Biochemical preparation method of steel slag powder, cement mixed material and concrete admixture

A steel slag powder and biochemical technology, which is applied in the field of concrete admixture, steel slag powder biochemical preparation, and cement mixing materials, can solve the problems of unfavorable steel slag reuse, waste of resources, poor wearability of steel slag, etc., and achieve easy grinding Improve performance, reduce waste of resources, and reduce energy consumption of powder grinding

Pending Publication Date: 2021-10-12
BUILDERA CONSTR TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since steel slag includes iron and iron oxides, the iron content is relatively high, and the main form of iron oxides is olivine (2FeO SiO 2 ), resulting in poor grindability of steel slag and high power consumption for grinding, which is not conducive to the reuse of steel slag in the cement concrete industry, so a large amount of steel slag discharge has caused serious waste of resources and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a biochemical preparation method of steel slag powder, which sequentially includes S1 biochemical treatment and S2 drying and grinding. Among them, the specific operation of S1 biochemical treatment is: soak steel slag in the aqueous solution with iron-oxidizing bacteria, so that the iron element and Fe in the steel slag 2+ converted to Fe 3+ , to Fe in aqueous solution 2+ The concentration decreases and remains stable, forming solid phase product and reaction solution, the total reaction formula is: 4Fe+6H 2 O+3O 2 →2Fe(OH) 3 , 4FeO+6H 2 O+O 2 →4Fe(OH) 3 ; S2 drying and grinding includes S21 drying treatment and S22 grinding treatment. S21 drying treatment and S22 grinding treatment can be carried out in two steps according to any order, or can be carried out at the same time. The specific operation of S21 drying treatment is: the solid phase product is taken out from the reaction solution and dried; the specific operation of S22 grindin...

Embodiment 2

[0044] S1 Biochemical treatment: The steel slag used in this example is the solid waste steel slag formed in Jinan Iron and Steel Plant, with an alkalinity of 3.2 mmol / L. The above steel slag was soaked in a concentration of 10 6 In the aqueous solution of CFU / ml polyspore spring hair bacteria, the concentration of steel slag in the iron-oxidizing bacteria aqueous solution is 0.8g / ml, after soaking for 5 days, to the aqueous solution Fe 2+ The concentration is reduced to a minimum and maintains a stable formation of solid phase products and reaction solutions.

[0045] S21 drying treatment: take out the solid product from the reaction solution, put it into a dryer for drying, and set the drying temperature to 600° C. to form a solid product.

[0046] S22 Grinding treatment: achieve vertical mill grinding for solid products, maintain the temperature of hot air in the vertical mill at 600-800°C, and grind until the specific surface area of ​​the powder is 500-600m 2 / kg, formi...

Embodiment 3

[0052] S1 Biochemical treatment: The steel slag used in this example is the solid waste steel slag formed by Ma'anshan Iron and Steel Plant, with an alkalinity of 3.4 mmol / L. Soak the above steel slag in a concentration of 5×10 7 CFU / ml of the aqueous solution of polysporus spring hair bacteria, the concentration of steel slag in the iron-oxidizing bacteria aqueous solution is 0.7g / ml, after soaking for 4 days, a solid phase product and a reaction solution are formed.

[0053] S21 drying treatment: take out the solid product from the reaction solution, put it into a dryer for drying, and set the drying temperature to 800° C. to form a solid product.

[0054] S22 Grinding treatment: achieve vertical mill grinding for solid products, maintain the temperature of hot air in the vertical mill at 600-800°C, and grind until the specific surface area of ​​the powder is 500-600m 2 / kg, forming the final product steel slag powder of this implementation.

[0055] According to calculati...

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Abstract

The invention relates to a biochemical preparation method of steel slag powder, a cement mixed material and a concrete admixture, and the biochemical preparation method comprises the following steps: S1, biochemical treatment: soaking steel slag in an aqueous solution of iron-oxidizing bacteria to convert elemental iron and Fe < 2 + > in the steel slag into Fe < 3 + > until the concentration of Fe < 2 + > in the aqueous solution is reduced and is kept stable to form a reaction solution; and S2, drying and grinding: taking out a solid-phase product from the reaction solution, drying and grinding to form steel slag powder. The prepared steel slag powder is applied as the cement mixed material or concrete admixture. The steel slag is subjected to early-stage biochemical treatment, so that the particle compact structure of the steel slag becomes loose, and the grindability is greatly improved. The powder abrasion energy of the treated steel slag is reduced in the grinding process, the grinding efficiency of the steel slag is improved, the reutilization rate of the steel slag is further improved, and resource waste and environmental pressure caused by discharge of a large amount of steel slag are reduced.

Description

technical field [0001] The invention relates to the technical field of industrial solid waste steel slag treatment, in particular to a biochemical preparation method of steel slag powder, a cement mixing material and a concrete admixture. Background technique [0002] With the further strengthening of environmental protection requirements, the comprehensive utilization of various industrial wastes has received extensive attention. In recent years, slag has been widely used in the cement concrete industry and has become a scarce resource, but the comprehensive utilization rate of industrial solid waste steel slag equivalent to the discharge of slag is only about 10%. [0003] Since steel slag contains dicalcium silicate (2CaO·SiO 2 ), tricalcium silicate (3CaO SiO 2 ), tricalcium ferrite (2CaO Fe 2 o 3 ) and other mineral components similar to cement clinker have certain hydration activity, so grinding steel slag as cement mixing material and concrete admixture has always...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/06C04B7/147C04B7/38C12P3/00C12R1/01
CPCC04B5/06C04B7/147C04B7/38C12P3/00Y02P40/10
Inventor 蒋旭峰
Owner BUILDERA CONSTR TECH SHANGHAI CO LTD
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