CN103484668A - Weathering crust illuviation-type rare-earth ore leaching agent and method for extracting rare earths by using same - Google Patents
Weathering crust illuviation-type rare-earth ore leaching agent and method for extracting rare earths by using same Download PDFInfo
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Abstract
本发明提供了一种风化壳淋积型稀土矿浸矿剂及其提取稀土的方法。具体为一种用于风化壳淋积型稀土矿的浸矿剂溶液,其活性成分为柠檬酸盐;所述柠檬酸盐为柠檬酸铵、柠檬酸钠、柠檬酸钾和柠檬酸镁的任意一种,或者柠檬酸钠、柠檬酸钾和柠檬酸镁三者的混合。从风化壳淋积型稀土矿中提取稀土的方法,包括使用柠檬酸盐作为浸矿剂活性成分得到稀土浸取母液,除杂,加入沉淀剂得到稀土富集物。本发明在风化壳淋积型稀土提取的过程中除了有阳离子的交换作用还存在阴离子(柠檬酸根离子)的配合作用,两种作用协同能够提高稀土回收率降低浸矿剂的使用浓度和用量。The invention provides a weathering crust leaching type rare earth ore leaching agent and a method for extracting rare earth. Specifically, it is a leaching agent solution for weathering crust leaching type rare earth ore, and its active ingredient is citrate; the citrate is any of ammonium citrate, sodium citrate, potassium citrate and magnesium citrate One, or a combination of sodium citrate, potassium citrate, and magnesium citrate. The method for extracting rare earth from weathering crust leaching type rare earth ore includes using citrate as the active component of ore leaching agent to obtain rare earth leaching mother liquor, removing impurities, and adding a precipitant to obtain rare earth enrichment. In the process of extraction of weathering crust elution-type rare earths, in addition to the exchange of cations, the present invention also has the cooperation of anions (citrate ions), and the synergy of the two effects can improve the recovery rate of rare earths and reduce the concentration and dosage of leaching agents.
Description
技术领域technical field
本发明属于湿法冶金领域,具体涉及一种风化壳淋积型稀土矿浸矿剂及其提取稀土的方法。The invention belongs to the field of hydrometallurgy, and in particular relates to a weathering crust leaching type rare earth ore leaching agent and a method for extracting rare earth.
背景技术Background technique
风化壳淋积型稀土矿是一种特殊的稀土矿种,中重稀土配分高,是国家发展的战略矿种。风化壳淋积型稀土矿中稀土元素主要以水合或羟基水合离子的形式吸附于黏土矿物上,稀土品位低,仅为0.05~0.3%。矿石粒度极细,50%以上的稀土存于产率为24~32%的-0.78mm粒级中,常规的物理选矿无法使稀土富集为相应的稀土精矿,所以只能采用化学浸取技术。The weathering crust elution-type rare earth ore is a special rare earth mineral with a high proportion of medium and heavy rare earth, and it is a strategic mineral for national development. The rare earth elements in the weathering crust leaching type rare earth ores are mainly adsorbed on the clay minerals in the form of hydrated or hydroxyl hydrated ions, and the rare earth grade is low, only 0.05-0.3%. The ore particle size is extremely fine, and more than 50% of the rare earths are stored in the -0.78mm particle size with a yield of 24-32%. Conventional physical beneficiation cannot enrich rare earths into corresponding rare earth concentrates, so chemical leaching can only be used technology.
当风化壳淋积型稀土矿用盐类电解质溶液淋洗时,稀土离子就会被交换下来,类似于离子交换过程。无论是强碱、强酸、弱酸盐、强酸弱碱盐,高价盐或低价盐还是有机酸,以及能与稀土形成配合物的碱,在溶液浓度适当时,均能有效地浸出风化壳淋积型稀土矿中的离子相稀土。When the weathering crust elution-type rare earth ore is washed with a salt electrolyte solution, the rare earth ions will be exchanged, similar to the ion exchange process. Whether it is strong alkali, strong acid, weak acid salt, strong acid weak alkali salt, high-valent salt or low-valent salt or organic acid, as well as alkali that can form complexes with rare earths, when the solution concentration is appropriate, it can effectively leach weathering crust. Ionic phase rare earths in deposit-type rare earth ores.
