China lacks cobalt resources and has few cobalt mines. At present, the cobalt and manganese resources developed and utilized in China are mainly secondary slag and ore with relatively high content. For resources such as cobalt ore, which have relatively low cobalt and manganese contents, they are not well developed due to high production costs. use. The method for processing bauxite cobalt First, the use of sulfuric acid leaching of blast furnace smelting reduction iron cobalt leaching solution after the purification process with separation of cobalt and nickel, cobalt potassium nitrite method; Second sulfuric acid leaching of a roasting air cleaning fluid on cobalt manganese-containing solution with hydrogen sulfide production Electromanganese process. In addition, there are many studies on the treatment of cobalt ore by reduction leaching. The leaching agents include iron filings, sulfites, sulfur dioxide and ferrous salts. In this study the characteristics of a cobalt Yunnan bauxite, leaching developed SO 2 - ion flotation - a solvent extraction process, and means for combining the extraction of cobalt, manganese, copper, nickel and other valuable metals, which is characterized by manganese and cobalt, nickel Copper is simultaneously leached and comprehensively recovered, which provides a feasible way for the development and comprehensive utilization of cobalt ore. First, the mineral composition Most of the cobalt-earth ore deposits in the stratified sandstone , sandy mudstone, clay rock and other layers, belonging to the weathering and leaching deposit, mainly composed of iron-manganese filled cemented breccia ore. The main minerals are produced in the form of combination of hard manganese ore, manganese ore and limonite. The gangue minerals are mainly clay minerals, followed by quartz and chalcedony. The results of multi-element chemical analysis of ore are shown in Table 1. Table 1 Multi-element chemical analysis results Second, the test principle and process In the presence of a reducing agent, the tetravalent manganese in the cobalt ore is rapidly reduced to soluble divalent manganese, thereby destroying the manganese mineral structure and allowing valuable metals such as cobalt, nickel and copper to be sandwiched in the manganese mineral matrix. Get leached. Comprehensive comparison of the leaching effects of Na 2 SO 3 , (NH 4 ) 2 SO 3 , SO 2 , Fe powder, ferrous sulfate, pyrite, etc. It is considered that using SO 2 as a reducing agent is not only economical but also considered from a process perspective. To be beneficial. The main chemical reactions of SO 2 reduction leaching are as follows: The leachate is oxidized by pyrolusite and then filtered. The copper, cobalt and nickel are recovered by ion flotation. The manganese is precipitated with ammonium carbonate. The cobalt and nickel are extracted by P507, and finally the copper sulfide concentrate and nickel sulfate and cobalt oxide are obtained. Chemical products such as manganese carbonate. Test principle The process flow is shown in Figure 1. Figure 1 Process flow of comprehensive extraction of cobalt, nickel, manganese and copper from cobalt ore Third, the results and discussion (1) SO 2 leaching and oxidation removal of cobalt ore The SO 2 liquid in the steel cylinder is used as a reducing leaching agent, and the flow rate is controlled by a flow meter. The test results show that the leaching rate of cobalt, nickel and manganese increases with the increase of SO 2 dosage, and the copper leaching rate is relatively less affected. Acidity has a significant effect on copper and iron leaching, but has little effect on leaching rates of manganese, cobalt and nickel. When the SO 2 mass fraction is 2% to 3%, the acid leaching speed is faster. During the reduction leaching process, the leaching rate of iron decreases with the leaching time. The reason is that some iron minerals in the cobalt ore are dissolved at the beginning of the leaching, and some of the iron is dissolved due to the decrease of the acidity of the solution in the later stage of leaching. It is again precipitated in the form of Fe(OH) 3 and enters the leaching slag. A large amount of heat is released during leaching to raise the temperature of the system. After SO 2 leaching, the pyrolusite is added for further oxidation for 30 to 60 minutes, the ferrous iron is oxidized to ferric iron, and then the pH is adjusted to 4.5, so that Fe 3 + is removed from the solution as a precipitate of Fe(OH) 3 . The amount of pyrolusite added is 1/30 of the ore quality. After the iron removal, the mass concentration of Fe 3 + in the leachate is less than 0.001 g ∕L. The optimum leaching conditions are as follows: the amount of SO 2 is 0.192t per t cobalt ore, the ore particle size is 85-200 mesh, the temperature is 45-55 ° C, the liquid-solid mass ratio is 4:1, the leaching time is 40-60 min, and the end pH is 2, stirring speed 300r∕min. Under these conditions, the leaching rates of Mn, Co, Ni, and Cu were 99.76%, 99.63%, 98.26%, and 91.77%, respectively. (2) Copper ion precipitation Sodium sulfide reacts with copper ions to easily form copper sulfide precipitates. First, a sodium sulfide solution having a mass concentration of 200 g ∕L was slowly added to the iron-removing liquid, and the pH of the solution was adjusted to 0.5 to recover copper in the form of a copper sulfide concentrate. When the pH is too high, there is a certain loss of cobalt and nickel, and when the pH is too low, a large amount of acid and alkali are consumed. When the pH is 0.5 and the mass ratio of Na2S to Cu 2 + is about 5:1, the mass concentration of copper in the flotation tail liquid can be reduced to 0.001g∕L, the basic precipitation is complete, the copper recovery rate is 98.84%, and the loss of nickel and cobalt The rate is less than 0.5%. (III) Separation of cobalt and nickel by ion flotation The cobalt (nickel) ion reacts with ethyl sulfonate to form cobalt ethyl sulfonate (nickel), and its activity product is smaller than that of manganese sulfonate, so cobalt (nickel) can be removed from the solution. Separated in. The pH of the copper precipitation mother liquor was adjusted to 3.5 to 4 with sodium carbonate, and sodium ethyl xanthate was added to form cobalt (nickel) ions to form an easily floatable ethyl xanthate (nickel). The flocculated cobalt (nickel) concentrate is subjected to two alkaline washings and two picklings, and ethyl xanthate is recovered. The test results show that the flotation of cobalt (nickel) ions is greatly affected by the pH of the solution. pH<3.5, xanthate is easy to hydrolyze; pH>4, although the flotation rate is slightly increased, the alkali consumption is multiplied; when the pH is 3.5, the recovery rate of cobalt and nickel is more than 98%, and the manganese loss rate is less than 2%. (4) Preparation of manganese carbonate from flotation tail liquid The ion flotation tail liquid contains a small amount of zinc , copper, cobalt, nickel, etc., which needs to be further purified and removed. These impurities can be removed by adding 1.1 times the theoretical amount of industrial sodium sulfide and controlling the temperature above 60 °C. The solution is decontaminated and concentrated by evaporation to obtain a higher concentration of manganese sulfate solution. After coarse filtration, the mass concentration of manganese sulfate in the solution is greater than 250 g/L, and the manganese loss rate is less than 0.3%. The crystallization mother liquor is adjusted to pH about 5 with sodium carbonate. After filtration, manganese is precipitated with ammonium hydrogencarbonate, and the amount of manganese added is 1.05 times of the theoretical amount. After filtration and drying, the manganese carbonate product is obtained, and the quality thereof reaches the export standard of the Ministry of Chemical Industry. The recovery rate of manganese carbonate was 98.66% based on the flotation tail liquid. (5) Preparation of cobalt oxide and nickel sulfate from cobalt sulfide nickel slag 1. Sulfation roasting and leaching The cobalt sulfide residue is calcined by sulfation to form soluble cobalt nickel sulfate. Calcination conditions: calcination at 350 ° C for 45 min, calcination at 550 ° C for 30 min; liquid-to-solid mass ratio of 4:1 during water immersion, leaching for 1 h, at which time the leaching rates of cobalt and nickel were 98.44% and 94.83%, respectively. 2, cobalt, nickel separation Containing nickel, cobalt leachate with P204 extracted impurity, the organic phase is pre-saponified 25% P204 + 75% sulphonated coal oil, 8 countercurrent extraction, extraction flow ratio (qo / qe) is 1 / 1.5; loaded organic phase was washed with 1.0 The mol/L sulfuric acid solution was washed in a countercurrent state of 3, and the washing flow ratio (qo∕qe) was 118. After removing the impurities, the cobalt was separated by extraction with P507 to separate from the nickel. The organic phase is 25% P507 + 75% kerosene (saponification rate 70%), the aqueous phase pH is 3.5-4.5, the extraction flow ratio (qo∕qe) is 9∕40, and the cobalt extraction rate is greater than 99.5%. A small amount of nickel in the organic phase is washed with a high-Co∕Ni mass ratio sulfuric acid washing solution, the mass concentration of cobalt in the washing liquid is 10-30 g∕L, the nickel mass concentration is 0-10 g∕L, the washing water pH is 4.5, and the washing flow ratio is Qo∕qe)=4/7 (The washing liquid in the production process can be prepared by using the unwashed nickel cobalt stripping solution). When the mass of Co∕Ni in the washing liquid is relatively large, the washing liquid extracts cobalt back. Level 10 countercurrent extraction, grade 8 wash. The cobalt-containing organic phase is back-extracted with a 1.0-1.5 mol/L sulfuric acid solution, the back extraction flow ratio (qo∕qe) is 45/10, and the cobalt stripping rate is greater than 99.8%. The cobalt stripping solution is acidified by oxalic acid and then added with ammonium oxalate solution to precipitate cobalt oxalate. After filtration, the cobalt oxalate is washed with boiling water to neutrality and calcined at 500 ° C for 1 to 1.5 hours to obtain cobalt oxide powder, the quality of which meets the highest quality requirements of the cemented carbide factory. The cobalt extraction residual solution is a nickel sulfate solution, and the cobalt is extracted by P204 extraction. The extraction conditions were as follows: organic phase 25% P204 + 75% No. 200 solvent oil, saponification rate 70%, 3-stage countercurrent extraction, flow ratio (qo∕qe) was 1∕1. The nickel-containing organic phase is back-extracted with 1.0 mol/L sulfuric acid, and the stripping solution is concentrated and crystallized at about 90 ° C to obtain crystalline nickel sulfate. The quality of the obtained nickel sulfate product meets the requirements of the national first-class product. Fourth, the conclusion The SO 2 leaching-ion flotation-P507 solvent extraction process can extract valuable metals such as cobalt, nickel, copper and manganese from the cobalt ore. The manganese recovery rate is greater than 97%, the cobalt recovery rate is greater than 95%, and the total nickel recovery is greater than 90%. The quality of the obtained manganese carbonate, nickel sulfate and cobalt oxide powders complies with the national first-class standard. Low-pressure Hydraulic Hose is a flexible tubing used to transport hydraulic fluid under low pressure in hydraulic systems. Unlike high-pressure hydraulic hoses, they are typically not reinforced with steel wires and are designed to handle less pressure. Low Pressure Hydraulic Hose Factories,Low Pressure Hydraulic Hose Manufacturers,Low Pressure Hydraulic Hose Factory,Low Pressure Hydraulic Hose Suppliers,Low Pressure Flexible Hydraulic Hose Zhejiang Hanying Technology Co., Ltd. , https://www.hydraulicfactory.com
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