(1) Processing method of mineral processing
The purpose of diatomite beneficiation is to remove impurities such as silt, debris and iron and aluminum to enrich diatoms. Gravity beneficiation methods are generally used, which are divided into dry and wet. Dry sorting is to remove the gangue by air separator, or to remove organic matter, volatile matter and moisture by rotary dryer, mainly for high grade ore; wet sorting is to use hydrocyclones Large density gangue impurities are mainly used for low grade ores.
The purification of diatomaceous earth is also often carried out by chemical beneficiation method, that is, adding sulfuric acid, hydrochloric acid and auxiliary chemicals to the slurry to remove impurities such as iron and aluminum.
The diatomite beneficiation processing process is usually: raw ore → one section of grinding and drying → two sections of grinding and drying → pre-classification → cyclone separation → powdery product (can be used as final product) → calcination into rotary kiln (or calcination with flux) → Grinding cooling → sorting and grading → filler grade or filter aid grade products.
Since many fields utilize the porosity of the diatomite silicon shell structure, it is necessary to carefully select the crushing and grinding equipment during grinding to maximize the protection of the intact structure and unique shape of the skeleton and avoid secondary fracture.
Broken grinding equipment: commonly used Raymond mill and jet mill, wet processing also uses a scrubber.
Calcination drying equipment: Rotary kiln and rotary dryer are often used.
(2) Dressing practice
1. Jilin Province Changbai County Diatomite Industry Co., Ltd.
Changbai Diatomite Industry Company has introduced a production line with an annual output of 15,000 tons of diatomaceous earth filter aid from Witke Company of the United States. It was completed and put into production in 1992. The process flow (below) is to dry the diatomaceous earth. It is directly mixed with the flux powder, and then enters the rotary kiln for calcination. After the firing, the semi-finished product is processed into a final product after being classified. The diatomite ore processed by the company contains SiO 2 89.0%, Al 2 O 3 2.57%, Fe 2 O 3 1.20%, CaO 0.24%, and other impurities 6.99%. The product is diatom filter aid 100～1 200. In addition to natural dry products, the chemical composition of all calcined diatomaceous earth: SiO 2 89.7% ~ 91.1%, Al 2 O 3 4.7% ~ 4.8%, Fe 2 O 3 1.3% ~ 1.4%, CaO 0.44%, burnout The amount is 0.2% to 0.5%.
Diversion Tube,Graphite Tube,Diversion Plate,Graphite Diversion Tube
CARBONS TECH&CREATION(HENAN) INDUSTRY CO.,LTD , https://www.kyedmgraphite.com