为了提高浸取效率,降低资源消耗,减小环境污染,实现风化壳淋积型稀土资源的高效利用,人们从各方面入手对其浸取工艺进行改进,其中,浸矿剂的选择直接影响到浸出率的高低、生产所需成本,因此十分重要,是很多科学家目前重点研究的课题。目前普遍使用的浸矿剂一般是1~4%硫酸铵,具有较高的稀土回收率,但在南方生产较少,而稀土选矿对其的需求量又很大,故常常导致供不应求。因此,寻找一种替代硫酸铵的浸矿剂十分必要。In order to improve the leaching efficiency, reduce resource consumption, reduce environmental pollution, and realize the efficient utilization of weathering crust leaching type rare earth resources, people have improved the leaching process from various aspects. Among them, the choice of leaching agent directly affects The level of leaching rate and the cost required for production are therefore very important and are currently the focus of research by many scientists. At present, the commonly used leaching agent is generally 1-4% ammonium sulfate, which has a high recovery rate of rare earths, but it is less produced in the south, and the demand for rare earth beneficiation is very large, so the supply is often in short supply. Therefore, it is necessary to find a leaching agent to replace ammonium sulfate.
发明内容Contents of the invention
本发明目的在于提供一种新的风化壳淋积型稀土矿浸矿剂,该新型浸矿剂在浸取稀土的过程中,不仅存在阳离子的交换作用还存在阴离子的配合助浸作用,与目前普遍使用的硫酸铵浸矿剂相比,具有较低的浸取浓度和较少的用量的特点。The purpose of the present invention is to provide a new weathering crust leaching type rare earth ore leaching agent. In the process of leaching rare earth, this novel ore leaching agent not only has the exchange effect of cations but also the coordination leaching effect of anions, which is different from the current one. Compared with the commonly used ammonium sulfate leaching agent, it has the characteristics of lower leaching concentration and less dosage.
为达到上述目的,采用技术方案如下:In order to achieve the above purpose, the following technical solutions are adopted:
一种用于风化壳淋积型稀土矿的浸矿剂溶液,其活性成分为柠檬酸盐。A leaching agent solution for weathering crust elution type rare earth ore, the active ingredient of which is citrate.
按上述方案,所述柠檬酸盐为柠檬酸铵、柠檬酸钠、柠檬酸钾和柠檬酸镁的任意一种或任意混合。According to the above scheme, the citrate is any one or any mixture of ammonium citrate, sodium citrate, potassium citrate and magnesium citrate.
按上述方案,所述的柠檬酸盐活性成分含量为0.5-2.0wt%。According to the above scheme, the content of the citrate active ingredient is 0.5-2.0wt%.
按上述方案,所述的浸矿剂溶液pH值在3.0-8.0之间。According to the above scheme, the pH value of the ore leaching agent solution is between 3.0-8.0.
一种从风化壳淋积型稀土矿中提取稀土的方法,包括使用柠檬酸盐作为浸矿剂活性成分得到稀土浸取母液,除杂,加入沉淀剂得到稀土富集物。A method for extracting rare earths from weathering crust leaching type rare earth ores, comprising using citrate as an active ingredient of a leaching agent to obtain a rare earth leaching mother liquor, removing impurities, and adding a precipitating agent to obtain a rare earth enrichment.
按上述方案,所述柠檬酸盐为柠檬酸铵、柠檬酸钠、柠檬酸钾和柠檬酸镁的任意一种或任意混合。According to the above scheme, the citrate is any one or any mixture of ammonium citrate, sodium citrate, potassium citrate and magnesium citrate.
按上述方案,所述的柠檬酸盐活性成分含量为0.5-2wt%。According to the above scheme, the content of the citrate active ingredient is 0.5-2wt%.
按上述方案,还包括对浸矿剂溶液调节pH值到3.0-8.0。According to the above scheme, it also includes adjusting the pH value of the ore leaching agent solution to 3.0-8.0.
按上述方案,调节pH值时采用盐酸。According to the above scheme, hydrochloric acid was used to adjust the pH value.
按上述方案,所述沉淀剂为草酸或碳酸氢铵。According to the above scheme, the precipitation agent is oxalic acid or ammonium bicarbonate.
