Major provinces of quartzite in China The darling of quartz industry - high purity quartz sand High-purity quartz is the raw material of high-grade quartz products and the material basis of high-end products in the silicon industry. It is widely used in photovoltaic, electronic information, optical communication and electric light source industries, and plays an important role in the strategic emerging industries of new materials and new energy. . High-purity quartz is a general term for quartz series products with SiO 2 purity greater than 99.9%. The product grade can be divided according to the purity of SiO 2 , that is, the low end W ( SiO 2 ) ≥ 99.9% (3N), the middle end W ( SiO 2 ) ≥ 99.99% (4N), and the high end W ( SiO 2 ) ≥ 99.998% ( 4N8); can also be divided according to the total amount of impurity elements such as Al, B, Li, K, Na, Ca, Mg, Ti, Fe, Mn, Cu, Cr, Ni, etc., that is, the low end ≤ 10000 × 1 0 - 6 , the middle end ≤ 1 00 × 10 -6 , the high end ≤ 20 × 10 -6 . Each grade of high-purity quartz can be classified into 40-80 mesh, 80-140 mesh, 80-200 mesh, and 80-300 mesh by particle size. China has a large population and abundant industries. The demand for high-purity quartz is also very large. The industries such as photovoltaics, electronic information and high-end electric light sources have great demand for high-purity quartz. We know that it is not easy to turn quartz into high-purity quartz for photovoltaic industry. Quartz is not directly used for mining. It needs to be transformed into a series of processes. When quartz sand is used in production. Must be acid washed to reduce the iron content of quartz sand. High-purity quartz sand pickling two or three things! Pickling is mainly to eliminate quartz sand raw material quartz stone, diatomaceous earth carrier surface adsorption, reduce chromatographic peak delamination carrier needs to be pickled before production and processing. The pickling method is divided into single acid pickling and mixed acid pickling. Commonly used acids include sulfuric acid, hydrochloric acid, nitric acid and hydrofluoric acid. The principle is to use quartz which is insoluble in acid (except hydrofluoric acid), and other impurity minerals can be dissolved by acid, thereby realizing a chemical treatment method for further purifying the siliceous raw material. Pickling and purifying will produce a large amount of wastewater containing acid, high salinity, high chroma and high turbidity, especially fluorine-containing wastewater. If it is not properly treated, it will inevitably cause serious environmental pollution. Quartz sand pickling wastewater generally contains hydrogen ions, fluoride ions, solid suspended matter, heavy metal ions, etc. The difficulty in processing is how to effectively remove fluoride ions! The house leaks and the environmental protection of the night rain strikes What should companies do when “pickling†hits “environmental protection� When "pickling" meets "environmental protection", it is simply that the Chinese version of the mother-in-law meets the mother, and both sides have a rationale to follow. This is simply a difficult one. It is necessary to pickle and protect the environment. It requires both benefits and the environment. Enterprises can only sit on their hands and do nothing. The answer is of course NO! ! ! Need to find a balance point from it. Many people may have questions: Since the degree of harm in pickling is so great, why not abandon this method and improve it with a new process. However, for the current degree of technological development, it is unlikely that the technology that wants to open up new methods will be small. In addition to causing pollution, pickling is excellent for removing iron from quartz sand. to sum up Xiao Bian believes that it takes two roads ( national master + enterprise to control ) First, the state should establish clear technical specifications and construction standards for pickled quartz sand. In the past, due to the lack of clear definition by the state, coupled with the self-discipline of enterprises and individuals, the pickling pollution was serious. However, since 2017, after the 263 special action was launched in Jiangsu Province, the acid-washed quartz sand enterprises have better sounded the alarm. As a national quartz sand, Donghai County is known as the “Crystal Capital†in China and abroad. Implementation in the province, the construction of high-quality closed structure plant, exhaust gas collection tower, pickling treatment station and rain and sewage diversion ditch. It is reported that the concentration area needs to invest 6 million yuan to complete the upgrade of the plant and equipment, and the discharge of waste gas will reach the standard. In mid-March 2017, the “Donghai County Pickled Quartz Sand Concentration Area Upgrade and Renovation Work Plan†was issued. The program is based on the long-term, and has developed a high-standard plan for the pickling quartz sand industry, and proposed to implement the acid-washed quartz sand concentration area upgrade in stages. At the same time, it is determined to take the initiative to eliminate and actively close the concentration zone that does not meet the requirements of rectification, which brings new directions and hopes to the development of the pickled quartz sand industry in Donghai County. Second, companies must be willing and willing to take care of the overall situation. Most companies are not unaware of the dangers of pickling, but they are still in danger. Xiaobian believes that the main determinant is funding. The investment in environmental protection equipment needs 6 million yuan, which is a big investment for enterprises. Xiao Bian believes that individual enterprises still have to proceed from the overall situation, and they must not be greedy for their cheapness. Instead, they will suffer big losses, and public and private interests are unfavorable actions. Some content has reference Lifting Point,Lifting D Rings,Hoist Ring,Swivel Hoist Ring Shandong Shenli Rigging Co.,LTD. , https://www.shenliriggingcn.com
High-purity quartz: When “pickling†hits “environmental protectionâ€, the company has already entered the valley?
Quartz sand is a quartz particle crushed by quartz stone, also known as silica. It is a hard, wear-resistant and chemically stable silicate mineral. Its main mineral component is SiO 2 , which is an important industrial mineral raw material widely used in glass, casting, ceramic and refractory materials, smelting ferrosilicon, metallurgical solvent, metallurgy, construction, chemical, plastic, rubber, abrasive and other industries. The harm caused by pickling is obvious to all. For this reason, all units are closely deployed to minimize the damage caused by pickling. The word "environmental protection" is already the scorpion of our ear, and it will be taken for a moment. With the advancement of time, environmental protection work has gradually entered a good situation and achieved certain results. However, for the positive conflict between the economic benefits brought by the pickling and purification of quartz sand and the ecological benefits brought by the treatment environment, how should the enterprises sandwiched in the middle survive?