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Method for recovering zirconia, mullite and rare-earth from foundry molding sand waste

A mullite and casting technology, which is applied in the field of resource recovery and recycling, can solve the problems of occupying land resources, not being fundamentally treated, and not finding a treatment method, so as to reduce environmental pollution and improve resource utilization.

Inactive Publication Date: 2010-08-11
全南晶环科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's iron and steel industry has developed rapidly. In 2007, the output of steel reached 489 million tons, and the output of stainless steel was 7 million tons. A suitable treatment method has not been found yet, and most enterprises only landfill it, but in fact it has not been fundamentally treated, which not only occupies land resources but also pollutes the environment

Method used

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  • Method for recovering zirconia, mullite and rare-earth from foundry molding sand waste
  • Method for recovering zirconia, mullite and rare-earth from foundry molding sand waste

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Send 1,000 kg of stainless steel precision casting sand waste to the hopper of the crushing magnetic separation workshop, and send it to the 2PG610×400 type roller crusher through the (Z)MBR1000 disc feeder for primary primary crushing, and the crushed material is passed through the TD75 type B500 The belt conveyor is sent to the customized cylindrical vibrating screen with a screen hole size of 20mm. During the conveying process, the RCDB-6.5 dry electromagnetic iron remover is used for the first-level iron removal. Secondary iron removal is carried out in the process, and the fine material is removed in the third stage during the transportation process, and enters the 2PG400×250 type roller crusher for secondary fine crushing. Carry out secondary fine crushing, the fine material passes through a 16-mesh cylindrical sieve, the coarse material enters the MBY1000×2400 rod mill for crushing and returns to pass through a 16-mesh cylindrical sieve, and then passes through a ...

Embodiment 2

[0022] Send 1,000 kg of stainless steel precision casting sand waste to the hopper of the crushing magnetic separation workshop, and send it to the 2PG610×400 type roller crusher through the (Z)MBR1000 disc feeder for primary primary crushing, and the crushed material is passed through the TD75 type B500 The belt conveyor is sent to the customized cylindrical vibrating screen with a screen hole size of 20mm. During the conveying process, the RCDB-6.5 dry electromagnetic iron remover is used for the first-level iron removal. Secondary iron removal is carried out during the process, and the fine material is removed in the third stage during the transportation process, then sent to the acid leaching pot and impregnated with 0.5mol / L hydrochloric acid, filtered, and the filtrate is adjusted to pH 5.4 with ammonium bicarbonate to remove impurities, and the second stage is precipitated Obtain 35 kilograms of rare earth carbonates. The filter residue enters the 2PG400×250 roller crus...

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Abstract

The invention relates to a method for reclaiming zirconia, porzite, and rare earth from foundry sand waste and belongs to the technical field of resource reclaiming, circulation and utilization. The method has following main technical characteristics: the foundry sand waste is subjected to crushing and magnetic separation to separate most of iron firstly; the foundry sand waste after iron removalis subjected to acid leaching, filtering, rare-earth separation and further fine crushing; and the porzite and zircon sand with different specifications are separated out through multilevel sieving, a rocking bed and other gravity beneficiation. The method solves the difficult problems that foundry waste slag can not be reclaimed and utilized as the foundry waste slag is mixed with iron particlesand is sintered into a massive shape and also solves the problems that the waste slag is subjected to treatment of random abandoning, stacking and landfill to cause the occupation of land resource and the environmental pollution, thus the resource is fully and comprehensively utilized.

Description

technical field [0001] The invention relates to a method for recovering zirconia, mullite and rare earth from foundry sand waste, and belongs to the technical field of resource recovery and recycling. technical background [0002] The shortage of world resources such as oil and iron ore and the current situation of skyrocketing prices have seriously restricted the development of the national economy. It is imperative for enterprises to establish low-input, high-output, low-pollution, high-cycle production systems and monitoring systems. . my country's iron and steel industry has developed rapidly. In 2007, the output of steel reached 489 million tons, and the output of stainless steel was 7 million tons. A suitable treatment method has not been found yet, and most enterprises only landfill it, which has not been fundamentally treated in fact, which not only occupies land resources but also pollutes the environment. Contents of the invention [0003] The purpose of the pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02C01F17/00C01B33/26
Inventor 邬元旭钟月明黄日平凌卫东陈勇春罗志强邬元斌
Owner 全南晶环科技有限责任公司