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Preparation method of calcium ferrite

A technology of calcium ferrite and calcium sulfate, applied in the field of metallurgy, can solve the problems of low utilization value, waste of resources, etc., and achieve the effects of high added value, high conversion rate, and easy promotion.

Inactive Publication Date: 2014-06-18
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention mainly uses pyrite and gypsum to react to prepare sulfuric acid, and at the same time obtain cement clinker, in which sulfur element has been fully utilized, but iron and calcium as cement clinker have low utilization value and waste a lot of valuable resources

Method used

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Examples

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preparation example Construction

[0034] The preparation method of calcium ferrite of the present invention is characterized in that: comprises the steps:

[0035] (a) Take gypsum, pyrite and iron supplement and mix them to obtain a mixed material;

[0036] Among them, calcium sulfate in gypsum: ferrous disulfide in pyrite: iron element in iron supplement = 1:0.1~2.5:0~2 in molar ratio, and calcium element in mixed material in molar ratio: iron element=1: 1-2.5, the moisture content of the gypsum is less than 10wt%, and the moisture content of the pyrite is 0.1-15wt%;

[0037] (b) Calcining the mixed material in a protective atmosphere, the roasting temperature is 900-1500°C, the roasting time is 0.1-4h, after the roasting is completed, cool down to obtain calcium ferrite;

[0038] Wherein, the protective atmosphere is an inert atmosphere, a reducing atmosphere or an oxidizing atmosphere with an oxygen content of less than 5wt%.

[0039] The iron supplement mentioned in the present invention is a substance c...

Embodiment 1

[0052] The preparation of embodiment 1 calcium ferrite

[0053] (a) Grind phosphogypsum hemihydrate with a moisture content of 3wt% and pyrite with a moisture content of 15wt% evenly, the molar ratio of the active ingredient ferrous disulfide in the pyrite and the active ingredient calcium sulfate in the phosphogypsum is 0.4:1, adding iron supplement is ferric oxide, and the molar ratio of calcium sulfate in ferric oxide and gypsum is 0.5:1, to obtain a mixed material;

[0054] (b) Put the mixed material into a reactor at a temperature of 950°C, and roast it for 4 hours under a protective atmosphere (nitrogen, carbon monoxide and sulfur dioxide), and cool the solid phase to obtain calcium ferrite, and produce sulfuric acid from the tail gas of sulfur dioxide.

[0055] In Example 1, the decomposition rate of pyrite was 95%, and the decomposition rate of phosphogypsum was 90%. The molar ratio of iron element: calcium element in the prepared calcium ferrite was 2.1:1.

Embodiment 2

[0056] The preparation of embodiment 2 calcium ferrite

[0057] (a) Grind anhydrous phosphogypsum with a moisture content of 0.1wt% and pyrite with a moisture content of 10wt% evenly. The ratio is 0.1:1, the iron supplement added is ferrous oxide, and the molar ratio of ferrous oxide to calcium sulfate in gypsum is 2:1 to obtain a mixed material;

[0058] (b) Put the mixed material into a reactor at a temperature of 1100°C, and roast it for 2.0 hours under a protective atmosphere (nitrogen, carbon dioxide, and sulfur dioxide). The solid phase is cooled to obtain calcium ferrite, and sulfur dioxide tail gas is produced to produce sulfuric acid.

[0059] In Example 2, the decomposition rate of pyrite was 99%, and the decomposition rate of phosphogypsum was 95%. The molar ratio of iron element: calcium element in the prepared calcium ferrite was 2.21:1.

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Abstract

The invention relates to a preparation methodof calcium ferrite, which belongs to the technical field of metallurgy. The method comprises the following steps of: (a) mixing gypsum, pyrite and iron supplements to obtain a mixed material, wherein the molar ratio of calcium sulphate in gypsum to ferrous disulfide in pyrite to iron element in the iron supplements is 1: (0.1-2.5): (0-2), the molar ratio of calcium element to the iron element in the mixed material is 1: (1-2.5), the water content of the gypsum is less than 10wt%, and the water content of the pyrite is 0.1-15wt%; and (b) roasting the mixed material for 0.1-4 hours at a roasting temperature of 900-1500 DEG C under a protective atmosphere, and after the roasting is finished, cooling to obtain calcium ferrite, wherein the protective atmosphere is an inert atmosphere or a reductive atmosphere or an oxidative atmosphere with an oxygen content of less than 5 wt%.

Description

technical field [0001] The invention relates to a preparation method of calcium ferrite, which belongs to the technical field of metallurgy. Background technique [0002] As we all know, phosphorus is usually a harmful element in steel. Excessive content will cause cold and brittle steel to affect the mechanical properties of steel. Among the current dephosphorization agents, calcium ferrite has obvious advantages. Because of its good fluidity, it can accelerate the dissolution of lime, so there is no need to use fluorite for fluxing, and it has strong oxidizing properties. Compared with the non-dephosphorization method, the oxygen consumption is less, and it has good dephosphorization kinetic conditions, realizes fluorine-free steelmaking, reduces furnace lining erosion, and reduces environmental pollution. At the same time, due to the good calcified slag, stable smelting, and reduced molten steel splashing, it can increase the yield rate of the steel industry by about 1%....

Claims

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Application Information

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IPC IPC(8): C01G49/00C21C7/064
CPCC01G49/0036
Inventor 杨林罗显明张志业罗蜀峰王辛龙马先林陈晓东付全军
Owner SICHUAN UNIV
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