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Method for controlling energy saving and environment protecting laterite nickel ore smelting shaft furnace temperature by silicothermic process

An energy-saving and environmentally friendly laterite nickel ore technology, which is applied in the energy-saving and environmentally friendly shaft furnace smelting of laterite nickel ore, and the field of online temperature control of laterite nickel ore smelting plus ferrosilicon, can solve the problems of slow smelting temperature rise, lower production efficiency, and prolong smelting time. , achieve the effect of saving production time, improving recovery rate and good slag making effect

Inactive Publication Date: 2014-07-16
FUSHUN HANKING DRI CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

However, it is precisely because of the wet ball entering the furnace that the smelting temperature in the furnace rises slowly, which prolongs the smelting time and reduces the production efficiency.

Method used

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  • Method for controlling energy saving and environment protecting laterite nickel ore smelting shaft furnace temperature by silicothermic process
  • Method for controlling energy saving and environment protecting laterite nickel ore smelting shaft furnace temperature by silicothermic process

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Embodiment Construction

[0047] 1. Establish a temperature curve. When the temperature of the melting zone reaches 1600°C, a thermocouple is inserted into the core to represent the center of the zone for detection. Then, the thermocouple is inserted into the zone furnace lining close to the inner surface to measure the temperature, and each zone is measured in turn to calculate the temperature gradient and the corresponding The gradient coefficient of the temperature is established, and the temperature standard curve is programmed into the monitoring expert system program.

[0048] 2. During the production process, the lining temperature is detected online, and the lining temperature is compared with the curve temperature, and the deviation ideal temperature value is automatically calculated.

[0049] 3. Calculate the amount of ferrosilicon block to be added according to the temperature deviation value and silicon calorific value.

[0050] 4. Preheat the top center of the ferrosilicon block material pr...

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Abstract

Belonging to the field of laterite nickel ore production, the invention relates to a method for controlling the temperature of an energy saving and environment protecting laterite nickel ore smelting shaft furnace by a silicothermic process. The method is characterized in that: first, furnace charge smelting is divided into five areas, i.e. preheating, reduction, combustion, melting and separation, then temperature measuring is conducted, after measuring the surrounding temperature value, contrastive analysis is carried out by a monitoring expert system, and a center temperature variation value is calculated. The needed absorption heat is calculated through the temperature variation value, and accordingly, the adding amount of ferrosilicon can be determined. The high calorific value of silicon can be utilized to capture blown oxygen and oxygen in raw ore. The generated silicon oxide enters a slag flow, and the reaction area temperature can be rapidly raised to reach the standard reaction temperature. The expert monitoring system involved in the method is automated and can make timely response. After ferrosilicon is added to the raw materials, temperature rise become rapid, the production efficiency is high, and meanwhile, the recovery rate of metallic nickel is improved, so that considerable economic benefits can be achieved.

Description

technical field [0001] The invention belongs to the field of laterite nickel ore production, and relates to an energy-saving and environment-friendly shaft furnace smelting method for laterite nickel ore, in particular to an online temperature control method for smelting laterite nickel ore and adding ferrosilicon. Background technique [0002] Previously, our company applied for an invention patent for an energy-saving and environmentally friendly shaft furnace smelting method for laterite nickel ore. It adopts a smelting process without sintering and wet balls into the furnace, which not only saves sintering energy, but also plays a role in the distribution area through wet balls. The function of filtering smoke and dust makes a large amount of smoke and dust absorbed by the steam generated by the wet bulb heating process when passing through the material distribution area, thereby reducing the smoke and dust content in the flue gas. The pellets are also sintered and dried ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02
Inventor 田强赵宙陈玉荣王平
Owner FUSHUN HANKING DRI CO LTD
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