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Method for preparing sulfate/silicate-resistant cement clinker by taking low-aluminum stone coal vanadium-extracting slag and nitric phosphate slag as main raw materials

A technology of portland cement and nitrophosphate fertilizer, which is applied in cement production, etc., can solve problems such as large environmental loads and safety hazards, and achieve the effects of reducing grinding costs, high mixing degree, and good grindability

Inactive Publication Date: 2014-02-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Extracting vanadium from stone coal will inevitably produce a large amount of waste slag. These slags from stone coal vanadium extraction are basically disposed of by stacking, which causes a great environmental load and also poses a serious safety hazard.
However, there is no report on the preparation of sulfate-resistant Portland cement clinker using low-alumina stone coal vanadium extraction slag and nitrophosphate fertilizer slag as the main raw materials.

Method used

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  • Method for preparing sulfate/silicate-resistant cement clinker by taking low-aluminum stone coal vanadium-extracting slag and nitric phosphate slag as main raw materials
  • Method for preparing sulfate/silicate-resistant cement clinker by taking low-aluminum stone coal vanadium-extracting slag and nitric phosphate slag as main raw materials
  • Method for preparing sulfate/silicate-resistant cement clinker by taking low-aluminum stone coal vanadium-extracting slag and nitric phosphate slag as main raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The vanadium extraction slag obtained by using stone coal through fluidized bed furnace decarbonization roasting, rotary kiln oxidation roasting, acid leaching and other processes is used as siliceous raw material, nitrophosphate fertilizer slag is used as calcium raw material, Al 2 o 3 Bauxite ore with a content of about 65% is aluminum raw material, Fe 2 o 3 Iron ore with a content of about 75% is used as iron raw material for high sulfate-resistant Portland cement clinker firing. The main composition of each raw material is shown in Table 1. Take crushed low-alumina stone coal vanadium extraction slag 14.2%, nitrophosphate fertilizer slag 77.3%, bauxite 3.9%, iron ore 4.6%, mix each raw material in proportion, and then grind and homogenize in a ball mill , Grind to a particle size of less than 0.074mm. The obtained raw meal powder is put into a kiln for calcination at 1350-1450°C, and forced air cooling after sintering to obtain sulfate-resistant Portland cement ...

Embodiment 2

[0025] The vanadium extraction slag obtained by using stone coal through fluidized bed furnace decarbonization roasting, rotary kiln oxidation roasting, acid leaching and other processes is used as siliceous raw material, nitrophosphate fertilizer slag is used as calcium raw material, Al 2 o 3 Coal gangue with a content of about 17% is aluminum raw material, Fe 2 o 3 Copper slag with a content of about 47% is ferrous raw material for medium sulfate-resistant Portland cement clinker firing. The main composition of each raw material is shown in Table 4. Take crushed low-alumina stone coal vanadium extraction slag 3.8%, nitrophosphate fertilizer slag 76.8%, coal gangue 14.4%, copper slag 5.0%, mix each raw material in proportion, grind and homogenize in a ball mill, grind To a particle size of less than 0.074mm. The obtained raw meal powder is put into a kiln for calcination at 1350-1450°C, and forced air cooling after sintering to obtain sulfate-resistant Portland cement cli...

Embodiment 3

[0033] The vanadium extraction slag obtained by using stone coal through fluidized bed furnace decarbonization roasting, rotary kiln oxidation roasting, acid leaching and other processes is used as siliceous raw material, nitrophosphate fertilizer slag is used as calcium raw material, Al 2 o 3 Coal ash with a content of about 32% is aluminum raw material, Fe 2 o 3 The sulfuric acid slag with a content of about 53% is ferrous raw material for high sulfate-resistant Portland cement clinker firing. The main composition of each raw material is shown in Table 7. Take 10.5% of vanadium extraction slag from crushed low-alumina stone coal, 77.8% of nitrophosphate fertilizer slag, 6.5% of coal ash, and 5.2% of sulfuric acid slag. To a particle size of less than 0.074mm. The obtained raw meal powder is put into a kiln for calcination at 1350-1450°C, and forced air cooling after sintering to obtain sulfate-resistant Portland cement clinker. The chemical composition and mineral compo...

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Abstract

The invention relates to a method for preparing sulfate / silicate-resistant cement clinker by taking low-aluminum stone coal vanadium-extracting slag and nitric phosphate slag as main raw materials. The method comprises the following steps: performing fluidized bed roaster decarburization roasting, rotary kiln oxidizing roasting, acid leaching and other treatment processes on raw stone coal to obtain low-aluminum stone coal vanadium-extracting slag and nitric phosphate slag, mixing the 3-16 percent by mass of low-aluminum stone coal vanadium-extracting slag, 76-79 percent by mass of nitric phosphate slag, and 7-20 percent by mass of other various aluminum and iron raw materials, grinding into powder of which the particle size is less than 0.074mm, carrying out a clinkering reaction at the temperature of 1350-1450 DEG C, and performing shock cooling to obtain the sulfate / silicate-resistant cement clinker. The sulfate / silicate-resistant cement clinker is prepared by the method in the invention; the raw materials are industrial waste residues, the cost is low, and the environmental load is favorably reduced. Meanwhile, in the method, the adaptability of the aluminum and iron raw materials is wide, the sources are diverse, and various aluminum / iron-containing wastes can be fully utilized.

Description

technical field [0001] The invention relates to the field of preparing Portland cement clinker, in particular to a method for preparing sulfate-resistant Portland cement clinker by using low-alumina stone coal vanadium extraction slag and nitrophosphate fertilizer slag as main raw materials. Background technique [0002] Stone coal is a kind of black carbon-bearing shale, which is not only a kind of inferior anthracite coal, but also a kind of low-grade polymetallic oxide paragenetic ore, containing valuable metal elements such as vanadium, nickel, molybdenum and copper. Extracting vanadium from stone coal has become an important way to obtain vanadium resources. The content of vanadium pentoxide in stone coal in my country is mostly between 0.3-1.0%. Extracting vanadium from stone coal will inevitably produce a large amount of waste slag, and these vanadium extraction slags from stone coal are basically disposed of by stacking, which causes a large environmental load and po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/43
CPCY02P40/10
Inventor 刘琨欧乐明冯其明张国范卢毅屏
Owner CENT SOUTH UNIV
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