The disadvantages of the above extraction processes are: (1) for the direct leaching process using sulfuric acid, the formation of REE double sulfate cannot be avoided, so it will affect the refining process of REEs, and during this process, the …

In many studies in the literature, sulfuric acid and hydrochloric acid are the most preferred for leaching in acidic environments [32,33,34,35,36]. It is stated in the literature that the consumption of sulfuric acid, which is the cheapest solvent for leaching of oxidized copper ores [ 37 ], varies between 0.4 and 0.7 tons H 2 SO 4 per ton of ...

Acid Storage. The large storage-tank for 66° B. acid is 8 feet in diameter and 8 feet high, lined with 10-pound lead. It holds about 46,000 pounds of 66° sulphuric acid. The small tank is the old Roessler converter 4 feet in diameter and 6 feet high, and holds about 8000 pounds.

Answer (1 of 2): Sulfuric acid is overwhelmingly the cheapest acid. It also has the virtue that it is bivalent which means that it is able to dissolve twice as much per concentration as nitric or hydrochloric acids. The reason for this has to do with how easy it is to get sulfur and how you make ...

18,900 liters sulfuric acid/ha with 120 cm leaching and 27,800 liters acid/ha with 30 cm of water for leaching, respectively, Total seedling weight was highest for both of these treatments. The electrical conductivity, sodium content, and pH were affected differently to a significant extent at different depths by the same treatment. On the average,

Double distilled water and sulfuric acid (97%) were used for was studied and the effects of sulfuric acid concentration, pulp density, rinsing and leaching processes, respectively. XRF and XRD analyses of particle size, temperature and time on nickel dissolution were eval- the raw material before rinsing are shown in Table 1 and Fig. 1, re- uated.

In this study, the laterite nickel leaching process was carried out by varying the solution concentration and operating time. The concentrations of sulfuric acid and phosphoric acid solutions were varied at 5 M and 6 M concentrations, while the operating time was varied at 4 hours and 6 hours.

The leaching efficiency of nickeliferous lateritic ore is optimized by scalping the ore to remove a coarse low-nickel fraction and provide a fine nickel-rich fraction which is then high pressure leached in a sulfuric acid solution by controlling the parameters temperature, pulp density, the rate of acid addition, leaching time, agitation rate, etc., whereby a pregnant solution is obtained with ...

Sulfuric acid leaching of copper rich slag with the optimized parameters can provide a copper rich process solution with iron as the main impurity metal. The solution can provide an attractive feed for integration into the industrial primary copper production with acceptable low Ni, As and Pb levels (43.6 g/L Cu, 9.4 g/L Fe, 0.3 g/L Ni, 0.1 g/L ...

The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the in uence of various factors, to optimize the dissolution conditions, and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper.

The acid leaching method is a traditional method that is widely applied in the field of metal extraction. Peng et al. used sulfuric acid to leach manganese from EMR and studied the effects of process parameters. The effects of different parameters on the leaching recovery were comprehensively considered, and the optimum leaching conditions were ...

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting solution of sulfuric acid and copper sulfate is collected in …

In this article, the sulfuric acid leaching of industrially produced waste LIBs scraps with 23.6% cobalt (Co), 3.6% lithium (Li) and 6.2% copper (Cu) was investigated. The industrially produced LIBs scraps were shown to provide higher Li and Co leaching extractions compared to dissolution of corresponding amount of pure LiCoO 2 .

Most of the sulfuric acid production is consumed in the fertilizer industry. This applies not only to the preparation of ammonium sulfate but also to the leaching of phosphates, where 60% of the sulfuric acid produced ends up. The most common compound found in nature is calcium phosphate Ca 3 (PO 4) 2.

The disadvantages of the above extraction processes are: (1) for the direct leaching process using sulfuric acid, the formation of REE double sulfate cannot be avoided, so it will affect the refining process of REEs, and during this process, the phosphate that binds to the monazite cannot be separated immediately; (2) consumption of sodium ...

sulphuric acid solution was used and 5 g of the ground copper oxide ore with a solid to liquid. ratio of 13%. Leaching parameters such as leaching time from 0.25 – 4 h, pH range 0.5 – 4 ...

Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt therefrom. However, in order to obtain good extraction from these ores, prolonged treatment using acid of high strength and also using high pressures and recycling steps have been necessary. In the improved method of the invention nickel and cobalt is solubilized from high-magnesia ...

boiled with sulfuric acid with a concentration of 5–7 wt% for 60 min, alumina was extracted to 80 %. Leaching with sulfuric acid was carried out at 90oC and reached an acid concentration of 10–20 %13. Another patent reported 30 wt% as the recommended acid concentration14.

