Flotation process for improving boron yield

Abstract

The invention provides a flotation process for improving boron yield, which comprises the following steps: S1, crushing and grinding boron ore to obtain boron ore powder, and then adding water for size mixing; s2, after ore pulp is filtered, an activating agent and a collecting agent are added and stirred, and a second-stage boric acid solution is obtained; s3, sodium hydroxide and hydrochloric acid are added into the secondary boric acid solution to adjust the PH value; s4, adding starch into the secondary boric acid solution, so that boric acid and starch molecules are subjected to condensation reaction to form boric acid cross-linked starch, and bubbles are continuously generated; s5, boric acid is captured by the collecting agent and then floats to the upper layer of the second-stage boric acid solution; s6, carrying out hydroxylation reaction on sodium hydroxide and boric acid crosslinked starch to form functional groups, so as to obtain a boric acid crosslinked starch hydroxyl material; and S7, collecting upper-layer foam of the secondary boric acid solution, drying to obtain boric acid, and then filtering the secondary boric acid solution to obtain boric acid cross-linked starch hydroxyl material precipitate. According to the method, the boric acid cross-linked starch hydroxyl material is generated while the boric acid is floated, and the yield of boron in the boron ore is effectively increased.

Description

Technical Field

[0001] The invention belongs to the field of mineral flotation, and specifically relates to a flotation process for improving boron yield. Background Art

[0002] The characteristics of my country's boron resources are: first, rich reserves and low grade; second, many types of ores, many paragenetic and associated minerals; third, uneven distribution of production areas and excessive concentration. Especially in recent years, with large-scale mining, boron ores with relatively high boron content are becoming less and less, and the remaining low-grade boron ore resources are difficult to use and have low industrial value.

[0003] With the development of social economy, the demand for boron products in my country has increased year by year. If we continue to use the existing mature process to produce boron products with increasingly lower grade boron-containing minerals as raw materials, we will inevitably face problems such as reduced yield and quality, and it will be difficult to meet the industrial demand for boron products. Therefore, finding high-grade boron-containing minerals and improving the production process of boron compounds are issues that urgently need to be solved.

[0004] The existing invention patent with patent number 201210489545.4 provides a method for extracting borax from mixed salt by reverse flotation. The slurry obtained after grinding the boron ore is sent to a flotation machine for flotation. This technical solution requires the use of a flotation device during the flotation process, which is relatively costly.

[0005] There is another invention patent with the patent number of 201610410938.X, which provides a method for enriching low-grade boron-containing tailings by froth flotation. The process of this method is mineral crushing, grinding, adding water to adjust the pulp, flotation, scraping foam, and drying. This process is different from the previous research on flotation, which was carried out on a special flotation machine. This process can make a simple flotation device according to the flotation principle, which reduces the flotation cost. The self-made simple flotation device used in this technical solution actually uses an air compressor to introduce air into the pulp, and its cost reduction is still limited.

[0006] Therefore, there is a need in the art for a flotation process that can increase boron recovery while reducing costs. Summary of the invention

[0007] 1. Technical issues to be resolved In view of the above technical problems, the present invention provides a flotation process for improving boron recovery.

[0008] (II) Technical solution The present invention provides a flotation process for improving boron yield, the steps are as follows: S1: crushing the boron ore and grinding it to obtain boron ore powder, and then adding water to form a slurry with a weight percentage concentration of 30-60%; S2: After filtering the ore pulp, a primary boric acid solution is obtained, an activator is first added to the primary boric acid solution, and then a collector is added, and finally a stirrer is used to fully stir the solution to obtain a secondary boric acid solution; S3: adding sodium hydroxide and hydrochloric acid to the secondary boric acid solution to adjust the pH value of the secondary boric acid solution; S4: continuously and quantitatively adding starch into the secondary boric acid solution, and then controlling the reaction temperature and time to allow boric acid to react with starch molecules to form boric acid cross-linked starch and continuously generate bubbles; S5: The collector in the secondary boric acid solution captures the boric acid and floats it to the upper layer of the secondary boric acid solution; S6: sodium hydroxide reacts with boric acid cross-linked starch to form a functional group, thereby obtaining a boric acid cross-linked starch hydroxyl material; S7: collecting the foam on the upper layer of the secondary boric acid solution and drying it to obtain boric acid, and then filtering the secondary boric acid solution to obtain a boric acid cross-linked starch hydroxyl material precipitate.

