CN115747478A - Method for realizing gas recycling in cobalt production process - Google Patents
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Abstract
The invention relates to a method for realizing gas recycling in a cobalt production process, and belongs to the technical field of cobalt production. Preparing tailings and a mixed solution A by sulfating roasting leaching after flotation of the pyrite containing cobalt, extracting the mixed solution A through P204 and P507 in sequence to obtain a cobalt chloride solution, electrolytically depositing cobalt by using part of cobalt chloride, and calcining the precipitated cobalt carbonate by using the other part of cobalt chloride to prepare cobalt powder; the heat of the calcined gas is used for heating water immersion, and sulfur dioxide in the gas and reduction leaching are used for preparing sulfuric acid; heating ammonium chloride crystals by using the calcination heat of the cobalt carbonate to generate ammonia gas, hydrogen chloride and water vapor, preparing sulfuric acid by using the water vapor, using solvent water for reuse water in the water leaching step, using the ammonia gas for saponification of a poor organic phase and preparing ammonium bicarbonate by using the ammonia gas and carbon dioxide generated by calcination, and using the hydrogen chloride for back extraction of a cobalt-containing organic phase; hydrogen generated by electrolysis is used for reduction during cobalt carbonate calcination; the whole process fully utilizes gas heat energy, and partial byproducts are returned to the process for utilization, thereby saving energy and protecting environment.
Description
Technical Field
The invention belongs to the technical field of cobalt production, and relates to a method for realizing gas recycling in a cobalt production process.
Background
Cobalt is an important strategic resource, plays an important role in the high-tech fields such as national defense, lithium batteries and the like, and has a continuously increased value with the rise of new energy automobiles in recent years, so that the development of the cobalt resource has a higher economic value, and people need to vigorously research and develop the process of low-grade cobalt-containing ores with the increasing exhaustion of the cobalt resource. Cobalt ore exists alone rarely in nature, mainly accompanies nickel ore, copper ore, pyrite and arsenic deposit, and has less content and relatively difficult extraction, cobalt ore resources mainly comprise four types of nickel-cobalt sulfide ore and oxide ore, copper-cobalt ore, arsenic-cobalt ore and cobalt-containing pyrite, and cobalt smelting characteristics are represented by low raw material grade, long extraction flow and more extraction methods.
The traditional process for extracting cobalt from the cobalt-containing pyrite comprises the following steps: the method comprises the steps of preparing cobalt-sulfur concentrate from pyrite containing cobalt through flotation, carrying out sulfating roasting on the cobalt-sulfur concentrate to convert valuable elements such as cobalt, nickel and copper in the cobalt-sulfur concentrate into soluble sulfate, and leaching the roasted product with water or acid to convert the cobalt, nickel and copper into a solution. The leachate is purified to remove impurities such as copper, zinc and the like, and then the pure cobalt solution is obtained through nickel-cobalt separation, and the metal cobalt is produced through electrodeposition. However, in the traditional process, a large amount of heat in steam generated by roasting is not fully utilized, so that waste is caused, a large amount of electric energy is consumed for preparing cobalt by an electrodeposition method, meanwhile, chlorine generated in the cobalt preparation process by the electrodeposition method is also a problem to be solved, and a large amount of waste liquid is generated in the purification step of leachate, so that the problem of environmental pollution is caused. Therefore, research and improvement of the process for preparing cobalt from the pyrite containing cobalt can fully utilize steam and heat energy generated in the process, promote the whole process to reduce external emission, save energy and protect environment, and is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for realizing gas recycling in a cobalt production process, and belongs to the technical field of cobalt production. The method comprises the steps of carrying out sulfating roasting leaching on the floated pyrite containing cobalt to prepare tailings containing ferric oxide and a mixed solution A, wherein the mixed solution A is subjected to P204 extraction and P507 extraction to obtain a cobalt chloride solution, one part of the cobalt chloride solution is electrolyzed and deposited to prepare cobalt, and the other part of the cobalt chloride solution is used for precipitating cobalt carbonate and is further calcined in a hydrogen atmosphere to prepare cobalt powder; heating the water leaching treatment step by utilizing the heat of gas generated by calcining the pyrite containing cobalt, preparing sulfuric acid by utilizing sulfur trioxide, sulfur dioxide and water vapor in the gas and preparing the sulfuric acid by reducing water leaching, and returning the sulfuric acid to the process for use; heating ammonium chloride crystals by using the heat of cobalt carbonate calcination to generate ammonia gas, hydrogen chloride and water vapor, wherein the water vapor is used for preparing sulfuric acid, the ammonia gas is used for saponifying a lean organic phase and preparing ammonium bicarbonate with carbon dioxide generated by cobalt carbonate calcination, the hydrogen chloride is used for back extraction of a cobalt-containing organic phase, and solvent water in an ammonium chloride solution is used as reuse water in a water leaching step; hydrogen generated in the electrolytic process is used for reducing the cobalt carbonate calcination; the whole process fully utilizes the heat energy of the gas, and meanwhile, part of byproducts are returned to the process for utilization, so that the energy is saved and the environment is protected.
