Carbon powder as a reducing agent, reduction molybdenum calcine in an electric furnace to produce ferromolybdenum method is called carbon reduction method or a stacked-block Diantan method. The main reaction in the furnace is:
 2 | MoO 3 +C = | 2 | Mo+2CO ↑       △ Z 0 = 208707-309.2T ( J ) |
3 | 3 |
The smelting from the reaction free energy ΔZ 0 must be carried out after T>675°C (ΔZ 0 <0). This reaction is easily carried out after heating to 675 ° C in an electric furnace. But at the same time, there will be side reactions:
 2 | MoO 3 + | 7 | Mo 2 C +2CO ↑ |
3 | 3 |
â–³Z 0 =214560-315.6T(J)
The formation of Mo 2 C causes the ferromolybdenum to have a high carbon content and a high melting point (Mo 2 C melting point is 2405 ° C). Aileu molybdenum and gold that carbon reduction experienced two steps: First, the heating molybdenum trioxide microparticles vaporous quickly spread to the toner adsorbed on the surface of the carbon particles, the reduction of CO, the reaction of the intermediate oxide Mo 4 O 11 generates CO 2 evolution; in the second step, the intermediate oxide Mo 4 O 11 diffuses into the carbon particles and continues to be reduced to Mo. The reaction formula is:
4MoO 3 +CO=Mo 4 O 11 +CO 2 ↑
â–³x 0 298=-294.7kj/mol
 1 | Mo 4 O 11 +C = | 4 | Mo+CO ↑ |
11 | 11 |
The carbon reduction block method must be smelted in an electric furnace. The capacity of the electric furnace used is usually not large: the capacity of the single-phase electric furnace is 300~500KV A, and the capacity of the three-phase electric furnace is 500~1500KVA. The unit consumption of electricity is about 4,450 kW·h/t. The charge is composed of molybdenum calcine and carbon powder compacts, lime and iron filings. The smelting is carried out by high carbon briquetting smelting (reduction process, the amount of carbon used is higher than the theoretical value of the reaction) and the carbon-deficient briquetting smelting (refining process, the added carbon amount is lower than the theoretical value of the reaction), and the ferromolybdenum to be refined is After the bottom of the furnace is piled up, the furnace is powered off, and the ferromolybdenum is cooled and then refined and packaged. The recovered waste must be smelted in a recovery furnace.
Ethylene Cracking Furnace Anchor
Anchors are mostly used as fixtures for integral linings (castable, plastic and sprayable linings). Refractory brick linings also use anchors, but they are not used in many occasions. Metal anchors are usually used to support and fix thin or heat-insulating integral linings, such as chimney linings, wear-resistant linings of petrochemical catalytic cracking reactors (usually tortoise shell mesh anchors), integral jet metallurgy The lining of the spray gun, the overall lining of the immersion pipe of the DH and RH vacuum degassing devices, the lining of the rotary kiln discharge day, the feeding port, etc. Metal anchors are mostly used to fix linings with a long-term use temperature below 1200 °C, or short-term use temperature above 1200 °C that can be used intermittently. Ceramic anchors are usually used to fix thicker (greater than 200mm) integral linings and are characterized by:
(1) It can withstand higher operating temperatures, and is generally used in the lining of kilns that are used for a long time above 1200 °C;
(2) It can withstand the erosion and corrosion of corrosive atmosphere;
(3) It can be extended to the working surface to reduce the peeling of the overall lining;
(4) Compared with metal anchors, the contact area with the refractory lining is large, so it has a greater supporting capacity;
(5) The thermal expansion coefficient is equivalent to that of the overall refractory material, which can eliminate the cracking or peeling of the lining due to thermal expansion mismatch
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