[0009] In some embodiments of the present invention, in step S1, the boron ore is crushed and ground to a particle size of 30-80 mesh, and then water is added to prepare the slurry in a mixer.

[0010] In some embodiments of the present invention, in step S2, sodium oleate powder is used as a collector, and calcium lignin sulfonate is used as an activator. The amount of sodium oleate powder is 0.02-0.50 kg / t of raw ore, and the amount of calcium lignin sulfonate is 0.02-2.00 kg / t of raw ore.

[0011] In some embodiments of the present invention, the pH value of the secondary boric acid solution in step S3 is adjusted to 8.5-10.

[0012] In some embodiments of the present invention, the starch is added for 40-60 minutes in step S4, and the temperature of the secondary boric acid solution is 45-65° C. when the starch is added.

[0013] In some embodiments of the present invention, the formation of the boric acid cross-linked starch in step S4 and the floating of the boric acid after being captured by the collector in step S5 occur simultaneously.

[0014] In some embodiments of the present invention, the ratio of the amount of sodium hydroxide added in step S3 to the boric acid content in the secondary boric acid solution is 2:1.

[0015] In some embodiments of the present invention, the boric acid cross-linked starch hydroxyl material precipitate in step S7 is washed and dried to obtain the boric acid cross-linked starch hydroxyl modified material.

[0016] In some embodiments of the present invention, the adding of starch and the stirring in step S4 are performed simultaneously.

[0017] (III) Beneficial effects It can be seen from the above technical solution that the present invention has at least one of the following beneficial effects: (1) The present invention uses starch to react with boric acid solution to generate bubbles, which replaces the flotation machine and other flotation devices, not only effectively reducing the cost of boric acid flotation, but also enabling flotation to be completed in places where it is inconvenient to install the flotation device.

[0018] (2) The present invention can utilize the remaining boric acid to generate boric acid cross-linked starch hydroxylation modified material while flotating boric acid, and the boron yield in the boric acid solution is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the flotation process steps of the present invention. DETAILED DESCRIPTION

[0020] The present invention provides a flotation process for improving boron recovery. To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. Specific embodiments Example 1 like Figure 1 As shown, the present invention provides a flotation process for improving boron yield, the steps are as follows: S1: crushing the boron ore and grinding it to obtain boron ore powder, crushing the boron ore to a particle size of 30 mesh, and then adding water in a mixer to form a slurry with a weight percentage concentration of 30%; S2: After filtering the ore pulp, a primary boric acid solution is obtained. An activator is first added to the primary boric acid solution, and then a collector is added. The collector is sodium oleate powder, and the amount of the sodium oleate powder is 0.02 kg / t of the original ore. The activator is calcium lignin sulfonate, and the amount of the calcium lignin sulfonate is 0.02 kg / t of the original ore. Finally, a stirrer is used to fully stir to obtain a secondary boric acid solution. S3: adding sodium hydroxide and hydrochloric acid to the secondary boric acid solution to adjust the pH value of the secondary boric acid solution to 8.5, wherein the ratio of the amount of sodium hydroxide added to the boric acid content in the secondary boric acid solution is 2:1; S4: Continuously and quantitatively adding starch into the secondary boric acid solution, so that boric acid and starch molecules undergo a condensation reaction to form boric acid cross-linked starch and continuously generate bubbles. The starch addition time is 40 minutes. When the starch is added, the temperature of the secondary boric acid solution is 45° C., and the starch needs to be stirred throughout the entire process. S5: The collector in the secondary boric acid solution captures the boric acid and is then carried by the bubbles to float to the upper layer of the secondary boric acid solution. The formation of boric acid cross-linked starch and the floating of the boric acid after being captured by the collector occur simultaneously. S6: sodium hydroxide reacts with boric acid cross-linked starch to form a functional group, thereby obtaining a boric acid cross-linked starch hydroxyl material; S7: collecting the foam on the upper layer of the secondary boric acid solution and drying it to obtain boric acid, then filtering the secondary boric acid solution to obtain a boric acid cross-linked starch hydroxyl material precipitate, and washing and drying the boric acid cross-linked starch hydroxyl modified material to obtain the boric acid cross-linked starch hydroxyl modified material.