The purpose of the invention can be realized by the following technical scheme:
a method for realizing gas recycling in a cobalt production process comprises the following steps:
(1) Preparing cobalt-sulfur concentrate from the cobalt-containing pyrite through flotation, uniformly mixing the cobalt-sulfur concentrate and a sulfuric acid solution, placing the mixture into a roasting furnace for roasting, and producing roasted sand, smoke dust and gas containing sulfur dioxide, sulfur trioxide and water vapor after roasting;
(2) Discharging the calcine, adding reuse water for water leaching treatment, and filtering to obtain tailings mainly containing ferric oxide and a mixed solution A containing cobalt sulfate, nickel sulfate, copper sulfate and zinc sulfate;
(3) Extracting the mixed solution A by P204 extraction equipment to obtain a mixed solution B containing cobalt sulfate and nickel sulfate and a loaded organic phase 1 containing copper ions, zinc ions and the like;
(4) Adding a sulfuric acid solution into the loaded organic phase 1 to wash cobalt to obtain a mixed solution C containing a small amount of cobalt sulfate and nickel sulfate and a loaded organic phase 2 containing copper ions, zinc ions and the like, adding sulfuric acid into the loaded organic phase 2 to perform back extraction to obtain a mixed solution D containing copper sulfate and zinc sulfate and a poor organic phase 1, wherein the mixed solution D is used for recovering copper and zinc, and the poor organic phase 1 is continuously used for extraction in a P204 extraction device after being saponified by adding alkali;
(5) Extracting the mixed solution B obtained in the step (3) and the mixed solution C obtained in the step (4) by P507 extraction equipment to obtain a cobalt-containing organic phase and a raffinate containing nickel sulfate, wherein the raffinate is used for recovering nickel;
(6) Adding a hydrochloric acid solution into the cobalt-containing organic phase for back extraction to obtain a cobalt chloride solution and a lean organic phase 2, adding alkali into the lean organic phase 2 for saponification, and then continuously using the lean organic phase in P507 extraction equipment for extraction;
(7) Preparing cobalt from a part of cobalt chloride solution by an electrolytic deposition method, and simultaneously generating chlorine and a small amount of by-product hydrogen;
(8) And adding the other part of the cobalt chloride solution into an ammonium bicarbonate solution to prepare precipitated cobalt carbonate, simultaneously generating an ammonium chloride solution, filtering, putting the cobalt carbonate into a calcining furnace, and calcining in a hydrogen atmosphere to prepare cobalt powder.
The contents of main elements in the cobalt-sulfur concentrate obtained by flotation of the cobalt-containing pyrite are shown in the following table 1:
TABLE 1 content of main elements in cobalt-sulfur concentrate
| Serial number | Element(s) | Content (%) |
| 1 | Co | 0.628 |
| 2 | Ni | 0.059 |
| 3 | Cu | 0.921 |
| 4 | Fe | 31.947 |
| 5 | S | 33.452 |
| 6 | Zn | 0.024 |
| 7 | H 2 O | 0.352 |
As a preferable technical scheme of the invention, the roasting temperature in the step (1) is 610-630 ℃, and the roasting time is 2-4h. After roasting at the optimized temperature and time, the iron element in the cobalt-sulfur concentrate is converted into ferric oxide, the sulfur element is oxidized into sulfur dioxide and sulfur trioxide to enter smoke dust and gas, and the water in the cobalt-sulfur concentrate is converted into water vapor to enter the gas.
As a preferable technical scheme of the invention, the temperature of the water leaching treatment in the step (2) is 70-90 ℃, the water leaching treatment time is 4-6h, the liquid-solid ratio of the water leaching treatment is 2-4. And (3) leaching the roasted calcine by water to obtain tailings and a mixed solution A, wherein ferric oxide enters the tailings, and the mixed solution A contains cobalt ions, nickel ions, copper ions, zinc ions and the like.
