Low-heat cement capable of efficiently utilizing industrial waste gypsum

Abstract

The invention discloses low-heat cement capable of efficiently utilizing industrial waste gypsum. The cement is prepared through the steps of preparing cement raw materials from limestone, bauxite, clay, pyrite cinder, fluorite, barium dregs and the processed industrial waste gypsum according to a certain mass ratio, evenly mixing the materials, grinding the materials into raw material powder, sintering the raw material powder, and adding industrial waste gypsum and an adjusting agent to sintered cement clinker. The utilization rate of the industrial waste gypsum in cement production is greatly increased; in the product formed through a formula, the C3S content is decreased, the C2S content is increased, and therefore hydration heat is low; meanwhile, by introducing early-strengthen type sulphoaluminate minerals and adding appropriate amounts of the industrial waste gypsum and the adjusting agent, hydration is promoted, high early strength is achieved, the defect that ordinary low-heat cement is low in early strength is overcome, and the application range of the low-heat cement is widened.

Description

technical field

[0001] The invention belongs to the technical field of cement materials, in particular to a low-heat cement capable of efficiently utilizing industrial waste gypsum. Background technique

[0002] With the continuous development of my country's industry, the consumption of natural gypsum and other resources continues to rise. Due to the limited reserves of natural gypsum, its storage capacity is getting smaller and smaller, and its price is also increasing year by year. Industrial waste gypsum is the industrial waste residue in the process of industrial production. There are many types. The waste residue produced by using phosphate ore and sulfuric acid to produce phosphoric acid is phosphogypsum; the flue gas generated after the combustion of sulfur-containing fuels (coal, oil, etc.) is desulfurized and purified. The industrial by-product gypsum obtained after treatment is desulfurized gypsum; the citric acid produced by industrial microbial fermentation main...

Examples

Embodiment 1

[0018] A low-heat cement capable of efficiently utilizing industrial waste gypsum, the preparation method of which is as follows:

[0019] 1. Preparation of cement raw meal:

[0020] Dosing according to the following mass parts: 55 parts of limestone, 0.5 part of bauxite, 5 parts of clay, 0.5 part of sulfuric acid slag, 0.2 part of fluorite, 3 parts of barium slag, 8 parts of processed industrial waste gypsum, and various The components are uniformly mixed and ground to 150-200 mesh to obtain cement raw meal. The treatment method of the treated industrial waste gypsum is as follows: drying at a high temperature of 350° C. for 30 minutes.

[0021] 2. Preparation of cement clinker

[0022] The mixed cement raw meal is placed in a rotary kiln for calcination, the calcination temperature is 1330°C, and the calcination time is 100min to obtain cement clinker;

[0023] 3. Preparation of cement

[0024] Take 70 parts of burnt cement clinker, add 20 parts of industrial waste gypsu...

Embodiment 2

[0026] A low-heat cement capable of efficiently utilizing industrial waste gypsum, the preparation method of which is as follows:

[0027] 1. Preparation of cement raw meal:

[0028] Dosing according to the following mass parts: 75 parts of limestone, 3 parts of bauxite, 15 parts of clay, 1.5 parts of sulfuric acid slag, 0.6 part of fluorite, 8 parts of barium slag, 10 parts of processed industrial waste gypsum, various The components are uniformly mixed and ground to 150-200 mesh to obtain cement raw meal. The treatment method of the treated industrial waste gypsum is: drying at a high temperature of 350° C. for 40 minutes.

[0029] 2. Preparation of cement clinker

[0030] Put the mixed cement raw meal in a rotary kiln for calcination, the calcination temperature is 1350°C, and the calcination time is 90min to obtain cement clinker;

[0031] 3. Preparation of cement

[0032] Take 80 parts of burnt cement clinker, add 15 parts of industrial waste gypsum and 0.5 part of re...

Embodiment 3

[0034] A low-heat cement capable of efficiently utilizing industrial waste gypsum, the preparation method of which is as follows:

[0035] 1. Preparation of cement raw meal:

[0036] Dosing according to the following mass parts: 90 parts of limestone, 4.5 parts of bauxite, 15 parts of clay, 1.5 parts of sulfuric acid slag, 0.6 part of fluorite, 8 parts of barium slag, 10 parts of processed industrial waste gypsum, and various The components are uniformly mixed and ground to 150-200 mesh to obtain cement raw meal. The treatment method of the treated industrial waste gypsum is: drying at a high temperature of 350° C. for 45 minutes.

