Light burning and electric melting joint production equipment for small-particle and powder magnesite

Abstract

The utility model provides light burning and electric melting joint production equipment for small-particle and powder magnesite, which comprises a preheating furnace, a fluidized bed furnace, a multi-stage settling chamber, a hot powder surge bin, a cyclone dust collector and a bag type dust collector, the preheating furnace conveys preheated raw materials to the fluidized bed furnace, the fluidized bed furnace carries out light burning on the raw materials, and the multi-stage settling chamber is arranged in the multi-stage settling chamber. The generated hot light burning powder enters the multi-stage settling chamber along with the hot flue gas, the hot flue gas enters the preheating furnace from the multi-stage settling chamber, the hot light burning powder enters the hot powder surge bin from the bottom of the multi-stage settling chamber, and a flue gas outlet in the top of the preheating furnace is sequentially connected with a cyclone dust collector and a bag type dust collector. The light burning and electric melting joint production equipment for the small-particle and powder magnesite is small in occupied area, low in cost, low in energy consumption, easy to implement and operate and suitable for application and popularization.

Description

Technical Field

[0001] The utility model relates to a method for processing small-particle and powder magnesite, in particular to light-burning and electric-melting combined production equipment for small-particle and powder magnesite. Background Art

[0002] The kilns for producing light-burned magnesium oxide mainly include vertical kilns, rotary kilns, suspension kilns, multi-layer furnaces, boiling furnaces, etc. (among which the most widely used kilns in my country are reflective vertical kilns). The corresponding light-burning process is to put block magnesite into the kiln. The temperature during the light-burning process is as high as 1200℃ or more, and the reaction time takes 3-5 hours. After the light-burning is completed, the light-burned magnesium oxide is cooled by the cooling system, and finally formed into powdery finished products for storage after crushing and grinding. However, this light-burning process can only calcine block magnesite of 30mm-80mm, which will result in many small particles and powdered magnesite being unused and unable to be effectively calcined. In addition, the waste heat generated by the light-burned magnesium oxide during the cooling process is also consumed in vain, resulting in a waste of resources and energy.

[0003] The light-burned magnesia is the raw material for preparing large-crystal fused magnesia. The large-crystal fused magnesia is prepared using an electric molten arc furnace. The production process of the electric molten arc furnace is to put the light-burned magnesia product into the furnace tube for smelting, which generally needs to be heated to above 2800°C. After the smelting is completed, the furnace tube is naturally cooled in the workshop to finally obtain a large-crystal fused magnesia product.

[0004] It can be seen that light-burned magnesium oxide is cooled to form a finished product, and it needs to be heated when preparing large-crystal fused magnesia. It requires a large amount of energy to heat the cold light-burned magnesium oxide, and then cool it after electric melting production. There is serious energy waste and consumption in the independent production and operation of the light-burned kiln and the electric-melting ore-heating furnace. If the two can be effectively connected and jointly produced, preheating can be fully utilized to reduce energy consumption. In this way, the electric-melting ore-heating furnace and the kiln for producing light-burned magnesium oxide are connected, and the light-burned magnesium oxide can be directly transported to the electric-melting ore-heating furnace to prepare large-crystal fused magnesia without cooling treatment. Utility Model Content

[0005] The utility model provides a light burning and electric melting combined production equipment for small particle and powder magnesite, which solves the problem that small particle and powder magnesite cannot be utilized, and at the same time solves the problem that light burning and electric melting of light burned magnesium oxide are two independent production processes. The technical scheme is as follows:

[0006] A light-burning electric-melting combined production equipment for small-particle and powder magnesite, comprising a preheating furnace, a boiling furnace, a multi-stage sedimentation chamber, a hot powder buffer bin, a cyclone dust collector and a bag dust collector. The preheating furnace conveys preheated raw materials to the boiling furnace, the boiling furnace performs light burning on the raw materials, and the generated hot light-burned powder enters the multi-stage sedimentation chamber with the hot flue gas, the hot flue gas enters the preheating furnace from the multi-stage sedimentation chamber, and the hot light-burned powder enters the hot powder buffer bin at the bottom of the multi-stage sedimentation chamber, and the flue gas outlet at the top of the preheating furnace is connected to the cyclone dust collector and the bag dust collector in sequence.

[0007] The preheating furnace is used to preheat the raw materials, the upper material inlet is used to input the raw materials, the top smoke outlet is connected to the dust removal inlet of the cyclone dust collector, and the bottom material outlet is used to discharge the preheated raw materials.

[0008] The materials in the preheating furnace are transported by a hoist.

[0009] The material outlets of the preheating furnace, the cyclone dust collector and the bag dust collector are all connected to the buffer bin, the material outlet of the buffer bin is connected to the material feeder, and the other end of the material feeder is connected to the material inlet of the boiling furnace.