As a preferable technical scheme of the invention, the current density of the electrolytic deposition method in the step (7) is 300-400A/m 2 The cell voltage is 2-3V.
As a preferable technical scheme of the invention, the calcining temperature of the cobalt carbonate in the step (8) in a hydrogen atmosphere is 400-600 ℃, and the calcining time is 3-5h.
As a preferred technical scheme of the invention, a heat exchanger 1 is arranged outside the roasting furnace in the step (1), high-temperature smoke dust and gas generated in the roasting process are replaced by low-temperature smoke dust and gas, the low-temperature smoke dust and gas comprise smoke dust, sulfur trioxide, sulfur dioxide and water vapor, the smoke dust is collected by cyclone, cloth bag and electric dust collection, and the sulfur trioxide, sulfur dioxide are subjected to catalytic oxidation and the water vapor is used for preparing sulfuric acid; and (3) replacing the low-temperature reuse water with high-temperature reuse water by the heat exchanger 1 for water leaching treatment in the step (2), wherein the water leaching treatment is carried out in a reaction kettle with a coil pipe device.
As a preferred technical scheme of the invention, the sulfuric acid prepared from sulfur trioxide, sulfur dioxide and water vapor is purified and then used for washing cobalt in the loaded organic phase 1 and back extraction of the loaded organic phase 2 in the step (4) and roasting in the step (1).
As a preferable technical scheme of the invention, chlorine generated in the electrolytic deposition process in the step (7) is collected and used for leaching, oxidizing and removing impurities.
As a preferable technical scheme of the invention, the byproduct hydrogen in the step (7) is collected and then used for calcining the cobalt carbonate in the step (8) to prepare cobalt powder.
As a preferable technical scheme of the invention, a heat exchanger 2 is arranged outside the calcining furnace in the step (8), the high-temperature carbon dioxide gas generated after the cobalt carbonate calcination is replaced by the low-temperature carbon dioxide gas through a heat exchanger 2, the low-temperature ammonium chloride solution is replaced by the high-temperature ammonium chloride solution through the heat exchanger 2, ammonium chloride crystals are promoted to decompose to generate ammonia gas, hydrogen chloride and water vapor, the water vapor is used for preparing sulfuric acid, the ammonia gas is used for the alkali-adding saponification of the organic-poor phase 1 in the step (4) and the alkali-adding saponification of the organic-poor phase 2 in the step (6) and is used for preparing ammonium bicarbonate with the carbon dioxide generated by the cobalt carbonate calcination, the hydrogen chloride is dissolved in water to prepare a hydrochloric acid solution for the back extraction of the cobalt-containing organic phase in the step (6), and the solvent water in the ammonium chloride solution is used for the reuse water in the water leaching step.
The invention has the beneficial effects that:
(1) The invention replaces the high-temperature smoke dust and gas generated in the roasting process into low-temperature smoke dust and gas through the heat exchanger 1, the heat of the low-temperature smoke dust and gas is used for replacing low-temperature reuse water into high-temperature reuse water for water immersion treatment in the step (2), the heat generated in the roasting process is fully utilized, and meanwhile, the stability of the temperature in the roasting furnace is controlled;
(2) The method purifies sulfuric acid prepared from sulfur trioxide, sulfur dioxide and water vapor generated in the roasting process, and then the sulfuric acid is used for cobalt washing of the loaded organic phase 1 and back extraction of the loaded organic phase 2 in the step (4) and roasting in the step (1), so that the outward emission of harmful gas is prevented, and meanwhile, raw materials are saved for subsequent cobalt washing, back extraction and front-end roasting steps, and the method is energy-saving and environment-friendly;
(3) Chlorine generated in the electrolytic deposition process is collected and then used for leaching, oxidizing and removing impurities, so that the emission of harmful gas is reduced, hydrogen chloride is generated in the decomposition process of ammonium chloride crystals, and the hydrogen chloride is dissolved in water to prepare a hydrochloric acid solution for back extraction of the cobalt-containing organic phase in the step (6), so that the emission of waste liquid is reduced, and meanwhile, a raw material is provided for the subsequent back extraction process;
(4) Ammonia gas generated by decomposing the ammonium chloride crystals is used for alkali saponification of the poor organic phase 1 in the step (4), alkali saponification of the poor organic phase 2 in the step (6) and preparation of ammonium bicarbonate with carbon dioxide generated by calcining cobalt carbonate, and is recycled in the process, so that waste liquid discharge is reduced, and meanwhile, saponification regeneration of the poor organic phase of the subsequent P204 extraction and the poor organic phase of the P507 extraction is promoted;
(5) The invention uses the water vapor generated in the water leaching step and the water vapor generated by decomposing the ammonium chloride crystal to prepare the sulfuric acid, and the sulfuric acid is purified and reused in the process; the solvent water in the ammonium chloride solution is used as reuse water in the water leaching step, so that water waste is avoided, and water resources are saved;
(6) According to the invention, the heat of the carbon dioxide gas generated in the cobalt carbonate calcining process is replaced by the heat exchanger 2, and the heat is used for preparing ammonia gas and hydrogen chloride by decomposing ammonium chloride crystals, so that the heat is recycled, and the energy-saving and environment-friendly effects are achieved.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be provided in conjunction with the embodiments.
