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Resource recycling method of byproduct mirabilite

A technology of resource utilization and mirabilite, applied in artificial filaments made of viscose, electrolysis process, electrolysis components, etc., can solve the problems of reducing the service life of the membrane, low concentration, increasing the membrane resistance, etc., and achieving a long service life of the membrane , Low pretreatment requirements, and the effect of improving the reuse rate

Inactive Publication Date: 2020-05-29
厦门欣亿凯科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent: A method for producing acid-base from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis (CN201310311739.X) discloses a method for treating viscose fiber industry by-product sodium sulfate with bipolar membrane electrodialysis technology. The method has complex pretreatment process and low acid-base production efficiency, especially if the residual hemicellulose in sodium sulfate is not treated thoroughly, it will cause fatal and irreversible damage to the negative membrane in the electrodialysis equipment
Moreover, the acid concentration produced by this process is lower than 8%, especially the alkali concentration is about 5-8%. The concentration is low and cannot be reused directly, and additional evaporation and concentration are required.
Patent: Method for Comprehensive Utilization of Sodium Sulfate Wastewater (CN201010612329.5) discloses a method of using ion membrane electrolysis of sodium sulfate to prepare acid and alkali for reuse. In the disclosed method, the organic agent polyacrylamide (PAM) used for pretreatment is not Reasonably, it will increase the damage to the ion membrane; the pretreatment unit of the water quality does not increase the depth of the ion exchange resin to remove metal ions, which will increase the concentration of harmful metal ions in the electrolytic cell, resulting in blockage of the flow channel of the membrane, Increase the membrane resistance and reduce the service life of the membrane; at the same time, in this process, the mixture of sulfuric acid and sodium sulfate is finally obtained in the anolyte, which does not solve the separation problem of sulfuric acid and sodium sulfate in the anolyte, which limits the reuse of the anolyte , so that the utilization rate of sodium sulfate is reduced, and the current efficiency cannot be guaranteed

Method used

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  • Resource recycling method of byproduct mirabilite
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  • Resource recycling method of byproduct mirabilite

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 and 3 As shown, a chemical fiber production enterprise obtains Glauber’s salt by freezing crystallization method, uses the precipitated sodium sulfate decahydrate as feed material, and prepares a sodium sulfate solution with a mass concentration of 300-350g / L under the condition of 42-45°C, which contains zinc ion 287mg / L; use sodium hydroxide to adjust the pH of the above prepared sodium sulfate solution to 8.5-9.0, use plate and frame solid-liquid separation to recover zinc hydroxide from the filter residue, and the recovered zinc hydroxide is directly used in the coagulation bath section; Sodium carbonate is added to the post-zinc solution to remove calcium and magnesium chemically. After the treatment, the solution is precisely filtered by a ceramic filter and then enters the D403 cation exchange system for deep adsorption treatment of calcium, magnesium and trace zinc, so that the mass concentration of calcium ions in the effluent is less than 0.1m...

Embodiment 2

[0039] Such as figure 1 and 3 As shown, a certain Fiber Co., Ltd. produces about 100,000 tons of Glauber's salt annually, and uses the precipitated sodium sulfate decahydrate as the feed material to prepare a sodium sulfate solution with a mass concentration of 280-300g / L under the condition of 35-40°C. It contains 152mg / L of zinc ions; use sodium hydroxide to adjust the pH of the above-prepared sodium sulfate solution to 8.5-9.0, use PP filter elements to recover zinc hydroxide from the filter residue, and the recovered zinc hydroxide is directly used in the coagulation bath section; Sodium carbonate is added to the solution after zinc removal to chemically remove calcium and magnesium. After the treatment, the solution is precisely filtered by a ceramic filter and then enters the D113 cation exchange system for deep adsorption treatment of calcium, magnesium and trace zinc to achieve a concentration of calcium ions in the effluent of less than 0.1 mg / L, the mass concentrati...

Embodiment 3

[0041] Such as figure 2 and 3 As shown, a Carlin-type refractory gold ore in a certain mine is pretreated with sodium hydroxide to desulfurize and extract gold. The demand for acid and alkali is large. After the raw ore is pre-oxidized and desulfurized by sodium hydroxide, the solution is mainly sodium sulfate solution with a mass concentration of 150-200g / L; sodium carbonate and sodium hydroxide are used to adjust the pH of the sodium sulfate solution prepared above to 8.5-9.0, and ceramic After precision filtration by the filter, it enters the D403 cation exchange system for deep adsorption treatment of calcium, magnesium and other metals, so that the mass concentration of calcium ions in the effluent is less than 0.1mg / L, and the mass concentration of magnesium ions is less than 0.1mg / L; the liquid after deep adsorption treatment After filtering with a ceramic filter, ensure that the suspended matter SS of the filtrate is less than 10mg / L, and the SiO 2 Content less tha...

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Abstract

The invention discloses a resource recycling method of a byproduct mirabilite. The invention belongs to the technical field of byproduct mirabilite treatment. The resource recycling method of a byproduct mirabilite comprises the following steps: S1, adding an alkaline substance into a sodium sulfate solution with the mass concentration of 150-350g / L to adjust the pH value, and adding sodium carbonate to primarily remove calcium and magnesium ions in the solution; S2, precisely filtering the solution and then carrying out cation exchange to deeply absorb calcium, magnesium and other metal ions;S3, precisely filtering the solution again, then feeding the solution into an electrolytic cell for electrolytic treatment, preparing alkali liquor from a cathode, recycling the alkali liquor to other working sections, and preparing acid liquor from an anode; and S4, carrying out acid-salt separation on the anode liquor, and recycling the separated acid to other working sections. According to theresource recycling method of the by-product mirabilite, acid and alkali are prepared through membrane electrolysis, the generated acid and alkali can be reused in other working sections on site, andresource recycling is achieved.

Description

technical field [0001] The invention belongs to the technical field of by-product thenardite treatment, and in particular relates to a resource recycling method for by-product thenardite. Background technique [0002] Glauber's salt is the common name of sodium sulfate decahydrate, and what is usually used in industry is anhydrous sodium sulfate (commonly known as sodium sulfate). Glauber's salt has a water content of 60%. In the prior art, direct heating is often used to produce sodium sulfate decahydrate, that is, to The water evaporates, and the process consumes a large amount of steam, consumes energy, and has high production costs. [0003] Among them, the viscose fiber industry is an important basic chemical industry, and it is the main variety of man-made fibers. It uses wood and cotton wool as raw materials, and is impregnated with dilute sodium hydroxide solution to react with carbon disulfide to form cellulose sodium xanthate. Then dissolve in dilute sodium hydrox...

Claims

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Application Information

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IPC IPC(8): C25B1/16C25B1/22D01F2/08C08B9/00
CPCC08B9/00C25B1/16C25B1/22D01F2/08
Inventor 卢伯福
Owner 厦门欣亿凯科技有限公司
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