Method for preparing steam-pressed brick through gold mine tailings

A technology of gold tailings and autoclaved bricks, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of reducing the number of tailings, small processing scale, secondary pollution, etc., and achieve the realization of resources The effect of chemical utilization

Inactive Publication Date: 2013-03-20
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tailings re-election is to extract gold, silver, zinc, etc. from tailings. This method can not only improve the resource recovery rate, but also bring huge economic benefits to the enterprise, but it has the disadvantages of small processing scale, low recovery rate, and easy to produce secondary pollution. and other issues, cannot fundamentally reduce the amount of tailings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step (1). Add 375g bleaching powder to 75kg gold tailings, stir and mix and add to the feed bin;

[0020] Step (2). Add 15kg of lime and 1kg of natural gypsum to the silo after crushing and grinding;

[0021] Step (3). Add 10kg of water to the silo, stir and mix with the gold tailings, bleaching powder, lime, and natural gypsum in the silo to obtain a mixture; then put the mixture in the digestion silo for 2 hours and grind in turn;

[0022] Step (4). Send the wheel-milled mixture into a brick press and press it into adobe; after the adobe stands at room temperature for 3 hours, put it in an autoclave for autoclaving and curing for 10 hours. The temperature of the autoclave is 170°C , the pressure is 0.8 MPa, and the brick is lowered to room temperature, and the autoclaved brick product is obtained after the brick is discharged from the kettle.

Embodiment 2

[0024] Step (1). Add 418g sodium hypochlorite in 75kg gold tailings, stir and mix and add to the feed bin;

[0025] Step (2). 14kg of lime and 2g of desulfurized gypsum are broken and ground and then added to the silo;

[0026] Step (3). Add 1kg cement to the feed bin;

[0027] Step (4). Add 11kg of water to the silo, stir and mix with gold tailings, sodium hypochlorite, lime, desulfurized gypsum and cement in the silo to obtain a mixture; then put the mixture in the digestion silo for 2.5 hours and grind it by wheel ;

[0028] Step (5). Send the wheel-milled mixture into a brick press and press it into bricks; after standing for 3.5 hours at room temperature, the bricks are placed in an autoclave for 9.5 hours of autoclaving. The temperature of the autoclave is 175 ℃, pressure 0.9MPa, down to room temperature, after the adobe comes out of the kettle, the autoclaved brick product is obtained.

Embodiment 3

[0030] Step (1). Add 468g calcium hypochlorite in 78kg gold tailings, stir and mix and add to the feed bin;

[0031] Step (2). 13kg of lime and 3kg of phosphogypsum are broken and ground and added to the feed bin;

[0032] Step (3). Add 2kg cement to the feed bin;

[0033] Step (4). Add 12kg of water to the silo, stir and mix with gold tailings, calcium hypochlorite, lime, phosphogypsum and cement in the silo to obtain a mixture; then place the mixture in the digestion silo for 3 hours and Wheel mill;

[0034] Step (5). Send the wheel-milled mixture into a brick press and press it into adobe; after the adobe stands at room temperature for 4 hours, put it in an autoclave for autoclaving for 9 hours, and the control temperature of the autoclave is 180°C , the pressure is 1.0 MPa, and it is lowered to room temperature, and the autoclaved brick product is obtained after the adobe comes out of the kettle.

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Abstract

The invention discloses a method for preparing a steam-pressed brick through gold mine tailings, solving the problems that few technologies are provided for specially processing the gold mine tailings, the alkaline chlorination process and the pressure filtration and dry heaping process are unstable in effect, the bearing capacity of a tailings pond is limited, and the bearing capacity is needed to be maintained and managed for a long time. The method comprises the following steps in sequence: adding an oxidant in the gold mine tailings; uniformly mixing the oxidant and the gold mine tailings; feeding the mixture into a bin; crushing and grinding lime and gypsum and then adding to the bin; feeding cement and water to the bin in sequence; uniformly stirring cement and water and then mixing with the gold mine tailings, the oxidant, lime, gypsum and cement, so as to obtain the mixture; digesting the mixture in a digesting bin for 2 to 3 hours; milling through wheels; transferring the milled mixture into a brick machine; pressing the milled mixture to obtain the brick blank; standing for 3 to 6 hours at normal temperature; maintaining in a steam pressing kettle in a steam pressing way for 5 to 10 hours at 170 to 200 DEG C under 0.8 to 1.5MPa; and cooling to room temperature, so as to obtain the steam-pressed brick product. According to the method, cyanide in the gold mine tailings is damaged, the resource utilization of the gold mine tailings is realized, and the environmental protection benefit and the economic benefit are achieved.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and disposal, in particular to a method for preparing autoclaved bricks from gold tailings. Background technique [0002] Gold production generally adopts cyanide gold extraction method, in which cyanide must be added, resulting in a certain amount of cyanide remaining in the tailings. Because gold tailings are mostly treated in the form of inventory, with the expansion of gold production scale and the extension of mining history, the accumulation of gold tailings has increased year by year, which not only occupies a large amount of land, pollutes the atmosphere, surface water and groundwater, but also many tailings pools are overdue. Or overload use, or even illegal operation, so that the tailings stockpile has great potential safety hazards. In addition, the construction and maintenance management of tailings ponds also need to invest a lot of money. Therefore, it is imminent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/12
CPCY02W30/91
Inventor 姚志通张素玲张春晓
Owner HANGZHOU DIANZI UNIV
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