[0022] The boric acid concentration in the remaining boric acid mother liquor of this embodiment is 0.24%.

[0023] Example 2 The present invention provides a flotation process for improving boron yield, the steps are as follows: S1: crushing the boron ore and grinding it to obtain boron ore powder, the boron ore is crushed and ground to a particle size of 50 mesh, and then water is added to the blender to form a slurry with a weight percentage concentration of 45%; S2: After filtering the ore pulp, a primary boric acid solution is obtained. An activator is first added to the primary boric acid solution, and then a collector is added. The collector is sodium oleate powder, and the amount of the sodium oleate powder is 0.23 kg / t of the original ore. The activator is calcium lignin sulfonate, and the amount of the calcium lignin sulfonate is 1.02 kg / t of the original ore. Finally, a stirrer is used to fully stir to obtain a secondary boric acid solution; S3: adding sodium hydroxide and hydrochloric acid to the secondary boric acid solution to adjust the pH value of the secondary boric acid solution to 9, wherein the ratio of the amount of sodium hydroxide added to the boric acid content in the secondary boric acid solution is 2:1; S4: Continuously and quantitatively adding starch into the secondary boric acid solution, so that boric acid and starch molecules undergo a condensation reaction to form boric acid cross-linked starch and continuously generate bubbles. The starch addition time is 50 minutes. When the starch is added, the temperature of the secondary boric acid solution is 50° C. The starch needs to be stirred throughout the entire addition process. S5: The collector in the secondary boric acid solution captures the boric acid and is then carried by the bubbles to float to the upper layer of the secondary boric acid solution. The formation of boric acid cross-linked starch and the floating of the boric acid after being captured by the collector occur simultaneously. S6: sodium hydroxide reacts with boric acid cross-linked starch to form a functional group, thereby obtaining a boric acid cross-linked starch hydroxyl material; S7: collecting the foam on the upper layer of the secondary boric acid solution and drying it to obtain boric acid, then filtering the secondary boric acid solution to obtain a boric acid cross-linked starch hydroxyl material precipitate, and washing and drying the boric acid cross-linked starch hydroxyl modified material to obtain the boric acid cross-linked starch hydroxyl modified material.

[0024] The boric acid concentration in the remaining boric acid mother liquor of this embodiment is 0.17%.

[0025] Example 3 The present invention provides a flotation process for improving boron yield, the steps are as follows: S1: crushing the boron ore and grinding it to obtain boron ore powder, the boron ore is crushed and ground to a particle size of 80 mesh, and then water is added to the blender to form a slurry with a weight percentage concentration of 60%; S2: After filtering the ore pulp, a primary boric acid solution is obtained. An activator is first added to the primary boric acid solution, and then a collector is added. The collector is sodium oleate powder, and the amount of the sodium oleate powder is 0.50 kg / t of the original ore. The activator is calcium lignin sulfonate, and the amount of the calcium lignin sulfonate is 2.00 kg / t of the original ore. Finally, a stirrer is used to fully stir to obtain a secondary boric acid solution. S3: adding sodium hydroxide and hydrochloric acid to the secondary boric acid solution to adjust the pH value of the secondary boric acid solution to 10, wherein the ratio of the amount of sodium hydroxide added to the boric acid content in the secondary boric acid solution is 2:1; S4: Continuously and quantitatively adding starch into the secondary boric acid solution, so that boric acid and starch molecules undergo a condensation reaction to form boric acid cross-linked starch and continuously generate bubbles. The starch addition time is 60 minutes. When the starch is added, the temperature of the secondary boric acid solution is 65° C., and the starch needs to be stirred throughout the entire process. S5: The collector in the secondary boric acid solution captures the boric acid and is then carried by the bubbles to float to the upper layer of the secondary boric acid solution. The formation of boric acid cross-linked starch and the floating of the boric acid after being captured by the collector occur simultaneously. S6: sodium hydroxide reacts with boric acid cross-linked starch to form a functional group, thereby obtaining a boric acid cross-linked starch hydroxyl material; S7: collecting the foam on the upper layer of the secondary boric acid solution and drying it to obtain boric acid, then filtering the secondary boric acid solution to obtain a boric acid cross-linked starch hydroxyl material precipitate, and washing and drying the boric acid cross-linked starch hydroxyl modified material to obtain the boric acid cross-linked starch hydroxyl modified material.