The optimized conditions for effective cobalt leaching were; no additive, temperature = 90 °C, sulfur di oxide = 3.7 l, sulfuric acid = 40 kg/T, time = 5 h, stirring speed 800 rpm, pulp density = 15% and particle size – 0.074 mm. The confirmation experiment was carried out after adopting the optimized values of the parameters.

High pressure sulphuric acid leaching of lateritic nickel ore 477 leaching time on high pressure sulphuric acid leaching of a local lateritic nickel ore sample having 1.37% Ni were investigated by using chemical and X-ray diffraction analyses. Other than nickel, the dissolution ratio values of …

The sulfuric acid leaching of titanium from titanium-bearing electric furnace slag (TEFS) was investigated under different experimental conditions. In the sulfuric acid leaching process, the MxTi3-xO5(0≤x≤2) and diopside could react with sulfuric acid. The optimum conditions of sulfuric acid leaching process were particle size at <

12%In many studies in the literature, sulfuric acid and hydrochloric acid are the most preferred for leaching in acidic environments [32,33,34,35,36]. It is stated in the literature that the consumption of sulfuric acid, which is the cheapest solvent for leaching of oxidized copper ores [ 37 ], varies between 0.4 and 0.7 tons H 2 SO 4 per ton of ...

All, In my previous post, i dropped 25litre of water plus 5 litre of 98% sulfuric acid for 90kg or copper ore. Is there any formula to know how much pure sufuric acid and water should be mixed for leaching reagent? Thanks Kev

SULFURIC ACID AND LEACHING REQUIREMENT 577 to twice the pore volume of a 30 cm soil layer for both cases. Water-applied acid theoretically lowers the ESP more than soil-applied acid at shallow depths, but does not remove exchangeable sodium at greater depths. The TDS at shallow depths is higher for water-applied acid.

The beneficiation of low-grade manganese ore is investigated using applied magnetics separation, multi-gravity separator, shaking table, flotation methods, and sulfuric acid leaching. The manganese content in the ore sampled from the Unagad deposit is 17.31%. The best option and high result among beneficiation experiments is the use of a multi-gravity...

Variation of solution Eh and pH during the leaching, (a) 0.732M sulphuric acid at 20oC and (b) 0.732M sulphuric acid and (0.018-0.054M) hydrogen peroxide at 20 and 25oC. Figure 3.X-ray diffraction peaks of hand-picked grains of minerals (green malachite and gray heterogenite) Table 1. XRF Analysis (%) of samples of different size fractions ...

The behaviour of zinc, iron and calcium un- der the influence of sulphuric acid as the leaching agent is discussed. The effect of temperature/pressure on the yield of the Zn-extraction is small ...

The leaching of Cu metal was enhanced by adding Cu 2+ ions and introducing O 2 in the sulfuric acid solution; e.g. the leaching efficiency of Cu increased to more than 99.9% within 30 min in 1 mol/L sulfuric acid solution with 10,000 mg/L Cu 2+ at 400 rpm with 1% pulp density, <75 µm particle size, and 100 cc/min O 2. It was also observed that ...

Fig.3 shows the leaching results as a function of sulfuric acid concentration from 2.5 to 3.5M. The neodymium in E-scrap pow-der was completely leached out after the leaching of 4h at the condi-tion of the sulfuric acid concentration of 3.0M, pulp density of 110.8 g/L, and leaching temperature of 70oC. With increasing H 2 SO4 con-

ABSTRACT. Oxalic acid was used for recovering cobalt from leaching solution of spent lithium ion battery by precipitation method. Crushed powders containing LiCoO 2 of spent lithium ion battery were obtained by crushing, magnetic separation and screening process. These powders were dissolved in 2 M H 2 SO 4 solution with H 2 O 2 as a reducing agent. After dissolving Co and Li components, the ...

@misc{etde_6501959, title = {Kinetics of sulfuric acid leaching of a uranium ore with Oxone} author = {Chutinara, D, Torma, A E, and Singh, A K} abstractNote = {The present study investigated uranium extraction from a low-grade ore with sulfuric acid and Oxone used as an oxidant. The maximum theoretically attainable rate of uranium extraction was found to be Vsub(m) = 381 mmol m/sup …

Leaching studies were carried out on Indian Ocean manganese nodules using sulphuric acid as the lixiviant. By leaching the nodules with 8 per cent sulphuric acid for 12h at 100C, copper and nickel could be completely extracted along with 50 per cent cobalt and 6.2 per cent manganese.94.2 per cent of the iron was also dissolved. To increase manganese and cobalt extraction, charcoal was used as ...

ing of sulfuric acid concentration, the leaching rate of Ni and Co increase obviously. When the sulfuric acid con- centration increased to 40 wt%, the leaching rate are above 96%, while it can be seen that the increasing is . relatively slow. Therefore the optimum sulfuric acid con- centration is …

Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature. Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about….