Method for producing zinc by utilizing sulphate process titanium dioxide waste acid
A technology of titanium white waste acid and sulfuric acid method, which is applied in the direction of photography technology, equipment, photography auxiliary technology, etc., can solve the problems of polluting the environment, unseen problems, etc., and achieve the effects of saving processing costs, avoiding waste, and broad application prospects
Inactive Publication Date: 2012-01-25
PANZHIHUA DONGYUAN ZINC
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Problems solved by technology
[0004] The annual output of sulfuric acid titanium dioxide in my country exceeds 800,000 tons, and about 5 million tons of industrial waste acid (i.e. sulfuric acid titanium dioxide waste acid) is produced every year, which needs to be neutralized with lime and produces 6-7 million tons of waste residue, which seriously pollutes the environment
[0005] At present, there are no relevant reports on the effective use of titanium dioxide waste acid from the sulfuric acid process and low-grade zinc resources to produce high-purity zinc
Method used
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[0027] The specific implementation of the present invention will be further described below in conjunction with the examples, and the present invention is not limited to the scope of the examples.
[0028] Embodiment adopts the inventive method to prepare metallic zinc
[0029] 1. Main raw materials: titanium white waste acid from sulfuric acid process (see Table 1 for main components), gas mud (see Table 2 for main components).
[0030] Table 1 Main components of titanium dioxide waste acid from sulfuric acid process
[0031] Element
h 2 SO 4
Fe
CD
SiO 2
Mg
Ni
In
Ge
Cl
Fe
unit
g / L
g / L
g / L
g / L
g / L
mg / L
mg / L
mg / L
mg / L
mg / L
content
210-
230
28-
31
0.3-
2.0
0.05-
0.08
5-7
50-
80
40-
50
1-2
1200-
1300
110-
120
[0032] Main compon...
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The invention relates to a method for producing zinc by utilizing sulphate process titanium dioxide waste acid, belonging to the metallurgy field. The invention solves the technical problem of providing a method for producing zinc by utilizing sulphate process titanium dioxide waste acid. The method of the invention includes the following steps: a, raw material containing zinc is mixed with sulphate process titanium dioxide waste acid, so as to obtain primary lixivium and filter cake; b, the raw material containing zinc, the primary lixivium and electrolytic zinc waste electrolyte are mixed for carrying out secondary leaching, so as to obtain secondary lixivium; c, lime milk is added into the secondary lixivium to regulate the pH value of solution to be 5.0-6, filtering is carried out, and filtrate is for spare use; d, oxidant is added into the filtrate obtained in the step c, the pH value of solution is regulated to be 5.0-5.4, filtering is carried out, and filtrate is for spare use;e, zinc is added into the filtrate obtained in the step d to replace cadmium, filtering is carried out, and filtrate is for spare use; f, the pH value of filtrate obtained in the step e is regulated to be 7.5-8.0, filtering is carried out, and filtrate and filter cake are collected for spare use; g, sulphuric acid is added into the filter cake obtained in the step f for dissolution, filtering is carried out, and excessive zinc is added into the obtained filtrate, filtering is carried out again, and the filtrate is electrolyzed, thus obtaining zinc.
Description
technical field [0001] The invention relates to a method for producing zinc by using titanium white waste acid from a sulfuric acid process, and belongs to the field of hydrometallurgy. Background technique [0002] The traditional method of producing zinc is hydrometallurgical electrolytic zinc method, which mainly uses dilute sulfuric acid diluted to 20% with industrial sulfuric acid (containing 98% acid) and mixed with electrolytic waste liquid as a solvent, mixed with high-grade (50%-60%) containing Zinc raw materials (such as sand, zinc ore, zinc slag, etc.) are heated and soaked to prepare qualified electrolyte, and then electrolytically produced electrolytic zinc. It is characterized by a short process flow, simple method, and the chlorine and fluorine ions in the electrolyte are easy to meet the standards. The disadvantages are high production costs and energy consumption, polluting the environment from sand making, and shortage of zinc-containing raw materials, whic...
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IPC IPC(8): C22B3/06C22B17/00C22B3/46C22B3/22C25C1/16
Inventor 张祖光左伦远王江海
Owner PANZHIHUA DONGYUAN ZINC