Method for removing silicon from phosphogypsum in obverse floatation way under acidic condition

A technology of acidic conditions and phosphogypsum, applied in flotation, solid separation, etc., can solve the problems of cement products not up to standard, small scale of resource reuse, unstable product quality, etc., and achieve significant social and environmental benefits and low processing costs The effect of low cost and excellent product quality

CN103464288AInactive Publication Date: 2013-12-25YUNNAN CHEM RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-12-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for removing silicon from phosphogypsum in an obverse floatation way under an acidic condition, comprising the steps of (1) adding waste liquid of pool water of a phosphogypsum stack into phosphogypsum slurry which is washed three times for slurry adjustment during the process of producing phosphoric acid by a wet method to obtain ore pulp at the concentration of pH 1.5-3; (2) properly adding a flotation collector i.e. ether amine salt and a foaming agent i.e. alkyl alcohol; obtaining gypsum concentrate with less than 3% of silica in flotation foam and tailings with rich silica and impurities in flotation bottom flow through the separation processes of one time of roughing, one time of scavenging and two to three times of fine flotation separation; processing the foam and the bottom flow by using a thickening system, a sedimenting system and a separating system to obtain selected gypsum products and byproducts with more silica. According to the method for removing the silicon from the phosphogypsum in the obverse floatation way under the acidic condition, as the floatability difference of the ether amine salt to the gypsum and the silica under a highly acidic condition is fully utilized, a new technology for removing the silica from the phosphogypsum in the obverse floatation way is obtained; the method has the advantages that the processing cost is low, the indexes of a floatation and separation technology are stable, the purity of the selected gypsum products is high, and the requirement on the recycling reutilization of the phosphogypsum can be met.
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Description

technical field

[0001] The invention relates to a method for positive flotation desiliconization of phosphogypsum under acidic conditions, in particular to a production method for removing silicon dioxide by sorting phosphogypsum as a by-product of phosphoric acid in a wet process. It belongs to the field of reuse of by-product resources. Background technique

[0002] During the production process of wet-process phosphoric acid, every ton of phosphoric acid (100P 2 o 5 %) produces about 4.5-5.5 tons of phosphogypsum. With the development of the domestic high-concentration phosphorus compound fertilizer industry, the current on-site stockpile of phosphogypsum has reached 300 million tons, and is increasing at a rate of 50 million tons per year. Since the phosphogypsum by-product of wet-process phosphoric acid is highly acidic (pH 1.5~2), long-term stockpiling will damage the ecological environment, which directly affects the sustainable development of the high-concentration...

Examples

Embodiment 1

[0026] Example 1 : Phosphogypsum after three washings in the phosphoric acid production workshop of Furui Branch of Yuntianhua Group (see Table 1 for its composition), was added with Furui phosphogypsum stockyard pool water waste liquid to make the concentration of phosphogypsum slurry 30%, and dodecyl ether A 1% aqueous solution made of amine and lauryl alcohol is used as a flotation agent. The dosage of dodecyl ether amine is 250g / t, and the dosage of lauryl alcohol is 20g / t. The tank floatation is carried out under the conditions of pH=1.58 and temperature 20°C. Gypsum concentrate with a grade of 97.12% and a yield of 80.51% was obtained after one roughing, one sweeping and three beneficiations (see Table 1 for its composition).

[0027]

[0028] Table 1 Composition of phosphogypsum before and after desilication by flotation

[0029]

Embodiment 2

[0030] Example 2: Using phosphogypsum after three washings in the phosphoric acid production workshop of Furui Branch of Yuntianhua Group (see Table 2 for its composition), adding Furui phosphogypsum stockyard pool water waste liquid to make the concentration of phosphogypsum slurry 25%, adding lauryl ether A 2% aqueous solution made of amine and lauryl alcohol is used as a flotation agent, the dosage of dodecyl ether amine is 300g / t, the dosage of lauryl alcohol is 25g / t, and the tank floatation is carried out under the conditions of pH=1.83 and temperature 20℃ Gypsum concentrate with a grade of 96.64% and a yield of 81.74% was obtained after one roughing, one sweeping and two beneficiation (see Table 2 for its composition).

[0031] Table 2 Composition of phosphogypsum before and after desilication by flotation

[0032]

Embodiment 3

[0033] Example 3: Use the phosphogypsum after three washings in the phosphoric acid production workshop of Sanhuan Branch of Yuntianhua Group (see Table 3 for its composition), add Sanhuan phosphogypsum stockyard pond water waste liquid to make the concentration of phosphogypsum slurry 30%, and mix dedecyl ether amine, A 1% aqueous solution made of n-octanol is used as a flotation agent, the dosage of decanyl ether amine is 250g / t, the dosage of n-octanol is 25g / t, and the tank flotation is carried out under the conditions of pH=1.52 and temperature 20℃ , after one roughing, one sweeping and two beneficiation, a gypsum concentrate with a grade of 94.88% and a yield of 81.51% was obtained (see Table 3 for its composition).

[0034]

[0035] Table 3 Composition of phosphogypsum before and after flotation desilication

[0036]