CN-121994035-A - Waste heat recycling system in cobalt extraction purification iron removal process and application thereof
Abstract
The invention discloses a waste heat recycling system in the process of cobalt extraction, purification and iron removal and application thereof, wherein the technological application process of the whole set of device is that after solution from iron removal is pumped to a waste heat exchange plate for heat exchange, heat is transferred to chilled water at the evaporation side of a heat pump unit; the temperature of chilled water at the evaporating side of the heat pump is raised by waste heat from the deironing liquid, the heat pump transfers heat to the condenser side of the heat pump through a refrigerant medium, the temperature of circulating water at the condenser side of the heat pump is raised by the temperature from the evaporating side of the heat pump and the heat of a compressor of the heat pump, and the cobalt raw material leaching liquid is heated by the circulating water at the condenser side of the heat pump through heat supply plate heat exchange. The liquid after iron removal is taken away because of heat, the temperature is reduced, and the liquid after iron removal is recycled to the heating of the cobalt raw material solution through the process, so that the processing cost of cobalt extraction is reduced.
Inventors
- CHEN RUISHAN
- Jin Jitang
- QIN GUOXUAN
- ZHENG GUOJUN
- YANG XIAOXIA
- Gao Haiyin
- ZHOU LINHUA
- LU XIAOFANG
- LIU BAINIAN
- AI LING
- LI XIAOPENG
- WANG GUOCHAO
Assignees
- 金川集团镍钴股份有限公司
- 兰州金川新材料科技股份有限公司
Dates
- Publication Date
- 20260508
- Application Date
- 20260212
Claims (4)
- 1. The waste heat recycling system in the cobalt extraction purification iron removal process comprises a plurality of iron removal tanks and is characterized in that the iron removal tanks are connected with a heat supply plate type heat exchanger, a second heat supply plate type heat exchanger water outlet is connected with a heat pump unit, the heat pump unit comprises a condenser and an evaporator, a heat pump unit evaporator water outlet is connected with a second heat supply heat exchanger water inlet, a heat pump unit condenser water outlet is connected with a waste heat plate type heat exchanger, a first waste heat plate type heat exchanger water outlet is connected with a heat pump unit condenser water inlet, and a second waste heat plate type heat exchanger water outlet is connected with the iron removal tanks.
- 2. The waste heat recycling system in the cobalt extraction purification iron removal process of claim 1 is characterized in that the heat pump unit is connected with an expansion water tank.
- 3. The waste heat recycling system in the cobalt extraction purification iron removal process of claim 1 is characterized in that a first heat supply plate heat exchanger water inlet and a second waste heat plate heat exchanger water inlet are connected with a plate exchange backwash hydrochloric acid solution tank.
- 4. The method is characterized by further comprising the application of a waste heat recycling system in the cobalt extraction purification iron removal process, and the method is characterized by comprising the following steps of: Firstly, enabling the dissolution liquid to enter a waste heat exchanger through a water inlet II of the waste heat plate heat exchanger to perform heat exchange and temperature rise, and discharging the dissolution liquid out of the waste heat plate heat exchanger through a water outlet II of the waste heat plate heat exchanger after the temperature of the dissolution liquid rises, and enabling the dissolution liquid to enter a plurality of iron removal tanks to perform iron removal; Step two, the liquid after iron removal generated in the step one enters the heat supply plate heat exchanger through the water inlet of the heat supply plate heat exchanger for heat exchange and temperature reduction, the liquid after iron removal is discharged out of the heat supply plate heat exchanger through the water outlet of the heat supply plate heat exchanger after the temperature of the liquid after iron removal is reduced, and the liquid after iron removal enters an extraction procedure; Step three, chilled water in the evaporator of the heat pump unit enters the heat supply plate heat exchanger through the water inlet of the heat supply plate heat exchanger II, the chilled water exchanges heat and heats up in the heat supply plate heat exchanger through the heat provided in the absorption step two, the warmed chilled water is discharged out of the heat supply plate heat exchanger through the water inlet and outlet of the heat supply plate heat exchanger II, and the chilled water enters the evaporator of the heat pump unit again; step four, the heat absorbed by the evaporator of the heat pump unit in the step three is transferred to the condenser of the heat pump unit through the heat pump refrigerant and the compressor, and the temperature of the circulating water of the condenser of the heat pump unit is increased; And fifthly, circulating water of the condenser of the heat pump unit heated in the step four enters the waste heat plate heat exchanger through the water inlet of the waste heat plate heat exchanger to exchange heat, heat is provided for the solution in the step one, and cooled circulating water enters the condenser of the heat pump unit again.
