CN115612843A - Method for recycling valuable metal and producing byproduct gypsum from industrial calcium-containing slag - Google Patents
Method for recycling valuable metal and producing byproduct gypsum from industrial calcium-containing slag Download PDFInfo
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- CN115612843A CN115612843A CN202211096472.2A CN202211096472A CN115612843A CN 115612843 A CN115612843 A CN 115612843A CN 202211096472 A CN202211096472 A CN 202211096472A CN 115612843 A CN115612843 A CN 115612843A
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- calcium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0407—Leaching processes
- C22B23/0415—Leaching processes with acids or salt solutions except ammonium salts solutions
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Organic Chemistry (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of water treatment agent manufacture, and particularly relates to a method for recycling valuable metals and producing by-product gypsum from industrial calcium-containing slag, which comprises the following steps: firstly, calcium slag is used as a raw material, acid dissolution leaching is carried out on the calcium slag through sulfuric acid, and the calcium slag is prepared into a mixed aqueous solution; adding a certain amount of reducing agent in the reaction process of the mixed aqueous solution to enable metal oxides to enter the solution in an ion form, and reacting calcium with sulfuric acid to generate calcium sulfate crystals; step three, filter pressing is carried out for one time to form filter residue I and filter liquor I; adding an alkaline substance into the filtrate I, precipitating, and controlling the pH value of the reaction end point to be between 3.5 and 4.0 to separate nickel from other metal ions; and step five, performing secondary liquid-solid separation to form filter residue II and filtrate II containing nickel. The method solves the problems that the prior art can not effectively treat the calcium slag and can not change the calcium slag into valuables.
Description
Technical Field
The invention belongs to the technical field of water treatment agent manufacture, and particularly relates to a method for recycling valuable metals and producing a byproduct gypsum from industrial calcium-containing slag.
Background
The waste material produced in the process of liquid chemical purification in the production of nickel sulfate is calcium sulfate slag formed after calcium carbonate is added in the process of chemical purification for neutralizing acidity, the waste material is called calcium slag by the industry, the prior art cannot treat the calcium slag, so that the calcium slag is difficult to treat, and the common treatment method is a fire-entering method for treatment, so that valuable metal nickel in the waste material is recovered, but available substances still exist in the waste material, so that the waste material wastes resources and poses a threat to environmental pollution.
The calcium slag waste material is detected to have the components of 40-50% of water, 4-10% of Ni, less than 1% of AL, 15-25% of Ca, less than 2% of Cu and less than 5% of Fe.
In order to treat the calcium slag waste, the invention provides a method for recovering valuable metals and producing a byproduct gypsum from industrial calcium-containing slag, so that the calcium slag can be changed into valuables.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for recovering valuable metals and producing a byproduct gypsum from industrial calcium-containing slag, which is used for solving the problems that the prior art cannot effectively treat the calcium slag and cannot change the calcium slag into valuables.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention also provides a method for recovering valuable metals and producing a byproduct gypsum from industrial calcium-containing slag, which comprises the following steps:
step one, calcium slag is taken as a raw material, acid dissolution leaching is carried out on the calcium slag through sulfuric acid, and the calcium slag is prepared into a mixed aqueous solution;
adding a certain amount of reducing agent in the reaction process of the mixed aqueous solution to enable metal oxides to enter the solution in an ion form, and reacting calcium with sulfuric acid to generate calcium sulfate crystals;
step three, filter pressing is carried out for one time to form filter residue I and filter liquor I;
adding an alkaline substance into the filtrate I, precipitating, and controlling the pH value of the reaction end point to be 3.5-4.0 to separate nickel from other metal ions;
and step five, performing secondary liquid-solid separation to form filter residue II and filtrate II containing nickel.
And further, elutriating and filter-pressing filter residues generated in the third step to form industrial by-product gypsum and filtrate III.
And further, returning the filtrate III to the step I for treatment.
Compared with the prior art, the invention has the following beneficial effects:
according to the method for recovering valuable metals and producing the byproduct gypsum from the industrial calcium-containing slag, disclosed by the invention, the calcium slag can be effectively treated, and the harmful and environment-polluted calcium slag is converted into the industrial byproduct gypsum and the filtrate containing nickel, which can be reused for industrial production, so that the total amount of the calcium slag produced by a system is effectively reduced, and the recovery rate of valuable metal nickel in the calcium slag can reach about 90% through measurement and calculation; the calcium generates industrial byproduct gypsum, so that the total slag amount is reduced by about 70 percent, thereby achieving the purpose of quantitative reduction treatment, having considerable economic benefit, requiring less equipment for calcium slag treatment and reducing the treatment cost.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between components, is to be understood broadly, for example, as being either fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in figure 1, the invention also provides a method for recovering valuable metals and producing by-product gypsum from industrial calcium-containing slag, which comprises the following steps:
firstly, calcium slag is used as a raw material, acid dissolution leaching is carried out on the calcium slag through sulfuric acid, and the calcium slag is prepared into a mixed aqueous solution;
adding a certain amount of reducing agent in the reaction process of the mixed aqueous solution to enable metal oxides to enter the solution in an ion form, and reacting calcium with sulfuric acid to generate calcium sulfate crystals;
step three, filter pressing is carried out for one time to form filter residue I and filter liquor I;
adding an alkaline substance into the filtrate I, precipitating, and controlling the pH value of the reaction end point to be 3.5-4.0 to separate nickel from other metal ions;
and step five, performing secondary liquid-solid separation to form filter residue II and filtrate II containing nickel.