[0010] The upper part of the fluidized bed furnace is provided with a material inlet, the top is provided with a smoke outlet, the smoke outlet is connected to the material inlet of the multi-stage settling chamber, and the bottom of the fluidized bed furnace is provided with a slag discharge port for discharging unreacted large-particle magnesite. The fluidized bed furnace can be replaced by a suspension furnace.

[0011] The multi-stage settling chamber is provided with at least one stage, the material inlet of the lower settling chamber is connected to the smoke outlet of the upper settling chamber, the lower settling chamber is located above the upper settling chamber, the material inlet of the first settling chamber is connected to the boiling furnace, the smoke outlet of the last settling chamber is connected to the preheating furnace, and the material outlet at the bottom of each settling chamber is connected to the hot powder buffer bin.

[0012] The material outlet of the hot powder buffer bin is connected to a light-burned magnesium oxide feeder, and the other end of the light-burned magnesium oxide feeder is connected to an electric melting furnace.

[0013] The dust removal inlet of the cyclone dust collector is connected to the preheating furnace, the smoke outlet at the top is connected to the dust removal inlet of the bag dust collector, and the material outlet at the bottom is used to discharge the material.

[0014] The pipeline connecting the boiling furnace to the multi-stage settling chamber and the pipeline connecting the multi-stage settling chamber to the preheating furnace are both provided with a heat-insulating layer on the outside.

[0015] The light-burning electric melting combined production equipment for small particles and powdered magnesite makes full use of the waste heat generated by light burning, the hot flue gas is used for circulating preheating raw materials, and the hot light-burning powder is directly put into the electric melting furnace, which reduces heating energy consumption and saves energy. The kiln and equipment involved in the utility model have a small footprint, low cost, low energy consumption, are easy to implement and operate, and are suitable for application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process of the light burning and electric melting combined production equipment of small particles and powder magnesite; DETAILED DESCRIPTION

[0017] like Figure 1 As shown, the light-burning electric-melting combined production equipment for small particles and powdered magnesite comprises a preheating furnace 1, a boiling furnace 4, a multi-stage settling chamber 5, a hot powder buffer bin 8, a cyclone dust collector 6 and a bag dust collector 7. The preheating furnace 1 conveys the preheated raw materials to the boiling furnace 4, the boiling furnace 4 lightly burns the raw materials, and the generated hot light-burned powder enters the multi-stage settling chamber 5 with the hot flue gas, the hot flue gas enters the preheating furnace from the multi-stage settling chamber 5, and the hot light-burned powder enters the hot powder buffer bin at the bottom of the multi-stage settling chamber 5, and the flue gas outlet at the top of the preheating furnace 1 is connected to the cyclone dust collector 6 and the bag dust collector 7 in sequence.

[0018] In this figure, the downward arrow represents the transfer process of the solid raw material, and the upward arrow represents the movement direction of the hot flue gas. The material inlet of the preheating furnace 1 is connected to the elevator 11, and the raw material to be preheated is fed into the elevator 11. The raw material is small particles and powder of magnesite, and the particle size is not more than 50mm.

[0019] The preheating furnace 1 is used to preheat the raw materials, the material inlet at the top is used to input the raw materials, the smoke outlet at the top is connected to the dust removal inlet of the cyclone dust collector 6, and the material outlet at the top is used to discharge the preheated raw materials.

[0020] The dust removal inlet of the cyclone dust collector 6 is connected to the preheating furnace, the smoke outlet at the top is connected to the dust removal inlet of the bag dust collector 7, and the material outlet at the bottom is used to discharge the material.

[0021] The dust removal inlet of the bag filter 7 is connected to the cyclone dust collector, the smoke outlet at the top is connected to the outside air, and the material outlet at the bottom is used to discharge the material.

[0022] Furthermore, the material outlets of the preheating furnace 1 , the cyclone dust collector 6 , and the bag dust collector 7 are all connected to the buffer bin 2 , and the material enters the buffer bin 2 .

[0023] The material outlet of the buffer bin 2 is connected to a material feeder 3 , and the other end of the material feeder 3 is connected to the material inlet of the boiling furnace 4 , and the material is transported to the boiling furnace 4 through the material feeder 3 .

[0024] The upper part of the fluidized bed furnace 4 is provided with a material inlet, the top is provided with a smoke outlet, the smoke outlet is connected to the material inlet of the multi-stage settling chamber, and the bottom of the fluidized bed furnace 4 is provided with a slag outlet for outputting unreacted large particles of magnesite. A fluidized bed is provided in the fluidized bed furnace for light burning of small particles and powdered magnesite. The fluidized bed furnace is heated by gas or other fuels to a temperature of about 1000-1200°C.

