阅读说明：本技术 一种保持铟高效萃取的方法 (Method for keeping efficient extraction of indium ) 是由 白如斌 肖庆峰 李春林 李建福 于 2020-08-19 设计创作，主要内容包括：一种保持铟高效萃取的方法,涉及金属矿物提取技术领域,其将铟萃取工艺中经过反萃后的有机相,与分离剂混合,得到自上而下层状分布的稀释剂、萃取剂、第一水相以及沉淀物。再回收稀释剂、萃取剂与融合剂混合重新融合为新有机相,返回铟萃取工序使用。在这个过程中,一方面,贫有机相中的杂质生成沉淀被分离出去,从而解决了有机相中毒的问题,保证了有机相的纯净度。另一方面,在加入分离机后,稀释剂和萃取剂被彻底分成了两层,能够直观准确地判断出二者的配比,以便及时调整二者的比例,保证铟萃取的高效进行。该方法的操作简单,使用方便,具有较佳的实用价值。(A method for keeping efficient extraction of indium relates to the technical field of metal mineral extraction, and is characterized in that an organic phase subjected to back extraction in an indium extraction process is mixed with a separating agent to obtain a diluent, an extracting agent, a first water phase and a precipitate which are distributed in a layered manner from top to bottom. And then recovering the diluent, the extracting agent and the fluxing agent, mixing and re-fusing to obtain a new organic phase, and returning to the indium extraction process for use. In the process, on one hand, the impurities in the poor organic phase are generated and precipitated and separated out, thereby solving the problem of organic phase poisoning and ensuring the purity of the organic phase. On the other hand, after the separating machine is added, the diluent and the extracting agent are thoroughly separated into two layers, and the proportion of the diluent and the extracting agent can be visually and accurately judged, so that the proportion of the diluent and the extracting agent can be adjusted in time, and the efficient indium extraction is ensured. The method is simple to operate, convenient to use and high in practical value.)

1. A method for maintaining efficient extraction of indium, comprising:

mixing and stirring the poor organic phase and a separating agent, and standing for layering to obtain a diluent, an extracting agent, a first water phase and a precipitate which are distributed in a layered manner from top to bottom;

collecting the diluent and the extracting agent, mixing and stirring the diluent and the extracting agent with the fusion agent, and standing and layering to obtain a new organic phase and a second water phase which are distributed in a layered manner; recovering the new organic phase;

wherein the poor organic phase is an organic phase which is obtained by back extraction of indium in the indium extraction process; the separating agent is an alkali solution; the fluxing agent is an acid solution.

2. The method for maintaining high-efficiency extraction of indium as claimed in claim 1, wherein the pH of the separating agent is 12 to 14.

3. The method for maintaining efficient extraction of indium as claimed in claim 2, wherein the volume ratio of the organic-poor phase to the separating agent is 1: 0.8 to 1.2.

4. The method for maintaining high-efficiency extraction of indium as claimed in claim 3, wherein the mixing of the organic poor phase and the separating agent is performed by stirring at 40-70 rpm for 3-5 min and then standing for 2-3 min.

5. The method for maintaining high-efficiency extraction of indium as claimed in claim 4, wherein when the diluent, the extracting agent and the fluxing agent are mixed, the ratio of the total volume of the diluent and the extracting agent to the volume of the fluxing agent is 1: 0.2 to 0.4.

6. The method for maintaining high-efficiency extraction of indium as claimed in claim 5, wherein the fluxing agent is sulfuric acid solution with concentration of 120-135 g/L.

7. The method for maintaining high-efficiency extraction of indium as claimed in claim 6, wherein the diluent layer, the extractant layer and the fluxing agent are mixed by stirring at 40-70 rpm for 15-20 min and then standing for 5-7 min.

8. The method for maintaining efficient extraction of indium as claimed in claim 7, further comprising: supplementing the diluent or the extractant in the recovered new organic phase layer.

Technical Field

The invention relates to the technical field of metal mineral extraction, in particular to a method for keeping high-efficiency extraction of indium.

