Whole-body two-sided flame separating type heating rotary kiln and method for producing direct reduction iron co-production carbon base fertilizer

A rotary kiln, double-sided technology, applied in the direction of rotary drum furnace, furnace, furnace type, etc., can solve the problems of short reduction kiln, small kiln scale, instability, etc., to increase production capacity, reduce investment, reduce The effect of the specification

Active Publication Date: 2017-05-10
辽宁盛京时代科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's current direct reduced iron technology is relatively lagging behind. The annual output of reduced iron is less than 600,000 tons, accounting for less than 1% of the world's total output of reduced iron.
[0020] In the existing external heating (flame separation) rotary kiln in the market, due to the supporting device of supporting ring and supporting wheel in the middle of the kiln, only the supporting ring and supporting wheel can be left in the heating furnace, and the high temperature section of the kiln is disconnected. , cannot be heated for a long distance, and the temperature curve is wavy, forming a segmented external heating (flame-type) rotary k

Method used

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  • Whole-body two-sided flame separating type heating rotary kiln and method for producing direct reduction iron co-production carbon base fertilizer
  • Whole-body two-sided flame separating type heating rotary kiln and method for producing direct reduction iron co-production carbon base fertilizer
  • Whole-body two-sided flame separating type heating rotary kiln and method for producing direct reduction iron co-production carbon base fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Add 45% biomass carbonized particles according to the weight of iron oxide scale, particle size ￠8mm×6mm, mix the two into the flame-type rotary kiln, reduce at 1080°C for 2.5h, and discharge through the cooling section, It is covered and protected by biomass material particles, cooled to 150°C by a cooling drum, and the direct reduced iron product of 1-20mm is separated by dry magnetic separation, and then polished to a fineness of 0-1mm, which is high-quality chemical metal iron powder , water purifying agent or reduced iron powder product; take the dried and carbonized biomass carbon materials separated by dry magnetic separation with a particle size of 0-8mm, and sieve out the coarse particles with a fineness of 2-8mm as The reducing agent is recycled, and the mixture with a fineness of 0-2 mm under the sieve is a by-product of carbon-based fertilizer.

[0106] The product indicators are as follows:

[0107] 1) Reduced iron products

[0108]

[0109] 2) Carbon-...

Embodiment 2

[0112] Add 50% biomass carbon particles (after the straw is squeezed and dried) according to the weight of the wire-drawn oxide scale, the particle size is ￠8mm×8mm, put the two into the flame-type rotary kiln, and reduce it at 1050°C for 2.6h. After the cooling section is discharged, it is covered with biomass material particles for protection, and cooled to 150°C by a cooling drum; the 1-20mm direct reduced iron product separated by dry magnetic separation is cold-pressed into pellets, which are used as smelting high-quality The reduced iron product of special steel is the metal cold briquetting (MBI) product; take the dried and dry-distilled biomass carbon material with a particle size of 0-8mm separated by dry magnetic separation, and screen out the fineness of 2 Coarse particles of -8mm are recycled as a reducing agent, and the mixture with a fineness of 0-2mm under the sieve is a by-product of carbon-based fertilizer.

[0113] The product indicators are as follows:

[0...

Embodiment 3

[0120] Crush and sort the gas-cutting slag into 2-10mm particles, add 48% carbonized biomass carbon particles according to the weight of the gas-cutting slag, and the particle size is ￠6.5mm×7mm. Reduction for 2.8 hours, after being discharged from the cooling section, covered with biomass material particles for protection, and cooled to 180°C through a cooling drum; take the 1-20mm direct reduced iron product separated by dry magnetic separation, and grind it into a 0- 1mm fineness, that is, high-quality chemical metal iron powder, water purifying agent or reduced iron powder products; take the dried and dry-distilled biomass carbon materials with a particle size of 0-8mm separated by dry magnetic separation, and screen out the fine Coarse particles with a fineness of 2-8mm are recycled as a reducing agent, and the mixture with a fineness of 0-2mm under the sieve is a by-product of carbon-based fertilizer.

[0121] The product indicators are as follows:

[0122] 1) Reduced i...

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Abstract

The invention relates to a whole-body two-sided flame separating type heating rotary kiln and a method for producing direct reduction iron co-production carbon base fertilizer. According to the invention, a rotary kiln cylinder is composed of two cylinders namely an outer cylinder and an inner cylinder; an in-depth reduction chamber is formed between the outer cylinder and the inner cylinder and is divided into 6 to 12 in-depth reduction chambers by support partition boards; each separated in-depth reduction chamber is filled with equivalent reduced material, the filling rate is increased by 6 to 12 times, and the productivity of direct reduction iron of the rotary kiln is also increased by 6 to 12 times, so that the production capacity of the kiln is greatly improved, the kiln size is relatively reduced, and the investment on the kiln is also greatly reduced relatively. Except carbon, biomass materials including straws and the like can be used as a reduction agent, so that pollution to the environment caused by combustion of the biomass materials is avoided, waste materials are recycled, high-concentration coal gas and by-products of co-production biochar base fertilizer are recycled, energy conservation, emission reduction and carbon drop are realized, and NOx is not generated.

Description

technical field [0001] The invention belongs to the field of metallurgical equipment and agricultural technology, and in particular relates to a whole-body double-sided flame-insulated heating rotary kiln and a method for co-producing carbon-based fertilizer by direct reduction of iron. Background technique [0002] Crop straw is an excellent biomass energy, and it has a large output every year. In recent years, during the summer harvest and autumn and winter, there are always a large amount of wheat, corn and other straws burned in the field, which produces a lot of thick smoke. Not only It has become the bottleneck of rural environmental protection, and even the chief culprit of the urban environment. Crop straw has become a new source of pollution in rural areas. As a large agricultural country, our country can generate more than 700 million tons of straw every year, which has become "waste" that is "not very useful" but must be disposed of. If it is completely handled b...

Claims

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Application Information

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IPC IPC(8): C21B13/08C05D9/00
CPCC05D9/00C21B13/08
Inventor 唐竹胜唐佳
Owner 辽宁盛京时代科技有限公司
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