CN111495603A

CN111495603A - Method for treating scheelite ore

Info

Publication number: CN111495603A
Application number: CN202010270497.4A
Authority: CN
Inventors: 王存锦; 胡庆民
Original assignee: Xiamen Jialu Metal Industrial Co ltd; Xiamen Tungsten Co Ltd
Current assignee: Xiamen Jialu Metal Industrial Co ltd; Xiamen Tungsten Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-08-07

Abstract

The invention discloses a method for treating scheelite, which comprises the following steps: (1) mixing the scheelite with an additive and water to obtain a solid-liquid mixture; (2) mixing the solid-liquid mixture with castor oil; (3) and (3) subjecting the mixture obtained in the step (2) to ore decomposition so as to finally obtain an APT product. The method can effectively eliminate the foam formed in the scheelite treatment process, thereby ensuring that the liquid level meters in all the procedures operate stably and accurately, further avoiding material loss and improving the recovery rate of tungsten element.

Description

Method for treating scheelite ore

Technical Field

The invention belongs to the field of metallurgy, and particularly relates to a method for treating scheelite.

Background

Most of mineral dressing processes of scheelite in the tungsten smelting industry at present are flotation methods, and the problem of massive bubbling of feed liquid is inevitably caused in the processes of decomposing and extracting tungsten and subsequently producing APT (ammonium paratungstate) of the scheelite. In a certain domestic tungsten smelting plant, a radar liquid level meter (the accuracy of a differential pressure liquid level meter is poor due to material concentration fluctuation) is adopted to control the liquid level of each storage tank in the process so as to realize automation and standardization of the whole operation process, but when the raw material is white tungsten ore with large residual quantity of certain flotation agents, the accuracy of the radar liquid level meter is seriously influenced by the bubbling problem of the feed liquid, and the stability and the accuracy of process control are not facilitated. Moreover, when the liquid level of the storage tank is high, the foam overflow easily causes material loss, and is not beneficial to on-site 5S maintenance.

Therefore, the bubbling problem in the scheelite treatment process needs to be solved.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one object of the present invention is to provide a method for treating scheelite, which can effectively eliminate foams formed during the scheelite treatment process, thereby ensuring that each process level gauge operates stably and accurately, further avoiding material loss, and improving the recovery rate of tungsten elements.

In one aspect of the invention, a method of processing a scheelite ore is provided. According to an embodiment of the invention, the method comprises:

(1) mixing the scheelite with an additive and water to obtain a solid-liquid mixture;

(2) mixing the solid-liquid mixture with castor oil;

(3) and (3) subjecting the mixture obtained in the step (2) to ore decomposition so as to finally obtain an APT product.

According to the method for treating the scheelite provided by the embodiment of the invention, the solid-liquid mixture obtained by mixing the scheelite, the additive and the water is mixed with the castor oil, the obtained mixture is supplied to the ore decomposition process, and the castor oil added in the mixing process can effectively eliminate foam formed in the scheelite treatment process, so that the stable and accurate operation of a liquid level meter in each process is ensured, the material loss is avoided, and the recovery rate of tungsten elements is improved.

In addition, the method for processing scheelite according to the above embodiment of the present invention may further have the following additional technical features:

in some embodiments of the invention, in the step (1), the mass ratio of the scheelite to the additive and the water is (2-20): 1:20.

In some embodiments of the present invention, in step (1), the additive is at least one selected from the group consisting of sodium phosphate, sodium hydroxide, sodium carbonate, sulfuric acid, and hydrochloric acid.

In some embodiments of the present invention, in step (1), the solid-liquid ratio of the solid-liquid mixture is 1: (1-20).

In some embodiments of the present invention, in the step (2), the castor oil is used in an amount of 0.1 to 50kg based on 1t of the scheelite.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic flow diagram of a method of processing scheelite ore according to one embodiment of the present invention.

