31results about How to "Shorten the reduction reaction time" patented technology

The invention discloses an aluminum-barium wire and a production process thereof. The aluminum-barium wire comprises a coating and a core powder, wherein the core powder comprises (wt%) 70 to 80% of aluminum powder, 5 to 10% of aluminum granules and 15 to 25% of barium carbonate, and the coating is made of strip steel. The production process comprises a step of preparation of a core material and a step of coating. The aluminum-barium wire produced in the invention is hard to break off, can realize in-depth deoxidation, reduces loss of elemental aluminum and barium, improves an alloy recovery rate and decreases cost for each ton of steel.

The invention discloses a rapid reduction process of a rotary kiln for laterite nickel ore. The rapid reduction process of the rotary kiln for the laterite nickel ore includes the following steps that laterite nickel ore and a composite adding agent are mixed and then are pressed into block masses, and the composite adding agent comprises pulverized coal and limestone; the block masses are dried and pre-heated, and then enter the rotary kiln, reduction coal is added in, and reduction is performed under the reduction atmosphere so that reduced products can be obtained; the reduced products are cooled, screened and magnetically separated so that magnetic products can be obtained; and the magnetic products are crushed, subjected to ore grinding and magnetically separated, and high-nickel concentrate is obtained. According to the rapid reduction process of the rotary kiln for the laterite nickel ore, the low grade laterite nickel ore serves as raw materials, three manners that fuel is matched in the block masses, the block masses are preheated in a vertical furnace and coal is fed through hot air are developed to guarantee that the laterite nickel ore block masses are contained in the kiln while being hot, high temperature rapid reduction of the whole kiln is achieved, and therefore the rotary kiln temperature is lowered, the reduction time is shortened, and the high-nickel concentrate is effectively manufactured from the low grade laterite nickel ore.

The invention discloses a reduction kettle, which comprises a kettle body (1), the kettle body is a box body or a cylinder structure, the bottom or the top of the kettle body is arranged at an inclination, and the front and rear side walls of the reduction kettle in the kettle body are arranged in parallel or in a horizontal array The radiant tube (2) runs through the kettle body, a slag discharge outlet (3) is provided on the side kettle body at the lowest point of the bottom of the kettle body, and an auxiliary slag discharge outlet (3) is provided on the kettle body opposite to the slag discharge outlet at the highest point of the bottom of the kettle body ( 4), the highest point on the top of the kettle body is provided with a charging port (5), and the kettle body on the side of the highest point on the top of the kettle body is provided with a metal vapor vacuum exhaust port (6). The invention can reduce reduction reaction time, improve production capacity and reduce energy consumption. Extend the service life of the reduction kettle. The slag discharge is easier, which can improve the slag discharge efficiency and reduce the loss of heat energy. The collection of metal vapor is convenient. The product has high purity.

The invention discloses a method for eliminating local differential pressure in a vacuum smelting reduction kettle, which comprises the following steps of: arranging a metal vapor vacuum pumping hole or a crystallizer interface on the reduction kettle; and disposing a metal vapor guide channel in the reduction kettle, so that the metal vapor can escape into a metal collector or the crystallizer along the guide channel. The reduction kettle (4) adopted by the method has a rectangular or round box body with a bevel bottom structure and has a bottom inclined by an angle of 30 to 60 DEG. The metal vapor vacuum pumping hole (6) is provided on the kettle body on the highest point side on the top of the reduction kettle, an air guide groove (2) pointing to the metal vapor vacuum pumping hole is provided on the inner wall of the reduction kettle, a radiation pipe (1) with the air guide groove and penetrating in the kettle is vertically or horizontally arranged in the reduction kettle, or an air guide groove is provided on a heat conductor arranged on the radiation pipe. The invention can effectively eliminate local differential pressure in the vacuum smelting reduction kettle to successfully guide the metal vapor produced by reduction reaction, thus holding the pressure environment in the reduction kettle and ensuring the smooth execution of the reduction reaction.

A process for producing reduced ilmenite in a rotary kiln. The ilmenite, reducing agent, and desulfurizing agent are prepared as raw materials, added to the rotary kiln, and heated to 1050-1180°C in a reducing atmosphere for reduction. The pressure of the reducing atmosphere is kept at Between 0-4mm water column, obtained by cooling, screening, magnetic separation, impact winnowing, and blending. The weight ratio of reducing agent and ilmenite in the raw material is 0.3-0.6:1, and the weight of desulfurizing agent and reducing agent The ratio is 0.02~0.2:1. The method realizes continuous flow operation, greatly improves production efficiency, shortens the reduction reaction time, and is easy to control the uniformity of temperature, thereby ensuring stable product quality and meeting the needs of producing welding electrodes.