A soft potassium magnesium sulfate flotation composite reagent and its application

Abstract

The present invention relates to the technical field of mineral flotation, and in particular to a soft potassium magnesium alum flotation composite reagent and its application. The present invention provides a soft potassium magnesium alum flotation composite reagent, comprising a collector and a frother; the collector comprises R-C6H4NaO3S; R is an alkyl group. The soft potassium magnesium alum flotation composite reagent of the present invention has stronger adsorption selectivity and collection capacity. Under the same dosage, the soft potassium magnesium alum flotation composite reagent has a higher recovery rate and grade of the soft potassium magnesium alum concentrate obtained by flotation, thereby significantly improving the flotation separation efficiency of the soft potassium magnesium alum.

Description

Technical Field

[0001] The invention relates to the technical field of mineral flotation, in particular to a soft kaolinite flotation composite reagent and application thereof. Background Art

[0002] Soft potassium magnesium alum is an important intermediate for extracting potassium from sulfate salt lake brine to produce potassium sulfate. It is also a chlorine-free potash fertilizer containing multiple nutrients such as sulfur and magnesium, also known as potassium sulfate magnesium fertilizer. Domestic soft potassium magnesium alum is mainly extracted from sulfate salt lake brine resources. The salt lake brine is naturally evaporated in the salt field to obtain potassium-magnesium mixed salt ore, which is then used as a raw material to produce soft potassium magnesium alum through a two-stage conversion method and a conversion-flotation method. Due to the problems of the two-stage forwarding method, such as a long process flow, heating treatment required for conversion, high energy consumption, poor adaptability to raw ore and operating media, and large investment in production equipment, this process has been gradually replaced by the conversion-flotation method.

[0003] At present, the research on the flotation separation of soft potassium magnesium alum is mainly based on reverse flotation to remove sodium chloride, and its flotation collectors include carboxylic acids, fatty amides, morpholines and other agents. Philip of the American International Mining and Chemical Company used isopropyl benzoic acid as a collector for sodium chloride to flotate and remove sodium chloride from potassium salt mines, thereby obtaining potassium salt products with a KCl content greater than 89%. Arno Singewald used fatty amides as collectors to flotate and remove sodium chloride from sodium chloride-calcium carbonate mixed minerals, and obtained a calcium salt product with a calcium carbonate grade of 98%. James L of the United States used dodecyl morpholine as a sodium chloride flotation collector to flot and remove sodium chloride from potassium salt mines and some water-soluble potassium salt mineral raw materials, and the final potassium chloride recovery rate could reach 88% to 95%. The reverse flotation of kaolinite has a good effect on removing sodium chloride and can obtain high-grade kaolinite products. However, it is only suitable for kaolinite materials with low sodium chloride content and has poor adaptability to material properties. Therefore, its application and promotion are limited. Summary of the invention

[0004] The object of the present invention is to provide a leonite flotation composite reagent and application thereof, wherein the leonite flotation composite reagent has better adaptability to the sodium chloride content in the leonite material and can obtain a high-grade leonite product.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The invention provides a composite flotation reagent for soft potassium magnesium sulfate, comprising a collector and a frother;

[0007] The collector includes R-C6H4NaO3S; R is an alkyl group.

[0008] Preferably, R is an alkyl group having 5 to 20 carbon atoms.

[0009] Preferably, the foaming agent includes one or more of No. 2 oil, pine oil, methyl isobutyl carbinol and octanol.

[0010] Preferably, the mass ratio of the collector to the foaming agent is (60-99):(1-40).

[0011] The present invention also provides the application of the composite philasite flotation reagent described in the above technical solution in the field of flotation separation of philasite.

[0012] Preferably, the application comprises the following steps:

[0013] The potassium mixed salt conversion product and the saturated mother liquor of kainite-potassium chloride are mixed to obtain a flotation pulp;

[0014] After mixing the leonite flotation composite reagent and the flotation pulp, air is introduced to separate the leonite from sodium chloride;

[0015] The soft kainite flotation composite reagent is the soft kainite flotation composite reagent described in the above technical solution.