Description
Waste heat recycling system in cobalt extraction purification iron removal process and application thereof Technical Field The invention belongs to the technical field of nonferrous hydrometallurgy processes, and particularly relates to a waste heat recycling system in a cobalt extraction purification iron removal process and application thereof. Background The cobalt extraction iron removal process is to add an oxidant and a neutralizer into the solution after dissolution respectively, control the temperature (80-90 ℃) and the pH value in the reaction process, filter-press the solution after iron removal, fine filter, cool the plate heat exchanger (45-50 ℃), take the feed liquid as copper material in the P204 extraction process, and return the iron slag to a raw material zone for washing after slurrying. Although the extraction process is mature, certain problems exist in energy utilization, namely (1) the liquid after iron removal and pressure filtration enters an extraction box after being cooled by a plate heat exchanger, and the waste heat is not utilized. (2) The steam consumption of the heating solution in the iron removal process is 3.5t/tCo, and the cobalt processing cost is increased due to higher energy consumption. Therefore, it is necessary to design a waste heat recycling system in the process of cobalt extraction, purification and iron removal and application thereof, so that the consumption of steam in the iron removal process is reduced, and the production cost is further reduced. Disclosure of Invention Aiming at the problems of the prior art, the invention aims to provide a waste heat recycling system in the cobalt extraction purification iron removal process and application thereof, so as to solve the problem that the latent heat of the existing iron-removed liquid cannot be effectively utilized. In order to achieve the above purpose, the present invention adopts the following technical scheme: the waste heat recycling system in the cobalt extraction purification iron removal process comprises a plurality of iron removal tanks, wherein the iron removal tanks are connected with heat supply plate heat exchangers, a second heat supply plate heat exchanger water outlet is connected with a heat pump unit, the heat pump unit comprises a condenser and an evaporator, a second heat supply heat exchanger water inlet is connected with a water outlet of the evaporator of the heat pump unit, a waste heat plate heat exchanger is connected with a water outlet of the condenser of the heat pump unit, a first waste heat plate heat exchanger water outlet is connected with a water inlet of the condenser of the heat pump unit, and a second waste heat plate heat exchanger water outlet is connected with the iron removal tanks. More preferably, the heat pump unit is connected with an expansion tank. More preferably, the first water inlet of the heat supply plate heat exchanger and the second water inlet of the waste heat plate heat exchanger are connected with a plate-exchange back flushing hydrochloric acid solution tank. More preferably, the method also comprises the application of a waste heat recycling system in the cobalt extraction purification iron removal process, and the method comprises the following steps: (1) The dissolution liquid enters the waste heat exchanger through a water inlet II of the waste heat plate heat exchanger to perform heat exchange and temperature rise, and is discharged out of the waste heat plate heat exchanger through a water outlet II of the waste heat plate heat exchanger after the temperature of the dissolution liquid rises, and enters a plurality of iron removal tanks to perform iron removal; (2) The liquid after iron removal generated in the step (1) enters the heat supply plate heat exchanger through the first water inlet of the heat supply plate heat exchanger to exchange heat and cool, the temperature of the liquid after iron removal is lowered, and then the liquid after iron removal is discharged out of the heat supply plate heat exchanger through the first water outlet of the heat supply plate heat exchanger and enters the extraction procedure; (3) Chilled water in the evaporator of the heat pump unit enters the heat supply plate heat exchanger through the water inlet II of the heat supply plate heat exchanger, the chilled water exchanges heat and heats up in the heat supply plate heat exchanger through the heat provided in the absorption step (2), the warmed chilled water is discharged out of the heat supply plate heat exchanger through the water inlet II of the heat supply plate heat exchanger, and the chilled water enters the evaporator of the heat pump unit again; (4) The heat absorbed by the evaporator of the heat pump unit in the step (3) is transferred to the condenser of the heat pump unit through the heat pump refrigerant and the compressor, and the temperature of the circulating water of the condenser of the heat pump unit is increased; (5) The circulating w