In the production of quartz sand removal of iron, raw materials are first washed and deactivated, and then mechanical scrubbing, magnetic separation, flotation, ultrasonic cleaning and acid leaching are used to remove iron elements in quartz sand and improve the use value of quartz sand. So how much of the quartz sand is most suitable for mineral processing and purification?
The content of Fe2O3 in quartz sand with grain size greater than 60 increases with grain size, and the content of SiO2 decreases with the increase of grain size, and the highest Fe2O3 content in +50 mesh quartz sand is 0.0522%, and the lowest SiO2 content is 98.32%. This is because the size of the grain +50 is larger than the size of the quartz particles. Therefore, there will be a number of quartz particles inside the single quartz sand particles, and the iron inclusion inclusions between the quartz particles are not separated, which leads to the increase of the iron content in the +50 mesh quartz sand.
The content of Fe2O3 in quartz sand with grain size less than 180 increases with the decrease of grain size, and the content of SiO2 decreases with the decrease of grain size, and the highest iron content in -300 mesh quartz sand is 0.0587% (3 times the sample of -200+300 mesh quartz sand), and the lowest SiO2 content is 98.81%. This is mainly because the size of the iron bearing minerals in the quartz stone is generally less than 0.01mm. When quartz stone is ground to 50 m, most of the iron minerals in the impurity phase in the quartz fall off and enter into the -300 mesh quartz sand, which leads to the high iron content in the -300 mesh quartz sand. The above data indicate that the smaller the particle size is, the higher the impurity content. This is also the reason why the quartz sand must be deslimed before mineral processing is purified. In addition, the change of iron content in quartz sand with grain size is that when the grain size of quartz sand is larger than 60 mesh, the iron content increases with the grain size, and the iron content increases with the grain size decreasing when the grain size is less than 180 mesh.
Therefore, in the process of refining quartz sand, first of all, the raw materials are washed and deactivated, and then the quartz grain size is controlled between the -60+180 mesh, which can effectively improve the quality of the products and reduce the content of iron impurities in the quartz sand. For quartz sand with a particle size greater than 60 mesh and a particle size less than 180, magnetic separation can be strengthened, so that the content of iron impurity in quartz sand can be effectively reduced.
At present, the market prospect of quartz sand is vast, which makes the development of deep processing and high purification technology of quartz sand extremely urgent. In this regard, China's powdered network is scheduled to hold "2017 quartz sand fine processing and application technology exchange" at the Kokusai Hotel in Fengyang, Anhui Province, 12-13 December 2017. The purpose of this meeting is to provide a communication platform for quartz sand purification and fine processing technology for the local and domestic quartz sand industry circles, to strengthen the exchange of information in the industry, and to provide high quality solutions for the transformation of enterprise products.