Production method of carbide slag cement

Abstract

The invention provides a production method of carbide slag cement, and belongs to the technical field of cement production, and the production method comprises the following steps: taking sandstone, iron ore and slag for burdening, feeding into a roller press for grinding, mixing the obtained discharged material with fly ash, and sorting to obtain an auxiliary material finished product; mixing the carbide slag and the auxiliary material finished product, and homogenizing in a raw material homogenizing silo; sequentially preheating and pre-decomposing the homogenized raw material, feeding into a rotary kiln for calcining to obtain clinker, feeding the clinker into a grate cooler for cooling, and feeding into a clinker warehouse for storage for later use; the clinker, the desulfurized gypsum, the slag and the fly ash are mixed and then fed into a combined grinding system to be ground, and a cement finished product is obtained. The method is used for solving the problems of consumption of a large amount of native natural resources in cement production, treatment of carbide slag and other solid wastes and pollution; according to the method, calcium carbide slag is used for replacing limestone to produce cement, the quality of a cement finished product is stable, the consumption of native resources is remarkably reduced, industrial solid waste is recycled, and the production cost is reduced.

Description

technical field

[0001] The invention relates to the technical field of cement production, in particular to a production method of carbide slag cement. Background technique

[0002] Cement is mainly made of clay, limestone, silica-alumina materials, iron materials and other raw materials mixed and ground in proportion and then calcined at high temperature. It also includes mixed materials, cementitious materials and retarders. It is a powdery hydraulic gelling material that hardens in medium and can harden in water. Therefore, cement is not only widely used in industrial and civil buildings, but also widely used in transportation, urban construction, agriculture, forestry, water conservancy and marine projects, and has a very broad application prospect.

[0003] With the continuous development of the construction industry, the demand for cement is also increasing. At present, the production process of cement needs to consume a large amount of primary iron ore, primary silic...

Examples

Embodiment 1

[0065] A kind of production method of calcium carbide slag cement, comprises the following steps:

[0066] 1) Raw material pretreatment: crush sandstone, slag, and iron ore and send them to the rectangular combined pre-homogenization yard for storage; desulfurized gypsum is crushed by a gypsum crusher and then sent to a round warehouse for storage. Send the fly ash to the garden warehouse for storage.

[0067] Concentrate the calcium carbide slag with a water content of more than 90% in the concentration tank, and reduce the water content to below 80%, then remove excess water through a filter press, press filter to form a filter cake with a water content of ≤38%, and finally send it to the oven After drying in the dry crusher, it is sent to the calcium carbide slag dry powder warehouse for storage.

[0068] Specifically, the chemical composition analysis table of raw materials used in carbide slag cement is as follows: (%)

[0069] L.O.I. SiO 2

Al 2 o ...

Embodiment 2

[0081] A kind of production method of calcium carbide slag cement, raw material and chemical composition thereof are consistent with embodiment 1, during production, differs from embodiment 1 in the following steps:

[0082] Step 2) In the batching and grinding of auxiliary materials, the extrusion pressure of the grinding treatment is 11 MPa, the number of grinding times is 4 times / rotation, the particle size of the feed is not higher than 55mm, and the comprehensive moisture is less than 3.5%. The particle size of the finished product of the above-mentioned auxiliary materials passes through a 0.08mm square hole sieve, and the sieve residue is ≤8%.

[0083] Step 3) In raw meal batching and homogenization, the components and parts by weight in the raw meal are as follows: 80 parts by weight of carbide slag, 15 parts by weight of fly ash, 76 parts by weight of sandstone, 30 parts by weight of slag, and 20 parts by weight of iron ore share.

[0084] Step 4) In firing the clink...

Embodiment 3

[0087] A kind of production method of calcium carbide slag cement, raw material and chemical composition thereof are consistent with embodiment 1, during production, differs from embodiment 1 in the following steps:

[0088] Step 2) In the batching and grinding of auxiliary materials, the extrusion pressure of the grinding treatment is 10 MPa, the grinding frequency is 3 times / rotation, the particle size of the feed is not higher than 55mm, and the comprehensive moisture is less than 3.5%. The particle size of the above-mentioned finished auxiliary materials passes through a 0.08mm square hole sieve, and the sieve residue is ≤5%.

