Method for removing clausena lansium mineral particles in quartz sand in acid-free environment

Abstract

The invention discloses a method for removing clausena lansium mineral particles in quartz sand in an acid-free environment. Belongs to the technical field of mineral purification. According to the invention, dangerous chemicals such as sulfuric acid, hydrofluoric acid and the like which must be used in the traditional process are completely abandoned, the generation of acidic wastewater and waste gas is eliminated from the source, and environmental protection pain points and potential safety and health hazards faced by the industry are solved; through the synergistic effect of magnetic separation, flotation and color separation, iron minerals can be effectively removed, and an excellent removal effect is also achieved on aluminosilicate gangue minerals which are difficult to treat through traditional acid pickling; according to the method, no acid liquor is used, and expensive and complex acid neutralization, wastewater treatment links and equipment corrosion prevention investment are omitted; in conclusion, the method provided by the invention does not need strong acid intervention, is environment-friendly, low in cost and good in purification effect, solves the long-term core difficulty of the industry, and has important application value.

Description

Technical Field

[0001] This invention belongs to the field of mineral purification technology, specifically, it relates to a method for removing yellow-skinned mineral particles from quartz sand under an acid-free environment. Background Technology

[0002] Quartz sand is an important raw material for industries such as glass, ceramics, electronics, and photovoltaics, and its purity directly affects the performance and quality of the final product. Natural quartz sand often contains impurities known as "yellow-skinned mineral particles," mainly including iron-stained quartz particles and aluminosilicate minerals such as feldspar and pebbles. These impurities, containing elements such as iron and aluminum, significantly reduce the whiteness and chemical stability of the quartz sand, thus affecting its application in high-end fields.

[0003] Currently, the most widely used industrial method for removing yellow-skinned mineral particles is acid treatment, including acid scrubbing and acid leaching. This method typically uses strong acid media such as sulfuric acid or hydrofluoric acid to soak or stir the quartz sand at high or normal temperatures. The acid dissolves metal oxides such as iron and aluminum on the surface of the particles, thereby removing impurities. Although this method can improve the whiteness of quartz sand to some extent, it has the following significant drawbacks: This method requires the introduction of sulfuric acid or even hydrofluoric acid, which generates a large amount of acidic wastewater and waste gas, making treatment difficult and costly, and easily causing soil and water pollution, resulting in enormous environmental pressure; furthermore, the use of strong acids is highly corrosive to equipment, posing safety hazards during operation and threatening the health of workers; in addition, the acid solution requires subsequent neutralization treatment, and the equipment needs to be manufactured with corrosion-resistant materials, resulting in high overall operating and maintenance costs. Therefore, developing a quartz sand purification method that does not require strong acid intervention, is environmentally friendly, removes all impurities, and has a simple process has become a pressing technical challenge in this field. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for removing yellow mineral particles from quartz sand in an acid-free environment.

[0005] The objective of this invention can be achieved through the following technical solutions: A method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions, comprising the following steps: A1. Natural quartz ore is crushed and ground into sand, and then classified by a screening machine to obtain quartz sand to be purified. It is then added to a magnetic separator for magnetic separation to obtain magnetically separated fine sand. A2. After the magnetically separated fine sand is fed into the flotation machine, a flotation collector is added under neutral conditions to carry out reverse flotation. After the yellow skin mineral particles are floated out, they are dried to obtain flotation fine sand. A3. The flotation concentrate is fed into a color sorter for color sorting. The yellow mineral particles are screened out by relying on the color difference to obtain the final quartz concentrate.

[0006] Furthermore, the magnetic separator is a high-gradient periodic magnetic separator.

[0007] Furthermore, the graded quartz sand has a particle size greater than 0.074 mm and less than 2 mm.

[0008] Furthermore, the magnetic separation is divided into two stages: the field strength of the first stage is 1.0T-1.3T, and the field strength of the second stage is 1.4T-1.7T.

[0009] Furthermore, the flotation collector is one or more of sodium oleate, oxidized paraffin soap, dodecyltetradecoxypropylpropylene diamine, tetradecyl dimethyl tertiary amine, and myristyl dimethyl tertiary amine.

[0010] Furthermore, the amount of the flotation collector used is 100-300 g / t.

[0011] Furthermore, the concentration of the flotation is 25-35%.

[0012] Furthermore, the drying temperature is 70-80℃, and the drying time is 6-12 hours.

[0013] Furthermore, the color sorting uses a vertical double-layer color sorter.

[0014] Furthermore, the ratio of concentrate to tailings in the color sorting is 10-20:1.

[0015] This invention achieves impurity removal through three steps: magnetic separation, flotation, and color sorting. Magnetic separation, as a pretreatment step, utilizes magnetic differences to efficiently remove most of the strongly magnetic yellow mineral particles (especially ferrous minerals), providing pre-purified material for subsequent processes and reducing the burden on later stages. Flotation, using a specific collector, effectively removes both ferrous-stained quartz particles and key aluminosilicate gangue minerals (such as feldspar), solving the problem of poor removal of the latter by traditional acid washing methods. Finally, color sorting, utilizing color differences, precisely removes any yellow impurity particles that may remain from the first two steps, further purifying the product and ensuring the final product achieves extremely high whiteness.