风化壳淋积型稀土矿浸取实质是一个离子交换反应,即黏土中稀土离子与浸矿剂中阳离子的交换过程。硫酸铵作为浸矿剂时的化学反应方程式如下:The leaching of weathering crust leaching type rare earth ore is essentially an ion exchange reaction, that is, the exchange process of rare earth ions in clay and cations in leaching agent. The chemical reaction equation when ammonium sulfate is used as a leaching agent is as follows:
[Al4(Si4O10)(OH)8]m·nRE3+ (s)+3nNH4 + (aq)=[Al4(Si4O10)(OH)8]m·3nNH4 + (s)+nRE(aq) [Al 4 (Si 4 O 10 )(OH) 8 ] m ·nRE 3+ (s) +3nNH 4 + (aq) =[Al 4 (Si 4 O 10 )(OH) 8 ] m ·3nNH 4 + ( s) +nRE (aq)
浸取交换阳离子与矿物表面的稀土离子发生交换从而阳离子吸附到矿物表面,稀土离子进入溶液中。当所用浸矿剂为柠檬酸盐时,发生下列化学反应:The leaching exchange cations are exchanged with the rare earth ions on the mineral surface so that the cations are adsorbed to the mineral surface and the rare earth ions enter the solution. When the leaching agent used is citrate, the following chemical reactions take place:
[Al4(Si4O10)(OH)8]m·nRE3+ (s)+nC6H5O7 3-+3nM(aq)=[Al4(Si4O10)(OH)8]m·3nM(s)+nC6H5O7REM=NH4 +,Na+,K+,Mg2+/2[Al 4 (Si 4 O 10 )(OH) 8 ] m nRE 3+ (s) +nC 6 H 5 O 7 3- +3nM (aq) =[Al 4 (Si 4 O 10 )(OH) 8 ] m 3nM (s) +nC 6 H 5 O 7 REM=NH 4 + ,Na + ,K + ,Mg 2+ /2
从以上反应可知,在浸矿过程中,柠檬酸的阳离子起到了与稀土离子的离子交换作用,而阴离子(柠檬酸根离子)参与稀土离子的配合作用,促进了浸矿反应向右进行,促进了稀土的浸出,从而提高了稀土回收率。From the above reactions, it can be known that during the leaching process, the cation of citric acid plays an ion exchange role with rare earth ions, and the anion (citrate ion) participates in the cooperation of rare earth ions, which promotes the leaching reaction to the right and promotes The leaching of rare earths improves the recovery rate of rare earths.
本发明的有益效果为:The beneficial effects of the present invention are:
1)本发明使用柠檬酸盐中一种或其中几种的混合物作为浸矿剂,与目前使用的其它浸矿剂相比,风化壳淋积型稀土提取的过程中除了有阳离子的交换作用还存在阴离子(柠檬酸根离子)的配合作用,两种作用协同能够提高稀土回收率降低浸矿剂的使用浓度和用量。1) The present invention uses one or a mixture of several kinds of citrates as the ore leaching agent. Compared with other ore leaching agents currently used, in the process of extracting the weathering crust leaching type rare earth, there is also a positive ion exchange effect. There is a synergistic effect of anion (citrate ion), and the synergy of the two effects can improve the recovery rate of rare earths and reduce the concentration and amount of leaching agent used.
2)所用柠檬酸盐含少量或不含铵根,能够减少氨氮废水污染,若使用无铵盐则可消除氨氮废水污染。2) The citrate used contains a small amount or no ammonium root, which can reduce the pollution of ammonia nitrogen wastewater. If ammonium-free salt is used, the pollution of ammonia nitrogen wastewater can be eliminated.
具体实施方式Detailed ways
下面结合实例对本发明作进一步说明,但并不限制本发明。The present invention will be further described below in conjunction with example, but does not limit the present invention.
离子相稀土总含量的测定:称取烘干的风化壳淋积型稀土矿250.0g,用质量百分比为2%的硫酸铵溶液为浸矿剂,对风化壳淋积型稀土矿进行柱浸,直至几乎没有稀土浸出为止,合并收集浸取液,EDTA容量法测定总离子相稀土含量为REO1.139mmol/250g稀土矿。Determination of the total content of rare earth in the ionic phase: Weigh 250.0 g of the dried weathering crust leaching type rare earth ore, use 2% ammonium sulfate solution as the leaching agent, and carry out column leaching to the weathering crust leaching type rare earth ore. Until almost no rare earth is leached out, the leachate is combined and collected, and the total ionic phase rare earth content is determined by EDTA volumetric method to be REO1.139mmol/250g rare earth ore.