[0037] 2. Preparation of cement clinker

[0038] Put the mixed cement raw meal in a rotary kiln for calcination, the calcination temperature is 1350°C, and the calcination time is 90min to obtain cement clinker;

[0039] 3. Preparation of cement

[0040] Take 85 parts of burnt cement clinker, add 20 parts of industrial waste gypsum and 0.6 part o...

technical field

[0001] The invention belongs to the technical field of cement materials, in particular to a low-heat cement capable of efficiently utilizing industrial waste gypsum. Background technique

[0002] With the continuous development of my country's industry, the consumption of natural gypsum and other resources continues to rise. Due to the limited reserves of natural gypsum, its storage capacity is getting smaller and smaller, and its price is also increasing year by year. Industrial waste gypsum is the industrial waste residue in the process of industrial production. There are many types. The waste residue produced by using phosphate ore and sulfuric acid to produce phosphoric acid is phosphogypsum; the flue gas generated after the combustion of sulfur-containing fuels (coal, oil, etc.) is desulfurized and purified. The industrial by-product gypsum obtained after treatment is desulfurized gypsum; the citric acid produced by industrial microbial fermentation main...

Examples

Embodiment 1

[0018] A low-heat cement capable of efficiently utilizing industrial waste gypsum, the preparation method of which is as follows:

[0019] 1. Preparation of cement raw meal:

[0020] Dosing according to the following mass parts: 55 parts of limestone, 0.5 part of bauxite, 5 parts of clay, 0.5 part of sulfuric acid slag, 0.2 part of fluorite, 3 parts of barium slag, 8 parts of processed industrial waste gypsum, and various The components are uniformly mixed and ground to 150-200 mesh to obtain cement raw meal. The treatment method of the treated industrial waste gypsum is as follows: drying at a high temperature of 350° C. for 30 minutes.

[0021] 2. Preparation of cement clinker

[0022] The mixed cement raw meal is placed in a rotary kiln for calcination, the calcination temperature is 1330°C, and the calcination time is 100min to obtain cement clinker;

[0023] 3. Preparation of cement

[0024] Take 70 parts of burnt cement clinker, add 20 parts of industrial waste gypsu...

Embodiment 2

[0026] A low-heat cement capable of efficiently utilizing industrial waste gypsum, the preparation method of which is as follows:

[0027] 1. Preparation of cement raw meal:

[0028] Dosing according to the following mass parts: 75 parts of limestone, 3 parts of bauxite, 15 parts of clay, 1.5 parts of sulfuric acid slag, 0.6 part of fluorite, 8 parts of barium slag, 10 parts of processed industrial waste gypsum, various The components are uniformly mixed and ground to 150-200 mesh to obtain cement raw meal. The treatment method of the treated industrial waste gypsum is: drying at a high temperature of 350° C. for 40 minutes.

[0029] 2. Preparation of cement clinker

[0030] Put the mixed cement raw meal in a rotary kiln for calcination, the calcination temperature is 1350°C, and the calcination time is 90min to obtain cement clinker;

[0031] 3. Preparation of cement

[0032] Take 80 parts of burnt cement clinker, add 15 parts of industrial waste gypsum and 0.5 part of re...

Embodiment 3

[0034] A low-heat cement capable of efficiently utilizing industrial waste gypsum, the preparation method of which is as follows:

[0035] 1. Preparation of cement raw meal:

[0036] Dosing according to the following mass parts: 90 parts of limestone, 4.5 parts of bauxite, 15 parts of clay, 1.5 parts of sulfuric acid slag, 0.6 part of fluorite, 8 parts of barium slag, 10 parts of processed industrial waste gypsum, and various The components are uniformly mixed and ground to 150-200 mesh to obtain cement raw meal. The treatment method of the treated industrial waste gypsum is: drying at a high temperature of 350° C. for 45 minutes.

[0037] 2. Preparation of cement clinker

[0038] Put the mixed cement raw meal in a rotary kiln for calcination, the calcination temperature is 1350°C, and the calcination time is 90min to obtain cement clinker;

[0039] 3. Preparation of cement

[0040] Take 85 parts of burnt cement clinker, add 20 parts of industrial waste gypsum and 0.6 part o...

Images