September 17, 2019

Sand washing plant for extracting quartz sand from river sand

This paper provides a sand washing plant of extracting quartz sand from river sedimentary sand, which can protect the environment and improve economic benefits.
Quartz sand, commonly known as silica sand, is the basic industrial materials for glass, ceramics, refractories and metallurgical casting. The quality requirements of industrial quartz sand are higher, such as SiO2 content for moulding sand >90%, SiO2 content for glass sand >96%, and SiO2 content for daily ceramics and building sanitary ceramics > 98%. At present, the commercial quartz sand is mainly obtained from various quartz deposits through mineral construction, mining, mineral processing and purification. The products of gravity separation of silica sand generally contain SiO2 90-95%, and those of gravity separation of silica sand and electromagnetic separation of silica sand can reach 98%. However, the reserves of quartz ore are limited and new sources of raw materials need to be explored continuously.
river silica sand
The river channel silt originates from the long-term weathering of bedrock, and is composed of hard rock, ore gravel and clay through mountain torrent erosion and rolling deposition. In general, there are different amounts of non-metal (quartz, clay, diamond, etc.) and metal (magnetite, ilmenite, placer gold, etc.) mineral raw materials in river silt, especially the content of quartz sand in silt is generally more than 50%, and its reserves are endless. However, due to the complex composition of silt, the content of SiO2 does not meet the requirements of industrial deposits, and is currently only used as building materials, even because of the non-uniform particle size. The technology of extracting industrial quartz sand from river silt has been put on the agenda.

Using abundant River silt and simple sand washing plant process for solid material separation, the main production of industrial quartz sand and other mineral raw materials, so as to achieve comprehensive utilization of river silt.

The raw materials used in the production process of quartz sand are river silt, including river silt of large and small rivers, river beach silt and reservoir tail silt.
The purpose of quartz sand extraction from this sand washing plant is achieved by seven processes: pulping and screening, weak magnetic separation, gravity separation, slag removal, strong magnetic separation, light sand separation and crude product cleaning.
sand washing plant flowsheet
Pulping and screening
rotary scrubber

The River silt and water are mixed in proportion to a certain weight, and the slurry with the weight of 1.1-1.2g/cm3 is made by the rotary scrubber. Then the slurry is poured into the screening equipment. The screening equipment is a multi-layer vibrating screen. The sieve hole size is 40 mm to 2 mm from top to bottom. The gravel with a diameter of > 2 mm is obtained for construction sand. The material with a diameter of < 2 mm is obtained as the slurry to enter the next step.
Weak magnetic separation
magnetic drum separator
Using CTB magnetic drum separator, the screened slurry was preliminarily selected by weak magnetic separation, and the strong magnetic minerals in the slurry, namely magnetite and ilmenite, were roughly selected to obtain heavy material. Magnetite and ilmenite are collected as by-products and can be used as metallurgical raw materials.
Gravity separation
At least two parallel chutes are used to separate heavy slurry  by rotation. The chute inclination is 2-5%, which results in the stagnation of heavy mineral sand particles with a gravity of over 38g/cm3 on the chute and the suspension of sand particles with a gravity of less than 38g/cm3 in the slurry to obtain light material. Metallic minerals such as iron ore, titanium ore and placer gold are enriched in the silted heavy mineral sand grains, which can be collected as by-products and used to extract precious mineral raw materials such as placer gold, rutile, zircon and monolith.
Slag removal
trommel screen
The light sand slurry was screened with trommel screen to remove sand particles with particle size > 0.9 mm and used as building mortar to obtain mortar with particle size < 0.9 mm.
Strong magnetic separation
A high intensity magnetic separator (high gradient magnetic separator or plate magnetic separator) was used to separate slag-removing sand slurry, remove magnetic sand, and obtain non-magnetic sand pulp with quartz sand as its main component. The content of SiO2 in non-magnetic sand after high intensity magnetic separation is at least 96%, which meets the requirement of general silica sand. The magnetic sand can be used as iron ore sand and construction sand.
high gradient magnetic separator
Light sand separation
Non-magnetic sand slurry is sorted by spiral chute, and a small amount of debris, feldspar, mica and other impurities remaining in the mortar are removed to obtain coarse quartz sand.
After drying the crude quartz sand, grind it to 200 mesh (< 0.074 mm) with quartz sand ball mill, rinse it with water to remove clay dust, then remove acid soluble substances (such as metal residues) with dilute hydrochloric acid, rinse it with water to PH 7, and finally dry it with quartz sand dryer to obtain high-quality quartz sand products.
quartz sand
According to this sand washing plant, quartz sand is extracted by river silt. The product contains more than 98% SiO2, and the recovery rate of quartz sand in silt reaches 70-80%. It can also produce building sand, iron ore, titanium ore and other mineral raw materials, realize the comprehensive utilization of silt, increase its economic value by more than 10 times, and its production cost is higher than that of quartz sand. At the same time, it can solve a lot of problems of channel silt and reservoir tail silt, which is beneficial to dredging of river channel, maintenance of reservoir capacity and improvement of ecological environment along the river, and has significant economic and social benefits.

Suggestion: Comprehensive utilization of resources and environmental protection is an important subject in quartz sand processing.

Lasted news & technology
Mar 04 2020

As the executive part of VSI sand making machine, the service life of the rotor directly determines the maintenance cycle and startup rate of the equipment.

Mar 03 2020

Spiral sand washing machine is an important equipment which is used to washing sand or dewatering.

Mar 01 2020

Sand washing machine is one of important equipments in sand washing plant.

Feb 29 2020

Attrition scrubber as one of the hot-sale machines in sand washing plant.

Feb 26 2020

Widely used equipment in the sand washing plant for muddy water treatment and dewatering process mainly includes: dewatering screen, spiral classifier, hydrocyclone, filter press, ceramic filter, Rotary centrifuge ,desliming cone and so on.

Feb 24 2020

Recently, the production of Sinonine quartz sand processing and sand washing equipment is busy.

Feb 21 2020

A kind of environmental protection quartz sand pickling treatment method.

Jan 06 2020

This paper describes in detail the production process of foundry sand by using natural quartz stone.

Contact us

Thank you for your interests in Sinonine, Please feel free to submit your inquiry information to us, our expert will contact with you as soon as possible.