[0089] Step 3) In raw meal batching and homogenization, the components and parts by weight in the raw meal are as follows: 77 parts by weight of carbide slag, 12 parts by weight of fly ash, 75 parts by weight of sandstone, 28 parts by weight of slag, and 19 parts by weight of iron ore share.

[0090] Step 4) In firing the clinker, the temperature o...

technical field

[0001] The invention relates to the technical field of cement production, in particular to a production method of carbide slag cement. Background technique

[0002] Cement is mainly made of clay, limestone, silica-alumina materials, iron materials and other raw materials mixed and ground in proportion and then calcined at high temperature. It also includes mixed materials, cementitious materials and retarders. It is a powdery hydraulic gelling material that hardens in medium and can harden in water. Therefore, cement is not only widely used in industrial and civil buildings, but also widely used in transportation, urban construction, agriculture, forestry, water conservancy and marine projects, and has a very broad application prospect.

[0003] With the continuous development of the construction industry, the demand for cement is also increasing. At present, the production process of cement needs to consume a large amount of primary iron ore, primary silic...

Examples

Embodiment 1

[0065] A kind of production method of calcium carbide slag cement, comprises the following steps:

[0066] 1) Raw material pretreatment: crush sandstone, slag, and iron ore and send them to the rectangular combined pre-homogenization yard for storage; desulfurized gypsum is crushed by a gypsum crusher and then sent to a round warehouse for storage. Send the fly ash to the garden warehouse for storage.

[0067] Concentrate the calcium carbide slag with a water content of more than 90% in the concentration tank, and reduce the water content to below 80%, then remove excess water through a filter press, press filter to form a filter cake with a water content of ≤38%, and finally send it to the oven After drying in the dry crusher, it is sent to the calcium carbide slag dry powder warehouse for storage.

[0068] Specifically, the chemical composition analysis table of raw materials used in carbide slag cement is as follows: (%)

[0069] L.O.I. SiO 2

Al 2 o ...

Embodiment 2

[0081] A kind of production method of calcium carbide slag cement, raw material and chemical composition thereof are consistent with embodiment 1, during production, differs from embodiment 1 in the following steps:

[0082] Step 2) In the batching and grinding of auxiliary materials, the extrusion pressure of the grinding treatment is 11 MPa, the number of grinding times is 4 times / rotation, the particle size of the feed is not higher than 55mm, and the comprehensive moisture is less than 3.5%. The particle size of the finished product of the above-mentioned auxiliary materials passes through a 0.08mm square hole sieve, and the sieve residue is ≤8%.

[0083] Step 3) In raw meal batching and homogenization, the components and parts by weight in the raw meal are as follows: 80 parts by weight of carbide slag, 15 parts by weight of fly ash, 76 parts by weight of sandstone, 30 parts by weight of slag, and 20 parts by weight of iron ore share.

[0084] Step 4) In firing the clink...

Embodiment 3

[0087] A kind of production method of calcium carbide slag cement, raw material and chemical composition thereof are consistent with embodiment 1, during production, differs from embodiment 1 in the following steps:

[0088] Step 2) In the batching and grinding of auxiliary materials, the extrusion pressure of the grinding treatment is 10 MPa, the grinding frequency is 3 times / rotation, the particle size of the feed is not higher than 55mm, and the comprehensive moisture is less than 3.5%. The particle size of the above-mentioned finished auxiliary materials passes through a 0.08mm square hole sieve, and the sieve residue is ≤5%.

[0089] Step 3) In raw meal batching and homogenization, the components and parts by weight in the raw meal are as follows: 77 parts by weight of carbide slag, 12 parts by weight of fly ash, 75 parts by weight of sandstone, 28 parts by weight of slag, and 19 parts by weight of iron ore share.

[0090] Step 4) In firing the clinker, the temperature o...

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