[0016] Preferably, the mass percentage of the potassium mixed salt conversion product with a particle size less than 0.125 mm in the potassium mixed salt conversion product is ≥ 80%;

[0017] The potassium mixed salt conversion product includes 12-15 wt% K + , 4-10wt% Na + , 3-7wt% Mg 2+ , 25~35wt% SO4 2- , 12~18wt% Cl - .

[0018] Preferably, the saturated mother liquor of kainite-potassium chloride contains 2-4 wt% of K + , 2~4wt% Na + , 3-5wt% Mg 2+ , 3~8wt% SO4 2- , 12~15wt% Cl - .

[0019] Preferably, the temperature of the flotation pulp is 20-35° C., and the pH value is 5.5-7.5.

[0020] Preferably, the dosage ratio of the soft potassium magnesium alum flotation composite reagent and the flotation pulp is (50-500) g: 1 t.

[0021] The present invention provides a composite flotation agent for soft potassium magnesium alum, comprising a collector and a frother; the collector comprises R-C6H4NaO3S; R is an alkyl group. The benzenesulfonic acid group in the composite agent of the present invention has a strong affinity for soft potassium magnesium alum, but has no affinity for sodium chloride, and can selectively adsorb soft potassium magnesium alum, thereby realizing the hydrophobicization of the surface of soft potassium magnesium alum particles. At the same time, the frother in the composite agent can stabilize the three-phase interface, promote the adhesion of soft potassium magnesium alum particles and bubbles after the adsorption of R-C6H4NaO3S, and finally realize the efficient flotation recovery of soft potassium magnesium alum. Therefore, under the same dosage, the soft potassium magnesium alum concentrate obtained by flotation of the composite flotation agent for soft potassium magnesium alum has a higher recovery rate and grade, thereby significantly improving the flotation separation efficiency of soft potassium magnesium alum. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the application process of the soft potassium magnesium sulfate composite agent. DETAILED DESCRIPTION

[0023] The invention provides a composite flotation reagent for soft potassium magnesium sulfate, comprising a collector and a frother;

[0024] The collector includes R-C6H4NaO3S; R is an alkyl group.

[0025] In the present invention, R is preferably an alkyl group having 5 to 20 carbon atoms (the alkyl group is preferably a linear alkyl group or a branched alkyl group), and more preferably an alkyl group having 8 to 15 carbon atoms. In an embodiment of the present invention, R is specifically a linear alkyl group having 12 carbon atoms.

[0026] In the present invention, the structural formula of R-C6H4NaO3S is shown in Formula 1:

[0027]

[0028] In the present invention, the foaming agent preferably includes one or more of No. 2 oil, pine oil, methyl isobutyl carbinol and octanol. When the foaming agent is two or more of the above specific selections, the present invention has no special limitation on the ratio of the above specific substances, and they can be mixed in any ratio.

[0029] In the present invention, the mass ratio of the collector to the foaming agent is preferably (60-99):(1-40), more preferably (70-85):(15-30), and most preferably (75-80):(20-25).

[0030] In the present invention, the method for preparing the composite flotation reagent of kainite preferably comprises mixing a collector and a frother. The present invention does not have any special limitation on the mixing process, and the process well known to those skilled in the art can be used.

[0031] The present invention also provides the application of the composite philasite flotation reagent described in the above technical solution in the field of flotation separation of philasite.

[0032] like Figure 1 As shown, in the present invention, the application preferably includes the following steps:

[0033] The potassium mixed salt conversion product and the saturated mother liquor of kainite-potassium chloride are mixed to obtain a flotation pulp;

[0034] After mixing the leonite flotation composite reagent and the flotation pulp, air is introduced to separate the leonite from sodium chloride;

[0035] The soft kainite flotation composite reagent is the soft kainite flotation composite reagent described in the above technical solution.

[0036] In the present invention, unless otherwise specified, all preparation raw materials are commercially available products well known to those skilled in the art.

[0037] The present invention mixes the potassium mixed salt conversion product and the saturated mother liquor of kainite-potassium chloride to obtain the flotation pulp.