Detailed Description

The following embodiments of the present invention are described in detail, and it should be noted that the following embodiments are exemplary only, and are not to be construed as limiting the present invention. In addition, all reagents used in the following examples are commercially available or can be synthesized according to methods herein or known, and are readily available to those skilled in the art for reaction conditions not listed, if not explicitly stated.

In one aspect of the invention, a method of processing a scheelite ore is provided. According to an embodiment of the invention, with reference to fig. 1, the method comprises:

s100: mixing scheelite with additive and water

In the step, the scheelite is mixed with an additive and water to obtain a solid-liquid mixture. Preferably, the mass ratio of the scheelite to the additive to the water is (2-20): 1:20. The inventors have found that the proportion of the additive to be added is determined by the amount of the additiveWO in scheelite₃If the additive amount is too low, the ore decomposition is incomplete, which affects the recovery rate, while if the additive amount is too large, the additive wastes the auxiliary materials and is not favorable for the treatment in the subsequent step. The adding proportion of the water is related to the solid-liquid ratio of the obtained solid-liquid mixture. Further, the additive is at least one selected from sodium phosphate, sodium hydroxide, sodium carbonate, sulfuric acid and hydrochloric acid. Specifically, the scheelite and the additive react to generate sodium tungstate or tungstic acid, so that the purpose of extracting tungsten is achieved. Further, the solid-liquid ratio of the obtained solid-liquid mixture is 1: (1-20). The inventor finds that if the solid-liquid ratio of the solid-liquid mixture is too high, the ore decomposition effect is influenced, the decomposition rate is poor, and meanwhile, if the solid-liquid ratio is too high, the specific gravity of the solid-liquid mixture is too high, and the equipment load is increased; and if the solid-liquid ratio of the solid-liquid mixture is too low, the productivity is low, the water consumption is high, and the comprehensive cost is high.

S200: mixing the solid-liquid mixture with castor oil

In this step, the solid-liquid mixture obtained above is mixed with castor oil. Specifically, when the liquid is agitated, many bubbles are generated on the surface and inside of the liquid, and the generated bubbles do not disappear, but are more aggregated, and foam is formed. A foam is a dispersion of a large number of bubbles dispersed in a liquid, the dispersed phase being a gas and the continuous phase being a liquid. Where the volume fraction occupied by the foaming liquid is small and the foam occupies a large volume. The gas is separated by a continuous liquid film to form bubbles of different sizes, which are accumulated to form foam. The medium capable of foaming is such as surfactant, and a layer of surfactant molecules which are arranged in an oriented way is adsorbed on the surface of the air bubble, and when the surface reaches a certain concentration, the wall of the air bubble forms a firm film. The surfactant is adsorbed on the gas-liquid interface to cause the surface tension of the liquid surface to be reduced, so that the gas-liquid contact surface is increased, and bubbles are not easy to merge. The bubbles have a relative density much less than the liquid itself and when rising bubbles penetrate the liquid surface, a layer of surfactant molecules is adsorbed on the surface. Therefore, the bubble film exposed to the air, on which the surfactant is adsorbed, is different from the bubble film in the solution, and it contains two layers of surfactant molecules to form a bimolecular film, and the adsorbed surfactant has a protective effect on the liquid film. The castor oil is to destroy and inhibit the formation of the film, and the castor oil enters the bimolecular oriented film of the foam to destroy the mechanical balance of the oriented film so as to achieve the foam breaking effect. Castor oil is a substance that is insoluble in the foaming medium and can be dispersed in the foaming medium in the form of droplets or droplets encapsulating particles of solid. Castor oil has a lower surface tension than the frothing medium and spontaneously enters the liquid film to break up the bubbles. The castor oil is easy to spread on the surface of the solution and automatically spreads on the surface of the foam, and can take away a layer of solution adjacent to the surface to locally thin a liquid film, so that the critical thickness is reached, the liquid film is broken, and the foam is damaged. The faster the castor oil spreads on the surface of the solution, the thinner the liquid film becomes, the faster the foam destruction speed is, and the defoaming effect is enhanced. The reason for defoaming is therefore, on the one hand, that it is easy to spread, and that the adsorbed molecules of the defoaming agent replace the molecules of the foaming agent, resulting in a film of poorer strength. Meanwhile, partial solution adjacent to the surface layer is taken away in the spreading process, so that the foam liquid film is thinned, the stability of the foam is reduced, and the foam is easy to damage. Further, the amount of the castor oil is 0.1-50 kg based on 1t of the scheelite. The inventor finds that if the adding amount of the castor oil is too small, the defoaming effect cannot be achieved, or the defoaming effect cannot meet the requirement, when the adding amount of the castor oil is added to a certain amount, the defoaming effect is good, and at the moment, if the excessive castor oil is continuously added, unnecessary waste can be caused. Further, the inventors have found that there is a great difference in the amount of castor oil added for different ore raw materials to achieve the same antifoaming effect, which should be mainly determined by the amount of active agent added during the beneficiation of the ore raw materials and ultimately remaining in the ore.

