Quartz sand pickling solution activator, preparation method thereof and pickling method

Abstract

The application provides a quartz sand pickling solution activator, a preparation method thereof and a pickling method. The quartz sand pickling solution activator comprises hydrogen fluoride, oxalic acid and an activator, wherein the activator comprises iron powder. When the quartz sand pickling solution activator is used for pickling of quartz sand, the cost is low, the amount is small, the pickling reaction effect can be promoted, and the product quality is improved. In addition, the use method is simple, and the use process is safe. The application further provides a preparation method of the quartz sand pickling solution activator and a pickling method.

Description

Technical Field

[0001] This invention belongs to the field of quartz sand technology, specifically relating to an activator for quartz sand pickling solution, its preparation method, and the pickling method. Background Technology

[0002] Quartz sand is quartz particles produced by crushing and processing quartz stone. It is an important industrial mineral raw material, a non-hazardous chemical, and is widely used in glass, casting, ceramics and fireproofing materials, ferrosilicon smelting, metallurgical flux, metallurgy, construction, chemical industry, plastics, rubber, abrasives, filter media, and other industries.

[0003] In recent years, the domestic photovoltaic industry has developed rapidly, leading to a surge in demand for ultra-white quartz sand. Ultra-white sand processing enterprises are now facing the problem of increasingly depleted high-grade raw ore resources, making the quartz sand acid washing process imperative. The core technologies of quartz sand acid washing include feeding, acid introduction, heating, and acid discharge. The main factors affecting the acid washing results include: feed rate, acid composition, reaction time, reaction temperature, and catalyst. How to improve reaction efficiency, increase output, and reduce costs by controlling relevant reaction conditions during production is a key issue that the industry urgently needs to address.

[0004] Quartz sand pickling solution is an acidic solution used to remove impurities, contaminants, and organic matter from quartz sand. Pickling solutions are frequently used in mining, metallurgy, glass manufacturing, and other industrial applications. However, there are some problems and potential hazards associated with the use and handling of quartz sand pickling solutions, including: (1) Corrosivity: Quartz sand pickling solutions are highly corrosive chemicals. Hydrofluoric acid and sulfuric acid can cause serious damage to the skin, eyes, and respiratory tract. Therefore, strict safety measures are required during use, including wearing protective equipment, ensuring good ventilation, and providing emergency treatment equipment; (2) Environmental impact: Special equipment and measures are needed to treat waste pickling solutions to avoid environmental pollution from acidic wastewater. This may require neutralization and treatment measures to reduce the concentration of acidic substances in the wastewater; (3) Waste quartz sand pickling solution is usually classified as hazardous waste and is subject to strict waste management regulations for supervision and treatment; (4) Personnel using and handling quartz sand pickling solution need to receive specialized training to understand the hazards of chemicals, safe operating procedures and emergency response measures; (5) Equipment and containers used to store pickling solution must be highly resistant to chemicals to prevent leakage and corrosion; (6) Long-term exposure to pickling solution or inhalation of its vapors may cause serious health hazards, including respiratory problems and tooth erosion.

[0005] Existing quartz sand pickling solutions can cause severe corrosion to equipment, and the evaporation of the acid can pollute the air and increase production costs. Therefore, it is necessary to develop a more environmentally friendly quartz sand pickling solution activator that can reduce the corrosion of equipment by the acid while also having a lower cost. Summary of the Invention

[0006] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. To this end, the present invention provides a quartz sand pickling solution activator that can reduce the corrosion of equipment by acid while also having a lower cost.

[0007] The present invention also provides a method for preparing an activator for quartz sand pickling solution.

[0008] The present invention also provides a method for acid washing of quartz sand.

[0009] A first aspect of the present invention provides an activator for quartz sand pickling solution, comprising hydrofluoric acid, oxalic acid, and an activator, wherein the activator comprises iron powder.

