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CN-121974577-A - Method for preparing green silicate cement clinker by utilizing multi-element solid waste cooperation

CN121974577ACN 121974577 ACN121974577 ACN 121974577ACN-121974577-A

Abstract

The method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes comprises the following steps of (1) obtaining raw materials of limestone, silica, phosphorite beneficiation powder, copper tailings, ferroalloy slag and coal-fired slag, and mixing and grinding after silicate batching to prepare raw materials; the green silicate cement clinker is prepared by decomposing the raw materials in a rotary kiln after the raw materials are preheated by a preheater, and has the beneficial effects of improving the combustibility of the raw materials, reducing the raw material cost, reducing the content of f-CaO in the clinker, improving the compressive strength, compactness, water resistance and stability of the clinker, improving the quality of the clinker, reducing the coal consumption for sintering the clinker, reducing the content of water-soluble hexavalent chromium in cement after replacing a part of ferroalloy slag by adopting the copper tailings, and improving the grindability of the raw materials, improving the quality of the clinker, reducing the coal consumption for sintering the clinker and reducing the cost.

Inventors

  • QIN JINPING
  • CHEN SHUMIN
  • ZHANG QINYOU
  • WANG XIAOHUA
  • ZHU GUANGZE
  • PAN PENG
  • LIU WENSI
  • YU PEILIANG

Assignees

  • 湖北京兰水泥集团有限公司

Dates

Publication Date
20260505
Application Date
20251225

Claims (9)

  1. 1. A method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes is characterized by comprising the following steps of (1) obtaining raw materials of limestone, silica, phosphorite beneficiation powder, copper tailings, ferroalloy slag and coal-fired slag, mixing and grinding the raw materials according to silicate ingredients to obtain raw materials, (2) preheating the raw materials by a preheater, decomposing the raw materials in a decomposing furnace, and (3) calcining the raw materials in a rotary kiln after decomposing to obtain the green silicate cement clinker.
  2. 2. The method according to claim 1, wherein in the step (1), the limestone content is 79.77%, the silica content is 7.02%, the phosphate ore dressing powder content is 4.59%, the copper tailings content is 2.54%, the ferroalloy slag content is 0.86%, and the coal-fired slag content is 5.22%.
  3. 3. The method for preparing green silicate cement clinker by utilizing the multi-element solid waste synergistic reaction according to claim 2, wherein the chemical components and the contents of the copper tailings in the raw materials are respectively-3.8% of LOSS, 27.32% of SiO2, 7.97% of Al2O3, 50.70% of Fe2O3, 8.94% of CaO, 3.58% of MgO, 2.62% of SO3, 0.66% of K2O, 0.27% of Na2O and 8.78% of water.
  4. 4. The method for preparing green Portland cement clinker by utilizing the multi-element solid waste synergistic reaction according to claim 2, wherein the chemical components and contents of the coal-fired furnace slag in raw materials are respectively 3.64% of LOSS, 50.06% of SiO 2 , 29.91% of Al 2 O 3 , 6.96% of Fe 2 O 3 , 6.43% of CaO, 1.63% of MgO, 0.52% of SO 3 , 1.11% of K 2 O, 0.58% of Na 2 O and 14.98% of water.
  5. 5. The method for preparing green silicate cement clinker by utilizing multi-element solid waste according to claim 2, wherein the chemical components and contents of the phosphorite beneficiation powder in raw materials are 38.34%, 4.78% of SiO2, 1.63% of Al2O3, 2.00% of Fe2O3, 29.84% of CaO, 18.28% of MgO, 1.75% of SO3, 0.28% of K2O, 0.22% of Na2O and 11.12% of water respectively.
  6. 6. The method according to claim 1, wherein in the step (1), the limestone content is 81.11%, the shale content is 1.57%, the silica content is 4.24%, the phosphate ore dressing powder content is 4.44%, the copper tailings content is 2.26%, the ferroalloy slag content is 1.13%, and the coal-fired slag content is 5.25%.
  7. 7. The method for preparing green silicate cement clinker by utilizing the multi-element solid waste synergistic reaction according to claim 6, wherein the chemical components and the contents of the copper tailings in the raw materials are respectively-4.38% of LOSS, 35.1% of SiO2, 5.62% of Al2O3, 52.70% of Fe2O3, 3.23% of CaO, 3.77% of MgO, 2.20% of SO3, 0.70% of K2O, 0.17% of Na2O and 9.78% of water.
  8. 8. The method for preparing green Portland cement clinker by utilizing the multi-element solid waste synergistic reaction according to claim 6, wherein the chemical components and the contents of the coal-fired furnace slag in raw materials are respectively 3.30% of LOSS, 48.50% of SiO 2 , 27.12% of Al 2 O 3 , 7.61% of Fe 2 O 3 , 6.23% of CaO, 1.31% of MgO, 0.66% of SO 3 , 1.26% of K 2 O, 0.81% of Na 2 O and 14.26% of water.
  9. 9. The method for preparing green Portland cement clinker by utilizing the multi-element solid waste synergistic reaction according to claim 6, wherein the chemical components and the contents of the phosphorite beneficiation powder in raw materials are respectively 1.38% of LOSS, 48.50% of SiO2, 9.58% of Al2O3, 13.41% of Fe2O3, 45.26% of CaO, 6.40% of MgO, 2.45% of SO3, 0.83% of K2O, 0.34% of Na2O and 5.61% of water.

