1. Overview
China's molybdenum reserves are among the highest in the world. There are molybdenum mines in Jinxi, Jinduicheng, Jilin, Shanxi, Henan, Fujian, Guangdong, Hunan, Sichuan, Jiangxi and other provinces, with large reserves and good development conditions, and the output occupies an important position in the country. Molybdenum ore with industrial value is mainly molybdenite (MoS2), and about 99% of molybdenum ore is mined in the form of molybdenite (MoS2). At present, China molybdenum concentrate is mainly exported to Russian, Japanese and western countries.
2. Nature
MoS2 is lead gray, similar to graphite, with metallic luster and belongs to hexagonal system. Crystals are often hexagonal, with patterns at the bottom, soft and smooth, thin and elastic. Specific gravity 4.7 ~ 4.8, hardness 1 ~ 1.5, melting point 795℃. The molybdenum disulfide stripes on the ceramic plate are light green gray or light green black. When heated to 400 ~ 500℃, molybdenum disulfide is easily oxidized to molybdenum trisulfide, and molybdenite (molybdenum disulfide) can be decomposed by nitric acid and aqua regia.
use
Molybdenum disulfide is used to produce ferromolybdenum alloy, metallic molybdenum, calcium molybdate, ammonium molybdate, lubricant and so on.
4. Run the system
Molybdenite (MoS2) is a kind of floatable mineral, and flotation is the main method to purify MoS2. Molybdenum concentrate containing 85 ~ 95% molybdenum can be obtained by flotation, and the total recovery rate is 90%.
bale
There are two kinds of packaging for exporting molybdenum concentrate: ① inner glass fiber bag and outer gunny bag, each with a net weight of 50 kg; ; ② The net weight of inner latex bag and outer gunny bag is 25 ~ 30kg or 50kg.
6. Quality specifications and chemical composition
According to the technical conditions of GB 3200-89 molybdenum concentrate, it is divided into three grades and nine varieties (see table 6-6-39).
Table 6-6-39 Quality Specifications of Molybdenum Concentrate
Molybdenum grade% is not less than impurity% and not more than.
Silicon dioxide is tin, phosphorus, copper, lead and calcium.
Advanced level 517.0 0.05 0.04 0.03 0.20.30 2.8
Category II 518.5 0.03 0.02 0.20.1.51.4
Three kinds of 515.00.100.100.050.6010.5.
First-class products and first-class products 47 9.0 0.07 0.07 0.05 0.3 0.40 3.0
Class II 4711.05 0.05 0.03 0.30.20 2.0
Three kinds of 47 6.00.200.150.101010/0.5.
Secondary 4512.0 0.07 0.07 0.30.50 3.0
Class II 4513.00.06 0.06 0.04 0.30 2.0
Three kinds of 456.00.250.150.151.51.502.0.
Note: ① The first and second categories are molybdenum concentrate products produced by flotation, and the third category is molybdenum concentrate products comprehensively recovered from polymetallic ores such as tungsten, tin and molybdenum; (2) Rhenium in molybdenum concentrate is a valuable element, and the supplier shall provide analysis data.
7. Inspection standard
The chemical composition of molybdenum concentrate for export should be tested according to GB/T 15079-94.
8. Take notes
① According to user's requirements, the production unit can supply molybdenum concentrate products with Mo≥54%; ② Individual indicators in the above table can be adjusted through negotiation between the supplier and the demander; (3) The particle size of molybdenum concentrate products after passing through a 200-mesh sieve should not be less than 60%; The particle size of comprehensively recovered molybdenum concentrate products should be agreed by both parties; ④ The sum of moisture and oil content in molybdenum concentrate products shall not be greater than 4%; ⑤ Concentrate products shall not be mixed with foreign impurities.