CN112575202A - Method for purifying nickel-cobalt solution and recovering iron - Google Patents
Method for purifying nickel-cobalt solution and recovering iron Download PDFInfo
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- CN112575202A CN112575202A CN202011282062.8A CN202011282062A CN112575202A CN 112575202 A CN112575202 A CN 112575202A CN 202011282062 A CN202011282062 A CN 202011282062A CN 112575202 A CN112575202 A CN 112575202A
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- iron
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
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- 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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- Mechanical Engineering (AREA)
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- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a method for purifying a nickel-cobalt solution and recovering iron, which comprises the following steps: (1) adding a deironing agent into the nickel-cobalt solution to obtain iron slag and a purified nickel-cobalt solution; the iron removing agent is one of sodium phosphate, sodium dihydrogen phosphate, sodium hydrogen phosphate, potassium dihydrogen phosphate and potassium hydrogen phosphate; the addition amount of the iron remover is 0.8-1.0 time of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution. (2) Adding sodium hydroxide or potassium hydroxide serving as a regenerant into the iron slag to obtain the iron slag treated by the regenerant and an iron remover; (3) and pyrolyzing the iron slag treated by the regenerant at 300-600 ℃ to obtain the iron-containing oxide. The iron removing agent can be used repeatedly, the iron slag contains low-value metal, and the purposes of purifying the nickel-cobalt solution in a short process, eliminating iron slag pile and realizing comprehensive utilization can be realized.
Description
Technical Field
The invention belongs to the field of non-ferrous metallurgy, and particularly relates to a method for purifying a nickel-cobalt solution and recovering iron.
Background
At present, iron removal methods of nickel-cobalt solutions at home and abroad mainly comprise neutralization precipitation iron removal, goethite iron removal, sodium iron vanadium iron removal and extraction method iron removal. The iron slag with different slag types can be formed by three iron removing methods of neutralization precipitation iron removal, goethite iron removal and sodium iron vanadium iron removal, and the slag amount is different. The iron slag generated by the neutralization precipitation iron removal method has low iron content and the maximum slag content; the ferro-goethite iron-removing method generates the least amount of iron slag. The iron removal method has the advantages of high energy consumption, large wastewater discharge, long flow path and high iron removal cost. Meanwhile, the iron slag obtained by removing iron exists in the forms of ferric hydroxide, yellow sodium iron vanadium and the like, and all the iron slag adopt a stacking mode, so that a large amount of land is occupied, and a certain influence is caused on the ecological environment.
Disclosure of Invention
The invention aims to provide a method for purifying and recycling iron from a nickel-cobalt solution, which is easy to control the process, simple to operate, good in iron slag filtering performance, low in slag valuable metal content, high in metal recovery rate, capable of comprehensively utilizing iron slag and good in application prospect, aiming at the defects in the iron removing process of the nickel-cobalt solution and the iron slag processing technology.
The purpose of the invention is realized by the following technical scheme:
a method of purifying a nickel cobalt solution and recovering iron, the method comprising the steps of:
(1) adding a deironing agent into the nickel-cobalt solution to react for 2-4 h to obtain iron slag and purified nickel-cobalt solution; the iron remover is sodium phosphate or potassium phosphate; the addition amount of the iron remover is 0.8-1.0 time of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution;
(2) adding sodium hydroxide or potassium hydroxide serving as a regenerant into the iron slag to obtain the iron slag treated by the regenerant and an iron remover; the addition amount of the regenerant is 0.8-1.2 times of the mass of the iron slag;
(3) and pyrolyzing the iron slag treated by the regenerant at 300-600 ℃ to obtain the iron-containing oxide.
The method for purifying and recovering iron from the nickel-cobalt solution is characterized in that the pH value of the nickel-cobalt solution in the step (1) is 1.8-3.0; the nickel cobalt solution comprises the following components in concentration: 1.00-10.00 g/L of nickel, 30.00-65.00 g/L, Fe 1.00.00-10.00 g/L of cobalt and less than or equal to 2.50g/L of calcium.
The method for purifying and recovering iron from the nickel-cobalt solution is characterized in that the iron removing agent in the step (2) is returned to the nickel-cobalt solution in the step (1).
The method for purifying and recovering iron from the nickel-cobalt solution is characterized in that the iron-containing oxide obtained in the step (3) is used for producing nickel-containing pig iron at 1450-1600 ℃.
The invention has the beneficial technical effects that: the invention adopts a chemical precipitation method to purify the nickel-cobalt solution and comprehensively recover iron, the iron removing agent can be repeatedly used, the iron slag contains low-value metal, and the purposes of purifying the nickel-cobalt solution in a short process, eliminating iron slag stockpiling and producing nickel-containing pig iron and realizing comprehensive utilization can be realized. The method has the advantages of low iron removal temperature, simple and easily-controlled operation, easy filtration of the iron slag, low valuable metal content in the slag, high metal recovery rate, recyclable iron remover, no iron slag pile, availability of iron-containing materials and the like, and has better application prospect.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
Referring to fig. 1, the method for purifying and recovering iron from a nickel-cobalt solution of the invention comprises the following steps:
(1) purifying the nickel-cobalt solution at normal temperature for removing iron: adding a deironing agent into the nickel-cobalt solution at normal temperature to react for 2-4 h, reacting the deironing agent with iron ions in the nickel-cobalt solution to generate iron insoluble substances, and carrying out solid-liquid separation to obtain iron slag and a purified nickel-cobalt solution; the iron removing agent is sodium phosphate or potassium phosphate, preferably any one of sodium phosphate, sodium dihydrogen phosphate, sodium monohydrogen phosphate, potassium dihydrogen phosphate and potassium monohydrogen phosphate. The addition amount of the iron remover is 0.8-1.0 time of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution. The pH value of the nickel-cobalt solution is 1.8-3.0; the nickel cobalt solution comprises the following components in concentration: 1.00-10.00 g/L of nickel, 30.00-65.00 g/L, Fe 1.00.00-10.00 g/L of cobalt and less than or equal to 2.50g/L of calcium. The removal rate of iron in the purified nickel-cobalt solution is 97 percent or more.
