Manufacturing method of green pellets

A manufacturing method and technology of green pellets, applied in the field of green pellet manufacturing, can solve problems such as difficult dehydration of green pellets, easy cracking, and poor quality of green pellets, so as to reduce the probability of cracking, improve quality, and improve thermal performance Effect

Active Publication Date: 2018-11-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of adding starch as a medicament to the pulp, it is difficult to dehydrate the green pellets after the iron co

Method used

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  • Manufacturing method of green pellets

Examples

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Example Embodiment

[0046] Example 1

[0047] In this embodiment, in the filtration step after the beneficiation step, 30% (by mass percentage) sulfuric acid solution is added to the slurry, and at the same time or later, the dust removal ash in the plant is also added to the slurry "in advance". The "advanced" here is relative to the prior art method described in the background technology, where the in-plant dedusting ash is added when "balling".

[0048] Specific steps are as follows:

[0049] (1) Provide sulfuric acid solution: formulate concentrated sulfuric acid into 30% (by mass percentage) sulfuric acid solution.

[0050] (2) Add sulfuric acid solution into the pulp: 30% sulfuric acid solution is added into the pulp, the consumption of the sulfuric acid solution is 355g / t pulp.

[0051] (3) Adding the dedusting ash in the plant to the pulp: The amount of dedusting ash in the plant is 80kg / t of pulp.

[0052] (4) Filter the ore pulp to obtain iron concentrate powder.

[0053] (5) Use iron concentrate ...

Example Embodiment

[0064] Example 2

[0065] In this embodiment, in the filtering step after the beneficiation step, 30% (by mass percentage) sulfuric acid solution is added to the slurry, and the dust removal ash in the plant is also added to the slurry in advance.

[0066] Specific steps are as follows:

[0067] (1) Provide sulfuric acid solution: formulate concentrated sulfuric acid into 30% (by mass percentage) sulfuric acid solution.

[0068] (2) Add sulfuric acid solution to the pulp: 30% sulfuric acid solution is added to the pulp, the consumption of sulfuric acid solution is 395g / t pulp.

[0069] (3) Adding the dedusting ash in the plant to the pulp: The amount of dedusting ash in the plant is 80kg / t of pulp.

[0070] (4) Filter the ore pulp to obtain iron concentrate powder.

[0071] (5) Use iron concentrate powder to pelletize to obtain green pellets.

[0072] The iron ore concentrate and bentonite are mixed according to the following weight percentages, and the specific ratio is:

[0073] 98.5 par...

Example Embodiment

[0082] Example 3

[0083] In this embodiment, in the filtering step after the beneficiation step, 30% (by mass percentage) sulfuric acid solution is added to the slurry, and the dust removal ash in the plant is also added to the slurry in advance.

[0084] Specific steps are as follows:

[0085] (1) Provide sulfuric acid solution: formulate concentrated sulfuric acid into 30% (by mass percentage) sulfuric acid solution.

[0086] (2) Add sulfuric acid solution into the pulp: 30% sulfuric acid solution is added into the pulp, and the consumption of the sulfuric acid solution is 435g / t pulp.

[0087] (3) Adding the dedusting ash in the plant to the pulp: The amount of dedusting ash in the plant is 80kg / t of pulp.

[0088] (4) Filter the ore pulp to obtain iron concentrate powder.

[0089] (5) Use iron concentrate powder to pelletize to obtain green pellets.

[0090] The iron ore concentrate and bentonite are used as ingredients according to the following weight percentages. The specific rati...

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Abstract

The invention discloses a manufacturing method of green pellets. The manufacturing method comprises the steps of beneficiation; filtering, wherein after the step of beneficiation is finished, when orepulp is filtered, a certain quantity of sulfuric acid solution is firstly added into the ore pulp, dust is removed in a plant, then the ore pulp is filtered, and therefore iron ore concentrate powderis obtained; and pelletizing, wherein the iron ore concentrate powder is used for pelletizing to obtain the green pellets. According to the manufacturing method, when the ore pulp is filtered after the beneficiation process is finished, a certain quantity of sulfuric acid solution is added into the ore pulp, dust is removed in the plant, and then the iron ore concentrate powder is obtained afterthe ore pulp is filtered. Tests show that the green pellets manufactured through the iron ore concentrate powder can greatly reduce the cracking probability under the high temperature drying condition. Thus, by means of the manufacturing method, the heat performance of the green pellets can be improved, and the quality of the green pellets can be improved easily.

Description

technical field [0001] The invention relates to the technical field of manufacturing methods of iron ore powder pellets, in particular to a manufacturing method of green pellets. Background technique [0002] Iron concentrate is the main iron material for the production of pellets. Traditionally, iron ore concentrate powder is obtained by finely grinding raw ore with low iron grade in a ball mill, then going through the beneficiation process to obtain ore pulp, and then filtering the ore pulp to obtain iron ore powder with a moisture content of about 8-10%. In the beneficiation process, in order to improve the iron grade of iron ore concentrate powder, a part of the flotation process is adopted, and starch is added as a reagent to improve the flotation efficiency. Due to the high moisture content of iron ore powder after flotation, it is necessary to dry and dehydrate the iron ore powder in the drying kiln before producing pellets, so as to obtain iron concentrate with suit...

Claims

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Application Information

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IPC IPC(8): C22B1/248
CPCC22B1/2406C22B1/248
Inventor 范建军史永林臧龙崔建春王磊李昊堃高晓梅李泽岩蔡湄夏
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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