Method used for preparing lightweight ceramsite from sludge and copper slag

A technology of lightweight ceramsite and sludge ceramsite, which is applied in the field of non-metallic materials, can solve the problems of complex iron, low utilization rate of copper slag resources, waste of resources, etc., and achieve high economic value, efficient utilization, and improved feasibility sexual effect

Inactive Publication Date: 2019-01-22
HUBEI DABEIJIANG ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Copper slag is the residue in the development of copper ore resources, which is a by-product after copper smelting. At present, the utilization rate of copper slag resources is low, and sometimes it has brought many adverse effects to production and the surrounding environment.
According to incomplete estimates, the average slag produced per ton of copper produced in China is 2.0-2.3 tons, and the stock of copper slag in my country has exceeded 50 million tons. These copper slags contain some copper metal elements, and the iron content is about 40%. Although The mining grade of iron ore is higher than that of my country's iron ore, but due to the complex existence of iron, the utilization rate of iron resources in my country's copper slag does not exceed 1%, resulting in a huge waste of resources

Method used

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  • Method used for preparing lightweight ceramsite from sludge and copper slag
  • Method used for preparing lightweight ceramsite from sludge and copper slag
  • Method used for preparing lightweight ceramsite from sludge and copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, domestic sludge with a water content of 30% and copper slag micropowder with an iron content of 35% and a particle size of -0.074mm and accounting for 80% are mixed and stirred according to the mass fraction of dry material 75:25. Refining the mud to make it have a plasticity coefficient of 9, and then molding it into raw meal balls with a diameter of 6mm to 8mm through a granulator, and then drying the raw meal balls; placing the dried raw meal balls in a high-temperature furnace to Preheat at a preheating rate of 10°C / min to 450°C and hold for 5 minutes; then roast at a firing rate of 10°C / min, and hold for 15 minutes after firing to 1120°C; remove the sintered balls from the high-temperature furnace Take it out and let it cool down to room temperature under natural conditions. After testing, the bulk density of the sludge copper slag ceramsite product is 430kg / m 3 .

Embodiment 2

[0035] Firstly, domestic sludge with a water content of 43% and copper slag micropowder with an iron content of 33.6% and a particle size of -0.074mm and accounting for 85% are mixed and stirred according to the mass fraction of dry material 72:28. clay, so that the plasticity coefficient is 8.5, and then molded into raw meal balls with a diameter of 7mm to 9mm by a granulator, and then the raw meal balls are dried; the dried raw meal balls are placed in a high-temperature furnace, Preheat at a preheating rate of ℃ / min and raise the temperature to 500°C and hold for 6 minutes; then roast at a firing rate of 8°C / min, and then hold for 18 minutes after roasting to 1100°C; take out the sintered balls after heat preservation from the high-temperature furnace , placed under natural conditions and naturally cooled to room temperature. After testing, the bulk density of the sludge copper slag ceramsite product is 360kg / m 3 .

Embodiment 3

[0037] Firstly, domestic sludge with a moisture content of 36% and copper slag micropowder with an iron content of 37.4% and a particle size of -0.074mm and accounting for 78% are mixed and stirred according to the mass fraction of dry material at 70:30, and the sludge is smelted by a mud refining machine. mud, so that the plasticity coefficient is 8, and then molded into raw meal balls with a diameter of 5mm to 7mm by a granulator, and then the raw meal balls are dried; the dried raw meal balls are placed in a high-temperature furnace, and the Preheat at a preheating rate of ℃ / min to 480°C and hold for 7 minutes; then roast at a firing rate of 12°C / min, and after roasting to 1080°C, hold for 13 minutes; take out the sintered balls after heat preservation from the high-temperature furnace , placed under natural conditions and naturally cooled to room temperature. After testing, the bulk density of the sludge copper slag ceramsite product is 510kg / m 3 .

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Abstract

The invention discloses a method used for preparing lightweight ceramsite from sludge and copper slag. The method comprises following steps: 1, sludge and copper slag micropowder are mixed and stirring at a mass ratio of 65-90:10-35, and are subjected to milling and granulation so as to obtain raw material balls of a certain size, and the raw material balls are dried; 2, the dried raw material balls are introduced into a high temperature furnace, pre-heating to 350 to 550 DEG C is carried out at a preheating speed of 5 to 15 DEG C / min, thermal insulation is carried out for 2 to 8min; 3, sintering is carried out at a sintering speed of 5 to 15 DEG C / min until the sintering temperature reaches 1050 to 1150 DEG C, and thermal insulation is carried out for 3 to 30min; and 4, after thermal insulation sintering, the obtained sintered balls are taken out from the high temperature furnace, and are cooled to room temperature under natural conditions, or are cooled to room temperature at power off conditions so as to obtain sludge ceramsite. The method is capable of increasing copper slag solid waste utilization rate, and is high in economical value. The ceramsite prepared using the method possesses thermal insulation, sound insulation, and sound absorbing performance, and is high in quality; and the efficiency is high.

Description

【Technical field】 [0001] The invention relates to the technical field of non-metallic materials, in particular to a method for preparing lightweight ceramsite from sludge and copper slag. 【Background technique】 [0002] Ceramsite belongs to the category of aggregates, mainly including roasted ceramsite and non-fired ceramsite. Using suitable raw materials, the roasted ceramsite with certain strength and physical and chemical properties can be obtained through batching, molding, drying, roasting and cooling. Because of its low density, high strength, high porosity, high softening coefficient, stable physical and chemical properties, wide sources of raw materials, and economical and practical finished products, ceramsite is widely used in construction, gardens, agriculture, water treatment, oil extraction, chemical industry and other industries. , and play an important role. [0003] Sludge is a solid substance produced in the process of municipal and industrial sewage treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B33/138C04B33/32C04B38/06C04B38/02
CPCC04B33/1321C04B33/1328C04B33/138C04B33/32C04B38/009C04B38/02C04B38/0665C04B38/0067Y02P40/60
Inventor 谌宏海罗立群廖广东蹇守卫黄红王珊涂序周鹏飞
Owner HUBEI DABEIJIANG ENVIRONMENTAL TECH CO LTD
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