[0026] The boric acid concentration in the remaining boric acid mother liquor of this embodiment is 0.34%.

[0027] So far, the present embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present invention.

[0028] It should be noted that the implementation methods not shown or described in the drawings or the text of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments.

[0029] It should also be noted that this article may provide demonstrations of parameters containing specific values, but these parameters do not need to be exactly equal to the corresponding values, but can be approximated to the corresponding values ​​within an acceptable error tolerance or design constraint. In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the desired design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0030] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flotation process for improving boron yield, characterized in that: Here are the steps: S1: crushing the boron ore and grinding it to obtain boron ore powder, and then adding water to form a slurry with a weight percentage concentration of 30-60%; S2: After filtering the ore pulp, a primary boric acid solution is obtained, an activator is first added to the primary boric acid solution, and then a collector is added, and finally a stirrer is used to fully stir the solution to obtain a secondary boric acid solution; S3: adding sodium hydroxide and hydrochloric acid to the secondary boric acid solution to adjust the pH value of the secondary boric acid solution; S4: continuously and quantitatively adding starch into the secondary boric acid solution, and then controlling the reaction temperature and time to allow boric acid to react with starch molecules to form boric acid cross-linked starch and continuously generate bubbles; S5: The collector in the secondary boric acid solution captures the boric acid and floats it to the upper layer of the secondary boric acid solution; S6: sodium hydroxide reacts with boric acid cross-linked starch to form a functional group, thereby obtaining a boric acid cross-linked starch hydroxyl material; S7: collecting the foam on the upper layer of the secondary boric acid solution and drying it to obtain boric acid, and then filtering the secondary boric acid solution to obtain a boric acid cross-linked starch hydroxyl material precipitate.

2. A flotation process for improving boron yield according to claim 1, characterized in that: In step S1, the boron ore is crushed and ground to a particle size of 30 to 80 meshes, and then water is added to prepare the slurry in a mixer.

3. A flotation process for improving boron yield according to claim 1, characterized in that: In the step S2, sodium oleate powder is used as a collector, and calcium lignin sulfonate is used as an activator. The amount of the sodium oleate powder is 0.02-0.50 kg / t of the original ore, and the amount of the calcium lignin sulfonate is 0.02-2.00 kg / t of the original ore.

4. A flotation process for improving boron yield according to claim 1, characterized in that: In step S3, the pH value of the secondary boric acid solution is adjusted to 8.5-10.

5. A flotation process for improving boron yield according to claim 1, characterized in that: The time for adding starch in step S4 is 40-60 minutes, and the temperature of the secondary boric acid solution is 45-65° C. when the starch is added.

6. A flotation process for improving boron yield according to claim 1, characterized in that: The formation of the boric acid cross-linked starch in step S4 and the floating of the boric acid after being captured by the collector in step S5 occur simultaneously.

7. A flotation process for improving boron yield according to claim 1, characterized in that: The ratio of the amount of sodium hydroxide added in step S3 to the boric acid content in the secondary boric acid solution is 2:

1.

8. A flotation process for improving boron yield according to claim 1, characterized in that: In step S7, the boric acid cross-linked starch hydroxyl material precipitate is washed and dried to obtain the boric acid cross-linked starch hydroxyl modified material.

9. A flotation process for improving boron yield according to claim 1, characterized in that: In step S4, starch is added and stirred simultaneously.

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