[0038] In the present invention, the mass percentage of the potassium mixed salt conversion product with a particle size of less than 0.125 mm in the potassium mixed salt conversion product is preferably ≥80%, more preferably 80-85%; the potassium mixed salt conversion product preferably includes 12-15wt% of K + , 4-10wt% Na + , 3-7wt% Mg 2+ , 25~35wt% SO4 2- , 12~18wt% Cl - .

[0039] In the present invention, the saturated mother liquor of kainite-potassium chloride preferably comprises 2-4 wt% of K + , 2~4wt% Na + , 3-5wt% Mg 2+ , 3~8wt% SO4 2- , 12~15wt% Cl - .

[0040] In the present invention, the mass ratio of the potassium mixed salt conversion product to the saturated mother liquor of kainite-potassium chloride is preferably 1:(1-8), more preferably 1:(2-5), and most preferably 1:(2.5-3.5).

[0041] In the present invention, the mixing is preferably carried out under stirring conditions. The present invention does not have any special limitation on the stirring process, and the stirring process may be carried out using a process well known to those skilled in the art.

[0042] In the present invention, the temperature of the flotation pulp is preferably 20-35°C, more preferably 25-30°C, the pH value is preferably 5.5-7.5, more preferably 6.0-7.0, and the mass solid content of the flotation pulp is preferably 10-30%, more preferably 15-25%.

[0043] After obtaining the flotation pulp, the present invention mixes the leonite flotation composite reagent with the flotation pulp, and then introduces air to separate the leonite from sodium chloride.

[0044] In the present invention, the dosage ratio of the soft potassium magnesium alum flotation composite reagent to the flotation pulp is preferably (50-500) g: 1 t, more preferably (200-400) g: 1 t, and most preferably (250-350) g: 1 t.

[0045] In the present invention, the mixing is preferably carried out under stirring conditions; the present invention has no special limitation on the stirring process, and the collector can be selectively adsorbed on the surface of the soft potassium sulfate by a process well known to those skilled in the art. In the present invention, the stirring time is 2 minutes.

[0046] The present invention has no special limitation on the process of introducing air, and the process well known to those skilled in the art can be adopted to float and separate the langbeinite.

[0047] The soft potassium magnesium alum flotation composite reagent and its application provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0048] Example 1

[0049] 200g of potassium mixed salt conversion product (the mass percentage of the potassium mixed salt conversion product with a particle size less than 0.125mm is 85.37%, and the potassium mixed salt conversion product includes 14.21wt% of K + , 6.26wt% Na + , 5.14wt%Mg 2+ , 29.36wt% SO4 2- , 15.73wt% Cl - ) and 550 g of kainite-potassium chloride co-saturated mother liquor (including 3.27 wt% of K + , 3.11wt% Na + , 4.75wt% Mg 2+ , 5.93wt% SO42- , 13.68wt% Cl - ) was added into a 500 mL flotation tank, mixed, stirred at a speed of 2100 r / min to obtain a flotation pulp (the mass concentration of the flotation pulp was 25%, the temperature was 25° C., and the pH value was 7);

[0050] According to the mass ratio of 350g:1t, 350g of soft potassium magnesium alum flotation composite reagent (mass ratio of C 18 H 29 NaO3S (R is a straight-chain alkyl with 12 carbon atoms) and No. 2 oil) are mixed with the flotation slurry, stirred for 2 minutes, so that the collector is selectively adsorbed on the surface of soft potassium sulfate, and air is introduced to make the soft potassium sulfate particles float to obtain a foam product and tailings in the flotation tank;

[0051] The foam product and tailings are filtered, weighed and tested respectively, and the Na content in the obtained kainite concentrate (the foam product) is + The mass percentage of K is 1.45%, + The recovery rate was 97.31%.

