Lead and zinc tailings brick

First, refractory bricks and red bricks

Hunan Shaodong lead zinc mineral flotation tailings using the branch recovered fluorite production process, a first support component main flotation tailings hydrocyclone overflow portion fractionated silica and aluminum oxide Its refractoriness is 1680 °C. Using the overflow product, a part of 2.362mm clay clinker and mud is added, and these materials are naturally air-dried after being kneaded and formed, dried at 80 ° C and 120 ° C, and then fired in a re-burning furnace to obtain The final product, its performance has been tested to meet the national blast furnace brick standard.

Part of the tailings produced in the flotation process for the recovery of fluorite are rich in silica and calcium fluoride.

If the return to the fluorite flotation circuit will affect the quality of the fluorite concentrate, it will be produced as part of a separate tailings. In order to make this part of the tailings properly used, a red brick test was carried out. The tailings and clay are mixed in a ratio of 3:2, and then dried (120 ° C, 4 h), fired (1000 ° C, 3 h) to obtain the finished product.

Second, autoclaved silicate brick

Jiangxi Copper companies under the chemical composition of lead-zinc tailings Hill silver relatively stable, the main _{components: SiO 2 58.52%, Al 2} O 3 11.42%, Fe 2 O 3 8.74%, CaO 0.23%, MgO 0.42%, burn The loss is 1.3%~1.5%, and the particle size composition is ideal. The particle size and occupancy rate are: +0.175mm, 18.50%, +0.124mm, 7.25%, +0.074mm, 17.00%, and +0.048mm, 10.50%. ―0.048mm accounts for 46.75%, which is suitable for the production of autoclaved silicate bricks. The production process is shown in Figure 1.

Figure 1 Production process of autoclaved silicate brick in Yinshan lead-zinc mine

Technical requirements for the process:

Proportion: 85% tailings, 15% lime;

Calcium oxide content: 65% or more;

Digestion temperature: 80 ° C or more;

Digestion time: 6h;

Steam pressure: 0.8MPa;

Steam temperature: 170 ° C or more.

The finished bricks produced are high in strength and beautiful in color. After testing, its compressive strength is 18～21MPa, the flexural strength is 3.7～5.5MPa, the antifreeze performance is good (17 freeze fusion grids), other physical properties are all, meet the requirements of use, the test result is the national standard 150 brick It is higher than ordinary clay bricks and can be widely used in general industrial and civil buildings.

At present, Yinshan Lead-Zinc Mine has built a tailings brick factory with a capacity of 10 million pieces. It can consume 30,000 tons of tailings per year, and the product quality is good, the customer is satisfied, the sales are wide, the estimated annual output value is 1.6 million yuan, and the profit and tax is 170,000. yuan.