CN107099679B - Method for inhibiting aluminum leaching in laterite-nickel ore high-pressure leaching process - Google Patents
Method for inhibiting aluminum leaching in laterite-nickel ore high-pressure leaching process Download PDFInfo
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- CN107099679B CN107099679B CN201710144586.2A CN201710144586A CN107099679B CN 107099679 B CN107099679 B CN 107099679B CN 201710144586 A CN201710144586 A CN 201710144586A CN 107099679 B CN107099679 B CN 107099679B
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- leaching
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- laterite
- pressure
- nickel ore
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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
- C22B23/0407—Leaching processes
- C22B23/0415—Leaching processes with acids or salt solutions except ammonium salts solutions
- C22B23/043—Sulfurated acids or salts thereof
Abstract
The invention discloses a method for inhibiting aluminum leaching in a laterite-nickel ore high-pressure leaching process. The method comprises the following steps: adding sodium sulfate and/or potassium sulfate into the pulp of the laterite-nickel ore for mixing before the high-pressure leaching of the laterite-nickel ore, preheating the mixed pulp, pumping the preheated pulp into a high-pressure kettle for leaching, and flashing the leached pulp to obtain the leached pulp. By applying the technical scheme of the invention, sodium sulfate and/or potassium sulfate is added into the ore pulp before the laterite-nickel ore is leached under high pressure, and sodium or potassium alum is formed at high leaching temperature, so that the leached part of aluminum is inhibited, the leaching rate of aluminum is reduced, and the consumption reduction and emission reduction of subsequent neutralization, iron and aluminum removal and filtration processes are realized.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for inhibiting aluminum leaching in a laterite-nickel ore high-pressure leaching process.
Background
The nickel in the oxidized nickel deposit accounts for 65-70% of the land-based nickel reserve on the earth ball and is the main mineral source for extracting the metal nickel. It is a loose clay-like ore composed of hydrous oxides of Fe, Al, Si, Mg and Ni, which is weathered and deteriorated for a long time by the silicate minerals of olivine, pyroxene, etc. containing Fe and Mg. The surface of the ore becomes red due to oxidation of iron, also known as laterite. Depending on the chemical composition, it can be divided into two types: one is the silicon-magnesium-nickel ore, which has high contents of nickel, silicon and magnesium, low contents of iron and cobalt and high nickel-iron ratio and is suitable for being treated by a pyrometallurgy process. The other is limonite type, the content of iron and cobalt is high, the content of magnesium is low, the content of nickel is also low, but the nickel content accounts for 70 percent of the laterite resource, so the development and the utilization of the laterite nickel ore are concerned.
The hydrometallurgical process of laterite-nickel ore which is commonly used in industry can be divided into normal pressure leaching and high pressure leaching according to the difference of pressure in the leaching process. Wherein, the high-pressure leaching has the characteristics of high recovery rate of nickel and cobalt, low leaching rate of iron and a selective cavity. In recent years, the development project of the laterite-nickel ore is carried out internationally, a wet process of pressure acid leaching is adopted more, and the pressure acid leaching technology is concerned greatly.
In the high-pressure leaching process of the laterite-nickel ore, the leaching rate of aluminum elements is influenced by the leaching temperature and the components of raw ores, the leaching rate is often changed and unstable, when the leaching rate is high, the consumption of a neutralizer in the subsequent process is extremely high, a large amount of slag is generated, and a large burden is caused to the neutralization and filtration process.
Disclosure of Invention
The invention aims to provide a method for inhibiting aluminum leaching in a laterite-nickel ore high-pressure leaching process so as to reduce the leaching rate of aluminum.
In order to achieve the above object, according to one aspect of the present invention, a method for inhibiting aluminum leaching in a laterite-nickel ore high-pressure leaching process is provided. The method comprises the following steps: adding sodium sulfate and/or potassium sulfate into the pulp of the laterite-nickel ore for mixing before the high-pressure leaching of the laterite-nickel ore, preheating the mixed pulp, pumping the preheated pulp into a high-pressure kettle for leaching, and flashing the leached pulp to obtain the leached pulp.
Further, sodium sulfate and/or potassium sulfate are added to the pulp of the lateritic nickel ore in the form of solid or aqueous solution.
Furthermore, the addition amount of the sodium sulfate and/or the potassium sulfate is 30-250 kg/t dry ore.
Further, the temperature in the autoclave is 150-280 ℃.
Further, the pressure in the autoclave is 2-5 MPa.
Further, the temperature of the ore pulp after preheating is 120-220 ℃.
Further, the leaching time is 0.5-2 hours.
Further, the flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃.
further, when the aqueous solution of sodium sulfate and/or potassium sulfate is added to the pulp of the lateritic nickel ore, the sodium sulfate and/or potassium sulfate takes the form of a saturated aqueous solution of sodium sulfate and/or potassium sulfate.