Background

Indium minerals are associated in many non-ferrous metal sulphide minerals, in particular zinc sulphide minerals, followed by galena, lead oxide minerals, tin minerals, copper sulphide minerals, antimony sulphide minerals and the like. Although indium is primarily enriched in some non-ferrous metal concentrates, it is generally not directly available as a raw material for indium extraction due to its low indium grade. Crude zinc, crude lead, furnace slag, leaching slag, solution, smoke dust, alloy, anode mud and the like obtained after the non-ferrous metal concentrate is smelted or ironed in a blast furnace are main raw materials for extracting indium.

The extraction process of indium is mainly an extraction-electrolysis method, which is also the mainstream process technology for indium production in the world nowadays. The process flow is as follows: indium-containing raw material → enrichment → chemical dissolution → purification → extraction → back extraction → zinc (aluminum) displacement → sponge indium → electrolytic refining → refined indium. In the extraction process, the main extractant used is P204, the diluent is kerosene, and in the mixed use process of P204 and kerosene, because of continuous volatilization of kerosene and the loss caused by the removal of raffinate, proportion imbalance is caused, and simultaneously because the production process runs for a long time, the entrainment and other harmful elements in the organic phase are continuously enriched. Due to the two factors, the indium extraction rate is unstable and is difficult to control, and even if a large amount of organic substances are poisoned, the third-order quantity is generated during extraction.

Disclosure of Invention

The invention aims to provide a method for maintaining high-efficiency extraction of indium, which is simple to operate and convenient to use, and can maintain the proportion and purity of extraction liquid in indium extraction, thereby ensuring high-efficiency operation of the indium extraction process.

The embodiment of the invention is realized by the following steps:

a method of maintaining efficient extraction of indium comprising:

mixing and stirring the poor organic phase and a separating agent, and standing for layering to obtain a diluent, an extracting agent, a first water phase and a precipitate which are distributed in a layered manner from top to bottom;

collecting the diluent and the extracting agent, mixing and stirring the diluent and the extracting agent with the fusion agent, standing and layering to obtain a new organic phase and a second water phase which are distributed in a layered manner; recovering a new organic phase;

wherein the poor organic phase is an organic phase which is obtained by back extracting indium in the indium extraction process; the separating agent is an alkali solution; the fluxing agent is an acid solution.

The embodiment of the invention has the beneficial effects that:

the embodiment of the invention provides a method for maintaining high-efficiency extraction of indium, which is characterized in that an organic phase subjected to back extraction in an indium extraction process is mixed with a separating agent to obtain a diluent, an extracting agent, a first water phase and a precipitate which are distributed in a layered manner from top to bottom. And then recovering the diluent, the extracting agent and the fluxing agent, mixing and re-fusing to obtain a new organic phase, and returning to the indium extraction process for use. In the process, on one hand, the impurities in the poor organic phase are generated and precipitated and separated out, thereby solving the problem of organic phase poisoning and ensuring the purity of the organic phase. On the other hand, after the separating machine is added, the diluent and the extracting agent are thoroughly separated into two layers, and the proportion of the diluent and the extracting agent can be visually and accurately judged, so that the proportion of the diluent and the extracting agent can be adjusted in time, and the efficient indium extraction is ensured. The method is simple to operate, convenient to use and high in practical value.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a flow chart of a method for maintaining efficient indium extraction according to the present invention;

FIG. 2 is a schematic diagram of a method for maintaining efficient indium extraction in a layered state after a separating agent is added.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The method for maintaining the efficient extraction of indium according to the embodiment of the present invention is described in detail below, and the flow chart thereof can be seen in fig. 1.

The embodiment of the invention provides a method for keeping efficient extraction of indium, which comprises the following steps:

and S1, mixing and stirring the poor organic phase and the separating agent, standing and layering to obtain the diluting agent, the extracting agent, the first water phase and the precipitate which are distributed in a layered manner from top to bottom.

S2, collecting the diluent and the extractant, mixing and stirring the diluent and the extractant with the fluxing agent, standing and layering to obtain a new organic phase and a second water phase which are distributed in a layered manner; a new organic phase is recovered.

