Formula of precipitation neutralizer for extracting hydroxide from wastewater and extraction method of precipitation neutralizer

Abstract

The invention discloses a formula of a precipitation neutralizer for extracting hydroxide from wastewater. The precipitation neutralizer comprises the following components in percentage by mass: 3%-15% of a pH stabilizer, 2%-10% of a flocculant, 1%-8% of an oxidant, 2%-8% of a dispersing agent, 70%-85% of a neutralizer, and 5%-10% of a pH modifier, wherein the pH stabilizer is citric acid; the flocculant is polyacrylamide; the oxidant is hydrogen peroxide; the dispersing agent is sodium dodecyl benzene sulfonate; the neutralizer is ammonium bicarbonate; and the pH modifier is ammonium hydroxide. According to the extraction method, the hydroxide is extracted by sewage treatment, the precipitation neutralizer is capable of effectively processing and neutralizing the pH value of acid sewage, the sediment is extracted as a high-purity hydroxide product, and the processed sewage can also be recycled after being filtered, so that the problem of sewage drainage is solved, and the extract becomes a hydroxide product which can be marked and used.

Description

technical field [0001] The invention relates to a formula and an extraction method for extracting hydroxide, in particular to a formula of a precipitation neutralizer for extracting hydroxide in waste water and an extraction method thereof. Background technique [0002] At present, with the rapid development of the economy, the industry is more and more developed. Therefore, the disadvantages brought by the industry are becoming more and more serious, and the sewage treatment is particularly important; the main domestic sewage treatment methods: 1. Use caustic soda Neutralization oxidation precipitation method; 2, ferrous sulfate crystallization precipitation (very high investment cost, high operating cost, and higher reprocessing cost of crystals produced); 3, oxidation deep well landfill method for processing; use the above three methods To deal with these waste liquids, the acid and iron therein cannot be recovered and utilized, and secondary pollution will be generated a...

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Problems solved by technology

[0002] At present, with the rapid development of the economy, the industry is more and more developed. Therefore, the disadvantages brought by the industry are becoming more and more serious, and the sewage treatment is particularly important; the main domestic sewage treatment methods: 1. Use caustic soda Neutralization oxidation precipitation method; 2, ferrous sulfate crystallization precipitation (very high investment cost, high operating cost, and higher reprocessing cost of crystals produced); 3, oxidation deep well landfill method for processing; use the above three methods To deal with these waste liquids, the acid and iron therein cannot be recovered and utilized, and secondary pollution will be generated at the same time, and the treatment cost is high, and the social and economic benefits are low; the addition of caustic soda to the sewage can effectively neutralize the acidic sewage and make the pH of the sewage The index reaches the neutral discharge standard, but there will be a large amount of sludge precipitation after adding caustic soda for neutralization treatment, and the sludge needs to be treated and landfilled again, resulting in secondary pollution; traditional acid-base neutralization The product of: 1, ferrous sulfate (FeSO4)+sodium hydroxide (2NaOH)=ferrous hydroxide (Fe(OH) ↓)+sodium sulfate ferrous hydroxide (Na2SO44Fe(OH)2)+oxygen (O2) +Water (2H2O)=iron hydroxide (4Fe(OH)3), in fact, because of the existence and action of a large amount of sulfate ions or hydrochloride ions, basic ferric sulfate or basic salts are produced; 2, sulfuric acid Ferrous (12FeSO4)+oxygen (3O2)+water (6H2O)=ferric sulfate (4Fe2(SO4)3)+basic ferric sulfate (4Fe(OH)3FeSO4)+oxygen (O2)+water (2H2O)=basic Ferric sulfate (4Fe(OH)SO4), ferric sulfate is weakly acidic when hydrolyzed, and it mainly becomes a gray-green precipitate, and it is very unstable. It has a strong smell in the air. If it encounters high temperature, it will be deeply vulcanized. , post-processing and treatment are quite difficult; to solve the pollution of iron compounds and acids in sewage, it is necessary to deal with both iron compounds and acid compounds in order to truly solve the problem of sewage discharge, so simple ferrous sulfate crystallization Precipitation method and oxidation deep well landfill method have large investment, high energy consumption, high cost of operation and maintenance, and cannot be completely treated