(2) Regeneration of the iron removing agent: adding sodium hydroxide or potassium hydroxide serving as a regenerant into the iron slag to obtain the iron slag treated by the regenerant and an iron remover; the adding amount of the regenerant is 0.8-1.2 times of the mass of the iron slag, and the iron removing agent returns to the nickel-cobalt solution in the step (1) for continuous use.
(3) Iron slag pyrolysis and comprehensive utilization of iron-containing materials: and pyrolyzing the iron slag treated by the regenerant at 300-600 ℃ to obtain the iron-containing oxide. The iron-containing oxide, steel mill dust and nickel-containing slag are proportioned to produce nickel-containing pig iron at 1450-1600 ℃.
Example 1
The nickel cobalt solution comprises the following components in concentration: 1.97g/L of nickel, 59.53g/L of cobalt, 3.46g/L of Fe3, 0.18g/L of calcium, and controlling the pH value of the nickel-cobalt solution to be 1.8. Adding an iron removing agent into the nickel-cobalt solution at normal temperature for reaction for 3h, carrying out solid-liquid separation to obtain iron slag and a purified nickel-cobalt solution, wherein the purified nickel-cobalt solution contains 0.08g/L of iron, the removal rate of the iron is 97.22%, and the purified nickel-cobalt solution is sent to a nickel-cobalt separation system. The nickel and cobalt content in the iron slag is lower than 0.01 percent, and the iron slag is sent to a de-ironing agent regeneration system. The iron remover is sodium dihydrogen phosphate; the addition amount of the iron remover is 0.8 times of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution.
Example 2
The nickel cobalt solution comprises the following components in concentration: 1.95g/L of nickel, 59.75g/L of cobalt, 3.42g/L of Fe3, 0.16g/L of calcium, and controlling the pH value of the nickel-cobalt solution to be 2.5. Adding an iron removing agent into the nickel-cobalt solution at normal temperature for reaction for 3h, carrying out solid-liquid separation to obtain iron slag and a purified nickel-cobalt solution, wherein the purified nickel-cobalt solution contains 0.008g/L of iron, the removal rate of the iron is 99.96%, and the purified nickel-cobalt solution is sent to a nickel-cobalt separation system. The nickel and cobalt content in the iron slag is lower than 0.02 percent, and the iron slag is sent to a de-ironing agent regeneration system. The iron remover is sodium phosphate; the addition amount of the iron remover is 1.0 time of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution.
Example 3
The nickel cobalt solution comprises the following components in concentration: 1.98g/L of nickel, 59.31g/L of cobalt, 3.50g/L of Fe3.50g/L and 0.19g/L of calcium, and controlling the pH value of the nickel-cobalt solution to be 3.0. Adding an iron removing agent into the nickel-cobalt solution at normal temperature for reaction for 3h, carrying out solid-liquid separation to obtain iron slag and a purified nickel-cobalt solution, wherein the purified nickel-cobalt solution contains 0.01g/L of iron, the removal rate of the iron is 99.62%, and the purified nickel-cobalt solution is sent to a nickel-cobalt separation system. The nickel and cobalt content in the iron slag is lower than 0.02 percent, and the iron slag is sent to a de-ironing agent regeneration system. The iron remover is potassium phosphate; the addition amount of the iron remover is 0.9 times of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution.
Claims (4)
1. A method of purifying a nickel cobalt solution and recovering iron, the method comprising the steps of:
(1) adding a deironing agent into the nickel-cobalt solution to react for 2-4 h to obtain iron slag and purified nickel-cobalt solution; the iron remover is sodium phosphate or potassium phosphate; the addition amount of the iron remover is 0.8-1.0 time of the theoretical calculation amount of the iron remover required for removing iron in the nickel-cobalt solution;
(2) adding sodium hydroxide or potassium hydroxide serving as a regenerant into the iron slag to obtain the iron slag treated by the regenerant and an iron remover; the addition amount of the regenerant is 0.8-1.2 times of the mass of the iron slag;
(3) and pyrolyzing the iron slag treated by the regenerant at 300-600 ℃ to obtain the iron-containing oxide.
2. The method for purifying a nickel cobalt solution and recovering iron as claimed in claim 1, wherein the pH of the nickel cobalt solution in the step (1) is 1.8 to 3.0; the nickel cobalt solution comprises the following components in concentration: 1.00-10.00 g/L of nickel, 30.00-65.00 g/L, Fe 1.00.00-10.00 g/L of cobalt and less than or equal to 2.50g/L of calcium.
3. The method for purifying a nickel cobalt solution and recovering iron as claimed in claim 1 wherein the iron remover in step (2) is returned to the nickel cobalt solution in step (1).
4. The method for purifying and recovering iron from a nickel-cobalt solution according to claim 1, characterized in that the iron-containing oxide obtained in step (3) is used to produce nickel-containing pig iron at 1450 ℃ to 1600 ℃.
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| CN202011282062.8A CN112575202A (en) | 2020-11-17 | 2020-11-17 | Method for purifying nickel-cobalt solution and recovering iron |
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