Description

Method for preparing green silicate cement clinker by utilizing multi-element solid waste cooperation Technical Field The invention relates to the technical field of cement clinker, in particular to a method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes. Background The limit and determination method of water-soluble hexavalent chromium (VI) in cement (GB 31893-2015) prescribes that the water-soluble hexavalent chromium content in cement is not more than 10.00mg/kg. The water-soluble hexavalent chromium (Cr (VI)) is an element with high toxicity in cement heavy metals, and can cause harm to human bodies through skin contact, respiratory tract inhalation, environment contact and other ways, so that along with the increasing importance of people on environmental and health problems, the hexavalent chromium problem in cement is also attracting more attention. The main sources of chromium in cement clinker are (1) raw and combustion materials such as limestone, sandstone, clay, iron correction materials, coal and the like often contain a certain amount of chromium. (2) Crushing and grinding systems, such as various crushers of raw materials, grinding bodies of grinding systems, etc., all contain a certain amount of chromium. (3) Kiln systems, such as castable, pendants, refractory bricks, etc., all contain a certain amount of chromium. The existing methods for reducing the content of water-soluble hexavalent chromium in cement by using chemical additives mainly comprise a reducing agent method, a chemical curing method, a water reducing agent inhibition method and the like, but the methods have the defects of increased cost, poor stability, poor operation and the like. Iron alloy slag is mainly used as an iron correction material by traditional cement production enterprises for many years, and the iron correction material has the following defects that firstly, the content of chromium is high, so that water-soluble hexavalent chromium (Cr (VI)) in cement is difficult to control, secondly, the grindability of the material is poor, so that the abrasion of a raw material vertical mill roller (a roller press) is large, the surfacing cost is increased, the power consumption of a raw material grinding process is high, and thirdly, the content of water-soluble hexavalent chromium (Cr (VI)) is high, so that the stability of cement clinker is influenced. Therefore, the existing cement clinker production technology also has the problems of higher power consumption in the raw material process, high raw material cost, higher content of water-soluble hexavalent chromium (Cr (VI)), poor clinker stability and the like. Disclosure of Invention The invention aims to solve the technical problems of higher power consumption in a raw material procedure, high raw material cost, higher content of water-soluble hexavalent chromium (Cr (VI)), poor clinker stability and the like in a cement clinker production technology by providing a method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes. The invention provides a method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes, which comprises the following steps of (1) obtaining raw materials of limestone, silica, phosphorite beneficiation powder, copper tailings, ferroalloy slag and coal-fired slag, mixing and grinding the raw materials according to silicate ingredients to prepare raw materials, (2) preheating the raw materials by a preheater, decomposing the raw materials in a decomposing furnace, and (3) calcining the raw materials in a rotary kiln to prepare the green silicate cement clinker. The invention provides a method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes, which comprises the following steps of (1) preparing raw materials required by the cement clinker, wherein the content of limestone is 79.77%, the content of silica is 7.02%, the content of phosphorite beneficiation powder is 4.59%, the content of copper tailings is 2.54%, the content of ferroalloy slag is 0.86%, and the content of coal-fired slag is 5.22%. The invention provides a method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes, which comprises the following chemical components and contents of LOSS content of-3.8%, siO2 content of 27.32%, al2O3 content of 7.97%, fe2O3 content of 50.70%, caO content of 8.94%, mgO content of 3.58%, SO3 content of 2.62%, K2O content of 0.66%, na2O content of 0.27% and water content of 8.78%. The invention provides a method for preparing green silicate cement clinker by utilizing the cooperation of multiple solid wastes, which comprises the following chemical components and contents of 3.64% of LOSS, 50.06% of SiO2, 29.91% of Al2O3, 6.96% of Fe2O3, 6.43% of CaO, 1.63% of MgO, 0.52% of SO3, 1.11% of K2O, 0.58% of Na2O and 14.98% of water i