Recovery method and application of potassium ions in tail salt mixed solution

Abstract

The invention discloses a method for recovering potassium ions in a tail salt mixed solution and application, and the method comprises the following steps: adding brine into the tail salt mixed solution, and mixing to obtain a brine mixed solution; adding the brine mixed solution into a tubular reactor for reaction; after the reaction is finished, carrying out solid-liquid separation to obtain tail solid and tail liquid; according to the recovery method disclosed by the invention, the brine is added into the tail salt mixed solution, and the dissolution of solid potassium salt in the tail salt mixed solution can be promoted by utilizing the unsaturated characteristic of the brine, so that the potassium ions are recycled; in addition, original production equipment can be utilized, and on the premise that power does not need to be increased, the comprehensive recovery rate of salt lake potassium mixed salt mine production is greatly increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the chemical technology field, and in particular to a method for recovering potassium ions in a tail salt mixed solution and application thereof. BACKGROUND

[0002] The traditional tail solid process is that the potassium mixed salt mine is converted by decomposition and then floated to further process the crude product, the tail solid is precipitated into a tail solid pool together with the mother liquor, the liquid is recycled, and the tail solid is precipitated into a tail solid pool. This process is widely used in salt lake potassium magnesium sulfate fertilizer production plants, and the process flow is simple. The problems are that the potassium ion content in the tail solid is between 1.2% and 1.6%, and if the potassium ions in the tail solid are recovered, additional costs are required, and enterprises lack motivation and economic benefits. The tail solid is stored as waste, and has not been developed and utilized for a long time, resulting in great waste of resources.

[0003] Therefore, the present application is provided. SUMMARY

[0004] The purpose of the present application is to provide a method for recovering potassium ions in a tail salt mixed solution and application thereof. The recovery method of the present application can promote the dissolution of solid potassium salt in the tail salt mixed solution by adding brine to the tail salt mixed solution, and then realize the recovery and utilization of potassium ions by utilizing the unsaturated characteristics of the brine.

[0005] In order to achieve the above purpose of the present application, the following technical scheme is adopted:

[0006] The present application provides a method for recovering potassium ions in a tail salt mixed solution, which comprises the following steps:

[0007] (a) adding brine to the tail salt mixed solution to mix, to obtain a brine mixed solution, wherein the brine comprises the following mass percentage components:

[0008] 0.27% to 0.5% of potassium ions, 7.31% to 8.96% of sodium ions, 0.71% to 2.05% of magnesium ions, 0.88% to 5.71% of sulfate ions, and 13.49% to 15.47% of chloride ions;

[0009] (b) adding the brine mixed solution to a tubular reactor to react;

[0010] (c) after the reaction is completed, solid-liquid separation is performed to obtain tail solid and tail liquid.

[0011] Preferably, the volume ratio of the liquid in the tail salt mixed solution to the brine is 1:(1-2).

[0012] Preferably, the tail salt mixed solution is a mixture of tail salt and mother liquor after the potassium mixed salt mine is decomposed, converted and floated.

[0013] Preferably, the mass-volume ratio of the tail salt and the mother liquor in the tail salt mixture is (2-3) : 2.

[0014] Preferably, the tail salt comprises the following components in the following mass percentage:

[0015] Potassium ions 1.2%-1.6%, sodium ions 25%-16%, magnesium ions 3%-4%, sulfate ions 12%-14%, and chloride ions 40%-45%.

[0016] Preferably, the mother liquor comprises the following components in the following mass percentage:

[0017] Potassium ions 2%-3%, sodium ions 2%-3%, magnesium ions 4%-6%, sulfate ions 7%-8%, and chloride ions 14%-16%.

[0018] Preferably, the reaction temperature is room temperature, and the reaction time is 15-30 min.

[0019] The second aspect of the present application provides an application of the recovery method of potassium ions in the tail salt mixture in the beneficiation of potassium mixed salt mines.

[0020] Compared with the prior art, the present application has at least the following beneficial effects:

[0021] The recovery method of the present application can promote the dissolution of solid potassium salt in the tail salt mixture by adding brine to the tail salt mixture, thereby realizing the recovery and utilization of potassium ions. In addition, the present application can utilize the original production equipment, greatly improving the comprehensive recovery rate of salt lake potassium mixed salt mines without increasing power. DETAILED DESCRIPTION

[0022] The embodiments of the technical solutions of the present application will be described in detail below with reference to the embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the skilled in the art to which the present application belongs.