实施例1Example 1
称取烘干的风化壳淋积型稀土矿250.0g,配制质量百分比为0.5%的柠檬酸铵((NH4)3C6H5O7)溶液为浸矿剂,按固液比(固体质量与浸矿剂体积比)1:2的比例,调节流速控制在0.4mL/min,对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量为REO1.119mmol/250g稀土矿,除杂后以草酸沉淀法富集,过滤,洗涤后在900℃条件下灼烧。Take by weighing 250.0g of the dried weathering crust leaching type rare earth ore, and prepare an ammonium citrate ((NH 4 ) 3 C 6 H 5 O 7 ) solution with a mass percentage of 0.5% as the ore leaching agent, according to the solid-to-liquid ratio (solid mass to leaching agent volume ratio) at a ratio of 1:2, adjust the flow rate at 0.4mL/min, perform column leaching on the weathering crust leaching type rare earth ore, and obtain the rare earth leaching mother liquor, and use the EDTA volumetric method to measure the rare earth content as REO1. 119mmol/250g rare earth ore, enriched by oxalic acid precipitation after removal of impurities, filtered, washed and burned at 900°C.
经分析测定,稀土回收率为94.3%(灼烧物直接称重与总离子相稀土含量对比得到回收率),纯度为92.6%(采用GB/T14635-2008)。According to analysis and determination, the recovery rate of rare earth is 94.3% (the recovery rate is obtained by directly weighing the burning material and comparing the total ionic phase rare earth content), and the purity is 92.6% (using GB/T14635-2008).
实施例2Example 2
称取烘干的风化壳淋积型稀土矿250.0g,配制质量百分比为1.5%的柠檬酸镁(Mg2(C6H5O7)3)溶液为浸矿剂,加入盐酸调节pH到5.0,按固液比1:2的比例,调节流速控制在0.4mL/min,对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量为REO0.0962mmol/250g稀土矿,除杂后以草酸沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of dried weathering crust elution-type rare earth ore, prepare a 1.5% by mass magnesium citrate (Mg 2 (C 6 H 5 O 7 ) 3 ) solution as a leaching agent, add hydrochloric acid to adjust the pH to 5.0 According to the solid-liquid ratio of 1:2, the flow rate is adjusted to be controlled at 0.4mL/min, and the weathering crust leaching type rare earth ore is column leached to obtain the rare earth leaching mother liquor. The rare earth content is measured by EDTA volumetric method as REO0.0962mmol/250g Rare earth ores are enriched by oxalic acid precipitation after impurity removal, filtered and washed, and burned at 900°C.
经分析测定,稀土回收率为92.3%,纯度为92.3%。After analysis and determination, the recovery rate of rare earth was 92.3%, and the purity was 92.3%.
实施例3Example 3
称取烘干的风化壳淋积型稀土矿250.0g,配制质量百分比为1.0%的柠檬酸钠(Na3C6H5O7·2H2O)溶液为浸矿剂,按固液比1:2的比例,调节流速控制在0.4mL/min,对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量为REO1.108mmol/250g稀土矿,除杂后以以碳酸氢铵沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of the dried weathered crust elution-type rare earth ore, and prepare a sodium citrate (Na 3 C 6 H 5 O 7 2H 2 O) solution with a mass percentage of 1.0% as the ore leaching agent. :2 ratio, adjust the flow rate to be controlled at 0.4mL/min, carry out column leaching to the weathering crust leaching type rare earth ore, obtain the rare earth leaching mother liquor and use the EDTA volumetric method to measure the rare earth content to be REO1.108mmol/250g rare earth ore, after removing impurities It is enriched by ammonium bicarbonate precipitation, filtered and washed, and burned at 900 °C.
经分析测定,稀土回收率为93.4%,纯度为92.1%。After analysis and determination, the recovery rate of rare earth was 93.4%, and the purity was 92.1%.
实施例4Example 4
称取烘干的风化壳淋积型稀土矿250.0g,配制质量百分比为1.0%的柠檬酸钾(K3C6H5O7·H2O)溶液为浸矿剂,按固液比1:2的比例,调节流速控制在0.4mL/min,对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量为REO1.110mmol/250g稀土矿,除杂后以碳酸氢铵沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of the dried weathering crust elution-type rare earth ore, prepare a 1.0% mass percent potassium citrate (K 3 C 6 H 5 O 7 ·H 2 O) solution as the ore leaching agent, and use a solid-to-liquid ratio of 1 :2 ratio, adjust the flow rate to be controlled at 0.4mL/min, carry out column leaching to the weathering crust leaching type rare earth ore, obtain the rare earth leaching mother liquor and use the EDTA volumetric method to measure the rare earth content to be REO1.110mmol/250g rare earth ore, after removing impurities It was enriched by ammonium bicarbonate precipitation, filtered and washed, and burned at 900°C.
经分析测定,稀土回收率为93.6%,纯度为92.7%。After analysis and determination, the recovery rate of rare earth was 93.6%, and the purity was 92.7%.
