Preparation process and device of a purification type phosphogypsum cement retarder
The invention relates to a cement retarder and a technology for preparation process, which is applied in the field of phosphogypsum cement retarder, and can solve the problems of incomplete treatment, small amount of phosphogypsum used, and inability to completely replace it, so as to improve the comprehensive utilization rate and be beneficial to environmental protection. , the effect of saving resources and costs
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Embodiment 1
[0044] The invention provides a cement retarder prepared by purifying phosphogypsum through multiple physical and chemical methods, which is mainly made of phosphogypsum through ball milling, washing with belt filter, dehydration, repulping, and primary modification. Prepared by centrifugal dehydration and secondary modification, the formula of cement retarder is as follows (by weight percentage):
[0045] Phosphogypsum 91-94%;
[0046] No. 1 modifier (carbide slag or kiln dust) 4-6%;
[0047] No. 2 modifier (silicon active agent) 2-3%.
[0048] And as figure 1 , 2 as shown, figure 1 For preparing the technique of this kind of phosphogypsum cement retarder, figure 2 Then it is the device for realizing the process. Specifically, in this embodiment, the device for preparing cement retarder includes a ball mill system, a filter washing system, a primary modification system for reslurry, a secondary modification system for dehydration, an ashing system, and a mother liquor ...
Embodiment 2
[0083] Such as image 3 As shown, compared with Embodiment 1, the present embodiment also includes a slurry head tank 11, the outlet of the slurry pump 10 is connected with the head tank 32 inlet, the head tank 32 outlet flows into the belt filter 11, and the head tank 32 overflows The port communicates with the slurry pool 8. In this embodiment, the ground gypsum slurry enters the slurry pool 8, is sent into the slurry head tank 11 through the slurry pump 10 to adjust the liquid-solid ratio (1.25~1.30:1), and then enters the belt filter 12 for liquid Solid washing separation. All the other undescribed parts are the same as in Example 1.
[0084] After the slurry passes through the slurry head tank 11, it can ensure that the slurry enters the belt filter 12 evenly and stably, which is beneficial to the uniform thickness of the filter cake produced by the belt filter 12 and stable washing effect.
Embodiment 3
[0086] Such as Figure 4 As shown, compared with Embodiment 1, the present embodiment replaces the filter press 33 with a centrifuge 34, the outlet of the thick slurry pump 32 is connected with the inlet of the centrifuge 34, the filter cake is white fertilizer, and the filtrate enters the mother liquor pool 36 through a pipeline. All the other undescribed parts are the same as in Example 1.
[0087] The advantage of using the centrifuge 34 to separate and filter the white fertilizer thick pulp is that the moisture content of the filter cake is lower than that of the filter cake obtained by the filter press 33, which is beneficial to the post-drying treatment of the white fertilizer.
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