[0024] The embodiments of the present application provide a recovery method of potassium ions in a tail salt mixture, which comprises the following steps:

[0025] (a) adding brine to the tail salt mixture for mixing to obtain a brine mixture, wherein the brine comprises the following components in the following mass percentage:

[0026] Potassium ions 0.27%–0.5%, sodium ions 7.31%–8.96%, magnesium ions 0.71%–2.05%, sulfate ions 0.88%–5.71%, and chloride ions 13.49%–15.47%;

[0027] (b) The brine mixture is added to a tubular reactor for reaction;

[0028] (c) After the reaction is complete, solid-liquid separation is performed to obtain tail solid and tail liquid.

[0029] The recovery method of this invention adds brine to the tailings mixture, and utilizes the unsaturated properties of the brine to promote the dissolution of solid potassium salts in the tailings mixture, thereby realizing the recovery and utilization of potassium ions. In addition, this invention can utilize existing production equipment and greatly improve the overall recovery rate of potassium mixed salt production in salt lakes without the need for additional power.

[0030] In one embodiment, the volume ratio of liquid to brine in the tail salt mixture is 1:(1-2).

[0031] In one embodiment, the tailings mixture is a mixture of tailings and mother liquor from the decomposition, conversion, and flotation of potassium mixed salt ore.

[0032] In one embodiment, the mass-to-volume ratio of tailings to mother liquor in the tailings mixture is (2-3):2.

[0033] In one embodiment, the tailings salt comprises the following components in weight percentage:

[0034] Potassium ions 1.2%–1.6%, sodium ions 25%–16%, magnesium ions 3%–4%, sulfate ions 12%–14%, and chloride ions 40%–45%.

[0035] In one embodiment, the mother liquor comprises the following components by mass percentage:

[0036] Potassium ions 2%–3%, sodium ions 2%–3%, magnesium ions 4%–6%, sulfate ions 7%–8%, and chloride ions 14%–16%.

[0037] In one embodiment, the reaction temperature is room temperature and the reaction time is 15 to 30 minutes.

[0038] Another embodiment of the present invention provides an application of the above-mentioned method for recovering potassium ions from tailings mixture in potassium mixed salt ore beneficiation.

[0039] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0040] The raw materials used in the following embodiments are as follows:

[0041] Tailings salt comprises the following components by mass percentage:

[0042] Potassium ions 1.4%, sodium ions 25.84%, magnesium ions 3.55%, sulfate ions 13.10%, and chloride ions 42.00%.

[0043] Alternatively, potassium ions 1.6%, sodium ions 25.84%, magnesium ions 3.55%, sulfate ions 13.10%, and chloride ions 42.00%;

[0044] The mother liquor contains the following components by mass percentage:

[0045] Potassium ions 2.26%, sodium ions 2.47%, magnesium ions 5.06%, sulfate ions 7.51%, and chloride ions 15.07%.

[0046] Example 1

[0047] This embodiment describes a method for recovering potassium ions from tailings mixture, the method comprising the following steps:

[0048] (a) Add 380 ml of brine to the tail salt mixture and mix to obtain a brine mixture, wherein the brine comprises the following components by mass percentage:

[0049] Potassium ions 0.5%, sodium ions 7.31%, magnesium ions 2.05%, sulfate ions 5.71%, and chloride ions 13.49%;

[0050] The tailings mixture is a mixture of 500g of tailings from the decomposition, conversion, and flotation of potassium mixed salt ore and 380ml of mother liquor; the tailings comprises the following components by mass percentage:

[0051] Potassium ions 1.4%, sodium ions 25.84%, magnesium ions 3.55%, sulfate ions 13.10%, and chloride ions 42.00%;

[0052] (b) Add the brine mixture to a tubular reactor and react at room temperature for 20 min;

[0053] (c) After the reaction is complete, solid-liquid separation is performed to obtain tail solid and tail liquid.

[0054] Example 2

[0055] This embodiment describes a method for recovering potassium ions from tailings mixture, the method comprising the following steps:

[0056] (a) Add 470 ml of brine to the tail salt mixture and mix to obtain a brine mixture, wherein the brine comprises the following components by mass percentage:

[0057] Potassium ions 0.5%, sodium ions 7.31%, magnesium ions 2.05%, sulfate ions 5.71%, and chloride ions 13.49%;

[0058] The tailings mixture is a mixture of 500g of tailings from the decomposition, conversion, and flotation of potassium mixed salt ore and 380ml of mother liquor; the tailings comprises the following components by mass percentage:

[0059] Potassium ions 1.6%, sodium ions 25.84%, magnesium ions 3.55%, sulfate ions 13.10%, and chloride ions 42.00%;

[0060] (b) Add the brine mixture to a tubular reactor and react at room temperature for 20 min;

[0061] (c) After the reaction is complete, solid-liquid separation is performed to obtain tail solid and tail liquid.

