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Acid leaching method of vanadium-containing shale

A technology of acid leaching and shale, which is applied in the field of vanadium-bearing shale hydrometallurgical extraction, which can solve the problems of large footprint, acid leaching solution that cannot directly meet the subsequent process requirements, and long acid leaching time, etc.

Active Publication Date: 2013-05-08
WUHAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Single-stage acid leaching process (Ma Shiqiang, review of vanadium extraction process from stone coal. Hunan Nonferrous Metals, 1998, 14(4): 21-24) has the disadvantages of large consumption of acid leaching agent, low vanadium acid leaching rate, and acid leaching solution cannot directly meet Subsequent process requirements and other defects
[0004] Secondary acid leaching process (Lu Zhaoling, experimental research and industrial practice of extracting vanadium pentoxide from stone coal by acid method. Hydrometallurgy, 2002, 21(4): 178~179. WANG Mingyu, XIAO Liansheng, LI Qinggang. Leaching of vanadium from stone coal with sulfuric acid. Rare metals, 2009, 18 (1): 1~4) The low pH value of the final acid leaching solution cannot meet the follow-up operation requirements, the acid leaching time is long, the energy consumption is high, Defects such as vanadium acid leaching rate less than 80%
[0005] Multi-stage acid leaching process, one is heap leaching process, the disadvantages of this process are long operation cycle, large floor area, and serious environmental problems; the other is multi-stage countercurrent stirring process such as "recovering vanadium from vanadium-containing ore Method" (US No4666512) patented technology, "A method for acid leaching coarse grains in laterite nickel ore with cyclic formic acid" (CN200810072530.1) patented technology, "continuous multi-stage countercurrent fluidized acid leaching chromite alkaline roasting clinker method and equipment" (85100396) and "a multi-stage countercurrent acid leaching method" (CN 1189389A), the process exists that the acid leaching process cannot be carried out continuously, and the acid leaching equipment needs to be used in conjunction with a screw conveyor and a hoist to The process of realizing solid-liquid separation and transporting acid leaching liquid and acid leaching slag has complex process, long operation cycle, and corresponding auxiliary equipment is not resistant to acid and alkali corrosion, etc.

Method used

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  • Acid leaching method of vanadium-containing shale
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] An acid leaching method for vanadium-containing shale, in terms of equipment, 4 vanadium-containing shale acid leaching equipment are used in series, that is, the overflow of the liquid inlet pipe 9 of each acid leaching equipment and its upper-level acid leaching equipment The pipe 2 is connected, and the overflow pipe 2 of each acid leaching equipment is connected with the liquid inlet pipe 9 of the next-level acid leaching equipment; in terms of technology, it is four stages of acid leaching and one water washing, and the specific method is as follows: figure 1 Shown:

[0046] The first level of acid leaching is to carry out one acid leaching and one water washing in the first vanadium-containing shale acid leaching equipment

[0047] First mix vanadium-containing shale calcined sand and sulfuric acid solution in the first vanadium-containing shale acid leaching equipment according to the solid-to-liquid mass ratio of 1: (1.5-2), and then perform primary acid leachin...

Embodiment 2

[0074] An acid leaching method for vanadium-containing shale, in terms of equipment, three vanadium-containing shale acid leaching equipment are used in series, that is, the overflow of the liquid inlet pipe 9 of each acid leaching equipment and its upper-level acid leaching equipment The pipe 2 is connected, and the overflow pipe 2 of each acid leaching equipment is connected with the liquid inlet pipe 9 of the next-level acid leaching equipment; in terms of technology, it is three-level acid leaching and one water washing, and the specific method is as follows:

[0075] The first-level acid leaching is the same as the first-level acid leaching of embodiment 1 except the following parameters.

[0076] The vanadium-containing shale calcined sand and sulfuric acid solution are mixed in the first vanadium-containing shale acid leaching equipment according to the solid-to-liquid mass ratio of 1: (2-2.5), and then the first-level acid leaching is carried out. The first-level acid l...

Embodiment 3

[0088] An acid leaching method for vanadium-containing shale. In terms of equipment, n vanadium-containing shale acid leaching equipment is used in series, that is, the liquid inlet pipe 9 of each acid leaching equipment is connected to the overflow pipe 2 of its upper-level acid leaching equipment, and each of the acid leaching equipment The overflow pipe 2 is connected to the liquid inlet pipe 9 of the next-level acid leaching equipment; in terms of technology, it is n-level n times of acid leaching and one water washing, and n is 5 or 6. The specific method is as follows:

[0089] The first-level acid leaching is the same as the first-level acid leaching of embodiment 1 except the following parameters.

[0090] The vanadium-containing shale calcined sand and sulfuric acid solution are mixed in the first vanadium-containing shale acid leaching equipment according to the solid-liquid mass ratio of 1: (2.5-3), and then the first-level acid leaching is carried out. The first-l...

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Abstract

The invention relates to an acid leaching method of vanadium-containing shale. In the invention, n acid leaching units for vanadium-containing shale are in series connection, i.e., liquid inlet pipe (9) of each unit is connected with overflow pipe (2) of previous unit, and overflow pipe (2) of each unit is connected with liquid inlet pipe (9) of next unit, to realize continuous production of acidleaching process; n-stage n-time acid leaching and one-time water washing are adopted, n is 3-6. The acid leaching process comprises stirring calcine and acid leaching solution at solid / liquid mass ratio of 1:(1.5-3) at 90-100 DEG C and 150-999 rpm for 30-75 min in corresponding acid leaching unit, and standing for 5-10 min. The first-stage leaching solution is 15-35% sulfuric acid solution, and the second-stage first-time to n-stage nth-time leaching solution is acid leaching solution and washing water from previous stage, so as to realize cyclic utilization of sulfuric acid solution and other acid leaching solution besides qualified acid leaching solution. The invention has the merits of simple process, low acid consumption, high vanadium leaching rate, and continuous production. The acid leaching solution satisfies requirement of subsequent extraction process.

Description

technical field [0001] The invention belongs to the technical field of vanadium-containing shale hydrometallurgical extraction technology, and in particular relates to an acid leaching method for vanadium-containing shale. Background technique [0002] In the process of vanadium extraction from vanadium-bearing shale, leaching is an indispensable process. The vanadium in vanadium-bearing shale is dissolved in water, acid, alkali and other solutions, which is convenient for enrichment and recovery in the next step. Among them, vanadium extraction by acid leaching is widely used. In the existing acid leaching process, there are single-stage acid leaching process, two-stage acid leaching process and multi-stage acid leaching process. [0003] Single-stage acid leaching process (Ma Shiqiang, review of vanadium extraction process from stone coal. Hunan Nonferrous Metals, 1998, 14(4): 21-24) has the disadvantages of large consumption of acid leaching agent, low vanadium acid leach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B34/22
CPCY02P10/234Y02P10/20
Inventor 张一敏朱晓波刘涛黄晶陈铁军包申旭吴昊
Owner WUHAN UNIV OF TECH