Method for producing high-purity quartz sand

A kind of production method of glass sand

Technical field

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The invention belongs to the deep process technology of quartz sand, relate in particular to a kind of production method of glass sand.

Background technology

Quartz sand claims again silica sand, is a kind of common nonmetalliferous ore raw material, and its Application Areas is very extensive.Quartz sand ore dressing purification and the deep processing development of China utilize more lately, and are mainly used in building industry, glass manufacture, ceramic industry and foundary industry, and a common ground in these fields is exactly that quartz sand demand is large, raw materials quality requires low.For the high grade quartz sand in some places of production of China, substantially purify or slightly through purifying, can meet industrial sand demand without ore dressing.

At present, the most advanced with the quartz sand ore dressing purification techniques of the U.S. abroad, feature is that industrialization output is large, equipment specialization and production automation degree high, its product developed into for the 6th generation (impurity total mass mark is less than 8 × 10-6, and transparency is optical grade).The high-tech areas such as aerospace, atomic energy technology, laser, fiber optic communications, military project are widely used in through the ore dressing high-purity and ultra-pure quartz sand made of purifying.Along with scientific and technical progress, high-tech also will roll up by the demand of silicon, and the increasingly exhausted of mineral crystal resource makes people have to sight to turn on substitute-high-purity and ultra-pure quartz sand of mineral crystal.Therefore, actively seek and promote the progress of quartz sand ore dressing purification techniques, the suitability for industrialized production low-costly and in high volume that realizes purity quartzite, high-purity and ultra-pure quartz sand, to making up the deficiency of mineral crystal resource, meets high-tech silicon demand and has important practical significance.Two sections of patent documentations through retrieval discovery with Topic relative of the present invention, but all there is complex process in the production method in these patent documentations, the problem that production cost is high, if publication number is wherein the high purity quartz sand manufacturing method of CN A, although the quartz sand purity of producing is high, but a word used in place name firing technique of twice, has relatively high expectations to Technology, and general enterprises is difficult to accomplish.

Summary of the invention

The object of this invention is to provide a kind of production method of glass sand, by quartz sand precision work, quartz sand product total impurities is controlled in 10ppm, purity reaches more than 99.99%.

The object of the invention is to be achieved through the following technical solutions, a kind of production method of glass sand, its processing step is:

1, magnetic separation: be 80-100 object quartz sand particles by smashing fineness, adopt dry-type magnetic extractor to carry out primary election, mainly remove garnet, rhombohedral iron ore, limonite, ilmenite and intergrowth particle thereof, suitable magneticstrength should be Oe.

2, flotation: use H 2sO 4adjust agent, pH=2.5&#;3, petroleum sodium sulfonate is made collecting agent. and orange alcohol oil is made pore forming material, is mainly mica and the Fe removing in quartz 2.

3, classification, desliming: the present invention adopts the method that adds dispersion agent effective powerful to clean, to improve scrub effect.The object that adds dispersion agent is the electric repulsion that increases impure mineral and quartz particles surface, strengthen the mutual separating effect of impure mineral and quartz particles, adopt vinylbenzene-vinylformic acid as dispersion agent, when dispersant dosage is 400-500g/t, the scouring time is while being 15-25 minutes, its best results.Employing adds dispersion agent effective powerful and cleans technical process, by obtain-0.6+0.1mm of graded desliming, the Fe in product 20 3drop to below 0.1% Sio from 0.25% of raw ore 2content is also greater than 99%, has obtained good scouring refining effect, and washed ore productive rate is also up to more than 73%.

4, acid leaching, washing: the hot acid agitation leach method that adopts two acidleach two to wash, remove the film iron and iron mineral or the iron-bearing mineral etc. of association in quartz sand that separate silica sand particle surface.Acidleach flow process is: and mixing acid I soaks-washs-and mixing acid II soaks-washs;

5, dry: after two acidleach two washings, dry l5&#;20rain at 100-120 DEG C, just glass sand finally.After tested, Sio2 content reaches 99.99%, Fe content and is&#;2.35ppm.

Describedly in step 4 acid leaching, washing, adopt the hot acid agitation leach method that two acidleach two are washed to be:

1. the proportioning of mixing acid I is HCI:H 2sO 4=0.5:1, acidleach concentration is: quartz: mixing acid: water=100:35:40; Acidleach temperature is 38-42 DEG C, and leaching time is 6-10 hour; Washing after acidleach I, all adopts tap water (washing 3 times).2. mixing acid II is HC1, H 2sO 4, HN0 3, HF, HF concentration is 8-10%, acidleach concentration is: quartz: mixing acid: water: 100:60:50; Acidleach temperature is 45&#;50 DEG C, and leaching time is 4-6 hour; First washing after acidleach II, also wash with tap water. in the time that washings approaches neutrality, then use deionized water wash 3 times.

The invention has the beneficial effects as follows:

By magnetic separation, remove garnet, rhombohedral iron ore, limonite, ilmenite and intergrowth particle thereof; Remove mica and the Fe in quartz by flotation 2; By adding dispersion agent to clean, increase the electric repulsion on impure mineral and quartz particles surface, strengthen the mutual separating effect of impure mineral and quartz particles; Particularly wash through two acidleach two, with acid, the solvency action of iron and other harmful element is separated film iron and iron mineral or the iron-bearing mineral of association in quartz sand of silica sand particle surface.In a word, through above-mentioned strict processing step, produce highly purified quartz sand.Whole production technique is reasonable, and production cost is low.

Embodiment

Embodiment: a kind of production method of glass sand, its processing step is: magnetic separation, flotation, graded desliming, acid leaching, washing, dry, finished product.

1, magnetic separation: be 80-100 object quartz sand particles by smashing fineness, the dry-type magnetic extractor that adopts magneticstrength to should be Oe carries out primary election.

