Continuous high-temperature carbonization furnace and method for continuously producing coarse-grained carbide powder

Abstract

The invention discloses a continuous carbonization furnace and a method for continuously producing coarse-grained carbide powder. The furnace is a tunnel type and boat propulsion type furnace, and consists of a furnace end, a low-temperature deoxidizing area, a high-temperature carbonizing area and a furnace tail in sequence, wherein a furnace tube of the low-temperature deoxidizing area is made of heat-resistant steel or ceramic, and is heated by using an electric heating element; a heat-preserving material is an organic non-metallic refractory material; the temperature is controlled separately, and is lower than the working temperature of the high-temperature carbonizing area; a reducing gas H2 serving as a working medium is introduced; a non-oxidizing gas serving as a protective gas is input into the furnace tube of the high-temperature carbonizing area; and the protective gas flows through the furnace tail, the high-temperature carbonizing area, the low-temperature deoxidizing area and the furnace end in sequence. A production method comprises the following steps of: burdening and mixing; loading into a boat, and conveying the boat; deoxidizing at a low temperature; carbonizing at a high temperature; and discharging to obtain the coarse-grained carbide powder. The carbon content of the produced carbide powder can be consistent with a certain requirement, and shortening of the service lives of furnace tubes, heating bodies, heat-preserving bodies and the like in the furnace caused by the losses of carbon / graphite materials can be prevented.

Description

technical field [0001] The invention belongs to the technical field of refractory metals and superhard materials, and relates to continuous carbonization equipment for coarse carbide powder and a corresponding production method. Background technique [0002] The production method of carbide powder is generally to mix metal powder and carbon black in a certain proportion, then put the mixture of metal powder and carbon black in a graphite boat, put it into carbonization equipment, and carry out carbonization treatment at a certain temperature . According to different carbonization equipment, the production method of carbide powder can be divided into batch type and continuous type. The equipment used in batch production is generally a vertical intermediate frequency carbonization furnace. Graphite boats containing a mixture of metal powder and carbon black are loaded into the furnace in batches. The amount of charge in one batch is relatively large, and the furnace temperat...

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Problems solved by technology

[0007] Carbon / graphite reacts to produce CO and consumes it rapidly. Some of the consumed carbon / graphite comes from the carbon mixed in the powder, and some comes from carbon / graphite materials such as furnace tubes, heating elements, and heat preservation bodies in the furnace. As a result, on the one hand, it affects the carbon content of the carbide powder, and on the other hand, the service life of the carbon / graphite materials such as the furnace tube, heating element, and heat preservation body in the furnace is greatly shortened, sometimes even about 1 to 2 months It is necessary to repair the furnace, replace the lost carbon / graphite material, increase the equipment maintenance cost, and frequently repair the furnace also affect the production

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