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Deep purification method of glauberite gypsum

A purification method, glauberite technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve problems such as limited purification and whitening effect, harsh reaction conditions, complex process, etc. , to achieve the effects of less impurity content, mild process reaction conditions, and reduced production costs

Pending Publication Date: 2022-05-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical purification method can remove the impurities on the surface of gypsum, but it cannot remove the impurities of the same size as the gypsum crystals and the impurities contained in the crystals, and the purification and whitening effect is limited
Chemical methods can destroy the crystal structure of gypsum itself, release internal impurities, and have a better purification effect on gypsum, but the process is more complicated and the reaction conditions are more harsh

Method used

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  • Deep purification method of glauberite gypsum
  • Deep purification method of glauberite gypsum
  • Deep purification method of glauberite gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The effect of sulfuric acid concentration on the removal of impurities was investigated. Take 80g of glauberite gypsum raw material and add it to 400g of 10wt% sulfuric acid solution, heat it in a water bath to 80°C in a 1000mL three-necked flask, control the motor speed to 253rpm, and pickle for 6h. After pickling, stand and filter to obtain the pickled glauberite gypsum, denoted as MG 2 ; Take an appropriate amount of gypsum to measure the chemical composition, and carry out XRD analysis test.

Embodiment 2-3

[0046] With embodiment 1, difference is that sulfuric acid concentration is adjusted to 15wt% and 30wt% respectively, obtains MG 3 and MG 4 .

[0047] The chemical composition of the gypsum of Examples 1-3 is shown in Table 1.

[0048] Table 1 Glauber's salt gypsum raw material and chemical composition (wt%) after pickling with different concentrations of sulfuric acid

[0049]

[0050]

[0051] ND: not detected; LOI: loss on ignition. XRF is a semi-quantitative test method, and the measurement results are kept to decimals

[0052] There is a certain error after the two digits after the point.

[0053] As shown in Table 1, the content of calcium sulfate dihydrate in glauberite gypsum only accounts for about 70%, and the impurity content is high and the composition is complex. It not only contains metal impurity compounds such as Fe, Al, and Mg, but also contains silicon-based impurities and carbonates. compound. Such as figure 1As shown in b, pickling can effectiv...

Embodiment 4

[0057] The effect of sulfuric acid concentration on the phase state of gypsum was investigated. Take 80g of analytically pure calcium sulfate dihydrate and add it to 400g of 20wt% sulfuric acid solution, heat it to 80°C in a water bath in a 1000mL three-necked flask, control the motor speed to 253rpm, take samples at different time points, and measure the crystal water content.

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Abstract

The invention discloses a deep purification method of glauberite gypsum, which specifically comprises the following steps: (1) mixing glauberite gypsum with an acid solution, and pickling for a certain time at a certain temperature; and (2) carrying out hydration reaction on the acid-washed glauberite gypsum at a certain temperature to obtain purified gypsum. By adopting the deep purification method disclosed by the invention, the purity of the purified glauberite gypsum can reach 97% or above, the whiteness is obviously improved, and the purified glauberite gypsum can be used as a high-quality raw material for producing high-added-value gypsum products such as high-strength gypsum, alpha-semi-hydrated gypsum whiskers and anhydrous calcium sulfate whiskers; the deep purification method disclosed by the invention also has the advantages of low production cost, mild reaction conditions, high slurry ratio, large treatment capacity and the like, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, and specifically relates to a deep purification method of glauberite gypsum, the purified glauberite gypsum prepared therefrom and applications thereof. Background technique [0002] Sodium sodium sulfate is an important basic chemical raw material, which is widely used in various fields of chemical production. Glauberite is a Na 2 SO 4 ·CaSO 4 Sedimentary rock deposits with double salt as the main component, in which Na 2 SO 4 To prepare sodium sulfate, the remaining calcium sulfate and other ingredients are discarded to form glauberite gypsum with calcium sulfate dihydrate (DH) as the main component. [0003] Glauberite gypsum is an industrial by-product gypsum. Compared with phosphogypsum and desulfurized gypsum, calcium sulfate dihydrate has a lower proportion and higher impurity content. It is mainly used as filling material in the mining area or after simple purification in i...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/468C01P2002/72C01P2004/03C01P2006/80
Inventor 李军尹会斌金央陈明
Owner SICHUAN UNIV
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