4results about How to "Increase cold strength" patented technology

The invention relates to the technical field of smelting additives, and discloses a preparation method of red mud cold-pressed pellets, which comprises the following steps: S1, raw material preparation: firstly, putting a raw material Bayer process red mud to be treated at a specified position so as to be conveniently treated by subsequent workers; a worker can adopt a manual pouring mode and can also adopt mechanical equipment to pour the materials into the stock bin (1). Compared with the prior art, the method has the following advantages and effects that the Bayer process red mud has large dispersity and is not prone to coalescence, red mud particles can be firmly bonded together by spraying the red mud cold-pressed pellet adhesive, the plasticity and the forming effect of the pellets are remarkably improved, the compressive strength and the wear resistance of the pellets are remarkably improved, and meanwhile the service life of the pellets is prolonged. After the adhesive is added, the pellet forming effect is very stable, the energy consumption is reduced, the production efficiency is improved, in addition, the pellet granularity is uniform, the wet pellet falling strength is more than 1.5 m < 2 > times and is complete, the dry pellet compressive strength reaches more than 100 kg, the cold strength is good, and the furnace burden requirement can be met.

The invention relates to the technical field of smelting, and discloses a dedusting ash cold-pressed pellet preparation method which comprises the following steps: S1, raw material preparation: firstly preparing required converter dedusting ash or gas ash, putting the raw materials into a raw material bin for use after the raw materials are prepared, and in order to ensure the iron element in the pellet and the stability of the pellet, preparing a raw material bin; wherein the fly ash or the gas ash with the total iron content of 55% is used. The fly ash anti-calcium oxide pellet adhesive has the advantages that after the fly ash anti-calcium oxide pellet adhesive and materials are stirred with water, high adhesion can be generated, a good adhesion effect is achieved, the pellet forming rate, the wet pellet anti-falling performance and the dry pellet compressive strength are improved, and secondly, the fly ash anti-calcium oxide pellet adhesive can be recycled. The fly ash anti-calcium oxide pellet adhesive can also inhibit the pellets from disintegration and pulverization in the drying or placing process, so that the cold strength of the pellets is improved, finally, the forming rate of the pellets is high, the fly ash pellets replace scrap steel to be put into a converter and used as a cooling agent, the reaction temperature in the converter can be reduced, and the whole steelmaking process is more stable.

The invention discloses a method for comprehensively improving the cold-state strength of alkaline pellets produced from bayan obo iron ore concentrate. The method is characterized in that raw materials comprise, by weight, 70%-75% of bayan obo iron ore concentrate, 25%-30% of common magnetite concentrate, 2.4%-2.8% of externally-matched bentonite and 2.5%-3.0% of externally-matched limestone. The invention aims to solve the problem of low cold-state strength of alkaline pellets prepared from Bayan Obo iron ore concentrate with high proportion, high natural alkalinity, poor pelletizing property and high volatile components in a chain grate machine-rotary kiln-circular cooler. The invention discloses a production technology for improving the cold-state strength of the alkaline pellets by comprehensively applying a high-pressure roller grinding pretreatment technology, binder type optimization and other comprehensive technical measures on a chain grate machine, a rotary kiln and a circular cooler, and creates better raw material conditions for high-pellet-ratio smelting of the alkaline pellets in a blast furnace.

This invention relates to the field of metal production or refining technology, specifically to a method for preparing composite alkaline pellets with reduced adhesion rate. The method includes the following steps: 1) preparation of homogeneous pellet batching and determination of homogeneous pellet adhesion rate; 2) preparation of composite pellet batching; 3) staged pelletizing; 4) oxidative calcination; and 5) performance testing and qualification judgment of the finished pellets. This method effectively reduces the adhesion rate of composite alkaline pellets, thereby improving the yield of composite alkaline pellets.