实施例5Example 5
称取烘干的风化壳淋积型稀土矿250.0g,配制以下混合柠檬酸盐浸矿剂(质量百分比):0.5%柠檬酸钠、0.5%柠檬酸钾、0.5%柠檬酸镁,其余为水,加入盐酸调节pH为7.3,按固液比1:2的比例,调节流速控制在0.4mL/min,对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量为REO1.111mmol/250g稀土矿,除杂后以草酸沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of the dried weathering crust leaching type rare earth ore, and prepare the following mixed citrate leaching agent (mass percentage): 0.5% sodium citrate, 0.5% potassium citrate, 0.5% magnesium citrate, and the rest is water , add hydrochloric acid to adjust the pH to 7.3, adjust the flow rate at 0.4mL/min according to the ratio of solid to liquid ratio of 1:2, carry out column leaching to the weathering crust leaching type rare earth ore, and obtain the rare earth leaching mother liquor and use the EDTA volumetric method to determine the rare earth The content is REO1.111mmol/250g rare earth ore. After removing impurities, it is enriched by oxalic acid precipitation, filtered and washed, and burned at 900 ° C.
经分析测定,稀土回收率为94.2%,纯度为92.2%。After analysis and determination, the recovery rate of rare earth was 94.2%, and the purity was 92.2%.
实施例6Example 6
称取烘干的风化壳淋积型稀土矿250.0g,按固液比1:2的比例分别用1%的硫酸铵及1.28%的柠檬酸铵((NH4)3C6H5O7)溶液为浸矿剂,此次使用的两种铵盐中铵离子含量一致(0.151mol/L NH4 +),对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量,除杂后以草酸沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of dried weathering crust elution-type rare earth ore, and use 1% ammonium sulfate and 1.28% ammonium citrate ((NH 4 ) 3 C 6 H 5 O 7 ) solution is the ore leaching agent, and the ammonium ion content in the two ammonium salts used this time is the same (0.151mol/L NH 4 + ), and column leaching is performed on the weathering crust leaching type rare earth ore to obtain the rare earth leaching mother liquor using EDTA capacity Rare earth content was determined by the method, enriched by oxalic acid precipitation after removal of impurities, filtered and washed, and burned at 900°C.
经分析测定,硫酸铵浸出液中稀土含量为REO0.9646mmol/250g稀土矿,稀土回收率为81.3%,纯度为92.3%;而柠檬酸铵浸出液中稀土含量为REO1.127mmol/250g稀土矿,稀土回收率为95.0%,纯度为92.2%。After analysis and determination, the rare earth content in the ammonium sulfate leaching solution is REO0.9646mmol/250g rare earth ore, the recovery rate of rare earth is 81.3%, and the purity is 92.3%; while the rare earth content in the ammonium citrate leaching solution is REO1.127mmol/250g rare earth ore, and the rare earth recovery rate is 81.3%. The yield was 95.0%, and the purity was 92.2%.
实施例7Example 7
称取烘干的风化壳淋积型稀土矿250.0g,按固液比1:2的比例分别用2%的柠檬酸钠(Na3C6H5O7·2H2O)及1.192%的氯化钠溶液为浸矿剂,此次使用的两种铵盐中钠离子含量一致(0.204mol/LNa+),对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量,除杂后以草酸沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of dried weathering crust elution-type rare earth ore, and use 2% sodium citrate (Na 3 C 6 H 5 O 7 2H 2 O) and 1.192% Sodium chloride solution is the ore leaching agent. The sodium ion content in the two ammonium salts used this time is the same (0.204mol/LNa + ). Column leaching is performed on the weathering crust leaching type rare earth ore to obtain the rare earth leaching mother liquor using EDTA capacity Rare earth content was determined by the method, enriched by oxalic acid precipitation after removal of impurities, filtered and washed, and burned at 900°C.
经分析测定,氯化钠浸出液中稀土含量为0.3319mmol/250g稀土矿,稀土回收率为28.1%,纯度为92.6%;而柠檬酸铵浸出液中稀土含量为1.126mmol/250g稀土矿,稀土回收率为94.9%,纯度为92.3%。After analysis and determination, the rare earth content in the sodium chloride leaching solution is 0.3319mmol/250g rare earth ore, the rare earth recovery rate is 28.1%, and the purity is 92.6%; while the rare earth content in the ammonium citrate leaching solution is 1.126mmol/250g rare earth ore, the rare earth recovery rate It is 94.9%, and the purity is 92.3%.
