[Chemical composition] often contains a mixture of SiO2, Fe 2 O 3 , Al 2 O 3 , CaO, and the like.
[Crystal structure] monoclinic system; 
a 0 = 0.888 nm, b 0 = 0.525 nm, c 0 = 0.571 nm, β = 90°; Z = 8. Note: Water manganese ore is β = 90 ° is monoclinic.
[Form] The crystal is often columnar. Elongated along the c-axis, the column mask is clear and vertical. The aggregates are bundled. The twin crystal has (011) as the bonding surface. The sedimentary genesis are mostly cryptocrystalline blocks, and there are also mites or stalactites.
[Physical properties] steel dark gray to black; semi-metallic luster. The cleavage parallel {010} is complete, parallel to {110} and {001} medium. Hardness 3.5 to 4. The relative density is 4.2 to 4.33. Crisp.
[genesis and production] formed in a relatively reducing environment, in the low-temperature hydrothermal veins often clustered with barite and calcite . The manganese ore formed by sedimentation is often in the form of a block or a scorpion, which is a transition product between a tetravalent manganese mineral (pyromanganite) and a divalent manganese mineral (magnesium ore). Manganese ore is unstable under oxidizing conditions and is easily oxidized into pyrolusite.
[Identification features] were initially identified by their crystal form, cylindrical stripes and brown streaks. A reliable distinction from its similar minerals requires identification using differential thermal curves and X-ray powder crystal data.
[Main use] Important ore minerals of manganese.
HDPE Double Wall Corrugated Pipe
HDPE double wall corrugated pipe
HDPE double wall corrugated pipe Appearance, standard and Application
Black. Implementation of GB / T1942.1-2004 "buried HDPE structural wall pipeline system section 1; polyethylene double wall corrugated pipe", the elastic ring meet the requirements of HG / T3091-2000. Products are widely used in urban drainage, sewage engineering, agricultural irrigation, drip irrigation, water-saving irrigation projects, drainage, sand control projects.
HDPE double wall corrugated pipe Specification
1. N4(ID 200 mm.300 mm.400 mm.500 mm.600 mm.800 mm)
2. N8 (ID 200 mm.300 mm.400 mm.500 mm.600 mm.800 mm)
HDPE double wall corrugated pipe Features
n Unique structure, high impact strength ;
n Smooth inner wall,small water flow resistant.large fluid flow;
n Easy to connect,good joint seal,No infiltration;
n Extremely light weight ,hence easy to handle and reduce cost;
n More than 50 years` service life in buried condition.
n High-density polyethylene is a hydrocarbon polymer, non-polar, high acid and alkali corrosion resistance.
n Eco-environment materials, non-toxic, non-corrosive, non-scaling, recyclable;
n Temperature range,-60℃ the pipeline no breakage, the maximum temperature of the transmission -medium is 60℃
n Comprehensive project cost basically same as the concrete pipe, low operating costs
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