[0052] Example 2

[0053] 200g of potassium mixed salt conversion product (the mass percentage of the potassium mixed salt conversion product with a particle size less than 0.125mm is 82.72%, and the potassium mixed salt conversion product includes 12.13wt% of K + , 8.74wt% Na + , 5.62wt% Mg 2+ , 31.54wt% SO4 2- , 15.27wt% Cl - ) and 550 g of saturated mother liquor of kainite-potassium chloride (including 3.15 wt% of K + , 2.94wt%Na + , 4.53wt% Mg 2+ , 5.71wt% SO4 2- , 13.84wt% Cl - ) was added into a 500 mL flotation tank, mixed, stirred at a speed of 2100 r / min to obtain a flotation pulp (the mass concentration of the flotation pulp was 25%, the temperature was 25° C., and the pH value was 7);

[0054] According to the mass ratio of 250g:1t, 350g of soft potassium magnesium alum flotation composite reagent (mass ratio of C 18 H 29NaO3S (R is a straight-chain alkyl group with 12 carbon atoms) and MIBC frother) are mixed with the flotation slurry, stirred for 2 minutes, so that the collector is selectively adsorbed on the surface of soft kaolinite, and air is introduced to make the soft kaolinite particles float to obtain a foam product and tailings in the flotation tank;

[0055] The foam product and tailings are filtered, weighed and tested respectively, and the Na content in the obtained kainite concentrate (the foam product) is + The mass percentage of K is 2.85%, + The recovery rate was 95.53%.

[0056] Example 3

[0057] 200g of potassium mixed salt conversion product (the mass percentage of the potassium mixed salt conversion product with a particle size less than 0.125mm is 83.21%, and the potassium mixed salt conversion product includes 13.71wt% of K + , 5.86wt% Na + , 5.34wt% Mg 2+ , 30.56wt% SO4 2- , 14.63wt% Cl - ) and 450 g of saturated mother liquor of kainite-potassium chloride (including 2.96 wt% of K + , 3.21wt% Na + , 4.43wt% Mg 2+ , 5.83wt% SO4 2- , 13.62wt% Cl - ) was added into a 500 mL flotation tank, mixed, stirred at a speed of 2100 r / min to obtain a flotation pulp (the mass concentration of the flotation pulp was 15%, the temperature was 25° C., and the pH value was 7);

[0058] According to the mass ratio of 250g:1t, 350g of soft potassium magnesium alum flotation composite reagent (mass ratio of C 18 H 29 NaO3S (R is a straight-chain alkyl group with 12 carbon atoms) and ethylene glycol as a foaming agent) are mixed with the flotation slurry, stirred for 2 minutes, so that the collector is selectively adsorbed on the surface of the soft potassium sulfate, and air is introduced to make the soft potassium sulfate particles float to obtain a foam product and tailings in the flotation tank;

[0059] The foam product and tailings are filtered, weighed and tested respectively, and the Na content in the obtained kainite concentrate (the foam product) is + The mass percentage of K is 2.03%, + The recovery rate was 97.72%

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Application of a composite flotation agent for kainite in the flotation separation of kainite, characterized in that: The soft potassium magnesium sulfate flotation composite reagent is composed of a collector and a frother; The collector is R-C6H4NaO3S; R is a straight-chain alkyl group with 12 carbon atoms; The foaming agent is No. 2 oil or methyl isobutyl carbinol; The mass ratio of the collector to the foaming agent is (80-85): (15-20).

2. The use according to claim 1, characterized in that The following steps are involved: The potassium mixed salt conversion product and the saturated mother liquor of kainite-potassium chloride are mixed to obtain a flotation pulp; After the soft potassium magnesium alum flotation composite reagent and the flotation slurry are mixed, air is introduced to perform separation.

3. The use according to claim 2, characterized in that The mass percentage of the potassium mixed salt conversion product with a particle size of less than 0.125 mm in the potassium mixed salt conversion product is ≥ 80%; The potassium mixed salt conversion product includes 12-15 wt% K + , 4~10wt% Na + , 3~7wt% Mg 2+ , 25~35wt% SO4 2- , 12~18wt% Cl - .

4. The use according to claim 2, characterized in that The saturated mother liquor of kainite-potassium chloride contains 2-4 wt% of K + , 2~4wt% Na + , 3~5wt% Mg 2+ , 3~8wt% SO4 2- , 12~15wt% Cl - .

5. The use according to claim 2, characterized in that The temperature of the flotation pulp is 20-35° C., and the pH value is 5.5-7.

5.

6. The use according to claim 2, characterized in that The dosage ratio of the soft potassium magnesium alum flotation composite reagent to the flotation pulp is (50-500) g: 1 t.

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