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classifying machine for quartz ore good quality

silica sand processing plant - jxsc machine

silica sand processing plant - jxsc machine

High-grade quartz/ silica sand is litter in nature, silica ore contains many kinds of impurity minerals, objectively leads to the difficulty in purifying quartz sand. Silica sand processing plant research does a positive influence on technology for developed high-quality quartz sand products to meet high-tech silicon. The grade of Brazil silica mine ore SiO2 is generally above 93%, and it is currently only used as quartz fertilizer for chemical fertilizers. In order to further improve the utilization value of the quartz sand ore and make it have better economic development and utilization value, on the basis of the research of process mineralogy, the quartz selection exploration test is carried out in order to increase the SiO2 content and reduce the impurities A1203, Fe203 and Ti. The content of the refined quartz sand grade can be selected to provide technical support for improving the utilization value of the mine.

Quartz ore is dominated by SiO2, and the remaining components are very low. Al2O3, K2O and iron are high in content and, in addition, contain a certain amount of CaO, MgO and Na2O, so the main purpose of the purification test is to remove Al2O3, K2O and iron.

The surface of ore is colorless under the naked eye, and the ore structure is mainly blocky. The main mineral is quartz, and the impurity minerals are mainly high-alumina minerals such as clay and potassium feldspar and iron minerals.

Quartz: The main carrier mineral of SiO2 is also the main purpose mineral of the experimental research. Its form and embedding form are simple. The output forms in the ore are mainly the following: (1) Sand: sub-circle-sub-angled Chips, good sorting, particle support, pore-contact cementation, mostly in the form of fine-medium grain sand of 0.1-0.5mm. (2) Siliceous agglomerate: Clay recrystallized product. (3) Increase the edge shape: it is the recrystallized product of silicon matter between quartz crumbs, which is secondary to increase the distribution of quartz crumbs around the edges. Clay, K-feldspar: mainly minerals for K2O and Al2O3, K-feldspar is sub-circular-sub-horny crumb, mostly fine-medium-grained sand of 0.1-0.5mm; amorphous cryptocrystalline is Mainly, partially crystallized into microscopic scale-like hydromica. Hematite: It is an iron mineral in ore that is distributed in the inter-debris pores with 0.002 mm particles.

In order to formulate a reasonable beneficiation process and determine the appropriate grinding fineness, the grain size of quartz in the ore was counted. The results show that the quartz grain size in the sample is concentrated and evenly distributed in fine particles (0.417~0.104mm). The scope of the inlay. In summary, the ore is a fine-medium-grained siliceous quartz sandstone, and the SiO2 content in the ore is only about 93%. As a refined quartz sand raw material, it needs to be purified and used. Clay minerals, potassium feldspar, and particulate iron minerals (hematite, magnetite) produced in the form of intergranular pore interstitials in the ore lead to higher levels of harmful impurities such as Al2O3, K2O and Fe. The grain size of quartz sand in the ore is 0.1-0.5mm, and the fineness of grinding is -0.1m (140 mesh) to ensure that about 60% of the quartz in the ore sample dissociates. Although the ore sample is an optional quartz sandstone ore, the physical properties such as specific gravity of potassium feldspar are similar to those of quartz, and it is difficult to separate from quartz.

The mineralogical study of quartz sand ore shows that impurity minerals mainly exist between the surface of the particles and the cracks of quartz particles. Quartz surface is unclean, distributed with a lot of dusty clay and impurity minerals, mostly secondary cementation, local clay cementation, a very small amount of quartz crystals containing gas-liquid inclusions, other mineral inclusions, but generally within the quartz crystal Basically purer. The impurities of ore mainly come from clay minerals, iron minerals, potassium feldspar, and a small amount of clay derived from the submicroscopic distribution of secondary quartz cement and primary quartz particles. Based on this, the process of grading-wiping mud-acid treatment was selected, and the single-factor beneficiation and purification test of the quartz sand was carried out, and the feasibility of magnetic separation and flotation to remove potassium and aluminum was explored.

the quartz grade doesnt significantly increase under very fine or coarse particle size conditions, when the size is -0.208~+0.104mm, the silica grade increase to 95.06%, besides, the total content of Fe, Al and Ti is also at the smallest point, suggesting that the quartz and impurity minerals are largely separated at the grade. For the economics of the grinding process and the classification effect of grinding, choose -0.208~+0.104mm as the suitable grinding size. quartz rock crusher for sale

Because the acidic medium has good leaching power for Fe, Al, K, etc., but it has no effect on Si. The sample is treated with monoacid (sulfuric acid), and the SiO2 grade up to 99%, and the harmful impurities such as Al2O3 and TFe2O3 are greatly increased. Reduced refined quartz sand, and with the increase of treatment time, the impurity removal rate increased significantly; although hydrofluoric acid (HF) has a certain etch on SiO2, it has been proved by experiments that the mixed acid treatment effect of adding HF under the same conditions Better than monoacid, a reasonable balance can be obtained between the promotion of SiO2 and the reduction of Al2O3 and TFe2O3.