By applying the technical scheme of the invention, sodium sulfate and/or potassium sulfate is added into the ore pulp before the laterite-nickel ore is leached under high pressure, and sodium or potassium alum is formed at high leaching temperature, so that the leached part of aluminum is inhibited, the leaching rate of aluminum is reduced, and the consumption reduction and emission reduction of subsequent neutralization, iron and aluminum removal and filtration processes are realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
Fig. 1 shows a schematic flow diagram of a method for inhibiting aluminium leaching in a lateritic nickel ore high pressure leaching process according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
According to an exemplary embodiment of the invention, a method for inhibiting aluminum leaching in a laterite-nickel ore high-pressure leaching process is provided. The method comprises the following steps: adding sodium sulfate and/or potassium sulfate into the pulp of the laterite-nickel ore for mixing before the high-pressure leaching of the laterite-nickel ore, preheating the mixed pulp, pumping the preheated pulp into a high-pressure kettle for leaching, and flashing the leached pulp to obtain the leached pulp.
By applying the technical scheme of the invention, sodium sulfate and/or potassium sulfate is added into the ore pulp before the laterite-nickel ore is leached under high pressure, and sodium or potassium alum is formed at high leaching temperature, so that the leached part of aluminum is inhibited, the leaching rate of aluminum is reduced, and the consumption reduction and emission reduction of subsequent neutralization, iron and aluminum removal and filtration processes are realized. According to the method, the leaching rate of the aluminum can be controlled below 8 percent.
The main principle of the application of the invention is shown as follows:
3Al(SO)+12HO+MSO＝2MAl(SO)(OH)+6HSO
Wherein M is Na or K.
In the practice of the present invention, the sodium sulfate and/or potassium sulfate is added to the pulp of the lateritic nickel ore in the form of a solid or an aqueous solution, preferably, in the form of an aqueous solution, which is more advantageous to uniformly mix the sodium sulfate and/or potassium sulfate with the pulp of the lateritic nickel ore. Further preferably, the aqueous solution of sodium sulfate and/or potassium sulfate is a saturated aqueous solution of sodium sulfate and/or potassium sulfate.
preferably, the adding amount of the sodium sulfate and/or the potassium sulfate is 30-250 kg/t dry ore. Within the dosage range, the aluminum can be effectively inhibited, the raw materials are not wasted, and the benefit maximization of industrial production is ensured.
Preferably, the temperature in the autoclave is 150-280 ℃. The leaching rate of aluminum can be stably suppressed in this temperature range.
According to a typical embodiment of the invention, the pressure in the autoclave is 2 to 5 MPa. Within the pressure range, the leaching temperature can be increased to improve the leaching kinetics and increase the leaching rate of valuable metals.
The temperature of the ore pulp after preheating is 120-220 ℃. In the temperature range, the preheated ore pulp enters the high-pressure kettle, so that the temperature fluctuation can be reduced, and the energy consumption is reduced.
The leaching time is 0.5-2, so that the target substance can be fully leached while the production efficiency is ensured.
The flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃.
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
According to the process shown in figure 1, before the laterite-nickel ore is leached under high pressure, 50kg/t of dry ore sodium sulfate solid is added into the pulp of the laterite-nickel ore, the pulp is stirred and mixed, the mixed pulp is preheated (to 210 ℃) and pumped into an autoclave for leaching, the temperature in the autoclave is 245 ℃, the pressure is 3.7MPa, the leaching time is 1h, the pulp after leaching is subjected to flash evaporation (flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃), and the leaching rate of aluminum is reduced to 8%.
The pulp preheating steam is flash steam for preheating purposes. Flash steam is added in the leaching process to provide temperature for leaching. The concentrated sulfuric acid concentration is 98%.
Example 2
According to the process shown in figure 1, before the laterite-nickel ore is leached under high pressure, 30kg/t of potassium sulfate solid of dry ore is added into the pulp of the laterite-nickel ore, the mixture is stirred and mixed, the mixed pulp is preheated (to 210 ℃) and pumped into an autoclave for leaching, the temperature in the autoclave is 280 ℃, the pressure is 3.7MPa, the leaching time is 1h, the leached pulp is subjected to flash evaporation (the flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃), and the leaching rate of aluminum is reduced to 7%.
Example 3
According to the process shown in figure 1, before the laterite-nickel ore is leached under high pressure, sodium sulfate and potassium sulfate aqueous solution (the aqueous solution is saturated solution, the mass ratio of sodium sulfate to potassium sulfate is 1:1, which is equivalent to 100kg/t dry ore of sodium sulfate and potassium sulfate solids) is added into the pulp of the laterite-nickel ore, the mixture is stirred and mixed, the mixed pulp is preheated (preheated to 120 ℃) and pumped into an autoclave for leaching, the temperature in the autoclave is 150 ℃, the pressure is 2MPa, the leaching time is 1h, the leached pulp is subjected to flash evaporation (flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃), and the aluminum leaching rate is reduced to 7%.