[0010] One of the technical solutions of the present invention concerning the activator of quartz sand pickling solution has at least the following beneficial effects:

[0011] The acid solutions used in the quartz sand pickling industry are primarily mixtures of hydrofluoric acid and oxalic acid. Hydrofluoric acid corrodes the silicon-containing materials on the surface and in the crevices of the sand grains, exposing some iron-containing substances. Subsequently, oxalic acid undergoes a complexation reaction with the iron-containing substances, reducing the iron content in the sand grains. Therefore, the concentrations of hydrofluoric acid and oxalic acid in the acid solution play a decisive role in the reaction effect. However, high concentrations of hydrofluoric acid and oxalic acid can cause severe corrosion to equipment, pollute the air with acid evaporation, and increase production costs. Therefore, there is a need to develop a more environmentally friendly quartz sand pickling solution activator that can reduce the corrosive effects of the acid solution on equipment while also being more cost-effective.

[0012] The quartz sand pickling solution activator of the present invention is low in cost and requires a small amount, but can promote the pickling reaction effect and improve product quality.

[0013] The quartz sand pickling solution activator of the present invention is simple to use and safe to use.

[0014] According to some embodiments of the present invention, the solvent in the quartz sand pickling solution activator of the present invention is water.

[0015] According to some embodiments of the present invention, the amount of hydrofluoric acid added to the activator of the quartz sand pickling solution is 0.5% to 1.5% by mass percentage.

[0016] According to some embodiments of the present invention, the amount of hydrofluoric acid added to the activator of the quartz sand pickling solution is 0.8% to 1.2% by mass percentage.

[0017] According to some embodiments of the present invention, the amount of oxalic acid added to the activator of the quartz sand pickling solution is 2% to 10% by mass percentage.

[0018] According to some embodiments of the present invention, the amount of oxalic acid added to the activator of the quartz sand pickling solution is 4% to 6% by mass percentage.

[0019] According to some embodiments of the present invention, the amount of activator added in every 100 mL of the quartz sand pickling solution activator is 0.01 g to 0.05 g.

[0020] According to some embodiments of the present invention, the amount of activator added in every 100 mL of the quartz sand pickling solution activator is 0.02 g to 0.04 g.

[0021] According to some embodiments of the present invention, in the quartz sand pickling solution activator, the amount of hydrofluoric acid added is 1%, the amount of oxalic acid added is 5%, and the amount of iron powder added is 0.01g to 0.03g per 100mL of quartz sand pickling solution activator.

[0022] Therefore, without changing the acid concentration, by adding a low-cost, low-dosage commonly used agent, it is possible to activate the acid, promote its iron removal capacity, improve product quality, and reduce costs.

[0023] A second aspect of the present invention provides a method for preparing the quartz sand pickling solution activator, comprising the following steps: adding the activator to the mixed acid of hydrofluoric acid and oxalic acid, diluting with a solvent to obtain the quartz sand pickling solution activator.

[0024] One technical solution of the present invention relates to a method for preparing an activator for quartz sand pickling solution, which has at least the following beneficial effects:

[0025] The preparation method of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are readily available, the production cost is low, and it is easy to industrialize.

[0026] A third aspect of the present invention provides a method for acid washing of quartz sand, the method comprising the steps of: adding an activator of quartz sand acid washing solution to the quartz sand to be washed, and heating to react.

[0027] One technical solution of the present invention concerning the acid washing method for quartz sand has at least the following beneficial effects:

[0028] The present invention provides a low-cost, low-volume pickling method for quartz sand, which yields high-quality quartz sand products after pickling.

[0029] The acid washing method for quartz sand of the present invention is simple and safe.

[0030] According to some embodiments of the present invention, in the acid washing method of quartz sand, the mass-volume ratio of the quartz sand to be washed to the activator of the quartz sand acid washing solution is 1 to 3:1.

[0031] According to some embodiments of the present invention, in the acid washing method of quartz sand, the mass-volume ratio of the quartz sand to be washed to the activator of the quartz sand acid washing solution is 2:1.

[0032] The mass-to-volume ratio of the quartz sand to be washed to the quartz sand pickling solution activator is 2:1. This can be understood as 150g of quartz sand requiring 75mL of quartz sand pickling solution activator.