Considering that remove magnetic mineral before acid treatment can reduce the consumption of acid. But test shows that the use of strong magnetic separation cannot achieve the purpose of effective iron removal. The impurities K and Al in the ore are mainly derived from potassium feldspar and clay, silica washing process can remove some clays. in order to do further research, the particle size after deliming treatment is -0.208~+ The 0.104mm sample was subjected to a flotation process exploration test to separate the feldspar and quartz by flotation. The flotation test was carried out by adding a collector under normal temperature (18-20 C) acidic environment.

3.1 Quartz sand beneficiation purification method and process flow are generally considered from three aspects: the occurrence state of impurity minerals in the ore, the ore dressing cost of the purification process, and the industrial use of the fine sand product. Under the premise of satisfying industrial use, Whenever possible, choose a process that is simple in process, low in cost, and easy to implement in an industrial manner. 3.2 Through a reasonable and simple process, the SiO2 in the ore can be purified to more than 99%. The mixed acid treatment effect of adding HF is obviously superior to that of monoacid (sulfuric acid), but the problem of F emission in the leachate needs to be considered. JXSC provides silica sand processing plant equipment, silica washing machine, stone crusher, magnetic separator, flotation, etc. Contact us to know more info about the silica mining process.

quartz ore mining solution - mineral processing

quartz ore mining solution - mineral processing

High-purity quartz is the raw material of high-end quartz products and the material basis of high-end products in the silicon industry. It is widely used in photovoltaics, electronic information, optical communications and electric light sources. It has an important position and role in strategic emerging industries of new materials and new energy.

There are only a few raw ores in the world that can produce high-purity quartz sand for high-tech industries. There are many types of silica resources and large storage capacity. Quartzite, quartz sandstone and vein quartz are the main raw materials for producing high-purity quartz sand.(1) QuartziteQuartzite is a metamorphic rock dominated by quartz. It is formed by the metamorphism of quartz sandstone and siliceous rock, where the silica content is above 85%.(2) Quartz sandstoneQuartz sandstone is a sedimentary rock formed by cementing quartz particles, and its silica content is as high as 95%.(3) Vein quartzVein quartz is formed by filling silicon thermal fluid secreted by underground magma into rock fissures, and its silica content is as high as 99%.

1. Washing-classifying-desiltingIn the quartz sand beneficiation process, the fine-grained grade with a particle size of less than 0.1 mm is usually called slime. For quartz sand with a large amount of clay and ore mud, as the particle size becomes finer, the grade of silica gradually decreases, while impurities such as iron and aluminum rise instead. Using water washing-classifying-desilting method can effectively improve quartz grade.2. ScrubFor the thin film iron and adhesion impurities on the surface of quartz sand, the effect of water washing-grading desilting is poor. This requires the removal of the thin film iron and adhesion impurities suitable for the sand surface by means of mechanical force and the abrasive force between the sand particles. After the grading desilting, a better impurity removal effect can be achieved.3. Gravity separationgravity separation is to screen minerals according to their different gravity. Due to the difference in density, the mineral particles are affected by the fluid force and mechanical force in the medium, resulting in loose stratification, so that the ore particles are separated.4. Magnetic separationMagnetic separation is to separate the magnetic impurity minerals and particles in the quartz sand. The quartz in the quartz sand is a diamagnetic substance, which cannot be magnetized in the magnetic field, and most of the impurities containing Fe and Ti are paramagnetic substances, which can be magnetized, so that the impurities containing Fe and Ti can be removed by magnetic separation High quartz sand content.5. FlotationFlotation is the process of separating mineral particles by different physical and chemical properties on the surface of the mineral particles. The main function is to remove the related mineral mica and feldspar from the quartz sand.The physical beneficiation method can only remove the impurities of mineral structure, and rarely remove the impurities on the surface of quartz sand. The purer the quartz sand, the higher the use value, so it is necessary to further purify the quartz sand after flotation.

The chemical methods for purifying quartz sand are mainly acid leaching or alkali leaching. Compared with physical methods, the cost of chemical methods is higher, but the purification effect is better, especially when the purity of quartz sand is high, chemical purification is more effective.The acids commonly used in acid leaching are sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. Dilute acid has a good effect of removing impurities such as iron, aluminum, and magnesium, while concentrated sulfuric acid and hydrofluoric acid have a good effect of removing impurities of titanium and chromium. Therefore, in the actual beneficiation, mixing acid to purify quartz sand is the best.Compared with general mineral processing engineering, high-purity quartz sand processing technology has the following characteristics:(1) The reagent purity is high. Acid leaching and water washing are important steps in the processing of high-purity quartz sand. Due to the high purity requirements of high-purity quartz and the low content of impurity elements, the purity of the reagents such as acid and water must meet the corresponding requirements, otherwise it is difficult to produce qualified products.(2) The reagent has strong corrosion. Hot acid leaching plays a key role in the purification of high-purity quartz. An important chemical property of quartz is excellent acid corrosion resistance, while other metal impurity components in the ore are generally poor in acid corrosion resistance. Under certain temperature conditions, this effect is more obvious. The acid leaching process used in high-purity quartz processing uses this principle to achieve chemical purification.(3) The material standards are strict. Practice has proved that in the purification of high-purity quartz, materials such as containers that come into contact with the raw materials have a significant impact on the quality of the sample. Strictly controlling the material standards of each processing link of high-purity quartz sand is the key to ensuring quality.

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