In the embodiment, calcium slag is used as an initial raw material, acid dissolution leaching is carried out, a certain amount of reducing agent is added in the reaction process, so that metal oxide enters a solution in an ion form, calcium reacts with sulfuric acid to generate calcium sulfate crystals, the calcium sulfate crystals are separated from other metal ions, and the calcium sulfate crystals are subjected to primary liquid-solid separation. The first filter residue is mainly calcium sulfate dihydrate crystal. The first filtrate is metal ion solution containing nickel, aluminum, copper and iron. And adding an alkaline substance, controlling the pH value of the reaction end point to be between 3.5 and 4.0, separating nickel from other metal ions, performing precipitation and secondary filter pressing, discharging the filter residue II serving as final slag out of the system, and using the nickel-containing filtrate II as slurrying water, wherein the slurrying water can be used as a recycled resource and continuously used as a raw material in nickel salt production or applied to other industrial production, so that the resource is saved, and the pollution degree of the calcium slag to the environment is reduced to a great extent.
The reducing agent is sodium sulfite, sodium sulfide, sulfur dioxide, hydrogen sulfide, etc.
The alkaline substance is sodium hydroxide, sodium carbonate, etc.
Example two
In this embodiment, as a further improvement of the previous embodiment, as shown in fig. 1, in a method for recovering valuable metals and producing by-product gypsum from industrial calcium-containing slag, the filter residue produced in step three is subjected to elutriation and pressure filtration to form industrial by-product gypsum and filtrate three. And returning the filtrate III to the step I for treatment.
In the step, the first filter residue is further treated, an industrial byproduct gypsum is generated through elutriation and filter pressing procedures, and the remaining third filter liquor is returned to the first filter residue for secondary treatment, so that the utilization efficiency of the filter liquor is improved, the industrial byproduct gypsum is obtained, calcium sulfate in the filter residue is fully utilized and treated, the harmless treatment and the utilization rate of the calcium slag are further improved, and the purpose of better reduction treatment is achieved.
The elutriation procedure utilizes clean water to clean nickel or other impurities attached to calcium sulfate, so that the quality of the industrial byproduct gypsum is improved, namely the purity of the industrial byproduct gypsum is improved.
The nickel or other impurities in the calcium sulfate are cleaned, so that the impurities in the calcium sulfate are relatively less, and the recovery rate of the nickel can be further improved.
Compared with the first embodiment, the first embodiment has the advantages that the utilization rate of the calcium slag is further improved, and calcium with the largest content in the calcium slag is extended to form calcium sulfate, so that the calcium slag is fully utilized. And further recovering the nickel contained in the first calcium slag, thereby further improving the utilization rate of the nickel in the first calcium slag. Finally, the recovery rate of the valuable metal nickel in the calcium slag can reach about 90 percent; calcium generates industrial byproduct gypsum, and the total slag amount is reduced by about 70%. Not only can save resources, improve the metal yield, but also can reduce the production cost of the nickel salt of enterprises.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (3)
1. A method for recycling valuable metals and producing byproduct gypsum from industrial calcium-containing slag is characterized by comprising the following steps: the method comprises the following steps:
firstly, calcium slag is used as a raw material, acid dissolution leaching is carried out on the calcium slag through sulfuric acid, and the calcium slag is prepared into a mixed aqueous solution;
adding a certain amount of reducing agent in the reaction process of the mixed aqueous solution to enable metal oxides to enter the solution in an ion form, and reacting calcium with sulfuric acid to generate calcium sulfate crystals;
step three, filter pressing is carried out for one time to form filter residue I and filter liquor I;
adding an alkaline substance into the filtrate I, precipitating, and controlling the pH value of the reaction end point to be 3.5-4.0 to separate nickel from other metal ions;
and step five, performing secondary liquid-solid separation to form filter residue II and filtrate II containing nickel.
2. The method for recovering valuable metals and producing by-product gypsum from industrial calcium-containing slag according to claim 1, which is characterized in that: and elutriating and filter pressing filter residues generated in the third step to form industrial byproduct gypsum and filtrate III.
3. The method for recovering valuable metals and producing by-product gypsum from industrial calcium-containing slag according to claim 2, which is characterized in that: and returning the filtrate III to the step I for treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211096472.2A CN115612843A (en) | 2022-09-06 | 2022-09-06 | Method for recycling valuable metal and producing byproduct gypsum from industrial calcium-containing slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211096472.2A CN115612843A (en) | 2022-09-06 | 2022-09-06 | Method for recycling valuable metal and producing byproduct gypsum from industrial calcium-containing slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115612843A true CN115612843A (en) | 2023-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211096472.2A Pending CN115612843A (en) | 2022-09-06 | 2022-09-06 | Method for recycling valuable metal and producing byproduct gypsum from industrial calcium-containing slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115612843A (en) |
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2022
- 2022-09-06 CN CN202211096472.2A patent/CN115612843A/en active Pending
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