Production method and product of cement retarder from ardealite

A technology of cement retarder and production method, which is applied in the field of cement retarder made from phosphogypsum, can solve problems such as inability to popularize in a large area, complex production process, secondary pollution, etc., and achieve low product cost, simple method, good retardation coagulation effect

Inactive Publication Date: 2012-07-04
云南新龙矿物质饲料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The whole process needs to be calcined because phosphogypsum needs to be calcined, which consumes a lot of coal, generally 50-80kg of coal per ton of product; at the same time, the tail gas of calcined needs to be processed, which causes secondary pollution; the production process is complicated and the cost is high, and the manufacturing cost exceeds 80 yuan / tons, resulting in the selling price exceeding the price of desulfurized gypsum used in cement plants, making it impossible to promote it on a large scale

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  • Production method and product of cement retarder from ardealite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A, measure the mass percentage content of fluorine (F) in phosphogypsum by fluoride ion selective electrode method to be 0.1%; Measure free phosphoric acid (in P in phosphogypsum by quinoline phosphomolybdic acid gravimetric method) 2 o 5 Calculated) the mass percentage content is: 0.41%. Determination of attached water in phosphogypsum by gravimetric method (H 2 O) The mass percentage content is: 26.4%.

[0026] According to 100 tons of phosphogypsum, the amount of fluoride ions is 0.1 tons, and the amount of CaO required for theoretical neutralization is 0.295 tons. The calculation formula is:

[0027] 100×0.1%×56 / 38 = 0.15.

[0028] Based on 100 tons of phosphogypsum, free phosphoric acid (in P 2 o 5 Calculated) is 0.41 tons, the amount of CaO required for neutralization in theory is 0.49 tons, the calculation formula is:

[0029] 100×0.41%×168 / 142 = 0.49.

[0030] B. Add 100 tons of phosphogypsum to the mixer, then add 5 tons of quicklime powder with a finene...

Embodiment 2

[0037] A, measure the mass percent content of fluorine (F) in phosphogypsum by the fluoride ion selective electrode method and be 0.15%; Measure free phosphoric acid (in P in phosphogypsum by the quinoline phosphomolybdic acid gravimetric method) 2 o 5 Calculated) the mass percentage content is: 0.62%. Determination of attached water in phosphogypsum by gravimetric method (H 2 O) The mass percentage content is: 27.25%.

[0038] Based on 100 tons of phosphogypsum, the amount of fluoride ions is 0.15 tons, and the amount of CaO required for theoretical neutralization is 0.22 tons. According to 100 tons of phosphogypsum, free phosphoric acid (in P 2 o 5 Calculated) is 0.41 tons, and the amount of CaO required for neutralization in theory is 0.73 tons.

[0039] B. Add 100 tons of phosphogypsum to the mixer, then add 6 tons of quicklime powder with a fineness of 100 mesh, 15 tons of cement kiln dust, and 6 tons of grinding aids. The grinding aids are: triisopropanolamine 50 %,...

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Abstract

The invention relates to a novel cement retarder prepared from ardealite and a production method thereof. The production method comprises the following steps of: 1, analyzing the mass percentage content of fluorine and free phosphoric acid in the ardealite; 2, adding the weighed ardealite in a mixer, adding quick lime powder the weight of which is 3-8 times that of the ardealite, adding cement kiln ash the weight of which is 5-15% of the ardealite, and adding a grinding aid the weight of which is 5-10% of the ardealite; 3, controlling the mixing time of materials in the mixer to 10-30 minutes to obtain a mixed material; 4, feeding the mixed material into a smashing machine with a belt transportation machine for smashing the mixed material, and uniformly distributing the material layer by layer in a storeroom; 5, standing and curing the distributed material for 3-10 days in the storeroom to obtain the modified ardealite; and 6, continuously turning over the modified ardealite through a double-beam grab bucket crane and further naturally drying so as to obtain the cement retarder prepared from the ardealite. The obtained product is powdery and contains more than or equal to 38% of SO3, less than or equal to 0.1% of free phosphoric acid (based on P2O5), more than or equal to 15% of crystal water and less than or equal to 18% of adhered water.

Description

technical field [0001] The invention relates to a novel phosphogypsum cement retarder and a production method. Background technique [0002] Since phosphogypsum contains impurities harmful to cement such as fluoride ions and free phosphoric acid, it cannot be directly used as a cement retarder and needs to be modified. At the same time, phosphogypsum is in powder form with a water content of 25-30%. Direct use in cement plants will cause silo blockage, which is difficult to control. The general method of producing phosphogypsum retarder is to firstly add modifier lime powder to phosphogypsum to neutralize and modify the fluoride ion and free phosphoric acid in phosphogypsum. A part (~30%) of the modified phosphogypsum is calcined to remove the attached water. At the same time, the main component of the phosphogypsum is calcium sulfate dihydrate (CaSO 4 2H 2 O) is also taken off 1.5 of its crystal water and becomes calcium sulfate hemihydrate (CaSO 4 0.5H 2 o). The calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B103/22
Inventor 邓跃进任力生罗蜀峰吴昌全
Owner 云南新龙矿物质饲料有限公司
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