Composition for purifying waste phosphogypsum as well as processing method and building material obtained thereby

A technology of building materials and compositions, applied in the field of building materials, can solve the problems of occupying land, scattering with the wind, pollution of the surrounding environment, etc., and achieve the effect of solving the problem of purification treatment, avoiding secondary pollution, and simple process

CN101255047AInactive Publication Date: 2008-09-03CHAOJIE ENVIRONMENTAL PROTECTION TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2008-09-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a compound which can change waste phosphogypsum into a building material and contains 100 portions of in the Mg / Al mineral powder and 30-70 portions of component A, wherein the Mg / Al mineral powder contains 80-90 per cent magnesium oxide, 1-5 per cent of the iron oxide, 1.5-10 per cent calcium oxide and 1-5 per cent phosphorus oxide and the component A is a solution of 40-60 per cent phosphate and 0.3-0.7 per cent magnesium chloride. The invention further disclosed a method for a purification treatment of waste phosphogypsum including the following steps: mixing 100 portions of Mg / Al mineral powder and 30-70 portions of component A with 100-1,200 portions of grinded waste phosphogypsum, and then naturally curing after stirring at room temperature for three to six minutes. The invention also discloses a building material containing 100 portions of Mg / Al mineral powder, 30-70 portions of component A and 100-1200 portions of grinded waste phosphogypsum.
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Description

technical field

[0001] The invention relates to the field of environmental protection, in particular to a composition for purifying and treating waste phosphogypsum and converting it into building materials, its treatment method and the building materials obtained by the method. Background technique

[0002] Waste phosphate rock gypsum is the waste after phosphorus and phosphoric acid are extracted from phosphate rock, in powder form. At present, there is no good purification method for waste phosphogypsum. The only way is to stack. This not only occupies a large amount of land, but also causes great pollution to the surrounding environment because the waste phosphogypsum is in powder form and will be scattered with the wind. Contents of the invention

[0003] The invention provides a composition for converting waste phosphogypsum into building materials, comprising 100 parts of magnesium-aluminous mineral powder and 30-70 parts of component A, wherein the magnesium-alum...

Examples

Embodiment 1～10

[0016] Mix according to the raw material formulations in Examples 1-10 in Table 1, stir for 3 minutes and then solidify naturally.

[0017] Table 1

[0018]

[0019]

Embodiment 11～20

[0021] Mix according to the raw material formulations in Examples 11-20 in Table 2, stir for 6 minutes, put into a mold with a fixed shape, and naturally solidify after extrusion molding and demoulding.

[0022] Table 2

[0023]

Embodiment 21～30

[0025] Mix according to the raw material formulations in Examples 21-30 in Table 3, stir for 5 minutes, put into a mold with a fixed shape, and naturally solidify after extrusion molding and demoulding.

[0026] table 3

[0027]

[0028]