Method and system for preparing sulfuric acid and direct reduction iron from pyrite

A technology of pyrite and reduced iron, which is applied in the field of pyrite to prepare sulfuric acid and direct reduction of iron, which can solve the problems of limiting the application range and quantity of sulfuric acid slag, and the amount of sulfuric acid slag added cannot exceed

Pending Publication Date: 2018-05-08
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because sulfuric acid slag contains a certain amount of zinc and sulfur, and zinc and sulfur are particularly harmful elements to the blast furnace ironmaking process, thus

Method used

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  • Method and system for preparing sulfuric acid and direct reduction iron from pyrite
  • Method and system for preparing sulfuric acid and direct reduction iron from pyrite
  • Method and system for preparing sulfuric acid and direct reduction iron from pyrite

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specific Embodiment

[0043] According to one aspect of the present invention, the present invention proposes a method for preparing sulfuric acid and direct reduction iron from pyrite. According to a specific embodiment of the present invention, the method includes: (1) finely grinding the pyrite, so that Obtain pyrite powder; (2) carry out mixed molding process with pyrite powder and water, binding agent and additive, so that obtain mixed pellet; (3) supply mixed pellet to chain grate machine and carry out drying, the second First preheating and second preheating, in order to obtain preheated pellets; (4) supply the preheated pellets to the rotary kiln for oxidation roasting treatment, in order to obtain oxidation roasted pellets and sulfur-containing flue gas; (5) use Sulfur flue gas is used to make acid to obtain sulfuric acid and acid-removing flue gas; (6) Supply the oxidized and roasted pellets to the air-based shaft furnace for direct reduction treatment with reducing gas to obtain zinc-cont...

Embodiment 1

[0098] Finely grind the selected pyrite to -200 mesh, accounting for more than 60%, and mix the finely ground pyrite, water, binder bentonite, and additive calcium oxide at a mass ratio of 100:8:0.83:0.77 to make pellets , the particle size of the pellets is 10-18mm, accounting for 90%. After the pellets are screened, they are transported to the grate machine-rotary kiln, dried at 250°C for 8 minutes, preheated at 400-600°C for 5 minutes, and preheated at 600-1200°C. Heat for 4 minutes, oxidize and roast at 1200-1250°C for 8 minutes, principle of oxidation and roast: FeS 2 +O 2 =Fe 2 o 3 +SO 2 , ZnS+O 2 =ZnO+SO 2 ↑ Roasting produces flue gas and solid oxidized pellets, SO 2 Acid production is recovered from the flue gas, and the oxidized pellets are sent to the gas-based shaft furnace for direct reduction. The main component of the reduced gas is H 2 +CO content is 80%, the temperature of the reducing gas is heated to 950°C, the temperature in the reduction section of t...

Embodiment 2

[0106] Finely grind the selected pyrite to -200 mesh, accounting for more than 60%, and mix the finely ground pyrite, water, binder bentonite, and additive calcium fluoride at a mass ratio of 100:6:0.62:0.98 to make Balls, pellets with a particle size of 10-18mm account for 90%. After screening, the finished pellets are transported to the grate machine-rotary kiln, baked at 250°C for 3 minutes, preheated at 400-600°C for 4 minutes, and preheated at 600-1200°C. Heat for 4 minutes, oxidize and roast at 1200-1250°C for 5 minutes, principle of oxidation and roast: FeS 2 +O 2 =Fe 2 o 3 +SO 2 , ZnS+O 2 =ZnO+SO 2 ↑ Roasting produces flue gas and solid oxidized pellets, SO 2 Acid production is recovered from the flue gas, and the oxidized pellets are sent to the gas-based shaft furnace for direct reduction. The main component of the reduced gas is H 2 The +CO content is above 85%, the temperature of the reducing gas is heated to 850°C, the temperature in the reduction section o...

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Abstract

The invention discloses a method and system for preparing sulfuric acid and direct reduction iron from pyrite. The method comprises the following steps of (1) carrying out fine grinding treatment on the pyrite so as to obtain pyrite powder; (2) carrying out mixing forming treatment on the pyrite powder, water, a binder and an additive so as to form mixed pellets; (3) feeding the mixed pellets to achain grate machine for drying, first preheating and second preheating so as to obtain preheated pellets; (4) feeding the preheated pellets to a rotary kiln for oxidation roasting treatment so as toobtain oxidation-roasted pellets and sulfur-contained flue gas; (5) preparing acid by utilizing the sulfur-contained flue gas so as to obtain the sulfuric acid and acid-removed flue gas; and (6) feeding the oxidation-roasted pellets to a the gas-based shaft furnace for direct reduction treatment with reducing gas so as to obtain zinc-contained flue gas and a direct reduction iron product. According to the method, the sulfur recovery rate in the pyrite can be effectively increased, the process flow can be shortened, the high-quality direct reduction iron can be effectively produced by using theroasted oxidized pellets, the utilization rate of resources can be increased, and a high-quality raw material can be provided for producing high-end castings and high-grade steel.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and metallurgy. Specifically, the invention relates to a method and a system for preparing sulfuric acid and direct reduction iron from pyrite. Background technique [0002] With the advancement and development of modern industrial technology, the demand for mineral resources is increasing, but mineral resources are non-renewable, and due to continuous mining, mineral resources are becoming increasingly exhausted. The contradiction between resource depletion and resource demand growth is becoming more and more prominent. Therefore, the effective use of existing mineral resources is an important issue for the development of today's society. [0003] Pyrite is composed of iron and sulfur. Under the current technical and economic conditions, only the sulfur can be effectively used, and the iron in it becomes sulfuric acid slag while utilizing sulfur. The iron content in the slag ranges from...

Claims

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Application Information

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IPC IPC(8): C21B13/02C01B17/74C22B1/243C22B1/02
CPCC21B13/02C01B17/74C21B13/0073C21B13/008C22B1/02C22B1/243
Inventor 邓君韩志彪冯鲁兴唐敬坤吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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