example 7
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. Atomizing a 20wt% sodium hydroxide solution by an atomizer, adding the atomized sodium hydroxide solution into the chromium-cobalt solution, and adjusting the pH value of the chromium-cobalt solution to 6.0. And (4) preserving the temperature for 20min, and then carrying out hot filtration to obtain chromium hydroxide and a chromium-removed solution. The cobalt content of the chromium hydroxide was determined to be 5.32wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The content of chromium in the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 98.23%.
Comparative example 1
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, and the temperature is raised to 99 ℃. And atomizing a 40wt% sodium hydroxide solution by an atomizer, adding the atomized solution into the chromium-cobalt solution, and adjusting the pH value of the chromium-cobalt solution to 5.0. And preserving the heat for 20min, and then performing hot filtration to obtain the chromium hydroxide and the chromium-removed liquid. The cobalt content of the chromium hydroxide was determined to be 9.72wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The chromium content of the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 96.62%.
Comparative example 2
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, the temperature is raised to 99 ℃, and meanwhile, ultrasonic vibration is started. The 10wt% sodium hydroxide solution was added dropwise to the chromium cobalt solution, and the pH of the chromium cobalt solution was adjusted to 5.0. And (4) preserving the temperature for 20min, and then carrying out hot filtration to obtain chromium hydroxide and a chromium-removed solution. The cobalt content of the chromium hydroxide was determined to be 11.56wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The chromium content of the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 95.89%.
Comparative example 3
(1) 200mL of chromium-cobalt solution is placed in a water bath for heating, and the temperature is raised to 99 ℃. The 10wt% sodium hydroxide solution was added dropwise to the chromium cobalt solution, and the pH of the chromium cobalt solution was adjusted to 5.0. And (4) preserving the temperature for 20min, and then carrying out hot filtration to obtain chromium hydroxide and a chromium-removed solution. The cobalt content of the chromium hydroxide was determined to be 24.21wt%.
(2) And (3) dropwise adding 50wt% of sodium hydroxide solution into the dechromized solution, adjusting the pH value of the dechromized solution to 12, stirring for 60min, and filtering to obtain cobalt hydroxide and sodium salt waste solution. The content of chromium in the cobalt hydroxide was determined to be 0.01wt%. The cobalt recovery was 89.96%.
Table 1 shows the results of cobalt content and cobalt recovery in chromium hydroxide obtained under different conditions in examples 1 to 7 and comparative examples 1 to 3
Figure BDA0003773119560000071
As can be seen from the results in Table 1, in examples 1-7, the cobalt content (wt%) of the separated chromium hydroxide was relatively low, and the cobalt recovery rate of the separated cobalt hydroxide was high. In comparative examples 1-3, the cobalt content (wt%) in the separated chromium hydroxide was relatively high, while the recovery rate of cobalt in the separated cobalt hydroxide was low. In conclusion, the method for separating and recovering the chromium and the cobalt can realize the high-efficiency separation of the chromium and the cobalt, and has high cobalt recovery rate and obvious economic benefit.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (9)

1. A method for separating and recovering chromium and cobalt is characterized by comprising the following steps:
(1) Adding the atomized first alkali solution into a chromium-cobalt solution along with ultrasonic treatment, and then carrying out solid-liquid separation to obtain chromium hydroxide and a chromium-precipitated solution;
(2) And adding the second alkali solution into the chromium-precipitated solution, and then carrying out solid-liquid separation to obtain cobalt hydroxide and waste liquid.
2. The method of claim 1, wherein in step (1), the chromium cobalt solution is a hydrochloric acid leachate of high chromium tungsten-containing waste.
3. The method according to claim 1 or 2, wherein in step (1), co is in the chromium-cobalt solution 2+ The concentration is 40-83 g/L, cr 3+ The concentration is 5-22 g/L, and the pH value is 0-1.
4. The method of claim 1, wherein the first and second base solutions each independently comprise at least one of a sodium hydroxide solution, an ammonium hydroxide solution, and a potassium hydroxide solution.
5. The method according to claim 1 or 4, wherein the concentration of the first alkali solution in step (1) is 4 to 20wt%.
6. The method according to claim 1 or 4, wherein the concentration of the second alkali solution in the step (2) is 20 to 50wt%.
7. The method according to claim 1, wherein in step (1), the atomized first alkali solution is added to the chromium-cobalt solution at an end point pH of 4.5 to 5.5.
8. The method according to claim 1, wherein in the step (2), the final pH value of the second alkali solution added into the post-chromizing solution is 10-13.
9. The method of claim 1, further comprising: in the step (1), before the atomized first alkali solution is added into the chromium-cobalt solution, the chromium-cobalt solution is heated to 90-99 ℃ in advance.
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