Efficient feeding process for copper smelting top-blowing smelting furnace

Abstract

The invention provides an efficient copper smelting top-blowing smelting furnace feeding process. The efficient copper smelting top-blowing smelting furnace feeding process comprises the following steps that S1, moisture of copper concentrate entering a concentrate warehouse is detected; s2, the copper concentrates with different water contents are subjected to dry and wet matching and batching, the water content of the prepared mixed copper concentrates is controlled to be 12% or below, and the evenly-mixed copper concentrates are directly conveyed to a feeding opening of an Australian furnace through a metering belt; s3, spraying the materials at a belt of a furnace top charger entering a charging hole of the Australian furnace so as to reduce flue gas mechanical inclusion after the materials enter the furnace; the feeding process is greatly simplified, the efficiency is improved, and the safety risk is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of copper smelting, in particular to an efficient charging process for a top-blown smelting furnace for copper smelting. Background Art

[0002] In modern copper pyrometallurgy, top-blown melt pool smelting technology is a relatively advanced pyrometallurgy technology. The most representative furnace types are the Ausmelt furnace and the Isa furnace, which are responsible for the smelting of copper concentrate, producing high-grade matte, slag and high-concentration sulfur dioxide flue gas, and are the key process in copper smelting.

[0003] The material preparation system of the traditional copper smelting top-blown smelting furnace is relatively complex: after the copper concentrate is transported to the concentrate warehouse through logistics, it is fed to the weighing platform by the crane grab bucket. After the weighing platform is discharged, it is transported to the drying kiln for drying through the metering belt and the transport belt. After the moisture content of the copper concentrate is reduced to below 12%, it is transported to the silo through the transport belt. The silo is quantitatively fed to the disc granulation process through the disc feeder and the metering belt. After the copper concentrate is granulated by the disc granulator, it is transported to the Australian furnace charging port through the belt, and finally enters the Australian furnace to participate in the matte-making reaction. This process is very complicated, and the core is the drying kiln system, the belt conveyor system and the disc granulation system. The existence of the drying kiln and the disc granulation process also makes the belt conveyor system very cumbersome and the process flow is long. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an efficient charging process for a copper smelting top-blown smelting furnace.

[0005] The specific scheme of the present invention is as follows: an efficient copper smelting top-blown smelting furnace charging process, comprising the following steps: S1, detecting the moisture content of the copper concentrate entering the concentrate storehouse; S2. Copper concentrates with different moisture content are mixed in dry and wet conditions. The moisture content of the mixed copper concentrate is controlled below 12%. The evenly mixed copper concentrate is directly transported to the charging port of the Australian furnace through a metering belt. S3. Spray the material at the top feeder belt entering the Australian furnace to reduce the mechanical inclusion of the flue gas after the material enters the furnace.

[0006] Furthermore, the step S3 also includes reducing the transmission speed of the feeding belt conveyor to increase the thickness of the material, thereby avoiding dispersion of the material entering the Australian furnace.

[0007] Furthermore, a frequency converter is provided on the driving mechanism of the feeding belt conveyor to appropriately adjust the conveying speed according to the particle size of the material.

[0008] Furthermore, during the charging process, the negative pressure at the outlet of the Australian furnace is controlled within the range of -30Pa~-15Pa.

[0009] Furthermore, in step S2, the batching process adopts multiple batching to ensure that the ingredients are mixed evenly to achieve the effect of drying kiln mixing.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The drying process and the disc granulation process are eliminated. By optimizing the copper concentrate batching, the dry and wet combination and multiple batching, the moisture content of the copper concentrate is ensured to be uniform, thereby achieving the purpose of eliminating the drying kiln; 2. The disc granulation process is eliminated. By adding a spray mechanism to the feeder belt and changing the belt transmission speed, the thickness of the material entering the Australian furnace is increased, thereby reducing the smoke rate. DETAILED DESCRIPTION

[0011] The present embodiment provides an efficient copper smelting top-blown smelting furnace charging process, comprising the following steps: S1, copper concentrate raw material moisture detection: the copper concentrate entering the concentrate storehouse is tested for moisture to understand the moisture content of different copper concentrates.

[0012] The copper concentrate with different moisture content is mixed and mixed by multiple batching. The moisture content of the mixed copper concentrate is controlled below 12% during the batching process to achieve the effect of drying in the drying kiln. At the same time, the batching process of different copper concentrates is carried out twice, that is, the mixed materials are turned over again by the driving crane to ensure that the ingredients are evenly mixed and achieve the effect of mixing in the drying kiln.

[0013] S2. Optimize the feeding of materials into the furnace. Add a spray mechanism to the top feeding machine belt entering the Australian furnace feeding port to increase the moisture content of the mixed materials and reduce the mechanical inclusion of the flue gas after the materials enter the furnace.

[0014] S3. Strictly control the negative pressure. Strictly control the negative pressure at the outlet of the Australian furnace to -30pa~-15pa, reduce the fan converter of the high-temperature flue gas of the Australian furnace, and thus reduce the mechanical inclusion of the flue gas.

[0015] S4. Adjust the belt frequency of the furnace top feeder: Carry out electrical transformation on the furnace top feeder and add a frequency converter. The furnace top feeder can flexibly adjust the frequency; reduce the belt frequency of the furnace top feeder from 50HZ to 30HZ; reduce the belt transport speed, increase the thickness of the material, and the material will not disperse when entering the Australian furnace, thereby reducing the smoke rate.

[0016] The present invention eliminates the drying and granulation process, and builds a new long belt directly from the concentrate warehouse to the Australian furnace. After the copper concentrate is batched and enters the weighing platform silo, it is quantitatively fed through the metering belt, mixed in the long belt, and transported to the Australian furnace feeding port through the long belt. The present invention greatly simplifies the material preparation process of copper concentrate, greatly reduces the number of belt conveyors, and also greatly reduces the belt transportation distance, thereby reducing safety risks.

Claims

1. An efficient copper smelting top-blown smelting furnace charging process, characterized by: The following steps are involved: S1. Detect moisture content of copper concentrate entering the concentrate warehouse; S2. Copper concentrates with different moisture content are mixed in dry and wet conditions. The moisture content of the mixed copper concentrate is controlled below 12%. The evenly mixed copper concentrate is directly transported to the charging port of the Australian furnace through a metering belt. S3. Spray the material at the top feeder belt entering the Australian furnace to reduce the mechanical inclusion of the flue gas after the material enters the furnace.

2. The efficient copper smelting top-blown smelting furnace charging process according to claim 1 is characterized in that: The step S3 also includes reducing the transmission speed of the feeding belt conveyor to increase the thickness of the material, thereby avoiding dispersion of the material entering the Australian furnace.

3. The efficient copper smelting top-blown smelting furnace charging process according to claim 1 is characterized by: The driving mechanism of the feeding belt conveyor is equipped with a frequency converter to appropriately adjust the conveying speed according to the particle size of the material.

4. The efficient copper smelting top-blown smelting furnace charging process according to claim 1 is characterized by: During the charging process, the negative pressure at the outlet of the Australian furnace is controlled within the range of -30Pa~-15Pa.

5. The efficient copper smelting top-blown smelting furnace charging process according to claim 1 is characterized by: In step S2, the batching process adopts multiple batching to ensure that the ingredients are mixed evenly to achieve the effect of drying kiln mixing.