Example 1
A method for realizing gas recycling in a cobalt production process comprises the following steps:
(1) Preparing cobalt-sulfur concentrate from cobalt-containing pyrite through flotation, uniformly mixing the cobalt-sulfur concentrate and a sulfuric acid solution, placing the mixture in a roasting furnace, roasting at 620 ℃ for 3 hours, producing roasted sand and smoke dust and gas containing sulfur dioxide, sulfur trioxide and water vapor after roasting, converting iron elements in the cobalt-sulfur concentrate into ferric oxide, oxidizing the sulfur elements into sulfur trioxide and sulfur dioxide, enabling the sulfur trioxide and the sulfur dioxide to enter the smoke dust and gas, and converting water in the cobalt-sulfur concentrate into water vapor and enabling the water vapor to enter the gas;
(2) Adding reuse water into the discharged calcine, carrying out water leaching treatment for 5 hours at the temperature of 80 ℃, wherein the water leaching treatment is carried out in a reaction kettle with a coil pipe device, the solid-to-liquid ratio of the water leaching is controlled to be 3; arranging a heat exchanger 1 outside the roasting furnace, replacing high-temperature smoke dust and gas generated in the roasting process with low-temperature smoke dust and gas, wherein the low-temperature smoke dust and gas comprise smoke dust, sulfur trioxide, sulfur dioxide and water vapor, collecting the smoke dust through cyclone, cloth bag and electric dust collection, and catalytically oxidizing the sulfur trioxide and the sulfur dioxide and using the water vapor to prepare sulfuric acid; replacing low-temperature reuse water with high-temperature reuse water by the heat exchanger 1 for water leaching treatment in the step (2); purifying sulfuric acid prepared from sulfur trioxide, sulfur dioxide and water vapor, and then using the purified sulfuric acid in the step (4) to wash cobalt in the loaded organic phase 1 and the loaded organic phase 2 for back extraction and roasting in the step (1);
(3) Extracting the mixed solution A by P204 extraction equipment to obtain a mixed solution B containing cobalt sulfate and nickel sulfate and a loaded organic phase 1 containing copper ions, zinc ions and the like;
(4) Adding a sulfuric acid solution into the loaded organic phase 1 to wash cobalt to obtain a mixed solution C containing a small amount of cobalt sulfate and nickel sulfate and a loaded organic phase 2 containing copper ions, zinc ions and the like, adding sulfuric acid into the loaded organic phase 2 to perform back extraction to obtain a mixed solution D containing copper sulfate and zinc sulfate and a lean organic phase 1, wherein the mixed solution D is used for recovering copper and zinc, and the lean organic phase 1 is continuously used for extraction in a P204 extraction device after being saponified by adding alkali;
(5) Extracting the mixed solution B obtained in the step (3) and the mixed solution C obtained in the step (4) by P507 extraction equipment to obtain a cobalt-containing organic phase and a raffinate containing nickel sulfate, wherein the raffinate is used for recovering nickel;
(6) Adding a hydrochloric acid solution into the cobalt-containing organic phase for back extraction to obtain a cobalt chloride solution and a lean organic phase 2, adding alkali into the lean organic phase 2 for saponification, and then continuously using a P507 extraction device for extraction;
(7) Preparing cobalt from 78% cobalt chloride solution by electrolytic deposition method with current density of 350A/m 2 The cell voltage is 3V, chlorine and a small amount of by-product hydrogen are generated simultaneously, and the chlorine is collected and used for leaching, oxidizing and removing impurities; after being collected, the hydrogen is used for calcining the cobalt carbonate in the step (8) to prepare cobalt powder;
(8) Adding 22% cobalt chloride solution into ammonium bicarbonate solution and nucleating agent to prepare precipitated cobalt carbonate, simultaneously generating ammonium chloride solution, filtering, putting the cobalt carbonate into a calcining furnace, and calcining at 500 ℃ for 4h in hydrogen atmosphere to prepare cobalt powder; a heat exchanger 2 is arranged outside the calcining furnace, high-temperature carbon dioxide gas generated after the cobalt carbonate is calcined is replaced by low-temperature carbon dioxide gas through a heat exchanger 2, a catalyst is added into the low-temperature ammonium chloride solution, the low-temperature ammonium chloride solution is replaced by high-temperature ammonium chloride solution through the heat exchanger 2, ammonium chloride crystals are promoted to be decomposed to generate ammonia gas, hydrogen chloride and water vapor, the ammonia gas is used for alkali saponification of the poor organic phase 1 in the step (4), alkali saponification of the poor organic phase 2 in the step (6) and preparation of ammonium bicarbonate through the carbon dioxide generated by calcining the cobalt carbonate, the hydrogen chloride is dissolved in water to prepare hydrochloric acid solution, the hydrochloric acid solution is used for back extraction of the cobalt-containing organic phase in the step (6), the water vapor is used for preparing sulfuric acid, and the solvent water in the ammonium chloride solution is used for reuse water in the water leaching step.