S300: subjecting the mixture obtained in step S200 to ore decomposition

In the step, the mixture obtained in the step S200 is subjected to ore decomposition, blending, ion exchange (or extraction), impurity removal, evaporative crystallization and drying, and an APT product is finally obtained. It should be noted that the processes of ore decomposition, blending, ion exchange (or extraction), impurity removal, evaporative crystallization, drying, and the like in this step are conventional processes for preparing an APT product in the prior art, and those skilled in the art can select the processes according to actual needs, and are not described herein again.

The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.

Example 1

Mixing 2 tons of scheelite with 100kg of additive sodium phosphate and 3900kg of water to prepare a solid-liquid mixture with a solid-liquid ratio of 1:2, then adding 0.5kg of castor oil, and finally pumping the obtained solid-liquid mixture into the next ore decomposition process for producing an APT product. In the whole production operation flow, obvious bubbling phenomenon is not found in materials at each stage, and the radar liquid level meter of each storage tank in each procedure stably and accurately runs.

Example 2

Mixing 2 tons of scheelite with 500kg of additive sodium hydroxide and 11500kg of water to prepare a solid-liquid mixture with a solid-liquid ratio of 1:6, then adding 2kg of castor oil, and finally pumping the obtained solid-liquid mixture into the next ore decomposition process for producing an APT product. In the whole production operation flow, obvious bubbling phenomenon is not found in materials at each stage, and the radar liquid level meter of each storage tank in each procedure stably and accurately runs.

Example 3

Mixing 2 tons of scheelite with 800kg of additive hydrochloric acid and 19200kg of water to prepare a solid-liquid mixture with a solid-liquid ratio of 1:10, then adding 10kg of castor oil, and finally pumping the obtained solid-liquid mixture into the next ore decomposition process for producing an APT product. In the whole production operation flow, obvious bubbling phenomenon is not found in materials at each stage, and the radar liquid level meter of each storage tank in each procedure stably and accurately runs.

Example 4

Mixing 2 tons of scheelite with 1000kg of additive sulfuric acid and 29000kg of water to prepare a solid-liquid mixture with a solid-liquid ratio of 1:15, then adding 50kg of castor oil, and finally pumping the obtained solid-liquid mixture into the next ore decomposition process for producing an APT product. In the whole production operation flow, obvious bubbling phenomenon is not found in materials at each stage, and the radar liquid level meter of each storage tank in each procedure stably and accurately runs.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A method of processing a scheelite ore, comprising:

(2) mixing the solid-liquid mixture with castor oil;

2. The method according to claim 1, wherein in the step (1), the mass ratio of the scheelite to the additive and the water is (2-20): 1:20.

3. The method according to claim 1 or 2, wherein in step (1), the additive is at least one selected from the group consisting of sodium phosphate, sodium hydroxide, sodium carbonate, sulfuric acid and hydrochloric acid.

4. The method according to claim 1, wherein in step (1), the solid-liquid ratio of the solid-liquid mixture is 1: (1-20).

5. The method according to claim 1, wherein in the step (2), the castor oil is used in an amount of 0.1 to 50kg based on 1t of the scheelite.