Acid pickling and waste acid treatment process for improving purity of powdery quartz sand

Abstract

The invention provides an acid pickling and waste acid treatment process for improving purity of powdery quartz sand. The process includes the steps: putting the powdery quartz sand in an acid pickling purification device, and using an acid pump for pumping acid pickling solution into the acid pickling purification device, wherein the acid pickling solution is composed of hydrofluoric acid, fluorosilicic acid, oxalic acid and water or composed of fluorosilicic acid, oxalic acid and water; removing the acid pickling solution after acid pickling, and collecting; delivering the powdery quartz sand to a washing device by clear water after acid pickling, washing to neutral, and dewatering to obtain a finished product of powdery quartz sand; transferring waste acid into a neutralization tank for neutralization, delivering into a sedimentation tank by the pump, and allowing calcium fluosilicate and calcium oxalate to precipitate; delivering the clear water into a regulation tank after precipitation to realize pH adjustment for precipitation of iron ions; using oxalic acid or fluorosilicic acid to adjust pH, precipitating calcium fluosilicate and calcium oxalate again, filtering to obtain clear water, and delivering the clear water to a workshop for recycling. The acid pickling and waste acid treatment process for improving purity of the powdery quartz sand has the advantages of remarkable purity improvement and impurity reduction and simplicity and convenience in subsequent treatment.

Description

technical field

[0001] The invention provides a pickling and waste acid treatment process for improving the purity of quartz sand powder, relates to the formulation of pickling solution, pickling purification process and treatment process of waste water after pickling, and belongs to the technical field of non-metallic ore deep processing and environmental protection . Background technique

[0002] Quartz sand is one of the important inorganic non-metallic materials. It is widely used in glass, ceramics, cement, refractory materials and other industries; the grade (purity) and value of quartz sand mainly depend on the metal impurities in the quartz sand itself. The amount of mineral content, especially the content of metal minerals represented by impurity iron, determines the value and use value of quartz sand. In order to effectively reduce the content of iron elements in quartz sand, people generally adopt the method of strong magnetic separation to remove iron in the pro...

Examples

Embodiment 1

[0021] The steps provided in this embodiment are as follows: (1), put the quartz sand powder to be purified into the pickling purification device, use an acid pump to pump the pickling liquid into the pickling purification device and open the pickling purification device In the negative pressure water absorption system, the pickling solution is composed of 10-20% fluosilicic acid, 5-20% oxalic acid and 60-85% water. The quartz sand powder to be purified used in the embodiment of the present invention is the quartz sand powder produced by a certain silica sand company in Anhui, and its composition is as follows (mass fraction) after testing: SiO 2 :99.52%, Al 2 o 3 :1460ppm, Fe 2 o 3 :201ppm, TiO 2 : 49.2ppm, Na 2 0:50.2ppm, K 2 0: 522.8ppm.

[0022] (2) Heat the temperature in the pickling purification device to 60°C, and open the circulation system to circulate the hot pickling solution to dynamically pickle the quartz sand powder. After pickling for 6 hours, remove th...

Embodiment 2

[0029] The steps provided in this embodiment are as follows: (1), put the quartz sand powder to be purified into the pickling purification device, use an acid pump to pump the pickling liquid into the pickling purification device and open the pickling purification device In the negative pressure water absorption system, the pickling solution is composed of 1-10% hydrofluoric acid, 5-20% fluosilicic acid, 3-20% oxalic acid and 50-90% water. The quartz sand powder to be purified used in the embodiment of the present invention is the quartz sand powder produced by a certain silica sand company in Anhui, and its composition is as follows (mass fraction) after testing: SiO 2 :99.52%, Al 2 o 3 :1460ppm, Fe 2 o 3 :201ppm, TiO 2 : 49.2ppm, Na 2 0:50.2ppm, K 2 0: 522.8ppm.

[0030] (2) Heat the temperature in the pickling purification device to 80°C, and open the circulation system to circulate the hot pickling solution to dynamically pickle the quartz sand powder. After picklin...

