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A method for reducing volatilization of heavy metal lead in cement clinker firing

A technology of cement clinker and heavy metals, which is applied in the field of building materials, can solve the problems of environmental threats, toxic heavy metal lead, etc., and achieve the effects of low cost, low volatilization rate, and easy large-scale promotion and production application

Active Publication Date: 2020-06-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, solid waste generally contains the highly toxic and volatile heavy metal lead. In the high temperature environment of the cement kiln, the heavy metal lead will be discharged out of the cement kiln along with the flue gas, posing a great threat to the surrounding environment.

Method used

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  • A method for reducing volatilization of heavy metal lead in cement clinker firing
  • A method for reducing volatilization of heavy metal lead in cement clinker firing
  • A method for reducing volatilization of heavy metal lead in cement clinker firing

Examples

Experimental program
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Effect test

Embodiment 1

[0040](1) Preparation of cement raw meal: control rate value lime saturation coefficient KH=0.9, silicon rate SM=2.5 and aluminum rate IM=1.6, calculate the proportioning of limestone, clay, iron ore and solid waste according to Bouger's formula, That is, 70.4 parts by weight of limestone, 14.3 parts by weight of clay, 0.3 parts by weight of iron ore, and 15 parts by weight of solid waste. The cement raw materials are crushed with large particles by a jaw crusher, dried at 105°C for 24 hours, and then pulverized with a ball mill until they pass through a 180-mesh sieve, and the sieve residue is less than 2.5%. Then put the sieved cement raw materials into a closed three-dimensional mixer and mix them for 4 hours to make them fully mixed.

[0041] (2) Addition of sulfur-containing compounds: the sulfur-containing compounds were replaced with CaSO 4 2H 2 Add cement raw meal in the form of O, grind it in an agate mortar until it passes through a 180 mesh sieve before adding, an...

Embodiment 2

[0047] (1) Preparation of cement raw meal: control rate value lime saturation coefficient KH=0.9, silicon rate SM=2.5 and aluminum rate IM=1.6, calculate the proportioning of limestone, clay, iron ore and solid waste according to Bouger's formula , that is, 70.4 parts by weight of limestone, 14.3 parts by weight of clay, 0.3 parts by weight of iron ore, and 15 parts by weight of solid waste. The cement raw materials are crushed with large particles by a jaw crusher, dried at 105°C for 24 hours, and then pulverized with a ball mill until they pass through a 180-mesh sieve, and the sieve residue is less than 2.5%. Put it into a closed three-dimensional mixer and mix it for 4 hours to make it fully mixed.

[0048] (2) Addition of sulfur-containing compounds: Add sulfur-containing compounds to cement raw materials in the form of CaS, grind them in an agate mortar to pass 180 mesh sieves before adding, and then use 0% of the mass of cement raw materials (as reference Ratio), 0.5%,...

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Abstract

The invention belongs to the technical field of building materials and discloses a method to reduce volatilization of heavy metal lead in cement clinker sintering. The method comprises the steps of preparing raw cement, adding sulfur-bearing compounds into the raw cement, mixing well, preforming sheeting, and calcining to obtain cement clinker. The sulfur-bearing compounds, such as CaSO4 2H2O, which are industrial production byproducts, are utilized herein; volatilization rate of Pb in cement clinker sintering can be effectively reduced at the premise of not affecting the quality of cement clinker sintering. The materials used in the implementation of the method herein are low in cost; the existing cement production environment is not changed; the method is easy to popularize and apply toproduction on large scale.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for reducing volatilization of heavy metal lead in cement clinker firing. Background technique [0002] my country's cement output has ranked first in the world for 26 consecutive years. The production of cement consumes a large amount of natural resources such as coal and limestone, which is very unfavorable to the sustainable development of our country. At the same time, with the development of cities and industries in our country, a large amount of urban and industrial solid wastes are produced. According to statistics, in 2016, my country discharged more than 300 million tons of municipal solid waste and 3.3 billion tons of industrial solid waste. While these solid wastes have a great negative impact on our environment, they also contain a lot of available resources. Using solid waste as an alternative raw material and fuel in the production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/42C04B7/44
CPCC04B7/425C04B7/44
Inventor 韦江雄张宾曾正祥石亮张同生余其俊
Owner SOUTH CHINA UNIV OF TECH