Introduction
GUOTE glass sand washing plant is is to produce ultra-white Photovoltaic glass quartz sand and float glass quartz sand,The particle size and chemical composition requirements of two kinds of glass quartz sand are as follows:
| Item | SiO2(%) | Fe2O3(%) | Al2O3(%) | Size |
| Photovoltaic glass quartz sand | >99.5 | <0.01 | <0.3 | 0.1-0.6mm>90% |
| Float glass quartz sand | >98.5 | <0.08 | <0.8 | 0.125-0.71mm>90% |
The requirements for raw materials to produce glass quartz sand
There are two main raw materials for producing glass quartz sand, one is lump quartz stone, the other is natural granular silica sand, two kinds of raw materials through a series of processing technology, can produce glass sand to meet the requirements.
Advantages
High product quality
It can effectively reduce the iron content of quartz sand. We have a wealth of experience in quartz sand production lines. The entire process is not only equipped with advanced iron removal equipment, but also controlled at the source to minimize the pollution of sand during processing.
Large quantity
The output is large, the product size is uniform, and the sand formation rate is higher. The entire production process is classified by drum screens, blocked, and classifiers for multiple times, which not only improves the efficiency of the production line, but also reduces the loss of raw ore, and controls the content of tailings.
high degree of automation
The production line process is carefully designed, and the advanced circuit control system is adopted, which not only saves labor but also lowers the operation threshold of the production line
Mature technology, energy saving and environmental protection
High purity and no pollution. Reasonable process equipment is adopted, which greatly saves electricity consumption and realizes zero discharge of sewage and dust
Working Principle
The general process flow is: raw ore----crushing----pre-screening-----grinding----desliming----coarse particle classification----fine particle classification----scrubbing----desliming---- gravity separation----magnetic separation----dewatering---finished Product" If the raw material is granular silica sand, there is no need for crushing and grinding, and it can be directly sent into the subsequent production process. The main purpose of quartz sand processing is to remove clay and other impurities, improve the content of quartz sand, reduce the content of Fe2O3 and impurities, and control the particle size in a certain range. Different raw materials, the use of processing technology will be different, typical glass sand production processing flow is shown as the following figure.
Crushing & Grinding
The lump quartz stone should be crushed into 30mm particle size by jaw crusher and cone crusher, and then into the rod mill for grinding
Cassification
After grinding, the sand slurry enters the hindered settling machine to separate the coarse sand to return to the rod mill for regrinding, and the overflow enters the hydraulic classifier to separate the fine sand. In this way, the sand is separated out of a certain size range through hindered settling machine and hydraulic classifier, and then it can enter the next step of scrubbing and desliming system.
Scrubbing & desliming
The classified quartz sand enters the forced scrubbing machine to fully dissociate the impurities covered on the surface of the quartz sand, effectively removing the residual clay and impurities, and effectively removing the iron oxide material wrapped on the surface of the sand particles.
Magnetic separation
After scrubbing the iron material in sand shall be removed through the magnetic separation system. firstly using magnetic separator with medium magnetic field intensity to remove strong magnetic iron material, and then use high magnetic field intensity magnetic separator to remove weak magnetic iron material. Remove as much iron material as possible from the quartz sand.
Dewatering screen
It is used to wash and dehydrate the ore. Because the water content after the finished product is too high, it needs to be dewatered through a dewatering screen to reduce the water to a controllable range.
Technical Parameters
Typical requirements for quartz sand in the industrial sector
| Application field | chemical composition | granularity | other requirements |
| SiO2 | Al2O3 | Fe2O3 | Upper limit | Main particle size | Lower limit |
| Ordinary float glass | ≥98.5 | ≤0.8 | ≤0.08 | 0.71 | 0.71-0.125 | 0.125 | Refractory heavy minerals |
| Ultra-white photovoltaic glass | ≥99.5 | ≤0.3 | ≤0.01 | 0.6 | 0.6-0.1 | 0.1 | Refractory heavy minerals |
| Quartz glass | ≥99.98 | ≤20ppm | ≤5ppm | 0.30 | 0.3-0.074 | 0.74 | (OH-) content and other impurities |
| Ceramic glaze | ≥99.0 | ≤0.5 | ≤0.05 | 0.074 | 0.074-0.045 | - | Whiteness |
| Chemical packing | ≥99.5 | ≤0.2 | ≤0.03 | 0.05 | 0.05-0.025 | - | Whiteness, surface properties, shape |
| Electrician & Electronics | ≥99.8 | ≤0.10 | ≤0.010 | 0.030 | 0.020-0.005 | - | Ion content, whiteness, shape, surface properties |
| Foundry industry | ≥98.0 | ≤1.0 | ≤0.10 | - | Three sieve ratio≥75% | -0.2 | Shape, mud content, refractoriness |
Requirements of quartz sand for low iron glass (unit: wt%)
| material | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | Na2Co3 | TiO2 | NaCl |
| Quartz sand | ≥98.55 ±0.3 | ≤1.0 ±0.1 | ≤0.01 ±0.001 | - | - | - | ≤0.1 ±0.1 | - |
Quartz sand particle size requirements for low-iron glass production
Particle size | Above 0.5mm | 0.113-0.55mm | ＜0.113mm |
| content | ≤0.5 | ≥94.5 | ≤5.0 |