[0025] Furthermore, the boiling furnace can be replaced by a suspension furnace, which is a kiln in which fine particles or powdered materials are suspended in a hot gas flow under the action of a heat-carrying gas, and intense heat and mass transfer processes occur between gas and solid.

[0026] The multi-stage sedimentation chamber 5 is provided with at least one stage. When there are more than two stages, the heights of the sedimentation chambers of different stages are different. The lowest one is the first-stage sedimentation chamber. The material inlet of the first-stage sedimentation chamber is connected to the boiling furnace, and the smoke outlet arranged on the top is connected to the material inlet of the next-stage sedimentation chamber, and so on. The material outlet at the bottom of the first-stage sedimentation chamber is connected to the hot powder buffer bin, and the smoke outlet at the top of the last-stage sedimentation chamber is connected to the smoke inlet below the preheating furnace. The material outlets at the bottom of each sedimentation chamber are connected to the hot powder buffer bin.

[0027] Even if some hot light-burned powder enters the preheating furnace with the hot flue gas, it will enter the boiling furnace regardless of whether it enters the boiling furnace or is collected by the cyclone dust collector and bag dust collector.

[0028] The material outlet of the hot powder buffer bin 8 is connected to the light-burned magnesium oxide feeder 9, and the other end of the light-burned magnesium oxide feeder 9 is connected to the electric melting furnace. The material is transported to the electric melting furnace through the light-burned magnesium oxide feeder 9 to prepare large-crystal fused magnesia sand.

[0029] The utility model is suitable for the rapid calcination of small particles and powdered magnesite, which solves the long-term situation that these magnesite raw materials cannot be used and resources are wasted in large quantities, and makes full use of the waste heat generated by light burning. The hot flue gas is used for circulating preheating raw materials, and the hot light burning powder is directly put into the electric melting furnace, which reduces heating energy consumption and saves energy. The utility model occupies a small area, has low cost, low energy consumption, is easy to implement and operate, and is suitable for application and promotion.

Claims

1. A light burning and electric melting combined production equipment for small particles and powdered magnesite, characterized by: It includes a preheating furnace, a boiling furnace, a multi-stage settling chamber, a hot powder buffer bin, a cyclone dust collector and a bag dust collector. The preheating furnace transports the preheated raw materials to the boiling furnace. The boiling furnace lightly burns the raw materials. The generated hot light-burned powder enters the multi-stage settling chamber with the hot flue gas. The hot flue gas enters the preheating furnace from the multi-stage settling chamber. The hot light-burned powder enters the hot powder buffer bin at the bottom of the multi-stage settling chamber. The flue gas outlet at the top of the preheating furnace is connected to the cyclone dust collector and the bag dust collector in sequence.

2. The light-burning and electric-melting combined production equipment of small-particle and powder magnesite according to claim 1 is characterized in that: The preheating furnace is used to preheat the raw materials, the upper material inlet is used to input the raw materials, the top smoke outlet is connected to the dust removal inlet of the cyclone dust collector, and the bottom material outlet is used to discharge the preheated raw materials.

3. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The materials in the preheating furnace are transported by a hoist.

4. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The material outlets of the preheating furnace, the cyclone dust collector and the bag dust collector are all connected to the buffer bin, the material outlet of the buffer bin is connected to the material feeder, and the other end of the material feeder is connected to the material inlet of the boiling furnace.

5. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The upper part of the fluidized bed furnace is provided with a material inlet, the top is provided with a smoke outlet, the smoke outlet is connected to the material inlet of the multi-stage settling chamber, and the bottom of the fluidized bed furnace is provided with a slag discharge port for outputting unreacted large-particle magnesite.

6. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The multi-stage settling chamber is provided with at least one stage, the material inlet of the lower settling chamber is connected to the smoke outlet of the upper settling chamber, the lower settling chamber is located above the upper settling chamber, the material inlet of the first settling chamber is connected to the boiling furnace, the smoke outlet of the last settling chamber is connected to the preheating furnace, and the material outlet at the bottom of each settling chamber is connected to the hot powder buffer bin.

7. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The material outlet of the hot powder buffer bin is connected to a light-burned magnesium oxide feeder, and the other end of the light-burned magnesium oxide feeder is connected to an electric melting furnace.

8. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The boiling furnace can be replaced by a suspension furnace.

9. The light burning and electric melting combined production equipment of small particles and powdered magnesite according to claim 1 is characterized by: The dust removal inlet of the cyclone dust collector is connected to the preheating furnace, the smoke outlet at the top is connected to the dust removal inlet of the bag dust collector, and the material outlet at the bottom is used to discharge the material.

10. The light burning and electric melting combined production equipment of small particles and powder magnesite according to claim 1 is characterized by: The pipeline connecting the boiling furnace to the multi-stage settling chamber and the pipeline connecting the multi-stage settling chamber to the preheating furnace are both provided with a heat-insulating layer on the outside.

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