[0062] Example 3

[0063] This embodiment describes a method for recovering potassium ions from tailings mixture, the method comprising the following steps:

[0064] (a) Add 760 ml of brine to the tail salt mixture and mix to obtain a brine mixture, wherein the brine comprises the following components by mass percentage:

[0065] Potassium ions 0.5%, sodium ions 7.31%, magnesium ions 2.05%, sulfate ions 5.71%, and chloride ions 13.49%;

[0066] The tailings mixture is a mixture of 500g of tailings from the decomposition, conversion, and flotation of potassium mixed salt ore and 380ml of mother liquor; the tailings comprises the following components by mass percentage:

[0067] Potassium ions 1.6%, sodium ions 25.84%, magnesium ions 3.55%, sulfate ions 13.10%, and chloride ions 42.00%;

[0068] (b) Add the brine mixture to a tubular reactor and react at room temperature for 20 min;

[0069] (c) After the reaction is complete, solid-liquid separation is performed to obtain tail solid and tail liquid.

[0070] Example 4

[0071] This embodiment describes a method for recovering potassium ions from tailings mixture, the method comprising the following steps:

[0072] (a) Add 470 ml of brine to the tail salt mixture and mix to obtain a brine mixture, wherein the brine comprises the following components by mass percentage:

[0073] Potassium ions 0.27%, sodium ions 8.96%, magnesium ions 0.71%, sulfate ions 0.88%, and chloride ions 15.47%;

[0074] The tailings mixture is a mixture of 500g of tailings from the decomposition, conversion, and flotation of potassium mixed salt ore and 380ml of mother liquor; the tailings comprises the following components by mass percentage:

[0075] Potassium ions 1.6%, sodium ions 25.84%, magnesium ions 3.55%, sulfate ions 13.10%, and chloride ions 42.00%;

[0076] (b) Add the brine mixture to a tubular reactor and react at room temperature for 20 min;

[0077] (c) After the reaction is complete, solid-liquid separation is performed to obtain tail solid and tail liquid.

[0078] Experimental Example

[0079] Potassium ion recovery was performed according to the methods in Examples 1-4, and the content of each component in the tailings solid and tailings liquid was detected. The results are shown in Table 1.

[0080]

[0081]

[0082] As shown in Table 1:

[0083] The technical solution proposed in this application can better recover potassium ions from tailings and improve the potassium ion recovery rate by adding brine.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for recovering potassium ions from tailings mixture, characterized in that, The recycling method includes the following steps: (a) Adding brine to the tail salt mixture and mixing to obtain a brine mixture, wherein the brine comprises the following components by mass percentage: Potassium ions 0.27%–0.5%, sodium ions 7.31%–8.96%, magnesium ions 0.71%–2.05%, sulfate ions 0.88%–5.71%, and chloride ions 13.49%–15.47%; (b) The brine mixture is added to a tubular reactor for reaction; (c) After the reaction is complete, solid-liquid separation is performed to obtain tail solid and tail liquid.

2. The recycling method according to claim 1, characterized in that, The volume ratio of liquid to brine in the tail salt mixture is 1:(1-2).

3. The recycling method according to claim 1, characterized in that, The tailings mixture is a mixture of tailings and mother liquor after the decomposition, transformation, and flotation of potassium mixed salt ore.

4. The recycling method according to claim 3, characterized in that, The mass-to-volume ratio of tailings to mother liquor in the tailings mixture is (2-3):

2.

5. The recycling method according to claim 3, characterized in that, The tailings salt comprises the following components by mass percentage: Potassium ions 1.2%–1.6%, sodium ions 25%–16%, magnesium ions 3%–4%, sulfate ions 12%–14%, and chloride ions 40%–45%.

6. The recycling method according to claim 3, characterized in that, The mother liquor contains the following components by mass percentage: Potassium ions 2%–3%, sodium ions 2%–3%, magnesium ions 4%–6%, sulfate ions 7%–8%, and chloride ions 14%–16%.

7. The recycling method according to claim 1, characterized in that, The reaction temperature is room temperature, and the reaction time is 15 to 30 minutes.

8. The application of the method for recovering potassium ions from tailings mixture according to any one of claims 1 to 7 in the beneficiation of potassium mixed salt ore.

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