What is the application of a vertical matte mill in the copper smelting field?

As the key equipment in non-ferrous smelting engineering, the vertical mill is advanced, reliable and has excellent performance. Its role in pulverizing and drying plays a vital role in the smooth operation of the process, especially for the flash furnace type and the fuming furnace type.

First, the application of vertical copper matte mill in copper sulfur preparation section:

1. Process introduction: Copper matte is the product of copper smelting section and is added to the blowing section as incoming material. If a flash furnace or a rotary float furnace is used in the blowing section, the matte needs to be granulated, ground and dried before it can be put into the furnace. Because the nozzle of the furnace has higher requirements for the particle size and moisture content of the furnace material, the particle size requirement of the copper matte is more than 80%, and the water content is less than 0.3%. Taking a copper smelting project using oxygen bottom blow smelting and rotary float blowing process as an example, the project has an annual output of 250,000 tons of cathode copper. The rotary float blowing furnace receives copper matte to produce crude copper. The copper matte needs to be ground into copper powder by vertical grinding, and the design capacity is 80t/h. In this project, the production process of copper matte powder is as follows: the granalized copper matte particles are measured by a quantitative feeder, the rotary feeder is air-locked, and then sent to the vertical copper matte grinding machine powder and dry, the powder is collected by a cloth bag dust collector, and then sent to the top bin of the blowing furnace by a buried scraper conveyor, and the batching and metering are finally sprayed into the rotary floating blowing furnace for copper matte blowing. The hot air in the grinding process is supplied by the hot blast furnace. The vertical matte mill is equipped with automatic recharging system, and the recharging generated by the abrasive is returned to the mill entrance by the bucket elevator. The whole system is controlled by micro negative pressure of induced draft fan.

2, design points: Because the copper matte particles may be included in the intermediate treatment process such as grab iron filings, iron filings into the vertical copper matte mill will affect the life of the roller, so before feeding, add two iron removal devices to prevent iron filings from grinding. When the hot blast stove is baking, the hot gas generated by the oven should be mixed with a certain amount of cold air to ensure that the hot air temperature entering the bag dust collector is less than 150°C, so as not to burn through the bag. The particles of the water quenched matte are generally uniform, but in production practice, the volume of the matte particles at the end of the chute will be mixed, and the volume of the matte particles is obviously larger than that of the water quenched matte particles, and these larger volumes of matte will be stuck at the air lock feeder, which has a great impact on the continuity of the system. Therefore, in the design, it is necessary to increase the detection and interception of large copper matte that does not meet the volume requirements to ensure continuous production.

Two, vertical copper matte mill processing quartz powder, block smoke:

Quartz stone participates in the reaction as a flux to adjust the slag composition, and the dust needs to return to the reaction due to its high content of valuable metals. Therefore, if it is a double flash process, in addition to the copper matte grinding system, it is also necessary to have a quartz grinding system for slagging in the melting stage, and a block dust grinding system for the valuable metal in the block dust back to the furnace. In the case of bottom-blow melting-float (flash) blowing process, the dust can be returned through the melting system by adding a small amount of quartz along with the matte during the blowing stage, without additional vertical grinding.

The vertical copper matte mill integrates fine crushing, drying, grinding and powder selection, which simplifies the production process. It has the advantages of high grinding efficiency, low power consumption, large feeding particle size, easy adjustment of product fineness, simple equipment process, small footprint, low noise, small dust, simple operation and maintenance, low operating cost, and less consumption of wear-resistant materials.