The total investment of the project implementation of the embodiment is 50 ten thousand yuan, and the total investment is calculated through actual test operationThe water vapor in the cobalt-sulfur concentrate can be used for 326.47t; water can be saved by 7412.3t every year, sulfur dioxide is produced by 8975.35t every year in the roasting stage of the cobalt-sulfur concentrate, and the utilization rate of the sulfur dioxide reaches 98.5 percent; 684.21t of chlorine gas is annually produced in the cobalt stage prepared by an electrolytic deposition method, and the utilization rate of the chlorine gas reaches 99.1 percent; 38.7t of hydrogen produced annually in the cobalt stage prepared by the electrolytic deposition method, wherein the utilization rate of the hydrogen reaches 99.6 percent; ammonia gas is produced for 158.23t every year in the cobalt carbonate precipitation stage, and the utilization rate of the ammonia gas reaches 99.5 percent; the annual production of 335.08t of hydrogen chloride in the cobalt carbonate precipitation stage reaches the utilization rate of 99.8 percent; the annual production of carbon dioxide at 267.28t in the cobalt carbonate calcining stage reaches the utilization rate of 95.2 percent; through the arrangement of the heat exchanger 1 and the heat exchanger 2, the annual energy consumption is saved by 3.152 multiplied by 10 10 kJ; the yield of the cobalt reaches 94.58 percent, and the purity of the cobalt reaches 99.55 percent.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for realizing gas recycling in a cobalt production process is characterized by comprising the following steps:
(1) Preparing cobalt-sulfur concentrate from the cobalt-containing pyrite through flotation, uniformly mixing the cobalt-sulfur concentrate and a sulfuric acid solution, placing the mixture into a roasting furnace for roasting, and producing roasted sand, smoke dust and gas containing sulfur dioxide, sulfur trioxide and water vapor after roasting;
(2) Discharging the calcine, adding reuse water for water leaching treatment, and filtering to obtain tailings mainly containing ferric oxide and a mixed solution A containing cobalt sulfate, nickel sulfate, copper sulfate and zinc sulfate;
(3) Extracting the mixed solution A by P204 extraction equipment to obtain a mixed solution B containing cobalt sulfate and nickel sulfate and a loaded organic phase 1 containing copper ions, zinc ions and the like;
(4) Adding a sulfuric acid solution into the loaded organic phase 1 to wash cobalt to obtain a mixed solution C containing cobalt sulfate and nickel sulfate and a loaded organic phase 2 containing copper ions, zinc ions and the like, adding sulfuric acid into the loaded organic phase 2 to perform back extraction to obtain a mixed solution D containing copper sulfate and zinc sulfate and a lean organic phase 1, wherein the mixed solution D is used for recovering copper and zinc, and the lean organic phase 1 is subjected to alkali saponification and then is continuously used for extraction by a P204 extraction device;
(5) Extracting the mixed solution B obtained in the step (3) and the mixed solution C obtained in the step (4) by P507 extraction equipment to obtain a cobalt-containing organic phase and a raffinate containing nickel sulfate, wherein the raffinate is used for recovering nickel;
(6) Adding a hydrochloric acid solution into the cobalt-containing organic phase for back extraction to obtain a cobalt chloride solution and a lean organic phase 2, adding alkali into the lean organic phase 2 for saponification, and then continuously using the lean organic phase in P507 extraction equipment for extraction;
(7) Preparing cobalt from part of cobalt chloride solution by an electrolytic deposition method, and simultaneously generating chlorine and a byproduct hydrogen;
(8) And adding the other part of the cobalt chloride solution into an ammonium bicarbonate solution to prepare precipitated cobalt carbonate, simultaneously generating an ammonium chloride solution, filtering, putting the cobalt carbonate into a calcining furnace, and calcining in a hydrogen atmosphere to prepare cobalt powder.
