Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method

A submerged arc furnace and pellet technology, applied in the field of metal smelting, can solve problems such as environmental pollution and high energy consumption of the system, and achieve the effects of reducing dust pollution, large processing capacity, and reducing energy consumption

Inactive Publication Date: 2015-05-06
丰镇市新太新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole system consumes a lot of ene

Method used

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  • Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method
  • Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method
  • Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] see figure 2 . The system of pre-reduction of chrome ore pellets and direct supply to the submerged arc furnace is abbreviated as GQYZ technology according to the pinyin. It includes a Φ6m disc pelletizer 6 set at a height of 50m from the ground, which is connected to a grate machine 10, a 4×60m pre-reduction rotary kiln 11,

[0049] The feeding port of the disc pelletizer 6 is connected with a batching unit through a B650 belt 5 . The discharge port of the pelletizing machine is connected to the feed port of the grate machine 11 through the swing head belt 7, the large ball round roller screen 8, and the roller screen distributor 9 in sequence, and the discharge port of the chain grate machine is connected to the pre-reduction rotary The feed port of the kiln; the discharge port of the pre-reduction rotary kiln is connected to the submerged arc furnace;

[0050] The pelletizer, chain grate, and pre-reduction rotary kiln are supported by reinforced concrete structur...

Embodiment 2

[0055] Use the direct supply system of embodiment 1, technological process such as figure 1 . The annual consumption of bentonite is 0.3 million tons (dry). The low calorific value of coke powder used for pelletizing is 7200-7400Kcal / kg. The pulverized coal used in the rotary kiln has a low calorific value of 5800-6000Kcal / kg.

[0056] Pre-reduction pellet process:

[0057] (1) Raw materials, fuels and adhesives accept:

[0058] Chromium concentrate powder is transported by car to the raw material yard for stockpiling; the binder is bentonite, also known as bentonite, which is sent to the bentonite mine tank by manual unpacking.

[0059] Coke powder (used for pellet batching) and coal powder (coal powder used for rotary kiln roasting) are directly sent to the coal shed by car, loaded by a loader, and sent to the raw coal bunker (shared) in the powder plant building through a bucket elevator .

[0060] (2) Drying of chrome concentrate powder

[0061] Since the chrome con...

Embodiment 3

[0077] Use the direct supply system of embodiment 1, raw material is with embodiment 2.

[0078] Pre-reduction pellet technology differs from Example 2:

[0079] (3) Ingredients

[0080] According to the resource situation, the batching room adopts a single-row setting for the feed tank, and the batching tank is designed to store chrome concentrate powder, binder, and coke powder respectively. 2 o 3 Content up to 10-14%, SiO 2 Content up to 4-5%, Cr 2 o 3 Content up to 40-45%, TFe content up to 20-25%, for batching. The batched mixture is sent to a dry ball mill for grinding.

[0081] (4) Humidification and grinding process

[0082] In order to ensure that the batch material and water are fully mixed, improve and stabilize the quality of the pellets, and stabilize the roasting process, a humidification and moistening process is selected. Through humidification, control moisture 5-6%.

[0083] (5) Ball making

[0084] The pelletizing room is equipped with a mixing bin...

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Abstract

The invention belongs to the field of metallurgy, and provides a chromium ore pellet pre-reduction direct-supply submerged arc furnace system, which comprises a pelletizer, a chain grate and a pre-reduction rotary kiln, wherein the material inlet of the pelletizer is connected with a material preparing unit through a belt, the material outlet of the pelletizer is connected with the material inlet of the chain grate, the material outlet of the chain grate is connected with the material inlet of the pre-reduction rotary kiln, the material outlet of the pre-reduction rotary kiln is connected with a submerged arc furnace, and the pelletizer, the chain grate and the pre-reduction rotary kiln are arranged on the place 30-50 m far away from the ground. According to the method of the present invention, the cooling process during the oxidized pellet production process is eliminated, and the direct hot material feeding-into-furnace process is adopted, such that the secondary energy source consumption is reduced, and the hot charging direct-supply can be achieved; the pelletizer, the chain grate and the pre-reduction rotary kiln are arranged by adopting the high frame, the highest place is 50 m, and the hot material is directly supplied to the submerged arc furnace; and the hot material-cold material exchange can be achieved, the whole production achieves the flexible regulation, and the passive situation that the furnace stops along with the kiln stopping and the kiln stops along with the furnace can be avoided.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a pre-reduction system and a direct supply method for submerged arc furnaces. Background technique [0002] With the rapid growth of domestic construction, the output of the metallurgical industry continues to rise, the lump ore of the ore used in metallurgy is also decreasing, and the proportion of fine ore is increasing. Moreover, the chrome-depleted ore obtained after beneficiation is all chrome concentrate powder ore, and artificial lump ore should be produced by pelletizing, sintering and briquetting. The main process used is: during the pre-reduction of chrome ore powder, grind chrome ore powder and coke to a certain fineness, fully mix with binder, after granulation or briquetting, dry and dehydrate, and then use tunnel kiln or Thermal equipment such as shaft furnaces or rotary kilns is a processing technology for pre-reducing granular or massive chromium-contain...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B4/04C22B4/08C22B34/32
Inventor 马远征
Owner 丰镇市新太新材料科技有限公司
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