Semi-hydrated phosphogypsum filling material and preparation method thereof
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A technology of hemihydrate phosphogypsum and filling material, applied in the field of mine filling material, can solve the problems of slow setting time, low early strength, low utilization rate of phosphogypsum, etc., so as to improve fluidity, stimulate gelling performance, and reduce stockpiling. effect of stress
Inactive Publication Date: 2018-01-09
GUIZHOU CHANHEN CHEM CO LTD
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Therefore, the above method has low utilization rate of phosphogypsum, slow setting time and low early strength
[0006] Hemihydrate phosphogypsum is a by-product of the hemihydrate phosphoric acid process, the main component is CaSO 4 1 / 2H 2 O, because it only contains half of crystal water, has potential gelling activity, but is affected by impurities such as phosphorus and fluorine and crystal form, it is not as gelling as building gypsum powder, and needs to be modified to form strength
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[0024] The present invention also provides a preparation method of the above-mentioned phosphogypsum hemihydrate filling material, comprising the following steps:
[0025] After the hemihydrate phosphogypsum is dried, it is weighed with quicklime, dihydrate phosphogypsum, coagulation accelerator or retarder according to the proportion, mixed evenly, and water is added to prepare hemihydrate phosphogypsum filling slurry.
[0026] Preferably, in the preparation method of the above-mentioned hemihydrate phosphogypsum-based paste filling material, the solid content of the hemihydrate phosphogypsum filling slurry is 65-80%, and the slump of the slurry is 20-25cm.
[0027] In the present invention, the industrial by-product hemihydrate phosphogypsum after drying and dehydration is used as the cementitious material, which is convenient for storage and transportation of the cementitious material, and quicklime is added as a pH regulator to solidify acidic impurities such as P and F in ...
Embodiment 1
[0030] Embodiment 1 prepares hemihydrate phosphogypsum filling material of the present invention
[0031] Add 49 parts of hemihydrate phosphogypsum with a crystal water content of 6%, 50 parts of dihydrate phosphogypsum, 1 part of quicklime, 0.001 part of retarder (sodium citrate), and add water to prepare a slurry with a solid content of 75%. , that is.
Embodiment 2
[0032] Embodiment 2 prepares hemihydrate phosphogypsum filling material of the present invention
[0033] Prepare 80 parts of hemihydrate phosphogypsum with a crystal water content of 6%, 30 parts of dihydrate phosphogypsum, 5 parts of quicklime, 0.003 part of retarder (sodium succinate), and add water to prepare a slurry with a solid content of 75%. , that is.
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Abstract
The invention belongs to the field of mine filling materials and in particular relates to a semi-hydrated phosphogypsum filling material and a preparation method thereof. The filling material preparedfrom semi-hydrated phosphogypsum is high in strength, excellent in fluidity and low in bleeding rate. The invention provides the semi-hydrated phosphogypsum filling material and the preparation method thereof. The filling material comprises the following components in parts by weight: 49-80 parts of semi-hydrated phosphogypsum, 30-50 parts of dehydrate phosphogypsum, 1-5 parts of quick lime and 0.001-0.003 part of a coagulant or a retarder. The preparation method comprises the following steps: drying semi-hydrated phosphogypsum, weighing dried semi-hydrated phosphogypsum, quick lime, dehydrate phosphogypsum and the coagulant or retarder according to a proportion, uniformly mixing, and adding water, thereby obtaining the semi-hydrated phosphogypsum filling slurry. The filling material disclosed by the invention effectively utilizes the by-product, namely dehydrate phosphogypsum, is high in strength, excellent in fluidity and excellent in bleeding rate and can be widely applied to the field of mine filling.
Description
technical field [0001] The invention belongs to the field of mine filling materials, in particular to a hemihydrate phosphogypsum filling material and a preparation method thereof. Background technique [0002] Phosphorus chemical enterprises will produce a large amount of phosphogypsum. In order to solve the problem of the outlet of solid waste, many existing studies want to use it in mine filling. Paste filling technology can increase the concentration of filling slurry, reduce the bleeding rate and the solidification time of filling materials, and is one of the best technologies for phosphogypsum filling. If phosphogypsum is successfully applied to underground and surface cement filling, it can not only maintain the stability of surrounding rock, reduce surface subsidence, improve the recovery rate of natural resources and protect the environment, but also completely solve the environmental pollution problem of phosphogypsum storage and ensure the sustainable development ...
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