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Preparation method of phosphogypsum slag-based cement

A phosphogypsum and slag technology, applied in the field of preparation of phosphogypsum slag-based cement, can solve the problems of long setting time, low early strength, easy carbonization, etc., and achieve the effects of short setting time, increased compressive strength and low cost

Pending Publication Date: 2020-12-22
四川绵筑新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Low early strength, 2. Long setting time, 3. Easy to carbonize

Method used

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  • Preparation method of phosphogypsum slag-based cement

Examples

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Embodiment

[0028] Example: see figure 1 , a preparation method of phosphogypsum slag-based cement, the method steps are as follows,

[0029] Step 1, use lime to carry out neutralization reaction treatment on phosphogypsum, mix phosphogypsum with a certain proportion of lime evenly, make it fully neutralize, remove impurities soluble phosphorus and soluble fluorine, the lime is quicklime or slaked lime, its The mixing ratio is 3%-5% of the mass of phosphogypsum;

[0030] Step 2. Place the prepared phosphogypsum in a blast drying oven, dry it to constant weight at 105°C to remove free water, and then grind it in a horizontal ball mill until the specific surface area is 400m 2 / kg or so;

[0031] By modifying the phosphogypsum through the above steps, the quality of the phosphogypsum is improved, and the adverse effects of impurities in the phosphogypsum on the performance of the phosphogypsum slag-based cement are reduced.

[0032] Step 3, combining the prepared phosphogypsum with ultra...

example 1

[0042] Example 1: the unslaked lime that mixes 4% of phosphogypsum quality carries out neutralization reaction treatment to phosphogypsum and makes pretreated phosphogypsum, and its raw material components are calculated by mass percentage:

[0043] Phosphogypsum after pretreatment: 15%;

[0044] The specific surface area is 800m 2 / kg superfine blast furnace slag: 80%;

[0045] The specific surface area is 350m 2 42.5 Portland cement clinker / kg: 4%;

[0046] Aluminate cement: 1%;

[0047] The above-mentioned raw materials are taken and thoroughly mixed uniformly to prepare phosphogypsum slag-based cement. The water-to-cement ratio is 0.4. After testing, the phosphogypsum slag-based cement prepared by the present invention has a 3d compressive strength of 20.1MPa, a 28d compressive strength of 58.6MPa, and a 90d compressive strength of 64.8MPa. The initial setting time is 102min, and the final setting The time is 260min.

example 2

[0048] Example 2: the quick lime mixed with 4% of the phosphogypsum quality is carried out to the phosphogypsum after the neutralization reaction treatment to make the pretreated phosphogypsum, and its raw material components are calculated by mass percentage:

[0049] Phosphogypsum after pretreatment: 15%;

[0050] The specific surface area is 1000m 2 / kg superfine blast furnace slag: 80%;

[0051] The specific surface area is 400m 2 42.5 Portland cement clinker / kg: 4%;

[0052] Aluminate cement: 1%;

[0053] The above-mentioned raw materials are taken and thoroughly mixed uniformly to prepare phosphogypsum slag-based cement. Using water-binder ratio of 0.4, after testing, the phosphogypsum slag-based cement prepared by the present invention has a 3d compressive strength of 25.3MPa, a 28d compressive strength of 62.6MPa, a 90d compressive strength of 70.5MPa, an initial setting time of 90min, and a final setting The time is 240min.

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Abstract

The invention discloses a preparation method of phosphogypsum slag-based cement. The method comprises the following steps: 1, carrying out neutralization reaction treatment on phosphogypsum by using lime; step 2, drying, dehydrating and grinding the prepared phosphogypsum; and 3, uniformly mixing the prepared phosphogypsum with ultrafine blast furnace slag, a Portland cement clinker and a coagulant according to a mass ratio of (15-20%):(75-85%):(1-5%):(1-2%) to obtain the phosphogypsum slag-based cement material. Compared with the prior art, the method has the advantages of turning waste intowealth, being economical and environmentally friendly and the like, and is simple in preparation process, easy to operate and low in cost. The prepared phosphogypsum slag-based cement is high in compressive strength, short in setting time, low in cost, energy-saving and environment-friendly, and has a wide application prospect.

Description

technical field [0001] The invention relates to the preparation of cement materials, in particular to a preparation method of phosphogypsum slag-based cement. Background technique [0002] Phosphogypsum is a solid waste residue from the wet process of phosphoric acid production. For every ton of phosphoric acid produced, 4 to 5 tons of phosphogypsum by-products are produced. At present, the annual discharge of phosphogypsum in the world is about 300 million tons, but the comprehensive utilization rate of phosphogypsum is only 10%. The annual discharge of phosphogypsum in my country is about 70 million tons, and the discharge of phosphogypsum accounts for 70% of the annual discharge of gypsum, an industrial by-product in my country. Due to the low utilization rate of phosphogypsum, the total amount of phosphogypsum stockpiled in my country is about 500 million tons. How to greatly improve the utilization rate of phosphogypsum is an important technical problem to be solved ...

Claims

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Application Information

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IPC IPC(8): C04B7/19C04B7/21C04B7/38
CPCC04B7/19C04B7/21C04B7/38Y02P40/10
Inventor 韩方晖廖延武
Owner 四川绵筑新材料有限公司
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