After more than a month of investigations, the police uncovered a criminal gang who was posing as a point-of-sale and specialized theft of small and medium-sized enterprise safes. More than 20 criminal cases have been solved.
Since the beginning of this year, a number of consecutive enterprises and public institutions have been burglarized in Beijing. The police have found video of the incident and surrounding surveillance. They found that the theft was carried out by four individuals. Every time they commit crimes, they wear hats, masks, and gloves. They deliberately disguised their physical appearance and frequently fled and fled the scene when fleeing the scene. They have a strong sense of anti-reconnaissance.
The police conducted a technical analysis of the surveillance videos, and conducted a review of the characteristics of the criminal gangs, the characteristics of the safes, tools for committing crimes, and escaping vehicles. It was found that the two criminal predecessors had significant suspicions. Beijing police tracked the gang members to go to Henan and other places and obtained important clues for the return of gang members to Beijing in early June.
On June 12, four members of the criminal gang gathered in a restaurant and the police decisively arrested the suspect.
After investigation, the key members of the gang, Zhou and Chen, were sentenced to 10 years in prison for stealing safes. They were released from prison just a year ago and they then plucked two other villagers to engage in theft activities. They specifically selected civil defense, physical defense, technical defense and other preventive measures are relatively weak, relatively flat office locations to commit crimes, during the day as a waste recycling personnel mixed into the company to understand the situation of the company's financial room, at night they turned over to the hospital, some people look, some people use Special tools to steal safes.
According to criminal suspects, this year they have only committed more than 20 crimes in Daxing District, Beijing, involving more than 500,000 yuan. At present, four suspects have been detained by the police for criminal theft.
The news comes from China Vault /
Natural Graphite , as its name implies, is naturally formed by natural Graphite , which is generally found in graphite schist, graphite-gneiss, graphite-bearing schist and metamorphic shale.
Features
The chemical composition of graphite is carbon (C). Naturally produced graphite is rarely pure and often contains impurities, including SiO2, Al2O3, MgO, CaO, P2O5, CuO, V2O5, H2O, S, FeO and H, N, CO2, CH4, NH3, etc. Natural graphite minerals are black, steel gray, striated black; Metallic luster, crypto, dull, opaque; The hardness is isotropic, the vertical cleavage surface is 3 ~ 5, the parallel cleavage surface is 1 ~ 2; Qualitative soft, density is 2.09 ~ 2.23 g/cm3, have the feeling of greasy, easy to contaminate finger. Mineral chip under the transmitted light is generally not transparent, extremely thin can pervious to light, the light green gray, refractive index of 1.93 ~ 2.07, under the reflected light is light gray, reflective pleochroism, Ro gray with brown, Re dark blue gray, reflectivity Ro23 (red), Re5.5 (red), the reflected color, double reflection were significantly, strong heterogeneity, polarization color for straw yellow.
Graphite is a complex six-party double cone, assumes the six-party tabular crystal, common simplex are parallel double, six-party double cone, hexagonal prism, but in good condition with rare crystal forms, the generally show scaly or platy, aggregate density lump, earthy or globular.
Type
The process performance and usage of graphite is mainly depends on the degree of crystallization, in accordance with its natural Graphite Crystal morphology can be divided into crystalline graphite, Flake Graphite ) and aphanitic graphite (earthy graphite) two types of industry.
Crystalline graphite
In the crystalline (scale) graphite ore, the diameter of graphite crystals is greater than 1 mu m. Ore grade is low, but optional; The mineral associated with graphite is usually mica, feldspar, quartz, diopathic stone, diabase, garnet and a small amount of pyrite, calcite, etc., some of which have some useful components, such as rutile and vanadium. The ore is scales, grainy scales or granulocyte structures, flaky, flaky, or blocky structures.
Crystalline (scale) graphite is divided into High Purity Graphite, High Carbon Graphite, Medium Carbon Graphite and low Carbon Graphite according to the fixed carbon content.
The high purity graphite (fixed carbon content is greater than or equal to 99.9%) is mainly used for flexible graphite sealing material, nuclear graphite, instead of platinum crucible for chemical reagent melting and lubricant base material, etc.
High carbon graphite (fixed carbon content 94.0% ~ 99.9%) is mainly used for refractory materials, lubricant substrate, brush raw materials, carbon products, battery raw materials, pencil materials, filling materials and coatings, etc.
Carbon graphite (80% ~ 94% fixed carbon content) is mainly used for crucible, refractories, casting materials, foundry coatings, pencil raw materials, battery materials and dyes, etc.
Low carbon graphite (fixed carbon content 50.0% ~ 80.0%) is mainly used for foundry coatings.
Cryptocrystalline graphite
Cryptocrystalline graphite is also called soil graphite or amorphous graphite. In cryptocrystalline graphite ore, graphite crystals are less than 1 mu m in diameter, which are microcrystalline and can only be seen in the electron microscope. High grade of ore, but poor selectable; The mineral associated with graphite is often quartz and calcite; The ore is microscaly - cryptocrystalline structure, block or soil structure.
Cryptocrystalline graphite ore is mainly distributed in contact metamorphic deposits. Actually the diameter graphite flake graphite ore is uneven, the so-called crystalline graphite ore, may also contain the aphanitic graphite, are too many content is often referred to as the mixed type graphite ore, may also contain a small amount of aphanitic graphite quality mineral crystalline flake graphite piece diameter slightly larger than 1 microns.
Cryptocrystalline graphite ore is mainly used in pencil, battery, electrode, graphite emulsion, graphite bearing ingredients and the raw materials of battery carbon rod. The non-ferrous graphite is mainly used for casting materials, refractory materials, dyes and electrode paste.
Natural Graphite
Natural Graphite,Expanded Graphite,Colloidal Graphite,Special Graphite
Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com