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Method for recycling chlorine element in titanium extraction slag
The invention provides a method for recycling chlorine element in titanium extraction slag. The method comprises the following steps: washing the titanium extraction slag with water until soluble chloride ions in the titanium extraction slag are completely dissolved out to obtain a first filter residue and a first filtrate which contains calcium chloride and magnesium chloride as main components; evaporating and concentrating the first filtrate to obtain a first concentrated filtrate; adding a sodium hydroxide or aluminum chloride solution into the first concentrated filtrate to completely precipitate magnesium ions and aluminum ions in the first concentrated filtrate, and washing and filtering to obtain second filter residues and second filtrate; adding a sodium carbonate solution into the second filtrate to completely precipitate Ca<2+> in the second filtrate, and filtering to obtain a third filtrate and a third filter residue; evaporating and concentrating the third filtrate to obtain a third concentrated filtrate; and electrolyzing the third concentrate filtrated to respectively obtain hydrogen, chlorine and a sodium hydroxide solution, and circulating the chlorine to a low-temperature chlorination stage containing titanium slag as a chlorine raw material. The method has the advantages of no emission of three wastes in the recycling process, energy conservation, environmental protection, improvement of the added value of the product and the like.
本发明提供了一种提钛渣中氯元素的循环利用方法，所述方法包括步骤：将提钛渣水洗至其中可溶性氯离子完全溶出，得到第一滤渣和第一滤液，第一滤液中主要成分为氯化钙和氯化镁；将第一滤液蒸发浓缩得到第一滤液浓缩液；向第一滤液浓缩液中加氢氧化钠或铝化氯溶液使其中镁离子和铝离子完全沉淀，洗涤过滤得第二滤渣和第二滤液；向第二滤液中加入碳酸钠溶液使其中的Ca2+完全沉淀，过滤得第三滤液和第三滤渣；将所述第三滤液蒸发浓缩，得到第三滤液浓缩液；对第三滤液浓缩液进行电解，分别得到氢气、氯气和氢氧化钠溶液，氯气循环到含钛渣的低温氯化阶段作为氯原料。本发明具有循环利用过程无三废排放、节能环保、提高产品附加值等优点。
Method for recycling chlorine element in titanium extraction slag
The invention provides a method for recycling chlorine element in titanium extraction slag. The method comprises the following steps: washing the titanium extraction slag with water until soluble chloride ions in the titanium extraction slag are completely dissolved out to obtain a first filter residue and a first filtrate which contains calcium chloride and magnesium chloride as main components; evaporating and concentrating the first filtrate to obtain a first concentrated filtrate; adding a sodium hydroxide or aluminum chloride solution into the first concentrated filtrate to completely precipitate magnesium ions and aluminum ions in the first concentrated filtrate, and washing and filtering to obtain second filter residues and second filtrate; adding a sodium carbonate solution into the second filtrate to completely precipitate Ca<2+> in the second filtrate, and filtering to obtain a third filtrate and a third filter residue; evaporating and concentrating the third filtrate to obtain a third concentrated filtrate; and electrolyzing the third concentrate filtrated to respectively obtain hydrogen, chlorine and a sodium hydroxide solution, and circulating the chlorine to a low-temperature chlorination stage containing titanium slag as a chlorine raw material. The method has the advantages of no emission of three wastes in the recycling process, energy conservation, environmental protection, improvement of the added value of the product and the like.
本发明提供了一种提钛渣中氯元素的循环利用方法，所述方法包括步骤：将提钛渣水洗至其中可溶性氯离子完全溶出，得到第一滤渣和第一滤液，第一滤液中主要成分为氯化钙和氯化镁；将第一滤液蒸发浓缩得到第一滤液浓缩液；向第一滤液浓缩液中加氢氧化钠或铝化氯溶液使其中镁离子和铝离子完全沉淀，洗涤过滤得第二滤渣和第二滤液；向第二滤液中加入碳酸钠溶液使其中的Ca2+完全沉淀，过滤得第三滤液和第三滤渣；将所述第三滤液蒸发浓缩，得到第三滤液浓缩液；对第三滤液浓缩液进行电解，分别得到氢气、氯气和氢氧化钠溶液，氯气循环到含钛渣的低温氯化阶段作为氯原料。本发明具有循环利用过程无三废排放、节能环保、提高产品附加值等优点。
Method for recycling chlorine element in titanium extraction slag
一种提钛渣中氯元素的循环利用方法
TANG SONG (author) / PENG TONGJIANG (author) / SUN HONGJUAN (author)
2021-11-09
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
C25B
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON- METALS
,
Elektrolytische oder elektrophoretische Verfahren für die Herstellung von Verbindungen oder von nichtmetallischen Elementen
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