The conventional indium extraction process flow is to enrich, chemically dissolve and purify the indium-containing raw material, then extract the indium-containing raw material by using an organic solvent, wherein an organic phase obtained after extraction needs to be subjected to back extraction by using water, and the organic phase obtained after the back extraction is the poor organic phase related to the application. The organic solvent for extraction is formed by mixing an extracting agent P204 and a diluting agent kerosene according to a specific proportion, and after extraction and back extraction are finished, the obtained poor organic phase is conveyed to an extraction section for reuse. In theory, efficient extraction of indium can be maintained as long as the ratio of extractant to diluent remains constant. However, in actual production, on one hand, because kerosene is volatilized continuously and is carried away by raffinate, loss can cause the proportion of the extractant and the diluent to be unbalanced; on the other hand, as the production process is operated for a long time, the entrainment and other harmful elements in the organic phase are continuously enriched, the organic phase is poisoned, and the extraction is difficult to be layered or a third phase appears. The above problems all result in a low efficiency of indium extraction.

Based on this, the applicant collects the lean organic phase after the back extraction is completed, and mixes the lean organic phase with a separating agent, wherein the separating agent is an alkali solution, and the pH value is 12-14. Mixing and standing to obtain the diluent, the extractant, the first water phase and the precipitate which are distributed in a layered manner from top to bottom as shown in figure 2. In the process, on one hand, the impurities in the poor organic phase are generated and precipitated and separated out, thereby solving the problem of organic phase poisoning and ensuring the purity of the organic phase. On the other hand, after the separating machine is added, the diluent and the extracting agent are thoroughly separated into two layers, and the proportion of the diluent and the extracting agent can be visually and accurately judged, so that the proportion of the diluent and the extracting agent can be adjusted in time, and the efficient indium extraction is ensured.

Further, the preparation method of the separating agent comprises the following steps: adding alkali into fresh water to adjust the pH value to 12-14, and heating to 80-95 ℃. When the organic-poor phase and the separating agent are mixed, the volume ratio of the organic-poor phase to the separating agent is 1: 0.8 to 1.2. In the proportion, the separating agent has better separating effect and can promote better and faster layering of each phase. Optionally, the mixing of the poor organic phase and the separating agent is to stir for 3-5 min at the rotating speed of 40-70 rpm so as to fully mix and react the poor organic phase and the separating agent; and then standing for 2-3 min to fully separate all phases.

And after standing and layering, discharging the precipitate and the first water phase at the lower layer, and recovering the diluent and the extractant at the upper layer. The recovered diluent and extractant can be re-melted into a new organic phase by mixing with the fluxing agent, and returned to the indium extraction process for reuse.

Wherein the fluxing agent is an acid solution. Optionally, the fluxing agent is a sulfuric acid solution, and the concentration is 120-135 g/L. When the diluent, the extracting agent and the fluxing agent are mixed, the volume ratio of the total volume of the diluent and the extracting agent to the volume of the fluxing agent is 1: 0.2 to 0.4. In the proportion range, the diluent and the extracting agent can be quickly and efficiently fused into a new organic phase, and the extraction effect of the newly formed new organic phase relative to indium is better guaranteed. Optionally, the diluent layer, the extractant layer and the fluxing agent are mixed by stirring at the rotating speed of 40-70 rpm for 15-20 min, so that the diluent layer, the extractant layer and the fluxing agent can be fully mixed and reacted; and then standing for 5-7 min to ensure that the new organic phase and the second aqueous phase can be sufficiently separated, so that the new organic phase is convenient to recover.

Further, the method for maintaining the efficient extraction of indium provided by the embodiment of the invention further comprises supplementing a diluent or an extracting agent in the recovered new organic phase layer. If the proportion of the extracting agent and the diluent is found to be unbalanced in the separating process of the separating agent, the diluent or the extracting agent is added into the recovered new organic phase, so that the new organic phase can be recovered to the optimal proportion, and the extraction efficiency of the indium is guaranteed.

In addition, the precipitate recovered in the process can be further conveyed to a volatilization kiln, and the impurity zinc in the precipitate is recovered. The first aqueous phase contains a large amount of alkali and can be returned to the alkali washing section for use. The second aqueous phase contains a large amount of acid and can be returned to the leaching stage for chemical dissolution.

The features and properties of the present invention are described in further detail below with reference to examples.