High purity quartz sand has extremely strict requirements for Fe ₂ O Ⅲ
content, gas-liquid inclusion quantity, and product whiteness. Some application
scenarios are sensitive to moisture and wet processes are not suitable. Shanlu
Heavy Industry provides a complete set of dry purification production line
equipment from calcination, dry magnetic separation, chlorination to graded
packaging, suitable for the production of high-end products such as photovoltaic
quartz sand, high-purity quartz sand, and electronic grade silicon micro
powder.
Taking the typical dry purification process route as an example: After
crushing and grading the raw ore to 0.5-5mm, it is fed into the calcination
furnace by a feeder for high-temperature heat treatment. The calcination furnace
designed by Shanlu Heavy Industry is a rotary structure, and the furnace tube is
made of heat-resistant stainless steel or corundum material. The working
temperature can be set between 800 ℃ and 1100 ℃. The sand material rolls forward
in the furnace and is uniformly heated, which can cause the gas-liquid
inclusions inside the quartz particles to expand and break due to heat, while
also promoting the diffusion of impurity elements such as iron and aluminum in
the lattice to the surface of the particles. After calcination, the sand
material should be naturally cooled or air-cooled to room temperature to avoid
water quenching and the introduction of moisture. The cooled sand enters the CXG
high field permanent magnet roller magnetic separator for preliminary iron
removal. This device uses rare earth neodymium iron boron magnetic material, and
the magnetic field strength on the roller surface can reach over 12000Gs, which
is suitable for separating weak magnetic impurities in fine particles in dry
materials. The material is evenly distributed onto the surface of the magnetic
roller through a vibrating feeder, and the magnetic particles are adsorbed and
detached with the rotation of the roller, while the non-magnetic quartz sand
falls freely. After CXG magnetic separation, the Fe ₂ O3 content in the sand
material can be reduced to below 80ppm.
For products with higher purity requirements, Shandong Heavy Industry has
added a DCG high field electromagnetic dry magnetic separator for deep scanning
after CXG magnetic separation. The equipment adopts electromagnetic excitation,
and the magnetic field strength can be adjusted by current, up to 18000Gs. The
magnetic separator is equipped with a vibration feeding device and multi-stage
magnetic rollers inside, and the material passes through each level of magnetic
field zone in sequence. Weak magnetic particles are adsorbed and separated step
by step, and non-magnetic sand is collected as the final product. After DCG
magnetic separation, the Fe ₂ O3 content can be further reduced to below
30ppm.
Some high-end high-purity sands still need to remove surface trace impurities
and improve surface properties. Shanlu Heavy Industry is equipped with a
high-temperature chlorination furnace for chlorination treatment. The
chlorination furnace is a rotary structure, and the furnace tube material is
made of high-temperature resistant nickel based alloy, with a working
temperature of 800 ℃ -1100 ℃. The sand material comes into contact with chlorine
gas or chlorinating agent in the furnace, and trace impurities such as iron and
titanium on the surface are converted into volatile chlorides and carried away,
while the surface of the sand particles is passivated. After chlorination
treatment, the whiteness of the sand material can be increased to over 95
degrees.
For scenarios requiring micro powder grade high-purity products, Shanlu Heavy
Industry can configure MQX dry fine powder ball mill for ultrafine grinding, and
obtain narrow particle size products with multiple specifications in the range
of D90=5-45 μ m through QF vertical airflow classifier after discharge. After
classification, the micro powder is subjected to final iron removal by an
electromagnetic dry powder magnetic separator, which is suitable for powder
purification in the range of 10-100 microns and can control the Fe ₂ O3 content
below 20ppm.
In terms of dust removal on the production line, Shanlu Heavy Industry is
equipped with pulse bag dust collectors to centrally collect dust at various
dust points, with emission concentrations below 30mg/m ³. The collected dust can
be used as a byproduct or returned for reprocessing based on its purity.
Shanlu Heavy Industry is located in Shandong and has over 20 years of
experience in designing and manufacturing mining machinery. Its products cover a
full range of categories including calcination, magnetic separation,
chlorination, grinding, grading, and dust removal. Shanlu Heavy Industry can
provide customized services from single machine selection to whole line
integration based on customer requirements for raw ore grade and finished
product purity.
In terms of equipment details, the calcination furnace cylinder adopts a
high-temperature resistant sealing structure with high thermal efficiency; The
surface of the magnetic roller of CXG magnetic separator is coated with a
stainless steel wear-resistant layer; DCG magnetic separator excitation coil
water electric separation cooling, temperature rise controllable; The sealing of
the high-temperature chlorination furnace adopts a combination of fish scales
and graphite packing to prevent chlorine gas leakage; The QF classifier spindle
bearing adopts air seal to prevent dust from entering. These designs ensure the
long-term stable operation of the production line.
If you need equipment parameters or incoming material test data for
high-purity quartz sand dry purification line, please call Manager Zhang at
13583776655 (same as WeChat).