Embodiment 3

[0037] The steps provided in this embodiment are as follows: (1), put the quartz sand powder to be purified into the pickling purification device, use an acid pump to pump the pickling liquid into the pickling purification device and open the pickling purification device In the negative pressure water absorption system, the pickling solution is composed of 1-10% hydrofluoric acid, 5-20% fluosilicic acid, 3-20% oxalic acid and 50-90% water. The quartz sand powder to be purified used in the embodiment of the present invention is the quartz sand powder produced by a certain silica sand company in Shandong, and its composition is as follows (mass fraction) after testing: SiO 2 :98.69%, Al 2 o 3 :5800ppm, Fe 2 o 3 :1510ppm, TiO 2 : 230ppm, Na 2 0:20.5ppm, K 2 0: 1200ppm.

[0038] (2) Heat the temperature in the pickling purification device to 70°C, and open the circulation system to circulate the hot pickling solution to dynamically pickle the quartz sand powder. After pickl...

technical field

[0001] The invention provides a pickling and waste acid treatment process for improving the purity of quartz sand powder, relates to the formulation of pickling solution, pickling purification process and treatment process of waste water after pickling, and belongs to the technical field of non-metallic ore deep processing and environmental protection . Background technique

[0002] Quartz sand is one of the important inorganic non-metallic materials. It is widely used in glass, ceramics, cement, refractory materials and other industries; the grade (purity) and value of quartz sand mainly depend on the metal impurities in the quartz sand itself. The amount of mineral content, especially the content of metal minerals represented by impurity iron, determines the value and use value of quartz sand. In order to effectively reduce the content of iron elements in quartz sand, people generally adopt the method of strong magnetic separation to remove iron in the pro...

Examples

Embodiment 1

[0021] The steps provided in this embodiment are as follows: (1), put the quartz sand powder to be purified into the pickling purification device, use an acid pump to pump the pickling liquid into the pickling purification device and open the pickling purification device In the negative pressure water absorption system, the pickling solution is composed of 10-20% fluosilicic acid, 5-20% oxalic acid and 60-85% water. The quartz sand powder to be purified used in the embodiment of the present invention is the quartz sand powder produced by a certain silica sand company in Anhui, and its composition is as follows (mass fraction) after testing: SiO 2 :99.52%, Al 2 o 3 :1460ppm, Fe 2 o 3 :201ppm, TiO 2 : 49.2ppm, Na 2 0:50.2ppm, K 2 0: 522.8ppm.

[0022] (2) Heat the temperature in the pickling purification device to 60°C, and open the circulation system to circulate the hot pickling solution to dynamically pickle the quartz sand powder. After pickling for 6 hours, remove th...

Embodiment 2

[0029] The steps provided in this embodiment are as follows: (1), put the quartz sand powder to be purified into the pickling purification device, use an acid pump to pump the pickling liquid into the pickling purification device and open the pickling purification device In the negative pressure water absorption system, the pickling solution is composed of 1-10% hydrofluoric acid, 5-20% fluosilicic acid, 3-20% oxalic acid and 50-90% water. The quartz sand powder to be purified used in the embodiment of the present invention is the quartz sand powder produced by a certain silica sand company in Anhui, and its composition is as follows (mass fraction) after testing: SiO 2 :99.52%, Al 2 o 3 :1460ppm, Fe 2 o 3 :201ppm, TiO 2 : 49.2ppm, Na 2 0:50.2ppm, K 2 0: 522.8ppm.

[0030] (2) Heat the temperature in the pickling purification device to 80°C, and open the circulation system to circulate the hot pickling solution to dynamically pickle the quartz sand powder. After picklin...

Embodiment 3

[0037] The steps provided in this embodiment are as follows: (1), put the quartz sand powder to be purified into the pickling purification device, use an acid pump to pump the pickling liquid into the pickling purification device and open the pickling purification device In the negative pressure water absorption system, the pickling solution is composed of 1-10% hydrofluoric acid, 5-20% fluosilicic acid, 3-20% oxalic acid and 50-90% water. The quartz sand powder to be purified used in the embodiment of the present invention is the quartz sand powder produced by a certain silica sand company in Shandong, and its composition is as follows (mass fraction) after testing: SiO 2 :98.69%, Al 2 o 3 :5800ppm, Fe 2 o 3 :1510ppm, TiO 2 : 230ppm, Na 2 0:20.5ppm, K 2 0: 1200ppm.

[0038] (2) Heat the temperature in the pickling purification device to 70°C, and open the circulation system to circulate the hot pickling solution to dynamically pickle the quartz sand powder. After pickl...