2. The method for recycling gas in the cobalt production process according to claim 1, wherein the roasting temperature in the step (1) is 610-630 ℃, and the roasting time is 2-4h.
3. The method for recycling gas in the cobalt production process according to claim 1, wherein the water leaching treatment in the step (2) is carried out at a temperature of 70-90 ℃ for 4-6h, the liquid-solid ratio of the water leaching treatment is 2-4.
4. The process of claim 1 wherein the gas is a gas of a cobalt production processThe method for recycling the body is characterized in that the current density of the electrolytic deposition method in the step (7) is 300-400A/m 2 The cell voltage is 2-3V.
5. The method for recycling gas in the cobalt production process according to claim 1, wherein the cobalt carbonate calcined in the step (8) in the hydrogen atmosphere is calcined at 400-600 ℃ for 3-5h.
6. The method for recycling gas in the cobalt production process according to claim 1, wherein in the step (1), a heat exchanger 1 is arranged outside the roasting furnace, high-temperature smoke dust and gas generated in the roasting process are replaced by low-temperature smoke dust and gas, the low-temperature smoke dust and gas comprise smoke dust, sulfur trioxide, sulfur dioxide and water vapor, the smoke dust is collected through cyclone, cloth bag and electric dust collection, the sulfur trioxide and the sulfur dioxide are subjected to catalytic oxidation, and the water vapor is used for preparing sulfuric acid; and (3) replacing the low-temperature reuse water with high-temperature reuse water by the heat exchanger 1 for water leaching treatment in the step (2), wherein the water leaching treatment is carried out in a reaction kettle with a coil pipe device.
7. The method for recycling gas generated in the cobalt production process according to claim 6, wherein the sulfuric acid prepared from sulfur trioxide, sulfur dioxide and water vapor is purified and used for cobalt washing in the loaded organic phase 1 and back extraction of the loaded organic phase 2 in the step (4) and roasting in the step (1).
8. The method for recycling gas generated in the cobalt production process according to claim 1, wherein the chlorine gas generated in the electrolytic deposition process in the step (7) is used for leaching oxidation impurity removal.
9. The method for recycling steam in the cobalt production process according to claim 1, wherein the byproduct hydrogen in the step (7) is collected and then used for preparing cobalt powder by calcining cobalt carbonate in the step (8).
10. The method for recycling steam in the cobalt production process according to claim 1, wherein a heat exchanger 2 is arranged outside the calcining furnace in the step (8), the high-temperature carbon dioxide gas generated after the cobalt carbonate is calcined is replaced by low-temperature carbon dioxide gas through the heat exchanger 2, and then the high-temperature carbon dioxide gas reacts with ammonia water to prepare ammonium bicarbonate, the low-temperature ammonium chloride solution is replaced by a high-temperature ammonium chloride solution through the heat exchanger 2 to promote the decomposition of ammonium chloride crystals to generate ammonia gas, hydrogen chloride and water vapor, the ammonia gas is used for the alkali-adding saponification of the organic-poor phase 1 in the step (4) and the alkali-adding saponification of the organic-poor phase 2 in the step (6) and the preparation of ammonium bicarbonate, the hydrogen chloride is dissolved in water to prepare a hydrochloric acid solution for the back extraction of the cobalt-containing organic phase in the step (6), the water vapor is used for preparing sulfuric acid, and the solvent water in the ammonium chloride solution is used as the recycle water in the water immersion step.
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