[0033] According to some embodiments of the present invention, the temperature of the heating reaction is 60°C to 80°C.

[0034] According to some embodiments of the present invention, the heating reaction time is 10h to 20h. Detailed Implementation

[0035] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0036] In some embodiments of the present invention, a quartz sand pickling solution activator is provided, comprising hydrofluoric acid, oxalic acid, and an activator, wherein the activator comprises iron powder.

[0037] It should be noted that the acid solution used in the quartz sand pickling industry is primarily a mixture of hydrofluoric acid and oxalic acid. Hydrofluoric acid corrodes the silicon-containing substances on the surface and in the crevices of the sand grains, exposing some iron-containing substances. Subsequently, oxalic acid undergoes a complexation reaction with the iron-containing substances, reducing the iron content in the sand grains. Therefore, the concentrations of hydrofluoric acid and oxalic acid in the acid solution play a decisive role in the reaction effect. However, high concentrations of hydrofluoric acid and oxalic acid can cause severe corrosion to equipment, pollute the air with acid evaporation, and increase production costs. Therefore, there is a need to develop a more environmentally friendly quartz sand pickling solution activator that can reduce the corrosive effects of the acid solution on equipment while also having a lower cost.

[0038] It is understood that the quartz sand pickling solution activator of the present invention is low in cost and requires little dosage, and can promote the pickling reaction effect and improve product quality.

[0039] The quartz sand pickling solution activator of the present invention is simple to use and safe to use.

[0040] In some embodiments of the present invention, the amount of hydrofluoric acid added to the activator of the quartz sand pickling solution is 0.5% to 1.5% by mass percentage.

[0041] In some embodiments of the present invention, the amount of hydrofluoric acid added to the activator of the quartz sand pickling solution is 0.8% to 1.2% by mass percentage.

[0042] In some embodiments of the present invention, the amount of oxalic acid added to the activator of the quartz sand pickling solution is 2% to 10% by mass percentage.

[0043] In some embodiments of the present invention, the amount of oxalic acid added to the activator of the quartz sand pickling solution is 4% to 6% by mass percentage.

[0044] In some embodiments of the present invention, the amount of activator added to each 100 mL of quartz sand pickling solution activator is 0.01 g to 0.05 g.

[0045] In some embodiments of the present invention, the amount of activator added to each 100 mL of quartz sand pickling solution activator is 0.02 g to 0.04 g.

[0046] In some embodiments of the present invention, the amount of hydrofluoric acid added to the quartz sand pickling solution activator is 1%, the amount of oxalic acid added is 5%, and the amount of iron powder added is 0.01g to 0.03g per 100mL of quartz sand pickling solution activator.

[0047] Therefore, without changing the acid concentration, by adding a low-cost, low-dosage commonly used agent, it is possible to activate the acid, promote its iron removal capacity, improve product quality, and reduce costs.

[0048] In some embodiments of the present invention, a method for preparing a quartz sand pickling solution activator is provided, comprising the following steps: adding the activator to a mixed acid of hydrofluoric acid and oxalic acid, and diluting it with a solvent to obtain the quartz sand pickling solution activator.

[0049] The preparation method of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are readily available, the production cost is low, and it is easy to industrialize.

[0050] In some embodiments of the present invention, a method for acid washing of quartz sand is provided, the steps of which include: adding an activator of quartz sand acid washing solution to the quartz sand to be washed, and heating to react.

[0051] It is understood that the acid washing method for quartz sand of the present invention has low cost, requires less acid washing solution, and produces high-quality quartz sand products after acid washing.

[0052] The acid washing method for quartz sand of the present invention is simple and safe.

[0053] In some embodiments of the present invention, in the acid washing method of quartz sand, the mass-volume ratio of the quartz sand to be washed to the activator of the quartz sand acid washing solution is 1 to 3:1.

[0054] In some embodiments of the present invention, in the acid washing method of quartz sand, the mass-volume ratio of the quartz sand to be washed to the activator of the quartz sand acid washing solution is 2:1.

