Three clinoptilolite-based materials, having Pb²⁺/NH₄⁺ ratios of 1.60, 0.56 and 0.16, were prepared starting from a powder containing ≈90% of NH₄-clinoptilolite. The samples were submitted to a set of thermal treatments of 2 h up to 1000 °C. Further treatments were performed at 900 and 1000 °C for 4, 8, 16 and 32 h. (NH₄, Pb)-clinoptilolite underwent dehydration, de-ammoniation, and dehydroxylation, the latter accompanied by amorphization that occurred between 600 and 700 °C, whereas crystallization of new phases started at 800–900 °C. The products, obtained through solid state reactions, were: i) Pb-feldspar + cristobalite/tridymite + glass, when Pb²⁺/NH₄⁺ ≥ 0.16; ii) mullite + cristobalite/tridymite + glass, when 0 ≤ Pb²⁺/NH₄⁺ ≤ 1.60, hence both Pb-feldspar and mullite were obtained for 0.16 ≤ Pb²⁺/NH₄⁺ ≤ 1.60. XRD data showed that, for a given composition, temperature and duration of the heating influenced the quantity of the phases formed, but also the occupancy of Pb- and T-sites of Pb-feldspar. Crystalline products (amorphous 10–12%) were obtained from all samples. When Pb²⁺/NH₄⁺ ≥ 0.56, the highest amounts of Pb-feldspar and the lowest quantities of residual glass were recorded after 32 h at 900 °C, but a 2-h treatment at 1000 °C allowed to speed up the transformation, confining over 70% of lead within feldspar. The sample with Pb²⁺/NH₄⁺ = 0.16 required 32 h at 1000 °C to reduce glass at 10%, but most of the lead (≈70%) remained in the amorphous fraction.

从含≈90％NH _4-斜发沸石的粉末开始，制备三种Pb ²⁺ / NH ₄ ⁺比为1.60、0.56和0.16的斜发沸石基材料。样品经过2 h最高1000°C的热处理。在900和1000°C下进行了4、8、16和32小时的进一步处理。（NH ₄，Pb）-斜发沸石经历了脱水，脱氨和脱羟基作用，后者伴随着600至700°C的非晶化，而新​​相的结晶则始于800-900°C。通过固态反应获得的产物为：i）Pb ²⁺ / NH ₄ ⁺时，Pb长石+方石英/鳞石英+玻璃≥0.16; ⅱ）莫来石+方石英/鳞石英+玻璃，当0≤铅²⁺ / NH ₄ ⁺ ≤1.60，因此两者的Pb-长石和莫来石为0.16≤铅获得²⁺ / NH ₄ ⁺ ≤1.60。XRD数据表明，对于给定的组成，加热的温度和持续时间会影响所形成的相的数量，但也会影响Pb-长石的Pb-和T-位的占有率。从所有样品中均获得结晶产物（非晶态10–12％）。当Pb ²⁺ / NH ₄ ⁺≥0.56时，在900°C下放置32 h后，记录到的Pb长石含量最高，而残留玻璃量最低，但是在1000°C下进行2 h处理可以加速转化，将铅限制在70％以上在长石内。Pb ²⁺ / NH ₄ ⁺  = 0.16的样品在1000°C下需要32 h才能还原10％的玻璃，但是大多数铅（≈70％）保留在非晶态部分中。