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Method and system for preparing lime from waste artificial engineered stones

A technology of artificial granite and lime, which is applied in the field of making lime from waste artificial granite, can solve the problems of artificial granite being difficult to reuse, occupying land area, and low lime purity, so as to achieve good lime quality, resource saving and high purity. Effect

Active Publication Date: 2017-12-22
广西广厦环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Artificial granite is mainly used for decoration, and the remaining artificial granite after decoration or factory processing is directly discarded. According to statistics, the amount of discarded artificial granite in Hezhou City is about 500,000 tons a year, and the 500,000 tons of discarded artificial granite It is difficult to be reused and is usually discarded directly near the area after use due to transportation troubles, seriously occupying land area and causing a waste of resources
Because it contains a relatively large amount of calcium carbonate, it is more suitable for making lime, but because it also contains more other impurities, the lime obtained by directly burning it has low purity and poor quality

Method used

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  • Method and system for preparing lime from waste artificial engineered stones

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Effect test

Embodiment 1

[0046] The waste artificial granite is sent to the pulverizer 120 to be pulverized into artificial granite powder, and the powder is sent to the pre-burning furnace 110 and burned for 2 hours under the environment of 300°C to remove the organic resin. The generated gas passes into the waste gas absorbing device 111, and the waste gas absorbing device 111 contains lye to remove the tail gas. After burning, it is transported to the first mixed reaction tank 140 to react with the nitric acid solution with a mass concentration of 25%. The mass ratio of the waste artificial granite powder after burning to the nitric acid solution is 1:47.5, and the reaction time is 40min. The solid-liquid mixture is passed through the first filter 150 for filtration to obtain the first filter residue and the first solution. The first filter residue is burned in the third calcination furnace 130 at 150° C. to obtain silica, and the two Silica recovery. Pass the first solution into the second mixing...

Embodiment 2

[0048] The waste artificial granite is sent to the pulverizer 120 to be crushed into artificial granite powder, and the powder is sent to the pre-burning furnace 110 and burned for 1 hour at 700°C to remove the organic resin. The generated gas passes into the waste gas absorbing device 111, and the waste gas absorbing device 111 contains lye to remove the tail gas. After burning, it is transported to the first mixed reaction tank 140 to react with nitric acid solution with a mass concentration of 32%. The mass ratio of the waste artificial granite powder after burning to the nitric acid solution is 1:37, and the reaction time is 200min. The solid-liquid mixture is passed through the first filter 150 for filtration to obtain the first filter residue and the first solution, and the first filter residue is burned in the third calcination furnace 130 at 200°C to obtain silica, and the two Silica recovery. Pass the first solution into the second mixing reaction tank 160, add sodiu...

Embodiment 3

[0050] The waste artificial granite is sent to the pulverizer 120 to be crushed into artificial granite powder, and the powder is sent to the pre-burning furnace 110 and burned for 1.5 hours at 500°C to remove the organic resin. The generated gas passes into the waste gas absorbing device 111, and the waste gas absorbing device 111 contains lye to remove the tail gas. After burning, it is transported to the first mixed reaction tank 140 to react with the nitric acid solution with a mass concentration of 28%. The mass ratio of the waste artificial granite powder after burning to the nitric acid solution is 1:40, and the reaction time is 60min. The solid-liquid mixture is passed through the first filter 150 for filtration to obtain the first filter residue and the first solution. The first filter residue is burned in the third calcination furnace 130 at 170° C. to obtain silica, and the two Silica recovery. Pass the first solution into the second mixing reaction tank 160, add s...

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Abstract

The invention relates to the field of preparation of building materials, and provides a method for preparing lime from waste artificial engineered stones. The method comprises the following steps: adding a nitric acid solution with the mass concentration of 25%-32% in artificial engineered stone without organic resin, reacting for 40-200 minutes, and then filtering to obtain a first solution and first filter residues, wherein the mass ratio of the waste artificial engineered stones to the nitric acid solution is 1: 37-47.5; adding sodium carbonate solids in the first solution, reacting for 35-150 minutes, and then filtering to obtain a second solution and second filter residues, wherein the mass ratio of the sodium carbonate solids to the artificial engineered stones is 1: 1.64-1.93; and firing the second filter residues at the high temperature of 900-1,100 DEG C for 2-4 hours to obtain finished lime. By the method, resources can be recycled effectively, and the quality of the prepared lime is good. The invention further provides a system for preparing the lime from the waste artificial engineered stones by using the method. The system is simple in structure, and resources can be saved effectively.

Description

technical field [0001] The invention relates to the field of building material preparation, in particular to a method and a system for producing lime from waste artificial granite. Background technique [0002] Artificial granite is mainly used for decoration, and the remaining artificial granite after decoration or factory processing is directly discarded. According to statistics, the amount of discarded artificial granite in Hezhou City is about 500,000 tons a year, and the 500,000 tons of discarded artificial granite It is difficult to be reused and is usually discarded directly near the area after use due to transportation troubles, seriously occupying land area and causing a waste of resources. Because it contains a relatively large amount of calcium carbonate, it is more suitable for making lime, but because it also contains more other impurities, the lime obtained by directly burning it has low purity and poor quality. Contents of the invention [0003] The inventi...

Claims

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Application Information

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IPC IPC(8): C04B2/10
CPCC04B2/10
Inventor 张金团谢东成张怀阳陈肇壮蔡军胡琴
Owner 广西广厦环保科技有限公司
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