Example 4
According to the process shown in figure 1, before the laterite-nickel ore is leached under high pressure, 250kg/t of potassium sulfate solid of dry ore is added into the pulp of the laterite-nickel ore, the mixture is stirred and mixed, the mixed pulp is preheated (to 220 ℃) and pumped into an autoclave for leaching, the temperature in the autoclave is 200 ℃, the pressure is 3MPa, the leaching time is 0.5h, the leached pulp is subjected to flash evaporation (the flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃), and the leaching rate of aluminum is reduced to 7%.
Example 5
According to the process shown in figure 1, before the laterite-nickel ore is leached under high pressure, sodium sulfate and potassium sulfate aqueous solution (the aqueous solution is saturated solution, the mass ratio of sodium sulfate to potassium sulfate is 1:1, which is equivalent to 100kg/t dry ore of sodium sulfate and potassium sulfate solids) is added into the pulp of the laterite-nickel ore, the mixture is stirred and mixed, the mixed pulp is preheated (preheated to 150 ℃), pumped into an autoclave for leaching, the temperature in the autoclave is 200 ℃, the pressure is 5MPa, the leaching time is 2 hours, the leached pulp is subjected to flash evaporation (flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃), and the aluminum leaching rate is reduced to 7%.
Comparative example
The steps and the process conditions are the same as those of the example 1, the only difference is that no sodium sulfate is added into the ore pulp before leaching, the ore pulp after leaching is subjected to flash evaporation, and the leaching rate of aluminum is 18 percent.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
Sodium sulfate and/or potassium sulfate are/is added into the ore pulp before the laterite-nickel ore is leached under high pressure, and sodium or potassium alum is formed at high leaching temperature, so that the leached part of aluminum is inhibited, and the leaching rate of aluminum is effectively reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for inhibiting aluminum leaching in a laterite-nickel ore high-pressure leaching process is characterized by comprising the following steps: adding sodium sulfate and/or potassium sulfate into the pulp of the laterite-nickel ore for mixing before the high-pressure leaching of the laterite-nickel ore, preheating the mixed pulp, pumping the preheated pulp into a high-pressure kettle for leaching, and flashing the leached pulp to obtain leached pulp; the addition amount of the sodium sulfate and/or potassium sulfate is 30-250 kg/t dry ore; the temperature in the autoclave is 150-280 ℃; the pressure in the autoclave is 2-5 MPa; the temperature of the ore pulp after preheating is 120-220 ℃; the leaching time is 0.5-2 hours; the flash evaporation is multi-stage flash evaporation, and the temperature is reduced to 100 ℃.
2. The method according to the claim 1, characterized in that the sodium and/or potassium sulphate is added to the pulp of lateritic nickel ores in the form of a solid or an aqueous solution.
3. The method according to the claim 2, characterized in that when the sodium and/or potassium sulfate is added to the pulp of lateritic nickel ores in the form of an aqueous solution, the aqueous solution of sodium and/or potassium sulfate is a saturated aqueous solution of sodium and/or potassium sulfate.
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| CN201710144586.2A CN107099679B (en) | 2017-03-10 | 2017-03-10 | Method for inhibiting aluminum leaching in laterite-nickel ore high-pressure leaching process |
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| CN107099679B true CN107099679B (en) | 2019-12-06 |
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| CN109837386A (en) * | 2019-03-13 | 2019-06-04 | 荆门市格林美新材料有限公司 | A kind of leaching method of lateritic nickel ore |
| CN110551892A (en) * | 2019-10-17 | 2019-12-10 | 中国恩菲工程技术有限公司 | mineral separation device containing tungsten-tin concentrate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768665A (en) * | 2008-12-30 | 2010-07-07 | 厦门紫金矿冶技术有限公司 | Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore |
| CN102260791A (en) * | 2011-07-29 | 2011-11-30 | 广西银亿科技矿冶有限公司 | Heap leaching method for red soil nickel ore |
| CN105463216A (en) * | 2015-11-27 | 2016-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Comprehensive utilization method of high-iron, high-aluminum and low-nickel type laterite-nickel ore |
| CN105692672A (en) * | 2014-11-28 | 2016-06-22 | 武汉科技大学 | Preparation method of mendozite |
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- 2017-03-10 CN CN201710144586.2A patent/CN107099679B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101768665A (en) * | 2008-12-30 | 2010-07-07 | 厦门紫金矿冶技术有限公司 | Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore |
| CN102260791A (en) * | 2011-07-29 | 2011-11-30 | 广西银亿科技矿冶有限公司 | Heap leaching method for red soil nickel ore |
| CN105692672A (en) * | 2014-11-28 | 2016-06-22 | 武汉科技大学 | Preparation method of mendozite |
| CN105463216A (en) * | 2015-11-27 | 2016-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Comprehensive utilization method of high-iron, high-aluminum and low-nickel type laterite-nickel ore |
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