[0055] It should be noted that the mass-to-volume ratio of the quartz sand to be washed to the quartz sand pickling solution activator is 2:1. This can be understood as 150g of quartz sand requiring 75mL of quartz sand pickling solution activator.

[0056] In some embodiments of the present invention, the temperature of the heating reaction is 60°C to 80°C.

[0057] In some embodiments of the present invention, the heating reaction time is 10h to 20h.

[0058] The technical solution of the present invention will be better understood below with reference to specific embodiments.

[0059] Example 1

[0060] An activator for quartz sand pickling solution, comprising hydrofluoric acid, oxalic acid and an activator, wherein the activator is iron powder.

[0061] A 100 mL activator for quartz sand pickling solution was prepared, containing 1 mL of hydrofluoric acid, 5 mL of oxalic acid, 0.01 g of iron powder, and water as the solvent.

[0062] Example 2

[0063] An activator for quartz sand pickling solution, comprising hydrofluoric acid, oxalic acid and an activator, wherein the activator is iron powder.

[0064] A 100 mL activator for quartz sand pickling solution was prepared, containing 1 mL of hydrofluoric acid, 5 mL of oxalic acid, 0.02 g of iron powder, and water as the solvent.

[0065] Example 3

[0066] An activator for quartz sand pickling solution, comprising hydrofluoric acid, oxalic acid and an activator, wherein the activator is iron powder.

[0067] A 100 mL activator for quartz sand pickling solution was prepared, containing 1 mL of hydrofluoric acid, 5 mL of oxalic acid, 0.03 g of iron powder, and water as the solvent.

[0068] Comparative Example

[0069] An activator for quartz sand pickling solution, comprising hydrofluoric acid and oxalic acid.

[0070] 100 mL of quartz sand pickling solution activator was prepared, containing 1 mL of hydrofluoric acid, 5 mL of oxalic acid, and water as the solvent.

[0071] Pickling effect test

[0072] Take 75 mL of the activator of the quartz sand pickling solution from the examples and comparative examples respectively, and pickle 150 g of quartz sand respectively.

[0073] Before pickling, the iron content in the quartz sand was measured to be 410 ppm.

[0074] The pickling temperature was 70°C, and the pickling time was 15 hours. After pickling, samples were taken to test the iron content in the sand. The results are shown in Table 1.

[0075] Table 1

[0076] serial number Iron content (ppm) in the quartz sand after the test. Example 1 91 Example 2 93 Example 3 91 Comparative Example 107

[0077] The present invention has been described in detail above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A quartz sand pickling solution activator characterized by, The quartz sand pickling solution activator comprises hydrofluoric acid, oxalic acid and an activator, the hydrofluoric acid is added in the quartz sand pickling solution activator in an amount of 0.5-1.5% by mass, the oxalic acid is added in the quartz sand pickling solution activator in an amount of 2-10% by mass, and the activator is added in the quartz sand pickling solution activator in an amount of 0.01-0.05 g per 100 mL.

2. The quartz sand pickle liquor activator of claim 1, wherein, The hydrofluoric acid is added in the quartz sand pickling solution activator in an amount of 0.8-1.2% by mass.

3. The quartz sand pickle liquor activator of claim 1, wherein, The oxalic acid is added in the quartz sand pickling solution activator in an amount of 4-6% by mass.

4. The quartz sand pickle liquor activator of claim 1, wherein, The activator is added in the quartz sand pickling solution activator in an amount of 0.02-0.04 g per 100 mL.

5. A method of preparing the quartz sand pickling liquor activator according to any one of claims 1 to 4, characterized in that, The method comprises the following steps: The activator is added into the mixed acid of hydrofluoric acid and oxalic acid, and after dilution with a solvent, the quartz sand pickling solution activator is obtained.

6. A method for pickling quartz sand, characterized by, The quartz sand pickling solution activator according to any one of claims 1-4 is added into quartz sand to be washed, and a temperature rising reaction is carried out.

7. The pickling method according to claim 6, characterized by The temperature rising reaction is carried out at a temperature of 60-80°C; and / or the temperature rising reaction is carried out for a time of 10-20 h.