Topic
Sodium chlorate
About: Sodium chlorate is a research topic. Over the lifetime, 791 publications have been published within this topic receiving 6844 citations.
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TL;DR: Bates1 has shown that vanadium pentoxide acts as a catalyst for sodium chlorate in weed destruction, and suggests the possibility of enhancing the value of this salt as a herbicide by the employment of a catalyst.
Abstract: BATES1 has shown that vanadium pentoxide acts as a catalyst for sodium chlorate in weed destruction, and suggests the possibility of enhancing the value of this salt as a herbicide by the employment of a catalyst.
2 citations
TL;DR: In this paper, the nanofiltration membrane and freezing crystallization integrated technology was presented to treat crystallization mother liquor, and the results showed that Na2Cr2O7 concentration was lower than 0.05 g/L, Na2SO4 concentration was less than 1 g/l, and it could be recycled for brine refining stage avoiding the chromium pollution caused by subsequent treatment.
Abstract: In the process of sodium chlorate electrolysis production, chemical precipitation is often used to remove the sulfate radical in the crystallization mother liquor which leads to the dichromate deposit to salt sludge together with sulfate, and finally causes chromium pollution. The nanofiltration membrane and freezing crystallization integrated technology was presented to treat crystallization mother liquor. The research conducted in this work shows that, Na2Cr2O7 concentration was lower than 0.05 g/L, Na2SO4 concentration was lower than 1 g/L in the nanofiltration permeate and it could be recycled for brine refining stage avoiding the chromium pollution caused by subsequent treatment. The content of Na2Cr2O7 in salt sludge was less than 8.5 ppm below the 10 ppm discharge standards. Then, the nanofiltration concentrate was frozen, Na2SO4 crystallized and precipitated. The supernatant mainly containing sodium dichromate could recycle to the electrolytic system. This method not only could recycle sodium dichromate, avoiding chrome sludge generated, but also could remove sulfate radicals.
Key words: Sodium chlorate, chrome sludge, nanofiltration, freezing crystallization, sodium dichromate recycling, sodium sulfate.
2 citations
Patent•
21 Dec 2004
TL;DR: In this paper, the etchant composition for copper or copper alloy comprises 0.1 to 10 wt.% of one or more oxidizing agents selected from sodium perchlorate, sodium chlorate and sodium hypochlorite.
Abstract: PURPOSE: To provide an etchant composition for copper or copper alloy which improves productivity with almost no chlorine gas discharge and enhances quality of products also by increasing etching speed. CONSTITUTION: The etchant composition for copper or copper alloy comprises 0.1 to 10 wt.% of one or more oxidizing agents selected from sodium perchlorate, sodium chlorate and sodium hypochlorite; 5 to 15 wt.% of one or more inorganic chlorides selected from potassium chloride, sodium chloride and ammonium chloride; 5 to 15 wt.% of copper (II) chloride dihydrate; 6 to 10 wt.% of hydrochloric acid; and 50 to 80 wt.% of water, wherein the etchant composition has an acidity of 1.5 to 2.5N, specific gravity of 1.27 to 1.32 and copper concentration of 130 to 170 g/L.
2 citations
TL;DR: Perchlorate present in chlorate solutions is determined gravimetrically as tetraphenylphosphonium perchlorate after destruction of chlorate by addition of hydrochloric acid.
2 citations
Patent•
11 Aug 2017
TL;DR: In this article, a preparation method of a sodium chlorate generator electrode is described, which consists of matrix treatment, inner layer active coating liquid, inner-layer metal oxide, outer-layer active liquid, outer layer active layer liquid, and electrode preparation.
Abstract: The invention discloses a preparation method of a sodium chlorate generator electrode. The preparation method comprises the following steps of (1) matrix treatment, (2) preparation of inner-layer active coating liquid, (3) preparation of inner-layer metal oxide, (4) preparation of outer-layer active coating liquid, and (5) preparation of the electrode. According to the novel preparation method of the sodium hypochlorite generator electrode, the prepared electrode has the advantages of being low in chlorine evolution potential, high in oxygen evolution potential, energy-saving, environmentally friendly, long in service life and high in electrolytic efficiency.
2 citations