[0016] The beneficial effects of this invention are: 1. This invention completely eliminates the use of hazardous chemicals such as sulfuric acid and hydrofluoric acid in traditional processes, thereby eliminating the generation of acidic wastewater and waste gas at the source and solving the environmental pain points and safety and health hazards faced by the industry. 2. Through the synergistic effect of "magnetic separation-flotation-color sorting", this invention can not only effectively remove iron minerals, but also has an excellent removal effect on aluminosilicate gangue minerals that are difficult to treat by traditional acid washing. 3. This invention eliminates the need for acid, saving the expensive and complex acid neutralization, wastewater treatment, and equipment corrosion protection costs. In summary, the method of the present invention does not require the intervention of strong acids, is environmentally friendly, has low cost, and has good purification effect, solving a long-standing core dilemma in the industry and possessing significant application value. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 A method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions, comprising the following steps: A1. Natural quartz ore is crushed and ground into sand, and then classified using a screening machine (particle size greater than 0.1 mm and less than 1 mm) to obtain quartz sand to be purified. This sand is then added to a high-gradient periodic magnetic separator for magnetic separation. The magnetic separation has two stages: the field strength of the first stage is 1.2 T, and the field strength of the second stage is 1.5 T, to obtain magnetically separated refined sand. A2. After the magnetically separated fine sand is fed into the flotation machine, oxidized paraffin soap and myristyl dimethyl tertiary amine (200g / t, mass ratio of the two is 1:1) are added under neutral conditions for reverse flotation (concentration of 30%). After the yellow skin mineral particles are floated out, they are dried at 80℃ for 12h to obtain flotation fine sand. A3. The flotation concentrate is fed into a vertical double-layer color sorter for color sorting (the ratio of concentrate to tailings is 20:1). The yellow mineral particles are screened and removed by relying on the color difference to obtain the final quartz concentrate.

[0019] Example 2 A method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions, comprising the following steps: A1. Natural quartz ore is crushed and ground into sand using a crushing-grinding process, and then classified using a screening machine (particle size greater than 0.1 mm and less than 0.8 mm) to obtain quartz sand to be purified. This sand is then fed into a high-gradient periodic magnetic separator for magnetic separation. The magnetic separation has two stages: the field strength of the first stage is 1.0 T, and the field strength of the second stage is 1.4 T, to obtain magnetically separated refined sand. A2. After the magnetically separated fine sand is fed into the flotation machine, dodecyltetradecoxypropylpropanediamine and sodium oleate (150g / t, mass ratio of 1:1) are added under neutral conditions for reverse flotation (concentration of 28%). After the yellow skin mineral particles are floated out, the sand is dried at 70℃ for 6 hours to obtain the flotation fine sand. A3. The flotation concentrate is fed into a vertical double-layer color sorter for color sorting (the ratio of concentrate to tailings is 10:1). The yellow mineral particles are screened and removed by relying on the color difference to obtain the final quartz concentrate.

[0020] Example 3 A method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions, comprising the following steps: A1. Natural quartz ore is crushed and ground into sand, and then classified using a screening machine (particle size greater than 0.074mm and less than 0.6mm) to obtain quartz sand to be purified. This sand is then fed into a high-gradient periodic magnetic separator for magnetic separation. The magnetic separation has two stages: the field strength of the first stage is 1.3T, and the field strength of the second stage is 1.7T, to obtain magnetically separated refined sand. A2. After the magnetically separated fine sand is fed into the flotation machine, sodium oleate and dodecyltetradecyloxypropylpropanediamine (300g / t, mass ratio of 1:1) are added under neutral conditions for reverse flotation (concentration of 35%). After the yellow skin mineral particles are floated out, the sand is dried at 80℃ for 12h to obtain flotation fine sand. A3. The flotation concentrate is fed into a vertical double-layer color sorter for color sorting (the ratio of concentrate to tailings is 20:1). The yellow mineral particles are screened and removed by relying on the color difference to obtain the final quartz concentrate.

[0021] Comparative Example The only difference between this comparative example and Example 1 is that the flotation process in step A2 is replaced by a traditional acid washing process to obtain quartz concentrate.

[0022] The data comparison between Embodiment 1 and the comparative example of the present invention is shown in Table 1: Table 1 As can be seen from the data in Table 1, the whiteness of the quartz sand purified in Example 1 of the present invention is higher than that of the comparative example (traditional acid washing process). Therefore, the method of the present invention does not require the intervention of strong acid, is environmentally friendly, and has a good purification effect, thus having important application value.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions, characterized in that, Includes the following steps: A1. Natural quartz ore is crushed and ground into sand, and then classified by a screening machine to obtain quartz sand to be purified. It is then added to a magnetic separator for magnetic separation to obtain magnetically separated fine sand. A2. After the magnetically separated fine sand is fed into the flotation machine, a flotation collector is added under neutral conditions to carry out reverse flotation. After the yellow skin mineral particles are floated out, they are dried to obtain flotation fine sand. A3. The flotation concentrate is fed into a color sorter for color sorting. The yellow mineral particles are screened out by relying on the color difference to obtain the final quartz concentrate.

2. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The magnetic separator is a high-gradient periodic magnetic separator.

3. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The graded quartz sand has a particle size greater than 0.074 mm and less than 2 mm.

4. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The magnetic separation process consists of two stages: the field strength of the first stage is 1.0T-1.3T, and the field strength of the second stage is 1.4T-1.7T.

5. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The flotation collector is one or more of sodium oleate, oxidized paraffin soap, dodecyltetradecoxypropylpropylene diamine, tetradecyl dimethyl tertiary amine, and myristyl dimethyl tertiary amine.

6. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The amount of the flotation collector used is 100-300 g / t.

7. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The concentration of the flotation is 25-35%.

8. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The drying temperature is 70-80℃, and the time is 6-12 hours.

9. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The color sorting uses a vertical double-layer color sorter.

10. The method for removing yellow-skinned mineral particles from quartz sand under acid-free conditions according to claim 1, characterized in that, The ratio of concentrate to tailings in the color sorting is 10-20:1.

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