CN-122012921-A - Wet ball pressing process for dolomite powder ore

Abstract

The invention discloses a dolomite powder ore wet ball pressing process. The process aims to solve the problem that dolomite powder ore with the granularity smaller than 20mm cannot be directly used for steelmaking and is backlogged for a long time. The method comprises the steps of taking dolomite powder ore as a raw material, adding auxiliary materials (a mixture of white clay, OG mud and ferric oxide dander) accounting for 3-8% of the mass of the dolomite powder ore, adding water, uniformly mixing, pressing into balls through a disc ball press, and naturally drying and curing until the water content is lower than 3%. The invention utilizes cheap and easily obtained auxiliary materials, prepares the waste dolomite powder ore into qualified pellets with high strength (more than or equal to 800N/ball) through a simple wet ball pressing process, realizes effective recovery of resources, reduces processing cost, eliminates potential safety hazard caused by powder ore accumulation, and provides an economic dolomite raw material source for steelmaking process.

Inventors

• Yi Zhonglie
• JIANG XINTAI
• ZHAO XIAOLONG
• LIANG JINPENG

Assignees

• 甘肃酒钢集团宏兴钢铁股份有限公司

Dates

Publication Date

20260512

Application Date

20260305

Claims (6)

1. 1. The dolomite powder ore wet ball pressing process is characterized by comprising the following steps of: (1) The preparation method comprises the following steps of (1) taking dolomite powder ore with the granularity of less than 20mm as a raw material, and adding auxiliary materials according to 3% -8% of the mass of the raw material, wherein the auxiliary materials are a mixture of white clay, OG mud and ferric oxide dander; (2) Mixing, namely adding water into the mixture of the raw materials and the auxiliary materials obtained in the step (1), and stirring until the mixture is uniform; (3) Extrusion molding, namely pressing the mixture obtained in the step (2) into pellets by a disc ball press; (4) Curing, namely naturally drying the pellets obtained in the step (3) until the moisture of the pellets is below 3%.
2. 2. The dolomite powder ore wet ball pressing process according to claim 1, wherein the adding proportion of the auxiliary material in the step (1) is 5% -7% of the mass of the raw material, and the white clay, the OG mud and the ferric oxide dander in the auxiliary material are mixed according to the equal mass ratio.
3. 3. The dolomite powder ore wet ball pressing process according to claim 1, wherein the external dimension of the pellets in the step (3) is 40-45 mm.
4. 4. The dolomite powder ore wet ball pressing process according to claim 1, wherein the natural drying time in the step (4) is 72 hours or more.
5. 5. The dolomite powder ore wet ball pressing process according to claim 1, wherein the pellets are uniformly spread and kept at a distance not adhered to each other during curing in the step (4).
6. 6. The dolomite powder ore wet ball pressing process according to claim 1, wherein the strength of the pellets prepared by the process reaches more than 800N/ball.

Description

Wet ball pressing process for dolomite powder ore Technical Field The invention relates to the technical field of metallurgical auxiliary raw material processing, in particular to a dolomite powder ore wet ball pressing process. Background Dolomite is used as an important auxiliary raw material in the metallurgical industry, can be used as a slag former in the steelmaking process, and is decomposed at high temperature to produce calcium oxide and magnesium oxide, which is a foundation for slag formation, can neutralize acid slag, improve the alkalinity of the slag, reduce the activity of FeO in the slag, improve the fluidity of steel slag, help to remove impurities in steel, reduce the corrosion of the slag to the furnace lining, prolong the service life of the furnace body, and simultaneously, the proper slag component can adjust the internal heat balance of the furnace to ensure the stable performance of the steelmaking process. Before the Dayou Jia calcium magnesium industry company is transferred from the wine steel, when the rotary kiln calcination technology is adopted to produce light calcined dolomite, the dolomite ore is about 5 ten thousand tons of dolomite ore which is left after secondary screening before entering the kiln and cannot be calcined through the rotary kiln, and the dolomite ore is piled in the factory of the Dayou Jia calcium magnesium industry company. The wine steel is used as a basic condition for using dolomite in the steel-making production process of a converter and an electric furnace in a ferrous metallurgy enterprise, but the granularity of the dolomite after secondary screening is less than 20mm, and the powder content is large. Because the existing tooling equipment of the wine steel has technical bottlenecks, each steelmaking process cannot normally use the dolomite powder ore, so that 5-thousand tons of dolomite powder ore is backlogged for a long time, the wine steel cannot exert the due value, and a series of potential safety hazards and environmental protection hazards are generated. In order to solve the problems, the invention provides a wet ball pressing process of dolomite powder ore, which is used for manufacturing the dolomite powder ore into a block and providing a new technical route for normal use of the dolomite powder ore in a steelmaking process. Disclosure of Invention The invention aims to provide a dolomite powder ore wet ball pressing process, which solves the problem that the existing dolomite powder ore cannot be directly used for steelmaking and long-term backlog, realizes resource recycling, reduces cost and reduces potential safety hazards and environmental protection. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a dolomite powder ore wet ball pressing process comprises the following steps: (1) The preparation method comprises the following steps of (1) taking dolomite powder ore with the granularity of less than 20mm as a raw material, and adding auxiliary materials according to 3% -8% of the mass of the raw material, wherein the auxiliary materials are a mixture of white clay, OG mud and ferric oxide dander; The auxiliary material is prepared by mixing white clay, OG mud and ferric oxide dander according to the equal mass ratio. The addition proportion of the auxiliary material is preferably 5% -7% of the mass of the raw material. The proportion range can ensure that the pellet strength reaches the use requirement (such as more than 800N/pellet) and simultaneously give consideration to the economical efficiency of the processing cost. (2) Mixing, namely adding water into the mixture of the raw materials and the auxiliary materials obtained in the step (1), and stirring until the mixture is uniform; The amount of water added is required to be adjusted according to actual conditions so as to ensure that the mixture reaches the humidity suitable for ball pressing, ensure that pellets with stable structure can be formed during extrusion molding, and avoid the deformation of the pellets caused by excessive water or the incapability of molding caused by insufficient water. (3) Pressing the mixture obtained in the step (2) into pellets with the external dimension of 40-45 mm by a disc ball pressing machine; (4) Curing, namely naturally drying the pellets obtained in the step (3) until the moisture of the pellets is below 3%. The natural drying time is 72 hours or more to ensure sufficient moisture reduction. During curing, the pellets are uniformly spread, and certain intervals are kept between the pellets, so that the pellets are prevented from being adhered to each other in the drying process. The dolomite powder ore pellets prepared by the process have the strength reaching more than 800N/ball and can meet the requirement of steelmaking production. The invention has the beneficial effects that: 1. the recycling method effectively solves the backlog problem of dolomite powder ore which cannot be