实施例8Example 8
称取烘干的风化壳淋积型稀土矿250.0g,按固液比1:2的比例分别用1.5%的硫酸镁及1.88%的柠檬酸镁溶液(Mg2(C6H5O7)3)为浸矿剂,此次使用的两种浸矿剂中镁离子含量一致(0.125mol/L Mg2+),对风化壳淋积型稀土矿进行柱浸,得到稀土浸取母液采用EDTA容量法测定稀土含量,除杂后以草酸沉淀法富集,过滤洗涤后在900℃条件下灼烧。Weigh 250.0g of dried weathering crust elution-type rare earth ore, and use 1.5% magnesium sulfate and 1.88% magnesium citrate solution (Mg 2 (C 6 H 5 O 7 ) 3 ) is the leaching agent. The content of magnesium ions in the two leaching agents used this time is the same (0.125mol/L Mg 2+ ). Column leaching is performed on the weathering crust leaching type rare earth ore to obtain the rare earth leaching mother liquor using EDTA The content of rare earths was determined by volumetric method, enriched by oxalic acid precipitation after removal of impurities, filtered and washed, and burned at 900°C.
经分析测定,硫酸镁浸出液中稀土含量为0.7393mmol/250g稀土矿稀土回收率为62.3%,纯度为92.0%;而柠檬酸铵浸出液中稀土含量为1.112mmol/250g稀土矿稀土回收率为93.7%,纯度为92.1%。After analysis and determination, the rare earth content in the magnesium sulfate leaching solution is 0.7393mmol/250g. The recovery rate of rare earth ore is 62.3%, and the purity is 92.0%. The rare earth content in the ammonium citrate leaching solution is 1.112mmol/250g. The recovery rate of rare earth ore is 93.7%. , with a purity of 92.1%.
实例6、7、8的结果可以看出,当浸矿剂阳离子浓度一定时,柠檬酸盐浸矿剂的稀土浸出率较高,因为柠檬酸根与稀土离子的配合作用促进了浸矿反应的进行,提高了稀土回收率。As can be seen from the results of examples 6, 7, and 8, when the cation concentration of the ore leaching agent was constant, the rare earth leaching rate of the citrate ore leaching agent was higher, because the coordination of citrate and rare earth ions promoted the carrying out of the leaching reaction , Improve the recovery rate of rare earth.
Claims (10)
- One kind for weathered superficial leaching rare-earth ore soak the ore deposit agent solution, it is characterized in that activeconstituents is Citrate trianion.
- As claimed in claim 1 for weathered superficial leaching rare-earth ore soak the ore deposit agent solution, it is characterized in that described Citrate trianion be ammonium citrate, Trisodium Citrate, Tripotassium Citrate and magnesium citrate any one or mix arbitrarily.
- As claimed in claim 1 for weathered superficial leaching rare-earth ore soak the ore deposit agent solution, it is characterized in that described Citrate trianion active component content is 0.5-2.0wt%.
- As claimed in claim 1 for weathered superficial leaching rare-earth ore soak the ore deposit agent solution, it is characterized in that the described ore deposit agent solution pH value of soaking between 3.0-8.0.
- 5. the method for an Extraction of rare earth from weathered superficial leaching rare-earth ore, comprise and use Citrate trianion to obtain rare earth leaching mother liquor as soaking ore deposit agent activeconstituents, and removal of impurities, add precipitation agent to obtain rareearth enriching material.
- 6. the method for Extraction of rare earth from weathered superficial leaching rare-earth ore as claimed in claim 5, it is characterized in that described Citrate trianion be ammonium citrate, Trisodium Citrate, Tripotassium Citrate and magnesium citrate any one or mix arbitrarily.
- 7. the method for Extraction of rare earth from weathered superficial leaching rare-earth ore as claimed in claim 5, is characterized in that described Citrate trianion active component content is 0.5-2wt%.
- 8. the method for Extraction of rare earth from weathered superficial leaching rare-earth ore as claimed in claim 5, characterized by further comprising and regulate the pH value to 3.0-8.0 to soaking the ore deposit agent solution.
- 9. the method for Extraction of rare earth from weathered superficial leaching rare-earth ore as claimed in claim 5, adopt hydrochloric acid while it is characterized in that regulating the pH value.
- 10. the method for Extraction of rare earth from weathered superficial leaching rare-earth ore as claimed in claim 5, is characterized in that described precipitation agent is oxalic acid or bicarbonate of ammonia.
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