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Method for preparing manganese sulfate from oil refining waste acid

A technology of manganese sulfate and manganese oxide ore, applied in the direction of manganese sulfate, etc., can solve problems such as cost increase, and achieve the effects of reducing environmental protection pressure, low cost, and comprehensive utilization of resources

Active Publication Date: 2016-12-07
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional stacking of waste acid from refinery will increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 140g oil refining waste acid to 320g water, add 98g manganese oxide ore, Mn in manganese oxide ore 4+ The content is 29.24%, and the reaction temperature is above 95°C. Slowly add 420g of qualified concentrated sulfuric acid during the reaction to maintain the reaction acidity at 5-6. After 6 hours of reaction, add 2500mL washing liquid and 1100g of manganese oxide roasting material. 2+ The content is 30.38%. After reacting for 2 hours, filter the leaching slag and leaching solution. The specific gravity of the leaching solution is 45 Baume. The water is treated and stacked; the leachate is crystallized to obtain crystallized mother liquor and crystallized MnSO 4 , where the Mn content is 32.18%, the crystallization mother liquor is returned to immerse manganese, and the crystallization of MnSO 4 After drying and crushing, it is packaged to form a qualified manganese sulfate finished product.

Embodiment 2

[0024] Add 260g oil refining waste acid to 600g water, add 182g manganese oxide ore, Mn in manganese oxide ore 4+ The content is 29.24%, and the reaction temperature is above 95°C. Slowly add 260g of qualified concentrated sulfuric acid to maintain the reaction acidity of 5-6 during the reaction. 2+ The content is 30.38%, add 60g CaCO 3 Neutralize with the acid in the solution to reduce the acidity. After reacting for 2 hours, filter to obtain leaching residue and leaching solution. The specific gravity of the leaching solution is 32 Baume. Wash the leaching residue with 10g / L sulfuric acid and water to obtain the lotion and leaching residue, and return the lotion to leaching Manganese, washing slag is treated with lime water and piled up; leaching solution is crystallized to obtain crystalline mother liquor and crystalline MnSO 4 , where the Mn content is 32.12%, the crystallization mother liquor is returned to immerse manganese, and the crystallization of MnSO 4 After dryi...

Embodiment 3

[0026] Add 140g oil refinery waste acid to 320g water, add 98g electrolytic manganese anode slag, the Mn in the anode slag 4+ The content is 45%, and the reaction temperature is above 95°C. Slowly add 420g of qualified concentrated sulfuric acid during the reaction to maintain the reaction acidity of 5-6. After 6 hours of reaction, add 3000mL of washing liquid, 1100g of manganese oxide roasting material, and the Mn in the manganese oxide roasting material 2+ The content is 30.38%. After reacting for 2 hours, the leach slag and leachate are obtained by filtering. The specific gravity of the leachate is 43 Baume. 38.27%, as lead concentrate product; crystallization of leaching solution to obtain crystallization mother liquor and crystallization MnSO 4 , where the Mn content is 32.22%, the crystallization mother liquor is returned to immerse manganese, and the crystallization of MnSO 4 After drying and crushing, it is packaged to form a qualified manganese sulfate finished produ...

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Abstract

The invention particularly discloses a method for preparing manganese sulfate from oil refining waste acid. The method comprises the following steps: taking the oil refining waste acid generated during separation in the petrochemical industry; by virtue of oxidizability of an oxidizing agent such as potassium permanganate, MnO2, manganese oxide ore and electrolytic manganese anode slag, under a strongly acidic condition in a certain liquid-solid ratio, oxidizing unsaturated organic matter into CO2 and H2O, reducing high-valence Mn into Mn<2+> which enters a solution to generate a manganese sulfate solution, concentrating and crystallizing to obtain a MnSO4 product. By the method, under the premise of ensuring that the manganese sulfate product is qualified, the oil refining waste acid can be effectively utilized; the operability is high, the utilization rate of acid and the recycling rate of metal Mn are high, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of preparation of inorganic fine chemical products, in particular to a method for preparing manganese sulfate by using waste acid from oil refining. Background technique [0002] Refining waste acid is the waste obtained from the extraction of unsaturated organic matter in petroleum in the petrochemical industry. Because it contains a variety of unsaturated organic matter and heavy metal impurities, it has not been used in the industry for MnSO 4 The precedent of the production process. At present, most of the waste acid from oil refining is recycled to the petrochemical industry through pyrolysis, but the treatment cost is relatively high. Only large-scale chemical plants use this method. Most small refineries just accumulate the acid or let other manufacturers Help with it. According to analysis and testing, the content of sulfuric acid in waste acid from refining is about 91%, and the unsaturated organic matter is...

Claims

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Application Information

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IPC IPC(8): C01G45/10
CPCC01G45/10
Inventor 杨勇明宪权魏汉可闭伟宁吴晓丹黄冠汉吴继相周明山卢国贤何溯结刘登祥许农琦谢彦吴贤图唐秀伟
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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