2, flotation: use H 2sO 4adjust agent, pH=2.5&#;3, petroleum sodium sulfonate is made collecting agent. and orange alcohol oil is made pore forming material.

For more information, please visit Quartz Sand Proppant.

3, classification, desliming: the method that the present invention adopts dosing effective powerful to clean, to improve scrub effect.The object that adds dispersion agent is the electric repulsion that increases impure mineral and quartz particles surface, strengthen the mutual separating effect of impure mineral and quartz particles, adopt vinylbenzene-vinylformic acid as dispersion agent, when dispersant dosage is 450g/t, the scouring time is while being 20 minutes, its best results.Adopt dosing effective powerful to clean technical process, by obtain-0.6+0.1mm of graded desliming, the Fe in product 20 3drop to below 0.1% Sio from 0.25% of raw ore 2content is also greater than 99%, has obtained good scouring refining effect, and washed ore productive rate is also up to more than 73%.

4, acid leaching, washing: the hot acid agitation leach method that adopts two acidleach two to wash, remove the film iron and iron mineral or the iron-bearing mineral etc. of association in quartz sand that separate silica sand particle surface.Acidleach flow process is: and mixing acid I soaks-washs-and mixing acid II soaks-washs:

1. the proportioning of mixing acid I is HCI:H 2sO 4=0.5:1, acidleach concentration is: quartz: mixing acid: water=100:35:40; Acidleach temperature is 38-42 DEG C, and leaching time is 8 hours.Washing after acidleach I. all adopt tap water (washing 3 times).2. mixing acid II is HC1, H 2sO 4, HN0 3, HF, HF concentration can not be greater than 10%, acidleach concentration is: quartz: mixing acid: water: 100:60:50; Acidleach temperature is 45&#;50 DEG C, and leaching time is 5 hours; First washing after acidleach II, also wash with tap water. in the time that washings approaches neutrality, then use deionized water wash 3 times.

5, dry: after two acidleach two washings, dry l5&#;20rain at 110 DEG C, just glass sand finally.After tested, Sio2 content reaches 99.99%, Fe content and is&#;2.35ppm.

01

Ore dressing and purification technology for high-purity quartz sand

The target mineral for quartz ore dressing and purification is silicon dioxide. All other minerals are impurities. Quartz ore is often accompanied by impurity minerals such as feldspar, mica, clay, and iron. Therefore, the process principle of quartz purification should try to increase the content of silicon dioxide in the product and reduce the content of these impurity minerals. Quartz is used in different industries with specific quality requirements, so the content of silicon dioxide and impurities in the products is also different. The purification process of quartz sand should meet the needs of different industries as much as possible.

The purification process of quartz sand is mainly divided into two categories: physical and chemical purification and biological purification. Commonly used quartz purification processes include crushing, screening, scrubbing, gravity separation, flotation, magnetic separation, electrostatic separation and acid leaching. The fluid inclusions in quartz sand have a greater impact on the upstream products of quartz sand. In addition to considering the effective removal of harmful minerals such as iron-containing minerals and aluminum-containing minerals during purification, the removal of these fluid inclusions should also be considered.

02

Washing and classifying process of quartz sand

Since there are different degrees of ore slime in quartz sand, it is necessary to wash and grade the quartz sand during the beneficiation process to make the final product meet the corresponding standards. When there are more impurities in the quartz sand and they are contained in finer ore slime, the washing and classifying process can be used to remove the ore slime, and at the same time, the content of impurities such as iron and aluminum in the ore can be reduced. At present, in actual production, silica sand beneficiation plants use drum screens, spiral washers, spiral classifiers, hydraulic classifiers and hydrocyclones to deslim quartz sand.

03

Quartz sand scrubbing process

The purpose of scrubbing is to remove the oxidized film iron on the surface of quartz sand and the muddy impurity minerals adhering to the surface of quartz sand. During scrubbing, the purpose of removing impurities is achieved by using external mechanical force and the collision and friction between the internal particles of quartz sand. In addition, scrubbing can also break up the mineral aggregates, further dissociate the minerals, and then achieve further purification through classification operations. There are two common scrubbing methods: rod scrubbing and mechanical scrubbing. When scrubbing, it is necessary to control the scrubbing concentration and time to avoid additional equipment energy consumption and mineral processing costs.

04

Quartz sand separation process

Gravity separation: A method of removing impurity minerals by utilizing the density difference between impurity minerals and target mineral quartz, and the different movement directions of the two in water or other media. Commonly used equipment for gravity separation and impurity removal include spiral concentrators, spiral chutes and shaking tables.

Magnetic separation: Quartz in quartz sand is a non-magnetic mineral, while impurity minerals such as feldspar, limonite, hematite, ilmenite, biotite, rutile, tourmaline and garnet are weakly magnetic minerals except feldspar, and magnetite is a strong magnetic mineral. Magnetic separation can utilize this difference in magnetism in quartz sand to remove weakly magnetic iron impurity minerals and strongly magnetic iron minerals to achieve the purpose of purification and impurity reduction.

Flotation: When impurities in quartz sand are mostly contained in the ore mud, only washing, scrubbing, graded desludging and magnetic separation cannot achieve the ideal product index. Therefore, in order to further improve the purity of quartz, flotation is often used. Flotation is mainly to remove the iron-containing impurity minerals in the form of impregnation or lens in the quartz particles and the removal of non-magnetic associated minerals such as feldspar, mica, and kaolin.

The above content is a simple introduction to the quartz sand purification technology. For the purification of high-purity quartz sand, using only one purification technology often cannot achieve the ideal index, especially for those quartz sands used in high-tech enterprises. Therefore, the purification of high-purity quartz sand often adopts a process combined with centralized purification technology to achieve excellent indicators.

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