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Recovery and treatment method for material attached to side walls in hard alloy spray granulation, recycled material and mixed powder material

A cemented carbide, spray granulation technology, applied in the field of cemented carbide, can solve the problems of affecting the performance of cemented carbide, the loss of cobalt element, and the low utilization rate of cemented carbide material, so as to reduce the production cost, reduce the loss, metal The effect of less element loss

Pending Publication Date: 2020-08-25
四川科力特硬质合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The tower washing material is mainly composed of undissolved cemented carbide and solution. At present, the treatment of the tower washing material is mostly delivered directly to the lower-level treatment plant for centralized treatment, or the washing tower material is diluted with water and directly mixed with the hard alloy. The cemented carbide powder is mixed for reuse; the first treatment method leads to a serious loss of cobalt element; the second treatment method directly mixes the tower washing material with the cemented carbide powder, resulting in the processed cemented carbide powder There are many impurity elements in the medium, which affect the performance of the cemented carbide, and the utilization rate of the cemented carbide material in the direct use of the tower washing material is low

Method used

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  • Recovery and treatment method for material attached to side walls in hard alloy spray granulation, recycled material and mixed powder material
  • Recovery and treatment method for material attached to side walls in hard alloy spray granulation, recycled material and mixed powder material
  • Recovery and treatment method for material attached to side walls in hard alloy spray granulation, recycled material and mixed powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: The treatment of the spray granulation tower and the wall attached material on the tower wall after the cemented carbide material with a cobalt content of 8% is prepared.

[0027] The phosphoric acid solution is heated, and the tower wall is washed repeatedly with a high-pressure water gun until it is completely washed, and the washing liquid is collected to obtain the tower washing material.

[0028] Use morpholine solution to adjust the pH value of the washing material to 7, and detect the Co in the washing material 2+ Then add the corresponding amount of oxalic acid solution, and stir at the same time, until the reaction is completed, let the solution stand, separate the solid and liquid, leave the precipitate, wash the precipitate with deionized water, and then dry the precipitate at 80 ° C , crushed to below 80 mesh.

[0029] Detect that the oxygen content in the precipitate is 3.72%, calculate the amount of carbon black required, mix the carbon black a...

Embodiment 2

[0036] Example 2: Treatment of the spray granulation tower after the hard alloy material with a cobalt content of 6%, and the wall attached material on the tower wall.

[0037] The phosphoric acid solution is heated, and the tower wall is washed repeatedly with a high-pressure water gun until it is completely washed, and the washing liquid is collected to obtain the tower washing material.

[0038] Dilute the washing material with water, and adjust the pH value of the washing material to 7-9 with triethanolamine solution, and detect the Co in the washing material. 2+ Then add the corresponding amount of ammonium oxalate solution, and stir at the same time, until the reaction is completed, let the solution stand, separate the solid and liquid, leave the precipitate, wash the precipitate with deionized water, and then dry the precipitate at 80 ° C Dry, crush and pass through 80-mesh sieve.

[0039] Detect that the oxygen content in the precipitate is 3.65%, calculate the amount...

Embodiment 3

[0046] The difference from Example 1 is that in this example, the temperature of the vacuum calcination process is 800° C., and the rest of the steps and parameters are the same as those of Example 1.

[0047] After testing, the oxygen content in the obtained recycled material was 0.48%.

[0048] Mix the regenerated material with WC, CO powder, additives, etc. according to the mass ratio of 10%, 20%, and 30% respectively to form cemented carbide powder with a cobalt content of 8%, and ball mill it into a mixed powder under a ball mill. The mixed powder is pressed into cemented carbide sample blocks, respectively No. 1-3, and the porosity, strength and hardness of each sample block are tested respectively, and the results are shown in the following table:

[0049] Carbide performance detection result in table 3 embodiment 3

[0050]

[0051] It can be seen from Table 3 that the bending strength, Rockwell hardness, porosity and number of holes of the cemented carbide obtaine...

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Abstract

The invention belongs to the technical field of hard alloy, and particularly relates to a recovery and treatment method for a material attached to side walls in hard alloy spray granulation, and a recycled material and mixed powder material after treatment. The recovery and treatment method comprises the steps of S1, adding an organic alkaline solution into a tower cleaning material to adjust thePH value of the tower cleaning material to 7-9; S2, adding a precipitant for precipitating metal ions in the tower cleaning material into the tower cleaning material treated in the step of S1, standing, removing liquid supernatant, and obtaining a precipitated material; and S3, taking the precipitated material obtained in the step of S2 to mix with carbon black, and then carrying out calcination under a vacuum condition to obtain the recycled material. According to the recovery and treatment method for the material attached to the side walls in hard alloy spray granulation, and the recycled material and mixed powder material after treatment, the PH value is firstly adjusted by using alkaline so as to remove phosphoric acid in the tower cleaning material, so that a P element attached to hard alloy in the tower cleaning material is reduced; and by means of the recovery and treatment method, the loss of metal elements in the treatment process can be reduced, P and O elements in the recycled material can be effectively removed, and thus the recycled material can be directly mixed with hard alloy powder to be used for preparing the hard alloy.

Description

technical field [0001] The invention belongs to the technical field of hard alloys, and in particular relates to a method for recovering and treating wall attachment materials, regenerated materials and mixed powder materials for spray granulation of hard alloys. Background technique [0002] Spray granulation is a common process for preparing cemented carbide powder. In the process of spray granulation, cemented carbide powder will adhere to the tower wall. With the accumulation of time, the adhered material on the tower wall will become more and more If there are too many, it will cause rough surface on the surface of the tower wall, which will affect the powder collection rate of spray granulation. Therefore, it is necessary to clean the tower wall in time; and, before producing different grades of cemented carbide powder, it is also necessary to clean the powder on the tower wall. Cleaning is carried out to avoid affecting the composition of the next batch of cemented ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20
CPCB22F9/20
Inventor 李佳朗宏彬
Owner 四川科力特硬质合金股份有限公司
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