System and method for co-treating rare-earth polishing powder waste material through cement kiln

A rare earth polishing powder and co-processing technology, which is applied in the system field of rare earth polishing powder waste, can solve the problem that the recycling and utilization of polishing powder waste cannot be realized in an all-round way.

Pending Publication Date: 2018-09-21
长沙中硅环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Reference 1 discloses a multi-stage sedimentation recovery device for rare earth polishing powder waste; while reference 2 discloses a method for recovering ra

Method used

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  • System and method for co-treating rare-earth polishing powder waste material through cement kiln
  • System and method for co-treating rare-earth polishing powder waste material through cement kiln
  • System and method for co-treating rare-earth polishing powder waste material through cement kiln

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Experimental program
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Effect test

Embodiment 1

[0093] Such as Figure 1-3 As shown, the present invention provides a cement kiln co-processing system for rare earth polishing powder waste, including: waste pretreatment system, conversion roasting system, leaching separation system and cement kiln system; waste pretreatment system, conversion roasting system, leaching The separation systems are connected in sequence, and the conversion roasting system and the leaching separation system are respectively connected to the cement kiln system; the devices in the entire system are sealed devices, and a slight negative pressure is formed through an exhaust fan;

[0094] The conversion roasting system includes a vertical roasting furnace 10; the vertical roasting furnace 10 specifically includes:

[0095] Furnace body, the furnace body is a vertical whole constituted by an outer casing, including a left furnace body and a right furnace body separated by a middle partition wall;

[0096] The left furnace body includes an evaporation chamb...

Embodiment 2

[0135] The difference between this embodiment and embodiment 1 is that:

[0136] In this embodiment, in step (1), the rare earth polishing powder waste is first dried to a water content of 22% and then stored in the rare earth polishing powder waste bin. The mass ratio of rare earth polishing powder waste: ammonium salt: auxiliary is 1 :2:0.5; ammonium salt is (NH 4 ) 2 Cl; the auxiliary agent is a mixture of sugar and activated carbon; the particles made by the extrusion molding machine 9 are 20mm spherical particles.

[0137] In step (2), the materials in the vertical roaster are reacted for 4 hours to form a mixture of rare earth chloride salts and other chloride salts, which is the roasting slag;

[0138] In step (3), 3 times of clear water is added and a washing ball mill is used for grinding and cleaning.

Embodiment 3

[0140] The difference between this embodiment and embodiment 1 is that:

[0141] In this embodiment, in step (1), the rare earth polishing powder waste is first dried to a water content of 18% and then stored in the rare earth polishing powder waste bin. The mass ratio of rare earth polishing powder waste: ammonium salt: auxiliary is 1 :1.5:0.2; ammonium salt is (NH 4 ) 2 Cl; the auxiliary agent is a mixture of starch and activated carbon; the particles made by the extrusion molding machine 9 are 10mm spherical particles.

[0142] In step (2), the materials in the vertical roaster are reacted for 1 hour to form a mixture of rare earth chloride salts and other chloride salts, which is the roasting slag;

[0143] In step (3), 2.5 times of clear water is added and a washing ball mill is used for grinding and cleaning.

[0144] The invention adopts cement kiln to co-process rare earth polishing powder waste with the characteristics of low investment, simple production, safety and reliabil...

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Abstract

The invention provides a system and method for co-treating a rare-earth polishing powder waste material through a cement kiln. The system comprises a waste material pre-treatment system, a transformation roasting system, a leaching separation system and a cement kiln system; high-price rare-earth substances in the rare-earth polishing powder waste material are extracted through roasting by adopting ammonium salt, dissolving and recycling; residues which are produced in chemical recycling treatment of the rare-earth polishing powder waste material are treated by adopting the characteristic thatthe raw materials of the cement kiln have strong applicability; gas discharged in the chemical recycling treatment of the rare-earth polishing powder waste material is subjected to high-temperature alkaline treatment of the cement kiln, and the material is evaporated and crystallized, and dried by utilizing waste low-temperature residual heat of the cement kiln; an ammonium type denitration agentneeded for denitration of the cement kiln is used as ammonium salt needed for chemically treating the rare-earth polishing powder waste material; ammonia gas which is discharged after treatment is used as a cement kiln denitration agent and effective treatment of three wastes is realized; therefore, harmless, recycling and ultimate treatment of the rare-earth polishing powder waste material is really realized.

Description

Technical field [0001] The invention relates to a system and method for rare earth polishing powder waste, in particular to a system and method for co-processing rare earth polishing powder waste using a cement kiln, and belongs to the technical field of rare earth polishing powder waste recycling. Background technique [0002] The main component is cerium dioxide (CeO 2 ) Cerium-based rare earth polishing powder is currently the most widely used rare earth polishing powder. It is added to the flat or de-faced glass attached to the upper surface of the rotary grinder through a dispersion liquid for chemical dissolution and mechanical grinding to achieve the purpose of polishing. With the development of science and technology, rare earth polishing powder has been developed very rapidly due to its irreplaceable properties. According to statistics, the amount of rare earth polishing powder in my country has increased rapidly at a rate of 30% per year in recent years. At present, the ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C04B7/00C22B1/02
CPCC22B1/02C22B7/001C22B7/006C22B59/00C04B7/00Y02P10/20
Inventor 肖喜才
Owner 长沙中硅环保科技有限公司
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