Method and equipment for sorting and purifying pyrite residue

Abstract

The invention relates to a sorting method and a device for separating and purifying the sulfuric-acid residue. The technique is: manufacturing the pulp with the raw sulfuric-acid residue [17] in the agitated tank [16], selecting the pulp roughly in the separating-purifying-sorting device [15] , sending the finished ore to the separating-purifying-sorting device [14] to refine for the first time, then refining the finished ore again in the separating-purifying-sorting device [13], selecting the debris [9] of the device [15], [14], [13] collectively. The structure of the sulfuric-acid residue separating-purifying-sorting device is: connecting a separating ore apparatus [1] with a chute feeder [3], fixing them in the upper frame [2], connecting the upper frame [2] with the helical flute column [4], connecting the column [4] with the spiral chute [5], wherein the top of the spiral chute [5] is below the upper frame [2], the lower of the spiral chute [5] is connected with the cutting groove [6], the cutting groove [6] is connected with the receiving case [7], and inside the spiral chute [5] is fixed the transverse washing pipe [8].

Description

1. Technical field [0001] The invention belongs to sorting and purifying equipment for resource treatment. In particular, it relates to a device for sorting and purifying sulfuric acid slag. 2. Technical background [0002] Sulfuric acid slag is a waste residue produced during the production and preparation of sulfuric acid. Under normal conditions, 0.8-0.9 tons of sulfuric acid slag should be discharged for every 1 ton of sulfuric acid produced. Sulfuric acid slag is produced in a wide range of places, and the annual discharge is astonishing. In addition to the accumulated sulfuric acid slag that has not been treated in time, the total amount is quite considerable. The current situation of sulfuric acid slag is that, except some of it is used as an additive in cement plants, most of it is piled up as waste, which not only occupies land for a long time, wastes iron resources, but also causes environmental pollution, affects industrial and agricultural production, and endang...

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Problems solved by technology

[0004] One is due to problems such as complex production process, difficult process control, unstable product indicators, low utilization rate, and high operating cost. The processes used are:

[0005] Although the maglev combined process can obtain iron ore concentrate with a grade of 60.81% (Research on the Recycling and Utilization of Microfine Sulfuric Acid Slag, Ding Yunqing et al., Xinjiang Nonferrous Metals, 1997, No2), but due to insufficient surface activity of the roasted minerals, the floating The selection cannot be effectively sorted, and the effect is poor;

[0006] Although the sulfuric acid slag can be obtained with a grade of 58.90% sulfuric acid slag concentrate by magnetic separation-shaking table separation process (magnetic separation-shaking table separation process sulfuric acid slag treatment, Shi Ling et al., Mining Engineering, 2001, No3), it cannot be ruled out sulfur in concentrates;

[0007] Ore washing-grading-magnetic separation method can also obtain concentrate containing 58.25% iron (simple method to recover iron from pyrite slag, Liu Xinxing et al., Comprehensive Utilization of Mineral Resources, June 1999), but in addition to complex process In addition, it is impossible to effectively control the sulfur content in the concentrate;

[0008] Acid leaching-magnetic separation-flotation combined process for sorting can obtain iron concentrate with an iron grade of 59.75% (experimental research on the recovery of iron in sulfuric acid slag, Wang Xuesong et al., Comprehensive Utilization of Mineral Resources, January 1998), but the process is complicated , high processing cost;

[0009] The high-temperature chlorination process of sulfuric acid slag can obtain iron concentrate with an iron grade of 63.41% (Comprehensive Utilization of Sulfuric Acid Slag in Tongling, Chu Qianshen, etc., Journal of Hebei Institute of Technology, November 2003), but involves high-temperature thermal work, and the process is complicated , high processing cost

[0010] Second, there is no special equipment for sorting sulfuric acid slag

However, when the equipment is used for the separation of sulfuric acid slag, since the density difference between the target minerals and non-purpose minerals in the sulfuric acid slag is extremely small (usually between 0.1 and 0.2%), under this small density difference , when the ratio of the pitch h of the chute to the diameter D of the chute is 0.45 to 0.8, the conventional pitch-to-diameter ratio, the sulfuric acid slag cannot be effectively separated

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