Application of silicon carbide composite material to calcium carbide furnace spout

Abstract

The invention discloses the application of a silicon carbide composite material in a calcium carbide furnace spout, belonging to the technical field of calcium carbide furnaces. The calcium carbide furnace spout is formed by laying furnace port bricks made of the silicon carbide composite material. The silicon carbide composite material is composed of the following raw materials in parts by weight: 105 to 125 parts of industrial silicon carbide, 80 to 85 parts of silicon nitride, 60 to 75 parts of corundum, 40 to 55 parts of nanometer ceramic, 1 to 4 parts of sodium citrate, 2 to 7 parts of sodium carboxymethyl cellulose, 5 to 10 parts of refractory clay, 2 to 8 parts of silicon dioxide micro powder and 3 to 5 parts of pure calcium aluminate cement. Through the sodium citrate and the sodium carboxymethyl cellulose, the dispersity and the stability of an oxidation material in the brick material are improved; therefore, the calcium carbide furnace spout made of the brick material formedby sintering the novel silicon carbide composite material has the advantages of good high-temperature chemical stability, chemical erosion and slag corrosion resistance, small thermal expansion coefficient, deformation resistance, high strength, high hardness, scouring resistance, oxidation resistance, thermal shock resistance, good wear resistance, long service life and convenience in construction.

Description

technical field [0001] The invention belongs to the technical field of calcium carbide furnaces, and in particular relates to the application of a silicon carbide composite material on an orifice of a calcium carbide furnace. Background technique [0002] The calcium carbide furnace door is an important channel for the calcium carbide after the smelting reaction to flow to the calcium carbide pot, also known as the furnace outlet. This part is mainly composed of two parts: the furnace door and the furnace eye: the furnace door is an arched door made of silicon nitride combined with silicon carbide bricks; the furnace eye is composed of an inner eye and an outer eye; It is fired by the burn-through device. The shape is mainly a bell mouth with a small inside and a big outside. The inner eye is opened by manual operation using steel fibers, or a steel pipe without gaps is used to burn through oxygen. The design of the furnace door is The weakest part of the entire furnace bod...

AI Technical Summary

Problems solved by technology

[0004] 1. The furnace door is severely corroded by heat. The furnace door is the place closest to the electrode, and it is also the most severely corroded by heat. The furnace door is damaged the fastest at the exit of the furnace and the service life of the furnace lining is the weakest link.

[0005] 2. The furnace door has been eroded by oxidation, moisture, ferrosilicon, etc. for a long time. When the calcium carbide flows out, the furnace door must withstand the chemical erosion of CaO, FeO, MgO and other alkali metals in the calcium carbide liquid. When air enters, the furnace door will be oxidized by a certain amount of carbon dioxide. If the hole is blocked with water-containing gun mud, the oxidation corrosion will intensify the reaction.

[0007] 4. The three furnace outlets cannot be used in a balanced manner when the furnace is released, resulting in serious burn damage to the frequently used furnace door

[0008] Since the calcium carbide furnace produces products, in an air environment, high-temperature products flow out from the liquid outlet, resulting in damage to the furnace door material due to oxidation, erosion, erosion, and deformation. Therefore, it is necessary to provide a new type of silicon carbide Calcium carbide furnace orifice made of composite materials